RU2192312C1 - Method of gold recovery and device for method embodiment - Google Patents

Abstract

FIELD: mineral concentration. SUBSTANCE: method includes supply of pulp onto inclined upper run of moving endless belt, treatment of pulp with magnetic field for formation of sedimentation structure from pulp ferromagnetic particles with simultaneous sedimentation of gold on given structure and unloading of concentrate. Stationary magnetic field is used for treatment of material on lower section of belt upper run, and variable magnetic field is used for treatment of material on upper section. Magnetic members setting-up stationary magnetic field are moved in synchronism with belt. Device for recovery of gold includes endless belt installed on drums. Upper run of endless belt is inclined to horizon. Device also includes drive, magnetic system for setting-up stationary and variable magnetic fields, means for supply of pulp, water and reception of concentrate. Magnetic system for setting-up of stationary magnetic field includes a row of magnetic members forming flexible endless chain and embraces lower drum under belt and intermediate drum installed under belt upper run. EFFECT: efficient recovery of gold. 2 cl, 4 dwg

Description

 The invention relates to mineral processing, in particular for the extraction of gold from placers, ores and tailings, and can also be used to extract other heavy minerals (silver, cassiterite, scheelite, platinoids, etc.).

 A known method of gold extraction, including feeding pulp to an inclined chute, exposing the pulp to a magnetic field to form a precipitation structure from the ferromagnetic particles contained in the pulp, simultaneously depositing gold on this structure, unloading the concentrate (see ed. St. 37877 Bulgaria, MKI B 03 1/08; claimed 09.02.84; publ. 09/27/85; application UK 2139119, MKI B 03 C 1/06; publ. 07.11.84, 4993). The impact on the pulp is carried out along the entire length of the gutter with either a constant (see ed. St. 37877, Bulgaria) or an alternating (see UK application 2139119) magnetic field.

 A device for implementing this method of extracting gold includes an inclined trough, a magnetic system located under it, and means for feeding pulp and receiving concentrate (see ed. St. 37877, Bulgaria).

 A disadvantage of the known method for extracting gold and a device for its implementation is the low efficiency of gold extraction. So, in the case of exposure to the pulp with a constant magnetic field, the unloading of the concentrate should be carried out periodically (see ed. St. 37877, Bulgaria). In this case, a decrease in the capture ability of the precipitating structure from ferromagnetic particles after its saturation leads to gold losses, and, in addition, exposure to a constant magnetic field does not allow cleaning the precipitating structure-concentrate from light mineral particles settled on it (quartz, etc.) . In the case of exposure to the pulp with an alternating magnetic field, the discharge of the concentrate can be carried out continuously (see application UK 2139119). It also allows you to constantly clean the sedimentary structure of the concentrate from the particles of light minerals settled on it. However, these circumstances simultaneously lead to gold losses along with leachable particles of light minerals.

 The closest in technical essence to the claimed one is a method of extracting gold, including feeding the pulp to the inclined upper branch of a moving endless ribbon, exposing the pulp to a magnetic field to form a precipitating structure from the ferromagnetic particles contained in the pulp on the upper branch of the ribbon, simultaneously depositing gold on this structure, unloading of the concentrate (see Pat. Australia 571597, MKI B 03 B 005/72; decl. 26.10.83; publ. 21.04.88). In this case, the pulp is exposed on the entire upper branch of the tape with an alternating magnetic field, the pulp is produced in the middle part of the upper branch of the tape, and additional water is supplied to the upper part for cleaning the concentrate. Due to this, two processes are sequentially carried out on the upper branch of the belt: on its lower section I (Fig. 1), below the pulp feed point - simultaneously the formation of a precipitation structure with the deposition (extraction) of gold on it and the cleaning of the precipitation structure-concentrate, in the upper section II - only cleaning the precipitating structure of the concentrate. The movement of the tape allows these processes and unloading of the concentrate to be carried out continuously.

 A device for implementing this method of extracting gold includes an endless tape mounted on the reels, the upper branch of which is inclined to the horizon, a drive, a magnetic system for creating an alternating magnetic field located under the upper branch of the tape, means for feeding pulp, water and receiving concentrate (see US Pat. Australia 571597).

 The disadvantage of the data of the method of extracting gold and a device for its implementation is also the low efficiency of gold extraction. Since both the upper section II (Fig. 1) and the lower section I of the upper branch of the ribbon act on the pulp and, accordingly, the precipitating structure-concentrate by an alternating magnetic field, the latter is in a mobile vibro-flocculation state, which leads to gold losses together with particles of light minerals washed out of it.

 The present invention improves gold recovery efficiency.

 The essence of the invention lies in the fact that in the method of extracting gold, including the supply of pulp to the inclined upper branch of a moving endless ribbon, the pulp is exposed to an alternating magnetic field to form a precipitating structure from the ferromagnetic particles contained in the pulp on the upper branch of the ribbon, while the gold is deposited on this structure , unloading of the concentrate, in the lower section of the upper branch of the tape affect the pulp with a constant magnetic field, while the magnetic elements creating this field are moved with nhronno with tape.

 The essence of the invention also lies in the fact that the device for extracting gold, containing endless tape mounted on the drums, the upper branch of which is inclined to the horizon, a drive, a magnetic system for creating an alternating magnetic field located under the upper branch of the tape, means for feeding pulp, water and receiving concentrate, is equipped with an additional magnetic system and an intermediate drum, the latter being located under the upper branch of the tape, and the additional magnetic system includes a number of magnetic elements, forming a flexible endless chain, covering the lower and additional drums under the tape.

 Due to the fact that in the known method for extracting gold on the lower section of the upper branch of the tape, the pulp is exposed to a constant magnetic field, while the magnetic elements creating this field are moved synchronously with the tape, only the formation of a precipitation structure occurs on the lower section of the upper branch I (Fig. 2) and the precipitation of gold. The concentrate structure moves together with the portion of the tape on which it is formed without undergoing periodic restructuring; accordingly, gold particles deposited on it are not washed out of it. The purification of the concentrate is carried out only on the upper section II of the upper branch of the tape in the zone of exposure to an alternating magnetic field. Thus, section I, in contrast to the prototype method, is a zone for the simultaneous formation of a precipitation structure and gold deposition, and section II, as in the prototype method, is a zone for concentrate purification. Washed out of the precipitating structure-concentrate during its cleaning in section II, gold particles are captured in section I, which reduces the loss of gold in the implementation of the inventive method for the extraction of gold.

 When the pulp is fed to the upper branch of the tape into the zone of exposure to an alternating magnetic field, when implementing the inventive method for gold extraction, in addition to sections I and II, similar to the processes above, section III (Fig. 3) is also highlighted, on which the formation of a precipitation structure occurs simultaneously , gold deposition and refining of the resulting concentrate structure. And in this case, the gold particles that are washed out during the cleaning of the concentrate structure both in section III and in section II are captured in section I.

 The supply of the known device for the extraction of gold with an additional magnetic system and an intermediate drum, the latter being located under the upper branch of the tape, and the additional magnetic system includes a number of magnetic elements forming a flexible endless chain covering the lower and additional drums under the tape, provides an impact on the pulp on the lower plot of the upper branch of the tape with a constant magnetic field relative to the moving tape due to the synchronous movement of magnetic elements and tape. Thus, the precipitation structure concentrate from ferromagnetic and heavy, self-generated in this section of the tape, including gold, particles is not subjected to periodic restructuring, respectively, the gold particles deposited on it are not washed out of it, which allows to achieve the indicated goal of the invention is to increase the efficiency of gold recovery.

 The invention is illustrated by drawings.

 Figure 1 presents a diagram of the implementation of the method of the prototype, figure 2 - of the inventive method of extracting gold when feeding the pulp into the area between the areas of exposure to a constant and alternating magnetic field, figure 3 - the same when feeding the pulp to the area of exposure to an alternating magnetic field in FIG. 4 is a diagram of a device for implementing the inventive method for extracting gold.

 The implementation of the proposed method for the extraction of gold is as follows.

 The initial product in the form of pulp is fed to the inclined upper branch of a moving endless ribbon (Fig. 2) and is exposed to it by a constant magnetic field, while the magnetic elements creating it are moved synchronously with the ribbon. Ferromagnetic particles contained in the pulp under the influence of a given magnetic field and gravity, and heavy non-magnetic particles, incl. gold, under the influence of gravity, settles on the surface of the tape, forming a precipitating structure, which is both a rough coating of the tape, polygradient structure and concentrate. The surface roughness of the tape, increased due to flocculation of ferromagnetic particles contained in the precipitation structure under the influence of a constant magnetic field, determines the effective gravitational deposition of gold particles, and the polygradient properties of the precipitation structure - the extraction of gold particles with weakly magnetic properties (in the “shirt”, amalgams), similarly high-gradient magnetic separation processes. The synchronous movement of the magnetic elements creating a constant magnetic field with the tape provides movement with the tape and the concentrate structure self-generated on it. Moreover, this structure is not subjected to periodic restructuring; accordingly, particles settled on it are not washed out, including gold. Thus, in the lower section I of the upper branch of the ribbon, self-generation (formation) of the precipitation structure is carried out with the simultaneous deposition of gold particles on it.

 Then, after moving the concentrate structure with the tape to the upper part, an alternating magnetic field is applied to it and, thus, the concentrate structure is transferred into a vibroflocculation state. At the same time, water is supplied to this section of the tape, which washes light minerals from periodically destroyed flocs of the concentrate structure. Thus, in the upper section II of the upper branch of the tape, the concentrate obtained in the lower section I is scrubbed.

 The concentrate purified from light minerals is unloaded and sent for fine-tuning.

 Gold particles washed out during the concentrate purification, after their removal by a stream of water into the exposure zone by a constant magnetic field, are again captured by the concentrate structure formed in this section of the first tape, which excludes their drift into tails. An insignificant drift of the water washed out during the purification of the concentrate of ferromagnetic particles into the zone of constant magnetic field exposure provides an increased rate of formation of the precipitating concentrate structure and the strength of the flocs formed during its formation and, as a result, increased gold recovery.

 If the supply of pulp is carried out in the zone of influence of an alternating magnetic field (Fig. 3), then the initially formed precipitating structure-concentrate has a vibro-flocculation state. At the same time, in section III of the upper branch of the tape, in the zone of exposure to the pulp with an alternating magnetic field, the formation of a precipitation structure, the deposition of gold and the purification of the resulting concentrate structure occur simultaneously. Gold particles washed out during the cleaning of the concentrate structure, after their removal by a stream of pulp and water into the exposure zone by a constant magnetic field, are captured by the concentrate structure formed in this section I. In this case, the drift of ferromagnetic particles is more significant, compared with the previous version of the pulp supply. This provides, in addition to increasing the rate of formation of the precipitating structure-concentrate and the strength of the flocs formed during its formation, increasing the length of the gold recovery zone, and thus, in general, increasing the efficiency of its extraction.

 The device for extracting gold includes (figure 4) an endless tape (tape gateway) 1, placed on the reels 2 and 3 mounted on the frame 4 with the possibility of rotation, so that the upper branch of the tape is inclined to the horizon, the drive 5 for continuous movement of the tape .

 Under the upper branch of the tape 1 in the upper part there is a magnetic system 6 to create an alternating magnetic field; in the middle part, an intermediate drum 7 mounted on the frame 4 also with the possibility of rotation; in the lower part there is an additional magnetic system to create a constant magnetic field.

 The magnetic system 6 to create an alternating magnetic field can be made either in the form of electromagnets, which are supplied with alternating current, or include moving permanent magnets (see application UK 2139119, patent 571597, Australia).

 Additional magnetic system 8 includes a number of magnetic elements forming a flexible endless chain, and covers the lower 2 and intermediate 7 drums under the tape 1.

 Above the upper branch of the tape 1, in the middle part, there is placed a means for feeding the pulp 9, in the upper part there is a means for supplying water, including a water supply 10, a regulating apparatus 11 and sprayed 12.

 Under the upper drum 3 is placed a means for receiving the concentrate 13, under the lower drum 2 is a means for receiving the tails 14.

 The device operates as follows.

 On the inclined upper branch of the tape 1, under the action of the drive 5 is constantly moving upward, the original product is fed in the form of pulp using means 9.

 Under the influence of a constant magnetic field created by the magnetic elements of the additional magnetic system 8, a precipitation structure is formed on the surface of the tape 1 from the ferromagnetic particles contained in the pulp. Due to the fact that this structure is formed by ferromagnetic particles that are flocculated in a magnetic field, it has an increased capture capacity, which leads to the effective deposition of gold particles on it. Due to the interaction of the additional magnetic system 8 with the tape 1, in the area from the lower 2 to the intermediate 7 of the drum, the magnetic elements creating a constant magnetic field move synchronously with the tape, therefore, the precipitating concentrate structure is not subjected to periodic restructuring, therefore, the sedimentary structure is not washed out particles, including gold.

 After moving with the tape 1 of the concentrate structure into the zone of action of the alternating magnetic field created by the magnetic system 6, this structure is converted into a vibroflocculation state. The water supplied through the water supply system 10, the regulating apparatus 11 and sprayed 12 flushes light minerals and, in part, gold particles and ferromagnetic minerals from the concentrate structure and, thus, the concentrate is cleaned.

 When rounding the upper drum 3, the purified concentrate is discharged into a means for receiving the concentrate 13, from where it is sent for refinement.

 The particles washed out during the purification of the concentrate are carried by a stream of water to the lower section of the upper branch of the belt 1, into the zone of influence of a constant magnetic field created by an additional magnetic system 8, where gold particles and ferromagnetic particles are recovered in the concentrate. At the same time, the demolition of ferromagnetic particles to this section provides an increase in the rate of formation of the concentrate structure, an increased strength of the flocs formed from the ferromagnetic particles, and, as a result, an increase in gold recovery.

 Light minerals (tails) with pulp, rounding the lower drum 2, are sent to the means for receiving tails 14.

 Thus, the use of the proposed method for the extraction of gold and a device for its implementation, due to exposure to the lower portion of the upper branch of the tape with a constant magnetic field, while the magnetic elements creating it are moved synchronously with the tape, provides efficient extraction of gold from the stream into the precipitating structure-concentrate and transportation the latter into the zone of exposure to an alternating magnetic field without periodic restructuring and, accordingly, without loss of gold. In addition, a slight drift of ferromagnetic particles from the zone of influence of an alternating magnetic field (sweep) on the lower section of the upper branch of the tape provides an increased content of the magnetic fraction in the pulp and, as a result, an increase in gold recovery.

Claims (2)

 1. A method of extracting gold, including feeding the pulp to the inclined upper branch of a moving endless belt, exposing the pulp to an alternating magnetic field to form a precipitating structure from the ferromagnetic particles contained in the pulp on the upper branch of the tape, simultaneously depositing gold on this structure, unloading the concentrate, characterized in that in the lower section of the upper branch they act on the pulp with a constant magnetic field, while the magnetic elements creating this field are moved synchronously with the tape.  2. A device for extracting gold, including an endless tape installed on the drums, the upper branch of which is inclined to the horizon, a drive, a magnetic system for creating an alternating magnetic field located under the upper branch of the tape, means for supplying pulp, water and receiving concentrate, characterized in that it is equipped with an additional magnetic system and an intermediate drum, while the latter is located under the upper branch of the tape, and the additional magnetic system includes a number of magnetic elements forming a flexible an endless chain spanning the lower and intermediate drums under the belt.

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