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Process for producing bead ferronickel by rotary hearth furnace through coal-based reduction of red soil nickel oxide ores

A technology of nickel oxide ore and rotary hearth furnace, applied in fluidized bed furnaces, furnaces, furnace types, etc., can solve the problems of difficult control requirements of rotary kiln, low utilization coefficient of blast furnace, low metal recovery rate, etc. The effect of large-scale production application, low production cost and high metal recovery rate

Active Publication Date: 2014-12-03
SICHUAN JINGUANG IND GRP
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, the processing methods of lateritic nickel oxide ore mainly include hydrometallurgy and pyrometallurgy. The hydrometallurgical processes mainly include reduction roasting-ammonia leaching process and pressurized acid leaching process, but hydrometallurgy has a low metal recovery rate. , the environmental pollution is relatively serious and there are high requirements for equipment, scale, investment, operation control, etc., so it is difficult to popularize
The fire process mainly includes blast furnace production process, rotary kiln production process, and electric furnace reduction smelting production process, but there are generally disadvantages such as low utilization coefficient of blast furnace, difficult control requirements of rotary kiln, high energy consumption of electric furnace, etc., and coke is required as a reducing agent
At present, the rotary kiln-electric furnace smelting (RKEF) process implemented by combining these pyrometallurgical processes is widely used, but limited by power resources, coke resources and transportation costs, this process can only be used under the conditions of electricity, coke and transportation. Relatively convenient regional promotion and application

Method used

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  • Process for producing bead ferronickel by rotary hearth furnace through coal-based reduction of red soil nickel oxide ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Philippine laterite nickel oxide ore (No. 1) composition: Ni1.106%, TFe 48.14%, CaO 2.66%, MgO 3.43%, SiO 2 8.42%, P 0.0037%, coarsely crush the raw ore to less than 100mm, dry at 300°C until the water content is 20%, and then finely crush it to less than 1mm, add 2% fluorite, 31% anthracite, and quicklime to adjust the alkalinity (CaO+ MgO) / SiO 2 0.92, SiO 2 / MgO at 2.4, then mix the materials for 10 minutes and then pelletize. The moisture content of the pellets is 21%. The wet pellets are dried at 250°C for 80 minutes. After drying, they enter the rotary hearth furnace for reduction. For 40 minutes, the product was water quenched and magnetically separated after being released from the furnace. The magnetic separation intensity was 2000 gauss, and the pearl nickel-iron alloy product was obtained. The composition was Ni 2.35%, Fe 92%, Si 0.28%, P 0.014%, C 1.87%, S 0.504 %, the recovery rate of Ni in ferro-pearl reaches 94.62%, and the recovery rate of Fe reaches 84...

Embodiment 2

[0030] Indonesian laterite nickel oxide ore (No. 2) composition: Ni 1.62%, TFe 12.96%, CaO 3.08%, MgO 17.53%, SiO 2 46.59%, P 0.0065%, coarsely crush the raw ore to less than 100mm, dry at 250°C until the water content is 21%, and then finely crush it to less than 1mm, add 2% fluorite, 10% anthracite, and quicklime to adjust the alkalinity (CaO+ MgO) / SiO 2 0.74, SiO 2 / MgO at 2.63, and then mixed for 5 minutes before pelletizing, the moisture content of the pellets was 22%, and the wet pellets were dried at 300°C for 60 minutes. After drying, they entered the rotary hearth furnace for reduction. For 40 minutes, the product was water quenched and magnetically separated after being released from the furnace. The magnetic separation intensity was 3000 gauss, and the pearl nickel-iron alloy product was obtained. The composition was Ni 23.57%, Fe 73%, Si 0.20%, P 0.015%, C 1.71%, S 0.420 %, the recovery rate of Ni in ferro-pearl reaches 90.79%, and the recovery rate of Fe is 33....

Embodiment 3

[0032] Indonesian laterite nickel oxide ore (No. 3) composition: Ni 1.94%, TFe 25.36%, CaO 3.22%, MgO 12.8%, SiO 238.89%, P 0.02%, roughly crush the raw ore to less than 100mm, dry at 300°C until the water content is 19%, and then finely crush it to less than 1mm, add 2% fluorite, 17% anthracite, and quicklime to adjust the alkalinity (CaO+ MgO) / SiO 2 0.71, SiO 2 / MgO at 3.03, then mix the materials for 8 minutes and then pelletize. The moisture content of the pellets is 20%. The wet pellets are dried at 250°C for 60 minutes. After drying, they enter the rotary hearth furnace for reduction. For 40 minutes, the product was water quenched and magnetically separated after being released from the furnace. The magnetic separation intensity was 3000 gauss, and the pearl nickel-iron alloy product was obtained. The composition was Ni 8.57%, Fe 87%, Si 0.25%, P 0.028%, C 1.08%, S 0.643 %, the recovery rate of Ni in ferro-pearl reached 90.18%, and the recovery rate of Fe was 69.03%. ...

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Abstract

The invention discloses a process for producing bead ferronickel by a rotary hearth furnace through coal-based reduction of red soil nickel oxide ores, which is capable of reducing the production cost and belongs to the technical field of production of iron alloys. The process comprises the following steps of: a, after finely crushing, dosing, mixing and pelletizing raw red soil nickel oxide ores, reducing coal and a flux, drying to obtain dry balls; b, reducing the dry balls into the rotary hearth furnace, and carrying out water quenching, cooling, crushing and magnetic separation on the discharged high-temperature clinker so as to obtain a bead ferronickel alloy and slag. According to the invention, the rotary hearth furnace is taken as a reducing device, non-coking coal with cheap price and wide resource distribution is directly taken as a reducing agent, and coal gas is taken as main energy, so that the production cost is low, the process is applied to a construction plant of a mine region with power resource scarcity, the restriction condition of higher transportation cost of raw materials of the conventional factory is overcome, the process is simple and easy to operate and put into large-scale production application, and the obtained bead ferronickel has high nickel grade and high metal recovery rate, and is a high-quality raw material for producing stainless steel.

Description

technical field [0001] The invention belongs to the technical field of ferroalloy production, and in particular relates to a process for producing ferro-pearl through coal-based reduction of laterite nickel oxide ore in a rotary hearth furnace, which can reduce production costs. Background technique [0002] With the rapid development of stainless steel demand and industry, the nickel metal industry, one of its main raw materials, has also risen rapidly in recent years. Nickel resources mainly exist in two forms of sulfide ore and oxide ore. The global laterite nickel oxide ore (also known as laterite nickel ore, nickel oxide ore or laterite ore) reserves account for about 72% of nickel resources, and sulfide ore accounts for about 28%. Therefore Laterite nickel oxide ore has gradually become the main raw material for extracting nickel metal. At present, the processing methods of lateritic nickel oxide ore mainly include hydrometallurgy and pyrometallurgy. The hydrometallur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/00C22C38/08C21B13/00
Inventor 王涛向花亮邓小东鲍呈伟
Owner SICHUAN JINGUANG IND GRP
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