The progress and development of China's iron ore beneficiation technology

China's iron ore resource supply situation

With China's sustained and rapid economic development, the steel industry is developing rapidly. The rapid growth of domestic iron and steel enterprises ore demand, domestic mine production is far from meeting the

Not demand, and had to rely on foreign high-quality iron ore resources. According to statistics, in 1985 China's imports of iron ore exceeded 10 million tons in 2002 exceeded 100 million tons in 2004

Exceeded 200 million tons in 2005 from January to July total imports of iron ore reached 200 million tons . Dry Magnetic Separator

The magnetite resource domestic iron ore resources SimpleChoice diminishing pressure to make full use of domestic resources, improve self-sufficiency rate of the iron and steel enterprises ore to ease imported iron ore

Force to maintain the high quality iron ore supply of raw materials, to the progress of science and technology to promote the efficient development and utilization of depleted iron ore resources. China's iron ore deposit types, storage conditions re-

Miscellaneous types of ores, the high content of sulfur, phosphorus, silica and other harmful component, multi-component symbiotic iron ore accounted for a large proportion, and the useful components disseminated fine grain size,

Mining difficult, low efficiency, poor product quality.

For decades, the majority of mineral processing workers for the "poor, small, miscellaneous features of China's iron ore resources to carry out a lot of research work to solve the many technical difficulties, so that our iron

Ore beneficiation technology by leaps and bounds of progress and development, the overall level has greatly improved. Especially in recent years, the development and successful application of new efficient sorting equipment, new efficient floating

Selected pharmaceutical and separation process. The breakthrough has been made so that the beneficiation process indicators.

The magnetite beneficiation technology progress

The magnetite beneficiation of iron ore beneficiation main domestic iron ore concentrate production of magnetite concentrate and about 3/4. Magnetite beneficiation technology over the years continuous development and progress, the magnetic

Iron ore concentrator production targets have been greatly improved concentrate grade from 60% to 65% to 67%. Steel industry increasingly high demand for raw materials, Wai

Around "to raise iron content and reduce silicon" domestic done a lot of research and development work, magnetite concentrate grade increased to 68.5% from 65% the Si02 from 8% to 9% to 4%. New type of magnetic separation equipment

The application and promotion of anti-flotation process to raise iron down the main direction of the silicon.

The application of a new type of magnetic separation equipment

(1) magnetic reunion re-election machine

The device in early 1985 successful trial in Shuichang the industrial test and get a good separation efficiency. The entire sorting area to form a suitable

When the magnetic field intensity distribution, the relatively uniform weak magnetic field, the magnetic field gradient is small. Sorting of magnetic particles and gangue particles depends primarily on the size of gravity and rising current forces. Magnetic group

Poly re-election process of industrial production practice shows, the device can improve the concentrate grade 2 to 3 percentage points. In addition, Shougang Mining Company developed conditioners and electric adjustable magnetic reunion re-election

Magnetic agglomeration machine, Shougang the Dashi iron ore concentrator has been.

(2) magnetic separation column

Magnetic separation column Anshan University of Science and Technology successfully developed a new type of highly efficient magnetic separation equipment, materials fed into the magnetic part in the weak magnetic field under the action of a weak magnetic agglomerate in the magnetic

And the combined effects of gravity downward movement, upward movement in the rise of the role of water and mixed in the gangue, magnetic agglomerate in the downward movement of the process by repeatedly washing.

The grade gradually increased. The device in Benxi Iron Nanfen concentrator and Waitoushan of Concentrator, Jilin Banshigou concentrator has been applied. Northeastern University, developed a successful pulse oscillating magnetic field magnetic

Choice column, the device coil formation constant top-down "movement" of the oscillating magnetic field. Strong vibration magnetic field with a strong upward flow combined to basically eliminate the magnetic

Inclusions, a substantial increase in the grade of iron concentrate. Different current conditions in the laboratory the concentrator Benxi Iron and Nanfen, the fine sieve to the ore sorting, can improve the grade of 3.54 to 8.27

Percentage points. The device has been used in the selection of Dandong of boron iron ore in the production of super iron ore concentrate factory in Chaoyang.

(3) Low-field self-weight media Jig

University of Science and Technology Beijing mineral processing chamber after years of study, the development of low field strength weight media Jig, magnetic, jig combined with heavy media beneficiation. As magnetite fine

Sorting equipment. 300mm small devices developed in 2000 for improve Shuichang concentrator iron concentrate grade. Industrial shunt test results: feed grade 62.64

% Concentrate grade of 68.27%, 91.72% of the jobs recovery. pot magnets

(4) low field strength pulsating magnetic separator

Low field strong pulsating magnetic separation of machine successfully developed by Maanshan Institute of Mining Research, has the following characteristics: magnetic system angle. Number of poles; magnetic flux density is lower, and from the sweep constituency to the fine

Mine discharge area from high to low was uneven; features permanent pulsation device, formed in a rotating cylindrical surface permanent magnet pulsating magnetic field to loosely magnetic reunion, excluding the inclusion pulse

Stone. The device the the Jiuquan Steel concentrator, Anshan Iron and Steel Dagushan concentrator industrial test results show that better throw fine-grained gangue and lean with the living body.

(5) The a BX multi-pole magnetic separator

BX multi-polar magnetic separator successfully developed by the Design Institute of Baotou application of new materials, Gongchangling concentrator application showed that BX magnetic separator concentrate grade than the original magnetic separator 4

. 7% lower tailings grade of 0.5%, tailings magnetic iron decreased by 0.62%, Last mineral was 12.66%. In Dagushan industrial trials, tests showed that the

Improving quality and effect is obvious: the ore grade of 29.73%, concentrate grade of 67.44%, 10.25% of the tailings grade metal beneficiation indicators of recovery of 77.27%.

2 magnetite anti-flotation process application

To mention the quality of siliceous gangue magnetite concentrate. The reverse flotation desiliconizing good way. Eagle's Nest concentrator grade iron ore reverse flotation of 65.15%. With Si028

%. Maanshan Institute of Mining Research for the ore using a coarse and a fine sweep process anionic reverse flotation to raise iron content and reduce silicon, reverse flotation concentrate iron grade 68.

18%, S1024%. Gongchangling concentrator magnetic separator the final product TFe grade of 65.5% cationic reverse flotation of magnetic concentrate re-election, flotation concentrate products

The bit reached 68.8 percent, Si023.90 iron recovery 98.50% e. Lunan Mining Company concentrator using anion reverse flotation of magnetite concentrate grade increased from 64

% To 67%.

Wuhan University of Technology has developed a new type of low-temperature-resistant cationic collector GE-601, overcome of dodecylamine and other blistering large amount of foam sticky, difficult foaming, foam products intractable

Shortcomings. Reverse flotation of a magnetic separation of magnetite concentrate obtained at a temperature of 22 ° C when indicators: iron concentrate grade of 69.31%, 97.90% recovery; 12 ° C low temperature conditions

Obtained under normal temperature conditions consistent good indicator of: concentrate Fe grade of 69.17%, the recovery rate was 97.87%.

The hematite beneficiation technology progress

Hematite iron ore (including magnet - mixed hematite ore) is an important iron ore resources. The early 1960s, the major domestic processing red roasting - magnetic separation and single - flotation process

Iron ore, production and technical indicators are worse. Through continuous technological transformation indicators improved. In recent years, some new technology, new equipment, new agents successfully developed and

The application of hematite mineral processing technology made a major breakthrough.

1Slon vertical ring pulsating high gradient magnetic separator

Ganzhou Nonferrous Metallurgy Research Institute developed a the Slon type pulsating high gradient magnetic separator. After 20 years of continuous improvement, has good stability and good sorting, wide

Pan used in China's red ore beneficiation.

Anshan Iron and Steel Diaojuntai concentrator application of SLon-2000 vertical ring pulsating high gradient magnetic separator instead of the original flat ring strong magnetic separator, iron concentrate grade increased by 1.19 percentage points, the tail

Ore grade decreased by 1.56 percentage points, iron recovery rate increased by 8.19 percentage points. From In 2001-2004, Qidashan concentrator process transformation Slon-

1750 Magnetic control of fine particles tailings grade. Slon-1500 magnetic machine control the spiral chute tailings grade. New processes iron ore concentrate grade of 67.50%, iron

The recovery rate of 78%. Slon-1750 vertical ring pulsating high gradient magnetic machine is used to control the the spiral chute tailings grade, throw some coarse tailings in advance East Anshan sintering plant,

The whole process of the mining cycle reduced by 161.56% to 90%.

Magnetic Separator in slag extraction of iron powder in

Slag by the tumble dryer drying slag moisture content of less than 1.5%, after drying the slag into the solenoid to the porcelain pre-magnetization, and then fed to the homogenizing silo

Homogenization, storage, and can be dry to the grinding, the particles larger than 3 mm steel and slag powder separation of less than 3 mm and 3 mm steel slag separator

Machine for wind powder, slag powder is divided into more than 180 mesh and less than 180 mesh two particles, will be greater than 180 mesh particles into the binoculars dry permanent magnetic separator for ferromagnetic

Election, magnetic separation after the steel slag off the magnetic the electromagnetic DEMAGNETIZER slag powder, in order to reduce the slag powder than the susceptibility, the lifting of magnetic reunion, then demagnetized steel slag into the

Ball mill for fine grinding to 180 mesh, with the powder the slag iron powder and slag powder separation. The technical process with low cost production process, do not pollute the environment, excellent

Point

Wherein: the iron content of about 30%, a particle size of 0-12mm, about 10% aqueous slag, slag so that the water content is less than 1.5, tumble dryer drying

%, After drying slag into the solenoid to the porcelain pre-magnetization, and then fed to the homogenizing silo homogenization, storage, and then dry to grinding 3 mm or more

Particles of steel and steel slag separation of less than 3 mm, the particles steel products, and less than 3 mm steel slag powder machine wind powder, slag powder is divided into

Greater than 180 mesh and less than 180 mesh two particles will be greater than 180 mesh particles into the binoculars dry permanent magnetic separator for iron magnetic separation, the slag iron slag powder and slag powder

The separation of slag iron powder products, magnetic separation of steel slag with the electromagnetic DEMAGNETIZER demagnetization of steel slag powder, in order to reduce the slag powder than the susceptibility, the lifting of the magnetic reunion

, Then demagnetized steel slag into the ball mill for fine grinding to 180 mesh, separating the powder the slag iron powder and slag powder, slag iron powder and slag Micronized products.