Water-saving preparation device for washing basic magnesium carbonate in grading circulation mode

Abstract

The invention discloses a water-saving preparation device for washing basic magnesium carbonate in a grading circulation mode. The water-saving preparation device comprises a reaction tank, a primary washing disc and a mother liquor tank which are sequentially connected through a pipeline, and further comprises a secondary mother liquor tank, and a liquid inlet of the secondary mother liquor tank is communicated with a liquid outlet of the primary washing disc through a pipeline; and the liquid outlet of the secondary mother liquid tank is communicated with a flushing opening of the reaction tank. Pyrolysis water is used as washing water for primary washing after basic magnesium carbonate mother liquor is separated for washing, and secondary mother liquor is recycled for washing residual materials in the reaction tank, so that residual mother liquor ammonium sulfate in basic magnesium carbonate is greatly reduced, and the recovery rate of mother liquor magnesium sulfate is increased; and in the production cycle process, mother liquor ammonium sulfate is increased, raw material sulfuric acid supplementation amount is reduced, and raw material cost is reduced. A secondary mother liquor flushing tank is used for replacing deionized water for flushing the basic magnesium carbonate residual material to replenish the mother liquor, so that the mother liquor concentration is improved, and pyrolysis consumed in the reaction of the first procedure is saved favourably.

Description

technical field [0001] The invention relates to an inorganic salt preparation technology, in particular to a water-saving preparation device for graded and circular washing basic magnesium carbonate. Background technique [0002] As known, the bittern-soda ash method is the mainstream method for preparing basic magnesium carbonate. The method uses bittern, bittern and soda ash as raw materials, adds bittern or bittern in a reaction tank, and then adds soda ash under constant stirring. After the reaction is completed, carry out vacuum suction filtration, centrifugal dehydration, drying, crushing and sieving to obtain the finished product. [0003] For example, the authorized announcement number is CN100333999C, the authorized announcement date is August 29, 2007, and the invention patent titled "A Clean Production Preparation Method for Medicinal Basic Magnesium Carbonate" adds bittern to the reactor, and Heat the bittern to 50-80°C, slowly add condensate under stirring, and...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the prior art is that the reaction tank for the preparation of basic magnesium carbonate needs to be washed with a large amount of deionized water in the middle and later stages of preparation, and the water consumption is too large

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