Air flotation treatment method for high-concentration salt-making brine

Abstract

The invention belongs to the field of salt preparation brine treatment, and particularly relates to a high-concentration salt preparation brine air floating treatment method. The method comprises four steps of 1, a water inlet and chemical adding stage; 2, a coagulation stage; 3, an air floating stage; 4, a slag scraping and defoaming stage. In the step 3, a microporous aerator is arranged in an air floating pool contact region; the pore diameter of the microporous aerator is smaller than or equal to 0.1mum; the aeration intensity is 1 to 3 Nm<3> / (m<2> / h); the water flowing speed in the aeration region is 5 to 9m / h; the contact time is 11 to 20min; after the air floating contact is completed, the materials enter an air floating separation region; the separation time is 40 to 75 min; after the upward floating of the floating slag, the floating slag is collected and enter a floating slag groove; the treated brine enters an air floating clean water region; the brine in the clean water region flows out through an overflowing opening and enters a water producing pool. The high-concentration salt preparation brine air floating treatment method has the advantages that the floating water producing particle diameter can be 1 to 1.5 mum; a great amount of colloid and suspension contaminants are effectively removed. The air floating treatment method is used, and the slat concentration of the salt preparation brine cannot be reduced.

Description

technical field [0001] The invention belongs to the field of salt-making brine treatment, in particular to an air flotation treatment method for high-concentration salt-making brine. Background technique [0002] There are rich chemical resources in brine, and the salt content is as high as 2-6 times that of seawater. The brine air flotation treatment can effectively remove impurities such as suspended solids and colloids in brine, reduce the chromaticity, and steam salt after producing water, which will greatly improve the product quality. Salt quality. [0003] The air flotation treatment method has a good separation effect on suspended solids that are difficult to settle naturally in the liquid phase, and has been widely used in water treatment in many industries. The air flotation treatment method is to form highly dispersed micro-bubbles in water, adhere to solid or liquid particles with hydrophobic groups in the water, and form a water-gas-particle three-phase mixed s...

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Problems solved by technology

[0007] At the same time, the process of pressurized dissolved air flotation and shallow air flotation involves many devices and pipe fittings, and the salt-making brine has a large salt content, which requires extremely high salt and corrosion resistance for water pumps and pipelines, so it is directly applied to the treatment of salt-making brine will increase the cost

However, the air flotation method of direct air distribution by traditional diffuser plates and diffuser tubes produces large bubbles and wastes a lot of energy consumption. Direct application cannot meet the processing requirements.

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