Mine acid wastewater utilization and deep purification method

A technology for deep purification of mine acid wastewater, applied in chemical instruments and methods, zinc sulfate, multi-stage water treatment, etc., can solve problems such as being unsuitable for high-concentration acid wastewater treatment, poor metal ion tolerance, and low treatment efficiency. , to achieve the effect of simple facilities, reduced environmental risks, and efficient enrichment

Active Publication Date: 2016-03-30
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The microbial treatment of acidic mine wastewater by using sulfate-reducing bacteria has the advantages of low cost, strong applicability, no secondary pollution, and recyclable valuable components....

Method used

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  • Mine acid wastewater utilization and deep purification method

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Experimental program
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Effect test

Embodiment 1

[0030] The sample was taken from the raffinate wastewater of a gold and copper mine smelting company, with an acidity of 0.33mol / L, a copper ion content of 85mg / L, a zinc ion content of 204mg / L, and a total iron ion content of 8.6g / L. Follow the steps below:

[0031] 1) Use a neutralizer to adjust the pH value of the acidic mine wastewater to 2.2, and then separate the solid and liquid to obtain gypsum;

[0032] 2) Use a neutralizer to adjust the pH value of the acidic mine wastewater to 3.2, remove iron ions, and recover iron slag;

[0033] 3) adding a vulcanizing agent to the solution after iron removal to obtain copper-zinc slag;

[0034] 4) Copper-zinc slag is separated to obtain copper-rich slag and zinc sulfate solution after acid leaching, and reclaims vulcanizing agent;

[0035] 5) Advanced treatment of the final effluent.

[0036] The neutralizing agent of steps 1) and 2) is calcium carbonate.

[0037] In step 3), the molar ratio of vulcanizing agent sodium sulfid...

Embodiment 2

[0042] The sample was taken from the raffinate wastewater B / D of a gold and copper mine smelting company, with an acidity of 0.41mol / L, a copper ion content of 584mg / L, a zinc ion content of 216mg / L, and a total iron ion content of 8.3g / L. Follow the steps below:

[0043] 1) Use a neutralizer to adjust the pH value of the mine acid wastewater to 2.4, and then separate the solid and liquid to obtain gypsum;

[0044] 2) Use a neutralizer to adjust the pH value of the mine acid wastewater to 3.0, remove iron ions, and recover iron slag;

[0045] 3) adding a vulcanizing agent to the solution after iron removal to obtain copper-zinc slag;

[0046] 4) Copper-zinc slag is separated to obtain copper-rich slag and zinc sulfate solution after acid leaching, and reclaims vulcanizing agent;

[0047] 5) Advanced treatment of the final effluent.

[0048] The neutralizing agent in step 1) and 2) is calcium carbonate, sodium carbonate, magnesium carbonate, calcium oxide, magnesium oxide. ...

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Abstract

The invention relates to a mine acid wastewater utilization and deep purification method which comprises the following steps: (1) adjusting the pH value of mine acid wastewater using a neutralizer to recover gypsum; (2) recovering iron through two-stage neutralization; (3) recovering copper and zinc through an efficient vulcanization reaction; (4) leaching the copper and zinc residue with acid and separating copper and zinc to obtain a zinc sulfate solution and copper-rich residue; recovering the vulcanizing agent; drying the zinc sulfate solution by an MVR technology to prepare zinc sulfate; and applying the vulcanizing agent to the step (3) for the efficient vulcanization reaction; and (5) performing deep treatment and reusing the effluent or discharging when the effluent reaches the standard. By adopting the method, the recovery efficiency of copper in the mine acid wastewater can reach 85% or more, and the recovery rate of zinc is 95% or over while high-purity gypsum can be produced at the same time; compared with traditional technology, the residue quantity can be reduced by 20% or over, and the utilization of the mine acid wastewater is realized; and the new technology has the advantages of efficient purification and low cost and brings remarkable economic and environmental benefits.

Description

technical field [0001] The invention relates to a waste water treatment process, in particular to a mine acid waste water recycling and deep purification method. It is suitable for the treatment of acidic wastewater produced in copper sulfide mining and biological wet copper extraction process. Background technique [0002] In the process of copper sulfide mining and biological wet copper extraction, the main characteristics of the mine acid wastewater are low pH value, many types of metal ions, high concentration of copper, zinc, iron and sulfate, and low pH value. In 1.6, the iron ion content is higher than 7g / L, the sulfate radical concentration reaches 20g / L, and the copper and zinc ion content is 90-300mg / L. If the acidic mine wastewater is discharged into the farmland, the crops will turn yellow and the soil will be salinized; if it is discharged into the water body, it will harm fish and other aquatic organisms, and harm the human body through the food chain. [000...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01G9/06
CPCC01G9/06C02F1/04C02F1/26C02F1/66C02F9/00C02F2301/08
Inventor 柴立元蒋国民王庆伟李青竹杨志辉高伟荣
Owner CENT SOUTH UNIV
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