A new bleach agent for bentonite was adopted that had greater reducibility to impurity iron in the alkaline medium.

• 通过对膨润土的漂白试验，选用了一种新的漂白剂，它在碱性条件下对杂质铁具有较强的还原性，漂白后再加入一种络合剂稳定残余铁。