A pre-selection process for high-mud and high-grade composite iron ore

Abstract

The invention discloses a high-mud-content and high-grade composite iron ore preconcentration technology. The technology comprises the steps that high-grade composite raw iron ore with an iron grade of 47.0-55.0% is broken to 40 mm - 0 mm, ore washing is conducted with a screw ore-washer to obtain settled sand and separate out slurry, and the -0.030 mm fraction content in the slurry is controlled to be larger than or equal to 80%; the settled sand obtained through ore washing is sieved to be graded through sieving, the sieving size is 6 mm, dry type strong magnetic preconcentration with a magnetic field intensity of 700 kA / m - 900 kA / m is conducted on the part above a sieve to obtain strong magnetic block ore concentrate, and dry type strong magnetic preconcentration tailings and the part under the sieve are combined into middlings for subsequent ore grinding and grading. According to the technology, the strong magnetic block ore concentrate can be obtained in advance, and strong magnetic block ore concentrate with productivity larger than or equal to 50% and an iron grade larger than or equal to 59.0% can be obtained under the situation that the iron grade of raw ore is 50+ / -2%, and a material foundation is provided for a reasonable furnace charge structure of a blast furnace. The technology has the advantages that the structure is simple, the process is short, energy consumption is low, the mineral processing index is high, and adaptability is high.

Description

technical field [0001] The invention relates to a beneficiation technology of composite iron ore, especially suitable for raw ore with iron grade of 47.0-55.0%, high mud content, Al 2 o 3 The beneficiation of compound iron ore with high content, serious muddy phenomenon, and iron minerals that are symbiotic with limonite, magnetite, hematite and pseudohematite. Background technique [0002] The beneficiation of high-mud iron ore is extremely difficult. For example, the first-stage beneficiation process system of Sijiaying Iron Mine, which was completed and put into production by Tangshan Iron and Steel Co., Ltd. in my country, is difficult to adapt to the surface red ore with low total iron grade and low magnetic iron content and severe mudification. The selected, concentrate iron recovery rate is only about 40%, seriously affecting the normal production. It is even more difficult to beneficiate the compound iron ore in which limonite, magnetite, hematite and false hematite...

AI Technical Summary

Problems solved by technology

However, the above-mentioned beneficiation process is mainly aimed at the beneficiation of low-iron and high-silicon iron ore. Most of them adopt fine grinding, deep separation, and long-process beneficiation process. The process is long, energy-consuming, and beneficiation costs are high. —55.0%, Al 2 o 3 Mineral processing of high-grade composite iron ore with content ≥ 7.0% and iron minerals that are symbiotic with limonite, magnetite, hematite and false hematite, with high mud content and serious mudification

[0004] In addition, for high-grade iron ore with a raw ore iron grade of 47.0-55.0%, conventional multiple grinding and multiple separation processes can be used to obtain high-grade iron ore concentrate powder, but the energy consumption of beneficiation is high and fine Large amount of tailings

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