Advanced Materials Research Vol. 454

Abstract: The test for deep reduction and efficient separation of Lingyang iron ore from Linjiang that cannot be separated and utilized by any conventional mineral processing technology was conducted in the Laboratory, and the research results showed that iron from Lingyang iron ore was recovered effectively. In this paper, the effect of reduction temperature, time and coal content on reduction was analyzed, and the process of deep reduction and efficient magnetic separation was investigated. Furthermore, on such optimum conditions of deep reduction as reduction temperature 1275°C, time 50min, and coal content 40%, the reduction products were separated in the flowsheets of magnetic separation after fine grinding and the iron powder products with iron grade 79.58% and recovery 62.77% were obtained.

Abstract: Lizardite was as the research mineral in the paper, and the surface properties of lizardite and magnesium in the surface properties of the solution and the the natural flotability of lizardite were studied. The surface of lizardite easily produced unsaturated groups, and lizardite in the slurry can be generated in the Mg²⁺, MgOH⁺, H₃SiO₃^-, H₂SiO₄²-, H₆Si₂O₄^2- ions and acid molecules and Mg(OH)₂ precipitation, that result in the high PZC of lizardite, and the natural flotability of lizardite was poor in sodium oleate and DDA flotation system.

Abstract: The effect of four different kinds of coals on deep reduction and efficient separation of Lingyang iron ore from Linjiang was investigated in laboratory. And, tests for flowsheets of deep reduction and efficient separation with different coals as reductant were conducted. The result showed that coal had significant effect on the deep reduction and efficient separation. Iron powder was more superior in quality with an increase in the content of fixed carbon and reducing ash. And when washed coal with 12.02% of ash and 67.83% of fixed carbon was used as reduction agent in test, the iron powder with Fe grade of 88.09%, recovery of 88.32% and Metallization rate of 86.81% was obtained.

Abstract: Infra-red absorption spectrometry, X-ray diffraction observations and characterization tests based on silicon molybdenum colorimetric method were used to investigate the optimal pH value controlling the stability of the silicic acid form. The experiment process was done by using sodium silicate as raw material. The results showed that the solution of silicate influenced the polymerization. The active silicic acid solution with a certain degree of polymerization was obtained by controlling the pH values.

Abstract: In this paper, the conventional physical separation method such as flotation, gravity separation, magnetic separation, alkaline leaching and sulfuric acid leaching were studied. The effects of grinding fineness, amount of agent, magnetic intensity, roasting temperature, roasting time, the leaching agent and leaching time on the leaching of zinc were investigated, respectively. The results show that the leaching rate of zinc is below 50% in the conventional alkaline leaching, and the leaching rate of zinc is below 85% and the leaching rate of iron is above 35% in sulfuric acid leaching. Compared with XRD pattern of the raw ore, the different diffraction peaks of smithsonite is off in alkaline leaching products. In sulfuric acid leaching, the different diffraction peaks of smithsonite are off in the leaching products when sulfuric acid concentration is less than 60 g/L. After 60 g/L, the different diffraction peaks of smithsonite and siderite are off in the leaching products.

Abstract: The test of low grade Mo ore preconcentration index according to different separation threshold value was studied in this article. The results indicated that preconcentration index varies with the block of feeded material. Under the same test conditions ,the beneficiation index of -100+60mm size class particle was better than the other grain-sized particles and too large or too small particles all can affect the preconcentration index adversely.

Abstract: Depressants used in flotation can inhibit floatable gangue minerals to improve concentrate grade. In this paper, four different commonly used depressants were adopted in order to investigate the effect of depressants on chalcopyrite index and to investigate their inhibition effects on chalcopyrite flotation.The experimental results indicate that, in the flotation system of natural pH of pulp, mixed reagent of xanthate and aerofloat, sodium hexametaphosphate has the best effect on chalcopyrite separation, and the dosage range is 1.5-1.5kg/t, it can improve the concentrate recovery as well as concentrate grade. In the range of 0.5-2.5kg/t, sodium silicate can improve the concentrate grade and concentrate recovery, but the amplitude is small. CMC can improve the concentrate grade while lower the concentrate recovery. The effects of dextrin on concentrate grade and concentrate recovery is not so obvious.

Abstract: The main element of a ores are molybdenum and copper, which content is 0.056% and 0.16%.The main mental minerals are molybdenum, chalcopyrite and so on, and gangue minerals are mainly quartz, striped feldspar, calcite, et al. The disseminated size of Cu and Mo minerals is fine. The experiment index of concentrate grade of Mo is 45.17% including Cu 0.78%,the recovery of Mo is 78.24%, the concentrate grade of Cu is 13.30%,including Mo 0.03%, the recovery of Cu is 87.18% was got on the condition on the size of the first and the second grinding is -0.074μm 70%,-0.046μm 80%,using lime,sodium silicate as modifier, using butylamine black agent and kerosene as collector in the mix-flotation, using lime, sodium silicate and SK as the modifier,using kerosene as collector is In the separation flowsheet of Cu and Mo by using the flowsheet of mix-flotation of Cu and Mo, mixed concentrate regrinding, the separation flowsheet of Cu and Mo

Abstract: Using fly ash, cement, lime, gypsum as main raw material, CaCl₂, Na₂SO₄ and NaCl as activating agent, using steam curing method, the strength of ceramsite as main indicator, by orthogonal experiment to determine the best proportion of raw material, discussing the release process of trace metals element of ceramsite. Through contrast test with the blank group, commodity ceramsite group，homemade common ceramsite group, only adding Ni²⁺ group and slow-release Ni²⁺ ceramsite group in the microbial reactor can obtain: the removal rate of COD is 66.84%, 74.95% ,80.63%, 82.63% and 91.79% respectively, removal rate of adding modification ceramsite is the peak, 24.95% higher than blank group, 16.84% higher than adding Ni²⁺ group. Slow-release ceramsite can significantly increase the activity of activated sludge, comparing with other ceramsite and adding trace metal element directly, which has more superior process performance.

Abstract: The main useful mineral in a magnesite ore of liaoning province is magnesite, the main gangue minerals are dolomite, pencil stone, quartz and so on. The content of MgO is 93.80%, the content of the main impurity SiO2 is 1.24%. The indexs of experiment of contents of SiO2 0.13%, content of MgO 97.17% in concentrate, yield of concentrate being 71.66% is got on the condition of fitting grind fineness and medicament by using the reverse flotation flowsheet.