A resourceful treatment method and device for arsenic sulfide waste residue

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: 2016-09-14
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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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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  • A resourceful treatment method and device for arsenic sulfide waste residue

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Experimental program
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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 into 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 ...

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 above 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) 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 produc...

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 3The 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 a recycling treatment method for arsenic sulfide waste residue. It obtains thioarsenite or thioarsenate solution by alkaline leaching, removes the residue by filtering through a filter to obtain an alkaline leaching solution, and then performs oxidative desulfurization. Substitute arsenite or thioarsenate is oxidized to arsenite or arsenate ion, and then filtered through another filter to separate elemental sulfur to obtain arsenite or arsenate solution, which can be used The bipolar membrane device recovers acid and alkali, the alkaline solution is returned for alkaline leaching, the acid solution is used for crystallization to prepare As2O3 or As2O5, the bipolar membrane salt chamber residue enters electrodialysis or reverse osmosis concentration, and the concentrated solution is returned as the bipolar membrane device. Salt room intake, fresh water discharge or recovery; the invention solves the problems of high consumption of traditional arsenic sulfide waste residue treatment methods, substandard arsenic content in effluent water, low resource recovery rate, complicated process flow and secondary pollution, etc., and the arsenic content in effluent is stable It meets the standard, and the recovery rate of As and S resources is high, and it has the advantages of less consumption, low operating cost, and simple process flow.

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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Patent Type & Authority Patents(China)
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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