Apparatus and method for preparing high-activity calcium hydroxide by using carbide slag alkali residue

Abstract

The invention discloses an apparatus used for preparing high-activity calcium hydroxide by using carbide slag alkali residue. The apparatus comprises a sodium bicarbonate metrical adding apparatus, a carbide slag adding apparatus, and sequentially connected components of a mixing tank, a carbide slag delivering screw conveyor, a drier, a crusher, an air separator, a deduster, and a collection chamber. The sodium bicarbonate metrical adding apparatus and the carbide slag adding apparatus are both connected with the mixing tank. The invention also relates to a method used for preparing high-activity calcium hydroxide by using the carbide slag alkali residue. According to the invention, sodium bicarbonate and the carbide slag are stirred in the mixing tank; the mixture is processed by using the drier, the crusher, and the air separator; and a calcium hydroxide finished product can be collected by using the deduster. The apparatus and the method provided by the invention are advantaged inthat: an advanced micro-porous structure is formed in the calcium hydroxide particles, such that the specific surface area of calcium hydroxide is increased, and the reaction activity is improved. When calcium hydroxide is applied as a desulphurization absorbent, the desulphurization efficiency can be improved by 5-10%, such that the consumption amount of absorbent can be reduced, and the cost ofdesulphurization operation can be reduced.

Description

technical field [0001] The invention relates to a device and a method for preparing highly active slaked lime by utilizing calcium carbide slag alkali slag. Background technique [0002] There is a huge chlor-alkali industry in my country, which produces a large amount of calcium carbide waste alkali residue every year. According to the survey, the comprehensive utilization is not high, and the stacking takes up a lot of land. At the same time, it also causes secondary flying, which increases the fine particles in the atmospheric environment and seriously affects people's health. , On the other hand, as the alkali residue is flushed into the water system, the river is blocked, causing serious water pollution. At the same time, the main component of carbide slag is calcium hydroxide, which is a good desulfurizer. [0003] The developed method and device for preparing desulfurizer from carbide slag have the disadvantage that paste-like carbide slag or solid carbide slag partic...

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Problems solved by technology

[0004] The object of the present invention is to provide a device and method for preparing highly active slaked lime by using calcium carbide slag and alkali slag, which can effectively solve the problem of difficult crushing of carbide slag particles, high return ratio, high operating cost of powder making, and internal problems of the prepared slaked lime powder. Small pore structure, small specific surface area, and low activity as a desulfurizer

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