High-purity and homogeneous powders of CeB6 with nanometer size were prepared by combustion synthesis and subsequent acid- leaching. The effects of reactant ratio on the phase and morphology of the combustion product were discussed. The combustion product and leached product were analyzed by XRD, SEM and EDS. The results indicate that the combustion product consists of CeB6, MgO and Mg3B2O6. The combustion products are denser and less layered when the Mg content and KClO3 content increase. The content of CeB6 in the combustion product could be enhanced with increasing the excessive content of Mg. The purity of CeB6 is higher than 99.0% and its particles are smaller than 150nm.
Oxygen pressure acid leaching process was used to extract vanadium from vanadium slag (Panzhihua steelmaking plant of China). The single factor experiment was finished and the effects of temperature, leaching time, liquid to solid ratio, stirring speed, initial concentration of sulfuric acid, and were investigated on the leaching rate of vanadium, titanium and iron. The leachate and residue were characterized by ICP, XRF, XRD, SEM and EDX. The experiment results indicate when temperature is 140 °C, leaching time is 120 min, liquid to solid ratio is 20:1(ml:g), stirring speed is 500 rpm, initial acid concentration is 200 g/L, oxygen partial pressure is 0.5 MPa, and particle size is -0.075~+0.055 mm, leaching rate of vanadium is 97.89% and the content of vanadium in the residue is 0.586%. Leaching rate of titanium and iron is 12.78% and 94.45% respectively. Vanadium could be extracted effectively through the oxygen pressure acid leaching process.
For the lacks of magnesium-based desulfurizer in iron and steel industry, this paper investigated thermodynamics calculation of a new desulfurizer, MgO based desulphurizer. The results indicate that the beginning reaction temperature of light-burned dolomite and Al is 1314°C, the beginning reaction temperature of light-burned dolomite and Si is 1565°C, the beginning reaction temperature of MgO and Al is 1475°C, and the beginning reaction temperature of MgO and C is 1846°C. The reaction temperature between MgO and C is too high, so the carbon-thermal reduction can’t occur easier. When the hot iron temperature is 1400°C and the addition of alumnium and iron oxide is 12.77%, the reaction between MgO and C will be induced.
MoS2(AR) was used to analyze molybdenum transformation behavior in the pressure oxidation process of Chile molybdenite concentrate. Amount of NaNO3, temperature and sulphuric acid concentration were investigated on the total transform rate of Mo, leaching rate of Mo and absolute transform rate of Mo in residue. ICP, XRF, XRD were used to analyze the content and phase of elements in the molybdenite concentrate and residue. Single factor experiment results of indicate that when amount of NaNO3 is 1:4, temperature is 150°C,sulphuric acid concentration is 40g/L, oxygen partial pressure is 0.8MPa, liquid to solid ratio is 6:1(ml:g), reaction time is 120min and stirring speed is 500rpm, total transform rate of Mo is 97.95%, leaching rate of Mo is 18.48% and absolute transform rate of Mo in residue is 79.47%. Synthetical condition experiment results certified this process has the preferably reproducibility. Molybdenum could be recovered sufficiently through this method.
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