Facility and method for ferronickel production through coal-based powder state reduction of red soil nickel ores

Abstract

The invention discloses a facility and method for ferronickel production through coal-based powder state reduction of red soil nickel ores and belongs to facilities and methods for ferronickel production through red soil nickel ores. The method comprises the following steps that (1) powder materials are prepared and homogenized, and drying, powder grinding and homogenizing of raw ores and slag-modifiers are completed; (2) upgrading and preparing of reducing agents are conducted, coking of reduction coals is completed, and meanwhile, reducing gas is supplied; (3) the powder materials are subjected to pre-heating and pre-reduction, and ore powder and the slag-modifiers are mixed in a preheater and then subjected to drying, temperature rising and pre-reduction to prepare mixed ore materials; (4) reduction of the mixed ore materials is conducted, specifically, the mixed ore materials are restored into reduction ore materials with coal chars and reducing gas in a medium-temperature reduction kiln; (5) fusing reduction separation is conducted, specifically, slag and iron separation is achieved while the reduction ore materials complete residual reduction in a high-temperature smelting separating kiln; (6) discharging is conducted, specifically, molten ferronickel and molten slag are discharged from different passageways, and finished ferronickel products are formed; and (7) the slag is subjected to treatment, specifically, the high-temperature molten slag is cooled and circularly stirred and blended, and high-temperature waste heat is provided for preorder techniques. The method for ferronickel production through the coal-based powder state reduction of red soil nickel ores is large in productivity scale, low in cost, stable in kiln ores and high in heat utilization ratio.

Description

technical field [0001] The invention relates to a facility and a method for producing ferronickel from laterite nickel ore, in particular to a facility and a method for producing ferronickel through coal-based powder reduction of laterite nickel ore. Background technique [0002] As an important raw material for producing stainless steel, ferronickel extracted by pyrolysis from laterite nickel ore is increasingly favored by stainless steel enterprises. The mainstream process of pyrometallurgy of laterite nickel ore is the rotary kiln-submerged arc furnace method (RKEF method), that is, coke (or high-quality reduced coal) is pre-reduced in the rotary kiln, and electric heating is melted and separated in the submerged arc furnace. Since lateritic nickel ore is a low-grade ore (nickel content is generally 1%~2%), with high water content and complex gangue composition, during the process of preheating, drying, sintering and pre-reduction through the rotary kiln, the material wil...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of high energy consumption, low output, unsatisfactory working conditions and high cost in the traditional process, and to provide a facility and method for producing ferronickel by coal-based powder reduction of laterite nickel ore

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