Technology for preparing barium sulfate by witherite

Abstract

The invention relates to a technology for preparing barium sulfate by witherite, which comprises the following steps: mixing the witherite with hydrochloric acid for reaction, adding alkali to cause heavy metal ions in the obtained solution to react with the alkali to generate precipitation of hydroxide, filtering and separating to remove insoluble impurities so as to obtain the solution containing Ba2+ and Ca2+, adding sulfuric acid in accordance with Ba2+ content in the solution to separate out all Ba2+ in the solution, and filtering separation to obtain barium sulfate; adding the sulphuric acid to the filtered liquid to separate out all Ca2+ in the solution, and carrying out filtering separation on the obtained solution and then mixing and reacting the solution with the witherite for applying to the preparation of the barium sulfate. The barium sulfate prepared by the technology has no energy consumption, can improve product quality, does not pollute environment, reduces consumption of the raw materials, and lowers the cost, thereby being capable of generating huge economic benefits.

Description

technical field [0001] The invention relates to a process for preparing barium sulfate, in particular to a process for preparing barium sulfate with witherite. Background technique [0002] At present, the preparation of barium sulfate generally adopts the Glauber's salt-black ash method, which is to mix barium sulfide with Glauber's salt solution and react at 90°C to form a barium sulfide precipitate. After the precipitate is filtered, washed with water and pickled, the pH is adjusted with sulfuric acid. When the value reaches 5-6, it is filtered, dried, and pulverized to obtain the precipitated barium sulfate product. [0003] Since the barium sulfide raw material used in the Glauber's salt-black ash method is obtained by converting barite, and the conversion process must be realized by adding a reducing agent at high temperature, generally the barite is mixed in a certain proportion for roasting and reduction, so that The method has high energy consumption, increases the...

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Problems solved by technology

[0003] Since the barium sulfide raw material used in the Glauber's salt-black ash method is obtained from the conversion of barite, and the conversion process must be realized by adding a reducing agent at high temperature, generally the barite is mixed in a certain proportion for roasting and reduction, so that This method has high energy consumption, increases the cost of producing barium sulfate, and the impurity content in the finished product is high due to roasting, and will cause serious environmental pollution at the same time

And other preparation methods of barium sulfate have no practical application value because of complex process and high cost

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