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Concentration of RE from (NH_4)_2SO_4 Type Leachate with Emulsion liquid Membrane

ZHANG Rui-hua
Rare Metals and Cemented Carbides | Vol., Issue 4, 1996 | pp. 12-16
This is a continue of the work-- 'The concentration of REfrom NaCl--type leachate with emulsive liquid membrane', made byauthor, but for (NH4)2SO4 type feed.It includes the following experiments: feed type comparision (NaCl--type or (NH4)2SO4--type). NaAcaddition amount, with or without paraffin in membrane phase, membranerecovery and reuse. A suitable liquid membrane system (N205-- P507-kerosene--HCl) is obtainel for concentrating RE from (NH.),SO. typeleachate. The concentration of RE in rich liquid from membran ecan reach 102g/L with extraction efficiency of 93q0.
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Carbothermic Reduction of TiO_2 in N Atmosphere ──A Study for Direct Compounding TiCN Solid Solution

WANG Hui-ping;ZHOU Shu-zhu
Rare Metals and Cemented Carbides | Vol., Issue 4, 1996 | pp. 25-29
A systematic thermodynamical study on carbothermic reduct toil of TiO, in N atm3;Jllere for direct compounding TiCN sold solutionis made, The influencs of technological conditions (temperature, tim.of reaction, partial pressure of N. carbon amount) on composition andproperty of the TiCN powder is described.
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Study on Rolling of Tungsten Bar

LI Yu
Rare Metals and Cemented Carbides | Vol., Issue 4, 1996 | pp. 29-34
The paper describes the use of KOCKS three--high mill,instead of the traditional rotary forging, to break down the 3 kgtungsten bar, and shows that the break down by rolling can solve thedifficulty in working of .'snoxv' crystall blank and lower the tungstenblank density retluirement. Over the f oafed tungsten bar, the rolledtungsten bar has signficant advantages as regards product quality,diameter uniformity, surface state, energy consumption and productivitr'
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Progress of Tungsten Soda Digesting Technology

NING Hua
Rare Metals and Cemented Carbides | Vol., Issue 4, 1996 | pp. 44-48
The paper reviews the tungsten soda digesting technologic andits development, and points out that tile ncals technology for tungstensoda digesting in hot ball mill(Li Honggui et al) which combines themilling, mechanical activation and digesting into one operation is anadyanced one. It not only can simpli fy the technology, but reduce thesoda consumption b3' 20qO--3040 and> decrease the di besting temperatare by30℃ ￣40℃.
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