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Method for smelting high-nickel molten iron through low-poor-grade nickel laterite ore

A technology of laterite nickel ore and grade, applied in blast furnaces, blast furnace details, furnaces, etc., can solve the problems of incompetence, high power consumption, heavy burden on ball mills, etc., and achieve the effects of reducing the degree of ring formation, reducing costs and increasing output.

Active Publication Date: 2016-04-06
潘料庭 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The remaining defects of this method are: the reduced calcined sand is directly subjected to wet ball milling, the amount of material in the ball mill and the amount of visible ferronickel reduction particles are relatively large, the burden on the ball mill is heavy, and the power consumption is high; acid treatment is used to dissolve part of the iron and Its compounds consume a lot of acid and are not economical

Method used

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  • Method for smelting high-nickel molten iron through low-poor-grade nickel laterite ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] (1) Roasting reduction: take 100 parts by weight of low-grade lateritic nickel ore, dry until the water content is 16% to 19%, and crush until the particles with a particle size of ≤3mm account for more than 80% of the total number of particles; then add limestone 2 Parts by weight, 15 parts by weight of reduced carbon; roasting reduction treatment is carried out in a rotary kiln, wherein the temperature of the preheating zone is 500°C, the temperature of the decomposition transition zone is 1000°C, the temperature of the high temperature reduction zone is 1350°C, and the condensation zone (kiln head) The discharge temperature is 1150°C, and iron slag ore is obtained.

[0096] (2) Magnetic separation: the above-mentioned iron slag ore is carried out magnetic separation enrichment to obtain selected enrichment ore. The specific magnetic separation enrichment process is as follows:

[0097] Firstly, the self-unloading permanent magnet iron remover is used to carry out the...

Embodiment 2

[0117] (1) Roasting and reduction: take 100 parts by weight of low-grade laterite nickel ore, dry it until the water content is 16% to 19%, and crush it until the particles with a particle size of ≤3mm account for more than 80% of the total number of particles; add limestone 3 Parts by weight, 14 parts by weight of reduced carbon; roasting reduction treatment is carried out in a rotary kiln, wherein the temperature of the preheating zone is 400°C, the temperature of the decomposition transition zone is 850°C, the temperature of the high temperature reduction zone is 1300°C, and the condensation zone (kiln head) The discharge temperature is 1100°C, and iron slag ore is obtained;

[0118] (2) Magnetic separation: the above-mentioned iron slag ore is carried out magnetic separation enrichment to obtain selected enrichment ore. The specific magnetic separation enrichment process is as follows:

[0119] Firstly, the self-unloading permanent magnet iron remover is used to carry out ...

Embodiment 3

[0139] (1) Roasting reduction: take 100 parts by weight of low-grade lateritic nickel ore, dry until the water content is 16% to 19%, and crush until the particles with a particle size of ≤3mm account for more than 80% of the total number of particles; then add limestone 2 Parts by weight, reduced carbon 13 parts by weight; Carry out roasting and reduction treatment in the rotary kiln, wherein, the temperature of the preheating zone is 400°C, the temperature of the decomposition transition zone is 800°C, the temperature of the high temperature reduction zone is 1250°C, and the condensation zone (kiln head) The discharge temperature is 1050°C, and iron slag ore is obtained.

[0140] (2) Magnetic separation: the above-mentioned iron slag ore is carried out magnetic separation enrichment to obtain selected enrichment ore. The specific magnetic separation enrichment process is as follows:

[0141] Firstly, the self-unloading permanent magnet iron remover is used to carry out the f...

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Abstract

The invention belongs to the field of stainless steel smelting and particularly relates to a method for smelting high-nickel molten iron through low-poor-grade nickel laterite ore. The method comprises the steps that the low-poor-grade nickel laterite ore is subjected to reducing roasting and magnetic concentration, and then enriched ore is obtained; then sinter burdening is conducted on the enriched ore and the low-poor-grade nickel laterite ore, and high-grade high-nickel sintered ore is obtained through sintering; and the high-grade high-nickel sintered ore is sent into a blast furnace to be smelted, and the high-nickel molten iron is obtained. According to the method, iron slag ore subjected to roasting reduction through a rotary kiln is enriched through magnetic separation, and a large amount of slag is removed, so that charging slag is greatly reduced; a large amount of unnecessary fuel waste can be eliminated for the blast furnace, and the cost is reduced. Through the synergistic effect of all the steps and parameters, the high-nickel molten iron meeting the charging high-nickel molten iron content requirements of stainless steel smelting through argon oxygen decarburization (AOD) furnaces can be produced.

Description

technical field [0001] The invention belongs to the field of stainless steel smelting, and in particular relates to a method for smelting high-nickel molten iron by using low-grade laterite nickel ore; in the method, the low-grade laterite nickel ore is subjected to reduction roasting, magnetic separation and enrichment to obtain enriched ore, and then The enriched ore and low-grade laterite nickel ore participate in sintering ingredients together, and high-nickel high-grade sintered ore is obtained through sintering, and then sent to the blast furnace for smelting to obtain high-nickel molten iron. Background technique [0002] At present, the basic method of producing high-nickel iron at home and abroad is to use the RKEF method (that is, the rotary kiln roasting-electric furnace smelting method) or the rotary kiln direct reduction method. Because the production raw material is low-grade laterite ore, the amount of slag in the product is large. In the electric furnace stag...

Claims

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Application Information

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IPC IPC(8): C21B5/00C22B1/16
Inventor 潘料庭李兰兰黄学忠
Owner 潘料庭
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