(1) Lake salt washing and dehydration process The original salt has a hard texture, large particle size, and an average particle size of 3.93 mm, which is easy to wash and dehydrate. The general adopted process is: hydraulic pipeline transportation → hydrocyclone → vibrating screen → cast stone tank scraper machine → vibration centrifuge washing dehydration regeneration salt texture soft, large particle size, average particle size is 1.84 mm, fragile, no Dehydration and recovery are difficult. Generally adopt: spiral graded salt washing machine → scraper classifier → piston centrifuge to wash and dewater; at the same time, the overflow liquid of each part can be collected and clarified to reduce the loss of powder salt.
(2) Process for removing calcium washing salt Calcium washing salt is a kind of lake salt product unique to China. It is the main impurity in the original lake salt - gypsum (CaSO 4 • 2H) by first roasting, then soaking and washing. 2 O) Substantially removed to reduce its content to within the limits allowed by national standards. The principle of the process is: when the ore is calcined to 200-260 ° C, the calcium sulfate dihydrate is dehydrated into calcium sulfate hemihydrate, and the calcined ore is placed in saturated brine to be soaked, and the calcium sulfate hemihydrate is used. It is dispersed into fine particles (particle size less than 0.08 mm), suspended on the surface of the brine, and then discharged through the overflow: the particles of the sodium salt are broken at this time, but most of the particle size is still above 1 mm, sinking at the bottom of the tank. After dehydration after discharge, the finished salt is obtained - calcium washing salt.
(3) Lake salt brine process for vacuum salt production The vacuum salt material used in the lake salt production plant (field) is the corner salt of the powder salt, salt cover and earthworm used in the production. Powder salts and gypsum-containing impurities such as salts of the corners, the cover contains more silt salt and magnesium chloride. The powder salt and the original salt salt cover may be mixed in a ratio of 2:1, and the powder salt and the regenerated salt salt cover may be mixed in a ratio of 4:1, and the above various raw materials may also be used separately. The process of using the lake salt to produce halogen in the vacuum salt production mainly includes three processes: a salt-salt process, a long-salt salt-salt process, and a spiral-mixed salt-salt process.

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