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A preparation method for treating arsenic-containing waste residue stabilizer

A stabilizer and waste residue technology, which is applied in the field of preparation of new stabilizers, can solve the problems of environmental pH value sensitivity, increased operating costs, and long reaction cycle, so as to promote oxidation performance, reduce activation energy, reduce resources and The effect of energy consumption

Active Publication Date: 2017-05-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a long reaction cycle, requires long-term oxygen protection, and is sensitive to the impact of environmental pH value, and needs to add K 2 MnO 4 The oxidizing agent is not a common oxidizing agent, and measures such as desorption agent and curing are required, which increases the operating cost
[0007] At present, there are still few successful cases of safe treatment and disposal of arsenic-containing waste residues at home and abroad. In particular, there is still a lack of research on the safe treatment of large-scale, high-concentration arsenic-containing waste residues that is cheap, safe, reliable, and highly stable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: The preparation method of the stabilizer for treating arsenic-containing waste residue, the specific operation is as follows:

[0037] 1. Preparation of solid A component

[0038] (1) Coal-based activated carbon for industrial use, ground through a 4-mesh sieve for use;

[0039] (2) Wash the activated carbon powder with 70℃ deionized water, stir evenly, separate solid and liquid, pour the upper layer of deionized water containing impurities, and dry the cleaned activated carbon in a 105℃ drying cabinet for 5 hours;

[0040] (3) After drying the activated carbon, repeat the process step (2) 3 times to clean some impurities and dust inside the activated carbon;

[0041] (4) Put the activated carbon into 0.05mol / L HNO according to the solid-liquid ratio of 1:5 3 The solution is immersed and aged for 30 hours, and after solid-liquid separation, the activated carbon solid is dried at 90°C for 24 hours for use;

[0042] (5) The lanthanum nitrate solution with a concentration ...

Embodiment 2

[0045] Embodiment 2: The preparation method of this treatment arsenic-containing waste residue stabilizer, the specific operation is as follows:

[0046] 1. Preparation of solid A component

[0047] (1) Industrial coconut shell activated carbon, ground through a 100-mesh sieve, ready for use;

[0048] (2) Wash the activated carbon powder with 90℃ deionized water, stir evenly, separate solid and liquid, pour the upper layer of deionized water containing impurities, and dry the cleaned activated carbon in a drying oven at 105℃ for 7 hours;

[0049] (3) After drying the activated carbon, repeat the process step (2) 4 times to clean some impurities and dust inside the activated carbon;

[0050] (4) The activated carbon was immersed in a 0.5mol / L HCl solution at a solid-to-liquid ratio of 1:8 for 27h, and after solid-liquid separation, the activated carbon solid was dried at 105℃ for 15h for use;

[0051] (5) Mix lanthanum chloride with a concentration of 0.1 mol / L and cerium chloride with a ...

Embodiment 3

[0054] Embodiment 3: The preparation method of this treatment arsenic-containing waste residue stabilizer, the specific operation is as follows:

[0055] 1. Preparation of solid A component

[0056] (1) Industrial wooden activated carbon, ground through a 200-mesh sieve, ready for use;

[0057] (2) Wash the activated carbon powder with 100°C deionized water, stir well, separate solid and liquid, pour the upper layer of deionized water containing impurities, and dry the washed activated carbon in a 105°C drying oven for 10 hours;

[0058] (3) After drying the activated carbon, repeat the process step (2) 5 times to clean some impurities and dust inside the activated carbon;

[0059] (4) Put activated carbon into 1mol / L CH according to the solid-liquid ratio of 1:10 3 The COOH solution is immersed and aged for 24 hours, and after solid-liquid separation, the activated carbon solid is dried at 125°C for 8 hours for use;

[0060] (5) Mix 1mol / L cerium chloride and 1mol / L zirconium chloride s...

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PUM

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Abstract

The invention provides a preparation method of a stabilizer for treating arsenic-containing waste residue. The stabilizer is prepared from a solid component A and a liquid component B; a ternary strong oxidization system of a modified activated carbon adsorption catalyst, a calcium-based auxiliary and iron-carbon micro-electrolysis is formed by feeding a solid agent and a liquid agent, respectively; based on the iron-carbon micro-electrolysis mechanism, the activation energy of the catalytic reaction can be greatly reduced; lanthanum, cerium and zirconium serve as the oxidation catalysts of the system; Cu<2+> is capable of providing extra lattice oxygen for the system; H2O2 and ferrous or ferric ions formed after microelectrolysis under an alkali condition are capable of generating a large quantity of hydroxyl free radicals; as a result, the oxidation property of the system is greatly improved. Meanwhile, due to auxiliary and synergistic adsorption of the activated carbon, ferric hydroxide colloid and calcium salt, the arsenic is stabilized; the stabilizer has the characteristics of low cost and high activity; the arsenic removal rate of the arsenic-containing waste residue treated by stabilization by use of the method is more than 99%.

Description

Technical field [0001] The invention belongs to the technical field of hazardous waste treatment, and relates to a preparation method of a novel stabilizer for stabilizing arsenic-containing waste residue. Background technique [0002] Arsenic and its compounds enter the environment through natural effects and human activities. It has carcinogenic effects and seriously affects human health. Therefore, in recent years, countries all over the world have paid more and more attention to the treatment of arsenic pollution. The arsenic-containing waste residues mainly come from smelting waste residues, processing arsenic-containing wastewater and waste acid sediments, arsenic-containing wastes from the electronics industry, and arsenic-containing wastes produced during electrolysis. Arsenic sediment and so on. At present, the domestic and foreign methods for processing arsenic-containing waste residues are mainly stabilization / solidification methods, fire roasting, and wet recovery me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/38A62D101/24
CPCA62D3/38A62D2101/24
Inventor 宁平林奕龙瞿广飞郝吉明陆俏利
Owner KUNMING UNIV OF SCI & TECH