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Thermodynamic Behavior of Materials during Crushing and their Influence on Oxygen Content of the Na-reduced Ta Powder

OU Yang-nan
Rare Metals and Cemented Carbides | Vol., Issue 4, 1996 | pp. 1-6
As a matter of record, using the thermodynamic theory ofmaterial crushing, the process of crushing of Ta lump is analysed. Itshoals the etistenc3 a-catty tiings of lit3tantaneous high temperature i'crushing process in open--type e4uipment, which resu its in format ionof Ta oxide and oxynitride .Oxygen enrichment of Ta powder from thisoperation is estimated and discussed. The conclusion is that crushingprocess of the Na--reduced Ta lump is a oxygen enriched one. so w.must give the matter thought.
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Coprecipitation Preparation and Characterization of Mixed Rare Earth Oxide Fine Powders

YANG You-ping;HUANG Ke-long;LIU Zhi-guo
Rare Metals and Cemented Carbides | Vol., Issue 4, 1996 | pp. 8-12
Using rare earth oxide(RE 95%)as raw material. mixed rareearth oxide fine powders were prepared by coprecipitation method inwhich urea--aqua ammonia adhere tised to adjtlst the system PH in heatedsolution. The in f luences of preparation condition for products werediscussed init laily. The f me poal-ders were character lied by thermogravimetric, differential thermal analysis, sweep electron microscope,infrared spectrum. The result sho-tvs that mixed rare earth oxide finepowders can be obtained. and under the selected conditions its gra in sizeis about 1 ￣1. 5μm.
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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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