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System and method for preparing ferronickel from laterite-nickel ore

A technology of laterite nickel ore and ferronickel, which is applied in the system field of preparing ferronickel from laterite nickel ore, can solve the problems of reducing the risk of tailings stockpiling, difficulty in reduction, and difficulty in transportation, so as to be beneficial to environmental protection, reduce ring formation, The effect of improving efficiency

Active Publication Date: 2017-05-10
山西环能工程项目管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention overcomes the deficiencies in the prior art, solves the problems of difficulty in conveying high-moisture laterite nickel ore, difficulty in drying, difficulty in crushing, difficulty in pelletizing, and difficulty in forming rings and reduction, and aims to provide a laterite nickel ore A system and method for preparing ferronickel from ore, the system and method can effectively solve the above problems, and at the same time reduce the power consumption and water consumption during the grinding and magnetic separation of laterite nickel ore roasting ore, and reduce the risk of tailings stockpiling

Method used

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  • System and method for preparing ferronickel from laterite-nickel ore

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Embodiment 1

[0045] The method proceeds as follows:

[0046] Step 1) Raw material pretreatment: After the laterite nickel ore and related auxiliary materials are metered and batched, they are sent to the drying crusher 15 through the belt conveyor 14, and high-temperature exhaust gas is introduced at the same time, and the mixing and crushing are completed in the drying crusher 15 at the same time , the high-temperature exhaust gas sends the materials with a thickness of less than 1 mm and a moisture content of <5% to the coarse powder separator, and after passing through the coarse powder separator, the materials with a large proportion of iron and nickel are collected into the qualified raw material bin 110.

[0047] Step 2) Pelletizing treatment: the raw materials in the qualified raw material bin 110 are mixed with water and stirred by a mixer, and then sent to a pelletizing machine, which makes the mixed raw materials into pellets. The pellets produced in the pelletizing process are s...

Embodiment 2

[0051] The difference between this embodiment and the previous embodiment is that the particle size of the pellets is 13 mm, the diameter of the rotary kiln 22 is 4.5 m, and the length of the rotary kiln 22 is 90 m.

[0052] In summary, the system and process for preparing ferronickel from laterite nickel ore of the present invention have adopted the following new processes: 1 is an integrated energy-saving process that combines rotary kiln 22, drying and crushing organically, and utilizes this process to solve the problem of The problem of sticking and blocking of high-humidity laterite nickel ore in the process of conveying, crushing and screening can also solve the "sandwich" problem of bulk materials, and change multi-stage crushing, multiple transfers, and multiple dusting points into one Breaking, closed-circuit operation, avoiding dust, is conducive to environmental protection.

[0053] The second is the air separation and slag removal process of raw ore. According to t...

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Abstract

The invention provides a system and a method for preparing ferronickel from laterite-nickel ore, belongs to the field of metal smelting, and solves the problems of difficulties in transporting, drying and crushing of the high-moisture raw laterite-nickel ore as well as the easiness in ringing and difficulty in reducing, caused by pelletizing difficulty. The method comprises the following steps of 1), pretreating the raw materials; 2) pelletizing; 3) implementing magnetizing roast and water quenching; and 4) grinding the ore, and implementing dry-separation. By means of the system and the method, the problems can be effectively solved, the consumption of electric power and water in the process of grinding and magnetic separation of the laterite-nickel ore roasted ore is reduced, and the piling risk of low tailings is reduced.

Description

technical field [0001] The invention belongs to the field of metal smelting, in particular to a system and method for preparing ferronickel from laterite nickel ore. Background technique [0002] The water content of laterite nickel ore is generally about 35%, and the nickel content is 0.5%-2.4%. The drying and crushing of the raw ore consumes a lot of energy. Transportation is also extremely difficult and failures occur frequently. [0003] The existing technology is to use quicklime to pre-mix, and then use the apron feeder to force-feed the material to the toothed roller crusher. The particle size of the crushed laterite nickel ore is about 200-400mm, and it is transported to the single-drum dryer through the belt conveyor for drying. Dry and hot air is supplied by a coal-fired hot air stove (the outlet air temperature is 800°C), and the dried material (with a water content of about 10%) is transported to a hammer crusher and a roller crusher through a belt conveyor for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02C22B1/24C22B1/02C22B1/00
CPCC22B1/00C22B1/02C22B1/2406C22B23/023
Inventor 张鹏辉刘永明冯雁飞胡志芳白银虎
Owner 山西环能工程项目管理有限公司
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