CN107188292B - Method for purifying arsenic-containing waste liquid by utilizing cyaniding silver extraction waste residues - Google Patents
Method for purifying arsenic-containing waste liquid by utilizing cyaniding silver extraction waste residues Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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Abstract
The invention relates to a method for purifying arsenic-containing waste liquid by utilizing cyaniding silver extraction waste residue, wherein a first-stage oxidation precipitation adsorption technology is characterized in that the arsenic-containing waste liquid and arsenic-containing carbon gold concentrate are mixed and size-regulated, the concentration of ore pulp is controlled to be 10-30%, hydrogen peroxide and charged oxygen are used as oxidants, ferric sulfate is added as a precipitator, the pH value of precipitation is controlled, stirring is carried out, filter pressing and dehydration are carried out to produce a filter cake and filtrate, and the filter cake is used as two-stage roasting raw ore and enters a two-stage roasting acid-making; the second-stage deep purification solidification technology is that the primary treated liquid and the cyaniding silver extraction waste residue are mixed and size-mixed, the concentration of the ore pulp is controlled to be 10-30%, the high alkalinity and ferrous sulfate in the cyaniding silver extraction waste residue are used as a precipitator, the pH value is strictly controlled to be 6-7, oxygen is filled, the mixture is stirred for 2-4 hours, and filter cakes and secondary treated liquid are produced through filter pressing and dehydration; the liquid after the third-stage purification is returned to the two-stage roasting and size mixing process for recycling; and the fourth stage is that kaolin, calcium sulfate and cement are added into the utilized cyaniding silver extraction waste residue to prepare balls, and the balls are solidified and safely stockpiled.
Description
Technical Field
The invention relates to a method for purifying arsenic-containing waste liquid, in particular to a method for purifying arsenic-containing waste liquid by utilizing cyanide silver extraction waste residues generated in a cyanide silver extraction process, and belongs to the technical field of gold smelting waste residues, chemical industry waste water treatment and environmental protection.
Background
At present, silver-containing concentrate is subjected to a direct cyanidation silver extraction process, high-purity silver and high-alkalinity cyanidation tailings, namely cyanidation silver extraction waste residues, are produced through high-alkalinity ore grinding, alkaline leaching, cyanidation leaching, zinc powder replacement, fusion casting silver extraction and other processes, and the cyanidation silver extraction waste residues are treated by a stockpiling method, so that the stockpiling cost and the tailing pond maintenance cost are high, and the environment is greatly influenced. Therefore, the advanced treatment of the cyaniding silver extraction waste residue is imperative.
The hard-to-treat gold concentrate containing arsenic and carbon adopts two-stage roasting acid preparation, acid leaching impurity removal and cyaniding gold extraction process, and arsenic trioxide and sulfur dioxide are produced in the roasting processAnd (3) after mixing the flue gas, performing electric precipitation, wet quenching dearsenification and acid washing purification to obtain acidic arsenic-containing waste liquid, and performing secondary conversion and secondary absorption on the purified sulfur dioxide flue gas to produce a sulfuric acid product. The method for treating the acidic arsenic-containing waste liquid mainly comprises a lime neutralization method, a lime and iron salt neutralization method, a high-efficiency vulcanization purification method, a microbial oxidation degradation method and the like, wherein the main principle of the lime precipitation method is as follows: adding lime with the arsenic molar quantity of 4-10 times into the wastewater, and adjusting the pH of the wastewater to be more than 12 to ensure that the As in the wastewater3+、As5+Insoluble calcium arsenate, calcium arsenite and other precipitates are formed with the added calcium, so that the arsenic content in the water is effectively reduced, and finally, the pH value of the wastewater is adjusted by adding acid and other methods, so that the wastewater meets the requirements of discharge or subsequent treatment; the main principle of the sulfide precipitation method is as follows: under acidic condition, using As of different valence statesm+Can be reacted with S2-Formation of insoluble precipitated As2Sm; the main principle of the calcium-iron salt combined arsenic removal method is as follows: pre-oxidizing the waste water, adding ferric salt, adjusting the pH value, and adding a calcium precipitator to form calcium-arsenic slag. The arsenic-containing solid waste obtained by a sulfide precipitation method and a calcium-iron salt combined arsenic removal method is easy to dissolve out, and hidden danger exists in open-air stockpiling. The waste slag produced by the traditional iron salt precipitation method can be stably stored, but has the defects of low precipitation speed, large viscosity of the waste slag and the like. Therefore, how to reduce the amount of the arsenic-containing iron slag and improve the removal rate of arsenic is the key to the problem of treating the arsenic-containing wastewater. In any treatment method, the production and treatment costs are high, and the process flow is complicated.
Patent CN2011103043812A discloses an advanced treatment method of arsenic-containing wastewater, which oxidizes trivalent arsenic into pentavalent arsenic by oxidation, adds ferric salt and a polymeric organic flocculant to precipitate arsenic, accelerates the precipitation speed, shortens the precipitation time, increases the arsenic removal efficiency, but adds the amount of ferric salt to make the Fe/As molar ratio in the solution reach 5-50, obtains a large amount of arsenic-containing iron slag, and does not recycle the treated water.
Patent CN201611019998.5 is a treatment process of acidic arsenic-containing wastewater, in which chlorate or/and perchlorate is used as oxidant to oxidize trivalent arsenic into pentavalent arsenic, and inorganic flocculant and organic flocculant are added successively to perform flocculation precipitation dearsenification. The method adopts the oxidant, adopts multi-stage oxidation treatment and flocculation, still increases the complexity of the process, causes high production cost, adopts an outward discharge mode to treat the treated wastewater, and does not realize the aims of emission reduction and cyclic utilization.
Therefore, the technical scheme of researching and developing the method for simultaneously solving the harmless stockpiling of cyanide silver extraction waste residues and the high-efficiency purification treatment of arsenic-containing waste liquid by utilizing the advantages of the existing resources and realizing the recycling is very important, and the aims of reducing the treatment cost and improving the comprehensive utilization of hazardous wastes are fulfilled.
Disclosure of Invention
The invention provides a method for purifying arsenic-containing waste liquid by utilizing cyanide silver extraction waste residues, aiming at the defects of the existing treatment method of cyanide silver extraction waste residues and arsenic-containing acidic waste water.
The technical scheme for solving the technical problems is as follows:
a method for purifying arsenic-containing waste liquid by utilizing cyaniding silver extraction waste residue is characterized by comprising the following steps:
1) mixing acidic arsenic-containing waste liquid generated by the arsenic-carbon-containing gold concentrate through the two-stage roasting acid making process with arsenic-carbon-containing gold concentrate for size mixing, controlling the concentration of the ore pulp to be 10-30wt%, adding hydrogen peroxide and ferric salt into the ore pulp, and charging oxygen, wherein the adding amount of the hydrogen peroxide and the ferric salt is 5-7kg and the amount of the charged oxygen is 200-300m3Fully stirring to ensure that the reaction is complete, performing filter pressing and dehydration to produce a filter cake and a primary treatment liquid, and enabling the obtained filter cake to be used as raw ore of a two-stage roasting process to enter a two-stage roasting acid making process;
2) mixing the primary treated liquid obtained in the step 1) with the cyaniding silver extraction waste residue for size mixing, controlling the concentration of the ore pulp to be 10-30wt%, adding iron salt into the ore pulp, and charging oxygen, wherein the addition amount of the iron salt is 5-7kg and the oxygen charging amount is 200-300m3Fully stirring to ensure that the reaction is complete, controlling the pH to be 6-7 in the whole process, and performing filter pressing and dehydration to produce a filter cake and secondary treatment liquid;
3) recycling the secondary treated liquid obtained in the step 2) to a two-stage roasting acid making process to realize recycling;
4) mixing the filter cake obtained in the step 2) with kaolin, calcium sulfate and cement according to the mass ratio of 1: (0.1-0.2): (0.1-0.3): (0.1-0.5), pressing into balls, curing and safely piling up or selling.
Further, the production process of the acidic arsenic-containing waste liquid is as follows: analysis of main chemical elements of gold concentrate containing arsenic and carbon: 10-30g/t of gold, 30-150g/t of silver, 20-30 wt% of sulfur and 2.0-5.0 wt% of arsenic; 5-8 wt% of carbon, mixing the arsenic-containing carbon gold concentrate with the secondary treated liquid for size mixing, controlling the concentration of ore pulp to be 65-70 wt%, performing two-stage roasting process, performing gravity dust removal, electric dust removal, wet quenching dearsenification and acid cleaning purification on the flue gas containing arsenic trioxide, sulfur dioxide and mineral dust produced in the roasting process (in the invention, the secondary treated liquid is used as a flue gas wet purification liquid), performing electric demisting and secondary conversion secondary absorption process to produce a sulfuric acid product, and producing an acid waste liquid containing 400mg/l of arsenic and 1-3% of sulfuric acid concentration in the acid cleaning purification process, namely the acid arsenic-containing waste liquid.
Further, the generation process of the cyaniding silver extraction tailings is as follows: the cyanide silver extraction raw ore is subjected to ore grinding, alkaline leaching, cyanide leaching and zinc powder replacement to obtain silver mud containing 50-60% of silver and cyanide silver extraction tailings containing less than 20g/t of silver, wherein the content of main elements of the cyanide silver extraction raw ore is 2g/t of gold, 1000 g/t of silver, 0.2-0.5 wt% of copper, 1-3wt% of sulfur, 0.2-0.5 wt% of lead, 40-50 wt% of silicon dioxide, 10-15 wt% of calcium oxide, 5-8 wt% of magnesium oxide and 10-15 wt% of iron oxide.
Further, the ferric salt in the step 1) is ferric sulfate, and the ferric salt in the step 2) is ferrous sulfate.
Further, the reaction time of the reaction in step 1) and step 2) is 2 to 4 hours.
The invention utilizes the arsenic-carbon-containing gold concentrate and acidic arsenic-containing waste liquid produced by two-stage roasting process to carry out primary oxidation precipitation adsorption technology, the secondary technology utilizes cyaniding silver extraction waste residue and arsenic-containing waste water deep purification solidification technology, the third technology is purified liquid recycling technology, and the fourth technology is utilized cyaniding silver extraction waste residue solidification safe stockpiling technology.
The invention has the beneficial effects that:
the residual value of the cyaniding silver extraction waste residue and the acid arsenic-containing waste liquid is fully utilized, various problems and hidden troubles existing in the process of independently treating the cyaniding silver extraction waste residue and the acid arsenic-containing waste liquid are solved at one time, and the purposes of comprehensive treatment, cyclic utilization, economy and environmental protection of wastes are achieved.
Detailed Description
The principles and features of this invention are described below in conjunction with examples, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1:
a method for purifying arsenic-containing waste liquid by utilizing cyaniding silver extraction waste residues comprises the following steps:
1) generation of acidic arsenic-containing waste liquid: 10g/t of gold, 30g/t of silver, 20 wt% of sulfur and 2.0 wt% of arsenic; 5 wt% of carbon containing arsenic carbon gold concentrate and the second-stage treated liquid are mixed to be slurry, the concentration of the ore slurry is controlled to be 65 wt%, the two-stage roasting process is carried out, the flue gas containing arsenic trioxide, sulfur dioxide and mine dust produced in the roasting process is subjected to gravity dust removal, electric precipitation, wet quenching dearsenification, pickling purification (in the invention, the second-stage treated liquid is used as the flue gas wet purification liquid), electric demisting and secondary conversion secondary absorption processes to produce sulfuric acid products, and the pickling purification process produces acid waste liquid containing 200mg/l of arsenic and 1% of sulfuric acid concentration, namely acid arsenic waste liquid;
2) mixing the obtained acidic arsenic-containing waste liquid and arsenic-carbon-containing gold concentrate, controlling the concentration of ore pulp to be 10 wt%, adding 5kg of hydrogen peroxide and 5kg of ferric sulfate into each cubic meter of arsenic-containing waste liquid, and filling oxygen to the mixture to be 200m3Stirring for 2 hours, performing filter pressing dehydration to produce a filter cake and filtrate, and performing two-stage roasting on the filter cake as raw ore, namely gold concentrate containing arsenic and carbon to enter a two-stage roasting acid making process; the filtrate is the first-stage treated liquid and comprises the following components: the arsenic content is 20mg/l, the sulfuric acid concentration is 0.5 percent, and the liquid after the primary treatment enters a secondary treatment process for further deepening treatment;
3) mixing the primary treated liquid obtained in the step 2) with cyaniding silver extraction tailings for size mixing, controlling the concentration of ore pulp to be 10 wt%, and treating the primary treated liquid sulfur according to per cubic meterThe addition amount of ferrous acid is 5kg, the pH value in the process is controlled to be 6, and the aeration quantity is 200m3And h, stirring for 2 hours, performing filter pressing dehydration to produce a filter cake and a secondary treatment liquid, wherein the secondary treatment liquid comprises the following components: arsenic content 0.3mg/l, pH 6;
4) returning the secondary treated liquid obtained in the step 3) to the two-stage roasting acid making process in the step 1) for size mixing to realize recycling, wherein the concentration of pulp of size mixing is 65 wt%; part of the mixture returns to the two-stage roasting process and is used for regulating the temperature of the roasting furnace, and the using amount of the mixture is 3m3Hour/hour; the other part is used for the two-stage roasting acid-making purification washing process, and the dosage is 5m3The recycling is achieved within one hour;
5) mixing the filter cake obtained in the step 3) with kaolin, calcium sulfate and cement according to the mass ratio of 1: 0.1: 0.1: 0.1, pressing into balls, solidifying and safely piling or selling for serving as a production raw material of the aerated foam brick.
Example 2:
a method for purifying arsenic-containing wastewater by utilizing cyaniding silver extraction waste residues comprises the following steps:
1) generation of acidic arsenic-containing waste liquid: 20g/t of gold, 90g/t of silver, 25 wt% of sulfur and 3.5 wt% of arsenic; 6.5 wt% of carbon gold concentrate containing arsenic and carbon is mixed with the secondary treated liquid to be pulp-mixed, the concentration of the pulp is controlled to be 68 wt%, the two-stage roasting process is carried out, the flue gas containing arsenic trioxide, sulfur dioxide and mineral dust produced in the roasting process is subjected to gravity dust removal, electric precipitation, wet quenching dearsenification and pickling purification (in the invention, the secondary treated liquid is used as the liquid for flue gas wet purification), electric demisting and secondary conversion secondary absorption processes are carried out to produce sulfuric acid products, and the acid waste liquid containing 300mg/l of arsenic and 2% of sulfuric acid concentration, namely the acid arsenic-containing waste liquid, is produced in the pickling purification process;
2) mixing the obtained acidic arsenic-containing waste liquid and arsenic-carbon-containing gold concentrate, controlling the concentration of ore pulp to be 20 wt%, adding 6kg of hydrogen peroxide and 6kg of ferric sulfate into the arsenic-containing waste liquid per cubic meter, and charging oxygen by 250m3Stirring for 3 hours, performing filter pressing and dehydration to produce a filter cake and filtrate, and performing two-stage roasting on the filter cake as raw ore, namely gold concentrate containing arsenic and carbon to enter a two-stage roasting acid making process; the filtrate is the first-stage treated liquid and comprises the following components: arsenic content 25mg/l, sulfuric acidThe concentration is 1.0 percent, and the liquid after the primary treatment enters a secondary treatment process for further deepening treatment;
3) mixing the primary treated liquid obtained in the step 2) with cyaniding silver extraction tailings, controlling the concentration of ore pulp to be 20 wt%, controlling the addition of ferrous sulfate in each cubic meter of the primary treated liquid to be 6kg, controlling the pH value in the process to be 6.5 and controlling the aeration quantity to be 250m3And h, stirring for 3 hours, performing filter pressing dehydration to produce a filter cake and a secondary treatment liquid, wherein the secondary treatment liquid comprises the following components: arsenic content 0.4mg/l, pH 6.5;
4) returning the secondary treated liquid obtained in the step 3) to the two-stage roasting acid making process in the step 1) for size mixing, wherein the concentration of size mixing pulp is 68 wt%; part of the mixture returns to the two-stage roasting process and is used for regulating the temperature of the roasting furnace, and the using amount of the mixture is 4m3Hour/hour; the other part is used for the two-stage roasting acid-making purification washing process, and the dosage is 6.5m3The recycling is realized within one hour;
5) mixing the filter cake obtained in the step 3) with kaolin, calcium sulfate and cement according to the mass ratio of 1: 0.15: 0.2: 0.3, pressing into balls, solidifying and safely piling or selling for serving as a production raw material of the aerated foam brick.
Example 3:
a method for purifying arsenic-containing wastewater by utilizing cyaniding silver extraction waste residues comprises the following steps:
1) generation of acidic arsenic-containing waste liquid: 30g/t of gold, 150g/t of silver, 30wt% of sulfur and 5.0 wt% of arsenic; mixing gold concentrate containing arsenic and carbon with 8 wt% of carbon with the secondary treated liquid, controlling the concentration of ore pulp to be 70 wt%, performing two-stage roasting process, performing gravity dust removal, electric precipitation, wet quenching dearsenification, acid cleaning and purification on the flue gas containing arsenic trioxide, sulfur dioxide and mineral dust produced in the roasting process (in the invention, the secondary treated liquid is used as the liquid for wet flue gas purification), electric demisting and secondary conversion secondary absorption processes to produce sulfuric acid products, and producing acid waste liquid containing arsenic of 400mg/l and 3% of sulfuric acid concentration, namely acid arsenic-containing waste liquid in the acid cleaning and purification process;
2) mixing the obtained acidic arsenic-containing waste liquid with arsenic-carbon-containing gold concentrate, controlling the concentration of ore pulp to be 30wt%, adding 7kg of hydrogen peroxide and sulfur into each cubic meter of arsenic-containing waste liquidIron 7kg, oxygen charging 300m3Stirring for 4 hours, performing filter pressing dehydration to produce a filter cake and filtrate, and performing two-stage roasting on the filter cake as raw ore, namely gold concentrate containing arsenic and carbon to enter a two-stage roasting acid making process; the filtrate is the first-stage treated liquid and comprises the following components: 30mg/l of arsenic and 1.5 percent of sulfuric acid, and the liquid after the primary treatment enters a secondary treatment process for further deepening treatment;
3) mixing the primary treated liquid obtained in the step 2) with cyaniding silver extraction tailings, controlling the concentration of ore pulp to be 30wt%, controlling the addition of ferrous sulfate in each cubic meter of the primary treated liquid to be 7kg, controlling the pH value in the process to be 7, and controlling the aeration quantity to be 300m3And h, stirring for 4 hours, performing filter pressing dehydration to produce a filter cake and a secondary treatment liquid, wherein the secondary treatment liquid comprises the following components: arsenic content 0.5mg/l, pH 7;
4) returning the secondary treated liquid obtained in the step 3) to the two-stage roasting acid making process in the step 1) for size mixing, wherein the concentration of size mixing pulp is 70 wt%; part of the mixture returns to the two-stage roasting process and is used for regulating the temperature of the roasting furnace, and the dosage is 5m3Hour/hour; the other part is used for the two-stage roasting acid-making purification washing process, and the dosage is 8m3The recycling is realized within one hour;
5) mixing the filter cake obtained in the step 3) with kaolin, calcium sulfate and cement according to the mass ratio of 1: 0.2: 0.3: 0.5, pressing into balls, solidifying and safely piling or selling for serving as a production raw material of the aerated foam brick.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A method for purifying arsenic-containing waste liquid by utilizing cyaniding silver extraction waste residue is characterized by comprising the following steps:
1) mixing acidic arsenic-containing waste liquid with sulfuric acid concentration of 1% generated by two-stage roasting acid-making process of arsenic-carbon-containing gold concentrate with arsenic-carbon-containing gold concentrate, controlling ore pulp concentration to be 10-30wt%, adding hydrogen peroxide and ferric salt into the ore pulp, and charging oxygen, wherein each cubic meter of arsenic-containing gold concentrate isCalculated by waste liquid, the addition amount of the hydrogen peroxide and the ferric salt is 5-7kg, and the oxygen charging amount is 200-300m3Fully stirring to ensure that the reaction is complete, performing filter pressing and dehydration to produce a filter cake and a primary treatment liquid, and enabling the obtained filter cake to be used as raw ore of a two-stage roasting process to enter a two-stage roasting acid making process;
2) mixing the primary treated liquid obtained in the step 1) with the cyaniding silver extraction waste residue for size mixing, controlling the concentration of the ore pulp to be 10-30wt%, adding ferrite into the ore pulp, and filling oxygen, wherein the addition amount of the ferrite is 5-7kg and the amount of the oxygen is 200-300m3Fully stirring to ensure that the reaction is complete, controlling the pH to be 6 in the whole process, and performing filter pressing and dehydration to produce a filter cake and secondary treatment liquid;
3) recycling the secondary treated liquid obtained in the step 2) to a two-stage roasting acid making process to realize recycling;
mixing the filter cake obtained in the step 2) with kaolin, calcium sulfate and cement according to the mass ratio of 1: (0.1-0.2): (0.1-0.3): (0.1-0.5), pressing into balls, curing and safely piling up or selling.
2. The method as claimed in claim 1, wherein the acidic waste solution containing arsenic contains 200-400mg/l of arsenic and 1-3wt% of sulfuric acid.
3. The method for purifying the arsenic-containing waste liquid by utilizing the cyanide silver extraction waste residue according to claim 1 or 2, wherein the ferric salt in the step 1) is ferric sulfate, and the ferrous salt in the step 2) is ferrous sulfate.
4. The method for purifying the arsenic-containing waste liquid by utilizing the cyanide silver extraction waste residue according to claim 3, wherein the reaction time of the reaction in the step 1) and the step 2) is 2-4 hours.
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| CN111732223A (en) * | 2020-06-26 | 2020-10-02 | 长春黄金研究院有限公司 | Harmless treatment and backfill utilization method of high-arsenic cyanided tailings |
| CN112877547A (en) * | 2021-01-12 | 2021-06-01 | 紫金铜业有限公司 | Method for purifying high-lead-arsenic cyanide pregnant solution |
| CN113621826B (en) * | 2021-08-11 | 2022-07-29 | 山东国大黄金股份有限公司 | Method for improving leaching rate of copper acid in gold concentrate roasting |
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