Method for preparing blast furnace slag micropowder by using sintering desulfuration byproducts as auxiliary materials

Abstract

The invention relates to a method for preparing blast furnace slag micropowder by using sintering desulfuration byproducts as auxiliary materials, belonging to the field of integrated utilization of key resources. The method comprises the following steps: stirring and mixing blast furnace slag output by a water-slag-washing pool of an iron mill with sintering desulfuration byproducts by a dry process and a semidry process uniformly to form a mixing material; reacting free water in the slag with free calcium oxide in the desulfuration byproducts while stirring to realize stable treatment of the free calcium oxide; drying the mixing material, oxidizing calcium sulfite in the desulfuration byproducts during the desorption of the free water to generate calcium sulfate; and passing the dried material through a grinder to form the blast furnace slag micropowder. After the desulfuration byproducts are doped into the slag, because the calcium oxide and the calcium sulfate are introduced intothe desulfuration byproducts, the invention improves the reactivity of the slag micropowder, ensures that the slag micropowder can achieve corresponding specifications of national standard, and solves the difficulty of integrated utilization of the desulfuration byproducts by the dry process.

Description

A method for preparing blast furnace slag micropowder by using sintering desulfurization by-products as auxiliary materials technical field The invention belongs to the field of comprehensive utilization of resources, and in particular relates to a method for preparing blast furnace slag micropowder by using sintering desulfurization by-products as auxiliary materials. The existing iron and steel production process is used on the basis of dry semi-dry desulfurization by-product pretreatment. It is prepared in the production of slag powder. Background technique Iron and steel enterprises are major emitters of SO2, and the SO2 emitted during the sintering process accounts for about 90% of the total SO2 emissions of the entire iron and steel enterprises. With the continuous improvement of my country's economic development and environmental protection requirements, sintering flue gas desulfurization in iron and steel enterprises is imminent. Carrying out sintering flue gas des...

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Problems solved by technology

The purpose of the present invention is to provide a method for preparing blast furnace slag powder by using sintering desulfurization by-products as auxiliary materials, using the existing iron and steel production process, using sintering dry desulfurization by-products as auxiliary materials for the production of slag fine powder, using sintering dry method The desulfurization by-products are used as auxiliary materials to produce slag micropowder. In the production process, the stabilization of calcium oxide and the oxidation treatment of calcium sulfite are realized, the reaction performance of slag powder is improved, and the problem of comprehensive utilization of dry desulfurization by-products is solved. It can realize Large-scale utilization of by-products of sintering dry process desulfurization in iron and steel enterprises

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