In-situ leaching of molybdenum and uranium is becoming an increasingly common process. The features of the material composition of ores, leading to a decrease in their filtration properties, were considered. Activation leaching with leaching solutions that have undergone electrophotochemical activation before contact with the ore mass were studied. Activation preparation of leaching solutions promotes the synthesis of clustered water molecules with collectivized protons and hydroxyl ions, as well as active forms of oxygen and hydrogen. Cell leaching of molybdenum from mature tailings of the Shakhtaminsk deposit was studied experimentally. After pre-oxidation with an active carbonate solution, a model borehole leaching was carried out with a chloride-hypochlorite solution. Molybdenum extraction on resin a was 85 % in 30 days. Experiments on the percolation leaching of uranium from the ores of the Uchkuduk and Sugraly deposits confirmed the potential possibility of a significant increase in the extraction of uranium by electrophotoactivated percarbonate solutions relative to aqueous solutions of sodium and ammonium carbonate. When leaching with carbonate solutions without an additional oxidizing agent, the extraction of uranium from the Sugraly deposit ore sample was 52 and 59 % (sodium carbonate and ammonium carbonate). The use of hydrogen peroxide as an oxidizing agent made it possible to achieve 87-88 % extraction into pregnant solutions in 21 days without pre-oxidation. The performed studies confirm the processing capability of extracting uranium and molybdenum by percolation leaching in columns and borehole leaching.
This article deals with a physical-chemical model of heap leaching processes justifying new technological approaches to recovering dispersed forms of gold from ores, placer sands and deute-rogene mineral raw materials. The key process of this model includes lattice diffusion of high-energy hydrion minerals and hydroxyl-radicals formed as a result of photochemical and electro-chemical processing of initial reagent aqueous solutions. Active components of gas-water emulsions obtained while processing initial reagent solutions provide a structural and material trans-formation of a mineral lattice which concentrates clusters of dispersed gold creating conditions for its interacting with complexing compounds of process solutions. The article also considers the technological processes of activation heap leaching of dispersed gold from the Pogromnoe ore field and the results of the experiments conducted in percolators with their charge ranged from 3 to 100 kg. The results have proved the efficiency of using gas-water suspensions prepared in the pho-toelectrochemical reactor with active ion-radical oxidizing agents.
The present work substantiates the method of mathematical modeling of metal migration assessment during the exploitation of primary and secondary deposits. The coefficient of environmental load was developed, which represents the dependence of metal migration into the environment on toxicity and time.
The magnetic-sorption-capillary method is a new environmental integrated process. This invention mainly combines processes and mixtures for the extraction and/or recovery of heavy metals contained in metalliferous materials or ores. The method also includes water treatment and purification. The extraction process is carried out under the action of sorption of magnetic and other energy fields. This method has been experimentally tested, its sufficient efficiency has been established.
As a result of the conducted research, the technological scheme of per-sorption leaching of gold has been developed, based on the formation of peroxide-hydroxide compounds that enhance microresonance interactions between gold atoms and coplexing anions, which are formed during pulp treatment with appropriate physical fields and radiation. The laboratory setup is designed for experimental verification of the efficiency of the magnetic capillary method of metal ion extraction. As a result of experiments carried out on the unit, the data were obtained, indicating the need to convert the magnetic-capillary system into a magnetic-sorption system, with the output of ions, mixed by the magnetic field, on the ion-exchange sorbent. Realization of experimental studies is supposed to be carried out in a multistage apparatus with a functional module consisting of ion-exchange boxes with an external mesh screen.
