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A kind of high arsenic polluted acid treatment method

A treatment method, a technology for high-arsenic polluted acid, applied in the direction of improving process efficiency, etc., can solve problems such as difficult treatment of high-arsenic polluted acid, and achieve the effect of safe treatment

Active Publication Date: 2021-01-26
SHANDONG GUODA GOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing high-arsenic polluted acid is difficult to treat, the present invention provides a method for treating high-arsenic polluted acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for treating high-arsenic polluted acid, comprising the steps of:

[0017] 1) Sulfuric acid slag output: add zinc-precipitated liquid to the tailings of direct cyanidation gold extraction, and obtain sulfur concentrate pulp and tailings with a concentration of 65% after a rough separation, a second separation, and two sweeps Ore slurry and tailings slurry are used to make bricks or cement after pressure filtration. Sulfur concentrate slurry enters the roaster at a rate of 10t / h. Fluidizing air is introduced into the roaster for weak oxygen roasting. The roasting temperature is 700°C and the roasting is linear. The speed is 0.7m / s, and the roasting time is 20s; sulfur dioxide gas and sulfuric acid slag are obtained from the reaction, and the sulfur dioxide gas enters the sulfuric acid production system, and the sulfuric acid slag contains 0.5% copper and 0.5% zinc;

[0018] 2) Acid leaching to extract copper and zinc: add sulfuric acid slag to the high-arsenic p...

Embodiment 2

[0023] A method for treating high-arsenic polluted acid, comprising the steps of:

[0024] 1) Sulfuric acid slag output: adding zinc-precipitated liquid to the tailings of direct cyanidation gold extraction, after a rough separation, a second separation, and two sweeps, sulfur concentrate pulp and tailings pulp with a concentration of 66.5% are obtained , the tailings slurry is used to make bricks or cement after pressure filtration. The sulfur concentrate slurry enters the roaster at a rate of 12t / h, and the fluidized air is introduced into the roaster for weak oxygen roasting. The roasting temperature is 750°C, and the roasting linear speed is 0.85m / s, and the roasting time is 20s; the reaction obtains sulfur dioxide gas and sulfuric acid slag, and the sulfur dioxide gas enters the sulfuric acid production system, and the sulfuric acid slag contains 0.75% copper and 0.75% zinc;

[0025] 2) Acid leaching to extract copper and zinc: Add sulfuric acid slag to the high-arsenic p...

Embodiment 3

[0030] A method for treating high-arsenic polluted acid, comprising the steps of:

[0031]1) Sulfuric acid slag output: adding zinc-precipitated liquid to the tailings of direct cyanidation gold extraction, after a rough separation, a second separation, and two sweeps to obtain sulfur concentrate pulp and tailings pulp with a concentration of 68% , the tailings slurry is used to make bricks or cement after pressure filtration, the sulfur concentrate slurry enters the roaster at a rate of 14t / h, and the fluidized air is introduced into the roaster for weak oxygen roasting, the roasting temperature is 800°C, and the roasting linear speed It is 1m / s, and the roasting time is 20s; react to obtain sulfur dioxide gas and sulfuric acid slag, and the sulfur dioxide gas enters the sulfuric acid production system, and the sulfuric acid slag contains 1.0% copper and 1.0% zinc;

[0032] 2) Acid leaching to extract copper and zinc: Add sulfuric acid slag to the high-arsenic polluted acid, ...

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PUM

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Abstract

The invention discloses a method for treating polluted acid with high arsenic content. The steps include sulfuric acid slag output, copper and zinc leaching by acid leaching, neutralization, replacement reaction, arsenic recovery, zinc recovery and the like. The beneficial effects of the present invention are: the present invention first uses high-arsenic polluted acid to leach copper and zinc in sulfuric acid slag, utilizes the acidity of the polluted acid, and comprehensively extracts copper and zinc from sulfuric acid slag, reducing the amount of copper and zinc in sulfuric acid slag. content, improve the quality of sulfuric acid slag, and then recover copper through neutralization reaction, iron powder replacement reaction, arsenic precipitation after replacement, zinc recovery after arsenic precipitation, and return of zinc precipitation liquid return utilization technology, so that the high arsenic pollution acid Acid, copper, arsenic, and zinc are comprehensively recovered and utilized, thus realizing the safe treatment of high-arsenic polluted acid.

Description

technical field [0001] The invention relates to the treatment of smelting solid waste, in particular to a treatment method for high-arsenic polluted acid. Background technique [0002] In the process of pyrite and polymetallic sulfide mineral smelting and flue gas acid production, a large amount of waste liquid will be produced, which contains a large amount of sulfuric acid, as well as toxic and harmful ions such as arsenic, copper, lead, zinc, etc., especially three The content of valent arsenic ions can even exceed 200mg / L. Usually, the waste liquid produced by sulphide mineral smelting and flue gas acid production with arsenic ion content exceeding 200 mg / L is called high-arsenic polluted acid. If these high-arsenic polluted acids are discharged directly, they will cause serious environmental pollution. [0003] At present, the commonly used treatment methods for high-arsenic polluted acid in industry are mainly sulfuration method and lime neutralization method. The v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/06C22B15/00C22B19/30C22B30/04C22B19/20
CPCC22B1/06C22B7/007C22B15/0069C22B15/0091C22B19/22C22B19/30C22B30/04Y02P10/20
Inventor 王建政张玉欧海涛王敏杰刘俊伟孙学平辛朋朋王力焦磊郭建东
Owner SHANDONG GUODA GOLD
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