WO2024045687A2 - Procédé de présélection et de rejet et de réduction d'un broyage excessif de minerais d'or - Google Patents

Procédé de présélection et de rejet et de réduction d'un broyage excessif de minerais d'or Download PDF

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Publication number
WO2024045687A2
WO2024045687A2 PCT/CN2023/092980 CN2023092980W WO2024045687A2 WO 2024045687 A2 WO2024045687 A2 WO 2024045687A2 CN 2023092980 W CN2023092980 W CN 2023092980W WO 2024045687 A2 WO2024045687 A2 WO 2024045687A2
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WO
WIPO (PCT)
Prior art keywords
grinding
gold
minerals
grained
discarding
Prior art date
Application number
PCT/CN2023/092980
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English (en)
Chinese (zh)
Other versions
WO2024045687A3 (fr
Inventor
徐超
李光胜
朱幸福
蔡明明
卢中博
陈艳波
吉强
张军童
高腾跃
秦广林
Original Assignee
山东黄金矿业科技有限公司选冶实验室分公司
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Application filed by 山东黄金矿业科技有限公司选冶实验室分公司 filed Critical 山东黄金矿业科技有限公司选冶实验室分公司
Publication of WO2024045687A2 publication Critical patent/WO2024045687A2/fr
Publication of WO2024045687A3 publication Critical patent/WO2024045687A3/fr

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Classifications

    • 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
    • B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
    • 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

Definitions

  • the invention relates to a method for pre-selecting gold mines, discarding waste and reducing over-grinding, and belongs to the technical field of mineral processing.
  • the ore In the grinding and classification circuit, the ore is over-grinded to varying degrees. For those ores with high density, brittleness and brittleness, the degree of over-grinding is even more serious. Over-grinding not only causes a large amount of valuable heavy metals to be lost, but also reduces the production capacity of the grinding machine and increases energy consumption. Over-grinding directly affects the economic benefits of the mineral processing plant. In addition, the sludge phenomenon caused by over-grinding also causes great difficulties in subsequent operations such as sorting and dehydration. Hydraulic classification has fundamental flaws that cannot be overcome by improving equipment parameters and process flow. Therefore, currently adopted measures to improve classification efficiency include the introduction of screening operations, secondary classification, Huji cone hydraulic classifier, Huji Basic screens, etc., play a very limited role in solving the problem of over-grinding of valuable heavy minerals.
  • the invention patent application with publication number CN113634346A involves a method for pre-selecting and discarding non-ferrous metal ores. Its main technical means are: (1) crushing the non-ferrous metal ore raw ore and then performing the first screening and classification to obtain the first coarse ore and the first Fine ore and the first qualified ore; (2) carry out intelligent ore sorting on the first coarse ore to obtain the first coarse concentrate and gangue tailings; (3) crush the first coarse concentrate and carry out the third Second screening and classification, the second fine ore and the second qualified ore are obtained; (4) The first fine ore and the second fine ore are subjected to heavy media beneficiation to obtain concentrate and gangue tailings; the concentrate is qualified mine.
  • this patent is suitable for non-ferrous metal ore raw ore, and the raw ore crushing particle size is relatively coarse.
  • the main element of gold ore resources is gold, and the content is in g/t, and the degree of dissociation is It is not enough to achieve the heavy medium separation effect;
  • this patent combines the particularity of gold resources with the applicability of heavy medium separation, uses cyclone sand settling as the raw material for separation, and relies on process mineralogy analysis to fully resolve the problem.
  • the separated useful minerals and gangue minerals are separated to obtain heavy media separation tailings with a lower gold grade than the flotation tailings.
  • the technical problem to be solved by this invention is to make full use of the close relationship between pyrite and gold minerals, the difference in specific gravity between pyrite and gangue minerals, the easy-to-float property of pyrite, etc., to provide a method with good separation effect. , has strong adaptability to gold mines and can also solve the over-grinding problem of the grinding and grading system.
  • the present invention adopts the following technical solutions:
  • a method for pre-selecting, discarding and reducing over-grinding of gold mines which is characterized by including the following steps:
  • the particle size of the coarse-grained mineral is ⁇ 5 mm.
  • the fine-grained minerals are ⁇ 0.25mm.
  • the intermediate-grade minerals enter the heavy medium separation system, and the heavy medium separation tailings are treated as waste rock.
  • the waste disposal yield is determined according to the Au grade of the tailings, and the Au grade of the tailings is ⁇ 0.15g/t. More preferably ⁇ 0.1g/t, the waste rock is used as construction sand and filling material; the heavy medium separation concentrate is obtained and returned to the ball mill for re-grinding.
  • the Au grade of the tailings is ⁇ 0.1g/t.
  • the heavy medium separation system includes heavy medium liquid preparation, screening and demediation, and magnetic separation and washing.
  • the heavy medium used for separating the heavy medium is ferrosilicon powder.
  • the fine-grained minerals are subjected to flash flotation to obtain high-grade gold concentrate as the product, with a gold grade of ⁇ 60 g/t, and the flash flotation tailings are obtained and returned to the ball mill for re-grinding.
  • the gold ore is a quartz vein type gold ore.
  • the present invention performs particle size classification by classifying the cyclone sand in the closed-circuit grinding and classification system, and by means of a combination of closed-circuit screening, heavy medium separation, and flash flotation, the treatment process of ores of different particle sizes is reasonably designed to achieve coarse
  • the particle size cyclone grit is returned to grinding, the intermediate particle size cyclone grit is discarded and pre-enriched, and the fine-grained product is flash flotated to obtain high-grade gold concentrate.
  • the method provided by the invention can not only realize efficient separation between main useful minerals and gangue minerals in gold mines, significantly reduce the amount of ore entering the flotation process, and save costs; it can also pre-flotate the monomer solution in the closed circuit of grinding and classification.
  • Isolated useful minerals can avoid the continuous accumulation of these minerals in the cyclone classification process due to their specific gravity, causing over-grinding and affecting the Au recovery rate. This will provide technical support for improving the economic benefits of gold mines, green and efficient development of mines, and resource utilization. .
  • this invention Compared with the aforementioned invention patent application with publication number CN113634346A, which involves a method of pre-selecting and discarding non-ferrous metal ores, this invention has the following technical advantages: it is better suited for pre-selecting and discarding of gold ore resources, and the gold grade obtained is lower than that of flotation tailings gold.
  • the high-grade waste tailings have a higher waste yield; and this patent applies pre-waste removal and over-grinding suppression to the same raw material, which is easy to implement and widely used.
  • Figure 1 is a process flow diagram of an embodiment of the present invention.
  • Figure 2 is a graph of the tailings productivity and distribution rate under different density conditions of (-5mm+0.28mm) sample heavy media separation in the embodiment of the present invention.
  • Figure 3 is a graph of the tailings productivity and distribution rate under different density conditions of (-2mm+0.28mm) sample heavy media separation in the embodiment of the present invention.
  • the method of the present invention includes a series of process steps that can be implemented in equipment meeting the required process conditions. As shown in Figure 1, after the raw ore is ground, the product is pumped to the cyclone for classification. The cyclone overflow enters the main flotation operation. After the cyclone sand is screened by a double-layer vibrating screen, coarse-grained minerals and intermediate particles are obtained. grade minerals and fine-grained minerals.
  • Fine-grained minerals enter the flash flotation system the flash flotation concentrate is sold as a product, and the flash flotation tailings are returned to the ball mill;
  • the intermediate grade minerals enter the heavy medium separation system.
  • the heavy medium (ferrosilicon powder) and the intermediate grade minerals are mixed in the heavy medium mixing barrel and pumped into the heavy medium cyclone.
  • the heavy medium separation concentrate is discharged from the cyclone.
  • the underflow is discharged and screened and deinterposed by a linear vibrating screen.
  • the products on the screen are cleaned by a cleaning screen and then fed into the ball mill.
  • the sorted tailings are discharged from the cyclone overflow and screened by a linear vibrating screen. After deintermediation, the products on the screen are cleaned by a cleaning screen. Then thrown out as final tailings.
  • the products screened by the two de-medium vibrating screens are dehydrated and returned to the heavy medium mixing barrel, and the water is recycled.
  • Sorting conditions of heavy medium with sand settling in a mine's cyclone Sorting conditions of heavy medium with sand settling in a mine's cyclone:
  • the heavy media sorting results show:
  • the cyclone sand flash flotation + heavy medium separation situation in a mine The cyclone sand was screened through 5mm and 0.25mm vibrating screens respectively to obtain coarse-grained minerals (>5mm) and intermediate-grained minerals. (0.25-5mm) and fine-grained minerals (>0.25mm).
  • the separation medium used is a heavy medium liquid prepared from ferrosilicon powder and water. The results of the heavy media separation test on coarse-grained and intermediate-grained minerals are shown in Table 2.
  • the test results show that: due to insufficient monomer dissociation of coarse-grained minerals, the Au grade of the tailings fluctuates greatly, and a stable tailing product cannot be obtained, so this product needs to be returned to the ball mill for re-grinding; the intermediate-grained grade products are evenly distributed in each particle range. It can obtain better tailing products and lower tailing Au grade ( ⁇ 0.15g/t, lower than the Au grade of flotation tailings).
  • the results of the flotation concentration test show that as the flotation concentration increases, the Au grade and Au recovery rate of the concentrate first increase and then decrease; when the flotation concentration is 55%, the recovery rate is the highest, and when the flotation concentration is 55%, the recovery rate is the highest. At 60%, the concentrate grade is the highest (77.95g/t).

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un procédé de présélection et de rejet et de réduction d'un broyage excessif de minerais d'or. Tout d'abord, du sable stable d'un cyclone dans un système de broyage et de classification de minerai d'or à circulation en boucle fermée est tamisé et classé pour obtenir un minerai à grains grossiers, un minéral à grains intermédiaires et un minéral à grains fins ; le minéral à grains grossiers est ensuite renvoyé à un broyeur à boulets pour un nouveau broyage, le minéral à grains intermédiaires est introduit dans un système de tri à milieu dense, de façon à obtenir un résidu trié en milieu dense, qui est traité en tant que roche usée, et un concentré trié en milieu dense, qui est renvoyé au broyeur à boulets pour un nouveau broyage ; et enfin, le minéral à grains fins est soumis à une flottation instantanée, de façon à obtenir un concentré d'or de qualité élevée en tant que produit, et un résidu de flottation instantanée, qui est renvoyé au broyeur à boulets pour un nouveau broyage. Le procédé peut réaliser une séparation efficace entre un minéral utile principal et un minéral de gangue dans une mine d'or, et réduire de manière significative la quantité de minerais entrant dans le processus de flottation ; et des minéraux utiles dissociés par un monomère dans une boucle fermée de broyage et de classification de minerai peuvent en outre être amenés à flotter à l'avance, ce qui empêche cette partie de minéraux d'être mise en circulation et accumulée en continu pendant un processus de classification par cyclone en raison d'une gravité spécifique importante, et empêche le taux de récupération d'Au d'être affecté par un broyage excessif.
PCT/CN2023/092980 2022-09-01 2023-05-09 Procédé de présélection et de rejet et de réduction d'un broyage excessif de minerais d'or WO2024045687A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202211063076.XA CN115254398B (zh) 2022-09-01 2022-09-01 一种金矿预选抛废和减少过磨的方法
CN202211063076.X 2022-09-01

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WO2024045687A2 true WO2024045687A2 (fr) 2024-03-07
WO2024045687A3 WO2024045687A3 (fr) 2024-04-18

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* Cited by examiner, † Cited by third party
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CN115254398B (zh) * 2022-09-01 2024-06-07 山东黄金矿业科技有限公司选冶实验室分公司 一种金矿预选抛废和减少过磨的方法

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WO2024045687A3 (fr) 2024-04-18
CN115254398A (zh) 2022-11-01
CN115254398B (zh) 2024-06-07

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