Investigation is made on the recovery of Mo and W from Mo stripping solution with D354 resin. >97% W and Mo is absorbed with D354 at pH=3 and contact time 40min. And the saturated absorbing capacity from W/Mo coadsorption can reach 0.238 mol/ml wet resin. The stripping results are excellent with 10% NaOH as strippant,the max concentration of WO 3 and Mo in the stripping solution can reach 100 g/l and 36 g/l respectively. The resin features stable reusability when regenerated with alkali NaClO and transformed by HCl.

Study is made of the genesis of the aggregate in WC powder. Results show that simple composition and stable properties of W oxide is a prerequisite for quality WC powder with uniform particle size and less aggregate. When normal blue W contains other phases,especially WO 2.72 , the aggregate is liable to form in W and WC powder. The increase of Fe in WC will result in distinct increase of aggregation of WC powder. Different processes will result in different aggregation of W and WC powders from the same raw material. The aggregation is unavoidable when normal blue W is used to produce fine W powder by conventional hydrogen reduction. But the aggregate can be disaggregated in the following operation. If the carburization temperature is too high,the previously loosened aggregate will be bonded more closely and grown, resulting in partial increase of WC Co particle size.

The phase changes of MoSi 2 in ball milling process have been measured by X ray. The effects of different ball to powder weight ratio and milling medium on mechanical alloying process of MoSi 2 have been investigated. It was found that it's better to adopt the process with heavy cemented carbide medium and ball to powder weight ratio 20∶1.

Study is made of the influence of the process of cold pressing and roughing followed by rolling ,of deformation degree and annealing on the structure and properties of Ta slabs.Results show that during cold pressing, the force is only applied at one direction. The metal flows in the longitudinal direction of the columnar grain in the cast ingot, so that the columnar grain is elongated along the deformation direction,without distince grain refinement. The lower the recrystallization temperature, the smaller is the grain size. And the larger the rolling deformation degree,the larger the tensile strength and the lower the elongation is. After recrystallization and annealing, the hardness is nearly all the same, but there is distinct anisotropy. At 45° direction, there is low strength but the elongation is obviously increased. The anisotropy results in serious earing and heavy metal loss during deel drawing of Ta slab.

Based on the physical model and mathematical model,the simulation of magnetic field in the metallurgical furnace is reviewed. Through comparison and analysis, it is indicated that the simulation should be based on the magnetic field generated by the current and also the influence of the ferromagnetic shield.

Investigation is made on the cause for crack initiation and way for the crack removal in the compact inner holes of YGR7Z cemented carbide drawing dies. It is indicated the said crack is due to too small shrinkage ratio of the compacting die. The test of single compact weight decrease proved that when the shrinkage ratio of the compacting die is increased to over 1.22 , there is no more crack initiated in the compact inner hole.

Description is made if the selection of the process flowsheet and design (incl investment comparison);the roasting of jarosite slag as well as the extraction of leachate,etc.From the industrial practice,it is shown that the design features correct flowsheet and technical concept, rational selection of equipment and assures top class In ingot product.

Description is made of the structures layout and features of tunnel type W powder reduction furnace designed and made by CREMER GmbH in Germary.

The principal and technology of diamond CVD, structure and properties of CVD film, its application prospect and market all are presented with focus on research of diamond CVD hard metals.

The paper overviwed the influence of the iron and aluminum impurities in beryllium in various forms on properties of beryllium materials, and pointed out that the formation of AlFeBe 4 with iron and aluminum by specific high temperature ageing heat treatment can improve the properties of beryllium. It was shown that certain ratio of iron and aluminum is a necessary condition to form AlFeBe 4. Description is made of the preparation of Be raw meterial conforming to specific Fe/Al ratio can be produced by selecting beryllium pearls or controlling acid concentration.