Method for producing high-purity bismuth oxide from bismuth-containing materials

Abstract

The invention discloses a method for producing high-purity bismuth oxide from bismuth-containing materials. The method includes the steps that firstly, a bismuth-containing material and a hydrochloricacid solution are subjected to a leaching reaction, so that bismuth in the bismuth-containing materials enter the solution in a bismuth chloride form, and leachate and leaching residues are separated; secondly, pure water is added into the leachate, and a hydrolysis reaction is carried out on the bismuth chloride to precipitate bismuth oxychloride; thirdly, the precipitated bismuth oxychloride isseparated out, a dilute alkali solution is added, and the bismuth oxychloride is converted into bismuth hydroxide under the condition of low-temperature dilute alkali; fourthly, a concentrated alkalisolution is added into the filtered bismuth hydroxide, and the bismuth hydroxide is converted into bismuth oxide by using high-temperature concentrated alkali; finally, the generated bismuth oxide iswashed, dried and screened to obtain the high-purity bismuth oxide. According to the method, the bismuth-containing materials serve as the raw materials, so that bismuth enters the solution in the bismuth chloride form and then is hydrolyzed into bismuth oxychloride, and bismuth oxide is generated through low-temperature dilute alkali conversion and high-temperature concentrated alkali conversion. The method is simple in procedure, the consumption of reagents is small, and impurities such as Fe, Pb, Sb and As can be deeply purified and separated.

Description

technical field [0001] The invention relates to the technical field of bismuth oxide production, in particular to a method for producing high-purity bismuth oxide from bismuth-containing materials. Background technique [0002] Bismuth oxide is an important raw material in light industry, chemical industry, ceramics, electronic components and pharmaceutical industry. It is also suitable for the manufacture of high refractive index glass, nuclear industry glass and nuclear reactor fuel. The traditional method of producing bismuth oxide is to use refined bismuth as the raw material, put the bismuth nitrate obtained from nitration concentration and crystallization into cans, put it into a calciner, calcinate and denitrify at a temperature of 500-600°C, and crush it to obtain bismuth oxide products . Due to the fact that there is a large amount of toxic gas NO in the process of preparing bismuth oxide directly from bismuth nitrate calcination X Overflow will cause air pollutio...

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Problems solved by technology

[0003] Based on solving the long production process, complicated process and high cost of bismuth oxide in the prior art, and the carcinogen NO X For the problems caused by the large pollution to the environment, this application proposes a method for producing high-purity bismuth oxide from bismuth-containing materials, which can deeply purify and separate impurities such as Fe, Pb, Sb, As, etc.

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