Method for preparing low-copper molten iron by mixed melting reduction of copper slag and iron ore

Abstract

The invention discloses a method for preparing low-copper molten iron by mixed melting reduction of copper slag and iron ore. The method comprises the following processes of: putting the high-temperature molten copper slag into a reduction furnace, grinding a certain amount of slag forming agent CaO, CaCO3 and the like into certain granularity, adding the ground slag forming agent into the reduction furnace, fully melting the mixture, and standing the molten pool for 10 minutes; grinding the iron ore, quantitative additive CaF2 and CaO into certain granularity respectively, then uniformly mixing the iron ore, the CaF2 and the CaO, adding the mixture into the reduction furnace, raising the temperature of the furnace to between 1,600 and 1,700 DEG C, fully melting the materials in the furnace, and then standing the molten pool for 20 minutes; and crushing a coal reducing agent to certain granularity, spraying the crushed coal reducing agent to the molten pool by using inert gas as carrier gas through a spray gun, and performing mixed melting reduction reaction of the copper slag and the iron ore. The method greatly reduces the defect of high copper in the molten iron obtained by single copper slag melting reduction by fully using the mutual coupling effect of the components among the copper slag, the iron ore and the additive and the diluting effect of the molten iron obtained by iron ore reduction on high copper content of the molten iron obtained by copper slag reduction, and has wide applicability.

Description

technical field [0001] The invention relates to a method for preparing low-copper molten iron by mixing copper slag and iron ore through smelting reduction, and belongs to the field of resources and environment. Background technique [0002] In recent years, China's iron and steel industry has developed rapidly. my country's iron and steel industry occupies a pivotal position in the world's iron and steel industry. For more than ten years, its total iron and steel production has always occupied the first place in the iron and steel industries of all countries in the world. However, my country's iron ore resources are far from meeting the needs of the iron and steel industry, and the distribution of resources has the following characteristics: first, there are many lean ores, and the reserves of lean ores account for 80% of the total reserves; The third is that my country's iron ore resources are scarce, the grade is low, and the production capacity of steel enterprises across...

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Problems solved by technology

[0008] 2. Iron is enriched in magnetite through oxidation roasting-crushing magnetic separation process. This process has the disadvantages of low iron recovery rate and complicated follow-up treatment process

However, this process has the disadvantage that the copper in the molten iron obtained after copper slag smelting reduction is too high (the average copper content is higher than 1.5%), and if the copper content in the iron is higher than 0.2%, it will bring more serious problems to the quality of the iron. Hazard, prone to copper embrittlement

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