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Oxygen-enriched Roasting Technology of Laterite Nickel Ore

A laterite nickel ore and oxygen-enriched roasting technology, which is applied in the field of pyrometallurgy of laterite nickel ore, can solve problems such as heavy workload, lower production efficiency, and kiln lining crusting, and achieve reduced usage, lower production costs, and stable combustion flame effect

Active Publication Date: 2017-07-04
SICHUAN JINGUANG IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, during the roasting of laterite nickel ore in the rotary kiln, the kiln lining crust will occur. When the crust reaches a certain thickness, it is necessary to stop the kiln for manual treatment. This treatment method not only requires a lot of work, but also reduces production efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 45t / h of laterite nickel ore to the rotary kiln, spray 2.5t / h of coal powder, when the oxygen content in the air in the rotary kiln is 24%, no natural gas can be used at all, the combustion flame of coal powder is stable, and the average discharge temperature is increased by 10 ℃.

Embodiment 2

[0031] a. During normal roasting, the feed rate of the rotary kiln is 45t / h, the coal injection rate is 2.5t / h, and the oxygen content in the air in the rotary kiln is 24%.

[0032] b. When the crust in the furnace lining reaches 200mm, stop feeding oxygen, so that the temperature in the kiln drops by 50°C, and re-introduce oxygen to make the rotary kiln heat up to 50°C higher than the normal roasting temperature in 5 minutes.

[0033] c. Repeat the operation of stopping and re-introducing oxygen in step b for 3 times, which can effectively remove the crust.

[0034] Before using the method provided by the invention, the crust must be manually processed once in 15 days of production. After using the method provided by the invention, manual processing is no longer required.

[0035] The oxygen-enriched roasting process of the laterite nickel ore provided by the invention is simple and flexible in operation, ensures the smooth running of the rotary kiln, reduces the amount of n...

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Abstract

The invention belongs to the field of laterite-nickel ore pyrogenic process smelting, and particularly relates to an oxygen enrichment roasting technology of laterite-nickel ore to solve the technical problems that the machining cost of smelting ferronickel through laterite-nickel ore is high, the workload of processing kiln lining crusts of a rotary kiln is large, and the production efficiency is reduced. According to the scheme solving the technical problems, the oxygen enrichment roasting technology of laterite-nickel ore is provided and comprises the following steps that a, laterite-nickel ore and pulverized coal are added in the rotary kin, and oxygen is introduced in the rotary kiln for roasting; b, when the kiln lining crusts of the rotary kiln reach 200-250 mm, oxygen stops being introduced, and when the temperature of the rotary kiln is reduced by 50 DEG C, oxygen is introduced again, and the temperature of the rotary kiln is rapidly increased to be higher than the kiln temperature during roasting by 45-55 DEG C; and c, the operation of the step b is repeated till the thickness of the lining crusts of the rotary kiln is smaller than 50 mm. According to the oxygen enrichment roasting technology of laterite-nickel ore, running of the rotary kiln is guaranteed, the usage amount of natural gas is reduced, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of pyrometallurgy of laterite nickel ore, and in particular relates to an oxygen-enriched roasting process of laterite nickel ore. Background technique [0002] The RKEF process is the most mature method for smelting ferronickel from laterite ore. The process adopts rotary kiln roasting, and then smelting in electric furnace. The purpose of rotary kiln roasting is to remove crystal water and hydroxyl groups of laterite ore, increase the temperature of raw materials entering the furnace at the same time, reduce smelting power consumption, and save production costs. The heat in the roasting process of the rotary kiln is generated by the combustion reaction of pulverized coal and air. In the production process, the combustion flame of pulverized coal will be unstable, so a natural gas transmission channel is set up in the burner, and the combustion of natural gas is used to stabilize the combustion flame, thereby stabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02
CPCC22B1/02
Inventor 向花亮潘成王文郑邦明彭志
Owner SICHUAN JINGUANG IND GRP