Method for synchronously preparing metastannic acid through ultrasonic enhancement and hydrolysis of low-concentration nitric acid

By using ultrasound-enhanced low-concentration nitric acid-hydrolysis to prepare metastannic acid at normal pressure and low temperature, the problems of environmental pollution and equipment complexity in existing technologies have been solved, achieving a green preparation effect with high purity and high yield.

CN121823641APending Publication Date: 2026-04-10KUNMING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610130886.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-30
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

The existing concentrated nitric acid method for preparing metastannic acid has problems such as serious environmental pollution, complex equipment, dangerous operation, low product purity and many impurities. The high-pressure method has complex equipment, and the co-oxidation method requires the addition of external oxidants and is costly. There is a lack of green preparation processes with zero nitrogen oxide emissions and at low temperature and normal pressure.

Method used

A method for preparing metastannic acid by simultaneous ultrasonic enhancement of low-concentration nitric acid-hydrolysis is adopted. Through the ultrasonic mechanical effect and cavitation effect, oxidation-hydrolysis is completed in one step at normal pressure and low temperature. This method destroys the passivation layer on the tin sheet surface, promotes the hydrolysis of tin ions and refines the particles, and avoids the violent reaction of high-concentration nitric acid.

Benefits of technology

The preparation of high-purity metastannic acid has been achieved with a yield of ≥95%, no nitrogen oxide emissions, simple and safe equipment, low production cost, and is suitable for large-scale production.

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Abstract

The invention relates to a method for synchronously preparing metastannic acid through ultrasonic enhancement and hydrolysis of low-concentration nitric acid, and belongs to the technical field of metastannic acid preparation. The preparation method comprises the following steps: slowly adding high-purity tin sheets into a dilute nitric acid solution in batches under the stirring condition at the temperature of 35-60 DEG C, and uniformly mixing to obtain a mixed system; and at the temperature of 35-60 DEG C, ultrasonic waves are applied to the mixed system for an ultrasonic enhanced oxidation dissolution-hydrolysis reaction for 30-50 min, so that tin sheets are oxidized and dissolved and are synchronously hydrated to generate metastannic acid precipitates, solid-liquid separation is carried out, solids are sequentially washed and dried, and a high-purity metastannic acid product is obtained. A passivation layer on the surface of the tin sheet is destroyed by utilizing the mechanical effect of ultrasound, and mass transfer is accelerated; the ultrasonic cavitation effect is used for promoting particle refinement and gel network depolymerization, and tin ion hydrolysis is promoted. The method is carried out at normal pressure, low acidity and low temperature, no nitrogen oxide brown smoke is generated in the whole reaction process, the metastannic acid yield is larger than or equal to 95%, and the method has the advantages of being mild in reaction, environmentally friendly, high in efficiency and good in product purity.
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