EXPERIMENTAL STUDY ON THE REMOVAL OF BISMUTH FROM LEAD WITH CALCIUM MAGNESIUM
DOI:
https://doi.org/10.53002/064Ключевые слова:
vacuum separation of bismuth from lead, adjuvant transformation, vacuum gasification, high-temperature dissociation, separation and purificationАннотация
The separation of lead from the bismuth mixture remains a serious problem, and achieving effective separation is an important obstacle to the production of high-purity lead using the vacuum gasification method. This research focuses on lead as a core research discipline, conducting theoretical and experimental studies on the secondary conversion of lead through vacuum gasification. Gibbs free energy calculations show that in the temperature range from 600 to 610 K, the bismuth compound completely reacts with calcium and magnesium, resulting in the formation of the CaMg2Bi2 compound. Under optimal experimental conditions, the bismuth compound is converted to CaMg2Bi2 BiCa2. It should be noted that BiCa2 does not fly and remains in the crucible as a residue. Auxiliary calcium is completely converted into CaSe and CaTe, which leads to a decrease in the calcium content in volatile substances from 0.5% to 16 ppm. Similarly, the magnesium content in volatile substances is reduced from 0.66% to 187 ppm. Eventually, the bismuth content in the final product decreases from 6 ppm to 1.4 ppm, reaching a removal rate of 76.6%, and the direct yield of metallic lead reaches 71%. This process effectively facilitates the separation of metallic lead from bismuth impurities.
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