Device and method for optimizing low-grade laterite-nickel ore through gas-based direct reduction magnetic separation

A lateritic nickel ore and low-grade technology, which is applied in the field of energy-saving comprehensive utilization of mineral resources and direct reduction, can solve the problems of frustration in industrial production and application of gas-based shaft furnace technology, low nickel recovery rate, low grade of nickel alloy, and low production efficiency, etc. Ease of promotion, stable product quality, and reduced investment in environmental protection

Pending Publication Date: 2021-11-23
张雷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 requir...

Method used

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  • Device and method for optimizing low-grade laterite-nickel ore through gas-based direct reduction magnetic separation
  • Device and method for optimizing low-grade laterite-nickel ore through gas-based direct reduction magnetic separation
  • Device and method for optimizing low-grade laterite-nickel ore through gas-based direct reduction magnetic separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Ni0.85% and Fe49.17% of a low-grade lateritic nickel ore. Follow these steps:

[0091] ① Raw material treatment: sieve, granulate, dry and screen Ni0.85% and Fe49.17% laterite nickel ore raw materials to obtain granular nickel ore with a particle size of 3 to 40 mm, so that the water weight percentage is <10%;

[0092] ② Gas-based direct reduction roasting: Roast 3-40mm granular nickel mineral materials in a gas-based direct reduction roasting test kiln. The gas-based reducing gas pressure is controlled at 600-1200Pa higher than the marked pressure, and the reduction temperature in the reduction section is controlled at 930°C Left and right, the speed of the material guide impeller is 5 revolutions per hour, and the material is discharged to obtain the roasted reduced material.

[0093] ③ Roller Grinding: The obtained reduced materials are successively ground to >200 mesh through the double-roller mill, screening and extraction device, hoist, and circular grinding, and...

Embodiment 2

[0098] Ni0.86% and Fe50.23% of a low-grade lateritic nickel ore. Follow these steps:

[0099] ① Raw material treatment: Screening, granulation, drying and screening of Ni0.86% and Fe50.23% laterite nickel ore raw materials to obtain granular nickel ore with a particle size of 3 to 40 mm, so that the water weight percentage is <10%;

[0100] ② Gas-based direct reduction roasting: Roast 3-40mm granular nickel mineral materials in a gas-based direct reduction roasting test kiln. The gas-based reducing gas pressure is controlled at 600-1200Pa higher than the marked pressure, and the reduction temperature in the reduction section is controlled at 930°C Left and right, the speed of the material guide impeller is 5 revolutions per hour, and the material is discharged to obtain the roasted reduced material.

[0101] ③ Roller Grinding: The obtained reduced materials are successively ground to >200 mesh through the double-roller mill, screening and extraction device, hoist, and circula...

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Abstract

The invention relates to the technical field of energy-saving comprehensive utilization of mineral resources, and particularly relates to a device and method for optimizing low-grade laterite-nickel ore through gas-based direct reduction magnetic separation. The device comprises a kiln body; a roundabout snake-shaped flue is arranged in the kiln body from top to bottom; the snake-shaped flue is divided into a roasting preheating section, a roasting heating section and a roasting reduction section from top to bottom; a preheating material pool is arranged above the roasting preheating section; the bottom of the roasting preheating section is communicated with a vertical blanking passage; the blanking passage penetrates through the roasting heating section and the roasting reduction section and is isolated from the roasting heating section and the roasting reduction section; the bottom end of the blanking passage is communicated with an air cooling pipe; and the bottom of the air cooling pipe is connected with a material output device and a grinding magnetic separation system. According to the method disclosed by the invention, a final optimized product is obtained through raw material treatment, gas-based direct reduction roasting and grinding magnetic separation optimization; and the invention solves the problems of low reduction efficiency, long reduction heating time, high heating temperature and poor heat preservation effect in the prior art.

Description

technical field [0001] The invention belongs to the technical field of energy-saving and comprehensive utilization of direct reduction of mineral resources, and relates to a gas-based direct reduction roasting kiln and a mineral optimization method; in particular, it relates to a gas-based direct reduction magnetic separation device and 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 nicke...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B23/00
CPCC22B1/02C22B23/005
Inventor 张雷张凯玮张妍琪
Owner 张雷
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