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Method for enriching nickel iron ore concentrate from laterite type nickel ore by means of rotary kiln

A technology for laterite nickel ore and nickel-iron concentrate, which can be applied to rotary drum furnaces, furnace types, furnaces, etc., can solve the problems of loss of iron, acid consumption of iron, and increased costs, so as to reduce the cost of smelting, reduce the cost of auxiliary materials, reduce The effect of pollution

Inactive Publication Date: 2008-12-17
HONGHE HENGHAO MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Using wet extraction nickel technology, iron consumes acid and then must be removed, which increases cost and loses iron

Method used

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  • Method for enriching nickel iron ore concentrate from laterite type nickel ore by means of rotary kiln
  • Method for enriching nickel iron ore concentrate from laterite type nickel ore by means of rotary kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) The composition of laterite nickel ore in Indonesia is as follows (each component is weight%): Ni 1.67%, Co 0.019%, MgO 15.83%, Fe 2 o 3 15.83%, SiO 2 52.09%, Al 2 o 3 2.99%, Cr 2 o 3 0.39%,

[0022] 2) Process conditions for implementation: 120 tons of laterite nickel ore in Indonesia, Raymond crushed to -120 mesh, accounting for 70%, adding 10% carbonaceous reducing agent by original ore weight, 5% sodium chloride, 5% limestone powder, 0.5% pyrite Mineral powder, stir evenly, add water, enter the ball press machine to press into pellets with a diameter of 50mm, enter the rotary kiln, control the temperature in the high temperature zone at 1150-1200°C and roast for 1.5 hours. The abrasive fineness is controlled to be -120 mesh and 50% to 70% of the content enters the ball mill for treatment, followed by continuous magnetic separation with a magnetic separator. Control the pulp concentration of the magnetic separator to be 20-40%, and the continuous magnet...

Embodiment 2

[0024] 1) The composition of laterite nickel ore in Indonesia is as follows (each component is weight%): Ni 1.12%, Co 0.017%, MgO 15.83%, Fe 2 o 3 20.83%, SiO 2 52.09%, Al 2 o 3 2.99%, Cr 2 o 3 0.39%;

[0025] 2) Process conditions for implementation: 30 tons of Indonesian laterite nickel ore, Raymond crushed to -120 mesh > 60%, add 5% carbonaceous reducing agent, 10% sodium chloride, 5% limestone powder by weight of the original ore, stir well and then add Water enters the ball press machine to press into 40mm pellets, enters the rotary kiln, and roasts at a temperature of about 1150°C for 1 hour. The roasted materials are quenched in water and coarsely broken. 70% enters the ball mill for treatment, followed by continuous magnetic separation by magnetic separator. Control the pulp concentration of the magnetic separator to be 20-40%, and the continuous magnetic separation system processes 5-10 tons of roasted materials every day, and takes samples for analysis eve...

Embodiment 3

[0027] 1) The composition of laterite nickel ore in Indonesia is as follows (each component is weight%): Ni 1.67%, Co 0.019%, MgO 15.83%, Fe 2 o 3 15.83%, SiO 2 52.09%, Al 2 o 3 2.99%, Cr 2 o 3 0.39%;

[0028]2) Process conditions for implementation: 20 tons of laterite nickel ore in Indonesia, Raymond crushed to -120 mesh > 60%, adding 5% carbonaceous reducing agent by original ore weight, 5% sodium chloride, 2% limestone powder, 0.5% pyrite Mineral powder, 0.5% fluorite, stir evenly, add water, enter the ball press machine to press into 50mm pellets, enter the rotary kiln, the temperature in the high temperature zone is controlled at about 1200 ° C for 2 hours, and the roasted materials are quenched by water. After crushing, control the abrasive fineness to -120 mesh and 50% to 70% of the content and enter the ball mill for treatment, followed by continuous magnetic separation with a magnetic separator. Control the pulp concentration of the magnetic separator to b...

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Abstract

The invention relates to a method for collecting ferronickel concentrate from lateritic nickel ores by a rotary kiln. The lateritic nickel ores are crushed, stirred and mixed with a carbonaceous reducing agent and a compound additive, made into pellets by a ball press or a marble machine and put into the rotary kiln for reducing and roasting; waste heat at the front part of the rotary kiln is used for carrying out the drying and preheating of the pellets; the high-temperature area of the rotary kiln is 9 to 10 meters away from a kiln outlet; the temperature of the high-temperature area is controlled to be 1000 to 1300 DEG C; roasting time is 0.5 to 2 hours; the dried pellets enter the high-temperature area of the rotary kiln for reducing and roasting; a magnetic separator with a magnetic field intensity of 3000 to 5000 gauss is adopted to sort roasted material obtained after water quenching and wet ball milling, thus obtaining high-content ferronickel concentrate; the method can realize the simultaneous recycling of nickel and iron and obtain the high-content ferronickel concentrate; the content of nickel is 5 to 13 percent and the recycling rate of nickel is 85 to 93 percent; the content of iron is 30 to 75 percent and the recycling rate of nickel is 60 to 85 percent; the reasonable utilization of the waste heat during process procedure achieves the purposes of saving energy and reducing discharge and greatly reduces pollution to the environment.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal metallurgy, in particular to a method for enriching nickel-iron concentrate with laterite nickel ore in a rotary kiln. Background technique [0002] Due to the recovery of the world economy and the huge demand of the stainless steel industry, the global demand for nickel metal continues to increase, which in turn leads to a continuous rise in the price of nickel. In 2006, LME's nickel price hit a record high of 16 years, reaching US$47,500 / ton. Nickel production investment is also very active. In this case, how to grasp the economics of developing laterite nickel ore has become very important. [0003] The world's terrestrial nickel reserves are about 470 million tons, of which 39.4% exist in the form of sulfide ore, and 60.6% exist in the form of oxide ore. Nickel sulfide reserves account for only 40% of the global nickel reserves, but provide 60% of the total nickel production. With the rapi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/216C22B23/00
Inventor 郭伯章高永斌朱星荣李跃光张明仙
Owner HONGHE HENGHAO MINING
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