CN113105020A - Method for recycling nickel resources in waste acid system - Google Patents
Method for recycling nickel resources in waste acid system Download PDFInfo
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- CN113105020A CN113105020A CN202110385121.2A CN202110385121A CN113105020A CN 113105020 A CN113105020 A CN 113105020A CN 202110385121 A CN202110385121 A CN 202110385121A CN 113105020 A CN113105020 A CN 113105020A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- 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
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Abstract
The invention discloses a method for recovering nickel resources in a waste acid system, which comprises the following steps: (1) adding a lime neutralizing agent into the waste acid, adjusting the pH value to 4.0-4.5, reacting for 10-30 minutes, and performing filter pressing to obtain a filtrate A and a filter residue A; (2) adding a strong base neutralizing agent into the filtrate A, adjusting the pH value to 5.5-8.5, reacting for 30-60 minutes, adding a carbonate neutralizing agent, and adjusting the pH value to 9.0-11.0 to obtain a mixed solution; (3) adding a heavy metal remover into the mixed solution, stirring, and performing filter pressing to obtain a filtrate B and nickel mud; (4) drying and dehydrating the nickel mud to obtain a nickel product. The invention can effectively improve the recovery rate of nickel in waste acid and the purity of nickel products and reduce the pollution to the environment by using different neutralizers for three-step neutralization in sequence, and the recovery method has simple process, low price of the used neutralizer and low cost.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for recovering nickel resources in a waste acid system.
Background
Nickel is a heavy metal that can cause cancer, but it is a relatively expensive metal resource, which is 2-4 times as expensive as copper. With the accelerated development of economy, the demand of China for nickel is increasingly increased. Since 2005, China has become the world with the largest consumption of nickel, and currently 65% of nickel in the world is used for producing stainless steel. With the rapid development of the stainless steel industry, the demand of nickel in the world is increasing continuously, and the situation of short supply and short demand appears.
At present, in the process of processing nickel-chromium stainless steel, an oxide layer on the surface of stainless steel needs to be removed by pickling treatment, so that a large amount of nickel-containing waste acid is generated, the nickel-containing waste acid contains great acidity, meanwhile, the stainless steel waste acid also contains a large amount of heavy metal ions, and the acidity or the heavy metal ions have great harm to the environment and human beings and need to be properly treated.
The nickel-containing waste acid belongs to toxic waste water which is difficult to degrade, the treatment process of the waste acid mainly comprises a chemical precipitation method, an ion exchange method, an electrodialysis method, a roasting method and the like at the present stage, and the electrodialysis method and the ion exchange method have high recovery rate, but have higher power consumption, high cost and large required investment; the roasting method is easy to cause the shortening of the service life of equipment due to high-temperature operation, and acid gas and dust generated due to high temperature can cause secondary pollution to air and environment; the chemical precipitation method has the advantages of good treatment effect, low investment, simple and convenient operation and the like, but the chemical precipitation method has the disadvantages of large sludge amount, difficult dehydration, low heavy metal content in the sludge and low heavy metal recovery rate.
Disclosure of Invention
The invention aims to provide a method for recovering nickel resources in a waste acid system, which can effectively improve the recovery rate of nickel in waste acid and the purity of a nickel product and reduce the pollution to the environment by carrying out three-step neutralization by sequentially using different neutralizers.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for recovering nickel resources in a waste acid system comprises the following steps:
(1) adding a lime neutralizing agent into the waste acid, adjusting the pH value to 4.0-4.5, reacting for 10-30 minutes, and performing filter pressing to obtain a filtrate A and a filter residue A;
(2) adding a strong base neutralizing agent into the filtrate A, adjusting the pH value to 5.5-8.5, reacting for 30-60 minutes, adding a carbonate neutralizing agent, adjusting the pH value to 9.0-11.0, and reacting for 30-60 minutes to obtain a mixed solution;
(3) adding a heavy metal remover into the mixed solution, reacting for 10-20 minutes, and performing filter pressing to obtain a filtrate B and nickel mud;
(4) drying and dehydrating the nickel mud to obtain a nickel product.
Further, the lime neutralizing agent is one or more of quicklime, slaked lime, calcium carbonate and emulsion thereof.
The method for recycling nickel resources in a waste acid system according to claim 1, wherein the strong base neutralizing agent is one or both of a sodium hydroxide solution and a potassium hydroxide solution.
Further, the carbonate neutralizer is one or more of a sodium carbonate solution, a sodium bicarbonate solution, an ammonium carbonate solution and an ammonium bicarbonate solution.
Further, the heavy metal remover is one or two of sodium sulfide and composite sodium sulfide.
Further, the mass concentration of the solutions of the strong base neutralizing agent, the carbonate neutralizing agent and the heavy metal remover is 10-20%.
Further, the waste acid system is one of a hydrochloric acid system, a sulfuric acid system, a phosphoric acid system or a hydrofluoric acid system.
Further, the nickel content in the nickel product is 20.42-24.3% by mass ratio.
Further, in the step (4), the drying temperature of the nickel mud is 105-150 ℃.
Further, in the step (1), before adding the lime neutralizing agent into the waste acid, the waste acid is filtered, and the lime neutralizing agent is added into the filtrate obtained after filtering.
The invention has the beneficial effects that:
1. according to the invention, through carrying out three times of neutralization reactions by using different neutralizers in sequence and carrying out three steps of sedimentation, the enrichment and recovery of nickel are facilitated, the heavy metal nickel in a waste acid system can be effectively recovered, the recovery rate of nickel in waste acid and the purity of a nickel product are improved, and the resource recovery is realized.
2. After the pH value of the mixed solution is adjusted to 9.0-11.0, a heavy metal remover is added into the mixed solution, and micro molecules in the heavy metal remover can form a strong bond with nickel, so that precipitation is formed, the recovery rate of nickel can be further improved, and the content of nickel in a nickel product can be further improved.
3. The method for recovering nickel resources in the acid system has simple process, the price of the used neutralizing agent is low, the investment is low, and a large amount of cost can be saved.
Drawings
FIG. 1 is a schematic diagram of a process for nickel recovery in a spent acid system of the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and the detailed description.
A method for recovering nickel resources in a waste acid system comprises the following steps:
(1) adding a lime neutralizing agent into the waste acid, adjusting the pH value to 4.0-4.5, reacting for 10-30 minutes, and performing filter pressing to obtain a filtrate A and a filter residue A;
(2) adding a strong base neutralizing agent into the filtrate A, adjusting the pH value to 5.5-8.5, reacting for 30-60 minutes, adding a carbonate neutralizing agent, adjusting the pH value to 9.0-11.0, and reacting for 30-60 minutes to obtain a mixed solution;
(3) adding a heavy metal remover into the mixed solution, reacting for 10-20 minutes, and performing filter pressing to obtain a filtrate B and nickel mud;
(4) drying and dehydrating the nickel mud to obtain a nickel product.
It is worth to be noted that, as shown in fig. 1, the method of the present invention sequentially performs three neutralization reactions using different neutralizers, and performs three-step sedimentation, thereby facilitating nickel enrichment and recovery, effectively recovering heavy metal nickel in a waste acid system, improving the recovery rate of nickel in the waste acid and the purity of nickel products, and realizing resource recovery.
In the step (1), lime neutralizing agents are used, the pH value is adjusted to 4.0-4.5, impurities such as iron and aluminum are precipitated and separated out, impurities such as iron and aluminum in waste acid can be effectively removed through filter pressing, a large amount of acid can be consumed, the acidity of waste liquid is reduced, and the pollution to the environment is reduced. In the step (2), the strong-alkalinity strong-alkali neutralizing agent is used, so that the alkalinity of the solution can be quickly adjusted, the addition amount of the neutralizing agent can be reduced, the phenomenon that excessive water is introduced to prolong the drying time in the later period is avoided, the energy consumption is increased, and the cost is increased. In the third step of neutralization reaction, the pH value can be finely adjusted by using a carbonate neutralizer to be 9.0-11.0, so that the pH value is prevented from being too high, nickel precipitation is facilitated, and the filtering performance is improved.
Specifically, when the first step of neutralization is carried out, if the pH value is less than 4.0, impurities such as iron, aluminum and the like are incompletely precipitated, and the recovery rate and the purity of nickel are influenced; if the pH value is more than 4.5, more nickel is precipitated and separated out to the filter residue A in the first step, and the recovery rate of nickel is reduced. And (2) disposing the filter residue A obtained in the step (1) by an environmental protection bureau.
After the pH value of the mixed solution is adjusted to 9.0-11.0, a heavy metal remover is added into the mixed solution, and micro molecules in the heavy metal remover can form a strong bond with nickel, so that precipitation is formed, the recovery rate of nickel can be further improved, and the content of nickel in a nickel product can be further improved. Specifically, a heavy metal remover is added into the mixed solution, the mixed solution is stirred to react for 10-20 minutes, nickel is fully precipitated and separated out, filter pressing is carried out to obtain filtrate B and nickel mud, the filtrate B can be directly discharged after evaporation desalination treatment, secondary pollution to the environment is avoided, and a nickel product with high purity can be obtained after the nickel mud is dried by using drying equipment.
Preferably, the step (1) and the step (3) are filter-pressed by using a plate-and-frame filter press.
Further, the lime neutralizing agent is one or more of quicklime, slaked lime, calcium carbonate and emulsion thereof.
In the first step of neutralization reaction, quicklime, hydrated lime and calcium carbonate are used as neutralizing agents, and lime neutralizing agents with weak alkalinity are used to prevent the alkalinity of local solution from rapidly rising in the process of adding lime neutralizing agents due to overhigh alkalinity, so that nickel precipitates are separated out in the first step of filter pressing and are filtered out along with filter residues, and the content of nickel products in the later period is reduced. Besides, the quicklime, the slaked lime and the calcium carbonate are cheap, and the cost can be reduced.
Further, the strong base neutralizing agent is one or two of sodium hydroxide solution and potassium hydroxide solution.
The alkalinity of the sodium hydroxide solution and the potassium hydroxide solution is strong, the alkalinity of the solution can be adjusted rapidly, when the pH is adjusted by using the sodium hydroxide solution or the potassium hydroxide solution, the sodium hydroxide solution and the potassium hydroxide solution need to be added slowly, and stirring needs to be kept during the process of adding the strong base neutralizing agent, so that the local solution is prevented from being over-alkaline. Sodium hydroxide and potassium hydroxide are common, easy to obtain and relatively cheap, and can save cost.
Further, the carbonate neutralizer is one or more of sodium carbonate solution, sodium bicarbonate solution, ammonium carbonate solution and ammonium bicarbonate solution.
In the third step of neutralization reaction, weakly alkaline carbonate solution is used for fine adjustment of pH, the sodium carbonate solution, the sodium bicarbonate solution, the ammonium carbonate solution and the ammonium bicarbonate solution are cheap, and other impurities are introduced in the middle of the reaction process to pollute the environment.
Preferably, the heavy metal remover is one or two of sodium sulfide and composite sodium sulfide.
The sulfur element in the sodium sulfide or the composite sodium sulfide can form a strong bonding bond with the nickel, so that a precipitate is formed, the bonding capability of the sodium sulfide or the composite sodium sulfide is stronger than that of other heavy metal removers, and the content of the nickel in the solution is reduced, so that the content of the nickel in the nickel product is increased.
Preferably, the mass concentration of the solution of the strong base neutralizing agent, the carbonate neutralizing agent and the heavy metal remover is 10-20%.
It is worth to say that the use effect is influenced and a large amount of water is introduced due to the fact that the concentrations of the lime neutralizing agent, the strong alkali neutralizing agent, the carbonate neutralizing agent and the heavy metal remover are too low; too high concentration can cause local over-alkali and affect the purity of the nickel product, so that the preferable mass concentration of the strong alkali neutralizing agent, the carbonate neutralizing agent and the heavy metal remover is 10-20%.
Preferably, the waste acid system is one of a hydrochloric acid system, a sulfuric acid system, a phosphoric acid system or a hydrofluoric acid system.
The invention respectively processes each waste acid system, can pertinently adjust proper pH and select proper neutralizing agent according to the acidity and the main components of the waste acid system, is more beneficial to the recovery of nickel resources in the waste acid and the removal of other impurities, thereby improving the recovery rate of nickel and the quality of nickel products.
Furthermore, the nickel content in the nickel product is 20.42-24.3% by mass ratio.
Preferably, in the step (4), the drying temperature of the nickel mud is 105-150 ℃.
The drying temperature is too low, the drying time is long, the drying temperature is too high, the consumed electric energy is large, and the quality of the nickel is possibly damaged.
Preferably, in the step (1), before the lime neutralizing agent is added into the waste acid, the waste acid is filtered, and the lime neutralizing agent is added into the filtrate obtained after filtering.
Specifically, when lime neutralizing agents are added for neutralization reaction, waste liquid is conveyed to a filter pressing system through a pump to remove solid impurities, the neutralization reaction is conveniently carried out, and the purity of products is improved.
Preferably, the pressure filtration system is a bag filter.
The technical solution is further illustrated by the following examples.
Example 1
The used waste acid system is a phosphoric acid system, the nickel content is 9.93g/L, the total phosphorus is 2.09g/L, and the acidity (calculated by H3PO 4) is 988 g/L. And (3) enabling the waste acid filtered by the precision filter to reach a stirring tank, slowly adding 15% lime milk, adjusting the pH value of the feed liquid to be 4.0, stirring for 20min, and pumping the waste acid into a plate-and-frame filter press for filter pressing to obtain filtrate A and filter residue A. Treating the filter residue A by an environmental protection bureau; adding 15% sodium hydroxide solution into the filtrate A, adjusting the pH value of the solution to 6.0, stirring and reacting for 30min, adding 15% sodium carbonate solution, adjusting the pH value of the solution to 9.0, and reacting for 30min to obtain a mixed solution; and adding 10% sodium sulfide solution into the mixed solution, stirring and reacting for 10min, pumping into a plate frame and filter-pressing to obtain filtrate B and nickel mud, passing the nickel mud through a drying device at 105 ℃ to obtain a nickel product with higher grade, and performing subsequent evaporation and desalination treatment on the filtrate B to discharge the nickel product up to the standard.
Through detection, the nickel content in the nickel product is 20.42 percent according to the mass ratio.
Example 2
The used waste acid system is a nitric acid system, the nickel content is 14.7g/L, the total phosphorus content is 4.12g/L, and the acidity is (by HNO)3Meter) was 189 g/L. And (3) enabling the waste acid filtered by the precision filter to reach a stirring tank, slowly adding 15% lime milk, adjusting the pH value of the feed liquid to be 4.1, stirring for 20min, and pumping the waste acid into a plate-and-frame filter press for filter pressing to obtain filtrate A and filter residue A. Treating the filter residue A by an environmental protection bureau; adding 15% potassium hydroxide solution into the filtrate A, adjusting the pH value of the solution to 8.0, stirring and reacting for 20min, adding 20% sodium bicarbonate solution, adjusting the pH value of the solution to 11, and reacting for 30min to obtain a mixed solution; and adding 15% of sodium sulfide solution into the mixed solution, stirring and reacting for 20min, pumping into a plate frame and performing filter pressing to obtain filtrate B and nickel mud, passing the nickel mud through a drying device at 120 ℃ to obtain a nickel product with higher grade, and performing subsequent evaporation and desalination treatment on the filtrate B to discharge the nickel product up to the standard.
Through detection, the nickel content in the nickel product is 21.3 percent according to the mass ratio.
Example 3
The used waste acid system is a nitric acid system, the nickel content is 18g/L, the total phosphorus content is 5.65g/L, and the acidity is (by HNO)3Calculated) was 205 g/L. And (3) enabling the waste acid filtered by the precision filter to reach a stirring tank, slowly adding 10% lime milk, adjusting the pH value of the feed liquid to be 4.5, stirring for 20min, and pumping the waste acid into a plate-and-frame filter press for filter pressing to obtain filtrate A and filter residue A. Treating the filter residue A by an environmental protection bureau; filter with filter elementAdding 15% sodium hydroxide solution into the solution A, adjusting the pH value of the solution to 7.0, stirring and reacting for 30min, adding 10% sodium bicarbonate solution, adjusting the pH value of the solution to 10, and reacting for 20min to obtain a mixed solution; adding 15% of composite sulfide alkali solution into the mixed solution, stirring and reacting for 20min, pumping into a plate frame and performing filter pressing to obtain filtrate B and nickel mud, passing the nickel mud through a drying device at the temperature of 115 ℃ to obtain a nickel product with higher grade, and performing subsequent evaporation and desalination treatment on the filtrate B to discharge the nickel product up to the standard.
Through detection, the nickel content in the nickel product is 22.1 percent according to the mass ratio.
Example 4
The waste acid system is hydrofluoric acid system, the nickel content is 11.4g/L, the total phosphorus content is 1.23g/L, and the acidity (calculated by HF) is 116 g/L. And (3) enabling the waste acid filtered by the precision filter to reach a stirring tank, slowly adding 10% lime milk, adjusting the pH value of the feed liquid to be 4.5, stirring for 20min, and pumping the waste acid into a plate-and-frame filter press for filter pressing to obtain filtrate A and filter residue A. Treating the filter residue A by an environmental protection bureau; adding 15% sodium hydroxide solution into the filtrate A, adjusting the pH value of the solution to 7.0, stirring and reacting for 30min, adding 10% sodium bicarbonate solution, adjusting the pH value of the solution to 10, and reacting for 20min to obtain a mixed solution; adding 15% of composite sulfide alkali solution into the mixed solution, stirring and reacting for 20min, pumping into a plate frame and performing filter pressing to obtain filtrate B and nickel mud, passing the nickel mud through a drying device at the temperature of 115 ℃ to obtain a nickel product with higher grade, and performing subsequent evaporation and desalination treatment on the filtrate B to discharge the nickel product up to the standard.
Through detection, the nickel content in the nickel product is 22.1 percent according to the mass ratio.
Example 5
The used waste acid system is a hydrochloric acid system, the nickel content is 15.2g/L, the total phosphorus content is 0.92g/L, and the acidity (calculated by HCl) is 139 g/L. And (3) enabling the waste acid filtered by the precision filter to reach a stirring tank, slowly adding 12% lime milk, adjusting the pH value of the feed liquid to be 4.1, stirring for 20min, and pumping into a plate-and-frame filter press for filter pressing to obtain filtrate A and filter residue A. Treating the filter residue A by an environmental protection bureau; adding 15% potassium hydroxide solution into the filtrate A, adjusting the pH value of the solution to 5.5, stirring and reacting for 30min, adding 10% ammonium bicarbonate solution, adjusting the pH value of the solution to 10, and reacting for 20min to obtain a mixed solution; and adding 12% of composite sulfide alkali solution into the mixed solution, stirring and reacting for 20min, pumping into a plate frame and performing filter pressing to obtain filtrate B and nickel mud, passing the nickel mud through a drying device at 135 ℃ to obtain a nickel product with higher grade, and performing subsequent evaporation and desalination treatment on the filtrate B to discharge the nickel product up to the standard.
Through detection, the nickel content in the nickel product is 24.3 percent according to the mass ratio.
Example 6
The used waste acid system is a sulfuric acid system, the nickel content is 13.2g/L, the total phosphorus content is 1.43g/L, and the acidity is expressed by H2SO4Calculated) was 167 g/L. And (3) enabling the waste acid filtered by the precision filter to reach a stirring tank, slowly adding 20% of lime milk, adjusting the pH value of the feed liquid to be 4.0, stirring for 20min, and pumping the waste acid into a plate-and-frame filter press for filter pressing to obtain filtrate A and filter residue A. Treating the filter residue A by an environmental protection bureau; adding 15% potassium hydroxide solution into the filtrate A, adjusting the pH value of the solution to 8.5, stirring and reacting for 30min, adding 15% ammonium carbonate solution, adjusting the pH value of the solution to 9.0, and reacting for 30min to obtain a mixed solution; and adding 20% sodium sulfide solution into the mixed solution, stirring and reacting for 10min, pumping into a plate frame and filter-pressing to obtain filtrate B and nickel mud, passing the nickel mud through a drying device at 105 ℃ to obtain a nickel product with higher grade, and performing subsequent evaporation and desalination treatment on the filtrate B to discharge the nickel product up to the standard.
Through detection, the nickel content in the nickel product is 23.4% by mass ratio.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A method for recovering nickel resources in a waste acid system is characterized by comprising the following steps:
(1) adding a lime neutralizing agent into the waste acid, adjusting the pH value to 4.0-4.5, reacting for 10-30 minutes, and performing filter pressing to obtain a filtrate A and a filter residue A;
(2) adding a strong base neutralizing agent into the filtrate A, adjusting the pH value to 5.5-8.5, reacting for 30-60 minutes, adding a carbonate neutralizing agent, adjusting the pH value to 9.0-11.0, and reacting for 30-60 minutes to obtain a mixed solution;
(3) adding a heavy metal remover into the mixed solution, reacting for 10-20 minutes, and performing filter pressing to obtain a filtrate B and nickel mud;
(4) drying and dehydrating the nickel mud to obtain a nickel product.
2. A method of recycling nickel resources from a spent acid system as claimed in claim 1, wherein the lime type neutralizing agent is one or more of quicklime, slaked lime, calcium carbonate and emulsions thereof.
3. The method for recycling nickel resources in a waste acid system according to claim 1, wherein the strong base neutralizing agent is one or both of a sodium hydroxide solution and a potassium hydroxide solution.
4. The method for recovering nickel resources in a waste acid system according to claim 1, wherein the carbonate neutralizer is one or more of a sodium carbonate solution, a sodium bicarbonate solution, an ammonium carbonate solution and an ammonium bicarbonate solution.
5. The method for recovering nickel resources in a waste acid system as claimed in claim 1, wherein the heavy metal remover is one or both of sodium sulfide and composite sodium sulfide.
6. The method for recovering nickel resources in a waste acid system as claimed in claim 1, wherein the mass concentrations of the solutions of the strong alkali neutralizing agent, the carbonate neutralizing agent and the heavy metal remover are respectively 10-20%.
7. The method of claim 1, wherein the spent acid system is one of a hydrochloric acid system, a sulfuric acid system, a phosphoric acid system, or a hydrofluoric acid system.
8. The method for recycling nickel resources in a waste acid system as claimed in claim 1, wherein the nickel content in the nickel product is 20.42-24.3% by mass.
9. The method for recycling nickel resources in a waste acid system as claimed in claim 1, wherein in the step (4), the drying temperature of the nickel sludge is 105-150 ℃.
10. The method for recycling nickel resources in a waste acid system as claimed in claim 1, wherein in the step (1), the waste acid is filtered before the lime neutralizing agent is added to the waste acid, and the lime neutralizing agent is added to the filtrate obtained after filtration.
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| CN113429030A (en) * | 2021-08-11 | 2021-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for cooperatively treating sintering desulfurization acid wastewater and machine head dedusting ash |
| CN115259466A (en) * | 2022-08-05 | 2022-11-01 | 广东先导稀材股份有限公司 | Method for treating nickel in high-ammonia-nitrogen high-salt wastewater |
| CN115386737A (en) * | 2022-08-12 | 2022-11-25 | 清远先导材料有限公司 | Method for recovering solution containing low-concentration cobalt and nickel |
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