The calcination and secondaryacid leaching process were used to remove iron and aluminum in the pyrite tailings in the tests.
试验采用了煅烧、二次酸浸工艺，进行硫铁尾矿酸浸除铁和铝试验。
2
Secondary cells and batteries containing alkaline or other non-acid electrolytes - Nickel-cadmium prismatic secondary single cells with partial gas recombination.
含碱性或其他非酸性电解质的蓄电池和蓄电池组。部分气体复合的镍镉柱状二次单电池。
3
Aluminum and its alloy with decorate ceramic oxide coating were developed by secondary oxidation process in sulfa-salicylic acid bath and an organic acid bath.