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Preparation method of high-purity potassium stannate

A potassium stannate, high-purity technology, applied in chemical instruments and methods, tin compounds, inorganic chemistry, etc., can solve the problems of high equipment, long process, nitrogen oxide emission, etc., achieve high economic and environmental benefits, metal recovery High rate, no three wastes discharge effect

Active Publication Date: 2020-06-19
深圳星河环境股份有限公司
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  • Abstract
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Problems solved by technology

As can be seen from the existing publicly reported literature, the production method of potassium stannate mainly adopts chemical synthesis methods, such as the Chinese patent whose publication number is CN1546383A discloses a kind of preparation method of potassium stannate, which is to adopt tin and concentrated nitric acid to generate β-stannic acid, then heat β-stannic acid and potassium hydroxide to form a solution, cool, add water to dissolve, filter, evaporate and concentrate to separate out the crystalline product potassium stannate, the inventive method has a long process, and the nitrate radicals in the product are relatively Difficult to clean, nitrogen oxides will be emitted when tin reacts with nitric acid to synthesize metastannic acid, and the process is not environmentally friendly; the Chinese patent with publication number CN102863016A discloses a preparation method of potassium stannate, which uses tin flower, hydrogen peroxide, hydrogen Potassium oxide as raw material, one-step synthesis of potassium stannate
The invention has the characteristics of simple preparation process, no harmful and toxic gases such as ammonia gas and nitrogen oxides, no use of high temperature or high pressure, energy saving and environmental protection, etc., but the process uses a large amount of hydrogen peroxide as raw material, and the production cost is relatively high. Potassium stannate is synthesized under high temperature, high alkali and high oxidation conditions, which requires high equipment, and the appearance of potassium stannate is often unqualified due to equipment corrosion

Method used

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  • Preparation method of high-purity potassium stannate
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  • Preparation method of high-purity potassium stannate

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preparation example Construction

[0019] A kind of preparation method of high-purity potassium stannate proposed by the present embodiment comprises the steps:

[0020] S1, the configuration of potassium hydroxide solution: configure a potassium hydroxide solution with a mass concentration of 10% to 20%, and filter it for later use; it should be noted that the concentration of the potassium hydroxide solution is preferably 12% to ensure subsequent reactions High crystallization rate and strong fluidity.

[0021] S2, pretreatment of ion-exchange membrane: Install the ion-exchange membrane into the isolated electrolytic cell, inject the potassium hydroxide solution configured in S1 into the anode area, inject pure water into the cathode area, and detect the cathode area and the anode area after standing for a period of time The content of chloride and sulfate, make the content of chloride and sulfate less than 10ppm, complete the pretreatment of ion exchange membrane;

[0022] S3, preparation of potassium stann...

Embodiment 1

[0030] Add pure water into the dosing tank to start stirring, add a certain amount of potassium hydroxide to make the mass concentration of potassium hydroxide 20%, and then add the potassium hydroxide solution to the 40mm thick tin anode plate and 10mm thick stainless steel Diaphragm electrolyzer of the plate, the cathode and anode areas are separated by anion heterogeneous exchange membrane, and the current density is adjusted to 3.0A / dm 2 , the temperature is 80°C, when the mass concentration of tin ions in the anode area is 10%, take out the electrolyte in the anode area, re-inject 20% potassium hydroxide solution, and continue the electrolysis. After filtering the electrolyte in the anode area, Heating and concentrating under reduced pressure in a vacuum until most of the crystals appear, cooling to room temperature, centrifuging and sieving to obtain high-purity potassium stannate trihydrate crystals.

Embodiment 2

[0032] Add pure water into the dosing tank to start stirring, add a certain amount of potassium hydroxide to make the mass concentration of potassium hydroxide 10%, and then add the potassium hydroxide solution to the 30mm thick tin anode plate and 5mm thick stainless steel Diaphragm electrolyzer of the plate, the cathode and anode areas are separated by anion heterogeneous exchange membrane, and the current density is adjusted to 2.0A / dm 2 , electrolysis at a temperature of 70°C, when the mass concentration of tin ions in the anode area is 5%, take out the electrolyte in the anode area, re-inject 5% potassium hydroxide solution, continue electrolysis, and filter the electrolyte in the anode area Afterwards, high-purity potassium stannate trihydrate was obtained after vacuum concentration, centrifuge separation and vacuum drying.

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Abstract

The invention discloses a preparation method of high-purity potassium stannate. The preparation method is characterized by comprising the following steps: preparing a potassium hydroxide solution; pretreating an ion exchange membrane; preparing a potassium stannate solution; and preparing a potassium stannate crystal. According to a technical scheme in the invention, the technological process of production of potassium stannate is simplified, and the preparation purity of potassium stannate is improved.

Description

technical field [0001] The invention relates to the field of preparation methods of alkali metal stannates, in particular to a preparation method of high-purity potassium stannate. Background technique [0002] Potassium stannate is a tin-containing alkaline inorganic compound, usually with three crystal waters, its molecular formula is K2SnO33H2O or K2Sn(OH)6, it is easy to absorb carbon dioxide in the air and become potassium carbonate and metastannic acid. Potassium stannate is a basic tin chemical raw material, which is widely used in various industries such as electroplating, chemical analysis, catalysis, and synthesis of tin chemical products. As can be seen from the existing publicly reported literature, the production method of potassium stannate mainly adopts chemical synthesis methods, such as the Chinese patent whose publication number is CN1546383A discloses a kind of preparation method of potassium stannate, which is to adopt tin and concentrated nitric acid to ...

Claims

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Application Information

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IPC IPC(8): C01G19/00C25B1/22C25B13/02
CPCC01G19/00C25B1/22C25B13/02
Inventor 谈珏
Owner 深圳星河环境股份有限公司
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