Steel slag multistage crushing and grinding ultrafine powder preparation device and method

Abstract

The invention relates to a steel slag multistage crushing and grinding ultrafine powder preparation device and method. The device comprises: a steel slag tailing bin (1), a rod grinding slag breaker (2), a first belt line (3), an electromagnetic roller iron remover (4), a first magnetic separation powder bin (5), a double-roller slag breaker (6), a disc magnetic separator (7), a second magnetic separation powder bin (8), a second belt line (9), a vertical slag grinder (10), a powerful magnetic separator (11), a third magnetic separation powder bin (12), a bucket elevator (13), a hot blast stove (14), a dust collector (15) and a finished product warehouse (16). With the multistage crushing and magnetic separation treatment process, the granularity of the steel slag tailings and the contentof iron elements such as metallic iron in the steel slag tailings are gradually reduced, the grinding power consumption of the steel slag is greatly reduced, and the activity index of the steel slag ultrafine powder is remarkably improved; meanwhile, the recycling of iron resources is efficiently realized, and the resource utilization value of the steel slag is systematically improved.

Description

technical field [0001] The invention relates to a device and method for preparing superfine powder by multistage crushing and grinding of steel slag, in particular to a device and method for preparing superfine powder by performing multistage crushing, magnetic separation and grinding of steel slag tailings in iron and steel enterprises. Background technique [0002] About 0.12 to 0.14 tons of steel slag is produced for every ton of steel produced. In 2019, the production of steel slag in my country is about 130 million tons, and the utilization rate is 30%. A large amount of steel slag tailings cannot be utilized as resources. The annual increase in the amount of steel slag dumps exceeds 80 million tons, and the cumulative stockpiles exceed 1 billion tons, occupying a large amount of land, polluting water systems, soil and other environmental safety hazards. [0003] The main chemical components of steel slag are CaO, SiO 2 , FeO, Fe 2 o 3 and other oxides. Generally, t...

AI Technical Summary

Problems solved by technology

Since steel slag contains a large amount of iron elements, contains RO phase and olivine-like minerals with slow hydration, the content of tricalcium silicate in steel slag is relatively low, resulting in low activity index of steel slag cementitious material products

At the same time, due to the high hardness substances such as metallic iron in steel slag, the energy consumption of steel slag grinding is high

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