Beneficiation method for recovering chrome lump ore

Abstract

The invention discloses a beneficiation method for recovering chrome lump ore. The method comprises the following processing steps: crushing the chrome ore, and classifying three particle size grades including 20-15mm, 15-6mm and 6-2mm by narrow level screening; respectively carrying out dry-type strong magnetic separation on the three classified particle size grades obtained by screening by virtue of a permanent magnet roller type strong magnetic separator; adjusting the speed of a feeding belt of the permanent magnet roller type strong magnetic separator and the distance between the center of a barrel and a separating clapboard to obtain the best grading technical index, wherein the magnetic field intensity of the surface of the belt of the permanent magnet roller type strong magnetic separator is 0.9-1.3T. The method is simple in technological process, the high-quality Cr2O3 ore concentrate can be obtained by screening classification and narrow level screening, and the recovery rate of the Cr2O3 can be increased. The method is short in beneficiation process and is capable of obtaining the ore concentrate and removing tailings in advance; the beneficiation technology has the advantage of being lower in energy consumption compared with other technologies; the method not only can be used for screening the chrome ore, but also can be used for screening other weak magnetic iron minerals such as manganese ore, hematite, goethite, siderite and limonite.

Description

technical field [0001] The invention relates to a mineral processing method for chromium ore, in particular to a mineral processing method for chromium ore lumps with a particle size of 20 to 2 mm, which is especially suitable for the mineral processing and recovery of chromite ore, and can also be used for manganese ore, hematite and 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 spinel [Fe(Cr,A1) 2 o 4 ], etc.; gangue minerals ...

AI Technical Summary

Problems solved by technology

Because the ore and waste rock are only distinguished by naked eyes, it is difficult to sort them accurately, resulting in low concentrate grade or high loss rate;

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