Hematite ore dressing technology

Hematite is a weakly magnetic iron ore, more beneficiation methods used, including joint reselection process, flotation, high intensity magnetic separation, several methods of roasting and [9].

At present, there are three typical beneficiation processes in hematite: continuous grinding, weak magnetic, strong magnetic, anion, reverse flotation, stage grinding, coarse subdivision, one weight, magnetic anion, reverse flotation, and stage grinding, a coarse subdivision. Select a magnetic one heavy anion reverse flotation.

Continuous grinding a weak magnetic-strong magnetic-anion reverse flotation process as shown in Figure 2

The main features of the process are:

(1) It has good adaptability to the mineralogical characteristics of iron ore. In view of the fine grain size of iron ore inlay and the need of fine grinding, the ore is ground by continuous grinding until all the basic monomers are dissociated, and the selection is made to avoid the fluctuation of the regrind amount of the ore in the stage grinding. The efficiency of Yamato does not have a negative impact on the process.

(2) The combination of weak magnetic-strong magnetic and anionic reverse flotation achieves the best combination of process flow. After continuous grinding, the primary and secondary slime in the grinding products are removed by weak magnetic separation and a large amount of tailings. This not only improves the grade of the iron selected for the anion reverse flotation operation, but also facilitates the anion reverse flotation to obtain the iron concentrate of the enamel landscape; more importantly, the weak magnetic separation and a strong magnetic separation operation throw away the primary slime. After the secondary slime, it creates a good process condition for the anion reverse flotation operation, which is beneficial to the anion reverse flotation operation to play a better role.

(3) The process is easy to obtain better selection indicators. At present, the equipment for strong magnetic operation is an ideal hematite tailing device. Anion reverse flotation is the most ideal helicer ore dressing to obtain high-grade iron concentrate.

Stage grinding, a coarse subdivision, one gravity, one magnet, one anion, reverse flotation process, as shown in Figure 3.

The characteristics of the process are: after the primary ore grinding, the hydrocyclone is used for classification, the coarse fraction and the fine fraction are separately treated; the coarse fraction is re-elected by spiral slip, and the coarse-grained qualified concentrate is obtained in time, and the ore dressing cost is low; The fine-grained grade uses weak magnetic-strong magnetic and reverse flotation; ensuring good selection index and high-grade fine-grain concentrate; re-electing the secondary grinding of the ore and returning to the cyclone classification operation. The concentrate size composition of the whole process is mainly based on re-election of coarse-grain concentrates. The amount of reverse-flotation alkaline fine-grain concentrate is small, unlike continuous grinding, and the strong magnetic-reverse flotation process is easy to cause filtration difficulties.

(1) A stage grinding process is employed. Since the process adopts a stage grinding process and a stage selection process, the process has a relatively economical beneficiation cost. After a period of grinding, the classification is carried out under the coarser particle size. Under normal circumstances, about 60% of the coarse-grained concentrate and tailings can be extracted, which greatly reduces the children entering the second-stage grinding, which is beneficial to reduce the cost. . At the same time, coarse-grained iron concentrate facilitates filtration.

(2) The selection is highly targeted. The dissociation of minerals during the grinding process is random. This process makes the mineral particles with different grinding grain sizes have dissociation conditions, which is the strong vitality of the coarse subdivision selection process.

One of the important foundations. Stage grinding, coarse subdivision selection, re-election, magnetic separation, anion reverse flotation process, the coarse fraction of the primary classification is relatively good, and the concentrate is obtained by a relatively strong magneto-anion reverse flotation process. Abandon the tailings. The effective combination of the coarse-grained beneficiation method and the fine-grained grade beneficiation method makes the process flow economically reasonable and technologically advanced. At the same time, the re-election process to obtain concentrates with larger content and coarser grain size is conducive to concentrate filtration.

(3) A narrow-level candidate has been achieved. In the mineral selection process, the degree of mineral selectivity is related to both the mineral's own characteristics and the specific surface area of ​​the mineral particles. This effect is more prominent in the flotation process. Because during flotation, flotation is related to the minimum force of the agent and mineral and the agent to the bubble, and is related to the specific surface area of ​​the mineral, and to the ratio of the area of ​​action of the agent and mineral. This makes the factors affecting the floatability of minerals double, and it is easy to cause minerals with large specific surface area and relatively difficult to float. The minerals with small specific surface area and relatively easy to float have relatively uniform floatability, and sometimes the former even has better Floating. The beneficiation process that achieves the narrow-level selection can largely eliminate the above-mentioned chaos that is easy to cause the flotation process, and improve the beneficiation efficiency.

Stage grinding, a coarse subdivision, a magnetic one heavy anion, an anion reverse flotation process, as shown in Figure 4.

The process characteristics of the process are:

(1) A stage grinding process is employed. Due to the stage grinding process, the second stage grinding amount is reduced.

(2) Strong magnetic pre-throwing. Strong magnetic pre-dumped tailings are generally 45%

The above has greatly reduced the number of follow-up jobs for mineralizers and saved equipment. At the same time, after the pre-throwing of the strong magnet, the ore selected for the subsequent strong magnetic operation is relatively inferior, which is conducive to the re-election operation to improve the grade of the concentrate. However, the relatively coarse lean organisms enter the strong magnetic concentrate, which aggravates the anti-enrichment effect of the subsequent classification cyclone, which is unfavorable for the reverse flotation operation.

The Qidashan Iron Ore Concentrator uses a staged grinding and coarse subdivision to select a primary ore with a copper grade of 28.55%, and obtains a concentrate grade of 67.56% with a recovery rate of 78.92%. The treatment process of oxidized ore in the first phase of the Sijiaying Iron Mine is: phase grinding, coarse subdivision, one re-election, one strong magnetic and one reverse flotation process, the original ore iron grade is 30.44%, and the antimony ore iron grade is 66.00%. The iron recovery rate was 80.00%. The Baiyun Ebo uses a continuous grinding, a weak magnetic, a strong magnetic and a reverse flotation desulfurization process, the original ore grade is 32.67%, the tip iron grade is 64.39%, and the iron recovery is 74. 35%.

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