The extraction of molybdenum (Ⅵ) from nitric acid solution by primary amineN1923 in octane has been investigated at 298K. The equilibrium expressions at lower and higherPH values were proposed respectively. The equilibrium constants were calculated.

Solvent extraction of Sc was investigated experimentally The extraction systemconsisted of P2O4, twroving agent, and kerosene. The results show that the extraction rates ofSc can reach up to 99. 7 %, the removing rates of Fe and Mn are 98. 1 % and 99. 3 % respectively,the stripping rates from organic phase with NaOH reach up to 99.6% with effective separationfrom Fe and Mn.

Study is made on the upgrading of Co from low-grade concentrate calcine leachateand its separation from impurities. The studied leachate is free of Fe and Cu, with Co contentonly about 1 g/L while the impurities such as Mg. an. Ni. Mn. St etc in it are about ten times asmuch as Cab. After absorption by absorbent and then processing by HCl at room temperature, thecontent of Co in Hcf solution is about 13 g/L, and Co in the effluent is less than 1 mg/L. Afterevaporating and concentration. Co could be upgraded to over 20 g/L in the enriched solution andseparated from Si. The total recovery of Co to rich Co solution could reach as much as 98. 7%.Then extracted by N235 to separate impuritys CoC12 could reach the technical-purity standard.

For possible application of the titanium based β-PbO2 electrode in tungstenhydrometallurgy industry, its electrochemical property in alkalinous sodium tungstate solution hasbeen studied.

This paper describes the distribution of In, Ga, Ge and Cd in oxygen pressure acidleaching process of Cu-Zn-Ph bulk flotation concentrate. The result shows that the raremetaishave been leached out and concentrated in varying degrees in intermediate products from recoveryof Cu and Zn. The paper also discusses metals recovery process.

Study is made on Ge recovery from H2SO4-leached supernatant (0. 02 ～0' 03 g/lGe), using 'H' kerosene and butyl octano TBP as extractant. Resljlts show that the said processfeatures lower reagent consumption and over 22% Ge content in concentrate.

The principle of ion plating has been analyzed in this paper, And a noveltechnology for ion plating of imitation gold Cu-Al-in alloy on the surface of NdFeB permanentmagnetism alloy has been studied. The reasonable technical conditions for obtaining homogeneousbeautiful coating layer with tiny crystal particles were as follows: workpiece bias voltage: 200 V,main arc current: 5 A 2 0. 25 A, optimum workpiece height: 120 mm, evaporation heating power:11 kW, PAr: 1. 33 Pa～0. 0133 Pa, time: 30 min.

Tde particles in Al matrix were prepared successfully from powders of Ti, B andAl by means of SHS technique. The effect of aluminium content and the temperature of synthesison the SHS process, phase comPOsition and microstructure of the reaction products have beenstudied. The mechanism involved in the synthesis of TiB2 in Al matrix has been discussed. Theresults show that TiB2 particles may form in Al matrix at temperatures even about 800 t owingto the exothermic reaction between Ti and Al POwders. The presence of Al may hinder thereaction between Ti and B powders. The size of TiB2 particles is 5. 0 to 0. 5 pm, according to theAl content of the system.

The anvil materials for hot upset applications are reviewed in the present paper,and an emphasis is put on processing parameters, the compositions and key properties of the highTungsten alloys for anvil application. The resultS show that the alloys have high red hardness, i.e.198HV at 500℃ and 168HV at 800t for W232 alloys. Therefore, W253 and W232 alloys aresuitable for fabricating air exhaust valve, while W153 and W132 for air inlet valve. Tear lifespanis 10 ～ 30 times longer than that of Cu-W80, and the rate of finished products increases from58 % to 98 %.

For systematic analysis of the influence of RE on microstructure and physicalproperties of AlMg3W alloy, the metallographic inspections and X-ray diffractions have beenundertaken, and contrast tests have been made with respect to the mechanics property,wearability, welding property, thermal expansion property. The results show that AlMg3W alloywith 0. 05 % RE has the optimum property.