化学氧化法处理高硫铝土矿生产氧化铝实践

Plant Practice of Producing Alumina from High Sulfur Bauxite by Chemical Oxidation Method

某氧化铝厂使用高硫铝土矿生产氧化铝,给生产带来很大影响:氧化铝产品铁含量升高、设备腐蚀加大、沉降效果变差等。针对这些问题开展研究和工业试验,明确了在氧化铝生产的高温溶出过程中添加硝酸钠化学氧化脱硫反应的原理和氧化效果,对搭配使用高硫铝土矿含硫在0.3%左右时,添加少量硝酸钠可以长期维持氧化铝产品的含铁量在一级品范围内。该技术简单有效且经济,可以在工业生产中推广使用。

A alumina plant uses high-sulfur bauxite to produce alumina,which brings great influence to production:iron content of alumina product increases,equipment corrosion increases,and settlement effect becomes worse.To address these issues,research and industrial tests were carried out.The principle of chemical oxidation desulfurization reaction and oxidation effect with sodium nitrate in high temperature dissolution process of alumina production were clarified.When sulfur content of high-sulfur bauxite is about 0.3%,adding a small amount of sodium nitrate can maintain iron content in alumina products within the range of first-grade products for a long time.This technology is simple,effective and economical,and can be widely used in industrial production.