Assessing the possibility of using dry concentration for oxidized pegmatite and granites at the Kedrovoe feldspar deposit

Introduction. Feldspar raw material is a natural source of silica, alumina, and alkali metal oxides. Each type of feldspar is distinguished by its applications and concentration methods. The main effective method of feldspar raw material concentration is flotation in the course of which the majority of harmful impurities are separated. However, this method is rather costly due to flotation reagents purchase, tailings ponds organization and maintenance, etc. Research relevance. Feldspar dry concertation technologies are promising in terms of resource-saving but uncommon. So, the development of a dry concertation technology for feldspar raw materials seems highly relevant. Research objective is to study the possibility of employing dry concentration technology to process feldspar raw materials at the new Kedrovoe deposit Methods of research. Laboratory equipment of JSC Uralmekhanobr was used for the research, namely centrifugal crusher DC-0.5; centrifugal deflection mill; laboratory-scale cascade classifier; dry electromagnetic separator SMS-20M ITOMAK, and tribo electrostatic separator. Results. The trials confirmed that it is possible to process Kedrovoe feldspar raw materials by dry methods and effectively use centrifugal crushing and grinding as preparation of raw materials for concentration. Feldspar concentrate with a mass fraction of Fe2O3 – 0.30%; SiO2 – 69.42%; Al2O3 – 17.36%; K2O + Na2O – 11.84% has been obtained, which meets the specifications. Conclusions. The technological studies confirmed the possibility in principle of using feldspar raw material dry concentration for oxidized pegmatite and granites of the Kedrovoe deposit at the processing plant of Malyshevskoe Ore Management JSC. Saleable feldspar concentrate has been obtained.

LOW-MELTING UNFRITTED GLAZE IN THE MATERIALS SYSTEM "QUARTZ SAND-ULEXIT-SODA-FELVESPATCH CONCENTRATE

The article presents the results of studies aimed at establishing the possibility of obtaining low-melting nephritized glazes for majolica with a glass transition temperature of not more than 1000 ° C in the system of materials "quartz sand - ulexite - soda - feldspar concentrate". A rational choice of raw materials will ensure the production of slips that are able to maintain their design chemical composition during the application of majolica to the shard, therefore, provide the specified chemical composition of the glaze and contribute to obtaining the required physical, mechanical and chemical properties of the glaze layer. The design of the material compositions of the charges and the chemical compositions of the glaze coatings was carried out using the mathematical planning of the experiment, which significantly reduced the time and material costs for research. The parameters that determine the quality of slips and glaze coatings have been established, their most optimal values have been identified, which ensure the production of acceptable glaze coatings, and the ways to optimize work in the studied direction have been determined. As a result, the fundamental possibility of obtaining low-melting nephritized glazes in the system of materials "quartz sand - ulexite - soda - feldspar concentrate, capable of transforming into a glassy state at temperatures not exceeding 1000 ºC, has been proved.

MULTICOMPONENT DEPOSITS WITH BY-PRODUCT AS THE MAIN SOURCE OF FELDSPAR RAW MATERIALS FOR MODERN TECHNOLOGIES

"Feldspar is raw materials with a growing volume of production every year, as well as a price for it. Feldspar consumption has been gradually increasing in ceramics, glass industry for solar panels, housing, and building construction. Feldspar raw materials include intrusive, effusive rocks, weathering crust of crystalline rocks, sedimentary altered and altered rocks, as well as partially medium and basic aluminosilicate rocks. It was defined an industrial application for each species of feldspar. Potassium feldspars (orthoclase, microcline, sanidine) are used in electroceramic, electrode, abrasive, and ceramics industries. For these productions, the potash module is fixed in a ratio of 2: 1. For some industries, in particular the manufacture of high-voltage ceramics, the necessary feldspars are as close as possible to pure potassium (with a modulus of at least 4: 1, which corresponds to 80% of the orthoclase component). Potassium-sodium raw materials, from a potassium modulus of at least 0.9, are used for building construction. Sodium minerals with non-standardized potassium modulus are used for the glass industry, the production of enamels, and products such as vitreous porcelain. Calcium feldspars, represented by plagioclase of higher numbers, have limited practical application and their presence in feldspar concentrates is undesirable. According to mineral associations, all types of feldspar raw materials can be divided into five types: 1) feldspar (syenites, trachitis); 2) quartz-feldspar (pegmatites, granites, sands, etc.); 3) nepheline-feldspar (nepheline syenites, alkaline pegmatites); 4) quartz-sericite-feldspar (shales, secondary quartzites); 5) quartz-kaolinite-feldspar (sands, alkaline kaolins, secondary quartzites). It is shown on the example of Ukrainian deposits of feldspar minerals that complex deposits with by-products become the main source for production. Especially if these are new mining operation facilities. The authors have identified three main types of such complex multicomponent deposits: 1) deposits of intrusive rocks where weathering crust of crystalline rocks are mined as a byproduct; 2) complex deposits, where feldspar rocks are enclosing or overburden and can also be considered as byproducts; 3) deposits where feldspar concentrate can be produced as a product of ore components processing."

Research on Separating Low-Grade K-Feldspar from Quartz without Hydrofluoric Acid

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.