Magnetic quartzite ore magnetic separation

Quartzite sedimentary ore magnet belonging metamorphic deposits, widely used at home and abroad magnetic sorting method of this type of ore, the ore type referred to in Anshan of lean magnetite, taconite referred abroad, magnet quartz rocks, minerals plays an important role in this type of iron ore resources, is the main target magnetic separation.
The magnetite quartzite beneficiation process is characterized by a stage magnetic separation stage grinding process, which can discharge monomer gangue at a stage and reduce the amount of grinding in the next stage.
The magnetic separation equipment mostly adopts a cylindrical magnetic separator, and the bottom groove is a reverse flow type and a semi-reverse flow type. There are also examples of dewatering using magnetic dewatering tanks at home and abroad.
The following is an introduction to the Dashihe Iron Ore Concentrator of Capital Iron and Steel Company.
The Dashihe Iron Ore Dressing Plant is the main raw material base of the Capital Iron and Steel Company and is located in Qian'an County, Hebei Province. The Dashihe iron ore belongs to the Anshan-type lean magnetite, and the rock strata that constitute each ore body belong to the pre-Sinian gneiss and have a strip-like and patch-like structure. Various types of stone are widely developed between the ore bodies and within the ore body. About 15% of the waste rock is mixed in the mining process, the ore is depleted seriously, the geological grade is 30.18%, and the ore grade is only about 25%.
Metal ore minerals are magnetite, followed by a small amount of hematite and martite; gangue minerals quartz, followed by the pyroxene, hornblende, less harmful impurities.
The symbiotic form of magnetite and gangue is simple and easy to dissociate. The magnetite inlay has a coarse and uniform particle size. The crystal grains having a crystal grain size of 0.062 to 0.5 mm account for 60% to 70%, 0.5 to 2 mm for 10% to 20%, and the content of 0.062 mm or less accounts for about 10%. Hematite has a finer particle size. The granitic mineral crystal grain size is also relatively coarse, ranging from 0.18 to 0.35 mm. When the ore is ground to -200 mesh and accounts for 75% to 80%, the useful minerals and gangues basically reach the monomer dissociation.
The results of multiple analysis of ore chemistry are shown in the table.

The process uses a stage grinding-weak magnetic separation process, as shown in the figure below. First, the ball mill is pre-selected with a magnetic pulley. Before the grinding, the waste rock with a yield of 8% and a grade of about 9% can be discarded, so that the grade of the milled product can be increased by 2%, and the magnetic iron recovery rate is 99%. The second stage of the first-stage magnetic separation concentrate is subjected to secondary classification, secondary grinding, and secondary magnetic separation. After fine screening, the sieve is returned to the second-stage ball mill. The particle size of the three-stage magnetic separation is strictly controlled and improved. The monomer dissociation degree of minerals can increase the final grade of concentrate from 64% to 65% to 67% to 68.5%. The main technical indicators of the process are: 26.28% of the original ore grade, 68.42% of the concentrate grade, 6.41% of the tailings grade, and the recovery rate of 82.64%.

Dashihe Iron Ore Concentrator Production Process

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