FR2564749A1 - Process and installation for the treatment of gold ore - Google Patents

Process and installation for the treatment of gold ore Download PDF

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Publication number
FR2564749A1
FR2564749A1 FR8408008A FR8408008A FR2564749A1 FR 2564749 A1 FR2564749 A1 FR 2564749A1 FR 8408008 A FR8408008 A FR 8408008A FR 8408008 A FR8408008 A FR 8408008A FR 2564749 A1 FR2564749 A1 FR 2564749A1
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Prior art keywords
suspension
ore
pulp
liquid
recycled
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Granted
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FR8408008A
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French (fr)
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FR2564749B1 (en
Inventor
Jean-Luc Lambert
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Fives Cail Babcock SA
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Fives Cail Babcock SA
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Priority to FR8408008A priority Critical patent/FR2564749B1/en
Priority to ZA851554A priority patent/ZA851554B/en
Publication of FR2564749A1 publication Critical patent/FR2564749A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B13/00—Control arrangements specially adapted for wet-separating apparatus or for dressing plant, using physical effects
    • B03B13/005—Methods or arrangements for controlling the physical properties of heavy media, e.g. density, concentration or viscosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/44—Application of particular media therefor
    • B03B5/447—Application of particular media therefor recovery of heavy media
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

The invention relates to the preliminary treatment of gold ore with a view to the production of a pulp from which the gold is extracted by the process known by the name of "carbon in pulp". In order to reduce gold losses due to the presence of mining timber in the ore and to improve the operation of the grinding and classifying equipment, the ore is subjected to a densimetric separation in a liquid medium whose density lies between that of timber and that of the ore, the sunk matter is subjected to wet grinding in order to produce a pulp and the floating matter to screening in order to recover the liquid medium containing very fine particles of ore in suspension, only a part of this suspension, which is used as a liquid separation medium, is recycled and the other part is mixed with the pulp produced by the grinder, the amount (flow) of recycled suspension being adjusted in order to keep its particle content at a predetermined value.

Description

La présente invention concerne le traitement préliminaire des minerais d'or en vue de la production d'une pulpe d'où l'or est extrait par le procédé connu sous le nom de "carbon in pulp". Actuellement, ce traitement consiste à soumettre le minerai tout-venant ou préalablement concassé à un broyage humide et à une classification granulométrique pour produire une pulpe ne contenant que des très fines particules de minerai. The present invention relates to the preliminary treatment of gold ores for the production of a pulp from which the gold is extracted by the process known as "carbon in pulp". Currently, this treatment consists in subjecting the ore, coming or previously crushed, to a wet grinding and to a grading classification to produce a pulp containing only very fine particles of ore.

On a constaté que la présence dans la pulpe de fibres ligneuses produites par broyage des morceaux de bois de mine mélangés au minerai était nuisible au rendement du procédé. It was found that the presence in the pulp of wood fibers produced by grinding pieces of mine wood mixed with the ore was detrimental to the yield of the process.

Le seul moyen connu pour séparer les bois du minerai avant broyage est le triage manuel qui est aléatoire. The only known way to separate the wood from the ore before crushing is manual sorting which is random.

On a également proposé de séparer les fibres ligneuses de la pulpe, après broyage, sur des cribles spéciaux, le plus souvent en plusieurs étapes, mais cette solution ne donne que des résultats imparfaits, la séparation des fibres de la pulpe étant très difficile.It has also been proposed to separate the woody fibers from the pulp, after grinding, on special screens, usually in several stages, but this solution gives only imperfect results, the separation of the fibers from the pulp being very difficult.

Le but de la présente invention est d'éliminer tout le bois contenu dans le minerai tout-venant et par voie de conséquence de diminuer les pertes en or et améliorer le fonctionnement des appareils de broyage et de classification. The object of the present invention is to eliminate all the wood contained in the general ore and consequently reduce the gold losses and improve the functioning of the grinding and classification apparatus.

Le procédé objet de la présente invention est carac térisé en ce que, avant broyage, on soumet le minerai à une séparation densimétrique dans un milieu liquide dont la densité est comprise entre celle des bois et celle du minerai, en ce que les produits lourds (plongeants) sont soumis à un broyage humide pour produire de la pulpe, en ce que les produits légers (flottants) sont soumis à un criblage pour récupérer le milieu liquide contenant en suspension des très fines particules de minerai, en ce qu'une partie seulement de cette suspension est recyclée pour être utilisée comme milieu liquide de séparation et l'autre partie est mélangée à la pulpe produite par le broyeur, le débit de suspension recyclée étant réglé pour maintenir sa teneur en particules à une valeur pré- déterminée.On utilise comme liquide de l'eau et la teneur en particules de la suspension recyclée est généralement maintenue au-dessous d'un seuil prédéterminée pour que sa densité reste voisine de 1. Cependant, dans le cas de bois de mines de densité supérieure à 1, la densité de la suspension sera maintenue à a une valeur plus élevée, comprise entre celles des bois et des minerais, et choisie pour obtenir une séparation efficace. The process which is the subject of the present invention is characterized in that, before grinding, the ore is subjected to a densimetric separation in a liquid medium, the density of which is between that of wood and that of ore, in that the heavy products ( plungers) are subjected to wet grinding to produce pulp, in that the light products (floating) are subjected to screening to recover the liquid medium containing in suspension very fine particles of ore, in that only a part of this suspension is recycled to be used as liquid separation medium and the other part is mixed with the pulp produced by the mill, the flow rate of recycled suspension being adjusted to maintain its particle content at a predetermined value. as a liquid in water and the particle content of the recycled suspension is generally kept below a predetermined threshold so that its density remains close to 1. However, in the in the case of mine timber with a density greater than 1, the density of the suspension will be kept at a higher value, between that of timber and ores, and chosen to obtain an effective separation.

Pour la mise en oeuvre de ce procédé, on utilisera, outre les appareils classiques de concassage, de broyage et de classification granulométrique, un appareil de séparation densimétrique, un crible pour séparer les produits flottants du liquide contenant en suspension des fines particules de minerai, un distributeur permettant de diviser le courant total de suspension provenant du crible en deux courants partiels et de régler le rapport des débits de ces deux courants partiels, et des moyens pour recycler l'un des courants de suspension dans lwap- pareil de séparation densimétrique et pour mélanger lwau- tre courantde suspension à la pulpe sortant de l'appareil de broyage.Un système de régulation des débits partiels de suspension agissant sur le distributeur peut être prévu pour maintenir la densité de la suspension recyclée égale à une valeur de consigne. For the implementation of this process, in addition to the conventional crushing, grinding and particle size classification apparatuses, a densimetric separation apparatus, a screen for separating the floating products from the liquid containing in suspension fine particles of ore, a distributor making it possible to divide the total suspension stream coming from the screen into two partial streams and to adjust the ratio of the flow rates of these two partial streams, and means for recycling one of the suspension streams into the densimetric separation device and to mix the other suspension stream with the pulp leaving the grinding apparatus. A system for regulating the partial suspension flow rates acting on the distributor can be provided to keep the density of the recycled suspension equal to a set value.

On utilisera avantageusement un appareil de séparation densimétrique du type comprenant un bac surun côté duquel est placée une roue oblique plongeant dans le bac et munie de pales releveuses des produits plongeants et des moyens pour évacuer les produits flottants avec le liquide. Use will advantageously be made of a densimetric separation device of the type comprising a tank on one side of which is placed an oblique wheel plunging into the tank and provided with lifting blades for the plunging products and means for discharging the floating products with the liquid.

La description qui suit se réfère au dessin l'accompagnant qui est un schéma, donné à titre d'exemple non limitatif, d'une installation de traitement d'un minerai d'or suivant l'invention. The following description refers to the accompanying drawing which is a diagram, given by way of nonlimiting example, of a plant for processing a gold ore according to the invention.

Cette installation comprend essentiellement un concasseur primaire a, un appareil de séparation densimétrique 2, un crible 3, un broyeur 6 et un appareil de classification granulométrique 9.  This installation essentially comprises a primary crusher a, a densimetric separation device 2, a screen 3, a crusher 6 and a particle size classification device 9.

Le concasseur, le broyeur et le crible sont des appareils classiques. L'appareil de séparation densimétrique 2 est du type décrit dans le brevet français nO 83/10 728 et est constitué par un bac 21 rempli d'un milieu liquide et sur le côté duquel est disposée obliquement une roue 22 munie de pales releveuses 23 qui remontent les produits plongeants du fond du bac pour les déverser dans une goulotte alimentant un transporteur. The crusher, the shredder and the screen are conventional devices. The densimetric separation device 2 is of the type described in French patent No. 83/10 728 and is constituted by a tank 21 filled with a liquid medium and on the side of which is disposed obliquely a wheel 22 provided with lifting blades 23 which raise the plunging products from the bottom of the tank to pour them into a chute supplying a conveyor.

Les produits flottants sont évacués avec le milieu liquide par débordement ; cette évacuation peut être aidée par des moulinets.The floating products are evacuated with the liquid medium by overflow; this evacuation can be helped by reels.

Le minerai brut tout-venant de la mine contenant une proportion variable de bois sous la forme de buches de 20cm à im de longueur et d'un diamètre de 5 à 20cm environ est tout d'abord concassé dans le concasseur 1 dans certain cas, on peut se dispenser de cette opération. Le minerai est ensuite déversé dans le bac de 1lA pareil de séparation. Les particules de minerai tombent au fond du bac et sont relevées, égouttées et évacuées au moyen de la roue 22. Les bois flottent et sont évacués avec le milieu liquide par débordement ; ils sont ensuite égouttés et éventuellement rincés sur le crible 3.Le liquide d'égouttage et de rinçage éventuel est divisé en deux courants au moyen d'un distributeur 12 ; l'un des courants alimente un bassin 4 et est recyclé dans le bac de l'appareil 2 au moyen d'une pompe 5, tandis que l'autre courant est mélangé à la pulpe sortant du broyeur 6 dans un bassin 7, ce mélange étant envoyé dans l'appa reil de classification 9 par une pompe 8. Le distributeur 12 est constitué par un bac divisé en deux compartiments par une cloison verticale. Le liquide égouttage est déversé au-dessus de cette cloison au moyen d'un organe 13, tel qu'un tuyau souple ou une auge basculante agencé pour permettre de déplacer l'axe du jet ou le plan médian de la lame liquide, respectivement, transversalement à la cloison et de modifier ainsi les débits des deux courants.  The raw ore coming from the mine containing a variable proportion of wood in the form of logs from 20cm to im in length and with a diameter of about 5 to 20cm is first crushed in crusher 1 in some cases, we can dispense with this operation. The ore is then poured into the same 1lA separation tank. The ore particles fall to the bottom of the tank and are lifted, drained and evacuated by means of the wheel 22. The wood floats and is evacuated with the liquid medium by overflow; they are then drained and optionally rinsed on the screen 3. The drainage and possible rinsing liquid is divided into two streams by means of a distributor 12; one of the streams feeds into a tank 4 and is recycled to the tank of the device 2 by means of a pump 5, while the other stream is mixed with the pulp leaving the grinder 6 in a tank 7, this mixture being sent to the classification device 9 by a pump 8. The distributor 12 consists of a container divided into two compartments by a vertical partition. The draining liquid is poured over this partition by means of a member 13, such as a flexible pipe or a tilting trough arranged to allow the jet axis or the median plane of the liquid blade to be displaced, respectively, transversely to the partition and thus modify the flow rates of the two streams.

Le liquide débordant du bac contient en suspension des particules de minerai ultrafines. La densité du liquide recyclé dépend de sa teneur en particules et si celle-ci est trop élevée le fonctionnement de l'appareil 2 risque d'être perturbé. Pour lwéviter, on règle le rapport des débits des deux courants de liquide au moyen de l'organe 13 du distributeur 12 de façon à maintenir la teneur en particules du liquide recyclé au-dessous d'une valeur maximale prédéterminée. Le débit de liquide prélevé sur le circuit de l'appareil de séparation 2 pour être envoyé dans le bassin 7 est compensé par un appoint d'eau dans le bassin 4. The liquid overflowing from the tank contains suspended particles of ultrafine ore. The density of the recycled liquid depends on its particle content and if it is too high the operation of the device 2 may be disturbed. To avoid this, the ratio of the flow rates of the two liquid streams is adjusted by means of the member 13 of the distributor 12 so as to keep the particle content of the recycled liquid below a predetermined maximum value. The flow of liquid taken from the circuit of the separation device 2 to be sent to the tank 7 is compensated by an addition of water in the tank 4.

Certains bois de mine d'une densité légèrement supérieure à l ne flottent pas sur de l'eau douce ou même salée (eau de mer). Dans ce cas, on augmentera la teneur en particules ultrafines du liquide recyclé de façon que sa densité soit supérieure à celle du bois ; un régulateur il associé à un densimètre 10 permettra de maintenir cette densité à une valeur de consigne en agissant sur l'organe de réglage 13 du distributeur 12. Some mine woods with a density slightly higher than l do not float on fresh or even salt water (sea water). In this case, the content of ultrafine particles in the recycled liquid will be increased so that its density is greater than that of wood; a regulator 11 associated with a hydrometer 10 will make it possible to maintain this density at a set value by acting on the adjusting member 13 of the distributor 12.

Des moyens équivalents à ceux décrits pourraient évidemment leur être substitués pour remplir les mêmes fonctions et il est bien entendu que les modifications qui en résulteraient entrent dans le cadre de l'invention.  Means equivalent to those described could obviously be substituted for them to fulfill the same functions and it is understood that the modifications which would result therefrom fall within the scope of the invention.

Claims (6)

REVENDICATT ONS  CLAIMS ONS 1. Procédé de traitement de minerai d'or contenant des bois consistant à soumettre le minerai tout-venant ou préalablement concassé à une séparation densimétrique dans un milieu liquide dont la densité est comprise entre celle des bois et celle du minerai, à soumettre les produits lourds (plongeants) à un broyage humide pour produire une pulpe, à soumettre les produits légers (flottants) à un criblage pour récupérer le milieu liquide contenant en suspension des très fines particules de minerai, à recycler une partie de cette suspension pour l'utiliser comme milieu liquide de séparation, à mélanger l'autre partie de la suspension à ladite pulpe et à régler le débit de suspension recyclée en fonction de sa teneur en particules. 1. Process for treating gold ore containing woods consisting in subjecting the ore coming from or coming from previously crushed to a densimetric separation in a liquid medium whose density is between that of wood and that of ore, to subject the products heavy (plunging) to a wet grinding to produce a pulp, to subject the light (floating) products to a screening to recover the liquid medium containing in suspension very fine particles of ore, to recycle part of this suspension to use it as liquid separation medium, mixing the other part of the suspension with said pulp and adjusting the flow rate of recycled suspension as a function of its particle content. 2. Procédé selon la revefidication l, caractérisé en ce que le débit de suspension recyclée est réglé pour maintenir sa teneur en particules inférieure à une valeur maximale prédéterminée.2. Method according to revefidication l, characterized in that the flow rate of recycled suspension is adjusted to keep its content of particles less than a predetermined maximum value. 3. Procédé selon la revendication l, caractérisé en ce que le débit de suspension recyclée est réglé pour maintenir sa densité égale à une valeur prédéterminée;3. Method according to claim l, characterized in that the flow rate of recycled suspension is adjusted to maintain its density equal to a predetermined value; 4. Installation pour le traitement de minerai d'or comprenant un appareil de broyage humide (6) et un appareil de classification (9) caractérisée en ce qu'elle comprend en outre un appareil de séparation densimétrique (2), un crible (3) pour séparer les produits flottants du liquide contenant en suspension des fines particules de minerai, un distributeur (12) permettant de diviser le courant total de suspension provenant du crible en deux courants partiels et de régler le rapport des débits de ces deux courants partiels, et des moyens pour renvoyer l'un des courants partiels dans ledit appareil de séparation dénsimétrique (2) et pour mélanger l'autre courant partiel à la pulpe sortant de l'appareil de broyage (6).4. Installation for processing gold ore comprising a wet grinding device (6) and a classification device (9) characterized in that it further comprises a densimetric separation device (2), a screen (3 ) to separate the floating products from the liquid containing in suspension fine particles of ore, a distributor (12) making it possible to divide the total suspension current coming from the screen into two partial streams and to regulate the ratio of the flows of these two partial streams, and means for returning one of the partial streams to said denimetric separation device (2) and for mixing the other partial stream with the pulp leaving the grinding device (6). 5. Installation selon la revendication 4, caractérisée en ce qu'elle comprend un système de régulation (11) commandant le distributeur (12) pour maintenir la densité du courant de suspension recyclée, qui est mesurée par un densimètre (lO) égale à une valeur de consigne.5. Installation according to claim 4, characterized in that it comprises a regulation system (11) controlling the distributor (12) to maintain the density of the stream of recycled suspension, which is measured by a density meter (lO) equal to a setpoint. 6. Installation selon la revendication 4 ou 5, caractérisée en ce que l'appareil de séparation densimétrique (2) comporte un bac (21) sur un côté duquel est disposée obliquement une roue (22) plongeant dans le bac et munie de pales releveuses (23) et des moyens pour évacuer les produits flottants avec le liquide. 6. Installation according to claim 4 or 5, characterized in that the densimetric separation device (2) comprises a tank (21) on one side of which is disposed obliquely a wheel (22) dipping into the tank and provided with lifting blades (23) and means for discharging the floating products with the liquid.
FR8408008A 1984-05-23 1984-05-23 PROCESS AND PLANT FOR THE PROCESSING OF GOLD ORES Expired FR2564749B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8408008A FR2564749B1 (en) 1984-05-23 1984-05-23 PROCESS AND PLANT FOR THE PROCESSING OF GOLD ORES
ZA851554A ZA851554B (en) 1984-05-23 1985-02-28 Process and installation for the treatment of gold ores

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Application Number Priority Date Filing Date Title
FR8408008A FR2564749B1 (en) 1984-05-23 1984-05-23 PROCESS AND PLANT FOR THE PROCESSING OF GOLD ORES

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FR2564749A1 true FR2564749A1 (en) 1985-11-29
FR2564749B1 FR2564749B1 (en) 1986-09-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2496891C1 (en) * 2012-03-12 2013-10-27 Сергей Владимирович Бордунов Method for extraction of gold from clay ore and technogenic raw material

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675966A (en) * 1945-06-21 1954-04-20 Bolidens Gruv Ab Grinding and hindered settling classification of naturally occurring ores, etc. by density inducing constituents derived from the ore itself
FR1117390A (en) * 1954-01-11 1956-05-22 Carves Simon Ltd Advanced coal or ore washing plant
FR1238362A (en) * 1959-06-30 1960-08-12 Improvements in density separation devices, in particular gold ores
FR1250971A (en) * 1960-03-10 1961-01-13 Schuechtermann & Kremer Separator tank, usable in particular to separate wood from the minerals with which it is mixed
FR2344337A1 (en) * 1976-03-19 1977-10-14 Alsthom Cgee Wet crushing process for ore - has fines treated in separators with water cleaning and recycling for coarse crushing
FR2484867A1 (en) * 1980-06-20 1981-12-24 Guillaume Jean Paul Extraction equipment for heavy precious metals - held in sand as grains using three progressive sepn. methods including washing
DE3048653A1 (en) * 1980-12-23 1982-07-22 Klöckner-Humboldt-Deutz AG, 5000 Köln Inclined wheel coal separator - has raw coal charged in dense liquid middle part with floating fraction moving along wheel slope

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675966A (en) * 1945-06-21 1954-04-20 Bolidens Gruv Ab Grinding and hindered settling classification of naturally occurring ores, etc. by density inducing constituents derived from the ore itself
FR1117390A (en) * 1954-01-11 1956-05-22 Carves Simon Ltd Advanced coal or ore washing plant
FR1238362A (en) * 1959-06-30 1960-08-12 Improvements in density separation devices, in particular gold ores
FR1250971A (en) * 1960-03-10 1961-01-13 Schuechtermann & Kremer Separator tank, usable in particular to separate wood from the minerals with which it is mixed
FR2344337A1 (en) * 1976-03-19 1977-10-14 Alsthom Cgee Wet crushing process for ore - has fines treated in separators with water cleaning and recycling for coarse crushing
FR2484867A1 (en) * 1980-06-20 1981-12-24 Guillaume Jean Paul Extraction equipment for heavy precious metals - held in sand as grains using three progressive sepn. methods including washing
DE3048653A1 (en) * 1980-12-23 1982-07-22 Klöckner-Humboldt-Deutz AG, 5000 Köln Inclined wheel coal separator - has raw coal charged in dense liquid middle part with floating fraction moving along wheel slope

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2496891C1 (en) * 2012-03-12 2013-10-27 Сергей Владимирович Бордунов Method for extraction of gold from clay ore and technogenic raw material

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ZA851554B (en) 1985-10-30
FR2564749B1 (en) 1986-09-12

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