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Method for removing arsenic by double-circulation injection in sulfuric acid industry

A spray-type, double-cycle technology, applied in chemical instruments and methods, water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of non-recyclable resources, environmental pollution of hydrogen sulfide, large amount of sulfide, etc. , to achieve the effect of pollution-free clean production process, small footprint and less slag

Inactive Publication Date: 2016-04-27
GUANGXI NANNING DHXY ENTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problems of the existing sulfide precipitation method for the removal of arsenic-containing wastewater from sulfuric acid plants, such as the large amount of sulfide used, the low removal rate, the production of a large amount of hydrogen sulfide that pollutes the environment, the complicated process, and the inability to recycle resources. Method and equipment for arsenic removal by double-cycle injection

Method used

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  • Method for removing arsenic by double-circulation injection in sulfuric acid industry
  • Method for removing arsenic by double-circulation injection in sulfuric acid industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 1 cubic meter of waste water (the waste water is arsenic-containing waste water from a sulfuric acid plant, the acid content is 2.53%, and the arsenic content is 1.15%), and a double-cycle jetting type heavy metal removal device is adopted, the amount of sodium sulfide is 120% of the theoretical amount, and the circulation temperature is 40°C , The cycle time is 60 minutes, and the reaction pressure is 0.2Mpa. After the reaction, the arsenic content is 0.0002% (2ppm), the arsenic removal rate reaches 99.98%, and 22.62Kg of dry residue is obtained, and the arsenic content in the dry residue is 34.53%.

Embodiment 2

[0031] Take 1 cubic meter of waste water (the waste water is arsenic-containing waste water from a sulfuric acid plant, the acid content is 2.53%, and the arsenic content is 2.29%), and a double-cycle jetting type heavy metal removal device is used. The amount of sodium sulfide is 120% of the theoretical amount, and the circulation temperature is 40 ° C. , The cycle time is 90 minutes, and the reaction pressure is 0.2Mpa. After the reaction, the arsenic content was 0.0004% (4ppm), the arsenic removal rate reached 99.98%, and 39.71Kg of dry residue was obtained, and the arsenic content in the dry residue was 34.53%.

Embodiment 3

[0033] Take 1 cubic meter of waste water (the waste water is arsenic-containing waste water from a sulfuric acid plant, the acid content is 6.03%, and the arsenic content is 1.05%), and a double-cycle jetting type heavy metal removal device is used, the amount of sodium sulfide is 120% of the theoretical amount, and the circulation temperature is 40°C , The cycle time is 60 minutes, and the reaction pressure is 0.2Mpa. After the reaction, the arsenic content is 0.0005% (5ppm), the arsenic removal rate reaches 99.99%, and 20.71Kg of dry residue is obtained, and the arsenic content in the dry residue is 32.03%.

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Abstract

The invention provides a double-circulation spraying type arsenic removal method and equipment for sulfuric acid plants. Vulcanizing agents are placed in a hydrogen sulfide generator, generated hydrogen sulfide enters a reaction kettle (3) through a pipeline, and a circulation pump (5) is opened so that materials in the reaction kettle (3) carry out internal circulation; and meanwhile, the rest hydrogen sulfide of the reaction kettle (3) enters a reaction kettle (4), and a circulation pump (6) is opened so that the materials in the reaction kettle (4) carry out internal circulation. After the reaction is carried out for 60 to 90 minutes, liquid after reaction in the reaction kettle (3) is placed in a storage tank through a pipeline, the still standing is carried out for 30 to 60 minutes, the liquid is subjected to filter pressing, the obtained filter slag can be conveyed to a smelting plant for heavy metal recovery, the filter liquid is directly discharged, and waste liquid of the reaction kettle (4) is left to be used as the subsequent reaction liquid of the reaction kettle (3). The method and the equipment have the advantages that the arsenic removal rate can reach higher than 99 percent, the arsenic content of the filter slag is high, and the deep processing is favorably realized.

Description

technical field [0001] The invention relates to a method and equipment for removing heavy metals of waste acid water in a sulfuric acid plant by double-circulation jetting, and belongs to the fields of waste water treatment and environmental protection. Background technique [0002] In the process of sulfuric acid production, pyrite is widely used as raw material for roasting, and a large amount of arsenic-containing wastewater will be produced in the process of washing and purifying furnace gas. A large amount of arsenic in wastewater seriously pollutes the environment and endangers people's life and health, and the wastewater contains a variety of heavy metal ions, which further increases its harm. How to economically and effectively treat the arsenic-containing waste acid in sulfuric acid production plants is a difficult problem to be solved urgently by many sulfuric acid production plants. [0003] At present, there are many methods for treating acidic arsenic-containin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/62
Inventor 曹传东黎铉海高祖玉李荣胜杜晓娟陈勇蒋书霞
Owner GUANGXI NANNING DHXY ENTECH
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