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Preparation method of sodium pyroantimonate

A technology of sodium pyroantimonate and antimony white, applied in the direction of antimonate/antimonite, etc., can solve the problems of incomplete reaction, difficult to control the amount of oxidant, complex working conditions, etc., and achieve high antimony recovery rate and product yield High efficiency, good metering convenience, and high-efficiency conversion effects

Pending Publication Date: 2022-07-22
YIYANG SHENGLI CHEM IND
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a preparation method of sodium pyroantimonate, which is used to solve the problems in the current production process of sodium pyroantimonate, such as incomplete reaction, low yield, difficulty in controlling the amount of oxidant, complicated working conditions, and unqualified product performance. question

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  • Preparation method of sodium pyroantimonate
  • Preparation method of sodium pyroantimonate
  • Preparation method of sodium pyroantimonate

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Embodiment 1

[0031] The sodium pyroantimonate of the present embodiment is prepared by using antimony white as a raw material, and the main chemical reactions involved in the preparation process include:

[0032] Sb 2 O 3 +2NaOH+2H 2 O 2 +3H 2 O=2NaSb(OH) 6 ↓ (1);

[0033] Sb 2 O 3 +2NaOH+3H 2 O=2NaSb(OH) 4 (2);

[0034] NaSb(OH) 4 +H 2 O 2 =NaSb(OH) 6 ↓ (3);

[0035] Reaction (1) is a molecular compound process, and antimony white directly reacts with hydrogen peroxide, hydrogen peroxide and water to generate sodium pyroantimonate according to the atom-economical reaction, which involves oxidation of antimony white and reduction of hydrogen peroxide; reactions (2) and (3) are as follows: Ionic compounding process: Antimony white dissolves in a high concentration of sodium hydroxide solution to form soluble sodium antimonite, which is then oxidized by hydrogen peroxide to form sodium pyroantimonate precipitation, which involves the redox effect of sodium antimonite ion and ...

Embodiment 2

[0043] The sodium pyroantimonate of the present embodiment is prepared from high arsenic antimony oxide powder as raw material, and the main chemical reactions involved in the preparation process include:

[0044] Sb 2 O 3 +2NaOH+2H 2 O 2 +3H 2 O=2NaSb(OH) 6 ↓;

[0045] Sb 2 O 3 +2NaOH+3H 2 O=2NaSb(OH) 4 ;

[0046] NaSb(OH) 4 +H 2 O 2 =NaSb(OH) 6 ↓;

[0047] As 2 O 3 +6NaOH+2H 2 O 2 =2Na 3 AsO 4 +5H 2 O;

[0048] As 2 O 3 +6NaOH=2Na 3 AsO 3 +3H 2 O;

[0049] Na 3 AsO 3 +H 2 O 2 =Na 3 AsO 4 +H 2 O;

[0050] Specifically include the following steps:

[0051] (1) in the reactor, add 400mL of distilled water, then add 100g of high arsenic antimony oxide powder, add sodium hydroxide, and make the sodium hydroxide solubility reach 9mol / L to obtain a mixed system;

[0052] (2) After turning on stirring and warming up to 80°C of the temperature of the mixing system in the kettle, the hydrogen peroxide was fed in at a flow rate of 5L / min, and the O...

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Abstract

The invention discloses a preparation method of sodium pyroantimonate, which comprises the following steps: (1) adding a sodium hydroxide solution into an antimony-containing material to obtain a mixed system; and (2) continuously introducing hydrogen peroxide into the mixed system, measuring the real-time potential of the mixed system, stopping introducing the hydrogen peroxide when the potential of the mixed system reaches a preset value, reacting for a set time, and performing post-treatment to obtain the sodium pyroantimonate. According to the method disclosed by the invention, the Sb (III) is completely oxidized into the sodium pyroantimonate product by controlling the mixed potential of the solution, so that the method has extremely high antimony recovery rate and product yield; meanwhile, the accurate oxidant adding amount can be well achieved in the potential-controlled oxidation process, metering convenience is good, and efficient conversion of antimony and separation of antimony from impurities such as sodium arsenate can be achieved.

Description

technical field [0001] The invention relates to the field of chemical product production, in particular to a preparation method of sodium pyroantimonate. Background technique [0002] Sodium pyroantimonate is a deep-processed product of antimony. It is a white powder of cubic crystal form. It is mainly used as a clarifying agent for tube glass, optical glass and high-grade glass, a flame retardant for textiles and plastic products, and a flame retardant for enamel and ceramic products. Whitening agent, etc. There are many methods for producing sodium pyroantimonate, including sodium nitrate oxidation, chlorination, potassium salt method and sodium salt method. Among them, the sodium salt method has the advantages of simple process, easy operation and high production efficiency. Most enterprises use the sodium salt method to prepare sodium pyroantimonate, which can control the output and quality. [0003] The sodium salt method can be divided into indirect method and direc...

Claims

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Application Information

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IPC IPC(8): C01G30/02
CPCC01G30/023C01P2002/72C01P2004/03
Inventor 唐好唐新村唐攒浪刘好男
Owner YIYANG SHENGLI CHEM IND
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