氧化铝厂分解工序中有机物的去除策略研究OA

In order to solve the problem of organic matter accumulation in mother liquor caused by imported bauxite in Bayer process alumina production,a collaborative removal strategy of"seed crystallization fine seed washing mother liquor thickening"was proposed to improve the organic matter removal efficiency and balance the economy.The process parameters were optimized by orthogonal experiment and response surface method,and the expansion test was carried out.Laboratory tests showed that the removal rate of organic carbon was 55%～60%;The pilot test results show that the process can reduce the Na2O content in the product from 0.35%to less than 0.22%,and the working cycle of the filter cloth of the vertical plate filter is extended from about 15 days to 30 days.The technical and economic analysis shows that the annual comprehensive loss is reduced by about 4.3 million yuan,and the investment payback period is about 2.5 years.The strategy effectively balances the removal rate and economy,and provides technical reference for alumina plants with high organic carbon load.