Method for reducing nickel ore by using reducing rotary kiln and producing ferronickel by rusting electric furnace

Abstract

The invention relates to a method for reducing nickel ore by using a reducing rotary kiln and producing ferronickel by rusting an electric furnace, which comprises the following steps: placing red soil ferronickel ore, reducing coal, a desulfurizing agent and additives into the rotary kiln for direct reduction, further performing selection, rusting, and smelting the high-grade ferronickel by the electric furnace, wherein the nickel grade is not less than 20%; and simultaneously recovering ferric oxide red, and using a waste material to manufacture burning-free bricks. The process flow is as follows: preparing raw materials, directly reducing via the rotary kiln, cooling via a cooling kiln, performing the selection, rusting, and smelting by the electric furnace. The particle size of the coal is required to be not more than 15mm, the particle size of lime is less than 2mm, primary air and secondary air are adopted for burning the coal, the calcination time is 2.5-9 hours, the temperature in the kiln is 500-1180 DEG C, the materials are cooled to below 38 DEG C by the cooling kiln, the selection is performed for removing impurities, the rusting is performed for removing the impurities, the smelting is performed by the electric furnace, and then the nickel content in the ferronickel is not less than 20%. The method is simple, the technology is advanced, the energy conservation and the emission reduction are realized, the cost is low, the quality is high, and the degree of mechanization and the degree of automation are high, large-scale production is benefited, large market is achieved, the competitiveness is strong, environment friendliness is achieved, significant economic benefits is obtained, good social benefits and environment-friendly effect are achieved, and further a new way for refining nickel from the red soil ore is .

Description

technical field [0001] The invention relates to a method of directly reducing laterite nickel ore with a reducing rotary kiln, rusting, and melting ferronickel in an electric furnace Background technique [0002] There are many laterite nickel ores in Southwest my country and Southeast Asia, which are of low grade, difficult to beneficiate, and high in production cost, so they cannot be utilized. Contents of the invention [0003] The object of the present invention is to adopt a dressing and smelting method with high mechanization degree, strong impurity removal ability, low production cost, high nickel grade, green environmental protection, and mature and reliable technology for the above mineral species. [0004] The technical solution of the present invention is to add the components of laterite nickel ore, reduced coal, desulfurizer and nickel-iron collection additive into the reduction rotary kiln according to the weight ratio, and reduce the materials, isolate the a...

AI Technical Summary

Problems solved by technology

[0002] There are many laterite nickel ores in Southwest my country and Southeast Asia, which are of low grade, difficult to beneficiate, and high in production costs, so they cannot be utilized

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