Method for preparing barium sulfate and zinc sulfide

Abstract

The invention discloses a method for preparing barium sulfate and zinc sulphide, which takes barites and zinc containing ore as principal material and includes the following steps: firstly, black ash raw material which contains more than 50% of barium sulphide prepared by the mixed calcinations of barites and coal is leached to get pellucid barium sulphide solution; secondly, the barium sulphide solution reacts with mirabilite to get barium sulfate products after filter pressing separation, drying and grinding; thirdly, zinc oxide obtained by the calcinations of the zinc containing ore reacts with sulphuric acid, and zinc sulfate solution is prepared by the purification of reacting solution; fourthly, depurative zinc sulfate solution reacts with vulcanized alkali containing mother liquor which is prepared after the separation of the barium sulfate from the reacting resultant obtained from step two to get zinc sulphide after filter pressing separation; the sodium sulfate containing mother liquor which is separated from zinc sulphide is put into a boiler for concentration; the steam formed heats the leach barium sulfide water; the concentrated sodium sulfate containing solution reacts with barium sulfide to prepare precipitated barium sulfate.Due to the adoption of closed cycle, the invention has the advantages of simple operation, high yield, energy conservation and environmental protection.

Description

Technical field: [0001] The invention belongs to the technical field of chemical industry for preparing barium sulfate and zinc sulfide, in particular to a method for preparing barium sulfate and zinc sulfide. Background technique: [0002] At present, the existing barium sulfide solution and Glauber's salt solution are used to react the by-product containing alkali sulfide Na in the process of preparing precipitated barium sulfate. 2 The treatment method of S waste liquid is to heat all the water to evaporate, and process it into solid alkali sulfide product for sale, but on the one hand, it will consume a lot of coal heat energy, and at the same time, part of the product will be lost in the conversion from liquid phase to solid phase during the production process. And the selling price of soda sulfide product is low again, so it is uneconomical economically; on the other hand, the production process of sodium sulfide is simple, and sodium salt and sulfur-containing compoun...

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Problems solved by technology

[0002] At present, the existing barium sulfide solution and Glauber's salt solution are used to react the by-product containing alkali sulfide Na in the process of preparing precipitated barium sulfate. 2 The treatment method of S waste liquid is to heat all the water to evaporate, and process it into solid alkali sulfide product for sale, but on the one hand, it will consume a lot of coal heat energy, and at the same time, part of the product will be lost in the conversion from liquid phase to solid phase during the production process. And the selling price of soda sulfide product is low again, so it is uneconomical economically; on the other hand, the production process of sodium sulfide is simple, and sodium salt and sulfur-containing compound are more general, so cost is very low, and the product purity that above-mentioned preparation obtains is not high , contains some impurities, so the benefit is not good, and the utilization rate is low

The existing zinc sulfide is natural sphalerite, which is relatively rare and expensive, so it cannot be popularized

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