Method for producing sodium stannate

A production method and technology of sodium stannate, applied in chemical instruments and methods, tin compounds, inorganic chemistry and other directions, can solve the problems of reducing the direct recovery rate of tin, low direct recovery rate of tin, increasing consumption per ton of product, etc., and achieving less impurities , The effect of complete response and fast response

Inactive Publication Date: 2010-02-10
YUNNAN TIN GROUP HLDG
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  • Summary
  • Abstract
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Problems solved by technology

Substituting tin ore with a tin grade of 26% for tin concentrate with a tin grade of 46% can also produce qualified sodium stannate, but the tin leaching rate has decreased and the consumption per ton of product has increased
[0006] According to the inventor's research on the pilot production of sodium stannate for many years, the above two methods for preparing sodium stannate all have deficiencies: (1) the indirect method takes expensive refined tin as raw material, and the raw material cost is high
Impurities such as lead and antimony contained in refined tin are higher than the corresponding impurities contained in sodium stannate products produced from these refined tin as raw materials. Therefore, the leaching solution needs to be purified and removed, causing part of the tin to enter

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  • Method for producing sodium stannate

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example 1

[0024] Under airtight conditions, chlorine gas is added to metal tin, and the chlorination reaction generates tin tetrachloride. Slowly add 600kg of tin tetrachloride to 600kg of water, cool to room temperature, stir, add 800kg of 45% sodium hydroxide aqueous solution to it, and keep stirring and cooling during the neutralization process, keep the reaction temperature at 60℃~80℃, adjust the hydroxide The amount of sodium added to control the neutralization end point pH value of 6-7. After the neutralization operation is completed, 6000kg of water is added each time, and the precipitate is washed 3 times. The washing water produced in the third washing of this tank is used as the second washing water for the precipitation of the next tank, and the washing water generated from the second washing of this tank is used as the first washing water for the precipitation of the next tank. The washing water produced in the first washing is sent to the chlor-alkali industrial electrolysi...

example 2

[0026] Under airtight conditions, chlorine gas is added to metal tin, and chlorination reaction produces tin tetrachloride. Slowly add 600kg tin tetrachloride to 600kg water, cool to room temperature, add it to 800kg weight of 45% sodium hydroxide aqueous solution, and keep stirring and cooling during the neutralization process, and keep the reaction temperature at 60℃~80℃ , Adjust the amount of tin tetrachloride added, and control the neutralization end point to pH 7-8. After the neutralization operation is completed, 6000kg of water is added each time, and the precipitate is washed 3 times. The washing water produced in the third washing of this tank is used as the second washing water for the precipitation of the next tank, and the washing water generated from the second washing of this tank is used as the first washing water for the precipitation of the next tank. The washing water produced in the first washing is sent to the chlor-alkali industrial electrolysis to produce...

example 3

[0028] Take 120kg of ammonium bicarbonate, 240kg of concentrated ammonia water, and 600kg of water, mix, stir, slowly add 300kg of tin tetrachloride, adjust the amount of tin tetrachloride, control the neutralization end point pH value of 6-7, temperature 40℃-60℃. After the neutralization operation is completed, add water to wash the sediment 3 times, add 3000 kg of water each time, stir for 10 minutes, clarify for 4 hours, and discharge the supernatant by siphoning. After the washed precipitate is filtered with a plate and frame filter, orthostannic acid is obtained. Weigh, sample and test the tin content, calculate the weight of tin contained in stannic acid, weigh sodium hydroxide according to the molar ratio of sodium hydroxide to tin 2:1, add to stannic acid, stir and mix, and heat to 85°C , Concentrated crystallization, centrifugal filtration, recycling of crystallization mother liquor, the filter cake is dried and crushed to obtain 330kg of sodium stannate product, conta...

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Abstract

The invention belongs to a technique for producing inorganic compound sodium stannate, and more particularly relates to a method for preparing the sodium stannate by adopting stannic chloride. The technique comprises the steps: (1) neutralizing stannic chloride by alkali, obtaining precipitate and washing by water, solid-liquid separation, and obtaining stannic acid; (2) synthesizing the sodium stannate by using the stannic acid and sodium hydroxide, concentrating, crystallizing, filtering, drying and crushing the sodium stannate, and obtaining the product of sodium stannate. The method has easy operation and complete reaction of all steps, simplifies the process flow, can improve the direct recovery rate of tin, and reduces the production cost, thus being capable of producing the sodium stannate in industrialized scale.

Description

Technical field [0001] The invention belongs to a production process of inorganic compound sodium stannate, in particular to a method for preparing sodium stannate by using tin tetrachloride. Background technique [0002] Sodium stannate is an alkaline inorganic compound containing tin, often with 3 crystal water, the molecular formula is generally written as Na 2 SnO 3 ·3H 2 O, can also be written as Na 2 Sn(OH) 6 . The product is white crystalline powder, tasteless, insoluble in ethanol and acetone, easily soluble in water, and the aqueous solution is alkaline. It loses crystal water when heated to 140°C, and decomposes when exposed to acid. It is easy to absorb moisture and carbon dioxide when placed in the air and become sodium carbonate and tin hydroxide. The most important use of sodium stannate is for electroplating tin and its alloys, such as electroplating tin-zinc, tin-cadmium and tin-copper alloys. The electroplating solution has simple composition, high stability, e...

Claims

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Application Information

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IPC IPC(8): C01G19/00
Inventor 陈绍春王炜
Owner YUNNAN TIN GROUP HLDG
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