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Method for reducing granular ferronickel through laterite-nickel ore in two-stage rotary kiln

A technology of laterite nickel ore and rotary kiln is applied in the field of non-ferrous metal metallurgy to achieve the effects of improving reduction reaction speed, high nickel grade and high nickel recovery rate

Inactive Publication Date: 2014-03-19
毛黎生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this production method has improved the ring formation of granular ferronickel produced by direct reduction of laterite ore in rotary kilns, due to improper operation and fluctuation of granular ferronickel additives, laterite ore will produce an overly viscous liquid phase in the same rotary kiln. It is inevitable that kiln rings will stick to the junction of the reduction zone of the rotary kiln and the high-temperature liquid phase zone, which cannot fundamentally solve the problem of ring formation in the production of granular ferronickel by reducing laterite nickel ore with a rotary kiln

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix the water-containing laterite nickel ore powder (Nil.41, Tfe8%) with calcareous quicklime, dry it until the water content is 7%, crush it to a maximum particle size of 5mm, add 8% of the original ore weight carbonaceous reducing agent and 7% The granular nickel-iron additives are mixed evenly, and directly sent to the first stage of rotary kiln for reduction and roasting, the temperature is controlled at 1000 ° C, and the reduction time is 5 hours. After reduction and roasting, it is sent to the second section of the same rotary kiln for high-temperature melting reduction, the temperature is controlled at 1300 ° C, and the reduction time is 3 hours. After high-temperature smelting and reduction, it is cooled to 30°C by water quenching, crushed and ball-milled to a fineness of 200 mesh, and then magnetically separated by a 2000 Gauss magnetic separator to obtain granular nickel-iron. The nickel grade can reach 15.2%, and the nickel recovery rate can reach 90.1%.

Embodiment 2

[0017] Mix the water-containing laterite nickel ore powder (Nil.8, Tfe8.2%) with 5% calcareous quicklime, dry it until the water content is 8%, crush it to a maximum particle size of 5mm, add 8% of the original ore weight carbonaceous reduction Additive and 7% granular ferronickel additives are evenly mixed, and directly sent to the first stage of rotary kiln for reduction and roasting, the temperature is controlled at 1050 ° C, and the reduction time is 4 hours. After reducing the calcined material, it is sent to the second stage of the rotary kiln for high-temperature melting reduction, the temperature is controlled at 1350 ° C, and the reduction time is 2.5 hours. After high-temperature smelting reduction, water quenching, crushing and ball milling, and then magnetic separation with a 2000 Gauss magnetic separator to obtain granular ferronickel, the nickel grade can reach 18%, and the nickel recovery rate can reach 90%.

Embodiment 3

[0019]Mix the water-containing lateritic nickel ore powder (Nil.1.75, Tfe6.3%) with 5% calcareous quicklime and dry it, crush it to less than 5mm, add 8% carbonaceous reducing agent and 7% nickel-iron additive by raw ore weight Mix evenly, and send it directly to the first section of rotary kiln for reduction and roasting, the temperature is controlled at 1100°C, and the reduction time is 3 hours. After reducing the calcined material, it is sent to the second section of the same rotary kiln for high-temperature melting reduction, the temperature is controlled at 1300 ° C, and the reduction time is 2 hours. After high-temperature smelting and reduction, it is cooled to 35°C by water quenching, crushed and ball-milled to a fineness of 200 mesh, and then magnetically separated by a 2000 Gauss magnetic separator to obtain granular ferronickel. The nickel grade can reach 20%, and the nickel recovery rate can reach 91%.

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Abstract

The invention relates to a method for reducing granular ferronickel through laterite-nickel ore in a two-stage rotary kiln. The method comprises the steps of adding a drying agent to laterite-nickel ore containing adsorption water, uniformly stirring and mixing, dehydrating and drying; crushing a mixture, adding a reducing agent and a granular ferronickel additive, uniformly mixing, and carrying out reduction roasting in a first stage of rotary kiln; and carrying out smelting reduction on materials subjected to reduction roasting in high temperature in a second stage of rotary kiln, and quenching, cooling, crushing, ball-milling and magnetically separating the materials subjected to reduction roasting to obtain the high-grade granular ferronickel. The method is simple in production, convenient to operate, low in energy consumption, low in cost and high in nickel recovery rate, and the produced ferronickel particle can be directly used as a high-quality raw material for smelting stainless steel. The method is applicable to laterite-nickel ores differing in grade and type.

Description

Technical field: [0001] The invention belongs to the field of nonferrous metal metallurgy, in particular to a method for reducing ferronickel in a two-stage rotary kiln with laterite nickel ore. Background technique: [0002] With the development of society and the advancement of science and technology, stainless steel has been widely used in the world. Traditional nickel metal is mainly extracted from nickel sulfide ore, but its resources can no longer meet the needs of society, forcing people to start from nickel resources which account for about 80% of the earth. % of laterite nickel ore to extract metallic nickel. [0003] At present, there are three techniques for extracting metallic nickel from laterite nickel ore in the world. That is: fire process, wet process, fire-wet combined process. Among them, the fire process is mainly blast furnace and rotary kiln-electric furnace smelting. The process of reduction and smelting ferronickel outside the furnace not only requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22C1/02
Inventor 毛耐文赵明会张永华
Owner 毛黎生
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