Production method for special strontium chloride for liquid crystal

Abstract

The invention relates to a production method for a special raw material of strontium chloride hexahydrate for a liquid crystal product. The production method comprises: adopting strontianite and hydrochloric acid as raw materials to obtain a mixed solution; condensing the mixed solution to 40-45 Baume degrees, then cooling the condensed solution to a temperature less than 10 DEG C to carry out crystallization; dissolving the crude strontium chloride in pure water, then adjusting the concentration of the strontium chloride solution to 40 Baume degrees, heating to the temperature more than 90 DEG C; adding an assistant material of strontium hydroxide according to a certain ratio to the heated solution; adjusting a pH value of the resulting solution to more than 12; continuously heating until the solution is boiled, then standing for 1-2 hours, carrying out pressure filtration; carrying out cooling and recrystallization; carrying out centrifugation, drying and packaging to obtain the finished product. According to the present invention, the performance indicators of the product are far higher than the industry standard; the produced product through the method provided by the present invention has stable product quality, significant fluctuate of the product quality can not be generated; with adopting the method provided by the present invention, the direct production cost is less than 5000 yuan per ton, and is reduced by more than 1000 yuan per ton compared to the direct production cost by adopting the industrial strontium carbonate as the raw material; the method has a good market promotion value.

Description

technical field [0001] The invention relates to a production method of strontium chloride hexahydrate, in particular to a production method of a special strontium chloride hexahydrate raw material used in the production of liquid crystal glass substrates and the like. Background technique [0002] The industry standard requirements for special strontium chloride used in the production of liquid crystal products are as follows: [0003] SrCl 2 ·6H 2 O>>99.5%; [0004] Ba<<0.05%; [0005] Ca<<0.05%; [0006] Na<<0.02%; [0007] Fe<<0.0005%; [0008] Mg<<0.0002%; [0009] SO 4 <<0.005%; [0010] And the product is loose and does not agglomerate. [0011] At present, industrial strontium carbonate is used as raw material to produce strontium chloride for liquid crystal at home and abroad. Specifically, strontium carbonate and hydrochloric acid are used to react to obtain strontium chloride solution, which is treated with sulfur...

AI Technical Summary

Problems solved by technology

[0013] 1. The cost is high. Due to the high price of industrial strontium carbonate raw materials and the average content of barium carbonate in industrial strontium carbonate is about 1.5%, it is necessary to remove barium. When removing barium, a large amount of strontium will be precipitated at the same time, and the consumption of strontium carbonate is relatively high. , generally up to 0.8 tons of product consumption (theoretical consumption is 0.6 tons), which further increases the cost, and the direct production cost of strontium chloride produced by this method is more than 6000 yuan / ton

[0014] 2: Since the barium content control index of strontium chloride products for liquid crystals is very strict (barium content is required to be less than 0.05%, and magnesium content is less than 0.0002%), and the barium removal process is currently immature, resulting in unstable product quality, which will affect the follow-up liquid crystal Product production caused great instability

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