Method for treating acidic heavy metal wastewater and recycling treated wastewater

A waste water treatment and heavy metal technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve the effect of cost saving, small consumption, and high water quality elasticity

Active Publication Date: 2012-06-20
株洲三特环保节能股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of this patent is: aiming at the shortage of acid wastewater treatment and reuse treatment methods in the sulfuric acid purification process of smelting acid production, to propose a method that can make the acid wastewater treatment and reuse treatment production process of sulfuric acid purification process of smelting acid production do not produce gypsum Solid waste slag, reduced treatment costs, and all waste water can be truly returned to the smelting and sulfuric acid purification process Acid waste water treatment and reuse treatment methods to achieve zero discharge of waste water in the true sense

Method used

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  • Method for treating acidic heavy metal wastewater and recycling treated wastewater
  • Method for treating acidic heavy metal wastewater and recycling treated wastewater
  • Method for treating acidic heavy metal wastewater and recycling treated wastewater

Examples

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Embodiment example 1

[0038] This embodiment technological process is as follows:

[0039] 1) Input the acidic waste water from the sulfuric acid purification process of smelting acid production to the absorption tower circulation tank, in which the content of copper ions is 500 mg / L, the content of zinc ions is 500 mg / L, and the content of lead ions is 200 mg / L. The arsenic content is 3500 mg / L, the chloride ion content is 1000 mg / L, and the fluoride ion content is 1000 mg / L.

[0040] 2) Hydrogen sulfide gas is formed in the mixing tower, and sulfur gas and hydrogen gas are fed into the mixing tower to make sulfur gas and hydrogen gas synthesize hydrogen sulfide gas under the pressure of 0.1-1.2Mpa;

[0041] 3) Send the hydrogen sulfide gas synthesized in step 2) into the three-stage tower tank device for circulation, and vulcanize with the waste acid aqueous solution to be treated in the three-stage tower tank device:

[0042] 4) The unreacted trace amount of hydrogen sulfide gas after step 3) i...

Embodiment example 2

[0048] The acidic wastewater to be treated in the sulfuric acid purification process of smelting acid production is input into the circulation tank of the absorption tower, in which the content of copper ions is 300 mg / L, the content of zinc ions is 300 mg / L, the content of lead ions is 100 mg / L, and the content of arsenic is 1200 mg / L, the content of chloride ion is 300 mg / L, and the content of fluoride ion is 300 mg / L. The subsequent steps are the same as in Example 1. After analysis, the filtered filtrate contains copper, zinc, lead, and arsenic each ≤0.05 mg / L L, that is, the vulcanization efficiency is ≥99.8%, the chloride ion and the fluoride ion are each ≤0.5 mg / L, and the removal effect of fluorine and chlorine is ≥95%.

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Abstract

The invention relates to a method for treating acidic heavy metal wastewater and recycling the treated wastewater, comprising the following main steps of: forming hydrogen sulphide gas from sulphur gas and hydrogen in a mixing tower; charging the hydrogen sulphide gas in a multi-stage absorption tower to absorb; reacting all heavy metals in acidic solution to generate a sulphide precipitate; absorbing the trace hydrogen sulphide by alkaline solution to ensure no hydrogen sulphide gas contained in discharged gas; filtering the sulphide by a polytetrafluoroethylene membrane, and then perform pressure-filtering to convert the sulphide into a solid phase; and removing fluorine and chlorine from fluorine-containing and chlorine-containing wastewater via a fluorine and chlorine removal tower, and then returning the acidic solution to a purification tower or acid-making water. The process is more environment-friendly, without secondary pollution due to no generation of gypsum, high in treatment efficiency, and low in cost.

Description

technical field [0001] The invention relates to a treatment and recovery method of acid waste water, in particular to a treatment and recovery method of acid waste water in the sulfuric acid purification process of smelting acid production, and belongs to the field of nonferrous metallurgy acid production. Background technique [0002] During the copper-lead-zinc smelting process, a large amount of flue gas will be produced, including a large amount of SO2 and some harmful metal components. From the perspective of environmental protection and comprehensive utilization, most lead-zinc smelters have built two-to-two-suction acid production systems to realize soot recovery and SO2 production of sulfuric acid. However, in this process, a large amount of strongly acidic wastewater containing heavy metals will be produced, referred to as dirty acid. Sewage acid contains toxic substances such as mercury, arsenic, and cadmium, and the content is higher than that of ordinary industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 李剑胜
Owner 株洲三特环保节能股份有限公司
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