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INVENTION
Russian Federation Patent RU2201289

Way of dressing of ores of rare and precious metals

Way of dressing of ores of rare and precious metals

Name of the inventor: Urvantsev Anatoly Ivanovich
The name of the patentee: Urvantsev Anatoly Ivanovich
Address for correspondence: 620063, Yekaterinburg, and / I 581, A.I.Urvantsevu
Starting date of the patent: 2000.09.14

The invention relates to mineral processing and can be used in the extraction technology of non-ferrous, precious and rare metals from alluvial deposits of ores of rare and precious metals (primary alluvial deposits and / or man-made structures - tails). Method for processing ore of rare and noble metals, comprising multistage disintegration classification and magnetic separation is carried out on the frozen starting material naturally open industrial sites in freezing temperatures and the additional electrical separation rougher concentrate. The invention reduces the energy consumption, water consumption, and drainage disintegration, but also allows to arrange round production cycle and recovery of precious metals.

DESCRIPTION OF THE INVENTION

The invention relates to mineral processing and can be used in the extraction technology of non-ferrous, precious and rare metals from alluvial deposits of ores of rare and precious metals (primary alluvial deposits and / or man-made structures - tails).

There is a method of enrichment placers (primary enrichment), which includes the sands extraction, disintegration of jetting by water jets, screening, primary enrichment in stationary or mobile gateways, screw, cone separators, jigs, concentration tables (SI Polkin. Ore and placer deposits of rare and precious metals -. M .: Nedra, 1987, s.27-33).

The disadvantage of this method is the low extraction of minerals in the primary enrichment placers (and industrial waste) with a high content of clay. The higher content of clay fractions in the raw sands, the worse the disintegration, the more water consumption for washing and disintegration (100-150 m 3 of water per 1 m 3 of rock). At high flow rates of water occurs at the gateway increased demolitions in the tails of gold and other minerals (heavy) minerals, especially particles less than 0.5-0.25 mm. Big water consumption entails high costs of electricity at its pumping, increased material and operating costs, which, combined with low extraction of mineral concentrates has drastically reduced the profitability of the entire production. In water-limited deposits of this method of disintegration may be impracticable altogether.

The wet method of disintegration leads subsequently to increased costs for the maintenance of liquid tailings primary enrichment (construction and maintenance of slurry ponds), dehydration and drying to dry roughing concentrates on honing techniques enrichment plants.

The most close technical decision to the claimed is a method for recycling rare and noble metals, comprising multistage disintegration classification and rougher concentrate magnetic enrichment (RU, 2078616 C1, B 03 B 7/00, 05.10.97) - prototype.

The present invention is directed to improving the efficiency of the enrichment process of metal species placer mixtures, preferably mixtures of gold-containing, along with small particles and a significant amount nugget size from 3 to 25 mm. However gidrovashgerde disintegration at a jetting is wet disintegration, which requires a large flow of water, auxiliary equipment (pumps, piping, etc.), and therefore, this process is very energy-consuming and increases the cost of extracting minerals. Furthermore, in arid areas (or in the winter), this method is not practically feasible, i.e. It is seasonal.

The object of the invention to provide a resource- and energy-saving technology to extract gold and other precious and rare minerals from placers primary or man-made structures (tailings).

Technical result which is achieved from the use of this invention is to reduce energy consumption, water consumption for disintegration and dehydration, and in the possibility of organizing year cycle extraction and recovery of precious metals.

Technical result is achieved by a method for processing ore of rare and noble metals, comprising multistage disintegration classification and magnetic enrichment rougher concentrate, all the above operations are carried out on naturally frozen starting material in open industrial sites at negative temperatures, and rough concentrate is further subjected to an electric separation .

The invention consists in the binding of (freeze) the free water contained in the raw material (clay, sand tailings (the waste of man-made)). As is known, the destruction of non-viable aggregates (clay, gangue minerals and ice) occurs primarily by the weakening of bonds: the ice - solid. There is first of all highlighting "gall dry" and the formation of sludge dry clay and ice, which then can be easily removed in the process of multi-stage classifications and elektroseparatsy. The multistage disintegration of the raw material (frozen sand or industrial waste) impact energy more economical, because It does not require any water gidrovashgerda, pumps, pipelines; We do not want the cost of creating storage ponds, dams; not need the cost of cooling the ore, as disintegration and de-icing is carried out on the open industrial sites in subzero temperatures. In this case, than the north of the deposit, the longer the season of freezing temperatures, the longer the term of the enterprise for the proposed technology and, consequently, greater output of minerals (precious metals, or rare-earth concentrates).

Enrichment rougher concentrate dry process in an electric field (electric separation) and more economically than in wet enrichment gravitational fields, because in this method, there is no water consumption. Such a method can be carried out in the winter, reducing (eliminating) the unproductive downtime inter-seasonal businesses.

From the analysis of scientific, technical and patent literature claimed the aggregate raw ore concentration techniques have been identified, which allows to conclude that the claimed technical solution criteria of "novelty" and "inventive step".

Extracted draglines ore of rare or precious metals - the sands of one of the Northern Urals placers with a high content of clay (40-50% grade - 0.020 mm) are subjected to the disintegration of jetting, then dredge through slurry pipeline is fed to the installation of locks deep and shallow content. The yield of extracted gold from the heavy fraction of the gateway installation is 150-200 mg / m mass produced and washed sand.

The light fraction Gateway installation (tails - technogenic waste) were further processed by the claimed method. The starting material weighing 120 kg, submitted mostly rounded aggregates of clay, sand, "Gali" humidity around 17%, was kept on the street in the open at the industrial site - (8-12) o C for 3 days. Then, the first shock was disintegration and screened on a sieve of 80 mm, followed by removal + fraction (80-100) mm fraction - 0.020 mm air classification. Faction - (80-100) mm passes the second stage of disintegration of the impact force at high speed hitting a further screening for fractions of 20-25 mm. 20 mm fraction is crushed on a jaw crusher and screened on a sieve of the control 20 mm to trap large nuggets (-80 + 20 mm). Next fraction -20 + 0.020 mm are subjected to the third stage of disintegration and classification of stroke. Fraction -20 + 5.0 mm is subjected to crushing and classification rolls 5.0 mm sieve. Thus the fraction + 5.0 mm is the rough concentrate (productive fraction - gold), and the fraction - 5.0 mm directed to the fourth disintegration. After dedusting fraction -5.0 mm + 0.020 + 0.020 and 0.5 mm (roughing concentrate) is subjected to magnetic separation and further electrical separation to obtain fraction nonmagnetic conductors (gold, platinum, etc.), the magnetic fraction conductors (magnetite , ilmenite, and so on. p.) and neprovodnikovoy elektroseparatsii fraction (quartz, rock, ice).

enrichment method of the present results are shown in Table 1 and indicate that the proposed method for gold recovery was 94.3% (21.7% + 72.6%) (the prototype - 88.8).

Table. 2 shows the technical and economic parameters of the proposed method and the prototype.

From Table 2 shows that the proposed method does not consume water, power consumption is about 3 times lower reduces the initial humidity of 15-17% to 1%. This eliminates the need for the construction of reservoirs, accumulators, sludge and hydraulic transport system, which significantly reduces the cost of processing and redistribution increases the gold recovery is particularly fine fractions of less than 0.5 mm.

When using dry clay can be non-waste technology.

CLAIM

Method for processing ore of rare and noble metals, comprising multistage disintegration classification and magnetic enrichment rougher concentrate, characterized in that the multistage disintegration classification and magnetic separation is carried out on naturally frozen starting material in open industrial sites under conditions of negative temperatures, while the rough concentrate is further subjected to electrical separation.

print version
Publication date 14.03.2007gg