其次是硫酸浸取，研究了硫酸过量系数、酸浸温度和酸浸时间对铁的浸出率的影响。
The effect of vitriol excess coefficient, reaction temperature and reaction time on the leaching ratio has been studied.
传统浸酸铬鞣存在着一些不容忽视的问题，如：铬的吸收率低，浸酸时带来的盐污染，鞣制周期长等。
There exist some unassailable problems in traditional chrome tanning, such as low exhaustion of chrome, salt pollution from pickling, and time-consuming process, etc.
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。
The calcination and secondary acid leaching process were used to remove iron and aluminum in the pyrite tailings in the tests.
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