Ceramic grinding segment for cement grinder and preparation method of ceramic grinding segment

Abstract

The invention discloses a ceramic grinding segment for a cement grinder and a preparation method of the ceramic grinding segment. The ceramic grinding segment is prepared from the following components in percentage by weight: 92 to 95% of alumina, 0.5 to 2% of tungsten carbide, 0.8 to 3% of calcium carbonate, 1 to 1.2% of magnesium carbonate, 0.5 to 2% of titanium nitride, 1 to 3% of silicon dioxide, and 0.8 to 1% of zirconia, wherein the ceramic grinding segment for the cement grinder is in a shape of a cylinder, a spherical column combination, a spindle or a frustum of a square pyramid which is symmetrical up and down. The preparation method of the ceramic grinding segment is characterized by carrying out press forming and then high temperature sintering, and comprises the processes of material preparation, ball milling, spray granulation, silo aging, profiling, high temperature sintering, powder removing and polishing, drying of a finished product and the like. The density of the finished product is only half of a steel material, so as to be capable of effectively saving electricity and energy and reduce carbon emission. The finished product further has high hardness, good abrasion resistance, low material consumption, good economy, high temperature resistance, capability of working at high strength for a long time, good toughness, difficult breaking and collapse while being impacted, excellent practicality, good binding force and easier forming.

Description

technical field [0001] The invention relates to the field of cement processing, in particular to a ceramic grinding section for a cement grinder and a preparation method thereof. Background technique [0002] The main raw materials for making cement are limestone, clay and iron ore powder. In order to control the setting time, less than 4% gypsum should be added to the clinker. During the cement production process, most of the raw materials are crushed and then pre-homogenized. During the preparation of cement raw materials, at least 3 tons of materials (including various raw materials, fuels, clinker, mixtures, and gypsum) must be ground for each ton of Portland cement produced. According to statistics, the grinding operation of dry-process cement production lines requires The power consumed accounts for more than 60% of the power of the whole plant, of which raw material grinding accounts for more than 30% and cement grinding accounts for about 40%. [0003] The cement g...

AI Technical Summary

Problems solved by technology

The patent "A Method of Sintering Microcrystalline Alumina Toughened Ceramic Grinding Balls at Low Temperature" (application number: 201310109543.2, publication date: 2013-06-26) discloses a grinding body that also uses ceramics as raw materials. The patent A large number of kaolin and carbonate are used as sintering aids, and more silicon powder is used as a toughening agent. The high-strength ceramic component is only about 40%, and the hardness of the formed grinding body is relatively low, and the high temperature resistance is relatively high. Poor, the advantages of its invention tend to reduce the sintering temperature to improve production efficiency, while sacrificing part of the grinding performance. At the same time, the grinding body is only suitable for spherical shape, and it is difficult to withstand strong impact and grinding if it is processed into a ceramic segment; in addition, due to With the addition of a large amount of toughening and cooling additives, the strength is not enough. The optional forming diameter of the ceramic grinding ball can only be less than 10mm, which cannot meet the needs of large-scale ball mills.

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