Method and device for refining brine by air floatation method

Abstract

The invention belongs to the technical field of brine purification, and particularly relates to a method and a device for refining brine by an air floatation method. The air flotation technology is used for refining brine, so that the production efficiency of salt manufacturing and salt chemical enterprises can be improved, the cost of salt products can be reduced, the quality of the salt productscan be improved, the application field of the salt products limited by the product quality is widened, and a foundation is laid for application of the air flotation technology in the brine purification field. The air floatation method brine refining device provided by the invention can separate insoluble substances which are as small as 0.05 micron in water, and the insoluble substances are usedfor refining brine, so that the separation effect is good.

Description

technical field [0001] The invention relates to the technical field of brine purification, in particular to a method and device for refining brine by air flotation. Background technique [0002] At present, in the brine purification and refining production process, the brine purification methods and means are generally different according to the different brine components. 2+ , Mg 2+ After the reaction of ionic impurities, large-grain solids, such as mud, sand and other insoluble solid impurities, are removed through a sedimentation tank or a settler; one is to remove large-grain solids, such as mud, through a sedimentation tank or a settler without adding any chemicals. , sand, etc., and then pass the brine containing suspended solids and high turbidity into a sand filter device or other filtering equipment to achieve the purpose of reducing water turbidity or purifying water quality and removing impurities; there is another kind of brine purification in the above two On ...

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Problems solved by technology

[0003] However, the sand filter device has a low removal rate of grease and colloid, and the decolorization effect is poor. It requires that the concentration of suspended solids in the influent water not be too high, otherwise it will cause excessive loss of water distributors in the device; sand filter The devices generally work in groups and in series, and occupy a large area. Due to its own structural requirements, it adopts the working method of backwashing, frequent flushing operations consume backwashing water, and the filter medium used needs to be replenished every year.

Other filtration equipment, such as bag filters, precision filters, etc., generally have certain requirements on the quality of solid impurities in the influent water, and the effect of reducing the turbidity of brine after filtration is not obvious

The use of membrane technology has higher requirements for membrane-fed brine. Saturated brine needs to be degreased and impurity-removed before entering the membrane to further refine brine. At the same time, considering the reasons of high investment and high daily maintenance costs, it is currently used in industrial salt and edible There are less applications in the field of salt

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