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CN-122006907-A - Ore dressing method for clay-containing minerals

CN122006907ACN 122006907 ACN122006907 ACN 122006907ACN-122006907-A

Abstract

The invention relates to the field of ore dressing, and provides an ore dressing method for clay-containing minerals. The beneficiation method comprises the following steps of desliming and gravity separation of clay-containing minerals to obtain fine mud, gravity separation concentrate and gravity separation tailings, and flotation of gravity separation tailings to obtain flotation concentrate and flotation tailings. According to the invention, the ore containing clay mineral is subjected to desliming in advance before floatation, so that the negative influence of fine mud on floatation can be avoided, the recovery rate of gold and silver is improved, the types and the consumption of subsequent beneficiation agents are reduced, and the beneficiation cost is reduced. In addition, the invention performs reselection before flotation, recovers part of gold, accords with the principle of 'early recovery' and plays a role in reducing the ore feeding amount of the subsequent flotation ore, thereby further reducing the dosage of the subsequent beneficiation reagent. The beneficiation method can realize the efficient recovery of gold and silver in the clay-containing mineral ores, and has the advantages of small dosage of medicaments, low beneficiation cost and high recovery rate of gold and silver.

Inventors

  • WANG YAYUN
  • LIU ZHIGUO
  • LI ZHAOFENG
  • KANG JINXING
  • YU CHUANBING
  • DENG CHAOAN
  • WANG XIN

Assignees

  • 中国恩菲工程技术有限公司
  • 中国有色工程有限公司

Dates

Publication Date
20260512
Application Date
20260115

Claims (9)

  1. 1. A method for beneficiating clay-containing minerals, comprising the steps of: S1, desliming and gravity separation are carried out on clay mineral-containing ores to obtain fine mud, gravity separation concentrate and gravity separation tailings; S2, carrying out flotation on the gravity tailings to obtain flotation concentrate and flotation tailings.
  2. 2. The method of beneficiating clay mineral bearing ore according to claim 1, wherein the clay mineral bearing ore of S1 further comprises crushing prior to desliming and reselection; Optionally, the particle size of the crushed ore is <2mm.
  3. 3. The method of beneficiating clay mineral bearing ore according to claim 1 or 2, wherein the clay mineral bearing ore of S1 further comprises grinding prior to desliming and reselection; Optionally, the mass fraction of the ore with the grain diameter less than or equal to 0.074mm in the ore after grinding is 70-85%.
  4. 4. The method for beneficiating clay mineral bearing ore according to claim 1 or 2, wherein the clay mineral bearing ore of S1 further comprises grinding after desliming and reselection; optionally, the mass fraction of the ore with the grain diameter less than or equal to 0.074mm in the ore after grinding is 70-90%.
  5. 5. The method of beneficiating clay mineral bearing ore according to claim 1, wherein the mass fraction of clay mineral in the clay mineral bearing ore of S1 is >25%; Optionally, the clay mineral comprises one or more of kaolinite, montmorillonite and illite.
  6. 6. The method of beneficiating clay mineral containing ore according to claim 1, wherein the flotation of S2 comprises roughing, scavenging, and beneficiating; optionally, the roughing includes a first roughing and a second roughing performed sequentially; optionally, the scavenging includes a first scavenging, a second scavenging and a third scavenging which are sequentially performed; optionally, the beneficiation comprises sequentially performing a first beneficiation and a second beneficiation.
  7. 7. The method of claim 6, wherein the rougher meets at least one of the following conditions: (1) Adding a first activating agent, a first collecting agent and a first foaming agent in the first roughing process; Optionally, the mass ratio of the first activator to the gravity tailings is (20 g-200 g): 1t; optionally, the mass ratio of the first collector to the gravity tailings is (30 g-160 g): 1t; optionally, the mass ratio of the first foaming agent to the gravity tailings is (20 g-60 g) 1t; (2) The time of the first roughing is 4-8 min; (3) Adding a second activating agent, a second collecting agent and a second foaming agent in the second roughing process; Optionally, the mass ratio of the second activator to the ore to be subjected to the second roughing is (15 g-100 g): 1t; optionally, the mass ratio of the second collector to the ore to be subjected to the second roughing is (15 g-80 g): 1t; optionally, the mass ratio of the second foaming agent to the ore to be subjected to the second roughing is (10 g-30 g): 1t; (4) The second roughing time is 4-8 min.
  8. 8. The method of claim 7, wherein the scavenging satisfies at least one of the following conditions: (1) Adding a third collecting agent and a third foaming agent in the first scavenging process; optionally, the mass ratio of the third collector to the ore to be subjected to the first scavenger is (10 g-40 g): 1t; optionally, the mass ratio of the third foaming agent to the ore to be subjected to the first scavenging is (10 g-20 g): 1t; (2) The first scavenging time is 3min-6min; (3) Adding a fourth collecting agent and a fourth foaming agent in the second scavenging process; Optionally, the mass ratio of the fourth collector to the ore to be subjected to the second scavenger is (10 g-20 g): 1t; optionally, the mass ratio of the fourth foaming agent to the ore to be subjected to the second scavenging is (5 g-10 g): 1t; (4) The second scavenging time is 2min-5min; (5) Adding a fifth collecting agent and a fifth foaming agent in the third scavenging process; Optionally, the mass ratio of the fifth collector to the ore to be subjected to the third scavenger is (5 g-10 g): 1t; optionally, the mass ratio of the fifth foaming agent to the ore to be subjected to the third scavenging is (3 g-20 g): 1t; (6) The third scavenging time is 2min-5min.
  9. 9. The method for beneficiation of clay mineral containing ores according to claim 8, wherein the first activator and the second activator independently comprise one or both of copper sulfate and ammonium sulfate, respectively; and/or the first collector, the second collector, the third collector, the fourth collector and the fifth collector respectively comprise one or more of sodium isopropyl xanthate and butylammonium black medicine; And/or the first foaming agent, the second foaming agent, the third foaming agent, the fourth foaming agent and the fifth foaming agent respectively comprise one or more of polyethylene glycol, no. two oil and methyl isobutyl carbinol.

Description

Ore dressing method for clay-containing minerals Technical Field The invention relates to the field of ore dressing, in particular to an ore dressing method of clay-containing minerals. Background Ores containing clay minerals have long faced the difficult problem of high-efficiency recovery of gold and silver due to the high content of clay minerals and severe mud formation. The clay mineral is easy to adsorb on the surface of the gold-carrying mineral, and prevents the clay mineral from acting effectively with the flotation reagent, so that the gold and silver flotation recovery rate is low, and meanwhile, the strong adsorptivity of the clay mineral to the beneficiation reagent can obviously increase the reagent consumption and the beneficiation cost. In the prior art, the fine mud is dispersed and the adhesion interference (medicament blocking effect) to the surface of gold-bearing minerals and the excessive adsorption to the mineral dressing medicaments are inhibited by adding the regulator (sodium carbonate and water glass), but the method still has the problems of unsatisfactory gold and silver flotation recovery effect and high medicament cost. Disclosure of Invention Therefore, the technical problem to be solved by the invention is to overcome the defects of unsatisfactory gold and silver floatation recovery effect and high reagent cost in the ore dressing of clay-containing minerals in the prior art, thereby providing the ore dressing method of the clay-containing minerals. For this purpose, the invention provides the following technical scheme: The invention provides an ore dressing method of clay-containing minerals, which comprises the following steps: S1, desliming and gravity separation are carried out on clay mineral-containing ores to obtain fine mud, gravity separation concentrate and gravity separation tailings; S2, carrying out flotation on the gravity tailings to obtain flotation concentrate and flotation tailings. In an alternative embodiment, the ore of the clay mineral-containing ore includes, but is not limited to, a single gold ore, a silver ore, or a multi-metal ore containing gold and silver. In an alternative embodiment, the grade of gold in the clay mineral containing ore is 1.0g/t-5.0g/t. In an alternative embodiment, the mass fraction of clay mineral in the clay mineral-containing ore of S1 is >25%, and the clay mineral includes one or more of kaolinite, montmorillonite, and illite. In an alternative embodiment, in S1, the clay mineral-containing ore is crushed and ground in sequence, then the ground ore is desliming and reselecting to obtain fine mud, reselected concentrate and reselected tailings, and the reselected tailings are subjected to S2. In an alternative embodiment, the crushed ore has a particle size of <2mm and the mass fraction of ore having a particle size of 0.074mm or less in the ground ore is 70-85%. In an alternative embodiment, in S1, the clay mineral-containing ore is crushed, the crushed ore is desliming and reselecting to obtain fine mud, reselected concentrate and reselected tailings, the reselected tailings are ground, and the ground reselected tailings are subjected to S2. In an alternative embodiment, the crushed ore has a particle size of <2mm and the mass fraction of ore having a particle size of 0.074mm or less in the ore after grinding is 70% to 90%. In an alternative embodiment, the desliming and the reselection are performed in one step or in steps. In an alternative embodiment, the desliming and the gravity separation are performed by a shaking table during one step, tailings obtained by the shaking table are fine mud described in S1, concentrate obtained by the shaking table is gravity separation concentrate described in S1, and middlings obtained by the shaking table are gravity separation tailings described in S1. In an alternative embodiment, when the steps are divided, desliming and reselection are sequentially performed, desliming is performed by adopting a hydrocyclone to obtain desliming ore and fine mud of the step S1, and then the desliming ore is subjected to reselection by adopting a shaking table to obtain the reselection concentrate of the step S1 and the reselection tailings of the step S1. In an alternative embodiment, the flotation in S2 includes roughing, scavenging and beneficiating, the roughing includes sequentially performing first roughing and second roughing, the scavenging includes sequentially performing first scavenging, second scavenging and third scavenging, and the beneficiating includes sequentially performing first beneficiating and second beneficiating. In an alternative embodiment, a first activator, a first collector and a first foaming agent are added in the first roughing process, the mass ratio of the first activator to the gravity tailings is (20 g-200 g): 1t, the mass ratio of the first collector to the gravity tailings is (30 g-160 g): 1t, and the mass ratio of the first foaming agent to the gravity tai