A low-alkali and sulfuric acid-free flotation process for high-sulfur lead-zinc ore

A technology of lead-zinc ore and high-sulfur lead, which is applied in the field of flotation separation of galena and pyrite, sulfide lead-zinc ore, and flotation separation of sphalerite, which can solve the problems affecting the concentrate grade and recovery rate, Poisonous, safety and management issues, etc., to reduce the difficulty of production management, avoid environmental pollution, and reduce processing costs

Active Publication Date: 2020-05-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] High alkali preferential flotation is very mature, with perfect theory and stable indicators, but in the high alkalinity slurry environment, precious metal elements such as gold and silver will be inhibited to varying degrees, which is not conducive to the comprehensive recovery of valuable metals
In addition, it is difficult to make lime pulp, and it is easy to block the pipeline, and the flotation foam in the high-alkalinity slurry will become sticky, which will affect the grade and recovery rate of the concentrate
[0004] The priority flotation process determines that pyrite is the last mineral to be floated. However, pyrite was suppressed by lime in the previous process, so the pH value of the pulp can only be adjusted by adding a large amount of sulfuric acid.
Sulfuric acid is a dangerous chemical, toxic and highly corrosive, and can volatilize to produce dangerous gases such as hydrogen sulfide and sulfur dioxide, which will bring safety and management problems during storage, transportation and use. high cost

Method used

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  • A low-alkali and sulfuric acid-free flotation process for high-sulfur lead-zinc ore
  • A low-alkali and sulfuric acid-free flotation process for high-sulfur lead-zinc ore
  • A low-alkali and sulfuric acid-free flotation process for high-sulfur lead-zinc ore

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Experimental program
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Effect test

Embodiment 1

[0058] 1. Mineral raw materials:

[0059] Take the raw ore of a lead-zinc mine in Yunnan Province, the grade of lead is 5.6%, the grade of zinc is 12%, and the grade of sulfur is 28.5%.

[0060] Second, the steps of the flotation process are as follows, such as figure 2 Shown:

[0061] (1) Grind the ore until the monomer dissociates to -200 mesh, accounting for 80%, add sodium carbonate and zinc sulfate in turn to the raw ore pulp as a pulp regulator and sphalerite inhibitor, add butyl xanthate, ethyl disulfide As a collector for galena and pyrite, the foaming agent is No. 2 oil, and the pH of the slurry is adjusted to 8.5 to realize mixed flotation of lead and sulfur: After 2 times of roughing, 2 times of beneficiation, and 1 time of sweeping, lead is obtained Sulfur floating concentrate and lead sulfur floating tailings;

[0062] Among them, the total amount of chemicals added in the roughing operation: sodium carbonate 800-1500g / t, zinc sulfate 800-1500g / t, galena and p...

Embodiment 2

[0086] 1. Mineral raw materials:

[0087] Take the raw ore of a lead-zinc mine in Hunan Province, the grade of lead is 2.96%, the grade of zinc is 6.16%, and the grade of sulfur is 15.65%.

[0088] Second, the steps of the flotation process are as follows, such as Figure 4 Shown:

[0089] (1) Grind the ore until the monomer is dissociated to a fineness of -200 mesh, accounting for 82%. Add sodium sulfite and zinc sulfate in turn to the raw ore pulp as a slurry regulator and sphalerite inhibitor. Sulfur and nitrogen are used as collectors for galena and pyrite, No. 2 oil is used as the foaming agent, and the pH of the pulp is adjusted to 8.0 to realize mixed flotation of lead and sulfur. Obtain lead-sulfur mixed floating concentrate and lead-sulfur mixed floating tailings;

[0090] Among them, in the process of lead-sulfur mixed flotation, the middle ore of one selection and one sweeping is re-ground, and sphalerite inhibitor and lead and sulfur collectors are added after r...

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Abstract

The invention discloses a low alkali sulfur acid free floatation technology for high sulfur lead zinc ores, and belongs to the technical field of ore processing. Sulfur concentrate (pyrite) is obtained after lead-sulfur mixing-floating and lead-sulfur separation. Sulfur acid is not used, the environmental pollution caused by sulfuric acid is avoided, the wastewater processing cost is reduced; at the same time, the steps for storing, transporting, and using sulfuric acid are all eliminated, the production and management difficulty is reduced; in lead-sulfur separation, lime, BP, and BH are usedas an inhibitor for pyrite, the novel medicaments (BP, BH) have a good separation effect; the alkalinity of the mineral slurry is low, the using amount of lime is reduced; and solved are problems that the alkalinity of mineral slurry is high, the foams are viscous, the entrainment of gangue is severe, and the comprehensive recovery rate of precious metals such as silver, gold, and the like, is low.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and relates to a flotation separation method of lead-zinc sulfide ore, in particular to the realization of galena, pyrite and sphalerite under low-alkali conditions without using sulfuric acid. flotation separation method. Background technique [0002] The traditional flotation separation principle process of lead-zinc sulfide ore is as follows: 1) Priority flotation: By adding a large amount of lime and zinc sulfate, a high-alkaline slurry environment is formed to inhibit the flotation of pyrite and sphalerite, and realize galena Separation of ore, pyrite and sphalerite; adding a large amount of lime to the tailings of lead selection to form a high-alkali slurry environment to suppress pyrite and realize the separation of pyrite and sphalerite; adjusting the tailings of zinc selection by adding a large amount of sulfuric acid 2) Lead-zinc mixed flotation: suppress pyrite by adding a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/018B03B7/00B03B9/00B03D101/02B03D101/04B03D101/06B03D103/02
Inventor 孙伟刘润清王长涛倪章元胡岳华宋鑫张庆鹏
Owner CENT SOUTH UNIV
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