1. Gather the sample of suspected hazardous waste (the chromium dreg), measured chromium in the lixivium, confirmed its property, analyzed its characteristic of pollution.

2. The principle, method and case history how to predict the average uranium mass concentration in lixivium of in-situ leaching are introduced and the existing problems are discussed.

3. The units which are used for extracting uranium from the lixivium of in situ leaching(or heap leaching) are all the packed bed with ion exchange of high efficiency.