Hematite is an important mineral resource. The mineral processing plant uses mineral processing technology to efficiently utilize hematite. With the continuous successful practice and application of new processes, new chemicals, and new equipment, the developed combined mineral processing process of stage grinding, coarse and fine separation, gravity magnetic separation-anion reverse flotation has been widely used in mineral processing plants around the world. The flotation process in the joint beneficiation process mainly handles the mixed magnetic separation concentrate of weak magnetic separation concentrate and strong magnetic separation concentrate.
When strong magnetic separation concentrates achieve efficient positive flotation, weak magnetic separation concentrates can use a low-cost and high-efficiency magnetic separation process to obtain qualified concentrates, 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 mineral processing plants. Currently known hematite positive flotation processes can be divided into alkaline medium positive flotation, acidic medium positive flotation, alkaline-acidic dual media positive flotation, forward-reverse flotation process, shear flocculation and carrier flotation.
The alkaline medium positive flotation process uses sodium carbonate as the regulator, adjusts the pH value of the slurry to 9, controls the flotation temperature within the range of 30-40℃, and uses oxidized paraffin soap and tar oil as collectors. The specific process flow is as follows: after the raw ore is ground, two stages of grading operations are carried out, qualified materials are subjected to rough selection and multi-stage selection to obtain qualified iron concentrate, and the tailings are thrown away.
The weakly acidic medium positive flotation process is suitable for the stage grinding, gravity separation-magnetic separation-positive flotation process. The raw ore undergoes a period of closed-circuit grinding operation to obtain qualified grinding products. These qualified products are graded by hydrocyclones, sand is settled, and a coarse, fine, and swept gravity separation operation is performed to obtain the concentrate. The gravity separation tailings are swept and magnetically thrown. , the gravity-selected ore after being classified by the cyclone is ground again, mixed with the cyclone overflow, and then returned to the coarse and fine classification cyclone for treatment. The overflow part undergoes a weak magnetic separation, a magnetic dewatering tank and a permanent magnet magnetic separator to produce weak magnetic separation concentrate. The weak magnetic separation tailings are thrown out after strong magnetic separation, and the strong magnetic separation concentrate enters the acidic positive flotation of one crude and three fines.
The alkaline-acid dual medium direct flotation process organically combines the alkaline medium positive flotation process suitable for non-desliming flotation with the weakly acidic medium positive flotation process that is beneficial to improving selectivity, thereby improving the quality of iron ore. recovery rate. The ore after grinding is graded, and the qualified products enter alkaline positive flotation and weak acid positive flotation successively, and the concentrate can be obtained after being selected at both ends.
The direct-reverse flotation process first uses forward flotation to throw away a large amount of low-grade sludge. The coarse concentrate uses starch to suppress iron minerals, and then uses anionic collectors to reversely flotate quartz. When this process is used to treat poor, fine, and miscellaneous hematite, the artificial mixed ore undergoes a direct and reverse flotation process and the hematite single mineral inhibition of the starch that has adsorbed the collector can improve the iron ore sorting efficiency. This process has a huge effect on the processing of weakly magnetic iron minerals.
Sodium lauryl sulfate is used as the flocculant of fine-grained hematite. Shear flocculation can make the fine-grained hematite form the optimal flotation particle size aggregate, and the coarse-grained hematite is used as the carrier of fine-grained hematite. , improve flotation kinetics and significantly increase the overall flotation recovery rate.
Carrier flotation, also known as piggyback flotation, is one of the most effective methods for selecting fine-grained minerals. The basic principle is to use coarse mineral particles as carriers to carry fine-grained minerals, making them adhere to the surface of coarse-grained minerals, and then separate them using conventional foam flotation.
The above is a brief introduction to the direct flotation process of hematite. In the actual production process, there are still many problems in the positive flotation process of hematite. In order to improve the positive flotation efficiency of hematite, it is necessary to select flotation reagents with strong collection capabilities. Additionally, in order to determine a suitable hematite positive flotation technology, the hematite type needs to be determined. Xinhai Mining can customize hematite mineral processing technology and equipment for you to help you improve the production efficiency and economic benefits of the mineral processing plant.
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