Harmless treatment method of arsenic-containing waste reagent

A technology of harmless treatment and reagents, which is applied in the direction of protection devices against harmful chemicals, etc., can solve the problems of low arsenic content and inability to dispose of arsenic trioxide, etc., achieve simple steps, reduce toxicity and migration, and reduce pollution and harm Effect

Active Publication Date: 2021-04-30
SHAANXI NEW WORLD SOLID WASTE COMPREHENSIVE DISPOSAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, the existing technology can only dispose of arsenic slag and arsenic-containing waste with low arsenic content, and cannot dispose of pure sodium arsenite, trisodium arsenate, and arsenic trioxide

Method used

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  • Harmless treatment method of arsenic-containing waste reagent
  • Harmless treatment method of arsenic-containing waste reagent
  • Harmless treatment method of arsenic-containing waste reagent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of harmless treatment method of waste reagent containing arsenic, see figure 1 , the method includes the following steps:

[0031] Step (1): dissolving the waste reagent containing arsenic to obtain a first solution.

[0032] Step (2): fully reacting ferrous sulfate with the first hydrogen peroxide to obtain a second solution.

[0033] Step (3): Slowly add the second solution to the first solution and react to obtain the third solution;

[0034] Step (4): Calcium oxide, cement and gravel are added to the third solution for reaction to obtain a water-insoluble iron arsenate complex.

Embodiment 2

[0036] combine figure 2 to the above figure 1 A harmless treatment method for arsenic-containing waste reagents shown in the article is discussed in detail, see figure 2 , the method includes the following steps:

[0037] Step (101): dissolving 1000 g of sodium arsenite in 7000 g of water to obtain a first solution.

[0038] Step (102): Fully react 2000g of ferrous sulfate with 4000g of first hydrogen peroxide for 20-40min to obtain a second solution.

[0039] Step (103): Slowly add the second solution to the first solution, and react for 1 hour to obtain a third solution.

[0040] Step (104): Add 500g of calcium oxide, 5000g of cement, and 10000g of gravel into the third solution, and react for 2 hours. After the reaction, the pH is 10-11 to obtain a water-insoluble iron arsenate complex.

[0041] It should be noted that according to the above method, the staff conducted three sets of tests, obtained three sets of sodium arsenite-treated samples, and tested the three se...

Embodiment 3

[0046] combine image 3 to the above figure 1 A harmless treatment method for arsenic-containing waste reagents shown in the article is discussed in detail, see image 3 , the method includes the following steps:

[0047] Step (201): dissolving 1000 g of trisodium arsenate in 7000 g of water to obtain a first solution.

[0048] Step (202): Fully react 2000g ferrous sulfate with 4000g first hydrogen peroxide for 20-40min to obtain a second solution.

[0049] Step (203): Slowly add the second solution to the first solution, and react for 1 hour to obtain a third solution.

[0050] Step (204): Add 500g of calcium oxide, 5000g of cement, and 10000g of gravel into the third solution, and react for 2 hours. After the reaction, the pH is 10-12 to obtain a water-insoluble iron arsenate complex.

[0051] It should be noted that according to the above method, the staff conducted three sets of tests, obtained three sets of trisodium arsenate treated samples, and tested the three sets...

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Abstract

The invention discloses a harmless treatment method of an arsenic-containing waste reagent, and belongs to the technical field of harmless treatment of highly toxic reagents of hazardous wastes. The method comprises the steps: dissolving the arsenic-containing waste reagent to obtain a first solution; fully reacting ferrous sulfate with first hydrogen peroxide to obtain a second solution; slowly adding the second solution into the first solution, and reacting to obtain a third solution; and adding calcium oxide, cement and gravel into the third solution. According to the method, a certain amount of ferrous sulfate, hydrogen peroxide and calcium oxide are added into the arsenic-containing waste reagent, so that As<3+> and Fe<2+> are respectively converted into As<5+> and Fe<3+> by the arsenic-containing waste reagent through oxidation-reduction and complexing co-precipitation reactions, arsenic-iron complex precipitates are generated, and the stabilizing effect of reducing the toxicity and mobility of the arsenic-iron complex precipitates is achieved; and finally, cement, sand and other stabilizers and curing agents are added for curing treatment, so that harmful components are effectively prevented from migrating and diffusing into the environment, and pollution and harm to human bodies and the environment are reduced.

Description

technical field [0001] The invention relates to the technical field of harmless disposal of hazardous waste highly toxic reagents, in particular to a method for harmless disposal of waste reagents containing arsenic. Background technique [0002] Arsenic-containing reagents are highly toxic substances, such as arsenic trioxide, sodium arsenite, and trisodium arsenate, which enter the body through the respiratory tract or digestive tract, mainly affecting the human nervous system and capillary permeability, and irritating to the skin and mucous membranes . Therefore, both arsenic-containing reagents and arsenic-containing packaging must be properly disposed of in order to effectively prevent harm to humans, animals, plants, and the environment. [0003] Prior art 1: A method for treating arsenic-containing waste, the application number is CN106180138A. This invention obtains a high-concentration sodium arsenite or sodium arsenate solution through alkaline leaching of high-ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D101/40
CPCA62D3/33A62D2101/40A62D2203/02
Inventor 范增华王金博洪常亮何礼龙张花娟康建李宇文锐李俊阳
Owner SHAANXI NEW WORLD SOLID WASTE COMPREHENSIVE DISPOSAL
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