Equipment and method for carrying out slag-iron separation and iron reduction on refractory ore, complex ore and chemical industry ferruginous waste

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to equipment and method for carrying out slag-iron separation and iron reduction on refractory ores, complex ores and chemical industry ferruginous wastes. The equipment is provided with secondary combustion chamber between a chain grate and a rotary kiln; the top of the secondary combustion chamber is provided with an air pipeline and connected with the top of the chain grate through the air pipeline; and the bottom of the chain grate is connected with a heat recuperation fan to form a flue gas loop and is provided with a pea coal spray gun and a powdered coal spray gun on the outlet of head of the rotary kiln. The method disclosed by the invention can be used for carrying out the reduction and slag-iron separation in the rotary kiln in a pelletizing way by crushing the refractory ores, the complex ores and the ferruginous wastes. The method disclosed by the invention can be used for directly applying the low-poor refractory ores with the grade of 35%-55%, the complex ores and the ferruginous wastes, directly reducing the low-poor refractory ores with the grade of 35%-55%, the complex ores and the ferruginous wastes and then separating a high-quality reduced iron product which has the grade more than 90% and is a high-quality furnace material for substituting scrap steel, realizes the resource of the low-poor refractory ores, lays a firm foundation for the reproducibility of resources, lays a foundation for the development of short-process steel making and saves the energy resources from another aspect.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a device and method for separating and reducing iron from refractory ore, compound ore and iron-containing waste slag. Background technique [0002] my country is the world's largest steel producer. In 2012, the steel output exceeded 700 million tons, and the annual production of scrap steel was more than 90 million tons. The demand for reduced iron was 5 million tons. my country needs to import 3 million tons of reduced iron every year, and reduced iron ( Sponge iron) annual output is only 600,000 tons. my country is a country rich in lean iron ore resources. Low-lean and dull mines account for more than 97% of iron ore resources. However, 600 million tons of iron ore need to be imported from abroad every year. A large number of low-lean and dull mines in China have not been well developed. , In addition, there are hundreds of millions of tons of iron-containing wa...

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Problems solved by technology

However, due to the traditional coal-based tunnel kiln tank method, expensive refractory tanks must be used; at the same time, it has disadvantages such as high energy consumption, long reduction time, high labor consumption and low product quality, resulting in practical problems such as high production costs and poor sales. , eventually leading to a standstill in the current coal-based tunnel kiln reduced iron production

[0004] China's current tunnel kiln method and rotary kiln method to produce reduced iron products must use high-quality iron ore powder with a grade of more than 66%, and cannot directly apply low-lean ore, composite ore and iron-containing grades with a grade of 35% to 55%. Waste, resulting in a serious waste of resources

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