It is very difficult to recycle and reuse Waelz clinker because of its fine particle size,high residual coke breeze,large hardness and complex compositions of low content of value metals. Based on the differences in magnetism and specific gravity between iron rich part and carbon rich part, some processes have been developed to separate part of coke breeze by hydraulic washing, to separate iron rich part from coke breeze by crushing-magnetic separation, to produce iron powder by ball milling-magnetic separation, and to produce silver-iron ore by gravity separation for the recovery of Ag, Cu and In from clinker by physical separation and for＇proper comprehensive reuse of Waelz waste clinker in Zn hydrometallurgical industry.

The paper review the latest development of spectrophotometric determination of zirconium and hafnium. Description is made of various developers and conditions under which developing reactions take place,as well as the limit of detection,the interferences and the scope of determination of the corresponding methods.

The characteristics of wulfenite and latest development of wulfenite extractive metallurgy were reviewed. Na2 S-leaching process, microbe-leaching process and mechanochemistry directly leaching process were introduced and compared, the result showed that Mo leaching ratio could reach 99% by mechanochemistry directly leaching process for wulfenite, in which process energy consumption was the lowest, and least equipment was needed,the newly developed process was the best way to recover Mo from wulfenite.

The mechanism of the grain growth is analyzed. During the sintering of WC-Co powder, grain is grown in normal way and abnormally way. WC grain begins to grow at the early sintering. The measures to inhibit the WC grain growth are proposed.

This paper has summarized the latest development of advanced Nb-Cr- based composite material possibly to be used as ultra-high-temperature structural material. The chemical composition,preparation techniques,microstructure and mechanical property of this alloy have been reviewed. This kind of alloy has the advantages of low density, high hardness, good high- temperature resistance etc.

The paper describes the latest development of TiC/Fe composite materials both at home and abroad. Several preparation techniques are reviewed. The approach for performance improvement and application of the materials are predicted.

Brief analysis is made of tendency for the development of the forging equipment and its control system. The paper describes the powder forging, precision forging, isothermal forging techniques and their applications in the processing of steel-bonded cemented carbide,Nb-Ti high-temperature alloy steel,etc.

The paper describes the superior performance of rare earth shown in hot galvanization. It reviews rare earth development and application in hot galvanization industry as well the progress in the research on effect of rare earth on the coating, wearability and the rare-earth dosage. The tendency of RE future development in hot galvanization industry is pointed out.

Cu-1. 56Cr alloy has been prepared by gas-atomization, and the structure of the alloy aging at 500 ℃ at different time were observed. The TEM images show there were two meta-stable structures which were modulated structures at early stage of aging. The lattices were determined by the SAED pat- tern,the modulated structure Ⅰ was modulated based on the lattices of copper. The modulated structure Ⅱ was DO3 structure , the crystallographic relation between the modulated structure and matrix was N-W and probably the modulated structure Ⅱ was matrix of chrome. The precipitation sequence of Cu-1.56Cr alloys was：fcc Cu solution alloy modulated structure I→modulated structure Ⅱ→chrome. Two meta→stable structurs were metastable phase at the transformation from fcc structure to bcc.

The oxidation behavior of Nb-35Ti-6Al,Nb-15Ti-llAl and Nb-30Ti-15Al alloys is studied in air atmosphere at 900℃ and 1 000℃, and the high-temperature oxidation dynamic model of Nb-Ti-Al alloy is established. It is shown that the addition of Ti and Al can evidently decrease the oxidation rates of alloy, and both Nb-15Ti-llAl and Nb-30Ti-15Al（β＋δ） show superior oxidation resistance than Nb-35Ti-6Al（β） which may be attributed to the decreased solubility and diffusion of oxygen in δ phase.