Comprehensive utilization method for arsenic and acid wastewater

The technology of polluted acid wastewater and arsenic polluted acid is applied in the directions of arsenic compounds, chemical instruments and methods, and the improvement of process efficiency, which can solve the problems of secondary pollution, the generation of arsenic-containing waste residues, and the high treatment cost, so as to save the treatment cost, The effect of improving the recovery rate and lowering the treatment cost

Inactive Publication Date: 2019-06-14
云南省环境科学研究院(中国昆明高原湖泊国际研究中心)
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Problems solved by technology

[0004] At present, domestic treatment of arsenic-containing wastewater mainly includes lime neutralization precipitation method, sulfide precipitation method, iron salt oxidation to remove arsenic, extraction method, ion exchange method, adsorption method, etc. Extraction method, ion exchange method, and adsorption method are mainly used to treat low concentration. Arsenic-containing wastewater, but the process is complicated, the treatment cost is high, and there are few industrial applications
Lime neutralization precipitation method, sulfide precipitation method, and iron salt oxidation arsenic removal method are currently more commonly used methods for treating arsenic-containing sewage acid wastewater. The amount of slag is large, and it is easy to cause secondary pollution. The sulfuric acid in the polluted acid wastewater is wasted due to neutralization. At the same time, valuable elements and arsenic enter the waste slag and cannot be used. Discharge will pay environmental protection tax in the future; at present, the most commonly used method in the treatment of arsenic-containing sewag

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  • Comprehensive utilization method for arsenic and acid wastewater

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Effect test

Embodiment 1

[0040] The arsenic-containing polluted acid wastewater produced by copper smelting in an Isa furnace has a sulfuric acid concentration of 149.47g / L, of which the arsenic content is 23.9g / L. It is evaporated by two-stage heating, and the sulfuric acid content after mixing the two-stage concentrate is 1736.37g / L , the arsenic content of the distilled water evaporated in the second stage is 94mg / L, the concentrated solution is cooled and crystallized, and the purity is obtained through filtration and separation to obtain arsenic trioxide with a purity of 98.76%. , containing 7.6% zinc) according to the ratio of 1L / kg and stirred evenly, after mixing evenly, place it in a tube furnace for roasting for 60min at a roasting temperature of 300°C, use a bag dust collector to collect the smoke generated by roasting, and use sodium hydroxide to absorb the tail gas After roasting, the calcine contains 0.8% arsenic, and the dust contains 96.3% arsenic. The calcine is leached by sulfuric aci...

Embodiment 2

[0042] The arsenic-containing waste acid wastewater produced by an Osmelt furnace copper smelting enterprise has a sulfuric acid content of 126.3g / L, of which the arsenic content is 13.9g / L. The polluted acid is evaporated by primary heating, the concentrated sulfuric acid content is 1675.2g / L, the concentrated acid is cooled and crystallized, solid-liquid separation and drying to obtain arsenic trioxide with a purity of 99%, and the filtered concentrated sulfuric acid and arsenic-containing smoke ( Arsenic 5.7%, zinc 11.2%) were mixed evenly at a ratio of 0.5L / kg, and the mixed material was added to a tube furnace for roasting for 90 minutes at a roasting temperature of 350 degrees Celsius, and dust was collected from the roasting flue gas with a cloth bag to obtain arsenic containing 98.4 % of arsenic trioxide, the baked sand is ground and soaked in water, and the leaching rate of zinc reaches 81%. Mix the arsenic trioxide obtained in Examples and Examples with charcoal, put...

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Abstract

The invention discloses a comprehensive utilization method for arsenic and acid wastewater, Arsenic and acid wastewater generated by nonferrous metallurgy and sulfuric acid industries is used as a process object, prereduction, evaporation and concentration are conducted, after concentrated liquid is cooled, trivalent arsenic is crystallized in the form of arsenic trioxide, through filtration separation and drying, arsenic trioxide is obtained, the evaporating liquid is condensed and reused, filtered concentrated acid and arsenic-containing soot are mixed for briquetting, sulfatizing roasting is conducted, arsenic trioxide in soot is recovered and used as a crude white product or further reduced for preparing metal arsenic with the crystallized arsenic trioxide, generated roasting sand is subjected to wet leaching, and valuable metal is extracted. Waste acid does not need to be neutralized, arsenic-containing waste slag is not generated, waste is controlled through waste, comprehensiverecycling of all elements of valuable components is achieved, meanwhile, the process is short, operation is simple, the treatment cost is low, the economic benefits are considerable, and the problem of acid wastewater treatment in the industry can be solved.

Description

technical field [0001] The invention belongs to the technical field of heavy metal polluted acid wastewater treatment, specifically a method for comprehensive utilization of arsenic-containing polluted acid wastewater, which can solve the traditional problem of neutralizing arsenic to produce a large amount of arsenic-containing hazardous waste, and realize the transformation of arsenic elements from waste to treasure At the same time, the concentrated sulfuric acid produced can be comprehensively utilized to further realize the dearsenization of arsenic-containing materials and recover valuable metals. Background technique [0002] Arsenic and its compounds seriously damage human health, and have been identified as the first class of carcinogens by the US Centers for Disease Control and National Cancer Research Institute, mainly endangering human health through drinking water. Therefore, China, the United States, Western Europe, Japan and many other countries have listed ar...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/06C22B30/04C01G28/00C01B19/02C22B19/20C22B13/00C22B58/00C22B41/00C22B11/00
CPCY02P10/20
Inventor 王统吴文卫陈晨杨子轩张涛毕廷涛王舒婷吴咪娜孙晶
Owner 云南省环境科学研究院(中国昆明高原湖泊国际研究中心)
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