RU2456100C2 - Method of dry concentration at mobile modular ore dressing complex - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to concentration of minerals, particularly, to processing of gold-containing ores of quartz-vein type in smaller deposits and occurrences. Proposed method comprises the following processes: scalping, crushing of coarse sizes, fine crushing, coarse grinding and pneumatic separation, finishing of pneumatic separation concentrate and storing pneumatic separation tails. Crushing of coarse sizes is performed before scalping to separate the material into three fractions: +5 mm, -5+2 mm, - 2 mm. The +5 mm flow is directed for fine crushing. The -5+2 mm flow is directed to coarse crushing. The -2 mm flow is directed to pneumatic separation. Fine- and coarse-crushed material is directed to scalping.

EFFECT: higher efficieincy.

1 dwg

Description

The complex is designed for processing and beneficiation of gold ore.

There is a method of enrichment used in an ore-dressing mobile modular complex for processing gold-bearing ores of predominantly small deposits, where the following processes occur sequentially: preliminary screening, crushing of large classes -350 mm, fine crushing, coarse grinding and gravity dressing, fine grinding in a ball mill [1 ].

The disadvantage of this enrichment method is that the enrichment module uses wet enrichment methods, which require a number of additional conditions for placement and installation (organization of water management, etc.).

There is also a method of enrichment, where the following processes take place sequentially: preliminary screening, crushing of large classes -350 mm, fine crushing, coarse grinding and pneumoseration, this method is used on an ore-dressing mobile modular complex [2].

The disadvantage of the complex is the inability to ensure a rational level of performance in terms of the efficiency of each hardware node of the line.

The essence of the invention consists in a method of dry enrichment on an ore-dressing mobile complex, in which the following processes occur sequentially: preliminary screening, crushing of large classes, fine crushing, coarse grinding and pneumo-separation, characterized in that after head crushing the enriched material is pre-classified by screening and basic the process stream is divided into three streams, while the stream of particle size class +5 mm is finely crushed and crushed according to a current of class +5 mm is returned for re-screening, a stream of class size -5 +2 mm is fed for coarse grinding and returned for re-screening, and a stream of class size -2 mm is fed to a pneumatic separator, after which the concentrate is sent for fine-tuning, and the tailings of pneumatic separation are sent for storage.

In contrast to the accepted analogue [1], where the main enrichment stage is divided functionally into two modules: the main enrichment module and the control enrichment module, the proposed scheme proposes one lapping module using dry technology and pneumatic separation. This makes it possible to significantly increase the depth of dry concentration to obtain concentrates suitable for shipment to a concentrating plant, as well as significantly simplify the concentration technologies and eliminate the use of process water. Thus, this invention meets the criterion of "novelty."

In the present invention, in contrast to the adopted prototype [2], after head crushing, preliminary classification of lump ore by screening is added, which allows to divide the main process stream into three streams and to provide “parallel” operation of the following units: DKD-300 combined impact crushers according to class +5 mm, centrifugal mill TsMVU-800 in the class of -5 +2 mm, pneumatic separator POS-2000 for the enrichment of small size classes of -2 mm. This technological combination makes it possible to increase the rationality of the enrichment scheme, since the +5 mm class is purposefully directed to the stage of fine crushing, smaller classes -5 +2 mm are sent, bypassing the crushing stage, to grinding, and the finished fraction of -2 mm is subjected to pneumatic separation. A rigid straight line for ore processing according to the prototype does not have this property. In addition, the parallel operation of the equipment allows you to unload the equipment as much as possible and increase the overall throughput of the complex, and not limit the overall performance to one less productive equipment.

Thus, the present invention meets the criterion of "inventive step".

The essence of the method of dry beneficiation at an ore-dressing mobile complex is illustrated in Fig. 1, depicting an ore-dressing mobile modular complex of dry beneficiation, where the initial ore with a grain size of 350 mm is subjected to head crushing, then primary screening at screen 4 (GIL-22) into three size classes (+5 mm ; -5 +2 mm; -2 mm). The coarseness class +5 mm is subjected to fine crushing 5 (DKD-300), after which the detailed product of the coarseness class +5 mm is sent to the preliminary screening operation for re-screening to 4 (GIL-22). The size class -5 +2 mm is fed to coarse grinding 6 (TsMVU-800), after which the crushed product is also returned to re-screening. And the size class -2 mm is subjected to pneumatic separation 7 (POS-2000), the concentrate is sent to the finishing stage, the pneumatic separation tails are dumped and sent for storage.

Calculation of a quantitative ore processing scheme shows that, according to the new scheme, the total throughput of the complex increases from 6 to 8 t / h due to more efficient use of equipment. Experimental studies in the framework of industrial testing of the equipment of the complex revealed the most effective working conditions for each equipment in terms of productivity: the DKD-300 combined impact crusher - 7 t / h, the TsMVU-800 centrifugal mill - 4 t / h, the POS-2000 pneumatic separator - 8 t / h

The calculation of the balance of material flows shows that the new technological enrichment scheme provides these rational operating conditions for each equipment.

Claims (1)

A method of dry enrichment at an ore-dressing mobile complex, in which the following processes occur successively: preliminary screening, crushing of large classes, fine crushing, coarse grinding and pneumatic separation, refinement of the pneumatic separation concentrate and storage of pneumatic separation tailings, characterized in that crushing of large classes is carried out before preliminary screening, dividing the material into three classes of fineness: +5 mm, -5 + 2 mm, -2 mm, while the flow of the fineness class +5 mm is directed to small dr pouring, a stream of class size -5 + 2 mm is fed for coarse grinding, and a stream of class -2 mm for pneumatic separation, crushed by fine crushing and crushed by coarse grinding, the flows are sent to the preliminary screening operation.

Images