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.

Addition of rare earth into platinum and its alloys, not only can efficiently fine the grain, but also improve the stability of structure and increase strength and plasticity. In this paper, the function and application of rare earth to the platinum and its alloys are described in detail on this hands, the prospects of their application are pointed out.

丹麦尼罗（NIRO）公司生产的移动式小喷雾干燥器HI-TEC型适合试验性生产和中小规模工厂干燥粉末制粒用。当需要细粒粉时,在干燥室内设回转喷嘴（rotary ato-mizer,见图1）。假若需要粗,而且流动性较好的粒料时。

1 铼的提取 铼在地壳中的含量很少,仅为1×10^-7%,居第80位属最稀有元素。它没有单独矿石,年生于某些钼、铜等矿物中,以辉钼矿居多,含量约0.0001%～0.3%。铼的综合回收主要以处理钼精矿、铜精矿的烟尘、母液、洗涤液和炼渣等为原料。提取方法有氧化焙烧-沉铼法、萃取法、离子交换法。

本文在“渐进前沿模型”的基础上,考虑了稀土离子通过乳珠外围扩散层和膜相的扩散阻力以及膜破损对传质过程的影响,建立和推导了乳状液膜提取稀土的传质模型。实验验证的结果表明,此模型与实验值较好地吻合。此模型数学关系简单,引入参数较少,实用性较强。