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Double-circulation jetting type heavy metal removing method and device

A spray-type, heavy metal technology, which is applied in chemical instruments and methods, metallurgical wastewater treatment, water/sewage multi-stage treatment, etc., can solve the problems of heavy metal sulfide removal, non-recyclable resources, hydrogen sulfide pollution and other problems. Achieve the effect of low cost, convenient management and high removal rate of heavy metals

Active Publication Date: 2013-02-13
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a dual-cycle injection method for the existing sulfide precipitation method to remove heavy metal sulfide with a large amount of sulfide, the removal rate is not high, a large amount of hydrogen sulfide that pollutes the environment is produced, the process is complicated, and resources cannot be recycled. Method and equipment for removing heavy metals

Method used

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  • Double-circulation jetting type heavy metal removing method and device
  • Double-circulation jetting type heavy metal removing method and device
  • Double-circulation jetting type heavy metal removing method and device

Examples

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Effect test

Embodiment 1

[0018] Take 1 cubic meter of wastewater (the wastewater is arsenic-containing wastewater from a sulfuric acid plant, with an acid content of 2.53% and an arsenic content of 1.15%), and use a double-cycle jetting type heavy metal removal device with a cycle temperature of 40°C, a cycle time of 60 minutes, and a reaction pressure of 0.2 MPa. After the reaction, the arsenic content was 0.0002% (2ppm), the arsenic removal rate reached 99.98%, and 22.62Kg of dry residue was obtained, and the arsenic content in the dry residue was 34.53%

Embodiment 2

[0020] 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 heavy metal removal device is used, with a cycle temperature of 40°C, a cycle time of 90 minutes, and a reaction pressure of 0.2 MPa. After the reaction, the arsenic content was 0.0004% (4ppm), the removal rate of arsenic reached 99.98%, and 39.71Kg of dry residue was obtained, and the arsenic content in the dry residue was 34.53%

Embodiment 3

[0022] Take 1 cubic meter of lead-acid battery wastewater (the total lead in the wastewater is 140.2mg / L, the total cadmium is 88.3mg / L, pH1.8), and a double-cycle jetting heavy metal removal device is used. The cycle temperature is 40°C and the cycle time is 90 minutes. The pressure is 0.2Mpa. After the reaction, the total lead content in the filtrate was 1.26mg / L, the total cadmium content was 0.44mg / L, the lead removal rate reached 99.1%, and the cadmium removal rate reached 99.5%.

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Abstract

The invention provides a double-circulation jetting type heavy metal removing method and device. Hydrogen sulfide enters a reaction kettle (3) through a pipeline from a hydrogen sulfide storage tank, and a circulation pump (5) is started so that materials in the reaction kettle (3) are subjected to internal circulation; meanwhile, residual hydrogen sulfide of the reaction kettle (3) enters a reaction kettle (4), and a circulation pump (6) is started so that materials in the reaction kettle (4) are subjected to internal circulation; and after reaction is carried out for 60-90min, reacted liquid in the reaction kettle (3) is arranged in a storage tank through a pipeline to stand for 30-60min, the liquid is filtered in a pressing manner to obtain filter residue, the filter residue can be transferred to a smelting plant for recycling heavy metals, and filtrate is comprehensively applied to other workshop sections to realize zero emission; and waste liquid in the reaction kettle (4) is reserved to be served as reaction liquid of the reaction kettle (3) in next turn.

Description

technical field [0001] The invention relates to a method and equipment for removing heavy metals by double-circulation jetting, and belongs to the fields of waste water treatment and environmental protection. Background technique [0002] Metallurgical industry, mining industry, electroplating industry, battery processing industry, mechanical processing, chemical industry and other industries produce a large amount of wastewater in the production process. The wastewater contains extremely high concentrations of harmful heavy metals. These heavy metals are extremely toxic and have the most significant biotoxins. Including mercury (Hg), chromium (Cr), cadmium (Cd), lead (Pb) and metalloid arsenic (As), as well as zinc (Zn), copper (Cu), nickel (Ni) and other elements with certain toxicity. These heavy metals can cause biological dysfunction, nutritional disorders, and even death in animals and plants. Therefore, the wastewater produced by these industries must be treated to r...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16C02F101/20
Inventor 黎铉海曹传东杜晓娟陈勇高祖玉李荣胜蒋书霞
Owner GUANGXI UNIV
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