Problems and Prospects for the Development of China's magnetite beneficiation

   Magnetite iron mineral reserves in China accounted for a large proportion reached 48.8%. To identify reasonable

beneficiation process and processing equipment to deal with magnetite mine for our country and the entire steel

industry has a very important significance. In recent years, the beneficiation workers in China after unremitting efforts

magnetite beneficiation process and equipment has been greatly developed grade iron ore has been greatly improved.

The individual concentrator has reached 70%, the national average increase of more than l%; impurity content

decreased significantly, some concentrator application of a single magnetic separation silica content dropped to less

than 2%. Iron and create favorable conditions, but also the development of the mine. n52 neodymium magnets

    The following is a problem, as described below:

    The fineness of the grinding product is not reasonable dissemination size of magnetite material is very uneven,

ranging from a few microns to a few millimeters, and the same problem exists in the same mine the same ore body

brought to the processing operations difficulties. The process for the separation of magnetite Monomer to process

requirements, it will have to minimize the dissemination size as a standard for grinding, its result, part of the mineral

grinding.

       Mineral grinding mineral particles key force greater than its own inertia force, the beneficiation process becomes

not do anything, the consequences are lower concentrate grade and reduced metal recovery, the reason for the

existence of such phenomena, the following factors. (1) a single grinding equipment. Grinding equipment in China a

single species, and the concentrator can only choose several types on the market today only, nothing more than self-

mill, ball mill, rod mill. Autogenous grinding its selective grinding role beneficiation optimistic about the workers, but its

hard grind the presence of particles gave created a significant obstacle to the popularization and application. This is

because dealing with the hard grind particle crushing system to enter the restricted iron is very strict and difficult to

achieve non-ferromagnetic metal is removed, the ferromagnetic metal and difficult to separate the magnetic minerals,

stone crushing system is difficult to run, since The mill's production capacity can not be increased, can not meet the the

beneficiation production requirements, thus limiting the autogenous mill in the popularization and application of

magnetite Hill. Accurate iron removal device, and the stone crushing system to relax the restrictions on the iron

boundaries, the direction of future research.

      Beneficiation of domestic workers and equipment manufacturers in recent years, research in this area, and

received some effect. For example, the column mill has been in field trials, obtain some very important data, laying a

foundation for future research. Ball mill In addition to the specifications, the range of choice is limited. Domestic in this

area due to inadequate attention invested little beneficiation workers have no choice. The result is that only processes

to adapt to the equipment, beneficiation process can not be optimal.

     Foreign roller mill, the Aisha grinding, mixing mill, the beneficiation workers in recent years a number of studies, still

stuck in the pilot phase, to promote the application of certain difficulties because of its high cost, the real into the

beneficiation process There is no precedent. Domestic column mill in recent years developed a new grinding

equipment for mineral processing workers, such grinding equipment has its unique role in the mineral grinding, and

low cost, low cost of grinding, beneficiation workers a new idea for grinding opened up a new path. Before entering the

market in recent years, and magnetite is still in the pilot phase, the quality of its design, manufacturing precision, wear-

resistant materials, the ability of continuous operation, can be manipulated to be further improved. Its processing

power is also very small, is not conducive to large-scale production, into a study should be in large-scale equipment

clearance adaptive. Reduce the number of manual adjustment. So as to promote the application of the magnetite plant.

     (2) grinding operations to the mineral particles is too wide. The grinding process generally is a two-stage grinding

media choice is very difficult. Targeted particularly strong choice grinding media difficult to do, can not be achieved

targeted grinding, cause some mineral overground, to sorting operation caused great difficulties. Blind pursuit of short

process also contributed to this situation is an important factor. This is a misunderstanding, the direction of our

research should be increased grinding segment, to the mineral particles narrow level, the grinding medium of choice

more targeted to improve grinding efficiency by improving each piece of the overall grinding efficiency, so The

consumption does not increase.

     (3) grading operations to be further improved. Of magnetite concentrator applications grading equipment spiral

classifier, water spiral, high-frequency fine sieve. The spiral classifier most of the concentrator has been applied,

because in recent years the price of iron concentrate market to improve the grade fare increases,magnetic pulley prompting people to

pay more attention to improve the grade of iron concentrate, spiral classifier classification efficiency is low, the reverse

The shortcomings of the rich class people paid special attention, in some concentrator has been some other device

instead, will eventually be eliminated.

      Water spiral is being applied to a large number of concentrator for grading equipment, but also there are some

problems: First, the water screw machine is the use of the gravitational field classification, which requires water spiral

gravitational field is stable. Such minerals can be accurately graded, but we are now automatic control level is difficult to

do so by the a stable gravitational field, the precise classification can not be achieved within the water spiral; due to

application of misunderstanding on the water spiral mineral particles is too wide, will inevitably result in the density of

large particles with large density of small particles mixed with the same can not be accurately graded. This limits the

use and development of water conservancy spiral.

     The direction of future research should be placed on self-control, so that the gravitational field of the water spiral

remained stable. In order to make the water spiral give full play to its unique features, in order to achieve the purpose of

accurate classification. In recent years, high-frequency fine screen in the magnetite concentrator is a wide range of

applications, has played a very important role to raise iron impurity reduction. Foreign high-frequency fine sieve

structure is more reasonable, screening efficiency is relatively high, but the cost is high than the domestic many

applications in the mining less. In recent years, domestic high-frequency fine sieve manufacturer made a lot of work,

and achieved good results. Concentrator application of domestic equipment in recent years has also been a relatively

good results, but the device itself that there are some problems in the application of its advantages did not play very

well. First sieve qualified fraction content is high, the screen excessive wear and tear.