According to the property of LiCoO 2 in Li-ion secondary battery anode wastes of Al Co film,dissolution reaction of LiCoO 2 in a system of H 2SO 4 and H 2O 2 was put forward: 2LiCoO 2+3H 2SO 4+H 2O 2→Li 2SO 4+2CoSO 4+4H 2O+O 2↑ A simple process for recycling cobalt and aluminum was determined,including alkali leaching of wastes,acid dissolution of slag,purification of cobalt containing solution and precipitation of cobalt.The recovery of cobalt reaches 95.75%.Aluminum in alkali leaching solution was neutralized with H 2SO 4 and the product Al(OH) 3with a chemical purity was obtained,the recycling rate is 94.84%.The profit of 45600.6 RMB Yuan can be obtained in treating l ton waste by the technology.

The valent electron structute of (Ti、W)(C、N)solid solution has been analyzed according to the classical electron theory of solid and molecule.The result shows that the covalent electron number n A in the strongest bond of (Ti、W)(C、N)solid solution decreases with the increase of W or N.Some properties of (Ti、W)(C、N)has been analyzed based on this result.

Study is made on the formation of me chanism of Ni based alloy aluminization,whichisthonght to be made up of four steps to be controlled mostly by solid Phase diffusion.The diffusion speed is mainly depended on the aluminization temperature,then aluminization time.In addition,different aluminization temperature will result in different generation speed of phases with different activitation energy.

Analysis is made of the influence of alkali metals K and Na on the decomposition ratio of enriched Ta.The decomposition ratio can be improved from 92% to ≥99% by the adoption of precipitation conversion theory and proper addition of quartz powder as conversion agent without heating throughout the process.

A new kind of boriding agent has been adopted by boriding to GCr15 cold worked die in this test,the boriding process by this boriding agent were studied. The results showed that the boriding layer is even,and has less brittleness.By 890 ℃×6 h boriding process,this temperture is much lower than usual boriding temperture.A relatively ideal boriding layer can be obtained.

Analysis is made of the structure of WC based steel bonded molten and annealed cemented carbides and study was made of the influence of different carbon addition on the structure,The results showed that WC is not present in the structure of molten steel bonded cemented carbide.Proper increase of carbon or WC content and annealing will help improve the improper structures and WC reduction.

Comparision is made between the characteristics of recovered WC and conventional WC by clectronic probe detection.In view of perfect crystal lization,less defect in the crystal and sufficient compound carbon,cemented carbide superior to conventional WC is developed by process optimization to compensate for the high O 2 content and more inclusions in the recovered WC.

Description is made of the experiences in analyzing and using scientific information for the purpose of importing advanced foreign technologies and know-how and for promoting scientific research.Special emphasis was made on some high-tech information,especially from Russia,which may be very useful for metallurgical industry and materials science,as well as for environmental protection.

This paper mainly introduces the preparation of nanometer titanium dioxide.On the basis of summary and induction all methods are compared and their advantages.disadvantages and application scope are indicated.Meanwhile the development is also introduced.

Afrer arc melting,Nb Si alloy containing70%～85% Nb (atom fraction) is hydrided directly in arc melting chamber without activation to obtain fine Nb Si powder by pulverization.