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A kind of material for promoting nickel slag reduction and preparation method thereof

A technology for nickel slag and materials is applied in the field of materials and their preparation for promoting the reduction of nickel slag, which can solve the problems of difficult reduction of fayalite, and achieve the effects of reducing the difficulty of oxidation, reducing the resistance of mass transfer, and improving the reduction.

Active Publication Date: 2022-07-19
XIAN PENGYUAN METALLURGICAL EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the object of the present invention is to provide a material for promoting the reduction of nickel slag and its preparation method. The present invention can improve the reduction of nickel slag and solve the problem that fayalite is difficult to restore in the direct reduction process of nickel slag. problem, thereby increasing the recovery rate of iron in nickel slag

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  • A kind of material for promoting nickel slag reduction and preparation method thereof

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Embodiment approach

[0022] Based on the above principles, embodiments of the present invention are as follows:

[0023] The preparation method of the material that the present invention promotes nickel slag reduction is as follows:

[0024] The nickel slag is crushed to ≤0.074mm, accounting for 85%, and compound oxidant is added to the nickel slag, and the added amount is 0.25%-3% of the mass of the nickel slag. After mixing, it is granulated by a disc pelletizing machine. 3-8mm balls, dry the balls. Select a low-concentration oxidizing atmosphere (the oxygen volume content in the weak oxidizing atmosphere is 3%-12%) for high-temperature roasting to improve the phase structure of the nickel slag and achieve the purpose of strengthening reduction, and the roasting temperature is controlled at 420-570 ° C. In the composite oxidant, by mass percentage, it includes 45%-85% solid oxidant, 8%-30% auxiliary agent and 7%-25% strengthening agent; the solid oxidant is potassium chlorate, potassium permang...

Embodiment 1

[0032] The nickel slag is crushed so that the particles with a particle size of ≤0.074mm account for at least 85% of the mass, and the composite oxidant is added to the nickel slag raw material according to the mass ratio of 0.25%, fully mixed and granulated by a disc pelletizing machine to obtain a particle size of 3-8mm the pellets, drying the pellets. In the composite oxidant, potassium chlorate is used as the solid oxidant, calcium hydroxide is used as the auxiliary agent, and lithium bicarbonate is used as the strengthening agent. Then, oxidative roasting was carried out on the briqueted raw materials in an atmosphere with an oxygen volume content of 8% and a pre-oxidation temperature of 450°C for 40 minutes. The calcined samples were reduced at 1200°C for 30 minutes and cooled. The total iron and metal iron contents were analyzed by sampling, and the metallization rate of the reduced product was calculated to be 80.6%.

Embodiment 2

[0034] The nickel slag is crushed so that the particles with a particle size of ≤0.074mm account for at least 85% of the mass, and the composite oxidant is added to the nickel slag raw material at a mass ratio of 0.75%, fully mixed and granulated by a disc pelletizing machine to obtain a particle size of 3-8mm the pellets, drying the pellets. In the composite oxidant, potassium permanganate is used as the solid oxidant, sodium hydroxide is used as the auxiliary agent, and lithium bicarbonate is used as the strengthening agent. In terms of mass percentage, the content of the solid oxidant is 65%, the content of the auxiliary agent is 15%, and the content of the strengthening agent is 13%. %. Then, in an atmosphere with an oxygen volume content of 8% and a pre-oxidation temperature of 420°C, the briqueted raw materials were subjected to oxidative roasting for 60 minutes. The calcined samples were reduced at 1200°C for 30 minutes and cooled. The total iron and metallic iron cont...

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Abstract

The invention discloses a material for promoting the reduction of nickel slag and a preparation method thereof, belonging to the technical field of metallurgy and industrial waste slag resource utilization, and aims to improve the phase structure of nickel slag with high efficiency and low cost to achieve the purpose of strengthening reduction. The method includes adding an appropriate amount of composite oxidant into the nickel slag, controlling the atmosphere to be a weak oxidizing condition, and roasting at a high temperature to improve the iron-containing phase composition in the nickel slag. The composite oxidizing agent is composed of 45%-85% solid oxidizing agent, 8%-30% auxiliary agent and 7%-25% strengthening agent in mass percentage. The composite oxidant has reasonable component distribution, simple production process and convenient use, and has the functions of balancing the iron-containing phase of the nickel oxide slag and improving the phase composition and microstructure of the nickel slag. The composite oxidant cooperates with low-concentration oxygen-containing gas to avoid the high-temperature hardening phenomenon caused by the direct use of high-concentration oxygen-containing gas to oxidize nickel slag. Resource utilization of slag.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and industrial waste slag resource utilization, and particularly relates to a material for promoting the reduction of nickel slag and a preparation method thereof. Background technique [0002] Nickel slag is the waste slag discharged from the process of smelting nickel in flash furnace or oxygen-enriched top-blowing furnace. It contains valuable metals such as iron, chromium and nickel with high iron grade. It is an important secondary resource containing iron. At present, due to the lack of high-efficiency treatment technology, a large amount of nickel slag is piled up to occupy land and pollute the environment. Therefore, it is of great economic value and environmental benefit to carry out research on nickel smelting slag resource utilization technology. The direct reduction-magnetic separation process is a technology developed in recent years to effectively treat complex iron ore resources....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C22B1/248C21B13/00
CPCC22B1/16C22B1/2406C22B1/248C21B13/00
Inventor 李小明张馨艺庞焯刚臧旭媛邢相栋吴育庆王伟安阮锦榜
Owner XIAN PENGYUAN METALLURGICAL EQUIP CO LTD
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