Recovery of molybdenum from copper and molybdenum middlings has been studied.The main steps are as follows:NaOH hi-pressure oxygen digestion to enable Mo to enter the solution in the form of sodium molybdate with Cu remaining in the residues,which can be used as raw matcrial for Cu recovery.Mo is recovered by extraction from Mo-containrng solution.It is shown that,under given conditions,the recovery of molybdenum and copper is 95.6% and 99% respectively.

Study is made of the process extraction of sulfuric acid from TiO2 hydrolysis waste acid with tri-isoctylamine as extractant and H2O as stripping reagent.Investgation is made on the impaction of extractant concentration,phase modifier concentration,phase ratio and temperature on the extraction and stripping.Simulation test is made.The results showed that under given condition,the H2SO4 recovery can reach 91.8% and acid concentration in the product is 119.73 g/L.

Study is made of Ga recovery process from ISP or fuming furnace granulation slag.Ga is extracted from H2SO4 medium with N1923 as extractant by a unique leaching technology of enriched H2SO4 at constant temperature and elimination of Si impact on liquid-solid separation.The enriched product with Ga assaying 2.82% is obtained.

Study is made of the vibrating ball miling for ultra-fine WC powder preparation.Coarse,medium and fine WC powders are used for tests at different ball percentage and milling time.The results showed that longer ball milling time cam result in ultra-fine WC powder with FSSS particale size<0.5 μm,while larger ball percentage and longer milling tine can make the particle size smaller yet without any influence on the particle size distribution.The milled powder size distribution is related to that of the primary powder.The longer milling time will result in smaller grain size and larger stress.

Description is made of a new technique for hard alloy production by a new process of W powder directly blending with carbon without carbonization.Through preliminary exploration,hard alloys with ideal property are obtained.The author believes that this process is characterized by low operating cost,good product quality,being easy to popularize.It is worthwhile to be further improved and made perfect.

Analysis is made of the main factors affecting the service life of W twisted spiral for deposited KinescopeIts relationship is also discussed

Brief description is made of the new process of serial column absorption and stripping for W ion exchange.It is pointed out that under the same condition,the new process will result in about 100mg/g(dry resin) more W absorption (as WO3) and 80 g/L more WO3 in the stripped peak solution than that by the original process with lower impurity element content in the solution,resulting in better-quality APT. APT yield increased about 15 g/L than the original process as well as～10% reduction of ammonium chloride consumption,indicating distinct economic returns from the new process.

The research achievement in the recent 20 years and the status quo on the recrystallization temperature of doped molybdenum wire are analyzed.The doping methods and the doping elements are mainly introduced and the necessity of the research on its mechanism is put forward

The paper has reviewed Nanorneter TiO2 preparation methods and its advantages and disadvantages are compared.The paper describes its current applications in the fields of light catalyst,environmental protection,cosmetics and wave absorption mat erials.It also pointed out the problems to be solved in the course of Nanometer TiO2 preparation.

This paper presents the latest results of developrnent of amorphous and nanocrystalline MmNi4.2Al0.8 aolloys and their hydrogen storage properties.