ABSTRACT

This paper provides and overview of current and emerging processes to produce high purity alumina, HPA. Strong demand for HPA is projected to continue for the coming decade at least, driven by its critical role in the manufacture of LEDs and Li-Ion battery separators which require 4N (99.99% Al₂O₃) purity. The current selling price of 4N HPA is over $20,000/t. Most HPA is currently produced from high purity aluminum, a very expensive feedstock. Under these conditions there is considerable interest in new production from lower cost starting materials, including SGA, Bayer process ‘hydrate’, alumino-silicate clays, and other aluminous minerals.

摘要

本文概述了生产高纯度氧化铝 HPA 的当前和新兴工艺。HPA 的强劲需求预计至少在未来十年内将持续下去，因为它在 LED 和锂离子电池隔膜的制造中发挥着关键作用，这些隔膜需要 4N（99.99% Al ₂ O ₃）纯度。目前 4N HPA 的售价超过 $20,000/t。大多数 HPA 目前是由高纯度铝生产的，这是一种非常昂贵的原料。在这些条件下，人们对使用低成本起始材料（包括 SGA、拜耳法“水合物”、铝硅酸盐粘土和其他含铝矿物）进行新生产具有相当大的兴趣。