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CN-121988457-A - Silver ore floatation process

CN121988457ACN 121988457 ACN121988457 ACN 121988457ACN-121988457-A

Abstract

The invention provides a silver ore flotation process, which belongs to the technical field of ore dressing and comprises 1) ore grinding and grading, wherein the ore to be treated is subjected to two-section continuous ore grinding and grading to obtain qualified materials with fineness of-0.074 mm accounting for 70-80%, 2) primary flotation, namely primary open-circuit roughing is carried out on the qualified materials to obtain primary roughing concentrate and primary roughing tailings, 3) secondary flotation, namely secondary roughing, secondary scavenging and primary concentration are carried out on the primary roughing tailings to obtain concentrate and flotation tailings, and 4) concentrate synthesis, namely the concentrate is mixed with the concentrate to obtain silver concentrate. The process obtains silver concentrate through a mode of combining rapid flotation and common flotation, and timely removes higher-grade concentrate from a flotation system, so that the whole flotation process flow is simple, the flotation grade and concentration are stable, the operation and control are easy, the control and the production cost reduction are convenient, the beneficiation recovery rate is more than 85%, and the beneficiation technical index is improved.

Inventors

  • Chai Jindong
  • LIAO QINGCHAO
  • LI HAILONG
  • SHAN XIAOLIN
  • MENG GUOFANG

Assignees

  • 内蒙古铸合矿业有限公司

Dates

Publication Date
20260508
Application Date
20260323

Claims (10)

  1. 1.A silver ore floatation process, comprising: 1) Grinding and grading, namely carrying out two-section continuous grinding and grading on the ore to be treated to obtain qualified materials with fineness of-0.074 mm accounting for 70-80%; 2) Performing primary flotation, namely performing primary open-circuit roughing on the qualified materials to obtain primary roughing concentrate and primary roughing tailings; 3) Performing secondary roughing, secondary scavenging and primary concentration on the primary roughing tailings to obtain concentrate and flotation tailings; 4) And (3) concentrate synthesis, namely mixing the concentrated concentrate with the primary roughing concentrate to obtain silver concentrate.
  2. 2. The silver ore floatation process according to claim 1, wherein in the two-stage continuous ore grinding classification, one stage of ore grinding is used for obtaining slurry with the fineness of-3 mm, then the slurry is screened by a linear vibrating screen to obtain materials with the fineness of-3 mm and +3mm, and the materials with the fineness of-3 mm are sent to a first hydrocyclone for classification, so that fine-grained materials with the fineness of-0.074 mm accounting for 50-55% are obtained.
  3. 3. The silver ore floatation process according to claim 1, wherein the particle size of the ore to be treated is 0-12mm.
  4. 4. The silver ore flotation process according to claim 1, wherein the primary open circuit rougher is characterized in that qualified materials are sent into a flotation machine for rapid flotation to obtain primary rougher concentrate and primary rougher tailings, and the flotation concentration of the qualified materials is 40-45%.
  5. 5. The silver ore flotation process according to claim 1, wherein in the second flotation, secondary roughing is performed on the primary roughing tailings to obtain secondary roughing concentrate and secondary roughing tailings, primary scavenging is performed on the secondary roughing tailings to obtain primary scavenging concentrate and primary scavenging tailings, the primary scavenging concentrate is returned to the secondary roughing step, secondary scavenging is performed on the primary scavenging tailings to obtain secondary scavenging concentrate and flotation tailings, the secondary scavenging concentrate is returned to the primary scavenging step, primary concentration is performed on the secondary roughing concentrate to obtain concentration concentrate and concentration tailings, and the concentration tailings are returned to the primary open-circuit roughing step.
  6. 6. The silver ore floatation process according to any one of claims 1 to 5, wherein the collectors used in the first floatation and the second floatation comprise a xanthate collector selected from at least one of amyl xanthate, isopropyl xanthate, butyl xanthate and isobutyl xanthate, and a black agent collector selected from at least one of butylammonium black and No. 25 black, an activator selected from at least one of copper sulfate, ammonium sulfate, copper sulfate and ammonium sulfate, and a foaming agent selected from at least one of polyethylene glycol, no. 2 oil and methyl isobutyl carbinol.
  7. 7. The silver ore flotation process according to claim 6, wherein the one-time open-circuit coarse selection is characterized in that the collecting agent is a composition of 25-40g/t butyl xanthate and 15-20g/t butylammonium black drug, and the foaming agent is 10-15g/t 2# oil.
  8. 8. The silver ore flotation process according to claim 6, wherein the secondary coarse separation, the collecting agent adopts a composition of 25-40g/t amyl xanthate and 15-20g/t butylammonium black drug, the foaming agent is 10-15g/t 2# oil, and the activating agent is 90-100g/t copper sulfate.
  9. 9. The silver ore floatation process according to claim 6, wherein in the one-time sweeping, the collecting agent is a composition of 15-20g/t amyl xanthate and 10-15g/t butylammonium black drug, and the foaming agent is 2# oil of 5-10 g/t.
  10. 10. The silver ore floatation process according to claim 6, wherein in the secondary sweeping, the collecting agent is a composition of 15-20g/t amyl xanthate and 10-15g/t butylammonium black drug, and the foaming agent is 2# oil of 5-10 g/t.

Description

Silver ore floatation process Technical Field The invention relates to the technical field of mineral separation, in particular to a silver ore floatation process. Background Silver is relatively low in the crust of the earth, but its unique physical and chemical properties make it widely used in many fields. China is one of countries with rich nonferrous metal resources in the world, but silver ore resources are relatively deficient, large ore is less, and lean ore is more. Along with continuous exploitation and utilization of mineral resources, the mineral resources are easy to select and the mineral resources are increasingly reduced, so that development and utilization of silver ore resources associated with nonferrous metals are gradually paid attention to. The main minerals of silver include silvery ore (Ag 2 S), sulfur copper silver ore (AgCuS), sulfur antimony silver ore (Ag 3SbS3), sulfur arsenite (Ag 3AsS3), horned silver ore (AgCl), chlorine bromine silver ore (agcl·agbr), tellurium gold silver ore, and the like. Other metal minerals are mainly pyrite, sphalerite and galena, and a small amount of chalcopyrite, chalcocite, arsenopyrite and the like. The metal oxide mainly comprises magnetite, hematite, siderite, chromite, pyrolusite and the like, the content of the metal oxide is not high, and the content of the magnetite and the hematite is only 0.89 percent. The gangue minerals mainly comprise quartz, feldspar, plagioclase, small amount of scale mica minerals (mainly muscovite and sericite), etc. The exploitation and processing process of silver ore involves a plurality of links including exploitation, crushing, grinding, beneficiation, smelting and the like of the ore. In the ore dressing process of silver ore, flotation is an important sorting link, and the flotation operation is performed to obtain finer granularity of the selected minerals, so that all the minerals are required to be subjected to ore grinding operation to reach the required granularity range. However, in the raw ore, the granularity of the silver-containing mineral embedded cloth is not uniform, and part of the granularity of the silver-containing mineral embedded cloth is extremely fine, has close relation with gangue and is not easy to dissociate, and during ore dressing, the part of silver mineral is easy to lose, so that a great amount of valuable metal is wasted, and the ore dressing cost is easy to increase. At present, the flotation process adopted by the applicant is stage flotation, as shown in figure 1, specifically, a primary flotation process of primary roughing and primary scavenging is adopted after primary grinding and classification, and then a secondary flotation process of primary roughing and secondary scavenging is adopted after secondary grinding and classification. The flotation process has the following problems that the two-stage ore grinding concentration is difficult to control in the production process, the control cost and the production cost of the two-stage ore grinding are increased, the two-stage flotation concentration is difficult to control due to the fact that the two-stage ore grinding concentration is difficult to control, and the process flow is complex and difficult to operate and manage on site. Therefore, development of a new silver ore flotation process which is easy to control, low in cost, stable in flotation grade and concentration becomes a necessary trend. Disclosure of Invention The invention provides a silver ore floatation process which is easy to control, low in cost, stable in floatation grade and concentration, and aims to solve the technical problems. In order to achieve the above object, the present invention provides a silver ore floatation process comprising: 1) Grinding and grading, namely carrying out two-section continuous grinding and grading on the ore to be treated to obtain qualified materials with fineness of-0.074 mm accounting for 70-80%; 2) Performing primary flotation, namely performing primary open-circuit roughing on the qualified materials to obtain primary roughing concentrate and primary roughing tailings; 3) Performing secondary roughing, secondary scavenging and primary concentration on the primary roughing tailings to obtain concentrate and flotation tailings; 4) And (3) concentrate synthesis, namely mixing the concentrate with the primary rougher concentrate to obtain silver concentrate. The process adopts the technological processes of two sections of continuous grinding classification, primary open roughing and secondary roughing, secondary scavenging, primary concentration and sequential return of the scavenged ore, silver concentrate is obtained by combining rapid flotation and common flotation, and the higher-grade concentrate is timely moved out of a flotation system, so that the whole flotation technological process is simple, the flotation grade and concentration are stable, the operation and control are easy, the control and the reduction