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CN-116174162-B - Slime inhibitor and sulphide ore floatation process

CN116174162BCN 116174162 BCN116174162 BCN 116174162BCN-116174162-B

Abstract

The invention provides a slime inhibitor and a sulphide ore floatation process. The slime inhibitor comprises acrylamide-sodium styrene sulfonate copolymer and poly-2-hydroxy acrylic acid and/or poly-2-hydroxy sodium acrylate. In the flotation operation, the slime inhibitor can be adsorbed on the surface of the slime with positive charges on the surface and can be adsorbed at a plurality of sites so as to inhibit the floatation of the slime, and meanwhile, hydrophilic groups hydroxyl, carboxyl, amido and sulfonic groups in the components can form hydrogen bonds with water molecules and form a layer of water film on the surface of the slime, so that the dispersibility of the slime in water is favorably improved, the risk of adverse effects on the floatation of sulphide ores is further reduced, and the grade of concentrate and the recovery rate of valuable metals are improved. The slurry inhibitor containing the specific components can be applied to the floatation process of the sulphide ores, so that the components are interpenetrated and adsorbed on the surface of the slurry, and the synergistic effect among the components is exerted, so that the grade of the concentrate and the recovery rate of valuable metals can be improved.

Inventors

  • LIU ZHIGUO
  • YU CHUANBING
  • WANG CHUANLONG
  • SONG LEI
  • GUO SUHONG
  • KANG JINXING
  • WANG XIN
  • WANG YAYUN

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
20260508
Application Date
20230210

Claims (11)

  1. 1. The mineral mud inhibitor is characterized by comprising an acrylamide-sodium styrene sulfonate copolymer and poly (2-hydroxy acrylic acid) and/or poly (2-hydroxy sodium acrylate), wherein the acrylamide-sodium styrene sulfonate copolymer is obtained by polymerization reaction of an acrylamide monomer and a sodium styrene sulfonate monomer, and the mass ratio of the acrylamide monomer to the sodium styrene sulfonate monomer is (8-10): 1; When the slime inhibitor comprises the poly (2-hydroxy acrylic acid) and the acrylamide-sodium styrene sulfonate copolymer, the ratio of the number average molecular weight of the poly (2-hydroxy acrylic acid) to the number average molecular weight of the acrylamide-sodium styrene sulfonate copolymer is (1000-4000): (3000-5000); When the slime inhibitor comprises the poly-2-sodium hydroxy acrylate and the acrylamide-sodium styrene sulfonate copolymer, the ratio of the number average molecular weight of the poly-2-sodium hydroxy acrylate to the number average molecular weight of the acrylamide-sodium styrene sulfonate copolymer is (1000-4000): (3000-5000); When the slime inhibitor comprises the poly (2-hydroxy acrylic acid), the poly (2-hydroxy acrylic acid) sodium salt and the acrylamide-sodium styrene sulfonate copolymer, the ratio of the number average molecular weight of the poly (2-hydroxy acrylic acid), the poly (2-hydroxy acrylic acid) sodium salt and the acrylamide-sodium styrene sulfonate copolymer is (1000-4000): 3000-5000.
  2. 2. The mineral mud inhibitor according to claim 1, wherein the weight ratio of the acrylamide-sodium styrene sulfonate copolymer to the poly 2-hydroxy acrylic acid and/or the poly 2-hydroxy sodium acrylate is 100 (40-80).
  3. 3. The slime inhibitor of claim 2, wherein the weight ratio of poly 2-hydroxy acrylic acid to poly 2-hydroxy sodium acrylate is (20-40): 60-80.
  4. 4. The slime inhibitor according to any one of claims 1 to 3, wherein the number average molecular weight of the acrylamide-sodium styrene sulfonate copolymer is 1000 to 5000; The number average molecular weight of the poly (2-hydroxy acrylic acid) and the number average molecular weight of the poly (2-hydroxy sodium acrylate) are respectively and independently selected from 1000-5000.
  5. 5. A sulphide ore flotation process, the sulphide ore flotation process comprising: Step S1, grinding the sulphide ore to obtain ore pulp; Step S2, mixing the ore pulp with a first slime inhibitor, a first mineral collector and a foaming agent, and roughing to obtain roughing concentrate and first tailings, wherein the first slime inhibitor is the slime inhibitor of any one of claims 1 to 4; Step S3, mixing and concentrating the rougher concentrate and a second slurry inhibitor to obtain concentrate and second tailings, wherein the second slurry inhibitor can be the same as or different from the first slurry inhibitor, and And S4, mixing the second tailings with a second mineral collector, and scavenging to obtain third tailings and scavenging foam.
  6. 6. The sulphide ore flotation process according to claim 5, wherein mineral particles with a particle size of less than 0.074mm account for 65-75% of the sulphide ore, the pulp having a solids content of 25-30 wt% based on the weight of the pulp.
  7. 7. The sulphide ore flotation process according to claim 5 or 6, wherein the weight ratio of the first slurry inhibitor to the sulphide ore is (0.2 to 1) 1000, the weight ratio of the first mineral collector to the sulphide ore is (0.06 to 0.1) 1000, and the weight ratio of the frother to the sulphide ore is (0.02 to 0.04) 1000.
  8. 8. A sulphide ore flotation process according to claim 7 wherein, The first mineral collector and the second mineral collector are each independently selected from one or more of the group consisting of ethyl xanthate, butyl xanthate, and isopropyl xanthate; The foaming agent is selected from one or more of methyl isobutyl carbinol, dimethylbenzyl alcohol and pinitol oil.
  9. 9. The sulphide ore flotation process according to claim 5 or 6, wherein step S2 further comprises mixing the pulp with the first slurry inhibitor, the first mineral collector and the frother and performing a first rougher, a second rougher and a third rougher in that order to obtain the rougher concentrate and the first tailings; The step S3 further comprises the steps of mixing the roughing concentrate with the second slime inhibitor and sequentially carrying out first concentration, second concentration and third concentration to obtain the concentrate; the step S4 further comprises the steps of mixing the second tailings with the second mineral collector, and sequentially carrying out first scavenging and second scavenging to obtain the third tailings and scavenging foam.
  10. 10. The sulphide ore flotation process according to claim 9, wherein the scavenger froth is recycled in step S4 or step S2.
  11. 11. The sulphide ore flotation process according to claim 9, wherein the sulphide ore comprises 5 to 30wt% dolomite, 5 to 15wt% chlorite, 5 to 15wt% kaolin and 5 to 30wt% other sliminess, based on the weight percentage of the sulphide ore.

Description

Slime inhibitor and sulphide ore floatation process Technical Field The invention relates to the technical field of mineral separation, in particular to a slime inhibitor and a sulphide ore floatation process. Background When the ore contains more easily-slimed minerals (such as kaolin, chlorite, mica, calcite, dolomite, etc.), the ore easily forms a great amount of fine mud after grinding. In the beneficiation category, mineral particles having a particle size of less than 10 μm may be referred to as fine mud (or slimes). If more mineral mud is in the flotation pulp, more negative effects are brought to the flotation. The method mainly comprises the following steps of (1) enabling fine mud to be easily mixed in a foam product to reduce the grade of concentrate, (2) enabling the fine mud to be easily covered on the surface of useful minerals to influence the action of medicaments and the useful minerals, (3) enabling the fine mud to easily adsorb a large amount of medicaments to increase medicament consumption, and (4) enabling ore pulp to be sticky and the inflation condition to be influenced. In order to eliminate or weaken the negative influence of the mineral mud, the conventional methods include (1) adding a dispersing or suppressing agent to disperse the mineral mud, (2) removing the mineral mud by adopting a desliming mode, wherein the conventional methods include mechanical desliming and flotation desliming, but the method has a certain influence on the recovery rate of target minerals, (3) improving the flotation operation conditions, such as staged batch dosing, avoiding the sticky thickening of a foam layer, reducing the consumption of the medicament by the mineral mud, and also adopting a thinner flotation concentration to reduce the viscosity of the mineral mud and reduce the mechanical inclusion of the mineral mud. The most common method is to add a slime dispersing agent or inhibitor, and the currently common medicaments are sodium silicate, sodium hexametaphosphate, carboxymethyl cellulose, polyacrylamide, polyacrylic acid and other medicaments. However, the dispersing and inhibiting ability of the agent to the slurry is required to be improved, and once the slurry amount in the slurry is relatively high, the inhibiting effect of the agent to the slurry is reduced. Therefore, it is necessary to research and develop a slime inhibitor and sulphide ore flotation process suitable for high slime amount, which has important significance for improving concentrate grade and valuable metal recovery rate of the sulphide ore flotation process. Disclosure of Invention The invention mainly aims to provide a slime inhibitor and a sulphide ore floatation process, which are used for solving the problems that the existing slime inhibitor has poor inhibiting effect on slime and further causes low concentrate grade and valuable metal recovery rate. In order to achieve the above object, the present invention provides, in one aspect, a sludge inhibitor comprising an acrylamide-sodium styrene sulfonate copolymer and poly 2-hydroxy acrylic acid and/or poly 2-hydroxy sodium acrylate. Further, the weight ratio of the acrylamide-sodium styrene sulfonate copolymer to the poly (2-hydroxy acrylic acid) and/or the poly (2-hydroxy sodium acrylate) is 100 (40-80), and preferably the weight ratio of the poly (2-hydroxy acrylic acid) to the poly (2-hydroxy sodium acrylate) is 20-40 (60-80). Further, the number average molecular weight of the acrylamide-sodium styrene sulfonate copolymer is 1000-5000, and the number average molecular weights of the poly (2-hydroxy acrylic acid) and the poly (2-hydroxy sodium acrylate) are respectively and independently selected from 1000-5000. The acrylamide-sodium styrene sulfonate copolymer is obtained by polymerization reaction of an acrylamide monomer and a sodium styrene sulfonate monomer, and the mass ratio of the acrylamide monomer to the sodium styrene sulfonate monomer is (8-10): 1. Further, when the sludge inhibitor includes a poly (2-hydroxyacrylic acid) and an acrylamide-sodium styrene sulfonate copolymer, the ratio of the number average molecular weight of the poly (2-hydroxyacrylic acid) to the number average molecular weight of the acrylamide-sodium styrene sulfonate copolymer is (1000-4000) to (3000-5000), and when the sludge inhibitor includes a poly (2-hydroxyacrylic acid), a poly (2-hydroxyacrylic acid) and an acrylamide-sodium styrene sulfonate copolymer, the ratio of the number average molecular weight of the poly (2-hydroxyacrylic acid) to the acrylamide-sodium styrene sulfonate copolymer is (1000-4000) to (3000-5000). In order to achieve the above purpose, the application also provides a sulphide ore flotation process, which comprises the steps of S1, grinding sulphide ores to obtain ore pulp, S2, mixing and roughing the ore pulp with a first mineral deposit inhibitor, a first mineral collector and a foaming agent to obtain roughed concentrate and first tailings, wherei