Production method for smelting high carbon chromium iron by using carbonaceous combination reducing agent

Abstract

The invention discloses a production method for smelting high carbon chromium iron, belonging to the technical field of ferroalloy smelting. By adopting the production method, the consumption and comprehensive energy consumption of a carbonaceous reducing agent can be reduced. The production method is characterized in that the particle size, moisture and volatile matters are controlled by pretreatment measures through the reasonable matching of semi-coke, anthracite and metallurgical coke; the air permeability of furnace charge is ensured through the agglomeration treatment of ores so as to provide conditions for the matching of lots of semi-coke and coal; the uniformity is improved through batch-wise quantity control burdening and two-times mixing; the burdening error is reduced; the thickness of feed is controlled so as to ensure that the thickness of an in-furnace raw material layer is within 600mm, and the air permeability of the material layer is ensured; meanwhile, moisture in raw materials added to a furnace is timely dried under the effect of the high temperature of a charge level, the raw materials are preheated very well, and the air permeability of the furnace charge is further improved by pricking holes on the charge level. According to the production method, the carbonaceous combination reducing agent can be used for the smelting of slag-process high carbon chromium iron through the comprehensive measures, meanwhile, the consumption cost of the reducing cost is reduced, and the power consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of ferroalloy smelting, and in particular relates to a method for smelting high-carbon ferrochrome that can reduce the consumption of carbonaceous reducing agents and comprehensive energy consumption. Background technique [0002] For the ferroalloy smelting industry, there are mainly three types of carbonaceous reducing agents used, charcoal: such as sawdust, charcoal; coal coke: gas coal coke, metallurgical coke, low temperature coke (blue coke), lignite coke, anthracite, bituminous coal, etc.; petroleum Coke: petroleum delayed coke, etc. [0003] The selection principle of reducing agent for ferroalloy smelting: suitable physical and chemical properties, low price, wide sources and other factors. The physical and chemical performance indicators of carbonaceous reducing agents are mainly: chemical reactivity, mechanical strength, resistivity, fixed carbon content, ash content, impurity element content, et...

AI Technical Summary

Problems solved by technology

[0006] First, the moisture and volatile content are high, and the material surface at the furnace mouth is prone to fire, slag turning, and even explosion, which affects the compliance of the production process and threatens safe production;

[0007] The second is that the mechanical strength is low, the burning loss in the furnace is large, and it is easy to cause carbon deficiency in the furnace, which affects the reduction of ore, resulting in a low recovery rate of the main elements and causing economic losses.

However, the reduction performance is relatively poor, and the resistivity is small, which is not conducive to the deep insertion of the smelting electric furnace electrode, resulting in high furnace temperature; its price is also high, resulting in high cost

Semi-coke and coal are low in price, high in specific resistance, high in chemical activity, low in ash content, low in S, P, and Al, but high in volatile content and low in mechanical strength.

Because it is semi-coke, with high volatile content and low mechanical strength, it is difficult to control the furnace conditions in the high-carbon ferrochrome smelting process, so it has not been successfully applied.

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