Preparation method of barium hydroxide

Abstract

The invention discloses a preparing method of barium hydroxide, which comprises the following steps: (1) reducing barite into barium sulphide through coal; (2) immersing barium sulphide through washing water to obtain mother liquid of barium sulphide; adjusting the temperature of mother liquid of barium sulphide to 30-70 Deg C and density at 50-150g / L; washing filter slag through water; immersing barium sulphide through washing water; (3) oxidizing barium sulphide to produce barium hydroxide, sulfur and manganese monoxide through manganese dioxide; filtering to obtain barium hydroxide mother liquid; obtaining the filter slag with sulfur and manganese monoxide; (4) condensing barium hydroxide; crystallizing; centrifuging; separating to obtain barium hydroxide octahydrate; (5) separating filter slag in the step (3); recycling sulfur; oxidizing manganese monoxide into manganese dioxide through air to circulate in the step (3).

Description

(1) Technical field [0001] The invention relates to a preparation method of a barium compound, in particular to a preparation method of barium hydroxide. (two), background technology [0002] Barium hydroxide is a basic chemical raw material, used to manufacture barium salts, organic barium compounds, barium-based grease, and also used for refining animal and vegetable oils, sucrose, and sugar beets. Also used in plastic stabilizers, paper additives, sealing components, rubber vulcanization catalysts, antirust paper components, paint dispersants, polyurethane foam fire extinguishing agents, silk and rayon treatment agents, boiler hard water softeners and neutralizers, glass The enamel industry is used as a raw material for the production of glass and enamel. With the development of new uses for barium hydroxide, the market demand for barium hydroxide is increasing year by year. [0003] There are two traditional barium hydroxide industrial production processes: [0004] (1...

AI Technical Summary

Problems solved by technology

[0007] Disadvantages of this method: high production cost, only 70% raw material utilization rate, low resource utilization rate, difficult recovery of barium chloride, barium hydroxide, sodium chloride and sodium hydroxide contained in crystallization mother liquor

[0011] ①. The production cost is high, and the raw materials require good quality of witherite, but at present, high-quality witherite mineral resources are becoming increasingly exhausted, and the utilization rate of process raw materials is only 50%, and the utilization rate of resources is low;

[0012] ②. The high temperature reaction takes a long time and consumes a lot of energy. The high temperature reaction at 1400°C takes dozens of hours to complete

[0013] ③. The use cycle of the clip bowl containing the reaction materials is only 2 to 3 times, and the cost is high

[0015] (1), in actual production, the barium hydroxide described in its step (1) can't reach relevant national quality standard, promptly can't make qualified product

Its reason is: the obtained barium hydroxide contains the eutectic mixture of barium hydroxide and barium sulfide, all can't remove barium sulfide by washing, the method for recrystallization, thus the sulfur content is too high in the barium hydroxide product made

[0016] (2) Due to the above deficiencies, a large amount of raw materials are wasted in the production process