Method for optimizing low-grade laterite-nickel ore through gas-coal double-base direct reduction magnetic separation

A kind of laterite nickel ore, low-grade technology, applied in gas-coal double-base direct reduction roasting kiln and mineral selection, gas-coal double-base direct reduction magnetic separation optimization low-grade laterite nickel ore field, can solve the gas-coal double-base shaft furnace process The industrial production and application are frustrated, the nickel recovery rate is not high, the nickel alloy grade is low, and the production efficiency is low, which achieves the effect of easy promotion, huge energy-saving development potential, and reduced investment.

Pending Publication Date: 2021-11-26
张雷
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Problems solved by technology

[0003] The traditional process for processing nickel oxide ore is pyrometallurgy of nickel-iron alloy. This process mainly deals with metamorphic peridotite with high nickel grade. According to different reduction processes, it is divided into rotary kiln pre-reduction and shaft furnace reduction-submerged thermal electric furnace-refining method. However, the rotary kiln pre-reduction and the shaft furnace reduction do not constitute the direct and sufficient reduction atmosphere required by th

Method used

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  • Method for optimizing low-grade laterite-nickel ore through gas-coal double-base direct reduction magnetic separation
  • Method for optimizing low-grade laterite-nickel ore through gas-coal double-base direct reduction magnetic separation
  • Method for optimizing low-grade laterite-nickel ore through gas-coal double-base direct reduction magnetic separation

Examples

Experimental program
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Embodiment 1

[0101] A laterite nickel ore contains 0.85% Ni and 46.37% Fe. Follow these steps:

[0102] ①Raw material treatment: Ni0.85%, Fe46.37% low-grade laterite nickel ore raw materials and reducing agent coal were screened, granulated, and dried to obtain laterite nickel ore particles with a particle size of 3-40 mm and laterite nickel ore particles with a particle size of 5-10 mm. Millimeter coal particles, mix 5-10 mm coal particles in a proportion of 8%, and a particle size of 1-5 mm in proportion to 6% of re-used coal particles and 3-40 mm laterite nickel ore particles to obtain a mixed material, the weight percentage of the mixed material moisture <10%.

[0103] ②Gas-coal double-base direct reduction roasting: Roast 3-40mm nickel ore particle mixture in the gas-coal double-base direct reduction roasting test kiln, the gas-base reducing gas pressure is controlled at 600-1200Pa higher than the marked pressure, and the reduction section reduces The temperature is controlled at ab...

Embodiment 2

[0110] Ni0.97% and Fe49.41% of a low-grade lateritic nickel ore. Follow these steps:

[0111] ①Raw material processing: Ni0.97%, Fe49.41% low-grade laterite nickel ore raw materials and reducing agent coal were screened, granulated and dried to obtain laterite nickel ore particles with a particle size of 3 to 40 mm and laterite nickel ore particles with a particle size of 5 to 10 mm. Millimeter coal particles, mix 5-10 mm coal particles in a proportion of 8%, and a particle size of 1-5 mm in proportion to 6% of re-used coal particles and 3-40 mm laterite nickel ore particles to obtain a mixed material, the weight percentage of the mixed material moisture <10%.

[0112] ②Gas-coal double-base direct reduction roasting: Roast 3-40mm nickel ore particle mixture in the gas-coal double-base direct reduction roasting test kiln, the pressure of gas-base reducing gas is controlled at 600-1200Pa higher than the marked pressure, and the reduction section reduces The temperature is cont...

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Abstract

The invention relates to the technical field of energy-saving comprehensive utilization of mineral resources, in particular to a method for optimizing low-grade laterite-nickel ore through gas-coal double-base direct reduction magnetic separation. The method comprises the following specific steps of raw material treatment, carrying out reduction roasting on a material and reduction coal mixture by using a gas-coal double-base direct reduction roasting kiln; cooling a laterite-nickel ore particle material subjected to reduction roasting and sequentially passes through a coal separation recycling system, a double-roller grinding system, a Raymond grinding system and a magnetic separation system to obtain a nickel alloy product, and the mass percent of nickel contained in the nickel alloy product is that Ni is greater than 8%. According to the method, the problems of low reduction efficiency, long reduction heating time, high heating temperature and poor heat preservation effect in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of energy-saving comprehensive utilization of mineral resources direct reduction, and relates to a gas-coal double-base direct reduction roasting kiln and a mineral optimization method; in particular, it relates to a gas-coal double-base direct reduction magnetic separation method for optimizing low-grade laterite nickel ore. Background technique [0002] Nickel has the characteristics of strong corrosion resistance and good heat resistance, and has been widely used in various fields such as stainless steel and special alloy steel; at present, 60% of nickel metal in the world is extracted from nickel sulfide ore, and its production process is mature, but Nickel sulfide ore resources are decreasing day by day. With the rapid development of the stainless steel industry, the demand for nickel is also increasing. The development and utilization of laterite nickel oxide ore, which accounts for 70% of the earth's n...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B5/12C22B23/02
CPCC22B1/02C22B5/12C22B23/005C22B23/021Y02P10/20
Inventor 张雷张凯玮张妍琪
Owner 张雷
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