Advanced Materials Research Vols. 560-561

Abstract: It is the first time to determine whether gallium in fly ash was dissolved out with aluminum and study how to separate gallium from aluminum and recover it, tracking and analyzing the gallium in the digested mother liquor from a power plant fly ash extracting Al₂O₃ by soda-lime sintering process. Carbon dioxide decomposition was performed to the digested mother liquor, exploring the influences on separation of gallium from aluminum from carbon dioxide decomposition time, flow rate, and carbon dioxide decomposition temperature. The results show that when feeding CO₂ into the solution, aluminum was firstly dissolved out as the form of Al(OH)₃ and then gallium. When carbon dioxide decomposition time, flow velocity and carbon dioxide decomposition temperature were 30min, 100mL/(min • L) and 40°C, respectively, the ratio of aluminum to gallium was from 1028 down to 200. Under this condition, most of aluminum was dissolved out from the solution but gallium was still in it, thus successfully separating gallium from aluminum and leading to a better condition of subsequent process of extracting gallium.

Abstract: Hemicellulose-based porous hydrogel for methylene blue adsorption from aqueous solution was studied. The surface morphology of sample was analyzed by SEM, finding that it had the porous structure. Effects of pH and initial concentration on the adsorption capacity were investigated. Isotherm studies found that the adsorption of metylene blue onto absorbent was a monolayer adsorption, and the maximum adsorption capacity was 444.44 mg/g. The adsorption mechanism was analyzed by FT-IR, and it showed that the produced -COO- groups in alkaline conditions were advantaged for adsorption process, which offers the impetus for combination of adsorbent and methylene blue. Hemicellulose-based porous hydrogel is an inexpensive and biodegradable material, and can be a promising absorbent for cationic removing from wastewater.

Abstract: Abstract: Polyaniline was electrochemically synthesized on stainless steel using sulfuric acid as the doping agent through cyclic voltammetry. The influences of the aniline monomer concentration and cycle number on electrochemical performance were investigated by cyclic voltammetry and the electrochemical impedance spectra. The results show that increasing aniline concentration leads to the increase of aniline electrochemical polymerization rate. The mass specific capacitance of polyaniline electrode increases with the increase of aniline concentration for 10 cycles and it reaches 769.55 F/g at the aniline concentration of 0.3mol/L. However, the capacitances of polyaniline prepared at different aniline concentrations display no apparent differences for 15 or 20 cycles. Furthermore, the capacitance decreases with the increase of cycling number. Electrochemical impedance spectroscopes show that the polyaniline keeps superior conducting performance in the potential range of 0.1V~0.4V

Abstract: In this paper a novel method for selective leaching nickel from pre-reduced laterite ore at atmospheric pressure was reported. The reduced calcine was leached in thin acid liquor to liberate the nickel and iron together firstly. By properly controlling the leaching condition, the leached iron ion could hydrolyze as goethite precipitate and regenerate the acid consumed in the leaching procedure. Finally, the nickel is selectively extracted into the leaching solution. The main factors in the leaching process, such as reduction degree of the laterite ore, acidity of the leaching solution were investigated as influence on the nickel extraction. The test results showed that selectively leaching of nickel could be achieved with an extraction degree up to 90% by reducing most of the iron in the lateritic ore to wuestite and controlling the pH value of the leaching solution below 2.5.

Abstract: This Olivine LiFe1-xCaxPO4/C composites (x=0 - 0.014) were synthesized by a solid-state method using sebasic acid as a carbon source. The structure and electrochemical properties of the LiFe1-xCaxPO4/C compounds were studied. The X-ray diffractometer (XRD) results indicated that Ca2+ doping did not affect the structure of the samples, but the unit cell volume of doped sample are slightly increased. Electrochemical measurements showed that the LiFe0.99Ca0.01PO4/C composite delivered a discharge capacity of 149 mAh g-1 at a 0.2 C-rate between 4.0 and 2.8 V, probably due to the significant improvement of electronic conductivity and Li+ ion diffusion. Besides, the cell can sustain a 20 C-rate, and this rate capability is equivalent to charge or discharge in 3 min.

Abstract: The ink transfer rate and ink absorption rate directly affects the quality of printing matter, so it is very important to know the influence factors of the ink transfer rate and ink absorption rate. This paper studied on the impact of offset paper smoothness and offset paper absorbency on the ink transfer rate, the impact of offset paper compactness and offset paper absorbency on the ink absorption rate. The results show that ink transfer rate is affected by offset paper smoothness within a certain range. The ink transfer rate is affected greatly by offset paper absorbency. The ink absorption rate is greatly affected by offset paper compactness and absorbency.

Abstract: Dynamics of modernization and particularities of suspension production of polypropylene at Tomskteftekhim Company has been presented. Results of commercialization of polymerization catalysts of 2nd and 4th generation have been analyzed.

Abstract: A convenient, rapid efficient method for the synthesis of azo dyes has been developed by coupling in a continuous-flow microreactor at room temperature. The advantage of this protocol is its continuousness, high efficiency and selectivity, short reaction time, and milder reaction conditions.

Abstract: As a result of the carried out complex researches the basic laws of burning and achievement of special effect sparkling mixtures are established, the technique of definition sparkling characteristics is tested by a photographic method, results on improvement of a compounding of mixtures for equipment of products of garden fireworks are submitted.

Abstract: This Based on analysis of the formation conditions of quartz of different fields, their structural and physicochemical properties of the known technologies of quartz grit were proposed a new operations to perform certain operations, cleaning the quartz grit. A comparison of the optical characteristics of quartz glass, melted in different ways vacuum melting of natural and synthetic raw materials has been carried out.