Improvement and research have been made on solvent extraction (P204-TBPkerosene) for Sc recovery from the Ti white hydrolyzed pregnant solution. The optimumcomposition of TBP in extraction system is 6% by volume. 15-stage counterflow continuouswashing call effectively and easily separate Sc from Ti. The use of selective solution for Screfinning can remove the impurities (such as Ti, etc) with efficiency > 95%, which significantly simplify the process.

The paper introduces the use of W and Mo in alloy steel, describes the mechanism of ferro-tungsten-molybdenum smelting in three-phase AC working frequency plasmafurnace directly with mixed charge of W and Mo concentrates and gives the pilot experimentresults. The ferro-tungsten-molybdenum, obtained with Mo/W of 0. 05~0. 5 at recovery ofMo and W>90% respectively, is applicable to smelting ahoy steel. This new technologicalroute is open to utilization of the W-Mo intergrowth mineral resource.

Combining the compounding and the mixed methods, a new dry-wet methodhas been developed and used to prepare RE three primary colours phosphor. Related technological conditions have been investigated. Tested results and practice show that the newproduct has moderate and even particle size with stable properties, and meet the requirements of the key material for energy-saving lamp.

Specific volume --particle diameter relation has been studied for capacitor Tapowder. According to the relationship,derived from the approximate mathematical model,aspecific volume-particle diameter curve is obtained with a max of specific volume for eachtype of Ta powder. After introducing a correction factor into the curve,a real specific volumeof Ta powder can be estimated.

The influence of Y2O3(1. 1 % of ni mass) on the physical and chemical. properties of WC-8Ni cemented carbide and the sintering tenlperaturc xu,as investigated. It wasfound that addition of Y2O3 not only improved the properties, but decreased the sinteringtemperature. Using SEM the microstructure of cement f}d carbides of three temperatures wasanalysed and compared. The relation of the properties of the alloy to the sintering temperature. and the reasons for decreasing the sintering temperature were explained.

The paper describes the experiment and research on laser strengthing hardmetals products. Practice shows that the laser treatment of hard metals surface can significantly increase the product's bending strength and wear resistance.

How the WC grain size, composition of carbide and sintering atmospher influence the properties of the blank material for car ball head vertical milling cutter, the paperdesribes the experiment results with discussion and conclusions.

Study was made on expansion of Ta-W-Y alloy bar in the couse of moderatetemperature sintering. The paper analyses the source of expansion, relation of expansionrate to sintering temperature and W content,and put forward a 2-stage sintering method tosolve the bar's adhesion problem.

Our tungsten rod & wire production line was introduced from Toshiba Company, Japan. Due to various reasons, we often meet the quality problems of prodUcts, suchas breakage, cracks, etc. To solve the problems, analysis and experiment were made, andthe production line was upgraded with the following renovations:tungsten slugs are forgedunder different temperature according to the type of their grain sizel for annealing of tungsten rod after welding, only incompleted annealing is requiredl the machanic properties ofsemifinished and finished products are controlled by their yield rate in the stages of fabrication process.

The paper analyses the tensile strength of tungsten wires during processing vstheir guality, and gives suggestions for wire upgrading, such as optimize the annealing conditions, improve the processing technology to control the wire strength d& and so on.