Simple magnetic separation process for Anshan type iron carbonate-containing lean magnetite ore

Abstract

The invention relates to a simple magnetic separation process for Anshan type iron carbonate-containing lean magnetite ore. The process includes ore grinding, grading and magnetic separation and comprises the following concrete steps: ore grinding three times; presorting with a large-wrap angle medium-intensity magnet separator; grading with a cyclone three times; dehydration in three stages; fine sieving in two stages; and magnetic separation with a magnet separator in four stages. The invention provides the energy-saving, low-carbon, environment-friendly and reliable production process for treatment of iron carbonate-containing lean magnetite ore by using a simple magnetic separation method; the process can further improve treating capability, enhance technical and economic indexes, reduce production cost and greatly increase the utilization efficiency of inferior resources while improving ore grinding, grading and sorting efficiency.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to an Anshan-style single magnetic separation process for iron carbonate-containing lean magnetite ore. Background technique [0002] Anshan-type lean magnetite belongs to sedimentary metamorphic deposit, which is a fine-grained disseminated iron ore. The natural type of ore is mainly iron-bearing quartzite, which is composed of quartz (or hornblende) and magnetite (including some false hematite), and its main structure is banded and disseminated. Anshan-type lean magnetite ore belongs to high-silicon, low-sulfur and phosphorus-poor iron ore, with less hematite and limonite content, and its embedded particle size is fine and uneven. [0003] According to the properties of Anshan-type lean magnetite ore, most of the ore concentrators at home and abroad generally adopt the stage grinding-magnetic separation-fine screen regrinding process to complete the ore gri...

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Problems solved by technology

[0006] At present, the separation of Anshan-type lean magnetite ore containing less than 6% iron carbonate generally adopts "stage grinding-single magnetic separation-fine sieve regrinding process", However, with the continuous verification of production practice, this treatment process has also exposed many obvious defects: First, due to the fine particle size of this type of ore and the relatively low content of magnetic minerals, the product particle size of the original grinding process often cannot meet the requirements. The need to realize monomer dissociation resulted in low ore concentrate grades with large fluctuations, and it was difficult to reach the laboratory concentrate grade of more than 65%. Grinding phenomenon, under the condition of low mineral dissociation degree in the grinding product, the content of -10 microns increased significantly, which easily caused the loss of metal in the separation process, especially the loss of magnetic iron in the tailings; the third is the original primary separation The other equipment is an ordinary weak magnetic field magnetic separator with a magnetic field strength below 200mT, but its tailings production rate accounts for more than 80% of the total tailings production rate. It is not suitable for iron carbonate-containing poor magnetite ore, and it is also easy to cause metal loss; the fourth is The tertiary grinding and grading process and process adjustment ability are poor, and the particle size of the grinding product is relatively coarse. The above problems eventually lead to low concentrate grade, high tailings grade, low resource utilization efficiency and high production cost

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