Extraction of Rare Earth from Black Weathering Mud

A black weathering mud containing rare earth in Southwest China contains about 3%～7% RE2O3. RE in the weathering mud mainly exists on the amorphous Mn-Fe oxide, which can not be enriched by physical beneficiation methods such as floatation, magnetic and electrostatic separation or gravity concentration etc, and can not also be exchanged by salts. Chlorinating roasting is selected to treat the black weathering mud based on the thermodynamic analysis and the properties of mud in the paper. The chlorinating roasting treatment is divided two stages. The first step is to heat the mud mixed NH4Cl and carbon with (1.5～2.5)∶10 of NH4Cl/mud ratio at 200℃ for 1 h. NH4Cl directly chlorinates the RE2O3 in the weathering mud, but do not destroy Mn-Fe amorphous structure. The secondary stage is to heat the mixture to above 350℃, NH4Cl decomposes to NH3 and HCl, and carbon in the mixture also takes part in chlorinating of RE. Recovery of RE reaches to 91.6% under the conditions of temperature 450℃ and roasting for 2 h, and Pb and Mn can be further recovered at the same time.

作 者： Zhu Guocai Chi Ru'an   作者單位： Institute of Nuclear Energy Technology, Tsinghua University, Beijing 102201, China  刊 名： 稀有金屬（英文版）  EI SCI 英文刊名： RARE METALS  年，卷(期)： 1999 5(1)  分類號： O6  關鍵詞： Extraction   Rare earth   Weathering mud  

【Extraction of Rare Earth from Black 】相關文章：

Building rare earth industrial chain (continued)04-26

新概念英語第三冊第55課:From the earth Greetings12-18

Red and Black05-04

Special lecture on rare earths held in Inner Mongolia04-26

Black Market(Underground Economy) 黑市05-04

learn from steven spielberg05-24

趣談blue,black… 等表示顏色的詞05-04

Google Earth帶你放眼世界04-27

地球與我英語作文The earth with me04-25

Chapter 26: Writing from Reading05-04