Review is made of the latest development of β-Sialon, Sialon-mullite, mullite and mullite-zirconia. ceramic materials synthesized from coal ash. And the synthesis mechanism of Sialon is analyzed.

Multi-principal element high-entropy alloy is introduced from its definition, properties and application. And the latest development of high-entropy alloy is emphatically reviewed, and its development orientation is pointed out.

The commercial test of Cu-Co alloy crushing was carried out by high-pressure water atomization. The results show that the prepared Cu-Co alloy powder has a small and uniform particle size, quite fit for the subsequent leaching process. Technical principle and equipment system of the above process are introduced,their characteristics are analyzed. Suggestions are made to further improve and perfect the process.

Principle and advantages of microwave heating are introduced,and the present application of microwave heating in tungsten industry is emphatically reviewed.

Microwave technical characteristics and microwave equipment working principle are briefly described. The relationship was studied between the technical conditions of microwave heating drying and the water content and particle size of niobium hydroxide. The economy of microwave drying process is analyzed. The process is used in niobium hydroxide drying with the effects of clean production, energy saving and environmental protection.

The content of Ca and Mg in potassium fluotantalate was determined by ICP-AES. After the conditions are determined of analytical spectral lines, detection limit, determination limit, bulk concentration and dissolving acidity,the Ca and Mg recovery of standard addition is 100.58%-102.5% ,and RSD value is 0.74%-10. 02% for the measured Ca and Mg content. The method is reliable, simple and fast to operate with high precision.

Description is made of the characteristics of laser hardening technology, including the processes of laser phase transformation hardening, laser melting hardening and laser impact hardening. And the present application of laser hardening technology is reviewed.

湖南稀土金属材料研究院始建于1958年，为国有独资科技型企业，是我国最早从事稀土材料应用研究与开发的单位，是军工稀土新材料研制开发的配套单位。该院已通过军品科研生产许可认证和ISO9001中国质量认证。

Description is made of the property of carbonaceous and sdiceous vanadmm staale and test resmts on processes of direct acid leaching and blank oxidization and roasting acid leaching for vanadium extraction from the ROM ore. Comparison of technical and economic index shows that the use o{ ROM ore direct acid leaching resulted in 20.1~ less investment,1.85 ~ higher FIRR on investment （pre-income tax） and 0.28 year shorter investment return period, yet 4.8% more specific processing cost for per ton of ROM ore. This process is characterized by short process flowsheet, simple and sophisticated process,energy-saving and en- vironmentally friendly and easy for commercial production,It can he used for reference and popularized for similar vanadium mineral processing.

Ammonia in APT crystal mother liquor was removed by adding sodium tungstate with sodium hydroxide and magnesium salts. The results show that the content of ammonia in the treated solution can be removed down to 0. 042 g/L up to 98.88% removal rate. The resultant sodium tungstate solution was diluted 10 times before prepared as ion exchange feed solution, the content of ammonia in the raffinate is less than 0. 000 5 % ,which can meet China national discharge standard.