求翻译：做预处理。先正常加入化学品， 前几种化学品比例不变，将化学品IV的比例提高到1%（说明书写的是0.5%） 。加热到100c后静置20小时以上，表面的油进行处理。下面的油放出来。这样白土用量估计可以降低到30%。过滤速度也会加快。是什么意思？

Do preprocessing. The first normal by adding chemicals, the same proportion of first of several chemicals, chemicals iv had risen to 1% (manual written by 0.5%). Heated to 100c after standing for more than 20 hours, the surface of the oil processing. Following the oil is released. Such clay the amou

Do pre-processing. adding chemicals to work properly, the first few of such chemicals are not in proportion to the percentage of chemical IV increased to 1% (0.5 % is written in). After heating to 100c put more than 20 hours, on the face of the oil for processing. The following oil on it. This clay

正在翻译，请等待...

Pretreatment. Normal join chemical, chemical scale invariant before, raising the percentage of chemicals IV to 1% (note is written in 0.5%). Heated to 100c standing after more than 20 hours, oil on the surface for processing. Following the oil out. This dosage can be reduced to an estimated 30% clay

正在翻译，请等待...