High-moisture chalk vertical mill drying and grinding process

Abstract

The invention discloses a technology for baking and grinding high-moisture chalk through a vertical mill and belongs to the field of cement raw materials prepared by adopting high-moisture chalk raw materials. Clammy chalk with the moisture more than 25% is fed onto an inner refiner plate of the vertical mill from a feeding mouth of the vertical mill; hot wind passes through a wind chamber, a wind ring and a chamber above the refiner plate from a hot wind inlet and discharges out of the vertical mill from a hot wind outlet; zone control is performed on the moisture of materials inside the mill; the moisture of the materials is dried step by step; a powder selecting machine, the feeding mouth and the hot wind outlet are arranged at the upper part of the vertical mill; the refiner plate and mill grinding rollers are arranged inside the vertical mill; a cloth scraping plate is arranged above the refiner plate; a retaining ring is arranged at the edge of the refiner plate; the height of the retaining ring exceeds 150 mm; the wind chamber is arranged below the refiner plate; the wind chamber is communicated with the chamber above the refiner plate through the wind ring; the hot wind inlet of the mill, a material scraping device and a feeding back port are arranged in the wind chamber, the feeding back port is connected with the feeding mouth through an outer circulating system of the mill. The invention provides a simpler and energy-saving preparation technology and device for preparing the cement raw materials by adopting the high-moisture chalk raw materials.

Description

technical field [0001] The invention belongs to the field of preparing cement raw meal by using high-moisture chalk raw material. Background technique [0002] The preparation of cement raw meal by vertical mill is an energy-saving drying grinding process commonly used in the cement industry. However, subject to the design characteristics of traditional vertical mills, the comprehensive moisture of raw materials processed by traditional raw meal vertical mills is generally below 15%. [0003] Chalk is generally mined underground by excavators, the moisture content is generally 20%-35%, and the viscosity is high, so it is not feasible to use traditional raw meal vertical mills to prepare chalk raw meal with an initial moisture of 25-30%: [0004] 1. The drying and grinding process of the traditional vertical mill for raw materials cannot dry the chalk raw material with a moisture content of more than 25%; the sticky and wet chalk raw material cannot form a stable material be...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of moisture limitation and material bed stability of dry-grinding high-moisture chalk raw materials in the prior art, and provide a more concise and energy-saving preparation for the preparation of cement raw materials using high-moisture chalk raw materials Process and device

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