Advanced Materials Research Vol. 826

Abstract: A region of liaoning low-grade magnesite ore products mainly for magnesite ,the gangue minerals are mainly hematite,calcite,chlorite,quartz,etc.This experimental using a roughing secondary selected single reverse flotation process,with hydrochloric acid, sodium silicate,sodium hexametaphosphate for adjustment,LKD for collecting agent,the ore are studied,in the conditions of mine ore SiO₂ content is 0.85%,MgO content is 95.53%,Fe₂O₃ content is 0.82%,obtain concentrate SiO₂ content is 0.17%,Fe₂O₃ content is 0.69%,concentrate grade (MgO content) is 97.31%,the recovery is 78.86% of the experimental index.The experimental of related mineral flotation purification provide identification and reference.

Abstract: The main metal minerals are magnetic pyrite arsenopyrite pyrites, galenite sphalerite,etc.The main gangue minerals are quarts,sericite,chlorite,carbonate,etc.Nature gold,electrum,bullion and nature silver are main gold silver minerals. The useful element is gold and silver and the impurity is arsenic. The experimental results of cyanide leaching crude and flotation concentrate show that the index of leaching rate of gold and silver being 93.90% and 81.38% are got on the condition of grinding fineness being 95.3%-0.074mm，pulp thickness being 33%，dosage if CaO being 2.5kg/t（pH≈11），dosage of NaCN being 3.0kg/t,leaching time being 24h by leaching crude of gold and silver grade being 0.82g/t、4.78g/t.

Abstract: Flotation tests for recovering zinc and iron from gossan ores was carried out in this paper. Flotation is the most commonly used method for beneficiation and pretreatment of oxidized zinc minerals. The effects of grinding fineness, amount of Na₂CO₃, amount of Na₂SiO₃, amount of Na₂S and amount of octadecylamine were investigated, respectively. The results show that the grade of zinc and iron increase slightly, and the best result is that the grade of zinc and iron are 13.12% and 41.15%, the recovery of zinc and iron are 76.83% and 77.95%. The results simply indicated that flotation could not effectively recover zinc and iron from gossan ores studied in this paper.

Abstract: The useful minerals of Jinchuan high-grade copper and nickel suphfide ores were mainly nickel and copper, whose grade were respectively 1.42% and 1.01%. The content of MgO and SiO₂, main gangue components, reached 57.89%. The key to improve the separation indexes of flotation concentrate was to inhibit the gangue minerals effectively, therefore, the effects of different kinds of regulators on Jinchuan high grade copper-nickel ores by flotation were studied. Considering the grade and recovery of concentrate comprehensively, the optimal regulator of mineral flotation was determined to be the combination of sodium hexametaphosphate and citric acid, and the dosage were 300g/t and 500g/t, respectively. After analyzing the mechanism of the two regulators, the combined reagents could reduce the isoelectric point of gangue minerals, decreasing the adsorption between gangue minerals and valuable minerals. In addition, the reagents were able to eliminate the activation of useless ions such as Ca²⁺ and Ni²⁺ on the gangue minerals and improve the ion composition of pulp, increasing the difference of floatability between gangue and useful minerals.

Abstract: Bromine atom with strong electronegativity was introduced to a position of dodecanoic acid as a new type collector DZF-3 in iron ore flotation. The structure of DZF-3 synthesized in the paper is verified by FT-IR and ¹H-NMR. And the collecting performances of DZF-3 are also presented through a series of flotation experiments of single minerals. Results show that DZF-3 is a kind of efficient collector especially used in room temperature in reverse flotation. Moreover, DZF-3 can collect quartz particles without activated by CaCl₂. Mechanism analysis shows that electronegativity and collecting performance of the collecting group-COO^- are increased by bromine atom. The enhancement of electronegative of dodecanoic acid by Br substituted in a position results in the competitive adsorption among active sites of Br atom and O atoms of carboxyl group with hydroxyl of quartz surface, then there occurs a chemical reaction between the Siⁿ⁺(n= 0-4) in quartz surface and active sites in DZF-3 molecules.

Abstract: Dispersion is the major factor to influence the behavior of calcined kaolin in the vibrating mill. The dispersion degree of powder affects not only the fluidity of the powder, but also the efficiency of the grinding. Organic and inorganic aids are used to promote the dispersion degree of powder in the vibrating mill. All of the aids can improve the dispersion degree. When the aids dosage is 5 for organic aids and 1 for inorganic aids respectively, the dispersion degree of the powder in the vibrating mill are the best. The aids can also improve the final powder size and their distribution.

Abstract: Potassium-feldspar rocks were ground for 10, 40, 120 and 180 minutes respectively using a porcelain ball mill. The kinetics of potassium release from activated rocks and their effect on yield and nutrient uptake by grain amaranth were evaluated. Results showed that high intensive grinding could improve physicochemical properties and bioavailability of potassium-feldspar rocks. With increasing grinding time, the particle diameters were decreased, the specific surface areas were increased, and the diffraction peaks were decreased remarkably. Maximum release of acid-soluble K was obtained in all rocks during the initial stages of leaching (0-10days), but their differences narrowed down at latter stages (10-60days). The cumulative release of K from the rock treated for 180 minutes was the highest amount (5331.51 K mg/kg rocks) and was 3.75, 1.29 and 19.8% higher than the rocks treated for 10, 40 and 120 minutes, respectively. Data from pot experiment revealed that activated rocks with higher bioavailability promoted the growth and K accumulation of gain amaranth. This study indicated that mechanical activation could be an alternate technology for the efficient of using potassium-feldspar rocks for crop production.

Abstract: To investigate biomass classification technology, such as rotary classifier, and to select appropriate biomass classifier. Through the change of different feeding rates and rotation speeds of the classifier, the classification efficiency and Newton classification efficiency, specific particle size and uniformity index, the recoveries of coarse and fine powder and energy consumption were measured. The results indicate that feeding rate and rotation speed have an important effect on the classification. When the rotation rate of classifier is 300rpm, the classification efficiency decrease basically, but in 78.96kg/h, it is the maximum. And Newton classification efficiency would decrease at first and then increase, in 88.96kg/h, it is the lowest. When the feed rate are 78.96kg/h and 88.96kg/h, as the rotation speed increases from 50r/min to 150r/min, there is a moderate increase in uniformity coefficient, that means the biomass size distribution becomes narrower. The energy consumption means the pulverizer capacity is larger, the less is the wasted energy. It is a common sense that the larger the mill, the higher the efficiency.

Abstract: With using the red mud of Bayer process and industrial hydrochloric acid as main initial materials, iron oxide red was prepared by chemical precipitation technique. The character of the sample were characterized and analyzed by means of XRD, SEM, particle size analyzer, and chemical analysis methods, respectively. The optimal experimental condition of extraction of iron from red mud was obtained, and the key quality indicators of sample was conformed the requirements of iron oxide red by a variety of test and characterization.

Abstract: Flotation technology without fluorite was studied to separate low-grade K-feldspar with quartz. It is shown in the results that qualified K-feldspar concentrate can be gained by grinding, desliming, flotation and high intensity Magnetic Separation process. Feldspar concentrate obtained in closed-circuit had a content of K₂O and Na₂O 12.12%, quartz concentrate with a yield of 19.94% containing 97.12% SiO₂ was obtained in the same time.