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Method for reducing nickel ore by using reducing rotary kiln and producing ferronickel by rusting electric furnace

A production method and technology of rotary kiln, applied in rotary drum furnace, furnace, furnace type and other directions, can solve the problems of high production cost, difficult beneficiation, unavailability, etc., and achieve low cost, significant economic benefits, and good environmental protection effects.

Inactive Publication Date: 2014-07-16
李维成 +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] There are many laterite nickel ores in Southwest my country and Southeast Asia, which are of low grade, difficult to beneficiate, and high in production costs, so they cannot be utilized

Method used

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  • Method for reducing nickel ore by using reducing rotary kiln and producing ferronickel by rusting electric furnace

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Embodiment Construction

[0024] A raw material preparation

[0025] Use laterite nickel ore with nickel content ≥0.4%, iron content ≤20%, sulfur content <2% as the base material, select sulfur content ≤0.5%, calorific value ≥7000 kcal, coking index <2, volatile matter ≥34 % of coal is used as reducing coal and fuel injection coal.

[0026] Coal particle size ≤ 15 mm, choose lime with sulfur content < 0.3% as desulfurizer, particle size < 2 mm, the weight ratio of the four components of laterite nickel ore, coal, lime, and additives is nickel ore: 15-80 parts, coal: 15 parts, lime: 1 part, additives: 0.5 parts.

[0027] B, 80 parts of ore in the present embodiment, 15 parts of coal, 1 part of lime, 0.5 part of additive.

[0028] According to the composition ratio, add the ingredients into the kiln from the kiln tail, then spray 15 parts of coal into the kiln head, and add compressed air at the same time, the air volume is 40m 3 / min, the wind pressure is controlled at 60000Pa, and the secondary air ...

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Abstract

The invention relates to a method for reducing nickel ore by using a reducing rotary kiln and producing ferronickel by rusting an electric furnace. The production method comprises the processes of: preparing raw materials, directly reducing via the rotary kiln, cooling via a cooling kiln, selecting, rusting, and smelting by the electric furnace. The method of the invention solves the technology problem of low grade and large beneficiation difficulty in the laterite-nickel ores in the southwest district of China and Southeast Asia district. By using the low grade ore, the ferronickel with nickeliferous grade >= 20-50% can be produced, the iron oxide red can be comprehensively recovered, and baking-free bricks can be produced by using waste slags. The method has high mechanization degree and automation degree, strong roguing performance, low production cost, and high nickel grade of the products, meanwhile the production technology also has characteristic of green and environment protection.

Description

technical field [0001] The invention relates to a method of directly reducing laterite nickel ore with a reducing rotary kiln, rusting, and melting ferronickel in an electric furnace Background technique [0002] There are many laterite nickel ores in Southwest my country and Southeast Asia, which are of low grade, difficult to beneficiate, and high in production cost, so they cannot be utilized. Contents of the invention [0003] The object of the present invention is to adopt a dressing and smelting method with high mechanization degree, strong impurity removal ability, low production cost, high nickel grade, green environmental protection, and mature and reliable technology for the above mineral species. [0004] The technical solution of the present invention is to add the components of laterite nickel ore, reduced coal, desulfurizer and nickel-iron collection additive into the reduction rotary kiln according to the weight ratio, and reduce the materials, isolate the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B11/06C21B11/10
CPCY02P10/20
Inventor 李维成王金槐李睿昌晶
Owner 李维成
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