Nb2O5 liquor is added into the Ta2O5 to form standard solution,then carry out chromatographic separating on paper after series of treatment with potassium fluotantalate sample parent solution.Finally directly take visual colorimetric analysis with sample by this method.The standard error and relative error and is 0.000 104% and 5.5%,respectively recovery is 97%～103%.It is applicable for the sample containing niobium 0.001～0.0x%.

Based on the review of development history of HIP technology and equipment,overall description is made of the improvement of the cast product quality and development of applications into the new materials such as high-speed speel,double-refined steel and super-double refined steel,high-performance ceramics.It is expected that the annual increase of HIP application will be 15%～20%in the next few years and its annual application in Al processing will be 25%.

The paper describes the study and improvement of Na reduction process of low-oxide Ta powder in D700mm large reactor.The results showed that the improved process has basically solved the problem of the control of process parameters and operation problem.The oxygen content in the resultant Ta powder can be controlled at about 1%.

Brief description is made of the present status of equipment for excess H2 high-pressure and pressure recovery from reduction furnace.It focused on the operating process and characteristics of the first large capacity H2 pressure recovery equipment from reduction furnace.The said equipment is characterized by large capacity,advanced technology,PLC fully-automatic operation control.Through operating practice,the main technical specificatioms have met the design requirement.

A combination of the SHS method and centrifugal process is investigated to produce a composite pipe by coating a ceramic liner on inner surface of common carbon steel pipe.The ceramic-lining pipes are characterized by simple process and equipment,high productivity,energy-saving performance and low cost,providing a new approach for the ceramic composite pipe production.The performances of SHS composite pipes depend on ceramic-liner,The paper summarizes the ways for the improvement of the performances of SHS composite pipes with respect of increasing densification and corrosive resistance,improving toughness,and decreasing crack ratio.

Description is made of the unique biological and physical properties and the application and development in medical industry of the scattered elements and compounds.

Description is made of the filler alloys for vacuum brazing of high-temperature r-TiAl alloy.The paper also presents the structure and mechanical properties of various brazed joints.Relative analysis and comparison is also made.

The paper analyzed the problems and their causes arising form the material in-storage quality inspection.Counter measures are presented for better management of material supply and improvement of material quality inspection.

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.