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Click to add WeChatAs an important mineral resource, hematite is used by beneficiation plants to efficiently utilize hematite. With the continuous successful practice and application of new processes, new reagents, and new equipment, the combined beneficiation process developed with stage grinding, coarse and fine separation, and gravity magnetic separation-anion reverse flotation has been widely used in beneficiation plants around the world. The flotation process in the combined beneficiation process mainly processes the mixed magnetic concentrate of weak magnetic separation concentrate and strong magnetic separation concentrate.
When the strong magnetic separation concentrate achieves efficient positive flotation, the weak magnetic separation concentrate can use low-cost and high-efficiency magnetic separation process to obtain qualified concentrate, which can reduce energy consumption and improve separation efficiency. Because hematite positive flotation has the advantages of simple process, convenient operation and low production cost, it is widely used in beneficiation plants. The currently known hematite flotation process can be divided into alkaline medium flotation, acidic medium flotation, alkaline-acidic dual medium flotation, positive-reverse flotation process, shear flocculation and carrier flotation.
The alkaline medium flotation process uses sodium carbonate as an adjusting agent to adjust the pH value of the slurry to 9, the flotation temperature is controlled within the range of 30-40℃, and oxidized paraffin soap and tall oil are used as collectors. The specific process flow is: after grinding the raw ore, two-stage classification operations are carried out, and qualified materials are subjected to rough selection and multi-stage selection to obtain qualified iron concentrate, and the tailings are discarded.
The weak acid medium positive flotation process is suitable for stage grinding, gravity separation-magnetic separation-positive flotation process. The raw ore is subjected to a closed-circuit grinding operation to obtain qualified grinding products. These qualified products are classified by a hydrocyclone, and the sand is subjected to a coarse-fine-sweep gravity separation operation to obtain concentrates. The gravity separation tailings are discarded by sweeping magnetic tailings. The gravity separation ore is classified by the cyclone, and the sand is re-grinded and mixed with the cyclone overflow before returning to the coarse and fine classification cyclone for treatment. The overflow part is separated by a weak magnetic separation, a magnetic dewatering tank and a permanent magnetic separator to produce a weak magnetic separation concentrate. The weak magnetic separation tailings are discarded by strong magnetic separation, and the strong magnetic separation concentrate enters the acid positive flotation of one coarse and three fines.
The alkaline-acid dual medium positive flotation process organically combines the alkaline medium positive flotation process suitable for non-de-sludge flotation with the weak acid medium positive flotation process that is beneficial to improve selectivity, thereby improving the recovery rate of iron ore. The ore after grinding treatment is graded, and the qualified products enter the alkaline positive flotation and weak acid positive flotation treatments successively. The concentrate can be obtained after the two ends are selected.
The direct-reverse flotation process is to first use direct flotation to discard a large amount of low-grade ore mud, and then use starch to suppress iron minerals in the coarse concentrate, and then use anionic collectors to reversely float quartz. When this process is used to treat poor, fine, and mixed hematite, the artificial mixed ore is subjected to direct and reverse flotation processes and the hematite single mineral suppression of starch has been adsorbed with collectors can improve the separation efficiency of iron ore. This process has a huge effect on the treatment of weakly magnetic iron minerals.
Using sodium dodecyl sulfate as a flocculant for fine-grained hematite, the shear flocculation effect can make the fine-grained hematite form the best flotation particle size aggregate, and the coarse-grained hematite is used as a carrier for fine-grained hematite, which improves the flotation kinetics and significantly improves the total flotation recovery rate.
Carrier flotation, also known as piggyback flotation, is one of the effective methods for selecting fine-grained minerals. Its basic principle is to use coarse ore particles as carriers to carry fine-grained minerals, so that they adhere to the surface of coarse-grained minerals, and then use conventional foam flotation to separate them.
The above is a brief introduction to the hematite positive flotation process. In the actual production process, there are still many problems in the hematite positive flotation process. In order to improve the efficiency of hematite positive flotation, it is necessary to select flotation agents with strong collection ability. In addition, in order to determine the appropriate hematite positive flotation technology, it is necessary to determine the type of hematite. Xinhai Mining can customize the hematite beneficiation process and equipment for you to help you improve the production efficiency and economic benefits of the beneficiation plant.
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