Method for preparing reagent-grade grade stannic oxide powder

Abstract

The invention provides a method for preparing reagent-grade grade stannic oxide powder, which is applicable to chemical analysis, conductive glass, semiconductor materials, and high-end ceramic colored glaze materials. The method comprises steps of firstly inletting carbon dioxide into reagent-grade sodium stannate in the presence of a certain proportion of alcohol dispersing agent, and controlling the pH value of reaction liquid so as to prepare hydronium stannic oxide; then preparing the hydronium stannic oxide into thick liquid through pure water, adjusting the pH value of the thick liquid of the hydronium stannic oxide through strong acid so as to obtain metastannic acid; finally, placing the metastannic acid solid in a high temperature furnace for calcining and dehydrating, thereby obtaining high-purity nanoscale stannic oxide powder. According to the method, nanoscale powder can be obtained without grinding, the production process is environment-friendly, the production equipment is simple, and the method is beneficial to industrialization. The product prepared by the method has high purity and single component, and can meet the requirements of various industries such as chemical analysis, conductive glass, semiconductor materials, and high-end ceramic colored glaze materials.

Description

Technical field [0001] The present invention involves a method of preparation of a tin chemical product, especially the preparation method of a tin dioxide, and it is more specifically involved in a reagent level two suitable for chemical analysis, conductive glass, semiconductor materials, and high -end ceramic glaze.Preparation method of tin oxide powder. Background technique [0002] Tin dioxide is an important tin chemical product, which is widely used in ceramic color glaze, conductive glass, nano -tin tin metal oxides, semiconductor materials, electronic tentacles, electrical appliances, gas -sensitive sensors, catalysts and other industries.It can be seen from the published documents that the preparation methods of tin dioxide mainly include chemical synthesis method based on tin -containing waste and high temperature gasification method based on tin ingot as raw materials; Chinese patent CN102102150A discloses a kind of containing containing containingThe method of prepar...

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Problems solved by technology

It can be seen from the published literature that the preparation methods of tin dioxide mainly include the chemical synthesis method using tin-containing waste as raw material and the nitric acid method or high-temperature gasification method using tin ingot as raw material; Chinese patent CN102102150A discloses a The method for preparing tin dioxide from tin waste as raw material is a method for separating tin from waste tinplate and preparing tin dioxide. The main steps are: (1) crushing and screening the waste tinplate; (2) using soda aqueous solution to The undersize is washed; (3) the washings are filtered, the filter residue is leached with sodium hydroxide solution and an oxidizing agent, the leachate is filtered, and the filtrate is a sodium stannate solution; (4) carbon dioxide is passed into the sodium stannate solution, filtered, Washing obtains the tin dioxide product; This preparation method process route is long, and the demand to carbon dioxide is big, and utilization rate is low, and actual consumption is 10-50 times of theoretical calculation amount, and this is little in industrial feasibility, and the product The impurity content is still high

Chinese patent CN1657417 discloses a method for producing tin dioxide by nitric acid method, which is a method for wet manufacturing metastannic acid and tin dioxide powder, the main steps of which are under the condition of airtight pressurization and oxygen addition, Control a certain temperature and reaction time, so that tin and nitric acid fully react to generate metastannic acid intermediate product, metastannic acid intermediate product is neutralized, washed and dried to obtain metastannic acid product; metastannic acid is calcined and crushed to obtain a particle size smaller than 10um fine tin dioxide product; this method uses nitric acid to prepare metastannic acid, a large amount of nitrogen oxides are produced, the process is not environmentally friendly, and nitric acid is a strong acid, and the product is easily polluted due to equipment corrosion. In addition, the product requires Only after crushing can it reach 10um fine tin dioxide products, which limits the use of products in high-end electronics and other fields

The technology for preparing high-purity tin dioxide by high-temperature gasification is relatively complicated, and is limited by equipment, resulting in high production costs and weak market competitiveness

[0003]Because the high-end fields such as electronic materials have high requirements on the purity and material properties of tin dioxide, the tin dioxide produced by traditional production methods cannot meet this demand. Most still rely on imported products

Chinese patent CN101532096 discloses a method for recovering tin from tin stripping waste liquid. The process is to use strong alkali to convert tin into sodium stannate solution, and then introduce carbon dioxide to prepare metastannic acid. Metastannic acid is washed and calcined to prepare di Tin oxide, because carbon dioxide is a weak acid, the reaction with sodium stannate solution is not complete, and metastannic acid is an amorphous colloid with strong adsorption capacity. Washing metastannic acid with pure water, the sodium carbonate ion wrapped in metastannic acid is still very high , up to 3%, sodium carbonate reacts with metastannic acid to form sodium stannate during calcination, which seriously corrodes the calcination equipment, and the finished product of tin dioxide cannot meet the needs of electronic industries such as conductive glass due to high impurities

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