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Preparation method of stabilizer for treating arsenic-containing waste residue

A technology of stabilizer and waste residue, applied in the field of preparation of new stabilizers, can solve the problems of sensitive environmental pH value, increase operating cost, long reaction period, etc. The effect of energy consumption

Active Publication Date: 2015-04-01
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] Embodiment 1: the preparation method of this processing arsenic waste residue stabilizer, concrete operations are as follows:

[0037] 1. Preparation of solid component A

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

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

[0040](3) Repeat the process step (2) 3 times for the activated carbon after drying to clean some impurities and dust inside the activated carbon;

[0041] (4) Put activated carbon into 0.05mol / L HNO at a solid-to-liquid ratio of 1:5 3 Solution dipping and aging for 30 hours, after solid-liquid separation, dry the activated carbon solid at 90°C for 24 hours, and set aside;

[0042] (5) Mix the lanthanum nitrate solution with a concent...

Embodiment 2

[0045] Embodiment 2: the preparation method of this processing arsenic waste residue stabilizer, concrete operations are as follows:

[0046] 1. Preparation of solid component A

[0047] (1) Coconut shell activated carbon for industrial use, ground through a 100-mesh sieve, and set aside;

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

[0049] (3) Repeat the process step (2) 4 times for the dried activated carbon to clean some impurities and dust inside the activated carbon;

[0050] (4) Put the activated carbon into 0.5mol / L HCl solution for immersion and aging for 27 hours at a solid-to-liquid ratio of 1:8. After solid-liquid separation, dry the activated carbon solid at 105°C for 15 hours and set aside;

[0051] (5) Mix lanthanum chloride with a concentrat...

Embodiment 3

[0054] Embodiment 3: the preparation method of this processing arsenic waste residue stabilizer, concrete operation is as follows:

[0055] 1. Preparation of solid component A

[0056] (1) Wooden activated carbon for industrial use, ground through a 200-mesh sieve, and set aside;

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

[0058] (3) Repeat the process step (2) 5 times for the dried activated carbon to clean some impurities and dust inside the activated carbon;

[0059] (4) Put activated carbon into 1mol / L CH at a solid-to-liquid ratio of 1:10 3 Immerse and age in COOH solution for 24 hours, after solid-liquid separation, dry the activated carbon solid at 125°C for 8 hours, and set aside;

[0060] (5) Mix the cerium chloride solution with a concentration...

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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 waste residue containing arsenic. 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 control of arsenic pollution. Arsenic-containing waste residues mainly come from smelting waste residues, arsenic-containing waste water and waste acid residues, arsenic-containing wastes from the electronics industry, and arsenic-containing waste generated during electrolysis. Arsenic sediment, etc. At present, domestic and foreign methods for treating arsenic-containing waste residues mainly include stabilization / solidification methods, fire roasting, and wet recovery methods. Stabilizat...

Claims

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Application Information

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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