A kind of flotation recovery method of high-calcium-magnesium-high-shale mixed lead-zinc ore

Abstract

The invention provides a method for flotation recovery of high-calcium-magnesium-high-mud mixed lead-zinc ore. A small amount of lime is added to the raw ore for wet grinding to obtain ore pulp; then lead sulfide flotation, zinc sulfide flotation, and desulfurization are sequentially carried out Flotation and zinc oxide flotation, realize the flotation recovery of mixed lead-zinc ore. Through the above method, the present invention adopts lead-zinc sulfide low-alkali flotation and zinc oxide collector without desliming full-grain flotation technology, realizes the efficient flotation recovery of mixed lead-zinc ore, and greatly improves the lead-zinc The recovery rate further improves the utilization rate of resources; at the same time, the present invention can effectively solve the problems existing in the existing high-alkali process and the flotation process after zinc oxide desliming, making the overall flotation process green, stable and efficient, with good The technical and economic indicators can meet the needs of practical applications and have high application value.

Description

technical field [0001] The invention relates to the technical field of lead-zinc ore flotation, in particular to a flotation recovery method for high-calcium-magnesium and high-shale mixed lead-zinc ore. Background technique [0002] The mixed lead-zinc ore with high calcium and magnesium content generally has the following characteristics: 1) There are many kinds of calcium-magnesium gangue minerals, including not only calcium-magnesium carbonates such as dolomite and calcite, but also quartz, feldspar, amphibole, pyroxene, etc. Stone, chlorite, mica and other magnesium silicates; 2) The mineral content of calcium magnesium gangue is high, up to 50% to 70%; 3) The sludge is serious, and the ore contains a lot of slime. Among them, there are two reasons for the formation of ore slime. One is primary ore slime, mainly the argillaceous gangue minerals in the ore, such as chlorite, kaolinite, sericite, limonite and hematite, etc. The content of slime less than 10μm is as high ...

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Problems solved by technology

[0004] However, the above-mentioned existing high-calcium-magnesium-high-mud mixed lead-zinc ore beneficiation technology has the following problems: 1) a large amount of lime is added to the flotation of lead sulfide, and the whole flotation process is carried out in a high alkalinity environment with pH=11. Zinc oxide flotation requires an environment with a pH of about 9 to 10, so 1 to 2 kg / t of ammonium bicarbonate needs to be added to adjust the pH value before zinc oxide flotation, resulting in high ammonia content in the dressing plant and harsh working environment; 2 ) Due to the addition of a large amount of lime, zinc sulfide is inhibited, and a large amount of copper sulfate is required for activation in the zinc sulfide flotation operation. The amount of copper sulfate is as high as 800-1000g / t, and the reagent cost is high; 3) On-site process of zinc oxide flotation The technical process of flotation after desliming is adopted, resulting in the removal of nearly 50% of the zinc metal content, resulting in a low recovery rate of zinc oxide; 4) zinc oxide generally uses fatty acid or amine collectors, which are collected The amount of agent foam is large, resulting in rich flotation foam and high viscosity, difficult defoaming, and unstable flotation process; 5) The pH value of the mineral processing backwater is as high as 11, making it difficult to reuse

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