Iron&#;carbon microelectrolysis was employed to remove phosphorus in this study. The efficiency, mechanism, influence factors, and feasibility of actual wastewater were investigated. The results showed that iron&#;carbon microelectrolysis had an excellent phosphorus removal ability. When the initial concentration of PO 4 3 &#; &#;P was 19.44 mg·L &#;1 , after 120 min reaction time, the remaining PO 4 3 &#; &#;P in wastewater was 4.65 mg·L &#;1 , and the removal rate was 76.05%. The precipitate formed in the reaction was mainly ferric phosphate (FePO 4 ), which had a high recovery value. There was a linear correlation between initial phosphorus concentrations and phosphorus removal velocity. As to actual wastewater, 88.37 ± 0.44%, 89.78 ± 1.88%, and 94.23 ± 0.16% phosphorus removal rates were achieved in the influent of municipal wastewater treatment plant, effluent of secondary sedimentation tank, and actual high salinity wastewater, respectively, after 120 min reaction time. This study provides a new method for phosphorus removal and recovery from wastewater.
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Natural water body eutrophication is caused by wastewater discharge that contains nitrogen (N) and phosphorus (P) [1,2], while P is considered a limiting factor of eutrophication because most lakes are P limitation [3,4]. It is generally considered that eutrophication occurs when the total nitrogen and total phosphorus (TP) in water are more than 0.2 and 0.02&#;mg·L&#;1, respectively [5]. On the other hand, P is a necessary nutriment for the development of life, constituting one of the major nutrients vital for agriculture [6]. However, the quantities of mineral P resources (phosphate rock) are decreasing in the world, making P recovery necessary to solve the P shortage [6,7]. Therefore, many research studies are now focusing increasingly on P recovery from wastewater.
P Recovery is a feasible and valuable technique which is suited to high-strength wastewater such as anaerobic sludge digestion and high P industry wastewater [8,9]. P is easily removed by chemical precipitation. Insoluble calcium, magnesium, and iron phosphates can be formed by pH control and chemical dosing, which precipitate at the bottom of specific reactors [10,11]. However, chemical dosing means the operation cost and is not an environmentally friendly approach. Ferrous iron (Fe2+) and ferric iron (Fe3+) can react with phosphate to form insoluble phosphate precipitation. In recent years, iron has been developed as a promising cost-effective chemical dosage considering both its high P removal efficiency and low commercial price [12,13,14]. Zhang et al. reported an application of in situ electrochemical generation of ferrous (Fe(ii)) ions for phosphorus (P) removal in wastewater treatment; at concentrations typical of municipal wastewater, P could be removed by in situ Fe(ii) with removal efficiency higher than achieved on the addition of FeSO4 and close to that of FeCl3 under both anoxic and oxic conditions [15]. But an electric field should be applied for in situ Fe2+ generation with direct current, which meant energy consumption.
Because of the advantages of treating waste with waste, the phosphorus removal technology of inorganic phosphorus removal filler (represented by fly ash ceramsite, water supply sludge ceramsite, calcium-silica filter material, and so on) has developed rapidly [16,17]. Among these inorganic fillers, the iron&#;carbon (Fe&#;C) micro-electrolysis method is to treat wastewater by forming a galvanic cell reaction in the electrolyte solution through the mixture of iron chips and coke or iron&#;carbon composite materials under the condition of no electricity. The removal of pollutants is completed by the primary cell reaction, flocculation precipitation, oxidation&#;reduction, electrochemical enrichment, physical adsorption, and other processes [18,19]. The research studies of Fe&#;C microelectrolysis technology mostly focus on the improvement of the biodegradability of refractory organic wastewater and the treatment efficiency of some industrial wastewater as a pretreatment unit combined with biochemical treatment process [18,19], ignoring the research of phosphorus removal of iron&#;carbon micro-electrolysis. In this study, iron filings acquired from a machine processing factory were used as the chemical dosage combined with activated carbon to achieve efficient P recovery via iron&#;carbon (Fe&#;C) microelectrolysis in situ. The mechanism, recovery efficiency, and feasibility of actual wastewater were investigated, providing an environmental and sustainable way for P removal and recovery.
The efficiency of Fe&#;C microelectrolysis on P removal from synthetic wastewater is shown in Figure 1. The initial concentration of PO 4 3 &#; &#;P was 19.44&#;mg·L&#;1, then wastewater, and Fe&#;C fillings were contacted for reaction under agitation. The concentration of PO 4 3 &#; &#;P decreased slowly at the beginning period and then rapidly after 30&#;min. After 120&#;min reaction time, the remaining PO 4 3 &#; &#;P in wastewater was 4.65&#;mg·L&#;1, while the removal rate was 76.05%, and the average reaction rate was 0.12&#;mg·L&#;1·min&#;1. The results showed that Fe&#;C microelectrolysis had good P removal ability. Li et al. used electrocoagulation&#;ultrasound combined technology for P removal, TP decreased from 86.00 to about 0.40&#;mg·L&#;1, and the removal rate reached about 99.60% [20]. Using Fe&#;C microelectrolysis to remove P was based on a galvanic cell reaction, without an external power supply. Moreover, iron filings and activated carbon could be acquired from industrial waste, which were environmentally friendly and good for waste reuse.
Figure 1
Fe&#;C microelectrolysis was a common galvanic cell reaction and was explicated for many years [21,22,23]. Fe was the anode, and the reaction was:
(1)
Fe &#; 2 e &#; &#; Fe 2 + E θ ( Fe 2 + / Fe ) = 0.44 ( V )
(2)
Fe 2 + &#; e &#; &#; Fe 3 + E θ ( Fe 3 + / Fe 2 + ) = 0.77 ( V )
C was the cathode, and the reaction was:
(3)
2H + + 2 e &#; &#; 2 [ H ] &#; H 2 E θ ( H + / H 2 ) = 0.00 ( V ) ( acidic condition )
(4)
O 2 + 2 H 2 O + 4 e &#; &#; 4 OH &#; E θ ( O 2 / OH &#; ) = 0.40 ( V ) ( neutral/alkaline condition )
(5)
4H + + O 2 + 4 e &#; &#; 2 H 2 O 2 E θ ( H + / H 2 O 2 ) = 1.23 ( V ) ( acidic, oxygen-rich condition )
Because the above reactions were simultaneous, Fe2+ from Eq. 1 and H2O2 from Eq. 5 could react as:
(6)
Fe 2 + + H 2 O 2 &#; Fe 3 + + &#; OH + OH &#;
It was Fenton's reaction. Moreover, the products from the above reactions, such as ˙OH, [H], Fe2+, Fe3+, could react with many pollutants in wastewater [24,25]. Galvanic cell reaction, flocculation&#;sedimentation, oxidation&#;reduction, electrochemical enrichment, and physical adsorption were the micro-process which was with high efficiency and wide application in water treatment.
As to P removal, Fe2+, Fe3+ could react with phosphate to form ferrous phosphate (Fe3(PO4)2·8H2O) and ferric phosphate (FePO4), respectively (as shown in Figure 2) [25,26]. In order to determine the main product from Fe&#;C microelectrolysis, X-ray diffraction analysis was employed to detect the precipitate formed after the reaction, and the diffractogram is presented in Figure 3. A number of distinct rays indicate the presence of crystalline forms. By comparison with reference spectra, most of the peaks, and in particular the bigger ones, coincided with those of ferric phosphate (FePO4).
Figure 2
Figure 3
The above reaction provided a new way of P removal and recovery way for high P wastewater. Through Fe&#;C microelectrolysis pretreatment, not only could the biodegradability of raw water be improved, but also P could be removed, reducing the N and P simultaneous removal pressure of subsequent biochemical treatment units. Moreover, the contradiction of N and P simultaneous removal in low C/N ratio wastewater could be relieved [27,28].
The product, FePO4, was a raw material to make lithium iron phosphate batteries, catalysts, and ceramics, and had a high recovery value. Nowadays, one of the most important uses of FePO4 was to make lithium iron phosphate batteries [29,30]. With the rapid development of the electric vehicle industry, China became the largest consumer market of lithium iron phosphate in the world. Especially from to , the sales volume of lithium iron phosphate in China was about 5,797 tons, accounting for more than 50% of global sales. Therefore, FePO4, the precipitate of P removal by Fe&#;C microelectrolysis, had a high recycling value.
The initial PO 4 3 &#; &#;P concentrations were different, but the residual PO 4 3 &#; &#;P change curves were similar (as shown in Figure 4). All of them decreased rapidly at first and then slowly. The higher the initial PO 4 3 &#; &#;P concentration, the higher the P removal velocity. And there was a linear correlation (R 2 = 0.). In this concentration range, the Fe&#;C microelectrolysis P removal was the first-order reaction.
Figure 4
Salinity was one of the common pollutants in industrial wastewater and also one of the limiting factors in industrial wastewater treatment [31,32]. When the initial PO 4 3 &#; &#;P concentration was 40&#;mg·L&#;1, the influence of salinity (NaCl was added to the synthetic wastewater) on the phosphorus removal by Fe&#;C microelectronics is shown in Figure 5. The higher the salinity, the slower PO 4 3 &#; &#;P the decrement rate, which indicated that the salinity inhibited the P removal by Fe&#;C microelectrolysis significantly. Therefore, the influence of salinity needed be considered in the application of this technology.
Figure 5
The influence of salinity on P removal velocity is shown in Figure 5. In the range of 0&#;10&#;g·L&#;1 salinity, the reaction rate decreased rapidly with the increment of salinity. When the salinity was 10&#;g·L&#;1, the reaction rate was 0.20&#;mg·L&#;1·min&#;1, and only 51.28% of that when the salinity was 0&#;g·L&#;1. The reaction rate was 0.14&#;mg·L&#;1·min&#;1, when the salinity was 25.00&#;g·L&#;1, which was 70.00% of the reaction rate when the salinity was 10.00&#;g·L&#;1. The fitting curve showed that the P removal velocity by Fe&#;C microelectrolysis decreased exponentially under the influence of salinity (R 2 = 0.). The results showed that the salinity had an obvious inhibition on P removal by Fe&#;C microelectrolysis, and the salinity range of wastewater suitable for P removal by Fe&#;C microelectrolysis was 0&#;10&#;g·L&#;1.
In order to verify the feasibility of P removal from actual wastewater, the influent of WWTP, effluent of SST, and actual high salinity wastewater were treated by Fe&#;C microelectrolysis. The results are shown in Figure 6. It can be seen that the phosphorus removal rate of Fe&#;C microelectrolysis for these three types of wastewaters is relatively high and stable, and the removal rate is 88.37 ± 0.44%, 89.78 ± 1.88%, and 94.23 ± 0.16%, respectively (water samples were taken every other day, and the average value of the three experiments). Even if the salinity of raw water was greater than 20.00&#;g·L&#;1, the Fe&#;C microelectrolysis process showed excellent TP removal capacity. The results indicated that Fe&#;C microelectrolysis also had a good P removal effect on the actual industrial wastewater, so it was worth further research and promotion. There was no aeration and denitrification in the reaction process, so NH 4 + &#;N in raw water was unchanged. But the removal of TP from wastewater required no organic carbon and left the organic carbon to biological nitrogen removal, which was a promising way for low COD/N ratio wastewater treatment.
Figure 6
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P Removal by microelectrolysis was achieved in this study and might be a new way to P recovery; 76.05% removal rate was achieved under the initial concentration of PO 4 3 &#; &#;P was 19.44&#;mg·L&#;1 and 120&#;min reaction time in synthetic wastewater. The precipitate formed in the reaction was mainly ferric phosphate (FePO4) which had a high recovery value. There was a linear correlation between initial P concentrations and P removal velocity. The salinity had an obvious inhibition on P removal by Fe&#;C microelectrolysis while P removal velocity decreased exponentially. As to actual wastewater, 88.37 ± 0.44%, 89.78 ± 1.88%, and 94.23 ± 0.16% phosphorus removal rate were achieved in the influent of WWTP, effluent of SST, and actual high salinity wastewater, respectively, after 120&#;min reaction time.
Activated carbon (AR), bought from Tianjin Fuchen Chemical Reagent Factory (Tianjin, China), was washed with deionized water, dried at 105&#;, and cooled for standby. Iron filings, acquired from Linyi Taiping Machine Processing Factory (Linyi Shandong, China), were soaked in 1&#;mol·L&#;1 NaOH solution for 5&#;min to remove the dirt on the surface and then washed to neutral with deionized water, then soaked in 1% hydrochloric acid for 5&#;min to remove the oxide film on the surface, and finally washed to neutral with deionized water for immediate using.
Synthetic P-containing wastewater was prepared by adding K2HPO4 to tap water. The mechanism, efficiency, and influencing factors of P recovery were studied with synthetic wastewater. The feasibility of P removal from actual wastewater was investigated by using the influent of municipal wastewater treatment plant (WWTP) and the effluent of secondary sedimentation tank (SST). The influent of WWTP and the effluent of SST were collected from the water inlet and the SST outlet in a municipal wastewater treatment plant in Zaozhuang City (Zaozhuang Shandong, China). High salinity wastewater (high COD and >20.00&#;g·L&#;1 salinity (NaCl) on average) was collected from a pickle factory in Lanling County, Linyi City (Linyi Shandong, China).
Into a 250&#;mL flask, 100&#;mL&#;P containing wastewater was put. The flask was placed on a magnetic stirrer at room temperature (20 ± 0.5&#;, 200&#;rpm). Added prepared iron&#;carbon filings to the flask according to test requirements. After the reaction, the filtrate was filtered to measure P concentration.
Samples of the solution were taken at fixed times according to the experiment plan with one of these samples filtered immediately through a membrane with 0.45&#;μm pore size. Analysis of the filtrate was conducted immediately. The concentrations of chemical oxygen demand (COD), ammonia nitrogen, and TP were determined according to the standard method [33].
The membrane containing residual insoluble was dried in a lyophilizer (XY-FD-S40, Shanghai, China) to prevent oxidation of the Fe(ii) species as much as possible and the dry solid substances present analyzed by X-ray diffraction (XRD) (XRD-, Shimadzu, Japan). Jade 6.0 software was used to analyze the data and determine the chemical structure of the precipitate [34].
Technical field
The present invention relates generally to a kind of method of iron charcoal micro-electrolysis stuffing, relates in particular to a kind of method of utilizing non-ferrous metal abandoned mine slag to produce iron charcoal micro-electrolysis stuffing.
Background technology
Low-cost, implement high density, highly difficult waste water treatment process and technology expeditiously, be not only the active demand that environment-friendly engineering is used, the current whole society active demand that solves water environment pollution especially.Recent study finds, utilizes iron, carbon as the main raw material of galvanic cell, reduction, the decolouring of organic pollutant had splendid effect, as heavy metal, dyeing waste water etc.Especially inexpensive oxygenant H on the ferrous ion that exists in the water after utilizing iron-carbon micro-electrolysis to handle and the market 2O 2The FENTON reagent of combination has the oxidation characteristic that organic pollutant is not had selective oxidation, gains great popularity in environment-friendly engineering is used.Therefore, the demand to iron-carbon micro-electrolysis filler presents geometric growth trend on the environmental protection market.At present, domestic iron-carbon micro-electrolysis filler producing and selling market is flourish, and owing to reasons such as market and raw materials, the manufacturing enterprise of this product mainly is distributed in Shandong coastal waters and area, Yixing, Jiangsu, and the gross output value is about more than 1,000,000,000 yuan.Each enterprise's starting material employing and preparation technology's homogeneity makes products characteristics be in low starting point, single variety, and the scope of application waits further exploitation.But because it has advantages such as low cost, multi-usage, technology cooperation convenience.Be fast rise situation during this segments market at environment-friendly filler.Iron-carbon micro-electrolysis filler is the rapid wear running stores, and sewage work's (station) need constantly replenish according to the situation of loss, and sizable stock market is not only arranged.Along with country puts more effort to water pollution control, to adopt new technology in the highly difficult wastewater treatment, the expansion of new filtrate, the market outlook of the iron-carbon micro-electrolysis filler of high performance-price ratio are become better and better.Have and close the authoritative department prediction, before the year two thousand twenty, with quadrupling the gross annual value of China's industrial and agricultural production in the two decades, the market sales revenue will reach 40 hundred million to the annual requirement of iron-carbon micro-electrolysis in China.What is more important, along with the raising of green technology and the employing of high performance-price ratio novel process, on the basis of iron-carbon micro-electrolysis filler production technology, the biochemical bacterium technology of little electrolysis load, the desulfurization of micro-electrolysis stuffing supported catalyst, micro-electrolysis stuffing supported catalyst dechlorination technology constantly perfect, to bring more vast market to micro-electrolysis stuffing market, must be accompanied by more business opportunity.
Tongling Nonferrous Metal Group Co., Ltd is that a tame centralized procurement choosing, smelting, processing, trade are the comprehensive copper manufacturing enterprise of one.Under copper metallurgy enterprise project annually produce about 2,000,000 tons of copper slags, the iron-holder of this copper waste residue surpasses 30%.These waste residues can only be used as cheap cement ingredient use at present, and a large amount of iron resourcess is wasted, and value per ton has only about 100 yuan.In order to realize taking full advantage of of melting waste slag, copper hat under the coloured house flag in Tongling likes that the company of opening and Hefei worker are big, the just clear Environmental Protection Technology Co., Ltd in Hefei cooperates, gropes through long term studies, has developed " copper is smelted the iron-carbon micro-electrolysis filler reparation technology of abandoned mine slag " technology.Utilize this technology to refine the impurity iron of (content is about 35%) in the former copper scrap slag, mix with cheap brown coal on the market again, adopt go out distinctive pore-creating and sintering process newly developed, make it to become the iron-carbon micro-electrolysis filler that meets environmental protection water treatment needs.Prepare the discarded smelting abandoned mine slag of starting material utilization of this product, turn waste into wealth.The result of use that under the prerequisite of control products production cost, has kept early stage old product, simultaneously, owing to adopt non-ferrous metal abandoned mine slag to substitute the scrap iron slag.By the preparation production technique that goes out newly developed, modification changes the physics-chem characteristic of the trace heavy metal element that contains in the copper melting waste slag, make it that bigger specific surface area and catalytic performance more efficiently be arranged, improved the decomposition voltage of galvanic cell, enlarge the scope of application of sewage disposal, improved treatment effect.
Summary of the invention
The object of the invention just provides a kind of method of utilizing non-ferrous metal abandoned mine slag to produce iron charcoal micro-electrolysis stuffing.
The present invention is achieved by the following technical solutions:
A kind of method of utilizing non-ferrous metal abandoned mine slag to produce iron charcoal micro-electrolysis stuffing may further comprise the steps:
(1) is copper mine slag and the brown coal mixing of 1:1 with weight ratio, grinds, cross the 100-120 mesh sieve;
(2) impurity superfine silicon dioxide powder is removed in the magnetic separation;
(3) add binding agent yellow starch gum, catalyst metal powder, pore-forming material carboxymethyl cellulose, incendiary material aluminium powder mixing and stirring, the consumption of described binding agent is that the 2-3 &#; of copper mine slag and brown coal weight, described catalyst metal powder are the mixture of copper powder, lead powder and platinum powder, consumption is the 5-6 &#; of copper mine slag and brown coal weight, and wherein the weight ratio of copper powder, lead powder and platinum powder is 5-6:1-2:0.2-0.3; The consumption of described pore-forming material carboxymethyl cellulose is the 1-2 &#; of copper mine slag and brown coal weight, and the consumption of described incendiary material aluminium powder is the 3-4 &#; of copper mine slag and brown coal weight;
(4) inject squeeze film and cut into garden column blank into strips;
(5) drying: raise temperature gradually to 75-85 &#; with 3-5 &#;/minute speed, under this temperature, carry out the thermal convection drying treatment;
(6) idiosome heating:
Low thermophase: temperature is raised to 190-290 &#; from room temperature, and heat-up rate is 8-10 &#;/minute;
From spreading the stage: the reaction that internal system takes place comprises oxygenolysis stage, hot stage, holding stage, finally reaches - &#;;
(7) compression molding: with the above-mentioned micro-electrolysis stuffing that is in - &#;, pour in the pressing mold of pair roller type briquetting press, adopt cooling fast, make mold clearing temperature drop to 680-700 &#;, between 700--400 &#;, slowly lower the temperature naturally with air, the mode of cooling off of taking below 400 &#; to spray water is cooled off, and the iron-carbon micro-electrolysis filler behind the cooling forming is described finished product.
A kind of method of utilizing non-ferrous metal abandoned mine slag to produce iron charcoal micro-electrolysis stuffing, the content that it is characterized in that Zero-valent Iron in the described copper mine slag is 35-45%.
A kind of method of utilizing non-ferrous metal abandoned mine slag to produce iron charcoal micro-electrolysis stuffing, it is characterized in that step (6) is described from described oxygenolysis stage of spreading in the stage is: this stage is from 190-220 &#;, oxidation, the decomposition of each component take place, and crystal transition, take off the crystal water process; When particularly this phase temperature was raised to nearly 300 &#;, brown coal took fire, and caused the burning of incendiary material aluminium, and temperature rises very fast; Described hot stage is: this stage, can produce liquid phase suddenly, and cause a large amount of defectives of the inner generation of filler if the temperature rising is too fast because the aluminium burning discharges a large amount of heats, and it is very fast to cause temperature to rise; So must control the slow rising of temperature; Described holding stage is: this stage principal character be temperature rise to the molten back that is higher than cementite (metallic compound of iron and carbon formation, its chemical formula is Fe3C; The carbon content of cementite is ω c=6.69%, and fusing point is &#;), its temperature remains unchanged for some time substantially.
Advantage of the present invention is:
Iron-carbon micro-electrolysis filler of the present invention mainly is to utilize Zero-valent Iron, Iron sulfuret, brown coal in the copper ashes to be main raw material, merge pore-forming material, binding agent, catalyzer and also adopt high temperature micropore activating technology to produce, have that iron carbon is integrated, fusion catalyzer, micropore framework formula alloy structure, specific surface area are big, light specific gravity, active strong, current density is big, be used for all kinds of sewage treating efficiency height etc. characteristics.In Industrial Wastewater Treatment, no matter be solely to use as the pretreatment technology in the environment-friendly engineering or as little electrolysis material list, all can efficiently remove COD, reduction colourity, the biodegradability that improves in all kinds of sewage, the operation result of use is stable.The high reactivity of non-ferrous metals such as the Cu that contains in the product innovation has changed filler passivation in the old product operational process, phenomenon such as harden, and has guaranteed that the micro-electrolysis reaction process continuous action cycle is longer.
1, in operational process, not passivation, do not harden, treatment effect is stable.Technical process is simple, investment cost is few, running cost is low.
2, active strong, specific surface area is big, speed of reaction is fast, and commonly industrial wastewater only needs 30-60 minute, and long-time running is effectively stable.
3, the effect organic pollution materials is applied widely, as: contain the difficulty of even fluorine, the two keys of carbon, nitro, halogeno-group structure except degradation of organic substances matter; Can effectively remove wastewater toxicity, significantly improve the biochemical treatment ability.
4, only consume a spot of fine electrolyser in long service life, the treating processes.
5, form the ferrous or iron ion of ecosystem in the product use, have than the effect of common coagulants better coagulation.
6, this method can reach the effect of chemical precipitation dephosphorization, can also remove heavy metal by reduction;
7, catalysis and micro-electrolysis technology not only can compatible existing sewage (trade effluent) treatment process, also has obvious role in synergism.
Description of drawings
Fig. 1 is iron-carbon micro-electrolysis filler sample drawing of the present invention.
Embodiment
Embodiment 1
A kind of method of utilizing non-ferrous metal abandoned mine slag to produce iron charcoal micro-electrolysis stuffing may further comprise the steps:
(1) is copper mine slag and the brown coal mixing of 1:1 with weight ratio, grinds, cross 120 mesh sieves;
(2) impurity superfine silicon dioxide powder is removed in the magnetic separation;
(3) add binding agent yellow starch gum, catalyst metal powder, pore-forming material carboxymethyl cellulose, incendiary material aluminium powder mixing and stirring, the consumption of described binding agent be copper mine slag and brown coal weight 3 &#;, described catalyst metal powder is the mixture of copper powder, lead powder and platinum powder, consumption is 6 &#; of copper mine slag and brown coal weight, and wherein the weight ratio of copper powder, lead powder and platinum powder is 6:2:0.3; The consumption of described pore-forming material carboxymethyl cellulose is 1 &#; of copper mine slag and brown coal weight, and the consumption of described incendiary material aluminium powder is 3 &#; of copper mine slag and brown coal weight;
(4) inject squeeze film and cut into garden column blank into strips;
(5) drying: with raise gradually temperature to 85 &#; of 5 &#;/minute speed, under this temperature, carry out the thermal convection drying treatment;
(6) idiosome heating:
Low thermophase: temperature is raised to 290 &#; from room temperature, and heat-up rate is 10 &#;/minute;
From spreading the stage: the reaction that internal system takes place comprises oxygenolysis stage, hot stage, holding stage, finally reaches &#;;
(7) compression molding: with the above-mentioned micro-electrolysis stuffing that is in &#;, pour in the pressing mold of pair roller type briquetting press, adopt cooling fast, make mold clearing temperature drop to 700 &#;, between 400 &#;, slowly lower the temperature naturally with air, the mode of cooling off of taking below 400 &#; to spray water is cooled off, and the iron-carbon micro-electrolysis filler behind the cooling forming is described finished product.
A kind of method of utilizing non-ferrous metal abandoned mine slag to produce iron charcoal micro-electrolysis stuffing, the content of Zero-valent Iron is 35-45% in the described copper mine slag.
A kind of method of utilizing non-ferrous metal abandoned mine slag to produce iron charcoal micro-electrolysis stuffing, step (6) is described from the described oxygenolysis stage of spreading in the stage to be: this stage is from 190-220 &#;, oxidation, the decomposition of each component take place, and crystal transition, take off the crystal water process; When particularly this phase temperature was raised to nearly 300 &#;, brown coal took fire, and caused the burning of incendiary material aluminium, and temperature rises very fast; Described hot stage is: this stage, can produce liquid phase suddenly, and cause a large amount of defectives of the inner generation of filler if the temperature rising is too fast because the aluminium burning discharges a large amount of heats, and it is very fast to cause temperature to rise; So must control the slow rising of temperature; Described holding stage is: this stage principal character be temperature rise to the molten back that is higher than cementite (metallic compound of iron and carbon formation, its chemical formula is Fe3C; The carbon content of cementite is ω c=6.69%, and fusing point is &#;), its temperature remains unchanged for some time substantially.
Performance index:
(1) product has higher catalytic: its leading indicator effect is embodied in the COD clearance; Dechlorination rate; Desulfurization degree; Be compared as follows with existing industry:
Technology The COD clearance Dechlorination rate Desulfurization degree Existing technology About 50% Below 30% 0 Novel process More than 70% More than 80% More than 60%That (2) adopts contrasts from epidemic techniques and conventional sintering method leading indicator:
(3) comparison of physicals
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