Agglomeration method for iron containing dust slime of iron and steel plants

Abstract

The invention discloses an agglomeration method for iron containing dust slime of iron and steel plants; according to the method, the iron containing dust slime is shunted independently, is briquetted, is mixed with other iron ore powder, flux and coke powder, and then is sintered on the basis of the traditional technology. The agglomeration method comprises the following detailed steps of: 1), firstly, mixing the iron containing dust slime with composite binder, mixing uniformly, briquetting, so as to obtain dust slime briquette; 2), mixing the dust slime briquette with other iron ore powder, flux and coke powder, pelletizing, so as to obtain sintered mixture material; and 3), distributing the sintered mixture material by adopting the existing sintering method, igniting, sintering, cooling, granulating, finally the finished product of sintered ore is obtained. Compared with the traditional method of directly returning, sintering and mixing the dust slime, by adopting the agglomeration method, the ratio of the iron containing dust slime in the mixture material is greatly improved, and in addition, the sintered product quality index is improved. By adopting the agglomeration method, the problem on large-scale use of the iron containing dust slime of iron and steel plants is effectively solved, and the agglomeration method is beneficial for industrial production.

Description

technical field [0001] The invention relates to a method for utilizing iron-containing dust, in particular to a method for applying iron-containing dust in iron ore sintering in iron and steel plants. Background technique [0002] Since entering the 21st century, my country's iron and steel industry has developed rapidly. However, while the steel production is increasing year by year, a large amount of iron-containing dust is produced in the process of steel production, which has brought great harm to the human environment. In order to meet the requirements of clean iron and steel production, major iron and steel enterprises have paid more and more attention to the comprehensive utilization of iron-containing dust and sludge. According to the different utilization methods of iron-containing dust and sludge, the existing utilization methods can be roughly divided into: [0003] (1) Internal recycling in steel plants [0004] Mainly include: ① Add to sintering raw materials...

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Problems solved by technology

[0012] Based on the above methods, it can be seen that the most direct and simple way to rationally utilize iron-containing dust is to directly return and add it to the sinter mixture. However, due to the poor hydrophilicity, fine particle size and low reactivity of the dust, the ratio of its addition is generally 3 % to 5%, if it is too high, it will significantly deteriorate the sintering index; and other methods of using iron-containing dust, or the process is long, the cost is high, or the recycling effect is limited, or the added value of the product is not high