subject: Weakly Magnetic Iron Minerals In A Weak Magnetic Roasting And Magnetic Separation [print this page] (A) Introduction Magnet baking (A) Introduction Magnet baking
Hematite, phosphate mining process, siderite, pyrite and other minerals, magnetic low, with a weak magnetic separation can not be recycled, but you can use magnetic roasting method to turn them into strong magnetic iron minerals (magnetite or -hematite), and then recovered using low intensity magnetic separation methods.
Magnetic roasting the ore is heated to a certain temperature in the appropriate atmosphere for physical and chemical reactions. According to the different minerals, different chemical reaction. Principle can be divided according to their magnetic roasting reduction roasting, baking and roasting so neutral.
1, the reduction roasting - for hematite and limonite. Commonly used reducing agent are C, CO and H2 ratio.
Limonite in the heating process of the first compound of water discharged into the water does not contain hematite and magnetite are reduced.
2, sand maker neutral roasting - for siderite. Siderite in the barrier into the air or through a small amount of air conditions, heated to 300 ~ 400 , they were broken down into magnetite.
3, roasting - for pyrite. Oxidation of pyrite in the atmosphere (or access to a large number of air) into a short time roasting pyrrhotite is oxidized, if oxidation time is long, pyrrhotite into magnetite.
In addition to the three firing methods, there are roasting and reduction oxidation and reduction oxidation roasting, but the main thing is to restore roasting.
Calcination of raw materials and reduction in the heating process with the reducing agent can be divided into gas, liquid and solid three. The most commonly used industrial gas, heavy oil and coal.
(B) the calcined product of magnetic
Anshan-type hematite iron ore resources in China, also occupy an important place. Mineral composition of the ore is relatively simple, the main iron mineral hematite illusion, hematite, magnetite, followed by specularite, pyrite and a small amount of limonite, goethite, siderite and ankerite and so on. Gangue minerals are mainly quartz, followed by tremolite, hornblende, actinolite, sericite, chlorite and calcite.
Jingtieshan type of iron ore in the iron ore resources also occupy a certain position. The main iron ore minerals in the mirror, limonite and siderite. Main gangue minerals are barite, quartz, jasper and iron dolomite. Ore with banded and massive two structures to the main banded. Particle size distribution of iron minerals embedded small granular or scale-like, while there is little in the hardness of minerals such as barite, siderite, etc., so not very difficult to break or dissociation.
The bulk of these two types of ore roaster in some of the general into the magnetic magnetization, magnetic products with low intensity magnetic separation methods, fine ore with strong magnetic separation or flotation methods.
Fourth, the weak intensity magnetic separation of magnetic iron minerals
As new machines continue the successful development of high intensity magnetic separation, magnetic separation method makes use of large-scale treatment alone weakly magnetic minerals, especially iron oxide is possible. However, in some cases, magnetic beneficiation methods combined with the other needed to achieve the purpose of sorting and requirements.
cone crusher design Concentrator is often used two continuous grinding, magnetic separation process weakening a strong handle 0 ~ 10mm ore powder.
After a period of fine ore, Sec grinding and classification, with a cylindrical sieve off the residue, the election of a strong magnetic separator magnetic minerals, tailings magnetic separator and then to conduct a roughing, two scavenging.
