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Additive for directly reducing nickel laterite ores and application of additive

A technology of laterite nickel ore and additives, applied in the fields of metallurgy and material science, can solve the problems of high cost, harm human health, corrode equipment, etc., and achieve the effects of low cost, increased enrichment effect, and strong market promotion prospects.

Inactive Publication Date: 2014-01-22
TAIZHOU YONGXING ALLOY MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to directly reduce lateritic nickel ore and enrich nickel elements, many additives have been developed one after another, but there are problems such as high cost, polluting the environment, corroding equipment, and harming human health.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Select laterite nickel ore containing 1.5% nickel, TFe35%, moisture content 15.35%, first dry it and then crush, crush and grind, according to the quality of laterite nickel ore 20%, 7%, 6%, 3% , 3% were added NCS additive, sodium sulfate, calcium carbonate, sodium phosphate, soda ash, borax, mixed, agglomerated; Ningxia bituminous coal was added as a reducing agent, and reduced at 1246 ° C for 95 minutes to obtain a reduced product; the reduced product was cooled to At room temperature, the cooled reduction product is crushed and ground to -0.082mm, accounting for 80% of the powder; the above powder is magnetically separated at a magnetic field strength of 1200Gs, and the product obtained is nickel-iron alloy powder. The nickel grade in the obtained nickel-iron alloy powder is 5.65%, the nickel recovery rate is 88.5%, the iron grade is 77.32%, and the iron recovery rate is 78.5%.

[0017]

Embodiment 2

[0019] Select laterite nickel ore containing 1.5% nickel, TFe35%, moisture content 15.35%, first dry it and then crush, crush and grind, according to the quality of laterite nickel ore 15%, 5%, 2%, 1% , 2% were added NCS additives, sodium sulfate, calcium carbonate, sodium phosphate, soda ash, borax, mixed, and agglomerated; Ningxia bituminous coal was added as a reducing agent, and reduced at 1200 ° C for 100 minutes to obtain a reduced product; the reduced product was cooled to At room temperature, the cooled reduction product is crushed and ground to -0.082mm, accounting for 85% of the powder; the above powder is magnetically separated at a magnetic field strength of 1800Gs, and the product obtained is nickel-iron alloy powder. The nickel grade in the obtained nickel-iron alloy powder is 7.65%, the nickel recovery rate is 89.5%, the iron grade is 78.32%, and the iron recovery rate is 79.5%.

[0020]

Embodiment 3

[0022] Select laterite nickel ore containing 1.5% nickel, TFe35%, moisture content 15.35%, first dry it and then crush, crush and grind, according to the quality of laterite nickel ore 25%, 10%, 10%, 5% , 5% were added NCS additives, sodium sulfate, calcium carbonate, sodium phosphate, soda ash, borax, mixed, and agglomerated; Ningxia bituminous coal was added as a reducing agent, and reduced at 1223°C for 100 minutes to obtain a reduced product; the reduced product was cooled to At room temperature, the cooled reduction product is crushed and ground to -0.082mm, accounting for 83% of the powder; the above powder is magnetically separated at a magnetic field strength of 1800Gs, and the product obtained is nickel-iron alloy powder. The nickel grade in the obtained nickel-iron alloy powder is 7.95%, the nickel recovery rate is 90.5%, the iron grade is 88.32%, and the iron recovery rate is 89.5%.

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PUM

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Abstract

The invention discloses an additive for directly reducing nickel laterite ores, which is mainly prepared from an NCS additive, sodium sulfate, calcium carbonate, sodium phosphate, soda ash and borax respectively according to proportions of 15 to 25 percent, 5 to 10 percent, 2 to 10 percent, 1 to 5 percent and 2 to 5 percent of mass of the nickel laterite ores. The invention also discloses a method for preparing ferro-nickel alloy powder by the additive. The NCS of the additive is in contact with water in the nickel laterite ores to release more Ca and Al high valence cations and the Ca and Al high valence cations neutralize negative charges of cosmid, so that a diffusion layer is thinned and an enrichment effect of ferro-nickel is improved. In the reducing process, the additive reacts with the nickel laterite ores and breaks the structure of the nickel laterite ores, and a high-enrichment ferro-nickel element is obtained. Compared with other additives, the additive not only has low cost and is environmental-friendly, but also cannot corrode equipment and has wide market popularization prospect.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and material science, in particular to an additive for direct reduction of laterite nickel ore and its application. Background technique [0002] Nickel is mainly used in the production of stainless steel, and about 70% of the stainless steel currently used is austenitic stainless steel. Because the grade of nickel in laterite nickel ore is low, and nickel exists in isomorphic form instead of independent minerals, it is difficult to be enriched by physical beneficiation. There are two main treatment processes for laterite nickel ore industrial application: wet method and fire method. The main chemical components of lateritic nickel ore include Ni, Co, Cr 2 o 3 , Fe, MgO, SiO 2 、Al 2 o 3 , Mn , S , P, etc. In order to directly reduce lateritic nickel ore and enrich nickel elements, many additives have been developed successively, but there are problems such as high cost, environmental pol...

Claims

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Application Information

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IPC IPC(8): C22B5/10C22B1/14
Inventor 宗义正
Owner TAIZHOU YONGXING ALLOY MATERIAL TECH
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