In this paper,the author introduces the latest development and present status of steel-boned cemented carbide as a new wearing material in respect of its property and preparation technology. The tendency of future development is also reviewed.

Analysis is made of the characteristics of W hydrometallurgical operation. Systematic introduction is made of actual application of DCS in W hydrometallurgical operations with reference to the actual performance of the company.

Study is made of the property of absorption and extraction of germanium from acidic solution. The results show that the resin can effectively separate and enrich germanium from Ge-containing solution with H2SO4 （pH 2.0-2.5 ） medium and tartaric acid. The adsorbed germanium can be quantitatively eluted with NH4 F solution. The preliminary study proved that the absorption was an anion exchange process.

Study is made of the vanadium extraction from sodium tungstate solution leached out of the secondary tungsten resource. The test results show that the vanadium separation is over 99% and the direct recovery of tungsten〉98 %.

In view of more stringent requirement for better electric property of the relevant cathode material with the rapid development of the electron beam and ion beam technology, the paper describe the development of multiple RE boride（La0.55Ba0.45 ）B6 and （La0.4 Eu0.6 ）B6 cathode material. The testing results showed that its electric property is superior to that of LaB6 cathode material.

The cutting property of the coated cemented carbide with gradient structure and those without gradient structure was studied. The effect of cobalt on the cutting properties of graded cemented carbides was studied. The cutting tests demonstrate that the cutting property of the coated cemented carbide with gradient structure is much better than those without gradient structure. The cutting life of the former doubles that of the later at hB=0. 15 mm. Meanwhile,the larger cobalt content resulted in better cutting property.

Study is made of the nature of colloid palladium,the process of recovery of metal Pd from waste colloid palladium solution and also the effect of dye on the covering power and deep-coating power of the acid coppering solution experiment. The results showed that the recovery of palladium metal is up to 98.79% by heating for colloid dissolution. The ￡ potential of colloid palladium is directly affected by the additive,and the colloid stability is affected to some extent by Na2 SnO4 and vanillin. Analysis and comparison is done on the leveling and brightness of the coating as well as the covering power and deep coating power of the coating solution. The best dye for the tests is Methylene blue and Rhodamine B,with covering power 75.05 %, 68.42 % and deep-coating power 85 % and 88 % respectively.