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Method for preparing nickel-containing stainless steel raw material from laterite-nickel ore by one-step process

A technology of laterite nickel ore and stainless steel, applied in fluidized bed furnaces and other directions, can solve the problems of complex process flow, long reduction time, low nickel recovery rate, etc., and achieve the effects of wide source, shortened production process and low price.

Active Publication Date: 2014-06-18
莱芜钢铁冶金生态工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The technological processes of the above inventions all have disadvantages such as complicated technological process, long reduction time, high energy consumption, low nickel recovery rate, etc., and new and better lateritic nickel ore treatment processes still need to be developed

Method used

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  • Method for preparing nickel-containing stainless steel raw material from laterite-nickel ore by one-step process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dry the laterite nickel ore containing 1.814% nickel and 17.87% total iron at 120±5°C for 2 to 2.5 hours to remove its free water. After drying, the laterite nickel ore and coal powder are respectively ball milled to a ratio of 2 -The principle of CaO content in MgO-CaO ternary slag system is 15% for mixing, using a double-roller high-pressure briquetting machine to press into pellets with a size of 15×25×30mm, and drying the green pellets (120±5°C , dry for 2 to 2.5 hours) and put it into a rotary hearth furnace for rapid reduction, the reduction temperature is 1400 ° C, the time is 30 minutes, and aluminum oxide is used as the refractory material. After reduction, carry out water cooling, crushing and separation of the pellets, and crush the pellets to less than 3mm. For the pearl iron with good growth effect, the method of gravity separation can be adopted; 200 Gauss, you can get nickel-containing stainless steel raw materials. The technical and economic indicators ...

Embodiment 2

[0040] Dry the laterite nickel ore containing 1.814% nickel and 17.87% total iron at 120±5°C for 2 to 2.5 hours to remove its free water. After drying, the laterite nickel ore and coal powder are respectively ball milled with a ball mill until the ratio of 2 -The principle of CaO content in MgO-CaO ternary slag system is 15% for mixing, using a double-roller high-pressure briquetting machine to press into pellets with a size of 15×25×30mm, and drying the green pellets (120±5°C , dry for 2 to 2.5 hours) and put it into a rotary hearth furnace for rapid reduction. The reduction temperature is 1340°C and the time is 35 minutes. Aluminum oxide is used as the refractory material. After reduction, carry out water cooling, crushing and separation of the pellets, and crush the pellets to less than 3mm. For the pearl iron with good growth effect, the method of gravity separation can be adopted; 200 Gauss, you can get nickel-containing stainless steel raw materials. The technical and e...

Embodiment 3

[0042] Dry the laterite nickel ore containing 1.814% nickel and 17.87% total iron at 120±5°C for 2 to 2.5 hours to remove its free water. After drying, the laterite nickel ore and coal powder are respectively ball milled with a ball mill until the proportion of 2 -The principle of CaO content in MgO-CaO ternary slag system is 15% for mixing, using a double-roller high-pressure briquetting machine to press into pellets with a size of 15×25×30mm, and drying the green pellets (120±5°C , dry for 2 to 2.5 hours) and put it into a rotary hearth furnace for rapid reduction. The reduction temperature is 1400°C and the time is 30 minutes. Graphite is used as the refractory material. After the reduction, the pellets are water-cooled and crushed and separated, and the slag and graphite are easily separated and crushed to less than 3mm. For the better effect of pearl iron growth, gravity selection can be used, which has a better effect on aggregate growth. If it is poor, it can be separat...

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Abstract

The invention belongs to the field of nonferrous metallurgy, and particularly relates to a method for preparing a nickel-containing stainless steel raw material from laterite-nickel ore by a one-step process. The method comprises the following steps: 1) drying the laterite-nickel ore; 2) performing ball milling on the dried laterite-nickel ore and the reducing agent pulverized coal; 3) adding quick lime and the ball-milled reducing agent pulverized coal into the ball-milled laterite-nickel ore, and pressing into green balls; 4) drying the pressed green balls; 5) quickly reducing the dried green balls; 6) performing water cooling on the balls after reducing roasting; 7) breaking and separating the reduced balls to below 3mm, thereby obtaining the nickel-containing stainless steel raw material by a reselection or magnetic separation way. According to the method provided by the invention, with specific reducing equipment, the reducing temperature is increased, the ball reducing time is greatly shortened, and the nickel recovery rate is improved. Meanwhile, the application range of the raw material is expanded for the dosing and ball pressing method for the low-grade laterite-nickel ore.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal metallurgy, in particular, the invention relates to a method for preparing nickel-containing stainless steel raw materials in one step from laterite nickel ore. Background technique [0002] In recent years, with the substantial increase in the demand and production capacity of stainless steel in my country, the demand for nickel and chromium has also increased. Chromium-nickel stainless steel accounts for two-thirds of the world's stainless steel production. In order to ensure the inherent corrosion resistance of stainless steel, the steel must contain more than 16% chromium and more than 8% nickel. Chromium and nickel are the basic additions for the production of stainless steel. my country needs to produce a large amount of ferrochrome and ferronickel every year. Nickel has the characteristics of anti-corrosion, anti-oxidation, high temperature resistance, high strength and good ductility, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B5/10C21B13/00
Inventor 姜雷曾晖孙永波闫小卫孙吉才张笃增林敏
Owner 莱芜钢铁冶金生态工程技术有限公司
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