Production method for grinding steel-iron slag powder, mineral slag powder and steel slag powder by using vertical mill

Abstract

The invention relates to a production method for grinding steel-iron slag powder, mineral slag powder and steel slag powder by using a vertical mill. The innovation points comprise that the same vertical mill is employed for independently grinding steel-iron slag powder, mineral slag powder and steel slag powder, steel slag tailings obtained in the steel-slag processing and metal recovery processing step and mineral slag obtained in the mineral-slag metal-removal pretreatment step are sent into the vertical mill according to the ratio of 2-4:8-6, and then a step of using the vertical mill to grind steel and iron slag powder and a step of performing magnetic separation on a recycled material of the vertical-mill ground steel and iron slag powder to remove iron and performing closed cycling are executed, so that the technology of using the vertical mill to grind steel and iron slag powder is realized. The method helps to simplify conventional production steps of steel and iron slag powder, improve the uniformity of the steel and iron slag powder and reduce production energy consumption and cost. The production method is capable of realizing sharing of most of equipment while realizing recovery and reutilization of resource by using the same vertical mill to respectively grind steel and iron slag powder, mineral powder and steel slag powder, so that the utilization rate of equipment and resource are substantially improved, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to a production method for grinding iron and steel slag powder, slag powder and steel slag powder by a vertical mill. 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, in addition to the introduction of imported equipment and production lines by large iron and steel enterprises, 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 annual utilization is 20.46 million tons, and the utilization rate is 22%. [0003] my country formulated steel...

AI Technical Summary

Problems solved by technology

[0007] To mix slag and steel slag tailings in proportion and then enter the vertical mill to grind directly to produce steel slag powder, the first thing to solve is that the iron content and hardness of these two slags are different, and the difference between hot stuffy slag and hot splashing slag Factors such as different activity will affect a series of issues such as vertical mill efficiency, output, quality and energy consumption.

The research found that even if the iron content in the slag is controlled to be about 0.2% through pre-treatment, and the iron content in the steel slag tailings is less than 1.5%, after the two slags enter the vertical mill together in proportion, the iron in the slag is easy to separate, and the tailings The iron in the slag is not easy to separate, and the return material enters the vertical mill with iron-containing tailings, causing the iron content of the mixed slag in the vertical mill to be more than 2%, which affects the grinding efficiency, output and energy consumption of the vertical mill

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