A method of grinding steel slag powder and mine slag powder and producing steel and iron slag powder by a vertical grinding mill

Abstract

A method of grinding steel slag powder and mine slag powder and producing steel and iron slag powder by a vertical grinding mill is disclosed. The method is characterized in that: the same vertical grinding mill is adopted to separately grind the steel slag powder and the mine slag powder; the grinding of the steel slag powder by the vertical grinding mill includes steps of grinding the steel slag powder by the vertical grinding mill and performing material-returning closed-loop circulation of the steel slag powder by the vertical grinding mill; the grinding of the mine slag powder by the vertical grinding mill includes steps of pretreating mine slag to remove metals, grinding the mine slag powder by the vertical grinding mill and performing material-returning closed-loop circulation of the mine slag powder by the vertical grinding mill; and the steel slag powder and the mine slag powder which are prepared by the vertical grinding mill and are qualified are respectively weighted by a corresponding seal constant weight feeder, fed into a rolling type material mixer and fully mixed, thus achieving a process of producing the steel and iron slag powder. The yield of the steel slag powder reaches 45 t / h. The yield of the mine slag powder reaches 60 t / h. The specific surface area of the steel slag powder is larger than 460 m<2> / kg, and the specific surface area of the mine slag powder is larger than 430 m<2> / kg, thus meeting the national standards. The single-machine product power consumption of the steel slag powder is 30 kwh per ton, and the single-machine product power consumption of the mine slag powder is 28 kwh per ton.

Description

technical field [0001] The invention relates to a method for grinding steel slag powder and slag powder by a vertical mill and producing steel slag powder, belonging to the field of comprehensive utilization of industrial solid waste. Background technique [0002] my country is a big country in steel production, accounting for nearly 50% of the world's total, so it is also a big country in steel slag production. The annual production of steel slag is nearly 93 million tons, and slag is more than 220 million tons. Slag Utilization Since 1999, except for large iron and steel enterprises that first introduced imported equipment and production lines, there are also hundreds of domestic vertical mill grinding slag powder production lines; the utilization rate is 78% of 172 million tons. The utilization of steel slag is lagging behind in technology, magnetic separation, pre-grinding equipment research and development and policies. The utilization amount is 20.46 million tons, and...

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Problems solved by technology

[0005] At present, the domestic steel slag processing and recycling metal grinding technology and utilization rate are far behind developed countries, mainly reflected in the fact that only a single steel slag can be processed, the magnetic separation and iron removal technology and equipment are backward, and the iron content in tailings > 3% cannot be ground. , can only be used or stockpiled at low value. If imported equipment is used for processing and grinding, the investment is large and it is difficult to promote. There are also many manufacturers who use ball mills to grind steel slag powder, which has low grade, high energy consumption and large losses.

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