Blast furnace ironmaking production process by cyclically utilizing steel slag and iron slag in metallurgy and chemical industry

Abstract

The invention relates to metallurgy process, and discloses a blast furnace ironmaking production process by cyclically utilizing steel slag and metallurgic and chemical slag containing iron. The process comprises the following steps: low grade steel slag containing iron and metallurgic and chemical slag containing iron are classified and selected; the low grade steel slag containing iron with grain diameter more than or equal to 6mm, and low grade steel slag containing iron with grain diameter less than 6mm are selected from the low grade steel slag containing iron; the low grade steel slag containing iron with grain diameter less than 6mm and metallurgic and chemical slag containing iron are combined and sintered to prepare a steel slag sintering ore; the low grade steel slag containing iron with grain diameter more than or equal to 6mm and the steel slag sintering ore obtained on the step 2 are used as raw materials of blast furnace ironmaking, silica is used as a smelting additive,and coke is used as fuel to carry out blast furnace ironmaking. The process achieves modification of slag resource while sufficiently and cyclically utilizing ferritic resource, thereby realizing theaim of slag resource comprehensive utilization.

Description

technical field The invention relates to a metallurgical process, in particular to a blast furnace ironmaking production process for energy saving, emission reduction and resource comprehensive utilization. Background technique Steel slag is a large amount of industrial waste discharged from steelmaking converters or electric furnaces, accounting for about 15% of steel production. Generally, it also contains about 10% scrap steel and more than 15% iron oxide components, and is rich in Ca and Mg-rich alkaline oxide compound mineral clinker, and most of them are slag-coated iron and iron-coated slag solids. In the state of compound, it is difficult to break and grind. It is a waste of work and energy to achieve crushing, sorting and purification for reuse. Therefore, most of the low-grade iron-containing steel slags are not effectively recycled, and the recyclable ferrite resources are seriously wasted. At the same time, with the rapid development of my country's heavy chemi...

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Problems solved by technology

The purpose of the present invention is to solve the resource recycling problem of low-grade iron-containing waste slag, and provide a method of using low-grade iron-containing steel slag and metallurgical and chemical iron-containing slag as the main raw material for sintering and ore blending for blast furnace ironmaking. iron production process

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