Papers by Keyword: Aluminosilicates

Abstract: Low grade copper concentrate, composed mainly of plagioclase, quartz, pyrite, chlorite, chalcopyrite, glauconite, is a promising source for the future recovery of copper and other valuable components, which processing by existing methods are not economical. An alkali pressure leaching method, followed by acid leaching for extraction of aluminum and silica from such low-grade copper concentrate with the aim to enrich other valuable metals content, was explored in this research. The samples were characterized by using wet chemical analysis and X-ray diffraction. An alkali pressure leaching, followed by dilute acid leaching for enrichment of low-grade copper concentrate, allows to extract in a solution of 90,4% Si, 83.82% Al and 7.73% of Cu with the following optimal parameters: NaOH/concentrate-1 mass ratio = 65%, alkali leaching temperature = 240 °C, the alkali leaching time = 90 min. The content of copper in the final concentrate was 19.17%. Consequently, the technology of processing of low-grade copper raw materials is proposed, that allows to increase the comprehensiveness of raw materials usage.

Abstract: The development of geopolymer in this work prioritized the use of industrial wastes including bottom ash from the coal burning and metakaolin from purification and thermal treatment of waste paper. The main objective was the synthesis to obtaining geopolymer cement to verify the characteristics of the material. The alkaline activator used was a mixture of potassium hydroxide (KOH) in molar ratio of 12 and 15 M and sodium silicate (Na₂SiO₃). X-ray fluorescence (XRF), X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyzes were performed for characterization. The XRD patterns show changes in the microstructure of the feedstock. Through the micrographs it can be seen that the samples show various aspects of geopolimerization. Geopolymeric materials can be presented as a viable alternative to meet the great demand in the cement area and contribute to the utilization of industrial wastes.