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.

THE USE OF FLOTATION METHOD FOR PURIFICATION OF WASTEWATERS CONTAMINATED WITH OIL PRODUCTS

Industrial and natural wastewater is one of the factors of environmental pollution, in particular, its water basin. Among others, fuel and oil pollutants are toxic substances that cause significant harm to all living things. It is necessary to create technologies using effective methods of wastewater treatment to solve such problems. It is possible to properly select and effectively use methods of treatment taking into account the nature, condition and concentration of contaminants in wastewater. These are the issues addressed in this article. Particular attention is paid to the use of flotation as a method of purification of stable highly dispersed emulsified wastewater containing oil or fuel contaminants in the technology of this type wastewater treatment. The main objectives of the study were to evaluate the impact of parameters and flotation reagents on the efficiency of the process of purification of stable highly dispersed emulsified wastewater. Flotation of these wastewaters was carried out on a laboratory flotation installation of pneumatic type and compared with the process of wastewater settling over time. Studies have shown that for stable emulsified wastewater containing oil or fuel contaminants with a low content of highly dispersed particles of inorganic nature or a stabilizer is present in them, it is advisable to use the flotation method with flotation units of pneumatic type. Analysing the results, it should be noted that the flotation method significantly reduces the purification time of highly dispersed emulsified wastewater from 3-5 hours of their settling in settling tanks-oil traps up to 10-20 minutes by the method of pneumatic flotation, while the degree of wastewater treatment increases in at least 1.5 - 2 times depending on the presence of fuel or oil contaminants in wastewater. If the wastewater contains a stabilizer, such as a surfactant, it can be used as an effective flotation reagent in the purification of this type of wastewater by flotation, which is not suitable for the settling process.

Complex Technology of Ash and Slag Waste from Power Plants

The development of a comprehensive technology for the processing of ash waste (ASW), which is based on the extraction of carbon from the CSO by flotation method and iron-containing minerals by means of magnetic separation, is presented. The proposed approach is based on the extraction of carbon from ash and slag by flotation and iron-containing minerals by magnetic separation. In this work, the optimal size of the ash fraction supplied for flotation was established. It is shown that when the technological process is carried out according to the stadium scheme when flotation reagents are fed in fractions, it allows their consumption to be reduced and the recovery of carbon concentrate from underburning to be significantly increased. The developed technology was tested on a pilot plant. High-quality carbon, iron-containing and aluminosilicate products were obtained. Auxiliary enrichment processes such as classification, thickening and filtration were tested.

Specific Ion Effects on the Behavior of Mixtures of Sodium Iso-Butyl Xanthate and Sodium Diethyl Dithiophosphate during the Flotation of a Cu-Ni-PGM Ore: Effects of CaCl2 and NaCl

Inorganic electrolytes present in the process water used during froth flotation may have both beneficial and detrimental effects. These effects are said to be ion specific, as some ions may result in enhanced froth stability, increased mineral recoveries and decreased concentrate grades, while others may bring the opposite effects. Onsite process water quality variations have intensified the need to understand the relationship between inorganic electrolytes and flotation reagents on flotation performance. The use of mixtures of thiol collectors in sulfide flotation is a common practice across the globe; however, very few investigations have considered these in process waters of varying compositions. This study considers the effect of common cations, Na+ and Ca2+, in process water on the behavior of mixtures of thiol collectors. Single-salt solutions of NaCl and CaCl2 at an ionic strength of 0.0213 mol·dm−3 were used to investigate the behavior of mixtures of two thiol collectors. These were carefully selected to understand how mixtures of thiol collectors behave in the presence of a monovalent cation versus a polyvalent cation. Bench-scale froth flotation tests were conducted using a Cu-Ni-PGM ore from the Merensky Reef. The results have shown that the divalent cation, Ca2+, resulted in higher %Cu and %Ni recoveries at all collector mixtures compared to the monovalent cation, Na+. The concentrate grades were, however, slightly compromised, as slightly more gangue reported to the concentrate in the presence of Ca2+. This behavior is attributed to the effect of polyvalent cations on bubble coalescence and froth stability.