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CN-122006904-A - Floatation separation method for galena and pyrite

CN122006904ACN 122006904 ACN122006904 ACN 122006904ACN-122006904-A

Abstract

The invention belongs to the technical field of ore dressing, and particularly relates to a flotation separation method of galena and pyrite. The method comprises the steps of crushing galena and pyrite, mixing, pulping, adjusting the pH value to 6.5-7.5 to obtain ore pulp, adding complexing agent into the ore pulp, pulping, adding a combined collector, pulping, adding a foaming agent, pulping, carrying out flotation after pulping, respectively obtaining concentrate and tailings, wherein the complexing agent is selected from EDTA-2Na, and the combined collector is composed of 3418A and structural formula Wherein R is selected from vinyl, allyl or ethyl. Through the synergistic effect of the complexing agent and the combined collector, the method is suitable for the flotation separation of lead-iron sulphide minerals under the neutral pH condition, so that the high-efficiency separation of galena and pyrite is realized, and the galena and pyrite flotation composite agent under the neutral pH condition is environment-friendly.

Inventors

  • YAN HUASHAN
  • WU TAO
  • QIU TINGSHENG
  • QIU XIANHUI
  • ZHAO GUANFEI
  • ZHOU XIAOWEN

Assignees

  • 江西理工大学

Dates

Publication Date
20260512
Application Date
20260402

Claims (9)

  1. 1. The floatation separation method of galena and pyrite is characterized by comprising the following steps: crushing, mixing and pulping galena and pyrite, and then adjusting the pH value to 6.5-7.5 to obtain ore pulp; Adding complexing agent into ore pulp, mixing pulp, adding combined collecting agent, mixing pulp, adding foaming agent, mixing pulp, and floating to obtain concentrate and tailings; Wherein the mass ratio of the complexing agent, the combined collector and the foaming agent is 60-180:10:5; The complexing agent is selected from EDTA-2Na; The combined collector consists of 3418A and the structural formula: wherein R is selected from vinyl, allyl or ethyl, and the mass ratio of 3418A to the thiourea compound is 1:1-3.
  2. 2. The method for flotation separation of galena from pyrite according to claim 1, wherein the mass ratio of complexing agent, combined collector and frother is 140:10:5.
  3. 3. The method for the flotation separation of galena from pyrite according to claim 1, characterized in that the frothing agent is chosen from methyl isobutyl carbinol.
  4. 4. The method for the flotation separation of galena and pyrite according to claim 1, wherein the particle size of the galena and pyrite in the ore pulp is 0.074mm + -0.038 mm.
  5. 5. The flotation separation method of galena and pyrite according to claim 1, wherein the volume ratio of the sum of complexing agent, combined collector and foaming agent to ore pulp is 35 mg-195 mg/L.
  6. 6. The flotation separation method of galena and pyrite according to claim 1, wherein the complexing agent is added and then slurried for 1 min-3 min.
  7. 7. The flotation separation method of galena and pyrite according to claim 1, wherein the combined collector is added and then mixed for 1 min-3 min.
  8. 8. The flotation separation method for galena and pyrite according to claim 1, wherein the slurry is mixed for 1min after the foaming agent is added.
  9. 9. The flotation separation method of galena and pyrite according to claim 1, wherein the flotation time is 3-6 min.

Description

Floatation separation method for galena and pyrite Technical Field The invention belongs to the technical field of ore dressing, and particularly relates to a flotation separation method of galena and pyrite. Background Galena is used as the lead mineral with the most wide distribution in the nature, is the main mineral raw material for extracting metallic lead in the industry at present, and the global lead yield of about 85 percent is derived from the dressing and smelting process of the galena. Meanwhile, pyrite, which is the sulfide mineral with the highest content in the crust, plays an important role in sulfuric acid industrial production, and contributes more than 60% of global sulfuric acid raw materials. In the aspect of geological features of ore deposits, galena and pyrite often show a close symbiotic relationship, and due to the high similarity of the galena and pyrite in the aspects of crystal structure, surface physical and chemical properties and the like, the conventional flotation separation process is difficult to realize effective separation. The most common and effective method for separating lead-iron sulphide minerals at the current stage is performed by a flotation method, and research of the flotation method is mainly focused on development of flotation agents, and particularly, the minerals are selectively collected by utilizing the synergistic effect of combined collectors and developing novel collectors. The traditional yellow drug collecting agent has stronger adsorption capacity on galena and pyrite, which causes that the floatability of the galena and pyrite is similar, and the effective separation is difficult, and at present, different types of inhibitors are often added to inhibit the floatation of pyrite in industry, so that the floatation separation of galena and pyrite is realized, the common lime high-alkali inhibition method can inhibit pyrite, but can reduce the recovery rate of galena, and the high-pH environment is easy to cause sliming to influence the floatation effect, and the inhibition effect of environment-friendly inhibitors (such as organic adhesives and polysaccharides) is unstable. In conclusion, because the surface hydrophobicity of galena is similar to that of pyrite, the conventional medicament is difficult to differentially adsorb, in addition, pyrite is easy to oxidize, a hydrophilic film of Fe (OH) 3 is formed, the oxidation degree is difficult to accurately control, and excessive oxidation can affect the floatation of galena. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a floatation separation method of galena and pyrite, which comprises the steps of crushing, mixing and pulping the galena and pyrite, then adjusting the pH value to 6.5-7.5 to obtain ore pulp, adding complexing agent into the ore pulp, pulping, adding combined collector, pulping, adding foaming agent, pulping, carrying out floatation after pulping, respectively obtaining concentrate and tailings, wherein the complexing agent is selected from EDTA-2Na, and the combined collector is composed of 3418A and structural formulaWherein R is selected from vinyl, allyl or ethyl, and is suitable for the floatation separation of lead-iron sulphide minerals under the neutral pH condition through the synergistic effect of a complexing agent and a combined collector, so that the high-efficiency separation of galena and pyrite is realized, and the floatation is environment-friendly under the neutral pH condition. Based on the technical purpose, the invention adopts the following technical scheme: The invention discloses a flotation separation method of galena and pyrite, which is characterized by comprising the following steps: Crushing galena and pyrite, mixing, regulating the slurry, then regulating the pH to 6.5-7.5, and regulating the pH by adopting a hydrochloric acid solution or a sodium hydroxide solution to obtain ore pulp; when the existing technology is used for lead-iron separation, a great amount of lime is used for inhibiting gangue minerals, so that the pH value is increased, the ore pulp and the environment are damaged, and the method is characterized in that the flotation separation is carried out under the condition of neutral pH value and in a lime-free method. Adding complexing agent into ore pulp, mixing, adding combined collector, mixing, adding foaming agent, mixing, floating to float galena, and separating galena from pyrite to obtain concentrate and tailings. The mass ratio of the complexing agent, the combined collector and the foaming agent is 60-180:10:5. The complexing agent is selected from EDTA-2Na. The combined collector consists of 3418A and the structural formula: wherein R is selected from vinyl, allyl or ethyl, and the mass ratio of 3418A to the thiourea compound is 1:1-3. Further, the mass ratio of the complexing agent, the combined collector and the foaming agent is 140:10:5, and the ratio can realize that the recovery rat