The extraction behavior of tungsten and phosphorus in alkalescent solution(pH= 7.80 ～8.32) by CL N 1923 LEVEXTREL resin and the conditions for separating the trace phosphorus,arsenic,silicon from the tungsten in impure sodium tungstate solution were investigated.The results of static and dynamic experimental method showed that the resin may separate the trace amounts of phosphorus and silicon from the tungsten in impure sodium tungstate solution effectively.The content of phosphorus、arsenic and silicon in real industrial sodium tungstate solution was decreased to below 0.015,0.030,0.010 g.L -1 from 0.05～0.50,0.04～0.10,0.050～0.30 g.L -1 respectively,the removal rate of phosphorus,arsenic and silicon may get to 97.6%,81.6%,100%,the one pass recovery of high pure tungsten may reach 80%.

Bi Te ore is leached with HCl+NaClO 3 .Leached solution is reduced with Na 2SO 3 to obtain rough Te powder. Reduced solution is hydrolyzed to recover Bi. Rough Te powder goes through purification with 2 mol/L HCl to obtain >96% Te powder.

V_2O_5 is used as raw material,carbon black as reducing agent, the whole process flowsheet for VC was worked out. The obtained product is up to standard.

Various quenching processes have been done to the steel bonded carbide made by a new process before tempering. The tempered alloy was studied for its structure, wear's surface and wear property. The result shows that,the wearability of alloy relates to the dropping of hard phase. The structure of 1 150 ℃ quenched alloy is idealer. It has better wearability after tempering.roperty .Theresul

Fused salt electrolysis for preparation of RE Zn alloy has been studied.while zinc is used as cathode (stirred),RE 8%～zinc alloy is obtained at cathode current density of 3.37 A/cm 2, t 760～790 ℃, RE chloride concentration of 28%～32%

The Co slag obtained from scrap hard metal smelting with Na 2SO 4 was analysed by XRD. Results show that the Co in the slag is in the form of Co 9S 8. Analysis of Co 9S 8 by phase diagram shows its formation mechanism, and oxiding roasting method for the Co slag treatment was put forward. Results show that after oxiding roasting of the Co slag,the leaching rate of Co is more than 99%.

By taking La Co Ni triangle system and Nd Cu,Gd Cu binary system for examples,the steps and principles of preparing metallographic samples of rare earth alloys are introduced.The metallographic photoes of 5La 73Co 22Ni,6La 89Co 6Ni,25.6La 34Co 40 4Ni,Nd 69Cu,Gd 12Cu are given with structure analysis.

The paper describes the production design of foamed Ni,with discussion for product's quality improvement.

This paper introduces the wet process for extracting As 2O 3 from As containing material.It improves the quality of product and reduces the air pollution in comparison with fire method.

The paper reviews the comprehensive use of coal gangue in detail.Author highly appraises the new process for preparation of high early(strength) cement from coal gangue (researchers:Xie Zha ji,et al) as a effective method for use of coal gangue, and recommends that the researchers shall transfer the research results into production force as early as possible.