Double-layer composite pellet for treating copper slag and preparation method thereof

A double-layer composite and copper slag technology, which is applied in the field of double-layer composite pellets for processing copper slag and its preparation, can solve the problem of less research on the removal of harmful elements or harmless treatment, the treatment effect needs to be improved, and environmental pollution, etc. question

Active Publication Date: 2019-06-14
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment methods for copper slag mainly focus on the utilization of elements such as iron and copper, but copper slag also contains a certain amount of harmful elements such as S and As, which need to be removed or harmlessly treated, otherwise cause serious environmental pollution
However, the methods in the prior art have little research on the removal or harmless treatment of harmful elements such as S and As, and the treatment effect needs to be improved.

Method used

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  • Double-layer composite pellet for treating copper slag and preparation method thereof
  • Double-layer composite pellet for treating copper slag and preparation method thereof
  • Double-layer composite pellet for treating copper slag and preparation method thereof

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preparation example Construction

[0031] The present invention provides a method for preparing the double-layer composite pellets described in the above technical solution, comprising the following steps:

[0032] Pretreatment is carried out by mixing copper slag, potassium permanganate and part of water to obtain pretreated copper slag;

[0033] mixing the pretreated copper slag, iron powder, manganese dioxide, binder and remaining water, and then performing the first granulation to obtain a ball core;

[0034] spraying water glass on the surface of the ball core and mixing it with the cladding material, and then performing the second granulation to obtain green balls;

[0035] In an oxidizing atmosphere, the green balls are dried to obtain double-layer composite pellets.

[0036] The invention mixes copper slag, potassium permanganate and part of water for pretreatment to obtain pretreated copper slag. In the present invention, it is preferred to dissolve potassium permanganate with part of the water as a ...

Embodiment 1

[0050] Spray 50°C potassium permanganate aqueous solution (mass concentration is 0.5%, dosage is 30g) on ​​the surface of copper slag (particle size is 150~200 mesh, dosage is 1000g), after mixing uniformly, let it stand at 30°C for pretreatment Process 2h, obtain pretreatment copper slag;

[0051] With described pretreatment copper slag and fine iron powder (particle size is 200~300 order, grade is 60%, consumption is 100g), manganese dioxide (consumption is 30g), binding agent (carboxymethyl cellulose, consumption is 11.66g) were mixed, and then mixed with water, and the resulting mixture was placed in a disc pelletizer for the first granulation (the time was 7min) to obtain spherical cores (the particle size was 8-10mm, and the water content was controlled at 8-10mm). %);

[0052] Spray water glass (with a modulus of 1) on the surface of the ball core, mix it with the coating material (CaO, particle size 200-250 mesh) and place it in a disc pelletizer for the second granul...

Embodiment 2

[0055] Prepare double-layer composite pellets according to the method of embodiment 1, and difference is that binding agent is bentonite; Water glass modulus is 2; Covering material is Mg(OH) 2 .

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Abstract

The invention relates to the technical field of chemical engineering by-product treatment, in particular to a double-layer composite pellet for treating copper slag and a preparation method thereof. The double-layer composite pellet for treating the copper slag comprises a pellet core and a coating layer adhering to the surface of the pellet core. Preparation raw materials comprise the copper slag, fine iron powder, potassium permanganate, manganese dioxide, a clad material, a bonder, water glass and water. According to the pellet, the fine iron powder can increase the pellet forming rate of the double-layer composite pellet, and is beneficial for promoting nucleation and growth of iron crystal particles in the follow-up heat treatment process, and the recovery rate of valuable elements such as iron and silicon is increased. The water glass forms a transition area between the pellet core and the coating layer, meanwhile, bonding between the clad material and the pellet core is achieved, and the green pellet strength is improved beneficially. Potassium permanganate is decomposed on the high-temperature condition and releases oxygen, meanwhile, manganese dioxide is generated, the oxygen and the manganese dioxide can serve as oxidizing agents to oxidize sulfur and arsenic in the system, and the sulfur and arsenic removing effect is improved.

Description

technical field [0001] The invention relates to the technical field of chemical by-product treatment, in particular to a double-layer composite pellet for treating copper slag and a preparation method thereof. Background technique [0002] At present, pyrometallurgy plays a dominant role in the copper production process. However, a large amount of copper slag will be produced in the process of pyrometallurgy. When 1 ton of copper is produced by pyrometallurgy, 2.2 tons of copper slag will be produced at the same time. At present, the accumulated stockpile has reached 200 million tons. [0003] Copper slag contains 30-40% iron and 0.5-2% copper, which has high recycling value. At present, the treatment methods for copper slag mainly focus on the utilization of elements such as iron and copper, but copper slag also contains a certain amount of harmful elements such as S and As, which need to be removed or harmlessly treated, otherwise It will cause serious environmental poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/244C22B1/248
Inventor 赵凯张巧荣王彬魏志芳孔征张晓华师学峰韩伟刚
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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