关键词: 明矾, 食品添加剂, 节能减排, 氢氧化铝, 重金属

Abstract: A new technology，which uses aluminum hydroxide instead of bauxite for the production of food additive alum was introduced.In the process，aluminum hydroxide，sulfuric acid，and potassium sulfate completely reacted in an enamel reactor. And then high-quality alum could be obtained through the procedures，such as crystallization，crushing，and packing.The new technology solved the problem of exceeded heavy metals when using bauxite as raw material.Furthermore，it greatly shortened the process flow，reduced energy consumption and prevented the generation of slag.Therefore，the new technology has many advantages，such as short flow，environmental-friendly，safety，and high-quality.

Key words: alum, food additives, energy conservation, aluminum hydroxide, heavy metal