Method for improving qualification rate of mineral powder of slag vertical mill

Abstract

The invention discloses a method for improving the qualification rate of mineral powder of a slag vertical mill. The method comprises the following steps: adjusting an operation process from the operation of firstly drawing negative pressure and then igniting to the operation of firstly igniting and then drawing the negative pressure at the beginning of milling; adjusting the impurity content in materials entering the mill, transforming a discharging chute and controlling the volume of slag entering the mill to be less than 20mm<3>; adjusting the iron content in the materials entering the mill, increasing an iron remover in the conveying process for feeding the materials into the mill, and controlling the iron content in the slag entering the mill to be less than 0.05%; improving the sealing property of a powder concentrator, sealing a gap of a grader with rubber, improving the powder concentration efficiency of the powder concentrator, controlling the powder concentration efficiency to achieve the level that the content of 45mu m screen residues is not more than 1.0%, and controlling the qualification rate to be above 80%; and restoring a milling roller and a milling plate, performing overlay welding on the milling roller and the milling plate, performing regular maintenance on the milling roller and the milling plate, recording the abrasion situation in a detailed manner, performing periodic overlay welding and performing maintenance work. By adopting the method for improving the qualification rate of the mineral powder of the slag vertical mill, the advantages of reasonable equipment structure, simple operation process and low content of impurities can be realized.

Description

technical field [0001] The invention relates to the technical field of cement processing, in particular to a method for improving the pass rate of slag vertical mill ore powder. Background technique [0002] The slag vertical mill production line of the No. 3 Branch Plant of Guangxi Yufeng Cement Co., Ltd. was established in October 2010 and officially put into production in December of the same year. The hourly output is 90 tons, and the annual output is 600,000 tons. According to the requirements of the slag fineness index: 45μm sieve residue ≦ 1.0%, according to statistics, from the start of production of the slag vertical mill to February 2012, the pass rate of the finished product fineness is about 20%. [0003] According to the requirements of the indicators: the specific surface area of ​​the ore powder after grinding: ≧450m2 / kg, and the 45μm sieve residue of the finished ore powder is ≦1.0%. From January 2011 to February 2012, the fineness pass rate of slag vertica...

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Problems solved by technology

[0005] After all members of our team personally went to the site to observe, investigate, measure, count, and analyze, we confirmed that the reasons for the low pass rate of slag vertical mill powder fineness were classified into five main factors: improper operation methods, There are many impurities, high iron content in the grinding material, poor sealing of the powder classifier, and large wear of the grinding roller and grinding disc

[0006] In the process of realizing the present invention, the inventor found that there are at least defects in the prior art such as unreasonable equipment structure, complicated operation process and high impurity content

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