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(1) The chemical composition and mineral composition are very complicated. In addition to the listed components, there are also higher levels of titanium , antimony, manganese , antimony, bismuth and radioactive elements such as antimony and radium. Rare earth oxides represented by R x O y dozen components include lanthanum, cerium, praseodymium, neodymium, samarium, europium. Compared with ordinary iron concentrates, in addition to the complex chemical composition, the fluorine-containing iron concentrate has the characteristics of low iron grade and low silica content, and high calcium and magnesium content. Numerous chemical components contribute to the complexity of the fluorinated iron concentrate and make the sintering reaction very complicated. The composition of the fluorine-containing iron concentrate and the common iron concentrate mineral composition shows that the mineral composition of the fluorine-containing iron concentrate is very complicated. In addition to the list, there are many minerals containing rare earths, strontium, barium and radioactive elements. One characteristic is that silica is a special girl, most of which is not quartz , but exists in the form of complex silicates, which is very unfavorable for the sintering reaction.
(2) There are many types of harmful elements and high content. In addition to the high sulfur and phosphorus content of fluorine-containing iron concentrates, the most special ones contain a large amount of fluorine, and the potassium and sodium contents are much higher than ordinary iron ore. Presence of fluorine melt characteristics significantly affect the sintering process, the strength and metallurgical properties of the sintered ore, is the root of a fluorine-containing sinter particularity. The presence of fluorine also creates a special environmental problem that adds to the difficulty of sintering production. The high content of potassium and sodium is another characteristic of iron ore. They are found in iron-containing silicates, and the ore separation process is difficult to separate. Potassium and sodium have similar effects on the sintering of fluorine, which affects both the melt properties and the strength of the sintered cemented phase. The biggest effect of potassium and sodium is the circulation enrichment in the blast furnace, which destroys the blast furnace.
(3) The mineral mosaic structure is complicated and the separation of iron minerals is difficult. Because the Baiyun Obo iron ore has many kinds of iron minerals, many minerals are inlaid and connected, which brings difficulties to mineral processing. Taking the main iron ore-bearing magnetite as an example, when the grinding fineness reaches 0.075 mm and accounts for 90%, the dissociation degree of the iron mineral monomer is only 84.7%. Therefore, the fluorine-containing iron concentrate has a fine particle size, generally 0.075 mm. Both are above 85%, and fluorine-containing sintering is a typical fine concentrate sintering.
(4) The iron concentrate has a wide melting interval. Due to the complex mineral composition of the fluorine-containing iron ore, the melting points of various minerals are large, and the melting interval is wide. The melting interval is an important property affecting the sintering process. The wider melting interval increases the gas permeability resistance and fuel consumption of the sintering zone. 
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Characteristics of fluorine-containing iron ore and its effect on sintering
Baiyunebo ore is an iron, rare earth, niobium and other deposits intergrowth. Due to the complex nature of the deposit, different mineral combinations are formed in different parts. It has been found that the ore body contains 71 elements and more than 170 minerals. Since many minerals have never been seen in ordinary iron ore, and the mineral combinations of different types of ore belts are quite different, this brings a lot of specialities to the mining, selection, burning, smelting, comprehensive utilization and environmental protection of iron ore. . From the perspective of steel production, fluorine-containing iron concentrates have the following four characteristics.