CN111777224A - Method for comprehensively utilizing multi-metal acidic wastewater of nonferrous metal mine - Google Patents
Method for comprehensively utilizing multi-metal acidic wastewater of nonferrous metal mine Download PDFInfo
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- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Abstract
The invention discloses a method for comprehensively utilizing multi-metal acidic wastewater of a non-ferrous metal mine, which realizes the recovery of sulfate radicals in the acidic wastewater and the production of calcium sulfate whiskers by controlling the acidity of a solution through neutralization so as to realize the high-valued product; the ferric hydroxide and the gypsum generated in the neutralization process are efficiently separated in a physical mode to obtain ferric hydroxide slag and a gypsum product, so that the reduction of the neutralization slag is realized, and the high-value utilization is realized; the copper, zinc and aluminum products are selectively separated and recovered by adopting a step precipitation method, the recovery rates of the copper, the zinc and the aluminum are respectively more than or equal to 90 percent, more than or equal to 95 percent and more than or equal to 85 percent, the resource utilization of valuable metals is realized, and the problems of resource waste and secondary environmental pollution in the stacking of the neutralization slag in the traditional neutralization process are solved.
Description
Technical Field
The invention relates to the technical field of reducing pollution and improving comprehensive utilization of wastewater resources, in particular to a method for comprehensively utilizing polymetallic acid wastewater of a nonferrous metal mine.
Background
The low-grade nonferrous metal mine usually adopts sulfuric acid/bioleaching-extraction-electrodeposition to extract valuable metals in ores, a large amount of metal ions such as copper, iron, aluminum, zinc, cobalt, nickel and the like enter acidic wastewater in a leaching and extraction section, the content of sulfuric acid in the acidic wastewater reaches 5-15g/L, and the content of iron in the acidic wastewater reaches 7-15 g/L. The acidic mine wastewater has the characteristics of high acidity, various heavy metals, complex properties, and the like, is harmful to the environment, and can be further utilized or discharged after being treated.
At present, common methods for treating copper-containing acidic wastewater of non-ferrous metal mines include an iron powder displacement method, a membrane treatment technology, a solvent extraction method, an ion exchange method, a chemical precipitation method, an oxidation-reduction method and the like. The iron powder replacement technology can be used for efficiently recovering copper in raffinate, but the problems of iron powder passivation, low utilization rate and the like exist, the generated iron-containing wastewater needs to be treated by an alkali neutralization process, and the reduction and resource utilization of slag cannot be realized. The membrane treatment technology can be used for treating low-concentration acidic wastewater, but has the problems of high requirement on water inlet index and further treatment of concentrated water. The resin selective adsorption method is suitable for treating low-concentration copper-containing acidic wastewater. The wastewater treated by the solvent extraction method often cannot reach the discharge standard and needs to be deeply treated. In the traditional process, the neutralization treatment of limestone and lime is widely applied due to low cost, but the process causes economic loss because heavy metal ions are not recycled in the neutralization process, the neutralized slag has high water content and contains a large amount of heavy metals, secondary pollution is caused by direct stockpiling in a mine, and the large amount of neutralized slag is stockpiled by adopting a special warehouse, so that the waste of precious land resources is caused while the production cost is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for comprehensively utilizing the polymetallic acid wastewater of the nonferrous metal mine.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for comprehensively utilizing multi-metal acidic wastewater of a nonferrous metal mine specifically comprises the following steps:
s1, preparing calcium sulfate whiskers by reducing acid:
adding calcium carbonate into the acidic wastewater for deacidification, and generating a polymetallic acidic solution A containing copper, iron, zinc and aluminum and gypsum slurry after thickening; pumping gypsum slurry into a reaction kettle for crystal transformation reaction, wherein the mass ratio of the gypsum slurry to water is 1: 7-35 adding water into the reaction kettle, adding a crystal transformation agent, reacting for 60-180min under the process conditions that the reaction temperature is 90-140 ℃, the stirring speed is 150-; the addition amount of the crystal transformation agent is 0.02 wt% -5 wt% of the mass of the gypsum slurry;
s2, neutralizing and depositing iron and producing gypsum:
adding a neutralizing agent into the polymetallic acid solution A obtained in the step S1 for neutralization, adding a separating agent after the neutralization reaction is finished, and controlling the end-point pH to be 3.0-3.6; performing sedimentation and thickening, and performing solid-liquid separation to generate ferric hydroxide precipitate, gypsum and a multi-metal acid solution B containing copper, zinc and aluminum, wherein the addition amount of the separating agent is 0.02-0.8 wt% of the mass of the multi-metal acid solution A;
s3, carrying out step recovery on the polymetallic acid solution B obtained in the step S2 to obtain copper and zinc:
adding sodium sulfide with the mass ratio of 0.8-1.2:1 to the copper ions into the polymetallic acid solution B for copper sulfide precipitation, and carrying out solid-liquid separation to obtain copper sulfide slag and an acid solution containing zinc and aluminum; adding sodium sulfide with the mass ratio of zinc ions to zinc ions of 0.9:1-1.4:1 into an acidic solution containing zinc and aluminum to perform zinc sulfide precipitation, performing solid-liquid separation to obtain zinc sulfide slag and an acidic solution containing aluminum, and controlling the end-point pH to be 3.7-4.0;
s4, precipitating and recovering aluminum: adding a precipitator into the acidic solution containing aluminum obtained in the step S3 to recover aluminum, adjusting the pH to 7.0-8.5, and performing solid-liquid separation to obtain high-aluminum slag and filtrate.
Further, in step S1, the crystallization agent includes one or more of sodium nitrate, sodium chloride, sodium sulfate, magnesium nitrate, magnesium chloride, and sodium citrate.
Further, in step S2, the neutralizing agent includes one or more of calcium carbonate, calcium oxide, sodium carbonate, magnesium carbonate, and magnesium oxide.
Further, in step S2, the separating agent includes one or more of sodium citrate, dodecylamine, sodium dodecylsulfonate, sodium dodecylsulfate, sodium dodecylbenzene sulfonate, and sodium lignosulfonate.
Further, in step S4, the precipitating agent includes one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, and ammonia water.
The invention has the beneficial effects that:
(1) the method realizes the recovery of sulfate radical in the acid wastewater and the production of calcium sulfate whisker by controlling the acidity of the solution through neutralization, thereby realizing the high-valued product.
(2) The method of the invention effectively separates the ferric hydroxide and the gypsum generated in the neutralization process by a physical mode to obtain the ferric hydroxide slag and the gypsum product, thereby realizing the reduction of the neutralization slag and realizing the high-value utilization.
(3) The method selectively separates and recovers the copper, zinc and aluminum products by adopting a step precipitation method, the recovery rates of the copper, the zinc and the aluminum are respectively more than or equal to 90 percent, more than or equal to 95 percent and more than or equal to 85 percent, the resource utilization of valuable metals is realized, and the problems of resource waste and secondary environmental pollution in the stacking of the neutralization slag in the traditional neutralization process are solved.
(4) The method has simple process, can produce various products, has low treatment cost and can meet the requirement of industrial production. Compared with the traditional neutralization process, the method realizes the separation and recovery of valuable elements in the acidic wastewater by methods such as precise neutralization and step selective precipitation recovery, and the total slag reduction is more than or equal to 90 percent. Provides a new treatment scheme for the resource utilization of the acid wastewater of the nonferrous metal mine, and has wide application prospect.
Drawings
FIG. 1 is a flowchart of a method of example 1 of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
Example 1
The embodiment provides a method for comprehensively utilizing multi-metal acidic wastewater of a nonferrous metal mine, which specifically comprises the following steps as shown in fig. 1:
s1, preparing calcium sulfate whiskers by reducing acid:
adding calcium carbonate into the acidic wastewater for deacidification, and generating a polymetallic acidic solution A (filtrate) containing copper, iron, zinc and aluminum and gypsum slurry (filter residue) after thickening; the addition amount of calcium carbonate is 0.8-1.2 times of the theoretical dosage of acid neutralization; pumping gypsum slurry into a reaction kettle for crystal transformation reaction, wherein the mass ratio of the gypsum slurry to water is 1: 7-35, adding water and a crystal modifier into the reaction kettle, reacting for 60-180min under the process conditions that the reaction temperature is 90-140 ℃, the stirring speed is 150-180rpm, then carrying out flash evaporation and separation, and drying to obtain a calcium sulfate whisker product; the addition amount of the crystal transformation agent is 0.02 wt% -5 wt% of the total mass of the gypsum slurry.
The crystal transformation agent comprises one or more of sodium nitrate, sodium chloride, sodium sulfate, magnesium nitrate, magnesium chloride and sodium citrate.
S2, neutralizing and precipitating iron, and co-producing gypsum:
adding a neutralizing agent into the polymetallic acid solution A obtained in the step S1 for neutralization, adding a separating agent after the neutralization reaction is finished, and controlling the end-point pH to be 3.0-3.6; settling, thickening and carrying out solid-liquid separation to obtain ferric hydroxide precipitate, gypsum and a polymetallic acid solution B (filtrate) containing copper, zinc and aluminum; the obtained ferric hydroxide product can be used as a pigment, and the gypsum product can be used as a cement retarder in building materials;
the neutralizing agent comprises one or more of calcium carbonate, calcium oxide, sodium carbonate, magnesium carbonate and magnesium oxide, and the addition amount is 0.6-0.9 times of the theoretical dosage of neutralization; the separating agent comprises one or more of sodium citrate, dodecylamine, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and sodium lignin sulfonate, and the addition amount of the separating agent is 0.02-0.8 wt% of the mass of the multi-metal acidic solution A.
S3, carrying out step recovery on the polymetallic acid solution B obtained in the step S2 to obtain copper and zinc:
adding sodium sulfide with the mass ratio of 0.8-1.2:1 to the copper ions into the polymetallic acid solution B for copper sulfide precipitation, and carrying out solid-liquid separation to obtain copper sulfide slag and an acid solution containing zinc and aluminum; adding sodium sulfide with the mass ratio of zinc ions to zinc ions of 0.9:1-1.4:1 into an acidic solution containing zinc and aluminum to perform zinc sulfide precipitation, and performing solid-liquid separation to obtain zinc sulfide slag and an acidic solution containing aluminum; controlling the pH value at the end point to be 3.7-4.0;
s4, precipitating and recovering aluminum: adding a precipitator into the aluminum-containing acidic solution obtained in the step S3 for aluminum recovery, wherein the amount of the precipitator is 0.4-0.7 wt% of the mass of the aluminum-containing acidic solution, the pH value is adjusted to 7.0-8.5, high-aluminum slag and filtrate are obtained after solid-liquid separation, and the obtained filtrate can be recycled or discharged after reaching the standard;
the precipitant comprises one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate and ammonia water.
Example 2
The acidic pit water produced in the mining process of a multi-metal sulfide mine contains H2SO410g/L、Cu2+0.37g/L、Zn2 +0.27g/L、Al3+1.6g/L、TFe 7.2g/L、Fe3+6.6g/L、SO4 2-30-35g/L，pH＝1.35。
The method mainly comprises the following implementation steps:
(1) preparing calcium sulfate whiskers by deacidification: 10 liters of acidic wastewater is weighed into a reaction tank, and 110g of limestone (CaCO in limestone) is added under the condition of normal temperature stirring3Content 94 wt%, the same applies below) was neutralized, and the reaction was stirred for 20min, with an end point pH of 2.25. And filtering after the reaction is finished to obtain a polymetallic acid solution A (filtrate) containing copper, iron, zinc and aluminum and gypsum slurry. Transferring all the gypsum slurry into a reaction kettle, wherein the mass of the gypsum slurry and water is 1: 9, adding water into a reaction kettle, adding 0.08 wt% of sodium nitrate, carrying out crystal transformation reaction for 90min under the process conditions of the reaction temperature of 135 ℃ and the stirring speed of 160rpm, then carrying out flash evaporation, separation and drying to obtain the calcium sulfate whisker product.
(2) Neutralizing and depositing iron and producing gypsum: transferring all the polymetallic acid solution A (filtrate) obtained in the step (1) into a reaction tank, adding 170g of limestone under the stirring condition for neutralization, stirring for reaction for 20min, adding 0.02 wt% of dodecylamine during the reaction, and keeping the end-point pH to be 3.55; after the reaction, carrying out sedimentation and thickening, and carrying out solid-liquid separation on the obtained ferric hydroxide precipitate, gypsum (filter residue) and a polymetallic acid solution B (filtrate) containing copper, zinc, aluminum and the like.
(3) Step recovery of copper and zinc: transferring all the polymetallic acid solution B (filtrate) obtained in the step (2) into a reaction tank, adding 4.4g of sodium sulfide under the condition of stirring for copper sulfide precipitation, stirring for reaction for 60min, and performing solid-liquid separation to obtain copper sulfide slag (filter residue) and an acid solution (filtrate) containing zinc and aluminum, wherein the final pH value is 3.85; and transferring all the obtained acidic solution containing zinc and aluminum into a reaction tank, adding 3.78g of sodium sulfide under the stirring condition to perform zinc sulfide precipitation, stirring and reacting for 60min, wherein the final pH is 4.0, and performing solid-liquid separation to obtain zinc sulfide slag (filter residue) and an acidic solution containing aluminum (filtrate).
(4) Precipitating and recovering aluminum: and (3) transferring all the aluminum-containing acidic solution (filtrate) obtained in the step (3) into a reaction tank, adding 35.7g of sodium hydroxide under the stirring condition to precipitate aluminum, stirring and reacting for 60min, wherein the end point pH of the solution is 7.5, performing solid-liquid separation to obtain an aluminum hydroxide product (filter residue) and the solution (filtrate), wherein the concentrations of copper, iron, zinc and aluminum metal ions in the treated solution are all less than 0.02mg/L, and the wastewater can be recycled or discharged after reaching the standard.
The test results are as follows:
(1) CaSO in the calcium sulfate whisker generated in the step (1)4·2H2The mass content of O is 98 percent, and the average length-diameter ratio is 45;
(2) CaSO in gypsum generated in step (2)4·2H2The mass content of O is 74.6 percent; fe in iron hydroxide slag2O3The mass content of (A) is 80%;
(3) the mass content of CuS in the copper sulfide slag generated in the step (3) is 60.6%, and the mass content of ZnS in the zinc sulfide slag is 66%;
(4) in the aluminum hydroxide product produced in the step (4), Al is contained2O3The mass content of (A) is 58%.
Example 3
The water quality of the acid pit water produced in the mining process of a certain multi-metal sulfide mine is the same as that of the acid pit water produced in the example 1.
The method mainly comprises the following implementation steps:
(1) preparing calcium sulfate whiskers by deacidification: 10 liters of acidic wastewater is weighed into a reaction tank, 110g of limestone is added for neutralization under the condition of normal temperature stirring, the mixture is stirred and reacted for 20min, and the end point pH is 2.25. And filtering after the reaction is finished to obtain the polymetallic acid solution A containing copper, iron, zinc and aluminum and gypsum slurry. Transferring all the gypsum slurry into a reaction kettle, wherein the mass of the gypsum slurry and water is 1: 7, adding water into a reaction kettle, adding 0.02 wt% of sodium nitrate, carrying out crystal transformation reaction for 60min under the process conditions of the reaction temperature of 140 ℃ and the stirring speed of 150rpm, then carrying out flash evaporation, separation and drying to obtain the calcium sulfate whisker product.
(2) Neutralizing and depositing iron and co-producing gypsum: transferring all the polymetallic acid solution A (filtrate) obtained in the step (1) into a reaction tank, adding 135g of limestone under the stirring condition for neutralization, stirring for reaction for 20min, adding 0.8 wt% of sodium dodecyl sulfate in the reaction process, and adjusting the end-point pH to 3.5; after the reaction, carrying out sedimentation and thickening, and carrying out solid-liquid separation on the obtained ferric hydroxide precipitate, gypsum (filter residue) and a polymetallic acid solution B (filtrate) containing copper, zinc, aluminum and the like.
(3) Step recovery of copper and zinc: transferring all the polymetallic acid solution B (filtrate) obtained in the step (2) into a reaction tank, adding 3.0g of sodium sulfide under the condition of stirring for copper sulfide precipitation, stirring for reaction for 60min, and performing solid-liquid separation to obtain copper sulfide slag (filter residue) and an acid solution (filtrate) containing zinc and aluminum, wherein the final pH value is 3.7; and transferring all the obtained acidic solution containing zinc and aluminum into a reaction tank, adding 2.5g of sodium sulfide under the stirring condition to perform zinc sulfide precipitation, stirring and reacting for 60min, wherein the final pH value is 3.95, and performing solid-liquid separation to obtain zinc sulfide slag (filter residue) and an acidic solution containing aluminum (filtrate).
(4) Precipitating and recovering aluminum: and (3) transferring all the aluminum-containing acidic solution (filtrate) obtained in the step (3) into a reaction tank, adding 63g of sodium carbonate under stirring to precipitate aluminum, stirring to react for 60min, wherein the end point pH of the solution is 8.5, performing solid-liquid separation to obtain an aluminum hydroxide product (filter residue) and the solution (filtrate), wherein the concentrations of copper, iron, zinc and aluminum metal ions in the treated solution are all less than 0.02mg/L, and the wastewater can be recycled or discharged after reaching the standard.
The test results are as follows:
(1) CaSO in the calcium sulfate whisker generated in the step (1)4·2H2The mass content of O is 98.6 percent, and the average length-diameter ratio is 55;
(2) CaSO in gypsum generated in step (2)4·2H2The mass content of O is 75.2%; iron hydroxide slagMiddle Fe2O3The mass content of (A) is 76.8%;
(3) the mass content of CuS in the copper sulfide slag generated in the step (3) is 62.3%, and the mass content of ZnS in the zinc sulfide slag is 62%;
(4) in the aluminum hydroxide product produced in the step (4), Al is contained2O3The mass content of (b) is 56.5%.
Example 4
Acidic waste water containing H in the wet production process of a certain copper sulfide mine2SO412.7g/L、Cu2+0.11g/L、Zn2+0.25g/L、Al3+1.5g/L、TFe 10.8g/L、Fe3+9.5g/L、SO4 2-40-45g/L，pH＝1.18。
The method mainly comprises the following implementation steps:
(1) preparing calcium sulfate whiskers by deacidification: taking 10 liters of acidic wastewater into a reaction tank, adding 140g of limestone under the condition of stirring at normal temperature for neutralization, and stirring for reaction for 20min, wherein the end point pH is 2.45; after the reaction is finished, filtering is carried out, and the polymetallic acid solution A (filtrate) containing copper, iron, zinc, aluminum and the like and gypsum slurry are generated. Transferring all the gypsum slurry into a reaction kettle for crystal conversion reaction, wherein the crystal conversion reaction is carried out according to the following steps: water 1: 35, adding water into a reaction kettle, adding 5 wt% of magnesium nitrate, reacting for 180min at the reaction temperature of 90 ℃ and the stirring speed of 180rpm, then carrying out flash evaporation and separation, and drying to obtain the calcium sulfate whisker product.
(2) Neutralizing and depositing iron and producing gypsum: transferring all the polymetallic acid solution A (filtrate) obtained in the step (1) into a reaction tank, adding 252g of limestone under the stirring condition for neutralization, stirring for reaction for 20min, adding 0.04 wt% of dodecylamine during the reaction process, and enabling the end-point pH to be 3.0; after the reaction, the mixture is concentrated, and solid-liquid separation is carried out to generate ferric hydroxide precipitate, calcium sulfate (filter residue) and polymetallic acid solution B (filtrate) containing copper, zinc and aluminum.
(3) Step recovery of copper and zinc: transferring all the polymetallic acid solution (filtrate) obtained in the step (2) into a reaction tank, adding 1.0g of sodium sulfide under the condition of stirring for copper sulfide precipitation, stirring for reaction for 60min, and performing solid-liquid separation to obtain copper sulfide slag (filter residue) and an acid solution (filtrate) containing zinc and aluminum; transferring all obtained filtrate into a reaction tank, adding 3.5g of sodium sulfide under the stirring condition to perform zinc sulfide precipitation, stirring and reacting for 60min, wherein the final pH value is 4.0, and performing solid-liquid separation to generate zinc sulfide slag (filter residue) and an aluminum-containing acidic solution (filtrate).
(4) Precipitating and recovering aluminum: and (3) transferring all the aluminum-containing acidic solution (filtrate) obtained in the step (3) into a reaction tank, adding 34g of sodium hydroxide under stirring to deposit aluminum, stirring to react for 60min, wherein the end point pH of the solution is 7.0, carrying out solid-liquid separation to generate an aluminum hydroxide product (filter residue) and the solution (filtrate), wherein the concentrations of copper, iron, zinc and aluminum metal ions in the treated solution are all less than 0.02mg/L, and the wastewater can be recycled or discharged after reaching the standard.
The test results are as follows:
(1) CaSO in the calcium sulfate whisker generated in the step (1)4·2H2The mass content of O is 97.6 percent, and the average length-diameter ratio is 30;
(2) CaSO in gypsum generated in step (2)4·2H2The mass content of O is 75.5%; (ii) a Fe in iron hydroxide slag2O3The mass content of (A) is 82%;
(3) the mass content of CuS in the copper sulfide slag generated in the step (3) is 59.8%, and the mass content of ZnS in the zinc sulfide slag is 64.6%;
(4) al in the aluminum hydroxide product generated in the step (4)2O3The mass content of (b) is 56%.
Various corresponding changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.
Claims (5)
1. The method for comprehensively utilizing the multi-metal acidic wastewater of the nonferrous metal mine is characterized by comprising the following steps of:
s1, preparing calcium sulfate whiskers by reducing acid:
adding calcium carbonate into the acidic wastewater for deacidification, and generating a polymetallic acidic solution A containing copper, iron, zinc and aluminum and gypsum slurry after thickening; pumping gypsum slurry into a reaction kettle for crystal transformation reaction, wherein the mass ratio of the gypsum slurry to water is 1: 7-35 adding water into the reaction kettle, adding a crystal transformation agent, reacting for 60-180min under the process conditions that the reaction temperature is 90-140 ℃, the stirring speed is 150-; the addition amount of the crystal transformation agent is 0.02 wt% -5 wt% of the mass of the gypsum slurry;
s2, neutralizing and depositing iron and producing gypsum:
adding a neutralizing agent into the polymetallic acid solution A obtained in the step S1 for neutralization, adding a separating agent after the neutralization reaction is finished, and controlling the end-point pH to be 3.0-3.6; performing sedimentation and thickening, and performing solid-liquid separation to generate ferric hydroxide precipitate, gypsum and a multi-metal acid solution B containing copper, zinc and aluminum, wherein the addition amount of the separating agent is 0.02-0.8 wt% of the mass of the multi-metal acid solution A;
s3, carrying out step recovery on the polymetallic acid solution B obtained in the step S2 to obtain copper and zinc:
adding sodium sulfide with the mass ratio of 0.8-1.2:1 to the copper ions into the polymetallic acid solution B for copper sulfide precipitation, and carrying out solid-liquid separation to obtain copper sulfide slag and an acid solution containing zinc and aluminum; adding sodium sulfide with the mass ratio of zinc ions to zinc ions of 0.9:1-1.4:1 into an acidic solution containing zinc and aluminum to perform zinc sulfide precipitation, performing solid-liquid separation to obtain zinc sulfide slag and an acidic solution containing aluminum, and controlling the end-point pH to be 3.7-4.0;
s4, precipitating and recovering aluminum: adding a precipitator into the acidic solution containing aluminum obtained in the step S3 to recover aluminum, adjusting the pH to 7.0-8.5, and performing solid-liquid separation to obtain high-aluminum slag and filtrate.
2. The method for comprehensively utilizing the multi-metal acidic wastewater of the nonferrous metal mine according to claim 1, wherein in the step S1, the crystal transformation agent comprises one or more of sodium nitrate, sodium chloride, sodium sulfate, magnesium nitrate, magnesium chloride and sodium citrate.
3. The method for comprehensively utilizing the multi-metal acidic wastewater of the nonferrous metal mine according to claim 1, wherein the neutralizing agent comprises one or more of calcium carbonate, calcium oxide, sodium carbonate, magnesium carbonate and magnesium oxide in step S2.
4. The method for comprehensively utilizing the multi-metal acidic wastewater of the nonferrous metal mine according to claim 1, wherein in the step S2, the separating agent comprises one or more of sodium citrate, dodecylamine, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and sodium lignosulfonate.
5. The method for comprehensively utilizing the multi-metal acidic wastewater of the nonferrous metal mine according to claim 1, wherein in the step S4, the precipitating agent comprises one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate and ammonia water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010660719.3A CN111777224B (en) | 2020-07-10 | 2020-07-10 | Method for comprehensively utilizing polymetallic acid wastewater of nonferrous metal mine |
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| CN113769886A (en) * | 2021-09-10 | 2021-12-10 | 厦门紫金矿冶技术有限公司 | Resource utilization method of mine high-iron high-acid wastewater neutralization slag |
| CN114149031A (en) * | 2021-12-07 | 2022-03-08 | 紫金矿业集团股份有限公司 | Method for preparing ferrous sulfate from copper smelting slag |
| CN114436426A (en) * | 2020-11-06 | 2022-05-06 | 湖南天童环保有限公司 | Treatment agent and process for metallurgical waste acid and metal and heavy metal-containing composite wastewater |
| CN115385473A (en) * | 2022-08-11 | 2022-11-25 | 广东工业大学 | Method for recovering valuable metals in acid mine wastewater |
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