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Method for treating high-arsenic high-iron acid wastewater and recovering copper and iron

A technology for acidic wastewater and copper recovery, applied in water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve the problems of harsh operating conditions and high cost

Active Publication Date: 2021-07-06
YUNNAN GOLD MINING GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has strict requirements on equipment, membranes and operating conditions; membranes with a negatively charged barrier layer are effective for the removal of AS(V), but are not as effective for the removal of As(Ⅲ) that exists in the water body in an electrically neutral form. Not ideal, the raw water needs to be pre-oxidized, and the cost is very high

Method used

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  • Method for treating high-arsenic high-iron acid wastewater and recovering copper and iron
  • Method for treating high-arsenic high-iron acid wastewater and recovering copper and iron

Examples

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Effect test

Embodiment 1

[0051] A metal smelting acid wastewater containing arsenic, iron and other metals, the pH of the solution is about 2, the main harmful element analysis results are: total arsenic 850.65mg / L, iron 8120.45mg / L, copper 1826.85mg / L, Contains lead 5.26mg / L, also contains a small amount of zinc.

[0052] Using the present invention to treat the metal smelting acid waste water containing arsenic, iron and other metals, the implementation technical scheme includes:

[0053] (1) Detection of arsenic and heavy metal content in metal smelting wastewater. Take a certain amount of arsenic-containing and heavy metal wastewater from metal smelting to be treated, and measure the content of arsenic, copper, lead, iron and other elements respectively;

[0054] (2) Arsenic removal treatment. 1# Pond 1 contains arsenic-containing acidic wastewater pumped to the arsenic-removing mixing tank 3, then add 10% lime emulsion into the arsenic-removing mixing tank 3, the pH value is controlled at 3, th...

Embodiment 2

[0059] A metal smelting acid wastewater containing arsenic, iron and other metals, the pH of the solution is about 0.9, the main harmful element analysis results are: total arsenic 1521.74mg / L, iron 12362.32mg / L, copper 2765.38mg / L, Contains lead 7.26mg / L, also contains a small amount of zinc.

[0060] Using the present invention to treat the metal smelting acid waste water containing arsenic, iron and other metals, the implementation technical scheme includes:

[0061] (1) Detection of arsenic and heavy metal content in metal smelting wastewater. Take a certain amount of arsenic-containing and heavy metal wastewater from metal smelting to be treated, and measure the content of arsenic, copper, lead, iron and other elements respectively;

[0062] (2) Arsenic removal treatment. 1# Pool 1 contains arsenic-containing acidic wastewater pumped to the arsenic-removing mixing tank 3, and then add 10% lime emulsion into the arsenic-removing mixing tank. The pH value is controlled at...

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Abstract

The invention relates to a method for treating high-arsenic and high-iron acid wastewater and recovering copper and iron, and belongs to the field of hydrometallurgy. The method comprises the following steps: adding a lime emulsion to control the PH value of the acid wastewater according to the property of different PH value ranges of hydroxide precipitates, removing arsenic, trivalent iron ions and lead under the condition that the low PH value is 3-3.5, adding sulfuric acid to impurities-removed wastewater to adjust the PH value to be 1.5-2, then using iron powder for copper replacement, carrying out solid-liquid separation after copper elementary substances are formed, and recycling copper; and adding a certain amount of hydrogen peroxide into the liquid to oxidize divalent iron ions in the liquid into trivalent iron ions, then adding a certain amount of sodium hydroxide solution to form ferric hydroxide precipitate, then carrying out solid-liquid separation, and recovering ferric hydroxide. The treated wastewater can meet the requirement for utilization of production return water, and meanwhile environmental pollution is reduced.

Description

technical field [0001] The invention relates to a method for treating high-arsenic and high-iron acidic wastewater and recovering copper and iron, which belongs to the field of hydrometallurgy and relates to the technical field of treatment of acidic arsenic-containing wastewater generated in the production process of metal smelting enterprises. Background technique [0002] At present, during the non-ferrous metal smelting process of metal smelting enterprises, a considerable part of arsenic enters the SO2 flue gas. The SO2 flue gas obtained from the roasting of metal sulfide ores is usually used to produce sulfuric acid. Before making acid, it is necessary to wash and purify the flue gas. Pollutants such as arsenic in the flue gas enter the solution to form acidic arsenic-containing wastewater. At the same time, some sulfide ore roasting slag contains gold, silver and other precious metals. It is necessary to cyanide leaching the sulfide ore roasting slag to recover gold ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/66C02F1/70C02F1/72C02F101/10C02F101/20
CPCC02F9/00C02F1/66C02F1/5236C02F1/722C02F1/705C02F2101/103C02F2101/203C02F2101/20Y02P10/20
Inventor 代生权高起方谢恩龙周东云姜亚雄
Owner YUNNAN GOLD MINING GRP