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In iron and steel industry, stable supply of iron ore is very important. With the development of science and technology, the research on comprehensive utilization of micro fine iron mineral is of great significance to expand the industrial utilization of iron ore resources and ensure the sage supply of iron ore resources. During the development of micro fine-grain iron mineral processing process, here are five aspects need to concern.
Use the table of contents below to navigate through the guide:
In the fine-grained iron ore processing technology, the phenomena of insufficient grinding and over-grinding exist at the same time. This problem is caused by simply relying on mechanically reducing the size of ore particles to increase the degree of dissociation. The key point is the content increasing of quality particle sizes which is conducive to iron mineral processing. Therefore, it is of great significance to carry out targeted grinding of fine-grained iron ore, which can classify the dissociated quality materials as soon as possible to reduce the problem of over grinding and improve grinding efficiency. Effective selective grinding enable enlarge the particle size of coarse grinding process to avoid over crushing. And the entered minerals can be optimized to meet the required grade and recovery rate.
In order to fine grinding with high efficiently, it can change the ball mill structure, grinding machine linear shape and grinding media,etc. Because of high energy consumption of ball mill, the particle size of grinding products should be limited in some range. The grinding efficiency of micro fine-grain iron ore is lower and its energy consumption is higher. If the range of grinding particle size is wilder, the over grinding will be more serious. Therefore, it should select more suitable type of fine grinding machine to improve the particle size composition of grinding products and reduce the energy consumption at the same time.
It mainly reflect in selection and use of strong magnetic separation machine. The vertical ring pulsating high gradient strong magnetic separator and flat ring strong magnetic separator is widely used in the application of fine grained weak magnetite. When processing, the pulsation mechanism drives the pulp to generate pulsation, keeping the ore particles in the separation area in a loose state. At this time, magnetic particles are more easily captured by the magnetic media, nonmagnetic particles pass through the magnetic medium into the tailings as soon as possible. Flat ring strong magnetic separator has high selection magnetic field strength, good recovery effect on fine grain minerals and high recovery rate.
In the flotation process of fine-grained minerals, there are a series of problems such as low mineralization efficiency, large consumption of chemicals due to fine mud cover, serious mechanical inclusions, and reduced air bubble loading capacity. The flotation column has shown great advantages in the flotation of fine-grained ore. Because the bubble particles of the micro-bubble flotation column are much smaller than the flotation machine, and based on the multiple sweeping action of the circulating pulp, better results have been obtained in the application of fine-grained weak magnetite. The main reasons for the good separation effect of micro-bubble flotation column on fine-grained iron ore are as follows:
Due to the small diameter, the micro bubbles around more laminar state, making fine materials easy to adsorb and not easy to fall off. Moreover, the smaller the bubble size, the more the number under the same inflation capacity. The bubble specific surface area per unit of inflation is larger, which directly increases the attachment opportunity of bubbles and mineral particles, and improves the ability of flotation recovery.
It is considered that the mineralization collision probability is proportional to the quadratic square of the bubble diameter. The flotation rate constant is inversely proportional to the cubic square of the bubble diameter. Obviously, the formation of microbubbles is an important condition to achieve fine material sorting.
Due to the fine particle size of hematite, the morification is serious in the process of fine grinding. Therefore, the anionic reverse flotation technology of ore-resistant sludge is widely used in China. NaOH, the caustic starch, lime and fatty acid collector four pharmaceutical system has also become a classic pharmaceutical system. On this basis, progress has been made in other gangue mineral agents such as chlorite and amphibole, which is of great significance for fine weak magnetite sorting.
The above are five aspects that need to pay attention to in the development of fine iron ore mineral processing. At present, with the gradual refinement of the selected iron ore particles, most iron ore concentrators will adopt the joint process composed of various beneficiation methods for selection. Therefore, for the fine particle iron ore beneficiation, it is suggested to tailor the own process through the beneficiation test, and rationally select the appropriate iron ore beneficiation method according to the final beneficiation test report.