RU2137549C1 - Method for concentration of gold-bearing ore at sukhoy log deposit - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: method is intended for producing concentrate from gold-bearing ores. According to method, primary ore is initially crushed, then crushed ore is screened to produce 30 mm size fraction, after that ore fraction smaller than 30 mm is disintegrated in roller mills, and disintegrated material is conditioned with adding water and subsequent screening to produce fraction size of 0.5 mm. Material with particle size less than 0.5 mm is classified in hydraulic cyclones. Sands from hydraulic cyclones are directed to centrifugal benefication for production of concentrate which is brought for final treatment. Tailings are disintegrated in closed cycle with hydraulic cyclones for obtaining material with particle size smaller than 0.074 mm which is subjected to benefication in centrifugal apparatus. Concentrate from centrifugal apparatus is directed to retreatment. Discharge from classification hydraulic cyclones with particle size smaller than 0.5 mm is subjected to dewatering to produce concentrate which is also directed to retreatment. Application of aforesaid method allows for increased production of concentrate from gold-bearing ores of deposit. EFFECT: higher efficiency. 4 cl

Description

 The invention relates to the mining industry and can be used in the processing of minerals, in particular, to obtain a concentrate from gold-bearing ores of the Sukhoi Log deposit.

 Known methods for processing gold-bearing ores / 1 /, / 2 /, / 3 /, which cannot be effectively used in the processing of ores of the Sukhoi Log deposit.

 As the closest analogue, a method of enrichment of gold-bearing ore can be adopted, including crushing of the initial ore, screening of crushed ore, grinding of ore after screening, subsequent screening of ore, classification in hydrocyclones, direction of hydrocyclone sands for centrifugal concentration. / 1 /, p. 68 - 69, 77, 79, which is also not effective enough to extract concentrate from gold-bearing ores.

 The objective of the invention is to increase the degree of extraction of concentrate from gold-bearing ores of the deposit.

 The problem to which this invention is directed, is to increase the efficiency of enrichment of gold-bearing ore of the Sukhoi Log deposit. The technical result achieved using the present invention is to increase the recovery of gold in concentrate. The specified technical result is achieved by the fact that the screening of crushed ore is carried out according to the particle size class of 30 mm, and grinding of ore with a particle size of less than 30 mm is carried out in roller mills, the crushed material is conditioned with the addition of water and screened according to the particle size class of 0.5 mm, in hydrocyclones the material is classified by particle size less than 0.5 mm, the centrifugal concentration concentrate is sent for refinement, and the tailings are crushed in a closed cycle with hydrocyclones to obtain material with a particle size of less than 0.074 mm, which is enriched in the center tachometric devices, and the concentrate is directed centrifugal apparatus for finishing, while the drain of the hydrocyclone classification particle size of the material is less than 0.5 mm after centrifugal dehydration enrichment obtained concentrate is directed to debugging, and tails.

 These signs are distinguishing from the closest analogue.

 The specified technical result is also achieved by the fact that centrifugal enrichment is carried out in Nelson concentrators.

 And also the fact that centrifugal enrichment of sands with classifiers of material with a particle size of less than 0.5 mm is carried out by the operations of the main enrichment and two purifications of the concentrate of the main enrichment.

 And also by the fact that centrifugal enrichment of the discharge of hydrocyclones of the classification of material with a particle size of less than 0.5 mm is carried out by the operations of the main enrichment and the cleaning of the concentrate of the main enrichment.

 And also by the fact that before refinement of the concentrates, they are crushed and classified in additional hydrocyclones according to the particle size class of 0.074 mm, the hydrocyclones are drained for refinement, and the refinement is carried out in centrifugal apparatuses to obtain a rough concentrate directed to cyanide.

 The method is as follows.

 The initial gold-bearing ore with a grain size of 400 mm enters the first stage of crushing to a particle size of less than 100 mm in a cone crusher. From the crusher, belt conveyors crushed material is fed for screening in the size class of 30 mm. The size class +30 mm is completed on the second cone crusher, crushed material which is fed to the same screen with the same belt conveyor. Material with a particle size of less than 30 mm comes from the screen for grinding into roller mills (roller presses).

 The crushed ore is conditioned with the addition of water and fed to the screen in the form of pulp, where it is screened according to the size class of 0.5 mm. Coarse material of less than 0.5 mm is classified in hydrocyclones to produce sand and drain, which are enriched separately. Material larger than 0.5 mm is returned to the press roller. Sands of hydrocyclones are sent for main enrichment to CVD-32 Nelson concentrators with a 32-inch rotor diameter to produce two concentrates and tails.

 The concentrates of the main enrichment are subjected to two purifications: first, in Nelson concentrators CD-48, and then in centrifugal Nelson concentrators STS-20, as a result of which concentrate is sent for refinement and tailings. Tails are ground in a closed cycle with hydrocyclones. The discharge of hydrocyclones with a particle size of less than 0.074 mm is sent for enrichment to Nelson CD-48 concentrators, the concentrate of which is sent for refinement.

 The discharge of hydrocyclones of the classification of material with a particle size of 0.5 mm is fed into a plate thickener, the discharge of which is removed to the dump. After dehydration in plate thickeners, the sands are enriched in Nelson concentrators CD-48 (main enrichment) and a concentrate is obtained, which is also sent for cleaning in Nelson STS-20 centrifugal concentrators, as a result of which a concentrate goes for finishing and tailings.

 Before concentrating, all concentrates are refined in a mill operating in a closed cycle with additional hydrocyclones classifying the material according to the particle size class of 0.074 mm. The discharge of additional hydrocyclones with a rate of 0.074 mm and the concentrate obtained after enrichment of the tailings of the first purification of the concentrate of the main enrichment of the sands of hydrocyclones of the classification of material with a particle size of less than 0.5 mm are fed to the finishing process, which is carried out in centrifugal concentrators Nelson STS-20 to obtain a rough finishing concentrate directed on cyanidation.

Sources of information:
1. See V.V. Khabarov et al. "Progressive technologies for the extraction and processing of gold-bearing raw materials, M.," Nedra ", 1994, / 1 /, pp. 36-37, 51-69, 75, 77, Fig. 10.12.

 2. "Non-ferrous metals", M., 1998, N 5, p. 21-25.

 3. RU 2100090 C1, 12/27/97.

Claims (5)

 1. The method of beneficiation of gold-bearing ore, including crushing of the initial ore, screening of crushed ore, grinding of ore after screening, subsequent screening of ore, classification in hydrocyclones, the direction of hydrocyclone sands for centrifugal dressing, characterized in that the screening of crushed ore is carried out according to the class of 30 mm, class 30 and ore grinding with a particle size of less than 30 mm is carried out in a roller mill, the crushed material is conditioned with the addition of water and screened according to the particle size class of 0.5 mm, in hydroclones material is coarsened with a particle size of less than 0.5 mm, centrifugal enrichment concentrate is sent for fine-tuning, and tails are crushed in a closed cycle with hydrocyclones to obtain material with a particle size of less than 0.074 mm, which is enriched in centrifugal devices, centrifugal apparatus concentrate is sent for fine-tuning, while from the discharge of hydrocyclones classifications of material with a particle size of less than 0.5 mm after dehydration by centrifugal enrichment receive a concentrate sent for fine-tuning and tailings.  2. The method according to p. 1, characterized in that the centrifugal enrichment is carried out on Nelson separators.  3. The method according to claim 1 or 2, characterized in that the centrifugal enrichment of the sands with classifiers of material with a particle size of less than 0.5 mm is carried out by the main enrichment operations and two purifications of the main enrichment concentrate.  4. The method according to any one of claims 1 to 3, characterized in that the centrifugal enrichment of the discharge of hydrocyclones classifying material with a particle size of less than 0.5 mm is carried out by the operations of the main enrichment and the cleaning of the concentrate of the main enrichment.  5. The method according to any one of claims 1 to 4, characterized in that before refinement of the concentrates they are crushed and classified in additional hydrocyclones in the class of 0.074 mm, the hydrocyclones are drained for refinement, and the refinement is carried out in centrifugal apparatuses to obtain a rough concentrate directed to cyanidation.