method of magnetic separation of ore

magnetic separation of manganese ore - fodamon machinery

magnetic separation of manganese ore - fodamon machinery

Manganese resources in the world are mainly distributed in South Africa, the former Soviet Union, Australia, China and other countries. Apart from China, the worlds land manganese ore reserves are about 17.292 billion tons.

There are many classification methods of manganese ore, which can be divided into sedimentary type, metamorphic type and weathering type according to the genesis of the deposit; manganese ore and iron manganese ore according to the iron and manganese content of the ore. According to industrial use, it can be divided into metallurgical manganese ore and chemical manganese ore. In addition, according to the natural types and associated elements of minerals, they are divided into manganese carbonate ore, manganese oxide ore, mixed ore and polymetallic manganese ore.

Manganese carbonate ore exists in various forms of manganese carbonate minerals, and its content accounts for more than 85% of the manganese content in the ore. Manganese oxide ore exists in various forms of manganese oxide minerals, and its content accounts for more than 85% of the manganese content in the ore. The manganese present in the form of various manganese carbonate minerals or manganese oxide in the mixed manganese ore accounts for less than 85% of the manganese content in the ore.

Polymetallic manganese ore is different from the above three kinds of manganese ore, in addition to manganese, it also contains other metal and nonmetal minerals. There are many manganese carbonate mines in China, accounting for about 57% of the total manganese ore. At present, manganese ore beneficiation methods include gravity separation, heavy medium-strong magnetic separation, roasting-strong magnetic separation, single strong magnetic separation, flotation, and a combination of multiple methods.

Manganese minerals are weak magnetic minerals. The strong magnetic separation of manganese ore occupies an important position. A single magnetic separation process for manganese carbonate ore and manganese oxide ore with a relatively simple composition and coarse-grained particle size can obtain better separation indexes. When sorting manganese carbonate ore, the magnetic field strength of the magnetic separator must be above 480 kA / m, while the magnetic field strength of the magnetic separator for sorting manganese oxide ore is higher, generally above 960kA / m.

Magnetic separation of manganese oxide ore. Most of the manganese oxide ore belongs to the secondary ore of the weathering leaching deposit. It has a soft texture and contains more clay minerals. It is very easy to be muddled in the process of ore and transportation. The manganese-containing grade and improvement ofcrushing, screening,beneficiationand transportation conditions all need to be washed. Coarse particles (about 5 mm or more) are sorted by re-selection methods such as jig, and fine particles (about 5 mm or less) can be separated by strong magnetic separation.

Case 1, Miaoqian mining area of Liancheng Manganese Mine in Fujian Province is a weathering crust type manganese oxide deposit, which is divided into leaching type, Deluvial type and mixed type of leaching and Deluvial, mainly leaching type. The main metal minerals in the ore are hard manganese ore, pyrolusite, manganese soil and limonite, etc., gangue minerals are mainly quartz, followed by sericite, opal, barite, and other impurities are mainly loess, clay, etc.

The ore process includes ore washing, jigging and strong magnetic separation. After crushing to less than 70 mm, the ore shall be washed, sieved and graded first, + 30 mm shall be manually separated, 4.5-30 mm ore shall be re separated by am-30 jig, and 4.5 mm particles shall be separated by qc-200 induction roller type high magnetic field magnetic separator. 35.68% of the products were selected with strong magnetic field, 41.23% of the concentrate grade and 93.6% of the recovery.

Magnetic separation of manganese carbonate ore. Manganese carbonate deposit, which belongs to marine sedimentary type, has large reserves and scale, and is an important resource for producing commercial manganese ore.

Case 1, The strong magnetic separation plant of Taojiang Manganese Mine in Hunan Province deals with Rhodochrosite and manganese calcite. After fine crushing, grinding and grading, 0.5-4 mm ore enters into cgde-210 strong magnetic separator for separation, 0-0.5 mm ore enters into SHP strong magnetic separator for separation, and the resulting concentrate is combined and sintered.

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separation process of iron ore,iron ore magnetic separation machine,iron ore beneficiation design | prominer (shanghai) mining technology co.,ltd

separation process of iron ore,iron ore magnetic separation machine,iron ore beneficiation design | prominer (shanghai) mining technology co.,ltd

At present, there are about 300 kinds of iron-bearing minerals found in nature. According to their chemical composition, iron ore can be divided into magnetite, hematite, limonite and siderite; The specific magnetic susceptibility of the material is different, and iron ore is divided into strong magnetic and weak magnetic minerals, which also provides a basis for the selection. The beneficiation process of iron ore of different nature is also completely different.

Multimetal-containing magnetite gangue minerals often contain silicate and carbonate minerals, cobalt pyrite, chalcopyrite or apatite, etc. It is recommended to use a combined weak magnetic separation-flotation process, that is, use weak magnetic separation The process first recovers iron, and then uses the flotation process to recover sulfide or apatite, which is conducive to obtaining higher beneficiation indexes.

Generally, the combined process of weak magnetic separation and flotation is also divided into two types: weak magnetic separation-flotation and flotation-weak magnetic separation. The difference between these two processes lies in the destination of the conjoined magnetite and sulfide.

This shows that under the same grinding particle size, the combined process of flotation and magnetic separation can obtain iron concentrates with low sulfide content and sulfide concentrates with high recovery rate.

Single weakly magnetic iron ore mainly includes hematite, siderite, limonite, and hematite (spiegelite)-siderite ore. Due to the variety of minerals involved in this kind of minerals and a wide range of particle sizes, the beneficiation method will be more complicated, often using gravity separation, flotation, strong magnetic separation or their combined processes.

The flotation process is mainly used for the separation of fine-grained and particulate weakly magnetic iron ore, including two process flows of positive flotation and reverse flotation. Among them, the positive flotation process is suitable for quartz hematite ore without easy pumice gangue, and the reverse flotation process is suitable for ore with easy flotation gangue.

However, due to the low grade of strong magnetic separation concentrates of most weak magnetic iron ore, and the low processing capacity of the gravity separation process unit, the combined process of strong magnetic separation and gravity separation is often used, that is, the strong magnetic separation process is first used to discard a large amount of waste. Qualified tailings, and then use the gravity separation process to further process the strong magnetic concentrate to improve the grade of the concentrate.

Polymetallic weakly magnetic iron ore refers to phosphorus-containing hematite and siderite ore. Most concentrators will first use gravity separation, flotation, strong magnetic separation or a combined process to recover iron minerals, and then use the flotation process to recover phosphorus or sulfide.

It is not difficult to see that due to the large variety and complex nature, most iron ore will use multiple combined beneficiation processes to obtain ideal beneficiation indicators. It is recommended that mine owners must do a good job of beneficiation tests, and rationally choose the appropriate iron ore beneficiation process based on the final report results.

Prominer has been devoted to mineral processing industry for decades and specializes in mineral upgrading and deep processing. With expertise in the fields of mineral project development, mining, test study, engineering, technological processing.

dry magnetic separation of iron ore of the bakchar deposit - sciencedirect

dry magnetic separation of iron ore of the bakchar deposit - sciencedirect

Currently, the development of iron ore of the Bakchar deposit (Tomsk region) is considered promising because of the extremely large reserves of iron ore. Ores of this deposit are related to the high-grade type and expected to have a magnetic concentration for iron extraction. The main task of magnetic separation is to increase the total iron content in concentrates to a value which allows its further metallurgical processing. Ferruginous ore particles have a rounded shape that facilitates a separation process. The paper considers the influence of technological parameters on the magnetic concentrate yield and recovery rate of iron-containing fractions.

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