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Preparation method of high-purity antimony trioxide

An antimony trioxide, high-purity technology, applied in chemical instruments and methods, antimony oxide/antimony hydroxide/antimony oxyacid, inorganic chemistry, etc., can solve problems such as weak impurity removal ability

Pending Publication Date: 2021-12-03
苏州飞斯达化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purification process of antimony trioxide in the prior art is to dissolve in acid and then dissolve in alkali. This method has weak impurity removal ability for some substances that are easily soluble in acid and difficult to dissolve in alkali.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] The invention provides a method for preparing high-purity antimony trioxide, comprising the following steps:

[0027] S1. Dissolution: place antimony trioxide in a container containing sodium hydroxide solution, adjust the pH value to 9, and perform the first stirring to dissolve;

[0028] S2. Filtration: filter the undissolved impurities in the container with a filter for the first time, then add carbonic acid solution into the container, and adjust the pH value to 6;

[0029] S3. Stirring: then stir the container for the second time, and continue to stir until the precipitate is precipitated, and ensure that the precipitation is complete;

[0030] S4, filter and dry: filter the precipitated antimony trioxide for a second time, then dry, then add distilled water, repeat filter and dry four times, and obtain a dry precipitate;

[0031] S5. High-temperature smelting: put the sediment in a smelting furnace, raise the temperature of the furnace to 700 degrees Celsius unti...

Embodiment 2

[0042] The invention provides a method for preparing high-purity antimony trioxide, comprising the following steps:

[0043] S1. Dissolution: place antimony trioxide in a container containing sodium hydroxide solution, adjust the pH value to 10, and perform the first stirring to dissolve;

[0044] S2. Filtration: Filter the undissolved impurities in the container with a filter for the first time, then add carbonic acid solution into the container, and adjust the pH value to 6.5;

[0045] S3. Stirring: then stir the container for the second time, and continue to stir until the precipitate is precipitated, and ensure that the precipitation is complete;

[0046] S4, filter and dry: filter the precipitated antimony trioxide for a second time, then dry, then add distilled water, repeat filter and dry four times, and obtain a dry precipitate;

[0047] S5. High-temperature smelting: put the sediment in a smelting furnace, raise the temperature of the furnace to 750 degrees Celsius u...

Embodiment 3

[0058] The invention provides a method for preparing high-purity antimony trioxide, comprising the following steps:

[0059] S1. Dissolution: place antimony trioxide in a container containing sodium hydroxide solution, adjust the pH value to 9.5, and perform the first stirring to dissolve;

[0060] S2. Filtration: filter the undissolved impurities in the container with a filter for the first time, then add carbonic acid solution into the container, and adjust the pH value to 6.25;

[0061] S3. Stirring: then stir the container for the second time, and continue to stir until the precipitate is precipitated, and ensure that the precipitation is complete;

[0062] S4, filter and dry: filter the precipitated antimony trioxide for a second time, then dry, then add distilled water, repeat filter and dry three times, and obtain a dry precipitate;

[0063] S5. High-temperature smelting: put the sediment in a smelting furnace, raise the temperature of the furnace to 725 degrees Celsiu...

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Abstract

The invention discloses a preparation method of high-purity antimony trioxide, which comprises the following steps: S1, dissolving: placing antimony trioxide in a container containing a sodium hydroxide solution, adjusting the pH value to 9-10, and stirring and dissolving for the first time; s2, filtering: filtering undissolved impurities in the container for the first time by using a filter screen, then adding a carbonic acid solution into the container, and adjusting the pH value to 6-6.5; s3, stirring: stirring the container for the second time, continuously stirring until the precipitate is separated out, and ensuring that the precipitate is completely separated out; s4, filtering and drying: filtering the separated antimony trioxide for the second time, then drying, then adding distilled water, and repeatedly filtering and drying for three to four times to obtain a dried precipitate; and S5, high-temperature smelting is conducted, specifically, the sediment is placed in a smelting furnace. The preparation method of the high-purity antimony trioxide not only can treat substances which are insoluble in alkali and easily soluble in acid, but also can assist in removing impurities from other substances.

Description

technical field [0001] The invention belongs to the technical field of preparation and processing of antimony trioxide, and in particular relates to a preparation method of high-purity antimony trioxide. Background technique [0002] Antimony trioxide is white powder, insoluble in water, soluble in sodium hydroxide solution and acid. Used in white pigments, paints and plastics, it acts as a pigment and flame retardant. [0003] The Chinese patent document discloses a preparation method of high-purity antimony trioxide (application publication number CN102020313A), which includes antimony trichloride rectification, hydrolysis, ammonolysis, washing and other steps to obtain high-purity antimony trioxide. The invention has simple process steps, high production efficiency and low cost. The antimony trioxide obtained by the method has high purity and low impurity content, and can meet the urgent needs of the current market. [0004] The Chinese patent document discloses a prepa...

Claims

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Application Information

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IPC IPC(8): C01G30/00
CPCC01G30/005
Inventor 龚烨
Owner 苏州飞斯达化工有限公司
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