重庆科技学院本科生毕业设计 ABSTRACT

ABSTRACT

Flux is one of the slag forming substances in the process of blast furnace.It can be divided alkaline flux,neutral flux and acidic flux according to their nature.the gangue components of the iron ore in China contains a large amount of SiO2,so we usually use the alkaline flux contain CaO and MgO.Not only it can improve the sintering process, enhance sintering, improve sinter quality, but also can provide high alkalinity sinter to the blast furnace by adding flux in the sintering production.Limestone is one of the sintering flux commonly used，and the appropriate size has an important effect to the mineralization of sinter, getting the best blast furnace burden, improving smelting efficiency.Sintering production is strict with the granularity of flux,generally,we require the content of 0 ~ 3mm should be larger than 85%, less than 3mm must be larger than 90% and less than 0.125mm mustn`t be larger than 20%.The size of limestone and dolomite should be less than 3mm, to ensure that it can be fully decomposed and mineralization in the sintering process.

The article focuses on the inappropriate particle size of limestone for processing on the basis of the limestone with stationary source and fixed size.The design process was demonstrated in the limestone entering the factory (0 ~ 50mm) crushing and screening to meet our production targets required size (0 ~ 3mm).

The process we use is one-part form crushing and screening with examination screening,it is simple, efficient and high yield.The flux handling system operating rate is 76%,and the 0 ~ 3mm grain content in the end product is 90%. Keywords: limestone;one-part form;granularity;crushing and screening