In view of indium enrichment in zinc hydrometallurgy, the paper summarises the main forms of indium existing in the semifinished products of Zn calcine, Zn leach residue, zinc volatile kiln slag etc. Based on the analysis of relevant reaction process and effect, the paper describes some technologic measures for indium recovery.

The latest development of microwave application in rare and noble metal metallurgy is reviewed, and description is made of the microwave ore pretreatment and microwave accelerating of Mo concentrate leaching, microwave carbothermic preparation, microwave plasma preparation, microwave sintering and calcination,the use of microwave for preparation of W/Mo-bearing chemicals.

In view of upstream damming widely used in China metallurgical mines for tailings dam construction, description is made of the cause of tailing formation as well as its special physical and mechanical properties. Analysis is made of the effect of tailing discharge method on the depositing law of tailings dam and the dam structure as well as the effect of tailing discharge concentration/flow velocity/flow capacity/ discharge place on the formation of depositional dam. It is pointed out that during design of upstream tailing damming, the relevant factors should be fully taken into account so as to ensure a well-graded accumulation. And the proper concretion of depositional dam body within a short time is a prerequisite for a stable dam by upstream damming with tailings. The shear strength of depositional body can be improved only by proper arrangement of seepage drainage facility and accelerating dewatering concretion of the depositional body. Two examples are given.

In this paper,the latest development of silicon carbide （SIC） particle reinforced aluminum matrix composites was introduced,focusing on the main preparation technology for SiCp/Al matrix composites. The future development of the technology is prospected.

The paper summarized the conventional processes for producing zirconium metal, including metallothermic reduction, dehydrogenization and electrolytic process,which have the disadvantages of high cost, serious pollution and complicated operation. It is pointed out that direct electro-deoxidation, a new process for preparing single metal and alloy, is characterized by low cost, less energy consumption,less pollution and simple process. It will most probably replace the given conventional processes for zirconium metal production.

Deep separation of tungsten from molybdate solution is a problem in the field of metallurgy.According to the different properties between tungsten compound and molybdenum compound,using the theory and method of molecular design,a new reagent is used to enlarge the differences between tungsten compound and molybdenum compound.A new adsorbent is used to remove tungsten from molybdate solution.After removing tungsten,the ammonium molybdate contained WO3<0.05% is obtained by ion exchange and crystallization fro...

Study is made of the phase constitution of La2O3-H3BO3-C system during high-temperature sintering in argon atmosphere by means of XRD and TG-DTA.The results show that dehydration of H3BO3 occurs at 82~390 ℃;in 3 steps as follows:first formation of HBO2 at 82~153 ℃,then formation of H2B4O7 in 153~222 ℃,and finally formation of B2O3 in 287~390 ℃.At 836~1 400 ℃,La2O3 and B2O3 react with C to form LaB3O6 and LaBO3;at 1 450 ℃,La2O3,B2O3 and C react into LaBO3 and B4C.At this time,LaBO3 phase is predominant.The c...

TiC/Ni-Al ceramic particle reinforced high-temperature abrasion-resistant composite coating was prepared by laser synthesis on the stainless steel substrate of 1Cr18Ni9Ti by laser deposition using Ni-Cr-Al-Co-Mo-W-Nb-Ti-C+TiC powder mixture.The sample was kept 50 hours at 1 000 ℃.Microstructures and phase composition and micro-hardness of the coatings before and after high-temperature aging were examined by OM,SEM,EDS and Vicker micro-hardness tester.Under the experimental condition,no cracks,holes or other...

In this paper,systematic study is made of the high-temperature chemical reaction and phase composition of B4C and Al through XRD and differential thermal analysis.The results showed that at 0~1 500 ℃,reaction between B4C and Al resulted in Al3BC,AlB2,Al4C3 and AlB12C2 in 3 steps as follows:formation of Al3BC,AlB2 at 625~690 ℃;formation of Al4C3 at 1 150~1 185 ℃ and the formation of AlB12C2 at 1 320~1 350 ℃.The phase composition of B4C/Al composites fabricated by pressureless infiltration was analyzed,and th...