钼精矿中铀的测定

酸法溶矿,加入氨水,钼形成（NH4）2MoO4、铜形成络离子：Cu（NH4）4]2＋留在溶液里,过滤除去钼、铜。滤渣经2%盐酸溶解,铅与残渣留在滤纸上,铁等金属元素与铀以离子形式存在滤液中。在滤液中加入EDTA,用氨水调节溶液的酸度,控制溶液的pH=7±0.5,铀以（NH4）2U2O7形式沉淀,铁形成Fe（OH）Y络离子,过滤分离。该方法的加入标准回收率为98.8%～101.4%。

Determination of uranium in the molybdenum concentration

Minerals are dissolved by acid solution and ammonia is added to the solution,then molybdenum will form（NH4）2MoO4,copper will form complex ion：Cu（NH4）4]2＋ remains in solution. Molybdenum and copper are removed by filtering. The residue is dissolved by 2% hydrochloric acid,lead and residues will leave in the filter paper,iron and other metals and uranium exist in the filtrate in the form of ion. Adding EDTA to the filtrate and adjust the acidity with ammonia to pH=7±0.5,the uranium will precipitate in the form of （NH4）2U2O7,iron will form Fe（OH）Y complex ion. By filtering and separating,uranium will be obtained. Recovery of the method is 98.8%-101.4%.