They also accompany the surrounding rocks. It was stated that the mean content of these elements in a deposit does not diverge from their mean concentration in the lithosphere. Zinc- lead ore and products of its enrichment were investigated using gamma spectrometry for the content of uranium, thorium and potassium 40. Spectrometric gamma investigations concerning zinc- lead ores and the products of their processing Both the concentrates meet the specifications required for metallurgical and chemical grades. Bench-scale flotation tests show that it is possible to obtain a lead concentrate assaying 65.24% Pb with recovery rate of 81.32% and a zinc concentrate containing 55.63% Zn content with recovery rate of 80.28%. The rougher concentrates obtained were subjected to one regrinding and two cleaning operations to achieve higher-grade concentrates of both metals. Different parameters of flotation process such as particle size of the feed, pH and % solids of the pulp, speed of impeller, type of reagents (collectors, frothers, regulators and modifiers) and their quantities, conditioning time and flotation time were optimized to attain maximum grade and recovery of respective concentrates. An effort was made to investigate the effect of important variables on grade and recovery of concentrates and to design the process flow sheet. The low-grade ore was upgraded by selective sequential froth flotation technology to recover both minerals. The polymetallic ore under investigation contains galena and sphalerite as valuable minerals of lead and zinc. Akram, A.Ī bench-scale beneficiation study was performed on low-grade complex lead-zinc ore of Duddar area, District Lasbela, Balochistan Province, Pakistan. (auth.)īeneficiation studies on low-grade complex polymetallic lead-zinc ore of duddar (lasbela) Balochistan, Pakistanīhatti, M.R. Acid-leaching experiments of this type may have possible applications in prospecting for basemetal sulphides. As found in previous leaching investigations, the dominant component of lead and uranium is extracted in the acid leach. Furthermore, in only the highest lead sample is the acid leach isotopic value compatible with that of the ore lead. In all except the very high lead samples (> 100 ppm), lead is derived from sources other than sulphides. For samples with higher (> 5 ppm) lead concentrations, the acid leaches are less radiogenic than the rocks or residues whereas for samples with 15 ppm lead, the data arrays are those expected for a dominance of ore/rock lead. In the volcanogenic Woodlawn Cu-Pb-Zn deposit, where pyrite is the dominant sulphide phase in the ore and a ubiquitous mineral in the host volcanics and shales, leaching experiments using HNO 3 -HCl to overcome the ore/rock lead dominance, resulted in highly complex lead isotopic data, dependent mainly on the original lead concentration in the rock. Lead isotope results of acid leaching experiments on acid volcanics and black shales in an ore environment Ambient gamma radiation dose rate in ground level air was also measured. Results showed the presence of natural radionuclides 226Ra, 232Th, 40K, 235U, 238U as well as the produced radionuclide 137Cs (from the Chernobyl accident). The activity concentrations of radionuclides in soil samples were determined by gamma spectrometry (HPGe detector, relative efficiency 23 %). For that reason we conducted preliminary measurements in the soil samples taken from the locations of lead and zinc ore deposits (Bosilegrad and Raska) and from the locations of phosphate ore deposits of phosphate (Bosilegrad). Therefore it is important to investigate the radioactivity in these resources as well as in the soil at the locations of ore deposits. Natural resources such as ores contain radioactive nuclides at various concentrations. Radioactivity of Ore Sites of Lead, Zinc and Phosphate in Serbia However previous removal (up to 40%) of dead rock permits to reduce sharply grinding and transpot costs It is shown that the results obtained on the enrichment of the ore and products of X-ray radiometric separation are similar. To evaluate the influence of the previous concentration of polymetallic ores by the radiometric separation method on indices of flotation and gravitation enrichments, investigations were carried out using ore sample (1.94%Pb, 1.13% Zn) from a lead-zink ore deposit. International Nuclear Information System (INIS) X-ray fluorescence separation of pure lead-zinc ores

Radiation island lead ore