Stabilized treatment method for realgar tailing residues

A tailings slag and stabilization technology, which is applied in the field of realgar tailings slag stabilization and disposal, can solve the problems of reducing volume increase ratio, insufficient long-term stability of products, slow oxidation rate of arsenic sulfide, etc., and achieves the effect of accelerating dissolution

Active Publication Date: 2018-10-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the existing technology, it can effectively solve the problems of slow dissolution rate of calcium arsenate, slow oxidation rate of arsenic sulfide, and insufficient long-term stability of the product. The leaching concentration of arsenic after treatment can meet the hazar...

Method used

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  • Stabilized treatment method for realgar tailing residues
  • Stabilized treatment method for realgar tailing residues
  • Stabilized treatment method for realgar tailing residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Crushing the realgar tailing slag to a particle size ≤ 5mm.

[0058] (2) Take 30 g of the crushed realgar tailing slag, add 12 mL of water (that is, the mass ratio of water to realgar tailing slag is 5:10), and stir evenly.

[0059] (3) Put the mixture obtained in step (2) into a quartz container for microwave treatment for 10 minutes, the microwave power is set to 250W, and the microwave frequency is 2455MHz.

[0060] (4) Add 10 mL of water to the mixture after microwave dissolution treatment (i.e. the mass ratio of water to realgar tail slag is 3.3:10), and then add 7.5 g of ferrous sulfate heptahydrate (i.e. ferrous sulfate heptahydrate and realgar The mass ratio of tailings slag is 2.5:10), and stir evenly.

[0061] (5) Continuously feed air into the mixture obtained in step (4), and carry out microwave treatment for 10 minutes at the same time, the microwave power is set to 450W, and the microwave frequency is 2455MHz.

[0062] (6) Stop feeding air, and carry...

Embodiment 2

[0068] (1) Crushing the realgar tailing slag to a particle size ≤ 5mm.

[0069] (2) Take 30 g of the crushed realgar tail slag, add 20 mL of water (that is, the mass ratio of water to realgar tail slag is 6.7:10), and stir evenly.

[0070] (3) Put the mixture obtained in the step (2) into a quartz container for microwave treatment for 15 minutes, the microwave power is set to 150W, and the microwave frequency is 2455MHz.

[0071](4) Add 15mL of water to the mixture after microwave dissolution treatment (i.e. the mass ratio of water to realgar tail slag is 5:10), and then add 9g of ferrous sulfate heptahydrate (i.e. ferrous sulfate heptahydrate and realgar tail The mass ratio of slag is 3:10), and stir evenly.

[0072] (5) Pass air into the mixture obtained in step (4), and carry out microwave treatment for 5 minutes at the same time, the microwave power is set to 350W, and the microwave frequency is 2455MHz.

[0073] (6) The mixture obtained in step (5) was subjected to micr...

Embodiment 3

[0079] (1) Crushing the realgar tailing slag to a particle size of ≤2mm.

[0080] (2) Take 30 g of crushed realgar tailing slag, add 9 mL of water (that is, the mass ratio of water to realgar tailing slag is 3:10), and stir evenly.

[0081] (3) Put the mixture obtained in the step (2) into a quartz container for microwave treatment for 20 min, the microwave power is set to 100 W, and the microwave frequency is 2455 MHz.

[0082] (4) Add 7 mL of water to the mixture after microwave dissolution treatment (i.e. the mass ratio of water to realgar tail slag is 2.3:10), and then add 4.5 g of ferrous sulfate heptahydrate (i.e. ferrous sulfate heptahydrate and realgar The mass ratio of tailings slag is 1.5:10), and stir evenly.

[0083] (5) Pass air into the mixture obtained in step (4), and carry out microwave treatment for 20 min at the same time, the microwave power is set to 300W, and the microwave frequency is 2455MHz.

[0084] (6) The mixture obtained in step (5) was subjected...

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Abstract

The invention discloses a stabilized treatment method for realgar tailing residues. The stabilized treatment method for the realgar tailing residues comprises the following steps of (1) crushing the realgar tailing residues, adding water inside, uniformly stirring, and carrying out first-stage microwave treatment under the action of a microwave field at the power ranging from 100W to 300W; (2) adding water and ferrous salt inside, uniformly stirring, feeding air or oxygen, and meanwhile, carrying out second-stage microwave treatment under the action of a microwave field at the power ranging from 300W to 500W; and (3) carrying out third-stage microwave treatment under the action of a microwave field at the power ranging from 500W to 700W, so that the stabilization of the realgar tailing residues is realized. According to the stabilized treatment method for the realgar tailing residues provided by the invention, through designing a whole process technology of the method, especially improving parameters and conditions of a key microwave treatment process, and dissolving, oxidizing and stabilizing the realgar tailing residues for three stages, the problems of slow calcium arsenate dissolution rate, slow arsenic sulfide oxidation rate and insufficient product long-time stability can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field related to the disposal of arsenic-containing tailings, and more specifically relates to a method for stabilizing the disposal of realgar tailings slag. Background technique [0002] Realgar ore is a unique mineral in my country, with the largest reserves in the world. my country has been mining it for 1,500 years. However, due to the backwardness of ore dressing and production technology, a large amount of high-arsenic tailings without any treatment has been left behind, which has become an environmental arsenic. One of the important sources of pollution. The highly toxic arsenic released from realgar tailings has seriously threatened human health through surface water, groundwater, soil and food chain. [0003] Different from common iron-rich and arsenic solid wastes that mainly contain relatively stable iron-arsenic minerals, realgar tailing slag mainly contains arsenic sulfide (realgar and orpiment) and ...

Claims

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Application Information

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IPC IPC(8): A62D3/38A62D101/43
CPCA62D3/38A62D2101/43
Inventor 王琳玲丁嘉琪陈静李鸿博张荷王鑫
Owner HUAZHONG UNIV OF SCI & TECH
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