Method for extracting nickel and cobalt by processing poor nickel laterite

A nickel laterite and nickel-cobalt technology, applied in the direction of improving process efficiency, can solve the problems of low leaching rate of sulfuric acid leaching at atmospheric pressure, high environmental protection pressure, and magnesium can not be opened, so as to fully utilize heat energy, save energy consumption, The effect of improving equipment productivity

Active Publication Date: 2010-12-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
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Problems solved by technology

In the existing laterite ore treatment process, the reduction-ammonia leaching method is rarely used because of environmental protection issues; the pressurized sulfuric acid leaching method has a large investment and high cost, and the leaching rate of the atmospheric pressure sulfuric acid leaching method is low, and there are pressures on magnesium that cannot be opened and environmental protection. Major issues; new methods such as chlorination segregation-magnetic (floating) enrichment-acid soluble process, chlorination roasting-leaching process are in the development stage

Method used

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  • Method for extracting nickel and cobalt by processing poor nickel laterite

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Effect test

Embodiment 1

[0039] Prepare materials according to the amount of ore powder: sodium chloride: bituminous coal at 100:6:6. Put mineral powder into the larger heater and heat to 900°C; mix bituminous coal and sodium chloride, and heat the mixture to 800°C in the smaller heater; directly add the above two sets of hot materials into the heat preservation (nearly adiabatic) reactor The internal reaction is 60min., and the reaction temperature is kept above 850°C. If necessary, an appropriate amount of industrial oxygen is added to maintain the temperature. After the above pre-reduction treatment, the metallization rates of nickel-cobalt and iron are 91.3% and 15.4%, respectively.

[0040] After quenching the hot calcine with water, the nickel and cobalt in the calcine are leached while it is still hot. Adopt three-stage downstream leaching operation, the liquid-solid ratio is 3:1; the residence time of materials in each stage is 20 minutes; the temperature of the first, second, and third stage...

Embodiment 2

[0043] Prepare materials according to the ratio of ore powder: calcium chloride: bituminous coal at 100:15:10. Put mineral powder into the larger heater and heat it up to 1100°C; mix bituminous coal with calcium chloride, and heat the mixture into the smaller heater to 500°C; put the above two sets of burning materials directly into the heat preservation (nearly adiabatic) reactor The internal reaction is 30 minutes, and the reaction temperature is kept above 950 ° C. If necessary, an appropriate amount of industrial oxygen is added to maintain the temperature. After the above pre-reduction treatment, the metallization rates of nickel-cobalt and iron are 93.4% and 17.1%, respectively.

[0044]After quenching the hot calcine with water, the nickel and cobalt in the calcine are leached while it is still hot. Adopt three-stage downstream leaching operation, the liquid-solid ratio is 5:1; the residence time of each stage material is 10min; 50~70℃; preheated industrial pure oxyge...

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Abstract

The invention discloses a method for extracting nickel and cobalt by processing poor nickel laterite, which is to process poor nickel laterite by using a pre-reduction roasting-oxidizing leaching process and extracting valuable metals such as nickel and cobalt from the poor nickel laterite. By using poor nickel laterite as a starting material, the economic and high-efficiency extraction of the valuable metals such as nickel and cobalt, and the closed-loop circulation and comprehensive utilization of a metallurgical system are realized by the process steps of mineral treatment, high-temperature reduction roasting, weak acid oxidizing leaching, nickel and cobalt extraction from leachate, recovery of leaching agent and the like.

Description

technical field [0001] The invention relates to a method for extracting valuable metals such as nickel and cobalt from nickel-poor laterite ore, belonging to the field of nonferrous metallurgy. Background technique [0002] Nickel laterite is a kind of nickel oxide ore, accounting for more than 65% of the total nickel reserves; nickel laterite can be divided into limonite type and silicon-magnesium-nickel ore type. At present, the limonite-type nickel laterite ore with high iron and low magnesium is treated by hydrometallurgical process, and the silicon-magnesium ore-type nickel laterite nickel ore with high magnesium and low iron is treated by pyrometallurgical process. However, none of the existing metallurgical methods can economically process nickel-poor (Ni<1.5%) laterite ore. [0003] Due to the increasing depletion of nickel sulfide ore and the massive exploitation of nickel-rich (Ni>2.0%) laterite ore, the development and utilization of nickel-poor laterite or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B1/08C22B3/06
CPCY02P10/20
Inventor 胡启阳李新海王志兴郭华军彭文杰张云河刘久清
Owner CENT SOUTH UNIV
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