Method for fluidized drying and synchronous pre-reduction of laterite-nickel ore

A laterite nickel ore and fluidization technology, applied in the field of metallurgy, can solve the problems of high energy consumption, low efficiency, singleness, etc., and achieve the effects of improving production efficiency, shortening the process flow, and reducing energy consumption

Inactive Publication Date: 2013-07-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] At present, the drying and pre-reduction technologies of laterite nickel ore are relatively independent and single, and there are problems such as high energy consumption and low efficiency.

Method used

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  • Method for fluidized drying and synchronous pre-reduction of laterite-nickel ore

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Embodiment 1

[0019] A laterite nickel ore in Yunnan was selected as the raw material. The water content of the raw ore was 26%. The raw ore was dried and vertically milled, and the laterite nickel ore powder with a particle size of less than 1mm was loaded into the third-stage reactor after drying the vertical mill. Mineral powder passes through the first-stage reactor, the second-stage reactor, and the third-stage reactor in sequence. The temperature of the first-stage reactor is 300°C, the temperature of the second-stage reactor is 500°C, and the temperature of the third-stage reactor is The temperature is 800°C, and the residence time of mineral powder in each reactor is 3-5 minutes.

[0020] The heat source of the reactor is mainly provided by the combustion chamber, which uses pulverized coal as fuel for combustion, and the reducing hot air generated first enters the third-stage reactor, then enters the second-stage reactor, and finally is discharged from the first-stage reactor. The ...

Embodiment 2

[0023] A laterite nickel ore in Yunnan was selected as the raw material. The water content of the raw ore was 29%. The raw ore was dried and vertically milled, and the laterite nickel ore powder with a particle size of less than 1mm was loaded into the fifth-stage reactor after drying the vertical mill. Mineral powder passes through the first to fifth reactors in turn. The temperature of the first reactor is 200°C, the temperature of the second reactor is 300°C, the temperature of the third reactor is 500°C, and the temperature of the fourth reactor is The temperature of the reactor is 700°C, the temperature of the fifth-stage reactor is 900°C, and the residence time of the ore powder in each stage of the reactor is 2 to 3 minutes.

[0024] The heat source of the reactor is mainly provided by the combustion chamber, which uses pulverized coal as fuel, and the reducing hot air generated first enters the fifth-stage reactor, then enters the fourth, third, and second-stage reactor...

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Abstract

The invention discloses a method for fluidized drying and synchronous pre-reduction of laterite-nickel ore, wherein the two processes of drying and pre-reduction of the laterite-nickel ore are synchronously completed in a multistage reactor and the fluidized drying and the synchronous pre-reduction of the laterite-nickel ore are realized. Reductive hot air which is generated in a combustion chamber is used as a drying medium and a reducing agent; the temperature of the reductive hot air is 900-1100DEG C; and the reductive hot air includes a certain amount of reductive gases CO and H2. The laterite-nickel ore orderly enters the multistage reactor after being dried and vertically grinded; by the reductive hot air, the mineral powder particles are driven to suspend in the reactor; and the laterite-nickel ore is synchronously dried and pre-reduced so that hot mineral powder is produced. By adopting the method, the pre-reduction rate of the metallic nickel in the laterite-nickel ore is 50-80%, the pre-reduction rate of the metallic iron is 30-60%, the water content of the dried mineral powder is below 5% and the drying time is greatly shortened. With the invention, the smelting time isshortened, the smelting energy consumption is reduced, the system capacity is improved, therefore, an efficient and energy-saving method is provided for the drying and the pre-reduction of the laterite-nickel ore.

Description

technical field [0001] The invention relates to the field of metallurgy technology, in particular to a highly efficient and energy-saving method for drying and pre-reducing laterite nickel ore, in particular utilizing fluidization technology to realize synchronous drying and pre-reduction of laterite nickel ore in a multi-stage reactor. In order to improve the drying effect of ore powder and the pre-reduction rate of valuable metals. technical background [0002] Nickel is an important strategic resource in various countries and is widely used in special steel, electroplating, petrochemical catalysts, battery materials and other fields. Among them, the nickel demand for stainless steel production accounts for 65% of the global nickel demand. At present, nickel sulfide ore is mainly smelted to obtain metal nickel at home and abroad, but the reserves of nickel sulfide ore are limited and most of them have been developed. There are rich reserves of laterite nickel ore in the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B1/00
Inventor 王华王炜魏永刚李博胡建杭尹久发
Owner KUNMING UNIV OF SCI & TECH
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