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[Chemical Knowledge]：Production and manufacturing method and process of chromic anhydride

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The manufacturing method
of chromic anhydride
1. Introduction

Chromic anhydride is an important inorganic chemical, widely used in oxidants, catalysts, pigments, electroplating, medicine and other fields. Therefore, it is of great significance to study its manufacturing method for improving production efficiency, reducing costs and improving product quality. This article will introduce the manufacturing method of chromic anhydride, including raw material preparation, reaction process, post-treatment and so on.

2. raw material preparation

1. Chromium ore: The main raw material of chromic anhydride is chromium ore, its main component is chromite (FeCr2O4), and it also contains some impurities such as silicon, aluminum, calcium, magnesium, etc.
2. Sulfuric acid: used as oxidant and reaction medium.

3. reaction process

The manufacturing process of chromic anhydride mainly includes the following steps:

1. Roasting: roasting chromium ore to a certain temperature to decompose it into chromium oxides.
2. Leaching: Leaching the roasted chromium ore with sulfuric acid to generate chromium sulfuric acid and ferrous sulfate.
3. Oxidation: The chromium sulfuric acid in the leaching solution is oxidized to chromic acid with an oxidizing agent (such as nitric acid).
4. Crystallization: The oxidized solution is cooled and crystallized to obtain chromic anhydride crystals.

4. post-treatment

1. centrifugal separation: the crystallization of mother liquor and chromic anhydride crystals for centrifugal separation, pure chromic anhydride crystals.
2. Drying: The centrifuged chromic anhydride crystals are dried to obtain the final chromic anhydride product.
Precautions for
5.

1. During the roasting process, it is necessary to control the temperature and time to avoid incomplete decomposition of chromium ore due to excessive roasting.
2. In the leaching process, it is necessary to control the concentration of sulfuric acid and leaching time to improve the leaching rate of chromium.
3. In the oxidation process, it is necessary to select the appropriate oxidant and oxidation conditions to ensure the complete oxidation of chromium sulfuric acid.
4. During the crystallization process, it is necessary to control the cooling rate and crystallization time to obtain larger crystals and higher yields.

6. Conclusion The manufacturing method of

chromic anhydride includes raw material preparation, reaction process and post-treatment, and it is necessary to control the process parameters of each link to ensure the quality and yield of the product. At the same time, it is also necessary to pay attention to safety and environmental protection issues to ensure the smooth progress of the production process.

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