CN113772869A - Quality-based treatment method for gold smelting wastewater - Google Patents

Quality-based treatment method for gold smelting wastewater Download PDF

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CN113772869A
CN113772869A CN202111086674.4A CN202111086674A CN113772869A CN 113772869 A CN113772869 A CN 113772869A CN 202111086674 A CN202111086674 A CN 202111086674A CN 113772869 A CN113772869 A CN 113772869A
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wastewater
water
tank
ammonia nitrogen
electrolytic
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CN113772869B (en
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林烽先
孙根荣
吴卫煌
伍赠玲
季常青
赖斌
丘俊杰
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Zijin Mining Group Gold Smelting Co Ltd
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Zijin Mining Group Gold Smelting Co Ltd
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    • C02F9/00—Multistage treatment of water, waste water or sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
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    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
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    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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    • C02F2201/46105—Details relating to the electrolytic devices
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Abstract

The invention discloses a quality-based treatment method for gold smelting wastewater, which comprises the following operation steps: firstly, pumping the extraction wastewater into a micro-electrolysis filler catalytic oxidation reaction tank, and enabling COD to reach 20-40 mg/L by controlling flow speed and reaction residence time under an aeration condition and then entering a comprehensive regulating tank; mixing the impurity-removed wastewater, the reduction wastewater and the alkaline solution water, controlling an acid-base neutralization reaction point through an intelligent pH sensor in a linkage manner to enable the pH of the mixed solution to be 7.5-8.5, recovering copper hydroxide precipitate from filter residue after filter pressing by a plate frame, and enabling the filtrate to enter a comprehensive regulating tank; thirdly, supplementing strong brine generated by an MVR system into the electrolyzed water, removing cyanide and ammonia nitrogen in an electrocatalytic oxidation reaction tank until the cyanide and the ammonia nitrogen reach the standard, buffering the cyanide and the ammonia nitrogen, and pumping the cyanide and the ammonia nitrogen into a comprehensive regulating tank; fourthly, the brine in the comprehensive regulating reservoir is deeply concentrated through an electrodialysis system, the concentrated water enters an MVR system for evaporation and crystallization, and the fresh water is recycled; the evaporated sodium chloride, sodium sulfate and sodium nitrate solid salt is used in snow melting agent, leather processing and dyeing and finishing industry. The invention has low wastewater treatment cost and high water recycling rate.

Description

Quality-based treatment method for gold smelting wastewater
Technical Field
The invention relates to the technical field of environment-friendly and clean production of non-ferrous metals, in particular to a technical method for classifying and treating waste water with different properties generated in a gold smelting process according to the properties.
Background
The gold smelting wastewater is complex in type and multiple in pollution factor, and is typically characterized by high COD, high ammonia nitrogen, high salt, heavy metal and cyanide; can be divided into acid wastewater and alkaline wastewater according to different specific treatment processes; the acidic wastewater comprises extraction wastewater, reduction wastewater and impurity-removing wastewater; the alkaline waste water is mainly alkaline liquor and gold electrolysis waste water generated by absorbing the alkaline liquor in the waste gas treatment process. The main pollutants of the extraction wastewater are COD and have high content, and the reduction wastewater and the impurity-removed wastewater mainly have high salinity and high heavy metal content; the alkali liquor absorption wastewater is mainly tail gas absorption wastewater of acid gas and has high salinity, and the gold electrolysis wastewater is wastewater after gold electrolysis and mainly has high cyanide content and ammonia nitrogen content. At present, the gold smelting wastewater treatment method generally adopts simple mixing and then carries out plate frame filtration, filtrate enters an MVR system for evaporation treatment, and the treatment method has the defects that the amount of evaporated water is large, condensed water cannot be recycled due to the exceeding of COD and ammonia nitrogen, environmental harmful factors are not thoroughly treated, toxic and harmful substances contained in mother liquor enter waste salt through evaporation, so that the waste salt becomes dangerous waste and cannot be reused, and the treatment cost is increased.
Disclosure of Invention
The invention aims to provide a quality-based treatment method of gold smelting wastewater with low wastewater treatment cost and high water recycling rate, so as to improve the resource utilization rate of the smelting wastewater generated in the gold smelting process and improve the level of clean production in the gold smelting industry.
In order to realize the purpose, the quality-based treatment method of the gold smelting wastewater comprises the following operation steps:
A. the extraction wastewater in the acidic wastewater is separately collected and treated, the extraction wastewater is pumped into a micro-electrolysis filler catalytic oxidation reaction tank, the micro-electrolysis catalytic oxidation technology is adopted, under the aeration condition, the flow rate is controlled and the reaction residence time is adjusted, so that the treated COD is 20-40 mg/L, and then the treated COD enters a comprehensive regulating tank;
the pH value of the extraction wastewater in the step A is 2.5-4.5; the microelectrolysis filler is a diatomite-based iron-carbon composite material, wherein the mass ratio of silicon dioxide is 15-30%, the mass ratio of iron is 30-60%, and the mass ratio of carbon is 10-55%, the microelectrolysis filler is prepared by roasting the microelectrolysis filler for 2-4 hours under the reducing atmosphere condition at the temperature of 1000-1500 ℃, and the specific surface area of the prepared filler is 500-1000 g/m2(ii) a The aeration condition is that the aeration intensity is 2-10 m3/m2H, the electrolytic retention time is 2-10 h;
B. mixing impurity-removing wastewater in acidic wastewater and reducing wastewater with alkaline liquor in alkaline wastewater, controlling acid-base neutralization reaction points by adjusting the flow of the opening of a valve in a linkage manner through an intelligent pH sensor, so that the pH of the mixed solution is 7.5-8.5, performing plate-and-frame filter pressing on the mixed solution, recovering copper hydroxide precipitate from filter residues, wherein the copper ion concentration of the filtrate is lower than 0.5mg/L, and feeding the filtrate into a comprehensive adjusting tank;
C. the treatment of the electrolyzed water in the alkaline wastewater is to supplement concentrated brine generated by an MVR system into the feed liquid so as to increase the concentration of chloride ions in the electrolyzed water, remove cyanide and ammonia nitrogen in an electrocatalytic oxidation reaction tank by adopting an electrochemical oxidation treatment mode so as to enable the cyanide and ammonia nitrogen to reach the discharge standard, buffer the discharge standard by a buffer tank and then pump the discharge standard into a comprehensive adjusting tank;
the volume ratio of the MVR supplementing concentrated salt water in the step C to the electrolyzed water is 10-30%; the electrocatalytic oxidation reaction tank comprises a power supply, a polar plate and an electrolytic tank, wherein the anode and the cathode of the electrolytic tank are one of plate-shaped or porous net-shaped; the anode material of the electrolytic cell is a titanium-based anode, the anode coating is a mixture of graphene, ruthenium and iridium, the components of the anode coating are 5.0-10.0% of graphene, 50.0-75.0% of ruthenium and 15.0-25.0% of iridium by mass ratio, and the thickness of the coating is 1.5-10.0 mu m; the cathode of the electrolytic cell is a stainless steel cathode; carrying out electrolysis under stirring, wherein the electrolysis working current density is 100-1000A/square meter; the temperature of an electrolytic system is 40-80 ℃; the electrolytic retention time is 2-8 h; the total cyanogen concentration in the feed liquid after the electrocatalytic oxidation treatment is lower than 0.5mg/L, and the ammonia nitrogen concentration is lower than 5 mg/L;
D. deeply concentrating the mixed brine in the comprehensive regulating tank through an electrodialysis system, allowing concentrated water to enter an MVR system for evaporation and crystallization, and returning fresh water to a production system for recycling; the water amount entering the MVR system is 40 to 70 percent lower than that of the direct MVR evaporation process; the heavy metal content in the mixture solid salt of the sodium chloride, the sodium sulfate and the sodium nitrate after evaporation is low, and the solid salt can be used for snow melting agents, leather processing and dyeing and finishing industries;
d, the volume ratio of the feeding desalting chamber and the concentration chamber of the electrodialysis in the step D is 1.5-2.5: 1; controlling the conductivity of the desalting chamber to be 15-55 ms/cm after the electrodialysis treatment; the recovery rate of the desalting chamber is controlled to be 30-60%, and the desalted water is used as supplementary water of an alkali liquor absorption liquid or supplementary water of other production sections; the content of heavy metal in the mixed salt obtained after MVR evaporation is lower than 0.01 percent.
The anode and the cathode of the electrolytic cell are porous mesh electrodes.
The electrolytic stirring of the electrolytic cell adopts mechanical stirring or gas-filled stirring, and the mixed mass transfer of the electrolyte is carried out by arranging an elevated tank or a forced circulation mode.
The gold smelting wastewater quality-based treatment method provided by the invention provides an optional clean utilization technology of precious metal smelting wastewater according to the characteristics of water quality components of wastewater with different properties and the principles of waste reclamation, reduction and reutilization, improves the clean production level of the whole industry, and has the following technical characteristics and beneficial effects:
(1) the method adopts a quality-based treatment process and carries out targeted treatment aiming at the characteristics of waste water with different properties in gold smelting.
(2) The method provided by the invention utilizes the acid-base characteristics of wastewater with different water qualities in the gold smelting production process to neutralize, can realize self-neutralization of the acid-base wastewater without adding reagents, and can realize precipitation and recovery of heavy metals.
(3) The water amount entering MVR can be obviously reduced by adopting electrodialysis concentration, 40-70% of wastewater can be recycled to the production process, and the production cost can be greatly reduced while the wastewater is recycled.
(4) The method of the invention adopts a quality-divided comprehensive treatment method for the gold smelting wastewater, reduces the content of COD and heavy metals in the wastewater, realizes the recycling of 40-70% of high-salt wastewater, greatly reduces the production cost, avoids the problems of high content of COD and ammonia nitrogen of condensed water in the traditional treatment process and the like, provides an efficient, clean and energy-saving treatment scheme for the treatment of similar high-salt wastewater in the non-ferrous metal smelting and chemical industry, and has simple equipment structure and low investment.
Drawings
FIG. 1 is a process flow block diagram of the gold smelting wastewater quality-based treatment method of the invention.
Detailed Description
The method for treating gold smelting wastewater according to the invention according to different qualities is further explained in detail with reference to the attached drawings and the specific embodiment.
As shown in figure 1, the quality-based treatment method of gold smelting wastewater comprises the following operation steps:
A. the extraction wastewater in the acidic wastewater is separately collected and treated, the extraction wastewater is pumped into a micro-electrolysis filler catalytic oxidation reaction tank, the micro-electrolysis catalytic oxidation technology is adopted, under the aeration condition, the flow rate is controlled and the reaction residence time is adjusted, so that the treated COD is 20-40 mg/L, and then the treated COD enters a comprehensive regulating tank;
the pH value of the extraction wastewater in the step A is 2.5-4.5; the microelectrolysis filler is a diatomite-based iron-carbon composite material, wherein the mass ratio of silicon dioxide is 15-30%, the mass ratio of iron is 30-60%, and the mass ratio of carbon is 10-55%, the microelectrolysis filler is prepared by roasting the microelectrolysis filler for 2-4 hours under the reducing atmosphere condition at the temperature of 1000-1500 ℃, and the specific surface area of the prepared filler is 500-1000 g/m2(ii) a The aeration condition is that the aeration intensity is 2-10 m3/m2H, the electrolytic retention time is 2-10 h;
B. mixing impurity-removing wastewater in acidic wastewater and reducing wastewater with alkaline liquor in alkaline wastewater, controlling acid-base neutralization reaction points by adjusting the flow of the opening of a valve in a linkage manner through an intelligent pH sensor, so that the pH of the mixed solution is 7.5-8.5, performing plate-and-frame filter pressing on the mixed solution, recovering copper hydroxide precipitate from filter residues, wherein the copper ion concentration of the filtrate is lower than 0.5mg/L, and feeding the filtrate into a comprehensive adjusting tank;
C. the treatment of the electrolyzed water in the alkaline wastewater is to supplement concentrated brine generated by an MVR system into the feed liquid so as to increase the concentration of chloride ions in the electrolyzed water, remove cyanide and ammonia nitrogen in an electrocatalytic oxidation reaction tank by adopting an electrochemical oxidation treatment mode so as to enable the cyanide and ammonia nitrogen to reach the discharge standard, buffer the discharge standard by a buffer tank and then pump the discharge standard into a comprehensive adjusting tank;
the volume ratio of the MVR supplementing concentrated salt water in the step C to the electrolyzed water is 10-30%; the electrocatalytic oxidation reaction tank comprises a power supply, a polar plate and an electrolytic tank, wherein the anode and the cathode of the electrolytic tank are porous mesh electrodes; the anode material of the electrolytic cell is a titanium-based anode, the anode coating is a mixture of graphene, ruthenium and iridium, the components of the anode coating are 5.0-10.0% of graphene, 50.0-75.0% of ruthenium and 15.0-25.0% of iridium by mass ratio, and the thickness of the coating is 1.5-10.0 mu m; the cathode of the electrolytic cell is a stainless steel cathode; carrying out electrolysis under stirring, wherein the electrolysis stirring is carried out by adopting mechanical stirring or aeration stirring, and the mixed mass transfer of the electrolyte is carried out in a mode of arranging an overhead tank or forced circulation, and the electrolysis working current density is 100-1000A/square meter; the temperature of an electrolytic system is 40-80 ℃; the electrolytic retention time is 2-8 h; the total cyanogen concentration in the feed liquid after the electrocatalytic oxidation treatment is lower than 0.5mg/L, and the ammonia nitrogen concentration is lower than 5 mg/L;
D. deeply concentrating the mixed brine in the comprehensive regulating tank through an electrodialysis system, allowing concentrated water to enter an MVR system for evaporation and crystallization, and returning fresh water to a production system for recycling; the water amount entering the MVR system is 40 to 70 percent lower than that of the direct MVR evaporation process; the heavy metal content in the mixture solid salt of the sodium chloride, the sodium sulfate and the sodium nitrate after evaporation is low, and the solid salt can be used for snow melting agents, leather processing and dyeing and finishing industries;
d, the volume ratio of the feeding desalting chamber and the concentration chamber of the electrodialysis in the step D is 1.5-2.5: 1; controlling the conductivity of the desalting chamber to be 15-55 ms/cm after the electrodialysis treatment; the recovery rate of the desalting chamber is controlled to be 30-60%, and the desalted water is used as supplementary water of an alkali liquor absorption liquid or supplementary water of other production sections; the content of heavy metal in the mixed salt obtained after MVR evaporation is lower than 0.01 percent.
Example 1
Treating the gold smelting wastewater in Henan with the extraction wastewater amount of 0.5-1.5 m3D, COD content 5.5-7.5 g/L, amount of reduction wastewater and impurity-removed wastewater 3.0-5.5 m3D, the content of copper ions is 3.5 g/L; the water amount of the alkali liquor is 2.5-4.5 m3D; the total cyanogen in the electrolyzed water is 860mg/L, and the ammonia nitrogen is 1500 mg/L. The extraction water enters a micro-electrolysis catalytic reaction tank, and the aeration intensity is controlled to be 3-5 m3/m2H, the retention time is 8h, and the COD content of the liquid after the reaction is 25 mg/L. MVR concentrated water with 25% volume of electrolyzed water is added into the electrolyzed water, the electro-oxidation current density is controlled to be 450A/m2, the stirring intensity is 60rpm, the electrolysis time is 3.5h, the total cyanogen concentration of the treated liquid is 0.1mg/L, and the ammonia nitrogen concentration is 1.5 mg/L. The pH value of the solution is about 8.0 after the reducing water, the impurity removing water and the alkaline liquor are mixed, the underflow slag is subjected to filter pressing by a plate-and-frame filter press to recover copper slag, the content of copper ions in the supernatant is 0.1mg/L, the supernatant is subjected to precise filtration by a ceramic membrane and then is pumped into an electrodialysis system, the volume ratio of a desalting chamber to a concentration chamber is 2: 1, and the conductivity of the desalted solution is controlled at 20 ms/cm. After treatment, the desalted water is used for supplementing the production water, the water amount entering an MVR evaporation system is reduced by 55 percent, the evaporated condensed water is reused for production, and the obtained mixed salt has low heavy metal contentAnd when the content is less than 0.01 percent, the additive can be used as an additive for a snow melt agent, leather processing and dyeing and finishing industry.
Example 2
Treating gold smelting plant of Fujian province, the extraction waste water amount is 2.5-3.5 m3D, COD content is 4.5-5.5 g/L, and the amount of the reduction wastewater and the impurity-removed wastewater is 5.0-7.5 m3D, the content of copper ions is 5.8g/L, and the water amount of the alkali liquor is 4.5-5.5 m3And d. The total cyanogen in the electrolyzed water is 810mg/L, and the ammonia nitrogen is 2800 mg/L. The extraction water enters a micro-electrolysis catalytic reaction tank, and the aeration intensity is controlled to be 5-8 m3/m2H, the retention time is 6h, and the COD content of the liquid after the reaction is 30 mg/L. Adding MVR concentrated water with 30% volume of electrolyzed water into the electrolyzed water, controlling the electro-oxidation current density to be 650A/m2, the stirring intensity to be 80rpm, the electrolysis time to be 4.5h, the total cyanogen concentration of the treated liquid to be 0.2mg/L, and the ammonia nitrogen concentration to be 2.5 mg/L. The pH value of the solution is about 8.0 after the reducing water, the impurity removing water and the alkaline liquor are mixed, the underflow slag is subjected to filter pressing by a plate-and-frame filter press to recover copper slag, the content of copper ions in the supernatant is 0.2mg/L, the supernatant is subjected to precise filtration by a ceramic membrane and then is pumped into an electrodialysis system, the volume ratio of a desalting chamber to a concentration chamber is 2.5: 1, and the conductivity of the desalting solution is controlled at 30 ms/cm. After treatment, the desalted water is used for supplementing the production water, the water amount entering an MVR evaporation system is reduced by 60%, the evaporated condensed water is reused for production, the content of heavy metal in the obtained mixed salt is lower than 0.01%, and the mixed salt can be used as an additive for a snow melting agent, leather processing and dyeing and finishing industries.
Example 3
In a gold smelting plant in the north, the extraction waste water amount is 5.5-7.5 m3D, COD content is 1.5-2.5 g/L, and the amount of the reduction wastewater and the impurity-removed wastewater is 8.0-10.0 m3D, the content of copper ions is 4.5g/L, and the water amount of the alkali liquor is 7.5-10.5 m3And d. The total cyanogen in the electrolyzed water is 450mg/L, and the ammonia nitrogen is 900 mg/L. The extraction water enters a micro-electrolysis catalytic reaction tank, and the aeration intensity is controlled to be 2-5 m3/m2H, the retention time is 4h, and the COD content of the liquid after the reaction is 20 mg/L. Adding MVR concentrated water with the volume of electrolyzed water being 20% into the electrolyzed water, controlling the electro-oxidation current density to be 500A/m2, the stirring intensity to be 50rpm, the electrolysis time to be 4.5h, the total cyanogen concentration of the treated liquid to be 0.1mg/L, and the ammonia nitrogen concentration to be 0.5 mg/L. Mixing the reducing water, the impurity-removed water and the alkaline liquorThe pH value of the solution is about 8.5, the underflow slag is subjected to filter pressing through a plate-and-frame filter press to recover copper slag, the content of copper ions in the supernatant is 0.1mg/L, the copper ions are precisely filtered through a ceramic membrane and then pumped into an electrodialysis system, the volume ratio of a desalting chamber to a concentration chamber is 2.0: 1, and the conductivity of the desalted liquid is controlled at 50 ms/cm. After treatment, the desalted water is used for supplementing the production water, the water amount entering an MVR evaporation system is reduced by 65%, the evaporated condensed water is reused for production, the content of heavy metal in the obtained mixed salt is lower than 0.01%, and the mixed salt can be used as an additive for a snow melting agent, leather processing and dyeing and finishing industries.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. Accordingly, it will be apparent to those skilled in the art that various substitutions and modifications can be made without departing from the spirit of the invention, and all changes in performance or use that come within the meaning of the claims are to be considered as being embraced by the invention.

Claims (3)

1. A quality-based treatment method for gold smelting wastewater is characterized by comprising the following steps: the method comprises the following operation steps:
A. the extraction wastewater in the acidic wastewater is separately collected and treated, the extraction wastewater is pumped into a micro-electrolysis filler catalytic oxidation reaction tank, the micro-electrolysis catalytic oxidation technology is adopted, under the aeration condition, the flow rate is controlled and the reaction residence time is adjusted, so that the treated COD is 20-40 mg/L, and then the treated COD enters a comprehensive regulating tank;
the pH value of the extraction wastewater in the step A is 2.5-4.5; the microelectrolysis filler is a diatomite-based iron-carbon composite material, wherein the mass ratio of silicon dioxide is 15-30%, the mass ratio of iron is 30-60%, and the mass ratio of carbon is 10-55%, the microelectrolysis filler is prepared by roasting the microelectrolysis filler for 2-4 hours under the reducing atmosphere condition at the temperature of 1000-1500 ℃, and the specific surface area of the prepared filler is 500-1000 g/m2(ii) a The aeration condition is that the aeration intensity is 2-10 m3/m2H, the electrolytic retention time is 2-10 h;
B. mixing impurity-removing wastewater in acidic wastewater and reducing wastewater with alkaline liquor in alkaline wastewater, controlling acid-base neutralization reaction points by adjusting the flow of the opening of a valve in a linkage manner through an intelligent pH sensor, so that the pH of the mixed solution is 7.5-8.5, performing plate-and-frame filter pressing on the mixed solution, recovering copper hydroxide precipitate from filter residues, wherein the copper ion concentration of the filtrate is lower than 0.5mg/L, and feeding the filtrate into a comprehensive adjusting tank;
C. the treatment of the electrolyzed water in the alkaline wastewater is to supplement concentrated brine generated by an MVR system into the feed liquid so as to increase the concentration of chloride ions in the electrolyzed water, remove cyanide and ammonia nitrogen in an electrocatalytic oxidation reaction tank by adopting an electrochemical oxidation treatment mode so as to enable the cyanide and ammonia nitrogen to reach the discharge standard, buffer the discharge standard by a buffer tank and then pump the discharge standard into a comprehensive adjusting tank;
the volume ratio of the MVR supplementing concentrated salt water in the step C to the electrolyzed water is 10-30%; the electrocatalytic oxidation reaction tank comprises a power supply, a polar plate and an electrolytic tank, wherein the anode and the cathode of the electrolytic tank are one of plate-shaped or porous net-shaped; the anode material of the electrolytic cell is a titanium-based anode, the anode coating is a mixture of graphene, ruthenium and iridium, the components of the anode coating are 5.0-10.0% of graphene, 50.0-75.0% of ruthenium and 15.0-25.0% of iridium by mass ratio, and the thickness of the coating is 1.5-10.0 mu m; the cathode of the electrolytic cell is a stainless steel cathode; carrying out electrolysis under stirring, wherein the electrolysis working current density is 100-1000A/square meter; the temperature of an electrolytic system is 40-80 ℃; the electrolytic retention time is 2-8 h; the total cyanogen concentration in the feed liquid after the electrocatalytic oxidation treatment is lower than 0.5mg/L, and the ammonia nitrogen concentration is lower than 5 mg/L;
D. deeply concentrating the mixed brine in the comprehensive regulating tank through an electrodialysis system, allowing concentrated water to enter an MVR system for evaporation and crystallization, and returning fresh water to a production system for recycling; the water amount entering the MVR system is 40 to 70 percent lower than that of the direct MVR evaporation process; the heavy metal content in the mixture solid salt of the sodium chloride, the sodium sulfate and the sodium nitrate after evaporation is low, and the solid salt can be used for snow melting agents, leather processing and dyeing and finishing industries;
d, the volume ratio of the feeding desalting chamber and the concentration chamber of the electrodialysis in the step D is 1.5-2.5: 1; controlling the conductivity of the desalting chamber to be 15-55 ms/cm after the electrodialysis treatment; the recovery rate of the desalting chamber is controlled to be 30-60%, and the desalted water is used as supplementary water of an alkali liquor absorption liquid or supplementary water of other production sections; the content of heavy metal in the mixed salt obtained after MVR evaporation is lower than 0.01 percent.
2. The quality-divided treatment method of the gold smelting wastewater as claimed in claim 1, which is characterized in that: the anode and the cathode of the electrolytic cell are porous mesh electrodes.
3. The quality-divided treatment method of the gold smelting wastewater as claimed in claim 1, which is characterized in that: the electrolytic stirring of the electrolytic cell adopts mechanical stirring or gas-filled stirring, and the mixed mass transfer of the electrolyte is carried out by arranging an elevated tank or a forced circulation mode.
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