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Arsenic sulfide waste residue recycling treatment method and device thereof

A treatment method and treatment device technology, applied in the direction of solid waste removal, etc., can solve the problems of secondary pollution, long operation time, high consumption, etc., achieve no secondary wastewater pollution, avoid secondary hazardous waste, and low energy consumption Effect

Active Publication Date: 2015-03-25
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Abstract
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Problems solved by technology

[0012] In order to solve the above-mentioned traditional arsenic sulfide waste residue treatment method of large consumption, As 2 o 3 or As 2 o 5 Low purity, long operation time, complex process, low resource recovery rate and secondary pollution, etc., the present invention proposes a low consumption, high product purity, simple process, high recovery rate of As and S and no secondary pollution of arsenic sulfide Waste residue treatment method

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  • Arsenic sulfide waste residue recycling treatment method and device thereof

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Effect test

Embodiment 1

[0054] As produced in the production process of a phosphoric acid plant 2 S 3 Slag, the arsenic content is 10%.

[0055] (1) Take 1000g of the above As 2 S 3 The slag is placed in a horizontal stirring leaching reactor, and then 2% NaOH solution is added for leaching to obtain a solution containing thioarsenite, n(OH - ): n(As)=4, the leaching temperature is 25°C, the leaching time is 10min, and the leaching rate is above 99.999995%;

[0056] (2) The solution obtained after alkaline leaching enters the first precision filter to separate and obtain 3% alkaline leaching solution and residue;

[0057] (3) 3% alkaline leaching solution enters the vertical stirring oxidation reaction kettle, and then passes through pure oxygen for oxidative desulfurization, and completely oxidizes the thioarsenite in it to arsenite ion;

[0058] (4) The oxidized solution from the vertical stirring oxidation reactor enters the second precision filter to separate and obtain the sulfur product an...

Embodiment 2

[0062] As produced in the production process of a sulfuric acid plant 2 S 5 Slag, the arsenic content is 25%.

[0063] (1) Take 1000g of the above As 2 S 5 The slag is placed in a horizontal stirring leaching reactor, and then a 5% NaOH solution is added for leaching to obtain a solution containing thioarsenate, n(OH - ): n(As)=5, the leaching temperature is 30°C, the leaching time is 20min, and the leaching rate is over 99.999996%;

[0064] (2) The solution obtained after alkaline leaching enters the first precision filter to separate and obtain 5.4% alkaline leaching solution and residue;

[0065] (3) The 5.4% alkaline leaching solution enters the vertical stirring oxidation reaction kettle, and then passes through pure oxygen for oxidative desulfurization, and completely oxidizes the thioarsenate in it to arsenate ion;

[0066] (4) The oxidized solution from the vertical stirring oxidation reactor enters the second precision filter to separate and obtain the sulfur pro...

Embodiment 3

[0070] As produced in the production process of a copper company 2 S 2 and As 2 S 3 Slag, the arsenic content is 50%.

[0071] (1) Take 1000g of the above As 2 S 2 and As 2 S 3 The slag is placed in a horizontal stirring leaching reactor, and then a 6% NaOH solution is added for leaching to obtain a solution containing thioarsenite, n(OH -): n(As)=5, the leaching temperature is 40°C, the leaching time is 25min, and the leaching rate is over 99.999997%;

[0072] (2) The solution obtained after alkaline leaching enters the first precision filter to separate and obtain 6.5% alkaline leaching solution and residue;

[0073] (3) 6.5% alkaline leaching solution enters the vertical stirring oxidation reaction kettle, and then passes through pure oxygen for oxidative desulfurization, and completely oxidizes the thioarsenite in it to arsenite ion;

[0074] (4) The oxidized solution from the vertical stirring oxidation reactor enters the second precision filter to separate and o...

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Abstract

The invention discloses an arsenic sulfide waste residue recycling treatment method, which comprises the following steps: performing alkaline leaching to obtain sulfo-arsenite or sulfo-arsenate solution, filtering to remove waste residues through a filter, to obtain alkaline leachate, then performing oxidation desulfurization, so as to oxidize sulfo-arsenite or sulfo-arsenate into sulfo-arsenite or arsenate ions, then filtering and separating elemental sulfur through another filter to obtain arsenite or arsenate solution, recovering acid-base from the arsenite or arsenate solution by utilizing a bipolar membrane device, returning base solution for alkaline leaching and acid solution for crystalization and preparation of As2O3 or As2O5, performing electrodialysis or reverse osmosis concentration on residual liquor in a bipolar membrane salt chamber, returning concentrated liquor as inflowing water of the salt chamber of the bipolar membrane device, and draining or recovering fresh water. According to the arsenic sulfide waste residue recycling treatment method, the problems that for the traditional arsenic sulfide waste residue treatment method, consumption is large, the content of arsenic in effluent water does not reach the standard, the recycling rate is low, the technological process is complicated, secondary pollution exists and the like can be solved, the content of arsenic in effluent water reaches the standard, the recycling rate of As and S is high, the advantages of low consumption, low running cost, simple technological process and the like can be achieved.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a resource treatment method and device for arsenic sulfide waste residue. Background technique [0002] Arsenic in arsenic sulfide waste residue is in the form of amorphous sulfide (such as As 2 S 2 or As 2 S 3 or As 2 S 5 and other forms), it is very easy to dissolve arsenic in an acidic or alkaline environment, which will pose a serious threat to natural water resources. At the same time, arsenic and its compounds are also a valuable resource widely used in pesticides, herbicides, insecticides, dyes and alloys. Traditional methods for treating arsenic sulfide slag mainly include: dry method and wet method. [0003] The dry method refers to the treatment of arsenic sulfide slag by oxidation roasting, reduction roasting and vacuum roasting. 2 o 3 It is the most commonly used method to recover arsenic trioxide from arsenic sulfide slag in China. The dry p...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
Inventor 刘晨明李志强林晓
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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