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Discussion on the Theoretical Problems from the Leaching of Molybdenite

ZHAO Zhong-wei
Rare Metals and Cemented Carbides | Vol., Issue 2, 1995 | pp. 1-3
Thes-pH diagram of Mo-S-H2O system can not satisfactorily explains the leaching process of molybdenite, thus it has beenreconstructed on the basis of the latest r.search work in this paper.Some theoretical problems from the leaching of molybdenite are analyzedaccording to the new diagram.The reason of the difficulty in molybdenite'oxidization by wet process is discussed.Possible technical ways are pointed out to enhance the leaching process.
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Recovery of Te from Bi-Te Ore

CHEN Fang-lan;CHE Wen-ting
Rare Metals and Cemented Carbides | Vol., Issue 2, 1995 | pp. 4-7
Bi-Te ore is leached with HCl+FeCl,Leached solution ishydrolyzed to recoyer BiOCl.The leached residue goes through alkalineleaching-purifica non-neutrallization to obtain TeO,or goes throughalkaline leaching-purification-reduction with Na2SO3 to obtain rough Tepowder.TeO2 and Te powder are subjected to dissolution-two-stagepurification-neutrallization-electrowinning-cast to obtain refined Te 1*
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Study on New Mining Carbides with Rare-earth Addition

LIU Chun-lin;YAN Bang-ming;FAN Zheng-kang
Rare Metals and Cemented Carbides | Vol., Issue 2, 1995 | pp. 11-13
New mining carbides ZRZo and ZR30 are developed by addictrare earths into 225 and 230.The bending strength and impact toughness-of the new alloys have been increased over 10adO with much longer servicelife.This paper has briefly discussed and analyzed the functioll of rareearth elements in mining carbides on the basis of comparative test.
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A Study of Complex Pressing Technology for Small Hard Metals Blank

WANG Shang-zhi;LIU Wen-li;MA Shi-xi
Rare Metals and Cemented Carbides | Vol., Issue 2, 1995 | pp. 17-20
Study is made on the use of complex pressing(die pressingfollowed by cold isostatic pressing) for small hard metals blank.Thebending strength of sintered product of complex pressed small blank isdistinctly increased and the service life is increased by more than 50y0.However, the use of complex pressing for small blank has a limitationdue to. dimension influence.
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Theoretical Model of Wire Diameter Determinator with Light Shading System

GUO Guo-zhou
Rare Metals and Cemented Carbides | Vol., Issue 2, 1995 | pp. 20-23
A-simple theoretical model of determinator for wire diameteris described.The wire to be determinated is placed in a parallel lightbeam,its diameter can be obtained by measuring the light shading capacity of the wire.This ins trument is for non-des tructiye inspection,which can work continuously during the production.The paper presentsthe idea for modification of circuit sys tern as to increase the measurement accuracy and explains theoritically the feasibility of this system.
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Determination of Trace Cerium in Alloy by Spectrophotometry

LUO Chong-qing;TAN Yu-li;FAN Jian
Rare Metals and Cemented Carbides | Vol., Issue 2, 1995 | pp. 24-27
A simple and rapid spectrophotometric method for the determination of trace cerium in alloy has been deyeloped. Cerium reactswith chlorphosphonazo-ms to form a blue complex at PH 2-3 .The complexexhibits a maximum absorption at 664urn with an apparent molar absorptivity of 4.76X 10'Lmol-loin-1.Beer's law is obeyed for 0-25pg of Ce in25ml of solution.The method bas been applied to the determination ofcerium in alloy magnesium.
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Determination of Hydrazine in Crystallization Residual liquor of Organic Amine Tungstate

GUO Xiu-shuang
Rare Metals and Cemented Carbides | Vol., Issue 2, 1995 | pp. 28-28
The content of hydrazine in crys talliza non residual liquo r'of organic amine tungstate is determined by iodimetry at PH￣8 and inpresence of sodium bicarbonate.During titration oxido--reduction reaction of iodine with hydrazine takes place and titration end is indicatedby the colour of excess iodine solutions.This method is simple,raliableand fas t with minimum determined content of 0 .20g/L.
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