Novel beneficiation technology of high-grade ferrochrome ore

Abstract

The invention discloses a novel beneficiation technology of high-grade ferrochrome ore. The novel beneficiation technology includes the following technological processes that ferrochrome ore is broken and is screened and classified into the ore of +20 mm fraction and the ore of -20 mm fraction. The ore of the +20 mm fraction receives manual back picking or hotching, large waste ore is thrown, and block concentrate is obtained. The narrow grade of the -20 mm fraction is screened and classified into four fractions, namely the 20-15 mm fraction, the 15-6 mm fraction, the 6-2 mm fraction and the 2-0 mm fraction. For the 20-15 mm fraction, the 15-6 mm fraction and the 6-2 mm fraction, a permanent magnet roller type intensity magnetic separator is used for performing dry intense magnetic separation. The 2-0 mm fraction is further screened and classified into the 2-0.8 mm fraction and the 0.8-0 mm fraction. For the 2-0.8 fraction, a shaker is selected again to obtain shaker gravity concentrate, and for the 0.8-0 mm fraction, a spiral chute and the shaker are used and a united procedure is selected again to obtain the thin-particle gravity concentrate. The novel beneficiation technology can be used for obtaining the concentrate and removing tailings in advance and has the advantage of being lower in energy consumption compared with other technologies. The technology can be used for grading chrome ore and can also be used for grading other weak magnetic iron minerals such as manganese ore, goethite, siderite and limonite.

Description

technical field [0001] The present invention relates to chromite ore beneficiation technology, in particular to chromite ore beneficiation process, especially suitable for Cr in chromite ore 2 o 3 Content ≥ 30% or Cr 2 o 3 The beneficiation and recovery of high-grade chromite ore with a content between 30% and 36% can also be used for the separation of manganese ore, hematite, goethite, siderite, limonite and other weak magnetic iron minerals . Background technique [0002] Chromium is the most important element in the stainless steel industry, and chromium ore is an indispensable strategic resource for national economy and national defense cutting-edge technology. In my country, chromium ore is a mineral that is in short supply, and my country's chromium ore reserves are less than 0.01% of the world's. The common chromium spinel minerals in my country's chromite ore are chromite [(Mg, Fe)Cr 2 o 4 ], aluminum chromite [(Mg, Fe) (Cr, A1) 2 o 4 ] and chromium-rich spin...

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Problems solved by technology

This kind of beneficiation process requires high energy consumption due to the need for grinding; according to the test results in this paper, the strong magnetic separation equipment for processing chromite ore with a particle size of 0.1-0.5mm should be an electromagnetic high-gradient strong magnetic separator, which is also a high-energy-consuming machine. equipment

Moreover, the beneficiation process provided in this article can only be realized in the laboratory, and cannot be realized on a large scale in industry, because no matter what kind of grinding equipment is used, it is impossible to accurately "grind all the chromite ore to 0.1~0.5mm, the yield of +0.5mm particle size is only about 0.3%, and the yield of -0.1mm particle size is less than 3%”

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