Preparation method of high-purity calcium oxide

Abstract

The invention provides a preparation method of high-purity calcium oxide. Calcium hydroxide is produced by using raw materials with extremely high calcium oxide content, the dispersity of calcium ionsis improved by using stearic acid and polyvinyl alcohol 124, and the crystal form and the particle size of the calcium ions are controlled so that calcium hydroxide solids are high in fineness and good in dispersity, and finally, calcium oxide with high purity and good dispersity is prepared through high-temperature calcination. Calcium hydroxide with good dispersity can be better and more uniformly calcined at high temperature so that the production efficiency is improved, the yield of waste gas CO2 is reduced, and the cost of subsequent treatment is reduced. The method is simple in process,safe, environmentally friendly and high in production efficiency, and the prepared calcium oxide product is high in purity and good in dispersity.

Description

technical field

[0001] The invention belongs to the technical field of calcium oxide preparation, in particular to a preparation method of high-purity calcium oxide. Background technique

[0002] Calcium oxide is an inorganic compound, commonly known as quicklime, which can be used as a filler, analytical reagent, building material, decolorizer, etc. Usually, the method for preparing quicklime is direct calcination. The limestone is crushed and then calcined at a high temperature of 900~1200℃. Obtain finished product, but this method energy consumption is high, produces more carbon dioxide gas.

[0003] Invention patent CN201911208399.1, a preparation method of fine calcium oxide, including rough stone treatment, adding dilute hydrochloric acid to generate calcium chloride solution, filtering to remove impurities, adding sodium carbonate to generate calcium carbonate, constant temperature drying, calcination, cooling, surface treatment, crushing, Grinding and other steps to...

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