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- Composition min\u00e9rale<\/strong>: Type, content, and distribution of valuable minerals and gangue.<\/li>\n
- Ore genesis<\/strong>: Primary (e.g., sulfide\/oxide minerals) vs. secondary mineralization.<\/li>\n
- Impurities and isomorphic substitution<\/strong>: Presence of soluble salts or trace elements (e.g., iron in sphalerite affecting floatability).<\/li>\n
- Oxydation de surface<\/strong>: Variations during mining, storage, or transportation.<\/li>\n<\/ul>\n
Different deposits of the same mineral may exhibit distinct flotation behaviors due to formation conditions, structural variations, and impurity content.<\/strong> For example, the floatability of galena or sphalerite collected from different producing areas is very different, especially the different colors of sphalerite (related to the amount of impurities such as iron and cadmium) are more prominent. The floatability of apatite, calcite, or barite produced in the production area is also very different. The reason for this phenomenon is mainly related to the conditions for the production of minerals and the entry of impurities into the minerals in the same way. In addition, during the mining, transportation, and storage of ore, the floatability of the mineral may also change due to the oxidation of the mineral surface and the contamination of impurities.<\/p>\n
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![\"flottaison\"](\"https:\/\/www.jxscmachine.com\/wp-content\/uploads\/2021\/12\/floation-1223.jpg\")
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Impact of Mineral Formation on Floatability<\/h2>\n
Les conditions de formation des min\u00e9raux utiles affectent la structure des min\u00e9raux et ont une forte influence sur la flottabilit\u00e9 des min\u00e9raux.<\/b><\/strong> Les min\u00e9raux sulfur\u00e9s g\u00e9n\u00e9r\u00e9s dans des conditions de pression et de temp\u00e9rature \u00e9lev\u00e9es, tels que ceux s\u00e9par\u00e9s du magma en fusion ou pr\u00e9cipit\u00e9s \u00e0 partir de fluides hydrothermaux, ont g\u00e9n\u00e9ralement une structure relativement compacte, sans pores interm\u00e9diaires, et la taille g\u00e9om\u00e9trique des cristaux min\u00e9raux est relativement importante.<\/p>\n
La s\u00e9quence de formation des min\u00e9raux peut avoir un impact important sur la flottation. <\/b><\/strong>When there are cracks in the minerals formed earlier, they are often filled with minerals formed later to become vein-like or net-like structures. In the process of crushing and grinding, new fracture surfaces often appear along the fine mesh veins of the ore, and the secondary minerals are more prone to slumping.<\/p>\n
Pendant le processus de min\u00e9ralisation, enrichissement secondaire<\/b><\/strong> sometimes occurs; that is, after some primary sulfide minerals interact with other metal salt solutions, they precipitate to form a rich ore zone at the contact between the oxide ore and the primary sulfide ore. Due to secondary enrichment, films with different compositions are often formed on the surface of primary sulfide minerals. A typical example is that the surface of pyrite is covered with chalcocite or a copper blue film; it is also common that the surface of chalcopyrite is covered with copper blue, and the surface of sphalerite is covered by a silverite film. Obviously, during crushing and grinding, it is very difficult to completely separate the covering film on the mineral surface from the mineral, resulting in the mineral having floatability similar to that of the covering film.<\/p>\n
Il convient de souligner que les deux changements suivants ont un impact particuli\u00e8rement important sur les propri\u00e9t\u00e9s de flottation des min\u00e9raux. silicification<\/i><\/b><\/em><\/strong>; l'autre est kaolinization, chloriteization, and sericitization<\/i><\/b><\/em><\/strong>. In the first case, the minerals are glued by silica; in the second case, many very different microcrystalline minerals are formed, which will produce a large amount of fine mud during the grinding process.<\/p>\n
Selon les types de min\u00e9raux symbiotiques, le degr\u00e9 de difficult\u00e9 de la s\u00e9paration par flottation est \u00e9galement tr\u00e8s diff\u00e9rent,<\/b><\/strong> parce que dans la s\u00e9paration par flottation, non seulement un ou plusieurs min\u00e9raux sont faciles \u00e0 flotter dans le produit mousseux, mais aussi d'autres min\u00e9raux qui ne devraient pas flotter. Facilit\u00e9 de contr\u00f4le. Par exemple, il n'y a aucune difficult\u00e9 \u00e0 utiliser des collecteurs d'acides gras pour faire flotter la scheelite \u00e0 partir du quartz, mais si la gangue est de la calcite, de la fluorite ou de la dolomite, la s\u00e9paration par flottation est tr\u00e8s compliqu\u00e9e ; les compos\u00e9s sulfur\u00e9s sont utilis\u00e9s \u00e0 partir de min\u00e9raux non sulfur\u00e9s Il est \u00e9galement relativement simple pour les collecteurs de faire remonter \u00e0 la surface les min\u00e9raux sulfur\u00e9s, mais il est beaucoup plus difficile de s\u00e9parer les min\u00e9raux sulfur\u00e9s concentr\u00e9s ou les min\u00e9raux sulfur\u00e9s partiellement oxyd\u00e9s les uns des autres.<\/p>\n
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Ore Blending Strategies for Stable Flotation Performance: From Mining to Processing<\/h2>\n
La nature du minerai est un facteur objectif difficile \u00e0 modifier.<\/b><\/strong>, so corresponding technological measures must be taken in the practice of flotation production to adapt to the nature of the ore and its changing law. In order to establish a relatively stable process operation system and obtain a relatively stable flotation index, the ore entering the concentrator should be relatively stable in nature to facilitate management. This often requires the cooperation of mining and beneficiation workers. Can be achieved. For example, before blasting, some mines first sample and analyze the ore<\/strong> <\/em>in each pit and face each face, to roughly find out the grade and composition of the ore blasted from each face, and then, according to each face, Proper ore blending is performed in proportion to the amount of ore produced. Some mines are equipped with special ore blending sites<\/strong><\/em> to maintain the relatively stable nature of the ore beneficiation process; some concentrators also perform ore blending by feeding and unloading during the crushing process; In other dressing plants, the grinding products are mixed through a public \u00e9paississeur<\/a><\/strong><\/em> to mix the grinding products of the whole field, and remove excess water or fine mud, so that the feed concentration of the flotation operation is also relatively stable.<\/p>\n
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How Do You Select a Flotation Process?<\/h2>\n
Le choix du proc\u00e9d\u00e9 de flottation d\u00e9pend de la taille des particules et des caract\u00e9ristiques des boues des min\u00e9raux utiles contenus dans le minerai. <\/b><\/strong>
\n<\/b>There are five types of inlay granularity:<\/strong> coarse-grained inlay, fine-grained uniform inlay, uneven in thickness, complex uneven inlay, and aggregate inlay.<\/p>\n- \n
- For coarse-grained embedded ore, because the particle size of the embedded cloth is coarse, it is easy to separate useful minerals from the gangue. It is advisable to use the two-stage flotation principle process of regrinding the medium ore;<\/li>\n
- Coarse grains and fine grains. In one stage, part of the coarse-grained qualified concentrate can be obtained, and the fine-grained contiguous body is reground and re-selected. It is advisable to use the two-stage flotation principle process or the three-stage flotation principle process of the tailings regrind;<\/li>\n
- Evenly embedded ore, because the particle size of the embedded ore is extremely uneven, and the dissociation range is very wide, it is appropriate to use the three-stage flotation principle process;<\/li>\n
- In aggregate ore, because the useful minerals are contained in a larger aggregate, during rough grinding it is easy to separate the aggregate from the gangue. It is advisable to use the two-stage flotation principle process of regrinding the two ends of the coarse concentrate (ie aggregate) or the two-stage flotation principle of regrinding the middle ore.<\/li>\n<\/ul>\n
- Ore genesis<\/strong>: Primary (e.g., sulfide\/oxide minerals) vs. secondary mineralization.<\/li>\n