Recycling treatment method for high-salt gold smelting wastewater

A wastewater circulation and treatment method technology, which is applied in metallurgical wastewater treatment, water/sewage treatment, neutralization water/sewage treatment, etc., can solve the problems of high evaporation energy consumption, high salinity of production wastewater, poor biodegradability, etc., and achieve Reduce production costs, increase production costs, and achieve the effect of recycling

Active Publication Date: 2021-12-10
厦门紫金矿冶技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the gold refining process, hydrochloric acid and nitric acid are used to remove impurities and gold, sulfite reduction, extraction and removal of impurities, and acid mist purification. Therefore, the production wastewater has the characteristics of high salinity, high COD content, and poor biodegradability.
The existing wastewater treatment method usually adopts the process of "neutralization + flocculation sedimentation + MVR evaporation". Because of the high boiling point of nitrate in brine, the evaporation energy consumption of this process is large, and the cost per ton of water treatment is high. Thoroughly, resulting in high COD content of condensed water, which cannot be reused directly

Method used

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  • Recycling treatment method for high-salt gold smelting wastewater

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Effect test

Embodiment 1

[0024] A gold smelting wastewater, the daily comprehensive brine discharge is 15m 3 / d, wherein the content of sodium chloride is 35g / L, sodium nitrate is 28g / L, and sodium sulfate is 18g / L. like figure 1 As shown in the figure, after the brine is refined and filtered, it is pumped into the bipolar membrane electrolysis system for treatment, and the current density is controlled to 450A / m 2 , the electrolysis time is 3.5h. The anion membrane used in the bipolar membrane electrolysis system is a special anion exchange membrane that only allows monovalent anions to pass through. Under the action of an electric field, monovalent anions chloride ions and nitrate ions can pass through the ion membrane, while divalent sulfate ions cannot pass through the ion membrane. membrane. Acid receiving solution 9-15m 3 / d, the initial mass concentration is 1.0%, and the alkali receiving solution is 12-18m 3 / d, the initial mass concentration is 0.8%, acid (concentration 6%) and alkali (c...

Embodiment 2

[0026] A gold smelting wastewater in Fujian has a daily comprehensive brine discharge of 20-25m 3 / d, wherein the content of sodium chloride is 15g / L, sodium nitrate is 35g / L, and sodium sulfate is 25g / L. like figure 1 As shown in the figure, after the brine is refined and filtered, it is pumped into the bipolar membrane electrolysis system for treatment, and the current density is controlled to 1000A / m 2 , the electrolysis time is 3.0h. The anion membrane used in the bipolar membrane electrolysis system is a special anion exchange membrane that only allows monovalent anions to pass through. Under the action of an electric field, monovalent anions chloride ions and nitrate ions can pass through the ion membrane, while divalent sulfate ions cannot pass through the ion membrane. membrane. Acid receiving solution 12-20m 3 / d, the initial mass concentration is 2.0%, and the alkali receiving solution is 16-30m 3 / d, the initial mass concentration is 2.0%, the electrolysis prod...

Embodiment 3

[0028] A gold smelting wastewater in the north produces a comprehensive brine discharge of 50m per day 3 / d, wherein the content of sodium chloride is 40g / L, sodium nitrate is 30g / L, and sodium sulfate is 12g / L. like figure 1 As shown in the figure, after the brine is refined and filtered, it is pumped into the bipolar membrane electrolysis system for treatment, and the current density is controlled to 600A / m 2 , the electrolysis time is 5.0h. The anion membrane used in the bipolar membrane electrolysis system is a special anion exchange membrane that only allows monovalent anions to pass through. Under the action of an electric field, monovalent anions chloride ions and nitrate ions can pass through the ion membrane, while divalent sulfate ions cannot pass through the ion membrane. membrane. Acid receiving solution 40m 3 / d, the initial mass concentration is 0.5%, and the alkali receiving solution is 60m 3 / d, the initial mass concentration is 0.5%, the electrolysis prod...

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Abstract

The invention discloses a recycling treatment method for high-salt gold smelting wastewater. The method comprises the following specific steps: mixing extraction water, reduction water, impurity removal water and alkali liquor water which are generated in a gold refining process, and then carrying out refining treatment; taking the refined liquid as feed liquid to be pumped into a membrane electrolysis system to be treated, adding acid receiving liquid and alkali receiving liquid, regulating and controlling the current density and the electrolysis time, and preparing acid and alkali through electrolysis, wherein the generated acid is reused for the impurity removal and extraction section of gold, and the generated alkali is used for the desorption section of smelting tail gas purification liquid or gold-loaded activated carbon; adding a neutralizing reagent into the desalinated liquid obtained after electrolysis, controlling the pH value to be 7-8, directly discharging or recycling the obtained supernate, and directly selling the obtained underflow which is gypsum slag. According to the method, the recyclable acid liquor and alkali liquor are prepared through special electrolysis of the salt-containing wastewater, the desalinated liquor can be recycled or discharged after reaching the standard after being neutralized, a traditional MVR evaporation process is completely replaced, the production cost is greatly reduced, and wastewater recycling is achieved.

Description

technical field [0001] The invention relates to the technical field of green environmental protection and low-carbon and clean production, in particular to a recycling treatment method for high-salt gold smelting wastewater. Background technique [0002] In the gold refining process, hydrochloric acid and nitric acid are used for impurity removal, gold separation, sulfite reduction, extraction and impurity removal, and acid mist purification. Therefore, the production wastewater has the characteristics of high salinity, high COD content, and poor biodegradability. The existing wastewater treatment method usually adopts the process of "neutralization + flocculation sedimentation + MVR evaporation", because the boiling point of nitrate in the brine is high, the evaporation energy consumption of this process is large, the cost of water treatment per ton is high, and the residual extractant treatment is not easy. Thoroughly, the resulting condensed water with high COD content ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/20C02F101/30C02F103/16
CPCC02F9/00C02F1/46109C02F1/469C02F1/66C02F1/42C02F1/72C02F1/001C02F2101/20C02F2101/30C02F2103/16Y02P10/20
Inventor 季常青伍赠玲王乾坤林烽先孙根荣赖斌丘俊杰
Owner 厦门紫金矿冶技术有限公司
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