Additive aluminium oxide can inhibit impurities during alkaline leaching of tungsten-bearing raw materials. The inhibiting effects of products obtained during calcining aluminium hydroxide at different temperature as additives are studied. Structure and characters of different aluminium oxide are inverstigated by X-ray diffraction, electron microscope, thermal gravity analysis, size analysis. The Suppression of arsenic and silicon with aluminium oxide is discussed.

Some experiments were carried out to demonstrate the mass transfer model of extraction of rare earth by emulsion liquid membrane. It was shown the present model proposed in Part(Ⅰ) was not only in good agreement with the experiments, but also mathematically simple.

Studies of extraction equilibrium of erbium by di(2-ethylhexyl) phosphoric acid (D2EHPA)in sulphonated kerosene were made.The equation, for the extraction equilibrium and the [equilibrium constant were obtained.The extraction and stripping rates were measured using a constant interfacial area cell. The effects of the concentrations of Er3+ , H+. D2EHPA and the complex on the reaction rates were investigated and the rate expression of this reaction was obtained. The interfacial reaction model was proposed, which was identified by kinetic study and the measurement of interfacial tension

This paper is an investigation on NH4HCO3 precipitation methods-for crystalline rare earth carbonates from rare earth salts aqueous solution of ammonia.Traditionally, the obtainable precipitates are voluminous floccule. But the application of ageing seeds.saturation and saturation-seeds during precipitation can obtain filterable crystalline precipitates.

Ammonium chloride pressure leaching process of the calcine of lepidolite has been studied.The influences of temperature, time, .ratio of liquid to solid, the amount of NH4C1, etc. on the leaching recovery of lithium were investigated, and a mathematical model was established.The optimal conditions were chosed, and the verification experiments of the model showed the leaching recovery of 91% above could be reached. The model has practical significance for the choice of technologies control and predict of the process.

The new process for extraction of vanadium from carbon shale by roasting with NaCl-dilute acid leaching at atmospheric temperature-ionic exchange with 901 resin is studied. The recovery of V2O5 is up to 76.56%. Compared with the traditional process (water leach-vanadium precipitation with acid), the recovery of vanadium is increased by 25%, the operation cost per ton of vanadium is decreased by 25%, the quality of products is superior to that of the metallurgical grade 99% V2O5 standard (GB3283-87).

This paper deals in detail with ponder boronization process, boronized layer microstructure, phase structure and hardness of GW30 steel-bonded carbide. Effects of hard phase distribution in the alloy on boronization has been studied. Interaction of boride and WC coarse grain has been analysed by the university-made Black-and-White Photo Colouring Treater

阐述了电炉法生产高钛渣的基本原理及650kVA电炉的工艺设计计算。

A brief historic look back on the development of W-material industry before 80's is introduced, and the modern development of the industry is presented in detail. Since 1980, i. e. since China going to reforming and opening outward to the world, the Chinese W-material fabricating industry has developed quickly. Not only the industry capacity, the productivity and the assortment of W-material have got a significant development, but the product quality, the technique and the technology have been also increased to a new level. Nevertheless, there are still some problems in Chinese W-material industry, which are also discussed. The bright developing prospect of Chinese W-material in future is forecasted

Various metallurgical processing routes for ilmenite are systematically described. Their relative merits and demerits are explained. Some developing trends of ilmenite metallurgy are forecasted.