Method for preparing barium chloride by high-calcium witherite

Abstract

The invention discloses a method for preparing barium chloride by high-calcium witherite. The method comprises the following raw materials by weight: 100 KG of high-calcium witherite with a barium carbonate content of 40-55 percent and a calcium carbonate content of 25-30 percent, and high-concentration hydrochloric acid with a concentration of 32 percent. The method for preparing the barium chloride by the high-calcium witherite, disclosed by the invention, has the benefits that by utilizing a common-ion effect, the high-concentration hydrochloric acid is adopted for reaction; the high-concentration hydrochloric acid is adopted for reaction with ores, calcium chloride produced by the reaction is fully dissolved in water brought by the hydrochloric acid, only a very small amount of produced barium chloride is dissolved in the water, and most of produced barium chloride exist in barium slag in a solid form; through primary filtration, a filtered liquid is a calcium chloride liquid, thecalcium chloride is removed, and then filter residues enter beating barrel for beating with water; the barium chloride in the barium slag is completely leached out to obtain barium chloride liquid with high purity, and then the barium chloride liquid is used for evaporative crystallization, so that the obtained product is high in purity and high in yield, and the steam consumption and the power consumption per ton of products are low.

Description

technical field [0001] The invention relates to the field of barium chloride preparation, in particular to a method for preparing barium chloride from high-calcium witherite ore. Background technique [0002] Barium chloride is a white crystal, easily soluble in water, slightly soluble in hydrochloric acid and nitric acid, insoluble in ethanol and ether, easy to absorb moisture, needs to be sealed and stored, used as analytical reagent, dehydrating agent and barium salt, and used in electronics, Instrumentation and metallurgy industries, mainly used in metal heat treatment, barium salt manufacturing and electronic instruments, also used as heat treatment agent in mechanical processing, determination of sulfate and selenate, chromatographic analysis, spot analysis determination of platinum, water softener and fabric dyeing. [0003] For the production method of barium chloride proposed by Chinese patent CN105967216B, the method utilizes a ball mill to grind barium slag with ...

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention provides a method for producing barium chloride from high-calcium witherite ore, which has the advantage that high-calcium witherite ore can produce barium chloride in large quantities at low cost, and solves the problem of continuous production of barium chloride with the continuous increase in mining volume. Increasingly, high-quality ore reserves are becoming less and less, and witherite with low grade and calcium carbonate content greater than 25% is difficult to utilize