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Method for preparing low-sulfur barium carbonate and prepared barium carbonate product

A barium carbonate and product technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of high total sulfur content, achieve the effect of reducing total sulfur and preventing the production of sulfur

Active Publication Date: 2014-08-27
GUIZHOU REDSTAR DEVING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present inventor has carried out long-term and in-depth research on the preparation of barium carbonate total sulfur, combined with the physical and chemical conditions of polysulfides and sulfur, by controlling the carbonization end point, system pH value control and introduction of coordination elements, sulfur and the like will be formed into soluble substances, thereby Solved the problem of excessive total sulfur content

Method used

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  • Method for preparing low-sulfur barium carbonate and prepared barium carbonate product

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add NaOH to 120g / L BaS solution to make [Na + ] at about 0.01mol / L, control the temperature of the mixed solution to 70°C.

[0035] Put the above solution in a conventional three-tower carbonization tower, pass through lime kiln kiln gas for conventional carbonization, control the BaS concentration at the end of carbonization to 0.35g / L, and the pH value at the end point is 7.5, stop carbonization, centrifugal separation, and the filter cake enters the next step.

[0036] The above-mentioned filter cake was hot-washed twice at 1:4 ratio of material to water at 60°C for 1.5 hours, flash-dried to obtain low-sulfur barium carbonate sample 1 # .

Embodiment 2

[0038] Add NaCl in 120g / L BaS solution, make [Na + ] at about 0.02mol / L, control the temperature of the mixed solution to 80°C.

[0039] Put the above solution in a conventional three-tower carbonization tower, pass through lime kiln kiln gas for conventional carbonization, control the BaS concentration at the end of carbonization to 0.4g / L, and the pH value at the end point is 8.0, stop carbonization, centrifuge, and the filter cake enters the next step.

[0040] The above-mentioned filter cake was hot-washed twice at 1:4 ratio of material to water at 70°C for 1.5 hours, flash-dried to obtain low-sulfur barium carbonate sample 2 # .

Embodiment 3

[0042] Add KOH in 150g / L BaS solution, make [K + ] at about 0.015mol / L, control the temperature of the mixed solution to 65°C.

[0043] Put the above solution in a conventional three-tower carbonization tower, pass through lime kiln kiln gas for conventional carbonization, control the BaS concentration at the end of carbonization to 0.25g / L, and the pH value at the end point is 7.5, stop carbonization, centrifugal separation, and the filter cake enters the next step.

[0044] The above-mentioned filter cake was hot-washed twice at 1:4 ratio of material to water at 70°C for 1.5 hours, flash-dried to obtain low-sulfur barium carbonate sample 3 # .

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Abstract

The invention relates to a method for preparing low-sulfur barium carbonate and a prepared barium carbonate product. The method for preparing low-sulfur barium carbonate comprises the following steps: (1) ingredients: introducing sodium ion or potassium ion so that the sodium ion or potassium ion concentration is in the range of 0.01-0.25mol / L; (2) carbonizing: introducing a lime kiln gas to the mixed liquid obtained in the step (1) to carbonize, finishing the carbonization when BaS concentration is 0.25-0.4g / L, and separating the solid from the liquid; and (3) finished product processing: thermally washing the obtained solid phase in the step (2), and evaporating and drying to obtain low-sulfur barium carbonate. A certain amount of sodium ion or potassium ion is added in the BaS system so as to form a soluble sodium polysulfide or potassium polysulfide by the oxidized polyfulfide, the generation of the sulfur is prevented, and the total sulfur content of the barium carbonate product is reduced.

Description

technical field [0001] The invention relates to a method for preparing low-sulfur barium carbonate and the prepared barium carbonate product. Background technique [0002] Barium carbonate products are widely used in ceramics, glazes, electronic components and other industrial fields. Due to the influence of oxygen in the leaching process of barium sulfide clinker and carbon dioxide carbonization process in the traditional carbonization method, the sulfur element is oxidized to form polysulfides and sulfur is entrained into the barium carbonate product, resulting in an increase in the total sulfur of the barium carbonate product, affecting the use by downstream customers. Contents of the invention [0003] The present inventor has carried out long-term and in-depth research on the preparation of barium carbonate total sulfur, combined with the physical and chemical conditions of polysulfides and sulfur, by controlling the carbonization end point, system pH value control a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 姜志光华东刘湘玉
Owner GUIZHOU REDSTAR DEVING
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