Hematite ore processing plant Nigeria

Hematite ore intro

Hematite iron ore deposits are currently exploited on all continents except Antarctica, with the largest intensity in South America, Australia and Asia. Most large hematite iron ore deposits are sourced from altered banded iron formations and rarely igneous accumulations.

Hematite iron is typically rarer than magnetite bearing BIF or other rocks which form its main source or protolith rock, but it is considerably cheaper to process as it generally does not require beneficiation due to its higher iron content. However, hematite ores are harder than magnetite ores and therefore require considerably more energy to crush and grind if beneficiation is required. Hematite ores can also contain significantly higher concentrations of penalty elements, typically being higher in phosphorus, water content (especially pisolite sedimentary accumulations) and aluminium (clays within pisolites). Export grade hematite ores are generally in the 62–64% Fe range.

Hematite iron ore beneficiation equipment supplier

SBM Company as a manufacturer of hematite mining and crushing equipment has been focusing on hematite iron ore localization solution especially hematite beneficiation plant. Except for the main iron ore mining countries such as China, Australia, Brazil, India, Russia, Ukraine, South Africa, Iran, USA, Kazakhstan, Sweden, etc, SBM Company has designed a whole series of iron ore mining solution as well as iron ore mining equipment such as primary jaw crusher, secondary cone crusher, fines powder mill, vibrating screen, in other iron ore mining countries such as Vietnam, Indonesia, Malaysia, Pakistan, Nigeria, etc.

Hematite ore beneficiation processing

The principal hematite iron ore beneficiation course of action incorporates:gravity separation,flotation,sturdy magnetic beneficiation or mix many beneficiation process,and one more method is magnetization roasting and after that weak magnetic separation. The early hematite iron beneficiation largely made use of the gravity separation course of action,and also the key machines are:jigger,centrifugal separator,spiral chute,spiral washing machine,shaking table etc. For the reason that some other beneficiations’ production capacity was small,the grade immediately after processing was low,recovery ratio is low and then was dumped as time goes on.

Hematite Iron ore crusher and Hematite iron ore grinding machine will be the very first step in Hematite iron ore processing plant. Ore crushed by means of the thick, the block is no more than 1m, and then through the medium and fine crushing and screening ore particle size less than 12mm into the final item sent to the grinding grooves. Hematite ores in large lumps should be sized into required dimension through primary crushing and secondary crushing. Grinding process would also be conducted if necessary in the following steps.

Hematite Beneficiation Process

Hematite is weak magnetic. It contains mainly Fe2O3, concluding Fe70 %, O 30%, which is the major iron ore. Based on the test report of ore provided by customer, we designed this hematite dressing technics: three stages crushing----one stage milling----two stages magnetic separation---- dehydration----final product. Using this technics, we can improve the Fe content from 40% up to 65%. And the ferric oxides recovery ratio is about 80%.

1.Hematite ore crushing: in this stage there are also three steps, the hematite ore may go through primary crushing, secondary crushing and fine crushing. Hematite primary crushing equipment includes gyratory crusher, jaw crusher, hammer crusher etc. Hematite secondary and fine crushing plants mainly include cone crusher, ball mill, vertical mill, ultrafine mill etc.

2.Main operation steps in the whole hematite beneficiation process include sorting, gravity separation, floatation, magnetic separation, electrostatic separation, chemical mineral processing etc. There are many plants involves in hematite beneficiation process, such as flotation equipment, magnetic separator, electrostatic separator etc.

3.The treatments of refined hematite mineral include dehydration, tailing disposal, backwater etc. Thickener and dryer are important plants in this stage.

Hematite Ore Separation

In the technology of hematite ore separation, gravity concentration draft, flotation separation, magnetic separation and roasting-magnetic separation are adopted. Flotation separation and electric separation are made as selective operation. According to different properties of ores, various forms of dressing processes are composed . When magnetization-roasting- magnetic separation is combined with other technologies, it is similar with magnetization and roasting of the single low-intensity magnetite. However, powder ore separation adopts the combined process of low-intensity magnetic separation and other technologies.

Gravity Concentration Draft

Gravity concentration draft selects ores in accordance with density contrasts of ores. Among all the washing & dressing plants of hematite ores of the day, hematite ore dressing plants and gravity concentration draft of specularite play important roles. The superiority changing for a time, but after a long period of development, gravity concentration draft [will]exceeds flotation separation and magnetic separation, in the aspect of ore throughput. It aims at coarse-sized ores, and is predominant in the preconcentration & application of coarse-sized ores, and the separation of fine slime.

Flotation Separation

According to different surface physicochemical properties of ore particles, flotation separation can be used to separate valuable minerals from ores.

Flotation separator is the main equipment of flotation draft. It is a single chute or made of multiple-chute connected in series. The agitation and aeration of ore pulp, the adhesion of bubbles and ore particles, the scrap and overflow of froth bed formed when bubbles rise and other process all happened in flotation cell.

Flotation separation is suitable to treat materials of fine or superfine particles. It can recover ore particle that is smaller than 10μm, while other dressing methods cannot. Some special flotation separation drafts, which handle superfine particles, can recover even smaller ore particles. Superfine flotation draft and ion flotation draft can recover grains ranging from colloidal solids to all kinds of materials in the forms of molecule and ion. Flotation separation can be used to select intermediate products, volatile matters of thermometallurgy and useful composition in slag. Also, it can be adopted to treat residue of hydrometallurgy and substituted precipitum, recover chemical products (such as paper pulp, surface-active substances, etc) and inorganic and organic substances in the waste water.

Magnetic Separation

Magnetic separation is a way that removes magnetic metal impurities mixed in oil plants by magnetic force. Taking advantage of magnetic differences of various ores and materials, magnetic separation works under magnetic force or other forces.

According to the intensity of magnetic field, magnetic separations are basically divided into three kinds: low-intensity magnetic separation, which is used to select high-intensity ores; medium-intensity magnetic separation, which is used to select medium-intensity ores; high-intensity magnetic separation, whose structure is related to the magnetic intensity and size of the unselected ores. Apart from magnetic pulley that selects massive materials, the size of materials ranges from a few millimeters to a few micrometers can be treated by these three kinds of technologies.