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Method for preparing nickel iron by using rotary kiln for directly reducing nickel silicate ores

A technology of rotary kiln and nickel silicate, applied in chemical instruments and methods, rotary drum furnace, magnetic separation, etc., can solve the problems of large consumption of chemicals, difficult roasting atmosphere, and large investment, so as to improve the degree of automation and achieve continuity , The effect of short process flow

Inactive Publication Date: 2010-05-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

④ Invention patent applied by Zhang Yu for "Method of Directly Reducing Ferronickel with Laterite Nickel Ore in Tunnel Kiln Using Laterite Nickel Ore as Raw Material in Tunnel Kiln" (Application No. CN101037713), this invention is aimed at blast furnace smelting ferronickel and electric furnace smelting ferronickel to have the problems of large investment, high production cost and high carbon content of produced ferronickel
[0008] (1) The pyrotechnic process has disadvantages such as long roasting time, high roasting temperature, high energy consumption, difficulty in controlling the roasting atmosphere, poor production continuity, large exhaust emissions and difficult recovery.
[0009] (2) The wet process has defects such as large consumption of chemicals, difficulty in recycling waste liquid, difficulty in solving environmental problems, and difficulty in controlling process parameters.

Method used

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  • Method for preparing nickel iron by using rotary kiln for directly reducing nickel silicate ores
  • Method for preparing nickel iron by using rotary kiln for directly reducing nickel silicate ores
  • Method for preparing nickel iron by using rotary kiln for directly reducing nickel silicate ores

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Experimental program
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Embodiment 1

[0026] The raw material is magnesian nickel silicate ore, the raw ore contains 0.7-1.2% nickel and 8-11% iron. It belongs to serpentine-type magnesia nickel silicate ore. The silicon oxide content exceeds 60% in total. After crushing the ore to -20mm, place it in a drying kiln to dry until the external moisture is lower than 12%, and the drying temperature is 350°C. The dried ore is dry-milled to -100 mesh powder mineral powder by Raymond Mill , according to the mass ratio of mineral powder, add 2% CaF 2 , 5% calcium oxide, 0.2% cuprous chloride, 13% coke (particle size-1mm), 12% magnetite (containing Fe 68.24%) and mineral powder are mixed, and the pellet machine is used to mix The final material is made into -30+10mm pellets. The pellets are put into a drying kiln to dry until the external moisture is less than 12%. The drying temperature is 500°C. The dried pellets are roasted in a rotary kiln and rotated The temperature at point A of the kiln is 1250°C, the temperature a...

Embodiment 2

[0032] The raw material comes from the Mojiang area of ​​Yunnan. The raw ore contains about 0.80% nickel, the average iron content is less than 12%, and the content of magnesium oxide is higher than 25%. It belongs to magnesium nickel silicate ore, and the weathering phenomenon is relatively serious. present in the ore. After crushing the ore to -20mm, place it in a drying kiln to dry until the external moisture is lower than 11%, and the drying temperature is 300°C. The dried ore is dry ground to -100 mesh powder mineral powder by Raymond Mill , according to the mass ratio of mineral powder, add 1% NaF 2 , 10% of limestone, 0.1% of cuprous chloride, 15% of coke (particle size -1mm), 20% of hematite (containing Fe 61.24%) and mineral powder are mixed, and the pellet machine is used to mix the -30+10mm pellets are made from raw materials, and the pellets are placed in a drying kiln to dry until the external moisture is less than 13%, and the drying temperature is 450°C. The dr...

Embodiment 3

[0038] The raw material comes from a certain place in Sichuan, mainly magnesia nickel silicate ore, and limonite nickel silicate ore also accounts for about 15%. The raw ore contains 0.75-1.2% nickel, 10-13% iron, and magnesium oxide The content is about 40%. Crush the ore to -20mm and put it into a drying kiln to dry until the external moisture is lower than 10%. The drying temperature is 400°C. The dried ore is dry ground to -100 mesh powder mineral powder by Raymond Mill , according to the mass ratio of mineral powder, add 3% KF 2 , 20% of calcium oxide, 0.3% of cuprous chloride, 20% of coke (particle size-1mm), 18% of magnetite (containing Fe 65.44%) and mineral powder are mixed, and the pelletizer is used to mix the The final material is made into -30+10mm pellets, and the pellets are placed in a drying kiln to dry until the external moisture is less than 10%, and the drying temperature is 450°C. The dried pellets are transported to the rotary kiln for roasting , the te...

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Abstract

The invention relates to a method for preparing nickel iron by using a rotary kiln for directly reducing nickel silicate ores. The method comprises the steps of breaking the raw ores, placing in a drying kiln for drying, grinding into powder, adding 1-5% of fluoride, 5-20% of calcium oxide or 10-30% of limestone, 0.1%-0.5% of copper chloride, 10-25% of iron oxide and 5-20% of coke with the particle size of minus 1mm according to the weight percent to the ore powder into the ore powder, evenly mixing, forming pellets, placing in the drying kiln for drying, and further carrying out water quenching, grinding and magnetic separation, thereby obtaining a nickel iron rough concentrate product with not less than 4.5% of Ni, not less than 40% of Fe and not less than 85% of Ni recovery rate. The rotary kiln is adopted as a baking device in the method, thereby realizing the continuity of the production and greatly improving the degree of automation of the production. The method has the advantages of short process, small environmental pollution, high product quality and the like. The method improves the situation that the low-grade nickel silicate ores can not be effectively developed and utilized since a long time ago.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a method for preparing ferronickel by direct reduction of nickel silicate ore in a rotary kiln. Background technique [0002] Because nickel has good mechanical strength and ductility, is refractory and high temperature resistant, has high chemical stability, and is not oxidized in the air, it is a very important non-ferrous metal raw material and is used to make stainless steel , High-nickel alloy steel and alloy structural steel are widely used in various military manufacturing industries such as aircraft, radar, missiles, tanks, ships, spacecraft, and atomic reactors. In civil industry, nickel is often made into structural steel, acid-resistant steel, heat-resistant steel, etc., and is widely used in various machinery manufacturing industries. In addition, nickel can also be used as ceramic pigment and anti-corrosion coating. Nickel-cobalt alloy is a permanent magn...

Claims

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Application Information

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IPC IPC(8): C21B13/08B03C1/00
Inventor 肖军辉文书明刘殿文雷颜铭
Owner KUNMING UNIV OF SCI & TECH