A kind of process of producing barium chloride with witherite as raw material

A technology of barium chloride and witherite, which is applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., which can solve complex process flow, high requirements for raw material witherite, and high energy consumption of barium chloride process problems, to achieve the effect of simple process, low cost and easy operation

Inactive Publication Date: 2016-08-17
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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Problems solved by technology

[0007] One of the purposes of the present invention is to provide a new type of witherite for the production of barium chloride by using witherite as raw material for the existing problems of high energy consumption, complicated process flow and high requirements for raw material witherite in the production of barium chloride. process of barium

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  • A kind of process of producing barium chloride with witherite as raw material

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Embodiment 1

[0040]Step 1: Mix the witherite containing 65% barium carbonate with water, grind it in an ore crusher to obtain ore slurry, wherein the ratio (mass ratio) of the witherite to water is 1:1, and the fineness of the ore powder is 80-100 mesh. The obtained pulp is evenly pumped into the reactor, and 30% hydrochloric acid is added, and the amount of hydrochloric acid is 1.1 times the theoretical acid hydrolysis amount (the pH value of the pulp is about 1.2-2). Heat the solution in the reactor to 65-70°C, react for 0.3-1.5 hours, and recover carbon dioxide gas. After no carbon dioxide is released in the reaction, the released carbon dioxide is purified and used to produce barium carbonate.

[0041] Step 2: Add milk of lime (the mass ratio of lime to water is 1:1) and a saturated sodium chloride solution at a temperature of 50-80°C to the raw material solution obtained in step 1. The amount of milk of lime is to adjust the raw material solution pH value to 8-9, the amount of satura...

Embodiment 2

[0049] Repeat the same steps as described in Example 1. Wherein, the witherite contains 69% by mass of barium carbonate, and finally through recrystallization, the total yield of barium chloride dihydrate crystals can reach more than 92%, and the purity can reach 99.95%.

[0050] The process uses witherite, hydrochloric acid and industrially refined salt as raw materials, and the crystallization method can be used to directly produce liquid low-strontium barium chloride, eliminating the need for high-temperature roasting, evaporation, thermal crystallization and other processes. The mother liquor and wash water are returned as bottom water after treatment, BaCl 2 The yield can be increased to 92.5%, and the mass concentration of strontium is 0.036g / L, that is, the mass fraction of strontium is 0.016%. The process is simple and easy, and compared with other processes, it has low cost and less investment.

[0051] Due to the similar chemical properties of Ba and Sr, it is diff...

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Abstract

The invention belongs to the technical field of chemistry, and concretely discloses a technology for producing barium chloride by taking witherite as a raw material. The technology comprises the following steps: mixing witherite and water, grinding and adding acid for acidolysis, adding salt and lime milk for removing impurity, falling film and pre-concentrating, evaporating and crystallizing to obtain barium chloride dehydrate crystals; cooling the crystal slurry and recrystallizing, recovering the barium chloride dehydrate crystals in a hot solution; merging the barium chloride dehydrate crystals and washing by saturated salt solution, recrystallizing and purifying, and drying to obtain the product barium chloride. The method has no restriction on witherite types, and raw material requirement is reduced, impurities removal step during the production process in a traditional mode is not required, flow is simple, operation is easy, no exhaust gas, waste residue and waste liquid is discharged during a whole process, and the technology accords with green chemical requirement, and the prepared barium chloride crystal has the advantages of high yield, high purity and low cost, and is suitable for large scale industrial production requirement.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a process for producing barium chloride by using witherite as a raw material. Background technique [0002] Barium chloride is an important inorganic chemical raw material and an important intermediate raw material for the preparation of barium salts and other materials. With the rapid development of the electronics and information industries and the recovery of the European economy, the demand for barium chloride is increasing in quality and quantity. increase. At present, the national annual output of barium chloride is about 100,000 tons, and the sales price of first-grade barium chloride is about 2,500 yuan / ton. And barium chloride has a wide range of uses, it can be used as analytical reagent, dehydrating agent, insecticide, purifying agent, mordant for printing and dyeing, matting agent for rayon, and can also be used as a solvent for high temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/24
Inventor 刘勇杨虎潘中才刘建容王学娟徐飞李伟罗家文
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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