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2019 copper molybdenum lead zinc fluorite gold ore flotation machine

flotation conditioners of oxidized zinc and lead ore

flotation conditioners of oxidized zinc and lead ore

Oxidized zinc and lead minerals have many kinds. There are 9 kinds of oxidized lead minerals, mainly includes cerusite (PbCO3) and vanadinite (PbSO4). There are 13 kinds of oxidized zinc minerals, mainly includes smithsonite (ZnCO3) and willemite (Zn2SiO4).

The flotation method of oxidized lead minerals is generally collecting the minerals with xanthate after sulfuration, and the flotation method of oxidized zinc minerals is collecting the minerals with amine collectors after sulfuration. The use of flotation conditioners process can increase the selectivity of the flotation process, enhance the effect of the collectors, and improve the conditions of the ore pulp.

Oxidized ore is generally formed by ionic bonding, and is highly hydrophilic. It is not easy to float oxidized ore with xanthate collector. After sulfuration with sodium sulfide, a highly hydrophobic sulfide film is formed on the surface of the oxidized ore. This film is easy to act with the xanthate collector, which makes oxidized ore activated and then floated.

The activation of oxidized ore by sodium sulphide is mainly caused by sulfur ions, and the S2- ions undergo a displacement reaction with anions on the surface of the oxidized ore to transform the surface of the ore particles from oxides to sulfides.

Commonly used sulfurizing reagents are Na2S, K2S, BaS and CaS. According to the reports, their order of efficient is K2S, >, Na2S, >, BaS, > CaS, while the mixed effect of Na2S and K2S is great. Most commonly used sulfurizing agents are Na2S and K2S, which have similar effects and are often mixed.

When the oxidized zinc ore is floated with an amine collector, it is difficult to separate the gangue minerals mainly composed of zinc oxide and calcium magnesium carbonate. At the same time, the presence of ore slime also affects the flotation using amine collectors. Therefore, adding targeted inhibitors of gangue mineral during flotation can increase the recovery rate of oxidized zinc ore.

A large number of experiments have shown that hexametaphosphate can effectively inhibit quartz and dolomite gangue; water glass has the best inhibitory effect on sericite, chlorite and iron gangue; sodium humate has a good inhibitory effect on carbonate gangue and limonite silicate; polyacrylic acid can strongly inhibit calcium carbonate and magnesium carbonate ore; carboxymethyl cellulose has a good inhibitory effect on clay slime.

The activators can form a film on the surface of the mineral that promotes the action of the collectors. It is generally considered to have the following effects: dissolving the inhibiting film on the surface of minerals; forming a poorly soluble activated film on the mineral surface due to a chemical reaction of exchange adsorption or displacement; eliminating the harmful effects of inhibitory ions in the ore slurry.

Ammonium sulfate activates the flotation of oxidized zinc ore using xanthate and increases its flotation recovery rate. Salicylaldoxime, a-benzoin and ortho-hydroxybenzoic acid have an activation effect on flotation of calamine.

Oxidized lead and zinc ore can be recovered by selective flocculation process, especially fines and slime. If using the selective flocculation method to separate the ore, the recovery rate will be greatly improved.

Selective flocculation mainly uses high-molecular flocculants to bridge the fine particles into an arbitrary, three-dimensional, loose, porous floc. If more than two kinds of minerals or minerals and gangues exist, the high-molecular flocculant would only selectively flocculates with one of them, while the other is still in a dispersed state, thus separating the two minerals or minerals from the gangue.

For example, the results of dispersion and flocculation behavior of fine-grain (-0.020mm) smithsonite, quartz and its mixed ore (1:4) show that at pH=7, using sodium humate and tannin extract as dispersants and 2PAM30 (hydrolyzed polyacrylamide) as selective flocculant. The flocculant is adsorbed on the surface of the smithsonite by chelation, flocculates the smithsonite, and does not flocculate the quartz, thus abtaining a better separation effect.

The above four reagents are commonly used conditioners for the flotation of oxidized lead and zinc ore. After being sulfurized, and then adjusted according to the nature of the ore, the oxidized lead and zinc ore can be collected according to the collecting principle of sulfide ore with collectors such as xanthate.

summary of fluorite ore flotation process - jxsc machine

summary of fluorite ore flotation process - jxsc machine

Taking deep research on the features, extraction methods, and fluorite mining machines have a significant positive effect on running the fluorite processing plant successfully. In the following paragraphs, I have made a detailed introduction from fluorite mineral attribute to extraction methods and machines and listed 2 cases for your reference.

Fluorite (also called fluorspar) is a mineral that common in nature, consists mainly of calcium fluoride( CaF2), can be symbiotic with many other minerals. More in wiki https://baike.baidu.com/item/%E8%90%A4%E7%9F%B3/258531?fromtitle=%E8%90%A4%E7%9F%B3%E7%9F%BF&fromid=8815755&fr=aladdin

Just as is the case with almost ore processing and non-metal beneficiation, the concentrate fluorite is extracted by crushing, sieving, grinding, grading, flotation, filtration, drying, etc. How to realize the high-efficiency sorting of associated fluorite ore is a real problem in the fluorite beneficiation process. Therefore, based on the characteristics of the associated fluorite ore, summarized the beneficiation method and floating agent of the types of associated fluorite ore. We, the JXSC mining machine factory, would be delightful provide you with the flotation machines.

The separation of quartz and fluorite achieved by grinding, it is an important factor affecting the flotation of quartz-type fluorite. The ground ore of a coarse size indicates that may have many associated fluorite ore lumps, these lumps may increase the silica content, decrease the flotation effect. If the grinding particle size is too fine, although quartz and fluorite have been dissociated from the monomer, it will cause the fluorite losing easily, thus reduce the recovery rate of fluorite.

In order to dissociate the fluorite from the quartz and not to pulverize the fluorite, the stage grinding process is generally used, which can reduce the silicon content in the fluorite concentrate after flotation and increase the fluorite recovery rate.

The results show that under the same conditions of grinding fineness, the fluorite concentrate by rod mill obtains a lower Si O2 content. Compared with ball milling, the particle size of rod grinding is more uniform, rod mill control the grinding fineness better.

In order to solve the difficulties in the separation of high calcium quartz fluorite ore, researchers did a great time of experiment. Studies have shown, the fluorite beneficiation effect of 97.21% concentrate grade and 69.04% recovery rate can be obtained when the condition of -0.074 mm grain taking 83.62% percentage, flotation 6 times, the PH value of slurry is 9-10YN-12 as the capture agent, sodium silicate, tannic and the Calgon as the inhibitors. When the PH value is 6, the sodium oleate has a significant effect on the recovery of pure fluorite minerals during the flotation process. However, when the slurry contains fine-grained quartz ore, the performance of sodium oleate to capture fluorite decreases. The capture ability of the oleic acid gradually improved by adding the sodium hexametaphosphate to disperse the quartz and fluorite. In a word, fine-grained quartz type fluorite ore is better to adopt the stage grinding process method to get the best size. Besides, it is best to use Na2CO3 to adjust PH value, choose oleic acid, oxidized paraffin, sodium silicate as a combination of collector and inhibitor.

Calcite type fluorite ore mainly consists of fluorite, and calcite( more than 30%). Since both calcite and fluorite are calcium-containing minerals, they have similar surface physicochemical properties. When coexisting in solution, they are prone to the mutual transformation between minerals, making separation of the two difficult to achieve.

Fatty acid collectors can float both of calcite and fluorite, therefore, it is needed to adjust the PH value of slurry. Practice shows that the PH value has a great impact on the flotation. When the PH value in the range of 8-9.5the fatty acid collectors can display function both of the fluorite and calcite. But in the weak acidic medium, the calcite has a lower floatability. Although it is difficult to separate calcite and fluorite by flotation, we still have chance to realize it by adjusting the PH value, choosing suited inhibitor(sodium silicate, salinization sodium silicate, acidification sodium silicate, Calgon, lignin sulfonate, dextrin,tannin, etc.), and using oleic acid as the trapping agent.

The barite type fluoride ore mainly consists of barite(10%-40%) and fluoride, also associated with iron pyrite, gelenite, sphalerite, and other sulfide minerals. It is not easy to separate the barite and fluoride because of the similar floatability. In general, the flotation process of the barite type fluoride ore is divided into two steps, one is combination flotation that obtains the combination of concentrate both of barite and fluorite, another is flotation that separation the barite and the fluorite from the combination concentrate.

Flotation of the first step: Na2CO3 as the conditioner of PH value, oleic acid as the capture agent, and sodium silicate as the inhibitor. Flotation of the second step has two ways: 1 Inhibiting barite and floating fluorite: inhibitors have lignin sulfonate, sodium silicate, NAF, dextrin, aluminum salt, ferric salts; captor has oleic acid. 2 Inhibiting fluorite and floating barite: adjusting the PH value the slurry to strong alkalinity by the sodium hydrate, using the citric acid, barium chloride, ammonium salt, sodium silicate as the inhibitors, and using the oleic acid or sodium alkyl sulfate as the collector.

The mineral composition of sulfide-type fluorite is similar to that of quartz type fluorite, but the content of the metal mineral is higher than that of the quartz type, and sometimes, the content of lead and zinc can reach the industrial grade. Therefore, it is necessary to take the recovery of the other metal mineral into considered. Usually, adopt the captor for sulfide minerals to select the metal sulfide minerals preferentially, then use the captor of fatty acid to recover the fluorite from the flotation tailings. In addition, roasting, leaching, and other processes can also help to extract valuable metals and to decompose fluorite.

A great deal of research and production practice shows that flotation is a useful method for recovering fluorite ores, suit for large scale fluorite ore processing, the beneficiation method( flotation process and chemical agent) varies from the ore characteristics. if you need a fluorite ore flotation machine, pls contact us.

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