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Method for producing barium sulfate

A production method and barium sulfate technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve problems affecting product quality, etc., and achieve the effects of high comprehensive utilization of resources, good economic benefits, and convenient operation

Inactive Publication Date: 2009-07-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the fast reaction speed between barium sulfide and sodium sulfate, the precipitated barium sulfate has a wide particle size distribution range, and impurities such as sodium sulfate and sodium sulfide are easily wrapped in the obtained precipitated barium sulfate, which affects product quality.

Method used

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  • Method for producing barium sulfate
  • Method for producing barium sulfate
  • Method for producing barium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 100g of industrial barium carbonate, add 120mL of water to slurry with strong stirring for 2 hours, add 100g of anhydrous sodium sulfate at 60°C and stir for 2 hours, filter, and add the filter cake to dilute sulfuric acid with a pH value of 0.5 at a solid-to-liquid ratio of 1:2 In the solution, stir and wash at 80°C for 0.5h, then filter, wash, and dry to obtain precipitated barium sulfate with a purity of 98.3%. Washing water and barium carbonate transformation solution are mixed and stirred, and sulfuric acid is added to adjust the pH value to 6.6 to convert it into a mixed solution of sodium sulfate and sodium bisulfate, which is used as a barium carbonate slurry transformation solution, and the released CO 2 It is used as raw material for the production of barium carbonate.

Embodiment 2

[0044] The mixed solution of sodium sulfate and sodium bisulfate obtained in Example 1 was added to 100 g of barium carbonate powder ground to minus 120 mesh, stirred at 30°C for 6 hours, filtered, and the filter cake was added with sulfuric acid at a solid-to-liquid ratio of 1:3 to a concentration of 10 wt. % aqueous solution at 50°C for 1 h, then filtered, washed, and dried to obtain precipitated barium sulfate with a purity of 98.5%. Add appropriate amount of water to the washing water so that the concentration of sulfuric acid is 8% for standby; after transformation, the liquid is fed into CO 2 Adjust the pH value to 8.0, and keep it at 15°C for 1.5 hours to crystallize and precipitate NaHCO 3 , filter, and pyrolyze NaHCO at 240°C 3 Sodium carbonate is obtained; the crystallization mother liquor is used as the next batch of barium carbonate slurry.

Embodiment 3

[0046] Weigh 100g of industrial barium carbonate, stir it into 120mL of water for 2 hours, add 120g of anhydrous potassium sulfate at 50°C, stir for 4 hours, filter, add the filter cake to the washing water prepared in Example 2 according to the solid-to-liquid ratio of 1:4 Stir and wash at 35°C for 2.5 hours, then filter, wash, and dry to obtain precipitated barium sulfate with a purity of 98.4%. Washing water and barium carbonate transformed solution are mixed and stirred, and sulfuric acid is added to adjust the pH value to 6.8 to convert it into a mixed solution of potassium sulfate, potassium bisulfate, sodium sulfate, and sodium bisulfate, which is used as the slurry transformation liquid of barium carbonate, and the emitted CO 2 It is used as raw material for the production of barium carbonate.

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Abstract

The invention provides a method for producing permanent white which comprises four steps of pulpifying, transforming, washing and recycling comprehensively: firstly, adding barium carbonate into water to be pulpified; secondly, adding soluble sulphate to be transformed to permanent white; obtaining the qualified sediment permanent white product after being washed by dilute sulphuric acid, stirring the liquid after transformation, adding sulphuric acid so that the mixture is transferred to be soluble sulphate, returning to the pulpifying process to be recycled, taking CO2 generated in the reaction as the raw material for producing barium carbonate; or introducing CO2 gas to the transferred liquid to be crystallized so as to seed out supercarbonate and returning the mother liquid to the pulpifying process to be recycled. The method has simple technique and convenient operation, does not generate waste water or waste slag in the whole technique process, protects the environment, and has high comprehensive utilization rate of resources.

Description

technical field [0001] The invention relates to a production method of barium sulfate. Background technique [0002] Barium sulfate is an important chemical raw material. It is widely used in paints, pigments, coatings, inks, batteries, paper, plastics, rubber, ceramics, enamel, spices and other industries. The traditional process for producing barium sulfate includes the reaction of barium carbonate with sulfuric acid, the reaction of barium chloride with sulfuric acid or sodium sulfate, and the reaction of barium sulfide with sodium sulfate. Among them, the processing cost of producing barium sulfate by reacting barium sulfide and sodium sulfate is the lowest. In industrial production, barite is generally used as raw material, and barium sulfide solution is obtained by adding carbon reducing water, and then sodium sulfate solution is added to the barium sulfide solution to precipitate barium sulfate. But because barium sulfide and sodium sulfate react quickly, the bariu...

Claims

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Application Information

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IPC IPC(8): C01F11/46
Inventor 王学文王明玉肖利冯大伟
Owner CENT SOUTH UNIV
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