Process for preparing superfine high-activity metakaolin by utilizing vertical high-pressure mill

Abstract

The invention relates to a process for preparing superfine high-activity metakaolin by utilizing a vertical high-pressure mill, which is characterized by comprising the following steps of: firstly, crushing crude ore of metakaolin into 325+ / -30 meshes, grinding the crushed crude ore by the vertical high-pressure mill to obtain a superfine high-activity metakaolin powdery material with a particle size of 2-2.5mum, then conveying the superfine metakaolin to a rotary kiln feeding system by a fan, adding the superfine metakaolin into a rotary kiln by an automatic feeding machine, then carrying out high-temperature calcining on the superfine metakaolin in the rotary kiln with the temperature of 600-900 DEG C and the calcining time of 1-4 h, and preparing a superfine metakaolin product. The process has the advantages that the production cost is greatly reduced, the occupied area is only 50% of that of a ball mill system, the production efficiency is high, the energy is saved, the environment is protected, the granularity of a product is fine and uniform, the particle size of the product is 2.1-3.0mum, the minimum particle size can be controlled to be 2mum, and the uniformity is over 90%.

Description

technical field [0001] The invention relates to a process for preparing superfine high-activity metakaolin by using a vertical high-pressure mill, and belongs to the field of metakaolin preparation technology. Background technique [0002] At present, the domestic production process of calcined kaolin products from coal series is generally recommended by many materials as: raw ore, coarse crushing, ultrafine, crushing, grading, calcining, depolymerization, breaking up, and product packaging. Vertical high-pressure mill is an ideal large-scale grinding equipment, widely used in cement, electric power, metallurgy, chemical industry, non-metallic minerals and other industries. It integrates crushing, drying, grinding, grading and conveying, and has high production efficiency. It can grind block, granular and powder raw materials into required powder materials. [0003] At present, metakaolin is generally prepared by calcination processes such as tunnel kiln and muffle furnace....

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation process of metakaolin is generally made of tunnel kiln, muffle furnace and other calcination processes. This process has the advantages of low production efficiency, small production volume, and high energy consumption.