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CN-121972305-A - Flotation antimony removal process for antimony gold concentrate

CN121972305ACN 121972305 ACN121972305 ACN 121972305ACN-121972305-A

Abstract

The invention discloses a flotation and antimony removal process for antimony gold concentrate, belongs to the technical field of ore flotation, and is used for solving the technical problems that gold enrichment performance and antimony removal performance of the antimony gold concentrate flotation in the prior art are to be further improved; according to the invention, a stepwise interface regulation and control system consisting of an arsenic directional collector, an antimony selective collector and a lead chelating dispersant is constructed, and interface substrate reforming, target phase interface recognition strengthening and terminal interface convergence are sequentially realized in ore pulp, so that a flotation layering environment with gradient selectivity is formed.

Inventors

  • LIAO KAIWEN
  • Liao Qinwen
  • LIU SHUPING
  • XIE JINGYANG
  • DENG ZHIBING

Assignees

  • 广东盛祥新材料科技有限公司

Dates

Publication Date
20260505
Application Date
20251229

Claims (10)

  1. 1. The flotation antimony removal process for the antimony gold concentrate is characterized by comprising the following steps of: S1, adding gold concentrate and deionized water into ore grinding equipment, wet grinding until the particle size fraction of 74 μm is 70-80wt%, and adjusting the pH value of ore pulp to be purified to be 6.5-7.0 after grinding to obtain ore pulp; S2, adding ore pulp to be purified into a flotation tank, adding an arsenic directional collector, stirring for 3-5min, adding methyl isobutyl carbinol, floating for 6-8min, and collecting foam as arsenic concentrate to obtain arsenic-removed ore pulp; S3, adding the dearsenified ore pulp into a stirring tank, adjusting the pH value to be 7.0-7.5, adding an antimony selective collector, stirring for 3-5min, adding methyl isobutyl carbinol, floating for 8-10min, and collecting foam to obtain dearsenified and deammonified ore pulp; s4, adding the arsenic-removed and antimony-removed ore pulp into a stirring tank, adjusting the pH value to be 8.0-8.5, adding a lead chelating dispersant, stirring for 5-8min, adding methyl isobutyl carbinol, floating for 4-6min, collecting foam to obtain lead concentrate, and carrying out post-treatment to obtain purified gold concentrate.
  2. 2. The antimony removal process for antimony gold concentrate flotation according to claim 1, wherein in the step S1, the ratio of gold concentrate to deionized water is 30-35 kg/100 g, wherein the gold content is 0.004-0.06wt%, the antimony content is 15-20wt%, the arsenic content is 2-3wt%, and the lead content is 1-2wt%, in the step S2, the ratio of ore pulp to be purified, arsenic directional collector and methyl isobutyl carbinol is 15-25 g/90 g/2 g, in the step S3, the ratio of arsenic removal ore pulp, antimony selective collector and methyl isobutyl carbinol is 30-40 g/80 g/2 g, and in the step S4, the ratio of arsenic removal and antimony removal ore pulp, lead chelating dispersant and methyl isobutyl carbinol is 20 g/70 g/2 g.
  3. 3. The antimony removal process for antimony gold concentrate flotation according to claim 1, wherein the arsenic directional collector is prepared by the following method: A1, adding diethyl phosphonite and absolute ethyl alcohol into a reaction kettle, stirring, introducing nitrogen for protection after uniformly mixing, adding acrylonitrile, heating the reaction kettle to 45-50 ℃, keeping the temperature, stirring for 3-4 hours, and performing post treatment to obtain diethyl (2-cyanoethyl) phosphonate; a2, adding hydroxylamine hydrochloride and deionized water into a reaction kettle, stirring until the hydroxylamine hydrochloride and the deionized water are dissolved, regulating the pH=6.5-7.5 of a reaction system by using a 30-35wt% sodium hydroxide aqueous solution, maintaining the temperature of the reaction kettle to be 20-30 ℃, adding diethyl (2-cyanoethyl) phosphonate dispersion liquid, preserving heat for 1-2h, then heating the reaction kettle to 45-50 ℃, preserving heat, stirring for 4-6h, and performing post-treatment to obtain the arsenic directional collector.
  4. 4. The antimony removal process for antimony from antimony gold concentrate flotation according to claim 3, wherein in the step A1, the dosage ratio of diethyl phosphonite, absolute ethyl alcohol and acrylonitrile is 25-30mL:200mL:30mL, and in the step A2, the dosage ratio of hydroxylamine hydrochloride, deionized water and diethyl (2-cyanoethyl) phosphonate dispersion is 12-16g:200mL:100mL, and the diethyl (2-cyanoethyl) phosphonate dispersion is obtained by mixing diethyl (2-cyanoethyl) phosphonate, absolute ethyl alcohol and deionized water according to the dosage ratio of 20-25mL:80mL:20 mL.
  5. 5. The process for flotation and de-antimony of antimony gold concentrate according to claim 1, wherein the antimony selective collector is prepared by the following method: B1, adding a polybasic reductive amine compound, absolute ethyl alcohol and deionized water into a reaction kettle, stirring until the polybasic reductive amine compound, absolute ethyl alcohol and deionized water are dissolved, cooling the reaction kettle to 0-10 ℃ under the ice bath condition, then adding calculated amount of carbon disulfide, maintaining the pH=10-11 of a reaction system by using 30-35wt% of sodium hydroxide aqueous solution, carrying out heat preservation and stirring for 3-4 hours, heating the reaction kettle to 20-25 ℃, carrying out heat preservation and stirring for 0.5-1 hour, and carrying out post treatment to obtain polybasic dithiocarbamic acid sodium salt; and B2, adding the multi-element dithiocarbamic acid sodium salt, deionized water and absolute ethyl alcohol into a reaction kettle, stirring until the multi-element dithiocarbamic acid sodium salt, the deionized water and the absolute ethyl alcohol are dissolved, continuously adding absolute dichloromethane, introducing nitrogen for protection, cooling the reaction kettle to 0-5 ℃ and adding phosphorus oxychloride, stirring for 1-2 hours after the dripping is finished, heating the reaction kettle to 25-30 ℃, preserving heat, stirring for 3-4 hours, and performing post treatment to obtain the antimony selective collector.
  6. 6. The antimony removal process for antimony from antimony gold concentrate flotation according to claim 5, wherein in the step B1, the dosage ratio of the polybasic reductive amination compound, the anhydrous ethanol and the deionized water is 18-20g to 100mL, wherein the addition amount of carbon disulfide is 0.80-0.85 times of the amino molar amount in a reaction system, and in the step B2, the dosage ratio of the polybasic dithiocarbamic acid sodium salt, the deionized water, the anhydrous ethanol, the anhydrous dichloromethane and the phosphorus oxychloride is 15-20g to 50mL to 30mL to 120mL to 10-15mL.
  7. 7. The process for removing antimony from antimony gold concentrate by flotation according to claim 5, wherein the preparation method of the polybasic reductive amination comprises the steps of adding dodecanal, diethylenetriamine and absolute ethyl alcohol into a reaction kettle, stirring until the materials are mixed uniformly, placing the reaction kettle in an ice bath at 0-5 ℃ for heat preservation and stirring for 0.5-1.5 hours, adding sodium borohydride in five batches under a continuous stirring state, continuously stirring for 1-2 hours at 0-5 ℃, then heating the reaction kettle to 25-30 ℃, stirring for 2-4 hours under heat preservation and post-treatment to obtain the polybasic reductive amination.
  8. 8. The process for removing antimony from antimony gold concentrate by flotation according to claim 7, wherein the amount of dodecanal, diethylenetriamine, absolute ethanol and sodium borohydride used in the preparation of the polybasic reductive amination compound is 20-24mL:20mL:100mL:2.4-3.0g.
  9. 9. The process for removing antimony from antimony gold concentrate by flotation according to claim 1, wherein the preparation method of the lead chelating dispersant comprises the steps of adding deionized water into a reaction kettle, introducing nitrogen for 20-30min under a stirring state, sequentially adding acrylic acid, 2-hydroxyethyl acrylate and 2-mercaptoethanol, stirring and mixing uniformly, heating the reaction kettle to 60-70 ℃, adding 2-4wt% ammonium persulfate aqueous solution, keeping the temperature and stirring for 3-4h, and performing post treatment to obtain the lead chelating dispersant.
  10. 10. The process for removing antimony from antimony gold concentrate by flotation according to claim 9, wherein the dosage ratio of deionized water, acrylic acid, 2-hydroxyethyl acrylate, 2-mercaptoethanol and 2-4wt% ammonium persulfate aqueous solution in the preparation of the lead chelating dispersant is 400mL:30mL:20-30mL:8mL:20-30mL.

Description

Flotation antimony removal process for antimony gold concentrate Technical Field The invention relates to the technical field of ore floatation, in particular to a floatation antimony removal process for antimony gold concentrate. Background The existing flotation treatment technology of the antimony-containing gold concentrate mainly surrounds gold enrichment and selective removal and development of antimony. In gold enrichment, as the proportion of fine gold and coated gold increases, the traditional collecting system is easily affected by interface coating and ore pulp chemical environment under polysulfide coexistence condition, so that the floatability of gold is reduced, and in order to improve the interface exposure degree and adsorption selectivity of gold, the methods of multi-collector compatibility, interface activation, multi-stage enrichment and the like are researched and developed gradually to improve the flotation response of gold, and in the aspect of antimonic removal, as the interface properties of antimonic minerals and gold are similar and co-floatation is easy to occur, the related technology mainly starts with regulating and controlling the pH value of ore pulp, ion composition, medicament structure and process segmentation, so that the adsorption and bubble attachment behaviors of antimonic and bubble attachment are different from those of gold, and thus, a controllable antimonic window is constructed, and in the whole, jin Fuji and antimonic removal technology are developing towards the interface regulation refinement and process cooperative assimilation directions. In the existing flotation treatment of gold concentrate containing arsenic, antimony and lead, because of the defect of an interface regulation means, the arsenic-containing mineral often covers gold particles at an early stage, so that the interface exposure degree of gold is limited, then antimony phases are strongly competitively adsorbed in ore pulp, so that the surrounding liquid phase environment of the gold is unstable, the interface responsiveness is reduced, fine impurities are easily secondarily adsorbed at a subsequent stage, so that the cleanliness of the gold surface is insufficient, the whole floatability is difficult to continuously enhance in a process, and the further improvement of the gold grade is limited. Meanwhile, the prior art is difficult to realize staged and high-selectivity interface distinction of arsenic, antimony and lead, the separation degree of arsenic-containing minerals is not obvious under the near neutral condition, the arsenic-containing minerals are easy to be sticky back in the process, the interface properties of the antimony and gold are similar, the separation window is narrow, the floatability of lead minerals is easy to fluctuate along with the change of the chemical environment of ore pulp and is influenced by shielding of other fine particles, and a stable impurity removal level is difficult to form. The various impurities may re-agglomerate or co-float at a later stage of the process, limiting the availability of high purity gold concentrate. In view of the technical drawbacks of this aspect, a solution is now proposed. Disclosure of Invention The invention aims to provide a flotation and antimony removal process for antimony gold concentrate, which is used for solving the technical problems that the gold enrichment performance and the antimony removal performance of the flotation of the antimony gold concentrate in the prior art are to be further improved. The aim of the invention can be achieved by the following technical scheme: A flotation antimony removal process for antimony gold concentrate comprises the following steps: S1, adding gold concentrate and deionized water into ore grinding equipment, wet grinding until the particle size fraction of 74 μm is 70-80wt%, and adjusting the pH value of ore pulp to be purified to be 6.5-7.0 after grinding to obtain ore pulp; S2, adding ore pulp to be purified into a flotation tank, adding an arsenic directional collector, stirring for 3-5min, adding methyl isobutyl carbinol, floating for 6-8min, and collecting foam as arsenic concentrate to obtain arsenic-removed ore pulp; S3, adding the dearsenified ore pulp into a stirring tank, adjusting the pH value to be 7.0-7.5, adding an antimony selective collector, stirring for 3-5min, adding methyl isobutyl carbinol, floating for 8-10min, and collecting foam to obtain dearsenified and deammonified ore pulp; s4, adding the arsenic-removed and antimony-removed ore pulp into a stirring tank, adjusting the pH value to be 8.0-8.5, adding a lead chelating dispersant, stirring for 5-8min, adding methyl isobutyl carbinol, floating for 4-6min, collecting foam to obtain lead concentrate, and carrying out post-treatment to obtain purified gold concentrate. The reaction principle for preparing the purified gold concentrate is as follows: The method comprises the steps of grinding the surface of