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Method for comprehensively utilizing arsenious waste liquor produced in copper-smelting process

A waste liquid and copper smelting technology, which is applied in the field of comprehensive utilization of industrial waste liquid, can solve the problems of a large amount of hazardous waste, occupying land resources, secondary pollution, etc., and achieve the effects of low cost, improving economic benefits, and reducing land occupation

Inactive Publication Date: 2013-04-10
林建忠
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Problems solved by technology

However, this method has the following defects: one is that the lime resources to be consumed in the disposal process will generate a large amount of hazardous waste; Pollution requires secondary treatment; the third is to build a special storage site for stacking hazardous waste, which requires a large amount of investment and occupies land resources; fourth, the useful substances contained in the waste liquid are disposed of together, resulting in waste of resources

Method used

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Embodiment

[0017] Below in conjunction with embodiment the present invention is further described:

[0018] Take 1 m of waste liquid for purification in the first step 3 Copper smelting enterprises use the sulfur dioxide gas produced by pyrometallurgy to produce acid, and the arsenic-containing waste liquid formed is filtered through a filter press to remove solids and injected into the enamel reaction kettle; the acidity of the waste liquid is 12%, and the arsenic-containing The amount is 23000mg / L.

[0019] In the second step, magnesium addition reaction adds 70 kg of 80% magnesium oxide, and stirs for 20 minutes with a stirring paddle, so that the pH value of the liquid is >5.

[0020] The third step is to separate the liquid and filter the liquid with a filter press to obtain 0.9m 3 MgSO4 solution and 130kg filter residue.

[0021] The fourth step is to purify Mg3(AsO4)2. Put the filter residue into the elutriation tank, add 100kg of water for elutriation, and dissolve the residua...

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Abstract

A method for comprehensively utilizing arsenious waste liquor produced in a copper-smelting process. The method comprises the following steps: adding magnesium oxide to raw material which is the arsenious waste liquor formed during the production process of fire copper-smelting enterprises, reacting to obtain MgSO4 solution and Mg3(AsO4)2 filter residues; purifying the Mg3(AsO4)2 filter residues, drying and grinding to obtain a magnesium arsenate product; concentrating the MgSO4 solution to a saturation state to separate solid As2O3 out, purifying and drying to obtain an arsenic trioxide product; crystallizing the MgSO4 solution, purifying to remove the residual As2O3, so as to obtain a magnesium sulfate heptahydrate product; and roasting the magnesium arsenate product, collecting smoke which is generated during roasting, cooling to obtain the arsenic trioxide product, and collecting the roasted residues to finally obtain a magnesium oxide product. The method is simple in process, realizes the comprehensive utilization of the arsenious waste liquor with small investment, reaches the effects of energy saving and emission reduction and has a resource recovery effect.

Description

technical field [0001] The invention is a comprehensive utilization method of industrial waste liquid. It specifically relates to the copper smelting industry, a method for the comprehensive utilization of arsenic-containing waste liquid formed by copper smelting enterprises in the process of using sulfur dioxide gas produced by pyrometallurgy to produce acid. Background technique [0002] Most of arsenic and its compounds are highly toxic substances and are easy to cause cancer. They are harmful to the human body and the environment, and belong to the first class of pollutants stipulated by the state. At present, a large amount of arsenic-containing waste liquid is produced in the production process of copper smelting enterprises. If it cannot be disposed of safely, it will cause environmental pollution and threaten public health. [0003] For the arsenic-containing waste liquid in the production process of copper smelting enterprises, lime is currently used to neutralize ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/46C02F1/56C22B30/04C22B26/22C02F101/10C02F103/16
CPCY02P10/20
Inventor 林建忠
Owner 林建忠
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