Method for preparing potassium stannate

A technology of potassium stannate and stannic acid, applied in chemical instruments and methods, tin compounds, inorganic chemistry, etc., can solve the problems of difficult to obtain pure potassium stannate products, difficult purification treatment, high production cost, etc., and achieve easy operation , low preparation cost and simple process

Active Publication Date: 2004-11-17
SHANGHAI NO 4 REAGENT & H V CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to our research on the preparation of potassium stannate products, using tin salt solution to prepare α-stannate gel to prepare potassium stannate, the production cost is relatively high, and it is not easy to purify, so it is difficult to obtain pure potassium stannate products. Therefore, people look forward to a new method for preparing potassium stannate to meet the market's requirements for pure potassium stannate products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation of embodiment 1 potassium stannate

[0016] Heat the metal tin block at about 300° to melt it, remove impurities, and then pour the melted tin into cold water to obtain snowflake-like metal tin, usually called tin flower. React 20g (0.1685mol) tin flower (content 99.9%) with 200g (3mol) concentrated nitric acid (content 95%) at room temperature, and the reaction time is 7 hours to generate white powdery β-stannic acid. Stir and wash with hot water until the pH of the aqueous solution is 5.5, and dry to obtain 28.3g of β-stannic acid with a purity of 99.5%, which is then used to prepare potassium stannate. It is more convenient in technology to discard the supernatant of the β-stannic acid of precipitation, directly the pasty feed liquid of precipitation β-stannic acid is stirred and mixed with 50g (0.714mol) potassium hydroxide (content 80%), and The mixed material liquid is put into an electric heating container to be heated and melted, the eutectic re...

Embodiment 2

[0019] The preparation of embodiment 2 potassium stannate

[0020] 100g (0.8425mol) tin flower (content 99.9%) and 2000g (30.15mol) concentrated nitric acid (content 95%) were reacted at normal temperature, and the reaction time was 4 hours to generate white powdery β-stannoic acid, and the β-stannic acid was used in 80~90 The hot water of ℃ is stirred and washed to aqueous solution pH5.5, discards the supernatant liquid of the β-stannic acid of precipitation, then the pasty feed liquid of precipitation β-stannic acid is mixed with 413g (5.90mol) potassium hydroxide (content 80% ) stirring and mixing, put the mixed feed liquid into an electric heating container to heat and melt, the eutectic reaction temperature is 260-270° C., and the reaction time is 12 hours. The molten liquid is in the form of a solution, and the heating is stopped. Cool to about 150°C under stirring to form a paste or block, slowly add water to dissolve it, and adjust the solution concentration between 12...

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Abstract

The invention provides a process for preparing postassium stannate comprising, producing beta-stannic acid by tin and concentrated nitric acid, heating betastannic acid and potassium hydroxide for congruent melting into solution, cooling down, watering for dissolution, filtering, evaporating and concentrating to separate crystallized product of postassium stannate. The process according to the invention can be applied to obtain high purity postassium stannate end product with the yield over 98.5%, thus is suitable for industrial mass production.

Description

technical field [0001] The invention relates to a preparation method of inorganic compound potassium stannate, in particular to a preparation method of potassium stannate inorganic tin salt compound. Background technique [0002] Potassium stannate is an alkaline inorganic compound containing tin. The product is white crystal, easily soluble in water, and the solution is alkaline. Potassium stannate is widely used in the electroplating industry, mainly used in tin plating of electronics, automobile manufacturing, canned food boxes, etc.; it is also used in textile printing and dyeing industry, glass, ceramics, coinage and other industries. At present, the domestic tin plating industry mainly uses acid tin salt compounds, and the use of acid tin plating solution produces serious waste pollution during the tin plating process, and it is difficult to deal with. The tin plating process uses potassium stannate, which can reduce the pollution of three wastes, and is an excellent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/00
Inventor 顾榴根
Owner SHANGHAI NO 4 REAGENT & H V CHEM
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