Preparation method of high-purity barium carbonate

Abstract

The invention discloses a preparation method of high-purity barium carbonate. The preparation method comprises the following steps: (1) crushing barite into powder, carrying out alkali washing, acid washing and water washing, and finally carrying out drying to obtain barite powder; (2) adding the barite powder into a reactor, introducing nitrogen to replace air in the reactor, continuously introducing nitrogen, carrying out heating to 1000-2000 DEG C, then introducing a mixed gas of sulfur vapor and nitrogen into the reactor, carrying out reacting for a period of time, and carrying out coolingto room temperature to obtain crude barium sulfide; (3) dissolving the crude barium sulfide in deionized water, and then carrying out filtering to obtain a barium sulfide clear solution; and (4) under the condition of 0-100 DEG C and a stirring rotating speed of 0-1000 r / min, introducing CO2 gas into the barium sulfide clear solution or slowly adding a sodium carbonate solution to carry out a precipitation reaction to obtain the high-purity barium carbonate. The preparation method disclosed by the invention is high in raw material conversion rate and meets the green production idea, and purity of the prepared barium carbonate is higher than 99.5%.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a preparation method of high-purity barium carbonate. Background technique [0002] As an important inorganic industrial raw material, barium carbonate is widely used in coatings, ceramics, optical glass, electronic chemicals and other fields. The high-purity barium carbonate powder material has a wider range of applications, so the preparation method of high-purity barium carbonate is a research hotspot in recent years. [0003] At present, there are two main methods for preparing high-purity barium carbonate at home and abroad: one is liquid phase precipitation method, using high-purity soluble barium salt (BaCl 2 , Ba(NO 3 ) 2 etc.) carry out precipitation reaction with carbonate radical in aqueous solution, this method needs to consume a large amount of water, and produces a large amount of waste water, adopts BaCl simultaneously 2 The introduced chloride ions are not eas...

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Problems solved by technology

[0003] At present, there are two main methods for preparing high-purity barium carbonate at home and abroad: one is liquid phase precipitation method, using high-purity soluble barium salt (BaCl 2 , Ba(NO 3 ) 2 etc.) carry out precipitation reaction with carbonate radical in aqueous solution, this method needs to consume a large amount of water, and produces a large amount of waste water, adopts BaCl simultaneously 2 The introduced chloride ions are not easy to remove, and Ba(NO 3 ) 2 The prepared barium carbonate often deteriorates the electrical properties of PTC components; the other is the carbonization method in the solid-phase synthesis method, which uses the oxidation-reduction reaction of coal and barite at high temperature to generate barium sulfide, and then introduces it into the barium sulfide aqueous solution. Carbonate ions are used to prepare barium carbonate. In this method, because the raw coal and barite used in the preparation of barium sulfide are in solid phase, the coal and barite are not in sufficient contact during the reaction process, resulting in low raw material utilization, and the reaction tail gas contains A large amount of carbon dioxide and some unreacted carbon monoxide do not conform to the concept of green environmental protection

[0004] In summary, the use of existing technologies to prepare high-purity barium carbonate has problems such as low conversion rate of raw materials, failure of by-products to be utilized as resources, and environmental protection.

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