Preparation method for barium carbonate

Abstract

A disclosed preparation method for barium carbonate comprises: at room temperature, dissolving barium hydroxide in a reaction vessel I with high-purity water under stirring, also at a certain temperature, adding a dispersant into the barium hydroxide solution, stirring at a constant temperature, heating ammonium carbonate in a reaction vessel II, introducing generated CO2 and NH3 into the reaction vessel I, reacting with stirring with a stirrer at a certain temperature, and performing filtering, leaching and roasting on the material finishing the reaction so as to obtain barium carbonate. According to the preparation method, by employing barium hydroxide and ammonium carbonate as the raw materials and employing a gas-liquid reaction, the reaction product is single; also, by adding the dispersant before the reaction starts and performing roasting at different periods and different temperatures, the agglomeration problem of precipitation is solved, the digestion time of precipitation is fully shortened and the purity of the product is guaranteed.

Description

technical field [0001] The invention relates to the technical field of design materials, in particular to a method for preparing barium carbonate. Background technique [0002] At present, the production methods of barium carbonate mainly include: carbonization method, double decomposition method and witherite method. Among them: the carbonization method has the advantages of simple production process and low cost, but its product has a high sulfur content; the main raw material of the double decomposition method is barium chloride, and the product cost is slightly higher, but the obtained product has a very low sulfur content and high purity; The witherite method has the characteristics of low investment, full utilization of raw materials, no pollution, and easy control of process conditions. However, it is difficult to remove impurities in the production process of this method, and the product purity is generally low. Comparing the three methods, the metathesis method can...

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Problems solved by technology

Among them: the carbonization method has the advantages of simple production process and low cost, but its product has a high sulfur content; the main raw material of the double decomposition method is barium chloride, and the product cost is slightly higher, but the obtained product has a very low sulfur content and high purity; The witherite method has the characteristics of less investment, full utilization of raw materials, no pollution, and easy control of process conditions, but it is difficult to remove impurities in the production process of this method, and the product purity is generally low

Comparing the three methods, the metathesis method can obtain relatively high-purity products, but the barium carbonate obtained by the metathesis method has poor consistency and poor crystal form, and there are a lot of chloride radicals in the product, and it is difficult to remove the chloride radicals