An oscillopolarographic method for the rapid determination of trace germanium in the medium of gallic acid-V(Ⅳ)-EDTA was presented.The peak potential was at-0.60 V,the linear range of the determination was 5×10^-8～2×10^-6 g/L,and the detection limit was 4×10^-9 g/L.The method is directly used for the rapid determination of trace germanium in zinc electrolyte solution with satisfactory results.

Soluble silicate is dissolved in hot water from the trial sample,then hydrofluoric acid is added to dissolve insoluble silicate.At pH=1.5～2.0,silicate ion and ammonium molybdate becomes the yellow silicon-molybdenum heteropoly acid and is reduced into silico-molybdenum blue by the reductant.The resultant material shows maximum absorption peak at 810 nm,the apparent mol light absorption coefficient is 1.2×10~4 L/(mol·cm ),content ranges 0～100 μg/50 ml, as conforms to Beer's Law.The method can be directly used for total silicon determination from commercial and reagent chloride potassium.

Description is made of several feasible technologies,process flowsheet and main technical parameters for the treatment of APT crystal parent solution.

This paper reviews the latest research on W-Ni-Fe,W-Ni-Cu,W-Cu high-density tungsten alloys.It introduces some key techniques for tungsten alloys,and points out research directions of tungsten alloy materials.

In this paper is described warm compaction and study of its application in the fabrication of P/M Ti alloy,as well as its potential application.The importance of lubricant design in Ti powder warm compaction was stressed.

In the paper is reviewed the study of strength and structure of WC-Co hard alloy. It indicated that WC-Co hard alloy is characteristic of particle compound reinforcing material,based on which investigation is made into the microstructure and preparation technology of the said alloy.

Description is made of the latest development of K_2TaF_7 process and equipment in China,focusing on the study of the quality relationship between K_2TaF_7 and capacitor-grade Ta powder.Comparison is made of the relevant techno-economic norms.Discussion is made on the existing technical problems in respect of process and equipment.

Analysis is made of the behavior and impact of F in Be ore on commercial Be oxide smelting.Measures are proposed to reduce and eliminate the negative impacts so as to reduce the smelting cost of the commercial Be oxide and improve recovery and reduce the environmental pollution.

In the paper are reviewed the main methods and their principles,applied technological conditions and comprehensive recovery effects for cemented carbide scraps both at home and abroad.It is pointed out that the combinations of physical process and chemical metallurgy,mechanical grinding and high-temperature treatment have good comprehensive recovery effects for cemented carbide scraps as is a main orientation for study.

This article describes grain refinement of γ-TiAl-based composites and their improved hot-workability.Discussion is made on the microstructure,compressive and extensile properties and isothermal casting defrormation of the hot-worked material.