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CN-121610637-B - Low-grade encapsulation Jin Chong medium enrichment, roasting and leaching process

CN121610637BCN 121610637 BCN121610637 BCN 121610637BCN-121610637-B

Abstract

The application provides a low-grade packaging Jin Chong medium enrichment, roasting and leaching process, and belongs to the field of mineral resource processing. The process comprises the steps of S1, carrying out suspension roasting on fine particle coated gold concentrate in a continuous suspension roasting system at a roasting temperature of 480-520 ℃ and an oxygen concentration of 8-12% to obtain roasted concentrate, S2, carrying out two-stage ball milling on the roasted concentrate to obtain ball-milling ore pulp, and S3, carrying out leaching treatment on the ball-milling ore pulp by adopting a composite gold leaching agent at a ball-milling ore pulp concentration of 40-50%, a temperature of 20-30 ℃ and a pH value of 10.5-11.5 to obtain leached ore pulp. By constructing a full-flow collaborative system of roasting pretreatment, grinding connection and leaching adaptation, the process barriers of roasting and leaching are broken, a continuous optimal recovery environment is created for each type of micro-particle coated gold, and the leaching rate, stability and economy of the coated gold are synchronously improved.

Inventors

  • LI ZHIFENG
  • ZHANG JIAQI
  • GAO YE
  • HU ZHIGANG
  • ZHOU NAN
  • YANG TIANSHU
  • Teng Shouren
  • ZHANG SHITAO
  • CHENG XIUFENG
  • SHAO KUN

Assignees

  • 辽宁省地质矿产研究院有限责任公司

Dates

Publication Date
20260512
Application Date
20260203

Claims (9)

  1. 1. The low-grade encapsulation Jin Chong medium enrichment, roasting and leaching process is characterized by comprising the following steps of: S1, carrying out suspension roasting on fine particle coated gold concentrate in a continuous suspension roasting system at a roasting temperature of 480-520 ℃ and an oxygen concentration of 8-12%, so as to obtain roasted concentrate; s2, performing two-stage ball milling on the roasted concentrate to obtain ball milling ore pulp; s3, under the conditions that the concentration of the ball-milling ore pulp is 40-50%, the temperature is 20-30 ℃ and the pH value is 10.5-11.5, adopting a composite gold leaching agent to leach the ball-milling ore pulp to obtain leached ore pulp; the composite gold leaching agent comprises, by mass, 45-65 parts of ammonium thiosulfate, 8-15 parts of urea, 1-4 parts of copper sulfate, 0.05-0.5 part of sodium dodecyl sulfate and 5-15 parts of citric acid; the dosage of the composite gold leaching agent is 55-65 kg/t dry ore; the temperature of the leaching treatment is 20-30 ℃ and the time is 20-28 h.
  2. 2. The low-grade coated Jin Chong media enrichment, roasting and leaching process according to claim 1, wherein the grade of the fine particle coated gold concentrate is 0.96-1.0 g/t.
  3. 3. The low-grade coated Jin Chong medium enrichment, roasting and leaching process according to claim 2, wherein the fine-grain coated gold concentrate is a mixture of heavy medium pre-enriched concentrate and heavy medium separation tailings from the same raw ore, wherein the grade of the heavy medium pre-enriched concentrate is 1.04-1.08 g/t, and the heavy medium separation tailings are low-density products obtained after the heavy medium separation process.
  4. 4. The low grade package Jin Chong media enrichment, roasting and leaching process of claim 1, wherein the continuous suspension roasting system comprises a feed bin, a weightless scale, a suspension roasting furnace, a cyclone separator, a vertical cylinder cooler and a dust collection system, and the roasting atmosphere is maintained by controlling loose air and fluidization air that are introduced into the suspension roasting furnace.
  5. 5. The low-grade packaging Jin Chong medium enrichment, roasting and leaching process according to claim 4, wherein the nitrogen flow rate of the loosening wind is 2.0-2.2 m 3 /h, the air flow rate is 1.8-2.0 m 3 /h, the nitrogen flow rate of the fluidization wind is 3.6-3.8 m 3 /h, and the air flow rate is 3.2-3.4 m 3 /h.
  6. 6. The low-grade encapsulation Jin Chong medium enrichment, roasting and leaching process according to claim 1, wherein the suspension roasting feeding amount is 18-22 kg/h.
  7. 7. The low-grade package Jin Chong medium enrichment, roasting and leaching process according to claim 1, wherein the grade of the roasted concentrate is 1.11-1.15 g/t, the burning loss rate is less than or equal to 10%, and the decomposition rate of the fine particle package type gold concentrate is more than or equal to 90%.
  8. 8. The low grade encapsulation Jin Chong media enrichment, roasting and leaching process of claim 1, wherein the two-stage ball milling comprises: firstly, carrying out one-stage ball milling on the roasted concentrate until the material with the granularity smaller than 200 meshes accounts for more than or equal to 90 percent; And performing secondary ball milling on the materials subjected to the primary ball milling until the material with the granularity smaller than 400 meshes accounts for more than or equal to 95 percent.
  9. 9. The low grade encapsulation Jin Chong media enrichment, roasting and leaching process of claim 1, further comprising the steps of: s4, carrying out solid-liquid separation on the leached ore pulp to obtain a noble liquid and leached residues; The grade of the noble liquid is 4.0-4.5 g/t, and the grade of the leaching residue is 0.15-0.17 g/t.

Description

Low-grade encapsulation Jin Chong medium enrichment, roasting and leaching process Technical Field The application relates to the technical field of mineral resource processing, in particular to a low-grade packaging Jin Chong medium enrichment, roasting and leaching process. Background The gold ore coated with the micro-particles is an important gold resource in China, but the efficient recovery of the gold ore is always a great technical challenge in the field of dressing and smelting. Currently, the industrial treatment processes for such ores mainly include direct cyanidation leaching, conventional roasting-leaching, bioleaching, and the like. Although the direct cyaniding leaching process is simple in flow, the coated gold is not pretreated, and the contact between the leaching agent and gold is seriously hindered by the inclusion of the micro-particles, so that the leaching rate of gold is only 60-70%, and the resource waste is serious. In the conventional roasting-leaching process, although micro-particle inclusion is decomposed through thermal pretreatment, the roasting temperature is in a high temperature range of 600-700 ℃, ore sintering and secondary gold inclusion are easy to cause, exposure of gold is blocked, leaching rate is limited (75-80%), and the problem of high energy consumption exists. Although the bioleaching process is environment-friendly, the reaction period is as long as 7-10 days, the bioleaching process is extremely sensitive to environmental factors such as temperature, pH value and the like, the process stability is poor, and the requirements of industrial large-scale application on efficiency and stability are difficult to meet. The prior art has systematic defects of regarding 'roasting' and 'leaching' as mutually independent processes, and cannot integrally design and cooperatively optimize key roasting parameters (temperature and atmosphere) and subsequent leaching parameters (grinding fineness and medicament system) aiming at the characteristic of wrapping gold by micro-particles. The dislocation of the process chain causes that the output of the upstream process cannot create optimal conditions for the downstream process, and a series of linkage problems such as low leaching rate, insufficient process stability (the fluctuation range of the leaching rate is more than or equal to 5 percent), high comprehensive cost, poor adaptability to different ores and the like are caused. Therefore, the prior art cannot construct a continuous, stable and efficient optimal recovery environment for the micro-particle coated gold, and the fundamental technical problems are serious disjointing of two key processes of roasting and leaching and isolation of system process parameters, so that synchronous improvement of leaching rate, stability and economy is severely restricted. The application aims to solve the technical bottleneck of the system. Disclosure of Invention The application provides a low-grade package Jin Chong medium enrichment, roasting and leaching process, which aims to solve the technical problems that two key roasting and leaching processes in the prior art are mutually disjointed and cannot create a continuous and optimal recovery environment for all types of fine particle package gold, so that the synchronous improvement of leaching rate, stability and economy is restricted. The application provides a low-grade packaging Jin Chong medium enrichment, roasting and leaching process, which comprises the following steps: S1, carrying out suspension roasting on fine particle coated gold concentrate in a continuous suspension roasting system at a roasting temperature of 480-520 ℃ and an oxygen concentration of 8-12%, so as to obtain roasted concentrate; s2, performing two-stage ball milling on the roasted concentrate to obtain ball milling ore pulp; s3, under the conditions that the concentration of the ball-milling ore pulp is 40-50%, the temperature is 20-30 ℃ and the pH value is 10.5-11.5, adopting a composite gold leaching agent to leach the ball-milling ore pulp to obtain leached ore pulp; the composite gold leaching agent comprises, by mass, 45-65 parts of ammonium thiosulfate, 8-15 parts of urea, 1-4 parts of copper sulfate, 0.05-0.5 part of sodium dodecyl sulfate and 5-15 parts of citric acid. Optionally, the grade of the fine particle coated gold concentrate is 0.96-1.0 g/t. Optionally, the fine particle wrapped gold concentrate is a mixture of a heavy medium pre-enriched concentrate and a heavy medium separation tailing which is from the same raw ore and is ground to be minus 0.5mm, the grade of the heavy medium pre-enriched concentrate is 1.04-1.08 g/t, and the heavy medium separation tailing is a low-density product obtained after the heavy medium separation process treatment. Optionally, the continuous suspension roasting system comprises a feed bin, a weightless scale, a suspension roasting furnace, a cyclone separator, a vertical cylinder cooler and a dust colle