Determination of alumina content in brown corundum
[China Aluminum Network] Brown corundum blocks are mainly made of bauxite, carbon and iron scraps after high-temperature arc melting. The quality of the selected materials largely determines the quality of brown corundum produced. The alumina content of bauxite generally used must meet the standard, even higher than the actual standard. At the same time, it is necessary to strictly follow the process in the production process to minimize the impact of impurities on brown corundum products.
Brown corundum is generally divided into three grades based on its alumina content, so the alumina content is a more important indicator of the quality of brown corundum products. Generally brown corundum alumina content of 95-97%, the higher the content, the greater the hardness, the better the quality.
The alumina content in brown corundum powder is mainly determined by the EDTA volumetric method. When the alumina content is measured by this method, the content of other impurities in brown corundum is first tested, and the content of alumina in the corundum is obtained through calculation. The method is complicated and the steps are very high. Cumbersome, the value obtained also has some deviation. At present, the content of alumina can also be measured by the complexation titration of chelating acid chelating titanium EDTA with mandelic acid. This method can directly measure the content of alumina without additional data, which not only reduces the testing procedure, but also obtains accurate data.
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