Method for purifying salt production mother liquor slurry by flue gas method

Abstract

The invention belongs to the technical field of salt production, and particularly relates to a method for purifying salt production mother liquor slurry by a flue gas method. The purification method comprises the following steps: conveying solid-liquid mixed mother liquor slurry containing salt and nitrate by a flue gas pipeline reactor, mixing the mother liquor slurry with unsaturated raw halogen, introducing pressurized flue gas, conducting circulating in a pipeline, simultaneously carrying out carbonization reaction, stopping circulating when the pH value is 8.5-9.0, carrying out gas-liquid separation, conducting filtering by an ultrafiltration membrane, recovering the filtrate into a vacuum salt production triple-effect evaporation tank for coproduction and salt and nitrate or for liquid salt preparation with a nanofiltration membrane; and pretreating filtered solid salt mud for application to flue gas purification, and subjecting purified flue gas to secondary purification by a water circulation compressor for application to mother liquor slurry purification. According to the method, the carbonization reaction is carried out while the mother liquor slurry is conveyed through the flue gas pipeline under pressure, the purification process is simplified, and the carbonization reaction rate is obviously increased; unsaturated raw brine is adopted, so that two alkalis in the mother liquor slurry are utilized, and solid salt and nitrate in the mother liquor slurry are dissolved; and the salty mud is pretreated and applied to flue gas purification, and foreign gas and smoke dust particles in flue gas are removed.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and waste resource utilization, and in particular relates to a method and application of flue gas method for purifying salt-making mother liquid slurry. Background technique [0002] With the sustainable development of my country's economic development and industrialization process, due to the increasing pressure on environmental protection, the country has higher and higher requirements for the discharge of solid waste, liquid waste, gas waste, effective use of resources, energy saving and consumption reduction, so the solution to solid waste , Reuse of resources, energy saving and consumption reduction are difficult problems to be solved in the salt industry. The main component of flue gas is N 2 , O 2 , CO 2 、H 2 O, its direct discharge into the atmosphere will have an impact on the environment. During the production process of the salt industry, a large amount of solid-liq...

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Problems solved by technology

The salt mud washing water consumption is too large, and the salt mud particle size is >60um. During wet desulfurization, slightly soluble calcium sulfate is easily formed on the surface of the salt mud particles, which inhibits the interaction with SO in the salt mud particles. 2 Contact, reduce the dissolution rate of salt mud, increase the tendency of scaling, thereby reducing the utilization rate of salt mud, and also affect the quality of terminal gypsum

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