Patent application number | Description | Published |
20090071881 | Method for Production of Bulk Concentrate for Extracting Precious Metals - This invention relates to methods for producing bulk concentrate for precious metal recovery from clay-salt residues of plants processing potassium-magnesium ore and rock salt, usable for recovery of components in the form of sedimentary and floated particles, wherein the liquid phase comprises components varying in solubility and density. The method is cost-effective and includes a three-stage hydro-cycloning applied to slimes with S:L=1:3 ratio, carried out sequentially via 10, 7, and 5 degree hydro-cyclones. The bulk concentrate is mixture of sedimentary and floated materials, insoluble in water slimes residue. The second hydro-cyclone discharge, being a salt solution and floated part of the residue with natural and artificially-made organic structure, is forwarded to the third hydro-cyclone for extracting the floated fraction via a discharge fitting and further mixing with concentrates of the first and second hydro-cyclones, formation of the bulk concentrate. The salt solution is extracted via a sand fitting. | 03-19-2009 |
20100202944 | METHOD FOR PREPARING SAMPLES FOR QUANTITATIVELY AND QUALITATIVELY DETERMINING THE PRECIOUS METAL CONTENT IN PRODUCTS OF PROCESSING OF POTASSIUM AND MAGNESIUM ORES - The invention relates to analytical chemistry and technology for processing clay-salt waste (slurries) of potassium-processing factories. The inventive method is based on the analysis of the totality of tested material and consists in annealing the nanoparticles of precious metal (Au, Pt, Pd) organic compounds at a temperature ranging from 600 to 950° C. in the presence of a chloride agent in the form of potassium chlorides (KCl) or sodium chlorides (NaCl) and in producing the acid-soluble compounds of said metals. The sample is exposed to the entire cycle of technological conversion: 1) chloridising roasting; 2) leaching with weak mineral acid solutions; 3) sorption of precious metal compounds on the industrial sorbent AM-2B 4 from the solution obtained after leaching and 4) desorption. A tradeable solution obtained at the end of said cycle is analysed for precious metal content. Said invention makes it possible to use the test portion which is required for a given test stage as opposed to non-representative test portions of 3-30 g which are used for conventional analytical methods and to exclude the ‘misses’ of the tested material in the analysis. | 08-12-2010 |
20110088512 | Method of precious metal recovery - The proposed methods of precious metal recovery and may be applied to the recovery of precious metals from various types of mineral raw source materials containing organic compounds of precious metals and chlorides of alkali and earth metals, e.g. collective concentrate produced from clay-salt residue of potassium production, or marker clays, etc. This method includes chlorinating roasting of the collective concentrate produced during enrichment of the material with residual chlorides, or natural concentrate with up to 15% chlorides content. Thereafter, the cinder is leached by an aqua-regia solution, the precious metals are recovered from the pulp via of sorption, chlorinating roasting is held at 600-700° C., the precious metals are leached from the cinder using diluted solution of aqua-regia, and then via sorption. The process is cost-efficient due to the use of chlorinating agent, reduction of the process steps number, decreasing of the roasting temperature, and the leaching by diluted acid. | 04-21-2011 |
20110128539 | METHOD FOR QUALITATIVE AND QUANTITATIVE DETERMINING ORGANIC COMPOUNDS OF PRECIOUS METALS IN VARIOUS COMPOSITION ROCKS - A method is proposed for preparation of a sample of various rocks, containing organic compounds of precious metals (such as Au, Pt, and Pt). The sample is usable for further analysis of the metals content. The sample being analyzed is mixed with potassium chloride or sodium chloride in a ratio of 5-to-95 percent, and further subjected to assay fusion with litharge. The resulted entrapped cold shot is dissolved in aqua regia, and its dilute solution is analyzed by the known atomic-absorption method or by the known method of atomic emission with the use of plasma fixed by induction. This method makes it possible to preserve maximum of the metal components being analyzed, whereas the traditional methods of sample preparation cause loss of the most part of organic components containing the precious metals. | 06-02-2011 |
20110308356 | METHOD FOR SORPTION RECOVERY OF PRECIOUS METALS - The method for sorptive extraction of precious metals from mineral raw materials containing alkaline and alkaline earth metal chlorides relates to hydrometallurgy and can be used for extracting precious metals (palladium, platinum, gold and silver) from different types of raw mineral materials. It includes sorption of precious metals from a pulp using a synthetic sorbent that contains strong and weak base functional groups, followed by desorption. Sorbent is washed in two stages with the liquid phase of the waste pulp and water, and then precious metals are desorbed using a hydrochloric acid solution of thiourea. Precious metals are precipitated from the thiourea solution into a collective concentrate using an ammonium hydroxide solution. The process is carried out in a cascade of six devices with screen drainages with a fixed volume of sorbent load in each device. Precious metals are desorbed at 50-60° C. using a solution containing thiourea and hydrochloric acid. | 12-22-2011 |