Drying method and drying device for porous calcium silicate material

Abstract

The invention provides a drying method and drying device for a porous calcium silicate material. The drying method comprises the following steps of 1), carrying out primary preheating on the porous calcium silicate material so as to obtain primary-grade dried porous calcium silicate, wherein the water content of the primary-stage dried porous calcium silicate is reduced by 10%-15% compared with the water content of the porous calcium silicate material; 2), carrying out secondary preheating on the primary-stage dried porous calcium silicate so as to obtain secondary-stage dried porous calcium silicate, wherein the water content of the secondary-stage dried porous calcium silicate is reduced by 80%-90% compared with the water content of the porous calcium silicate material; and 3), carryingout drying on the secondary-stage dried porous calcium silicate so as to obtain the porous calcium silicate product, wherein the water content of the porous calcium silicate product is lower than 5%.According to the drying method and drying device for the porous calcium silicate material, effective drying of the high-moisture porous calcium silicate material can be achieved, and the water contentin the dried porous calcium silicate product is lower than 5%.

Description

technical field [0001] The invention relates to a drying technology, in particular to a drying method and a drying device for a porous calcium silicate material, and belongs to the technical field of chemical industry. Background technique [0002] In the production process of alumina extraction by fly ash pre-desilicate soda lime sintering method, fly ash desiliconization is one of the key processes. At the same time, because there are almost as many silicon elements in fly ash as aluminum , Therefore, the fly ash after desiliconization not only improves the aluminum-silicon ratio to meet the needs of alumina production, but also forms a large amount of sodium silicate solution. Through the reaction of these sodium silicate solutions with milk of lime, a large amount of alkali is recovered and a new substance-porous calcium silicate is formed. [0003] Due to its special porous structure, it is difficult to use physical methods to reduce its moisture to a dry level, whethe...

AI Technical Summary

Problems solved by technology

[0004] Since this substance is a new type of material, there is insufficient market awareness, and there are few companies producing and researching it. Therefore, there is only one drying method that has been confirmed by production, that is, flash dryer plus rotary kiln dryer. Two-stage drying process. In this drying method, the flash dryer used as the first-stage drying often causes the equipment to fail to operate normally due to high moisture in the material. During the feeding process, the material effluent often turns into paste, and the production capacity is low. High consumption, resulting in long-term shutdown of drying equipment for porous calcium silicate materials, making it difficult to carry out normal production

Other single drying equipment, after many tests, also has low drying output and high energy consumption due to the high moisture content of the material, and it is difficult to effectively solve the drying problem of porous calcium silicate

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