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Method for preparing potassium stannate

A technology of potassium stannate and tin flower, applied in chemical instruments and methods, tin compounds, inorganic chemistry, etc., can solve the problems of high energy consumption, serious environmental pollution, and high cost of potassium stannate, and achieve low energy consumption and a preparation process. Safe, easy-to-prepare effect

Inactive Publication Date: 2013-01-09
YUNNAN TIN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the existing problems of high cost, high energy consumption, and serious environmental pollution in the preparation of potassium stannate, and provide a new method for preparing potassium stannate, which has the advantages of simple preparation process, low cost, and environmental friendliness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 500 g of metal tin flowers into the reactor, then add a potassium hydroxide solution with a concentration of 10% into the reactor, start stirring, and then add hydrogen peroxide with a concentration of 5% to the above system. The molar ratio of potassium hydroxide to metal tin flowers is 2:1, and the molar ratio of hydrogen peroxide to metal tin flowers is 2:1. After reacting for 1 h at a reaction temperature of 50°C, filter, concentrate under reduced pressure, and concentrate under vacuum. is 0.04 MPa, the temperature of the concentrated solution reaches 85°C, crystallization, washing, and drying obtain potassium stannate, and the yield of potassium stannate is 17.9%.

Embodiment 2

[0019] Add 500 g of metal tin flowers into the reactor, then add a potassium hydroxide solution with a concentration of 10% into the reactor, start stirring, and then add hydrogen peroxide with a concentration of 10% to the above system. The molar ratio of potassium hydroxide to metal tin flowers is 3:1, and the molar ratio of hydrogen peroxide to metal tin flowers is 2:1. After reacting for 4 h at a reaction temperature of 70°C, filter, concentrate under reduced pressure, and concentrate under vacuum. is 0.04 MPa, the temperature of the concentrated solution reaches 85°C, crystallizes, washes, and dries to obtain potassium stannate, and the yield of potassium stannate is 37.6%.

Embodiment 3

[0021] Add 500 g of metal tin flowers into the reactor, then add a potassium hydroxide solution with a concentration of 20% into the reactor, start stirring, and then add hydrogen peroxide with a concentration of 15% to the above system. The molar ratio of potassium hydroxide to metal tin flowers is 3:1, and the molar ratio of hydrogen peroxide to metal tin flowers is 3:1. After reacting for 6 h at a reaction temperature of 70°C, filter, concentrate under reduced pressure, and concentrate under vacuum. is 0.06 MPa, the temperature of the concentrated solution reaches 95 °C, crystallization, washing and drying give potassium stannate, and the yield of potassium stannate is 94.0%.

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Abstract

The invention provides a method for preparing potassium stannate. According to the method, banca tin, hydrogen peroxide and potassium hydroxide which serve as raw materials are synthesized in one step to form the potassium stannate. The method comprises the following steps of: putting the banca tin and 10 to 40 percent potassium hydroxide solution into a reaction kettle, stirring, adding 5 to 30 percent hydrogen peroxide into the system, and reacting at the temperature of between 50 and 100 DEG C for 1 to 7 hours; and filtering, concentrating a filtrate under reduced pressure, crystallizing, filtering, washing and drying to obtain the potassium stannate, wherein the yield of the potassium stannate is up to 99.8 percent. The method has the characteristics of simple preparation process, energy conservation, environment friendliness and the like and can be used for industrial production, the generation of harmful and toxic gases of ammonia gas, nitric oxides and the like is avoided, and the potassium stannate is prepared at low temperature under normal pressure.

Description

technical field [0001] The invention relates to a preparation method of potassium stannate, which belongs to the technical field of inorganic chemical industry. Background technique [0002] Potassium stannate is an important chemical raw material, widely used in electroplating, electronics, printing and dyeing industry, glass, ceramics, coinage, automobile manufacturing, canned food boxes, compact instruments and other industrial fields. [0003] At present, there are many reports on the methods for preparing potassium stannate, but all of them have problems such as high energy consumption, use of toxic raw materials or complicated preparation processes. For example, the patent CN101544399A discloses a method for directly producing potassium stannate by using tin raw materials, that is, tin and tin alloys are chemically reacted with potassium hydroxide and potassium nitrate in a reactor at a temperature of 300°C to 600°C to obtain granular stannate. Crude potassium stannat...

Claims

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Application Information

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IPC IPC(8): C01G19/00
Inventor 贾庆明刘路坷魏兵段富良李伟李祥彦
Owner YUNNAN TIN
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