Digestion tests are made on calcined mica with different F content. The results show that Li2O di gestion can reach 97 % -98 % with proper process when F content in calcined mica controlled below 2.5%.

Based on the sis is made methods complex an on the proc d effects of present production in the existing ess,pollution source and pollution SO2 and the dust. In the paper ar Mo metallurgical enterprises, summary and analycontrol, focusing on the e presented the existing Mo metallurgical enterprises and the related solutions. description of the control environment problems incomplex Mo metallurgical enterprises and the related solutions.

Study is made of vanadium removal from ammonium molybdate solution by ion exchange, focusing on the use of DP-1 resin for the said purpose. With DP-1 resin at pHi7.18 and contact time 30 min while the volume of treated solution is nine times more than that of the resin, vanadium removal is up to 99.84% and vanadium is reduced from 0. 638 g/L down to 0. 007 g/L. The stripping results are excellent with 2 mol/L NaOH as strippant. The resin features stable reusability when transformed by HCl.

Research is made on addition of rare earth（La,Ce and Y） during foam aluminum preparation so as to improve the compressive strength of foam aluminum. The results show that the compressive strength is best when rare earth-Y is added in this experiment. And the following optimum process conditions are obtained through orthogonal experiment ：temperature 700 ℃, Y dosage 0.2 mass %, stirring time 2 min and heat preservation time 2 min.

In this paper,study is made of the effects of pH value on co-precipitation of nano-size ITO powder,and characterization analysis is made by TEM and XRD. The results show that co-precipitation is done at pH value 2.8-4.1. When pH= 9 at precipitation end, the powder is characterized by smallest grain size, largest specific surface area, lowest agglomeration factor, uniform particle distribution, good single dispersion property without agglomeration. When pH value is too low, the incomplete precipitation occurs, resulting in material loss. However, when pH is too high, the grain size becomes larger,affecting specific surface area and other relevant properties.

Ultra-fine Al（OH）3 powder is prepared by homogenous precipitation. Study is made on the influence of different addictives on the powder morphology. The morphology of powder is analyzed through scan electron microscope. The results show that additives strongly influence the morphology of powders obtained by homogenous precipitation. The morphology of powders is changed with the type of additives. The addition of PVP and NaH2PO4 fail to form regular morphology; while the addition of PVA results in sheet structure; the particle is dispersive yet irregular with the addition of SDS. Regular spherical particles are obtained with the addition of X.

The high-temperature anti-oxidation Ge-added Si-Cr-Fe coating on the niobium alloy substrate is prepared by fused slurry method. The surface, section morphology, structure, component and phase distribution of the coating before and after oxidization is analyzed,and comparison is made between the morphology,structure and anti-oxidization property of 2-step coating and 1-step coating, The results indicate that the coating consists of tow layers. The out layer, the main body of the coating, is the complex phase of （Cr,Fe,Ge,Nb）Si2. The inner layer which is a diffusion transition layer consists of the dense phases of （Cr,Fe,Ge,Nb）Si2 and microdosis（Cr,Fe,Ge,Nb）5Si3. The interfaces among the body of coating,the diffusion transition layer and the substrate are smooth, dense with wider transition layer which can effectively stop the extension of cracks to improve high-temperature anti-oxidization property.

Study is made of the preparation of niobium suboxide by Nb reduction. Niobium Suboxide powder is prepared by agate grinding and mixing-reduction roasting-screening. The process were further optimized through orthogonal experiments and variance analysis. Physical and microscopic examination of the product is made through XRD and SEM. Niobium suboxide anode is prepared with method similar to that for tantalum electrolytic capacitor and its electric property is investigated by electrolytic capacitor anode testing. The results show that niobium suboxide prepared by Nb reduction of Nb2O5 has good electric property with specific capacity 69 500 μF · V/g,loss 11.25 %, leakage current （value of K） ≤ 1.8 × 10.4μA/（μF · V）, which are better than those of the Chinese national standard （GB/T 3136-- 1995） for FTal 6-- 300 tantalum powder for capacitor.

Comparative study is made of YSZ powder for SOFC electrolyte prepared with acetic acid citric acid in order to find a low-cost and high-performance process to prepare YSZ. The test results are analyzed by TG/DTA, XRD, and SEM and optimized preparation process is obtained. Analysis and discussion is made on the test results.

In view of the importance of anode oxide film in Ta electrolytic capacitor,comparative analysis is made of the influence of oxygen content in Ta anode sheet. Related influence mechanism is described. Resuits show that the oxygen content is dependant on the impurity oxygen content of the in Ta powder and is related to the anode sheet compaction, sintering and property. Impurity oxygen is unfavorable for the formation of anode oxide film and is one of the main factors for higher leakage current of the capacitor.