Study on Recovery of RE from Elution Deposit Ore in Weathering Crust of Biotite Granite

HE Lun-yan;ZHOU Xin-mu;HE Yi;WANG Shi-nan

Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 1-6

Study was made on recovery of RE from the elution deposit ore in weatheringcrust of biotite granite. The raw material is leached by a selected strong-acid ammonium salt(ammonium sulfate .ammonium chloride and ammonium nitrate, etc. ). The extraction ratereached more than 95%. Leached solution of RE is controlled for PH by aqua ammonia, purified with ammonium sulfide, and precipitated with oxalate or ammonium bicarbonate to obtain pure oxide of RE.

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Study on the Solvent Extractive Separation of Tungsten and Molybdanum from Sodium Tungstate Solution Containing High Molybdanum

GU Hang;WANG Jian-ling;WANG Ji-min;LI Xing-ying

Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 7-11

Without adding complex reagents, the solvent extractive separation of tungsten and molybdamun by N263 in suiiuric acid system has been studied' The effect of manyfactors in the process of mono-step separation has been investigated, and the perfect conditions of separation has been found. Results of the multi-steps show that ratio of molybdamim to tungsten trioxide in stripping liquid (ammonium tungstate) is not more than 0.01percent and attained the quality demand for separation.

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Factors Affecting the Oxidation Roast of Iran's Mo Concentrate

HE Shu-rong

Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 11-15

Oxidation roast test of iran's Mo concentrate in a rotary tube electric furnacehas revealed that physical and chemical properties of the concentrate has a great effect on itsoxidation roast performance, and in order to obtain satisfactory cinder from this type concentrate proper measures must be taken during roasting.

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Improvement of Te Recovery from Te-containing Residues

NIE Bao-sheng

Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 15-17

Experiments and comparision analyses were made on improved technology asto grade and one-pass recovery of Te. Results indicate that addition of CaCl2: solution atleaching and purification stages can greatly increase the Te grade and its one-pass recovery.

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The Influence of Doping with Cobalt and Nickel on Gas-sensing Properties of Bismuth Molybdate

HU Xing-ding;ZHANG Wen-pu

Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 17-21

Bismuth molybdate gas sensor materials doped with cobalt and nickel wereprepared respectively' Sintered gas sensors made from bismuth molybdate doped with cobalthave a high sensitivity and selectivity to reducing gases such as ethanol, and insensitivity tobutane and carbon monoxide. The phase composition and structure of these gas sensor materials were investigated by XRD and XPS techniques. The substitutional solid solution formedby cobalt oxide and bismuth molybdate will improve the conductivity and sensitivity of thisgas sensor to reducing gases.

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Effect of Rare Earths on the Microstructure and the Performance of WC-8Co Cemented Carbides

LIANG Fu-qi;HAO Jian-min;HU Ming;YANG Rui;LIU Shou-rong

Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 22-26

The optimizing mechanism for the microstructure and the performance of WC8Co cemented carbides by adding ultrafine mixed powder of rare earths oxidate has been explored. The results show that, the mixed powder of rare earths oxidate can not only fine the WC grain, eliminate the uncontinuous growth WC grain and raise the fee Co-phase content inalloy, but also can evidently raise the macro pressure stress on alloy surface.

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Study on Improvement of Dopped W Wire Production

LIU Guang-yao

Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 26-29

Analyses of the defect of the dopped W wires made by traditional technologywas carried out. Technical measures were taken to optimize the process. It has made thedopped W wires of good high temperature anti-sagging. good workability and coiling properties,which are needful for anti-vibration coiled-coil filament.

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Effects of Intermediate Annealing on Working Quality of W25Re Alloy Wire

TAN Qiang;CHEN De-mao;MENG Xian-zhong

Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 30-33

Stuty was made on effects of annealing variable (temperature, speed, etc. ) ontensile strength,structure and rate of finished products of W25Re alloy wire. Results showthat the use of intermediate annealing can improve the working quality of the wire, increasethe rate of finished products to 60% from alloy blank to D 0.1mm wire, and decrease thewire failure frequency(not more than 3).

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Grasp Massagement, Strengthen Enterprise's Life Force

ZHANG Tong-gui

Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 34-37

Taking the institute as an example, for increasing enterprise's effect, thepaper discusses strengthening enterprise management under the following headings: personnel administration, product quality, new product development, opreation cost and market.Practice indicates that the institute has made a successful reform of above mentioned pointswith a great economic benefit for several succession years.

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Developing Technical Renovation, Strengthening Enterprise's Competitive Strength

LI Du

Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 38-42

This presentation introduces the connotation of technical renovation, analyses its current status in Hunan's nonferrous metals enterprises, and makes a suggestion inthis field for increasing enterprise's competitive strength.

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