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Production technology for smelting ferronickel from laterite-nickel ore

A technology of laterite nickel ore and production process, which is applied in the field of production process of using laterite nickel ore to smelt ferronickel, can solve the problems of low nickel recovery rate and high energy consumption, and achieve the goal of increasing roasting temperature, recovery rate and reduction effect Effect

Inactive Publication Date: 2015-03-25
偏关县晋电化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a production process for smelting ferronickel using lateritic nickel ore to solve the problem of low nickel recovery and relatively high energy consumption in the existing laterite nickel ore smelting ferronickel

Method used

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  • Production technology for smelting ferronickel from laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A production process for smelting ferronickel using laterite nickel ore, the steps are:

[0030] (1) The laterite nickel ore used as raw material contains 1.76% nickel and 21.7% iron, which is ground to 99%≤5mm and dried to a moisture content of 12%;

[0031] Based on the weight of laterite nickel ore, add 3% bentonite, 6% limestone, and 6% fluorite as additives. After drying and crushing, the water content is 8%, and the particle size is ≤5mm, accounting for 96%;

[0032] The reducing agent is coke with 10% weight of laterite nickel ore. The coke composition is 80.6% fixed carbon, 13.5% volatile matter, and 5.9% ash content. After drying and crushing, the moisture content is 10%, and the particle size is ≤5mm, accounting for 96%;

[0033] Use a cold press briquetting machine to make balls with a diameter of 30-50mm;

[0034] (2) Preheat in a preheater at a temperature of 300-400°C for 2 hours, and then enter a rotary kiln at a temperature of 1150-1200°C for 6 hours to...

Embodiment 2

[0039] A production process for smelting ferronickel using laterite nickel ore, the steps are:

[0040] (1) The laterite nickel ore used as raw material contains 2.5% nickel and 27% iron, which is ground to 95%≤5mm and dried to a moisture content of 10%;

[0041] Based on the weight of laterite nickel ore, add 4% bentonite, 5% lime, and 10% sodium fluoride as additives. After drying and crushing, the water content is 10%, and the particle size is ≤5mm, accounting for 95%;

[0042] The reducing agent is 15% by weight of lateritic nickel ore, of which 60% is coke and 40% is dust. After drying and crushing, the water content is 8%, and the particle size is ≤5mm, accounting for 97%;

[0043] Use a cold press briquetting machine to make balls with a diameter of 30-50mm;

[0044] (2) Preheat in a preheater at 420-500°C for 1 hour, then enter a rotary kiln at 1190-1250°C for 4 hours to obtain reduced calcine;

[0045](3) Send the reduced calcine and 1% coke, 2% lime, and 3% fluorit...

Embodiment 3

[0048] A production process for smelting ferronickel using laterite nickel ore, the steps are:

[0049] (1) The laterite nickel ore used as raw material contains 1.97% nickel and 16.8% iron, which is ground to 96%≤5mm and dried to a moisture content of 15%;

[0050] Based on the weight of laterite nickel ore, add 5% bentonite, 10% limestone, and 5% magnesium fluoride as additives. After drying and crushing, the water content is 9%, and the particle size is ≤5mm, accounting for 98%;

[0051] The reducing agent is 20% of the weight of the laterite nickel ore, of which coal powder accounts for 40%, dedusting ash accounts for 60%, after drying and crushing, the water content is 8%, and the particle size is ≤5mm accounting for 95%;

[0052] Use a cold press briquetting machine to make balls with a diameter of 30-50mm;

[0053] (2) Preheat in a preheater at a temperature of 380-450°C for 3 hours, and then enter a rotary kiln at 1150-1200°C for 8 hours to obtain reduced calcined san...

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Abstract

The invention discloses a production technology for smelting ferronickel from laterite-nickel ore, belongs to the technical field of ferronickel smelting, and solves problems that existing technologies for smelting the ferronickel from the laterite-nickel ore are low in nickel recovery rate and higher in energy consumption. The production technology comprises steps as follows: (1) drying, crushing, screening and then mixing the laterite-nickel ore, additives and a reducing agent in the mass ratio of 100:(13-25):(10-20) respectively to obtain spheres with the particle size ranging from 30-50 mm; (2) preheating and then sending the spheres into a rotary kiln at the temperature of 1150-1250 DEG C for high-temperature reducing roasting for 4-8 h to obtain reduced roasted ore; (3) sending the reduced roasted ore and a smelting aid into an electric furnace for smelting at the temperature of 1500-1650 DEG C for 2-3 h to obtain a finished product, that is, the ferronickel. According to the production technology, RKEF (rotary kiln-electric furnace) and direct reduction are combined, multiple additives are used, the recovery rate is high, and the energy consumption is low.

Description

technical field [0001] The invention relates to the technical field of ferronickel smelting, in particular to a production process for smelting ferronickel using laterite nickel ore. Background technique [0002] According to geological origin, nickel ore resources are mainly divided into two categories: nickel sulfide ore and laterite nickel ore. Domestic nickel ore resources are mainly nickel sulfide ore, and laterite nickel ore is very little. With the rise of nickel prices and the increasing demand for metal nickel due to economic development, the original nickel sulfide ore resources are far from meeting the market demand. my country began to import a large amount of laterite nickel ore from Indonesia, the Philippines and other Southeast Asian countries. By the end of 2010, my country had accumulated Imported nickel ore (laterite nickel ore) is 25 million tons, and it is still growing at an annual rate of more than 20% in recent years. [0003] At present, the treatmen...

Claims

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Application Information

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IPC IPC(8): C22B4/06C22B1/02
Inventor 王浩常彦鑫霍磊
Owner 偏关县晋电化工有限责任公司
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