Method for treating carbonic acid method sugarhouse filter mud by using boiler flue gas

Abstract

The invention discloses a method for treating carbonic acid method sugarhouse filter mud by using boiler flue gas. The method comprises the steps of mixing carbonic acid method sugar refining filter mud with water according to a mass ratio of 1:(0.1-1):10; then introducing boiler flue gas, controlling the pressure of the boiler flue gas to be 0.01-0.10Mpa, and controlling the pH value of the mixture to be 5.0-7.5; performing sedimentation for demixing to obtain a solution on the upper layer, and performing burning treatment to obtain solid particles on the lower layer; filtering and then embedding the solid particles or using the solid particles as a building material. According to the method disclosed by the invention, CO2 in the boiler flue gas is used to ensure that calcium carbonate is generated into calcium bicarbonate, organic impurities adsorbed by the calcium carbonate are released, organic substances are enriched in water, and solid-liquid separation facilitates resource utilization; the organic substances are dried through the flue gas and then are burnt, so that pollution can be thoroughly solved while increasing fuels; the CO2 and heat energy in the flue gas are fully used to protect the ecological environment.

Description

technical field

[0001] The invention relates to a method for treating filter mud of carbonic acid sugar factory, in particular to a method for treating filter mud of carbonic acid sugar factory by using boiler flue gas, which belongs to the treatment and comprehensive utilization of carbonic sugar filter mud in the field of environmental protection technology. Background technique

[0002] At present, most beet sugar factories and some cane sugar factories in the world use carbonation process to produce white granulated sugar. The advantage of this process is that the white sugar produced has high purity, low color value and storage resistance, which is significantly better than the sulfurous acid process commonly used in cane sugar factories. But it has a big disadvantage, that is, it produces a large amount of alkaline (8.0<pH<11) solid waste-filter mud (the ratio of wet filter mud to raw material is about 5-10%), and the main component of its dry solids is Has CaC...

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