Magnetic analysis of ore
The purpose of ore magnetic analysis is to determine the magnetic size and content of magnetic minerals in the ore. Magnetic analysis is usually performed during mineral evaluation, ore selectivity studies, and the operation of magnetic testing plants and magnetic separators.
The magnetic analysis of the ore mainly includes the determination of the specific magnetic susceptibility of the mineral and the determination of the magnetic mineral content in the ore.
(1) Determination of the specific mineral ratio of the ore in the ore
The determination of the specific magnetic susceptibility of various minerals is of great significance in the study of magnetic selectivity. For specific measurement techniques, see Chapter 4, Section 7.
After determining the specific magnetic susceptibility of useful minerals and gangue minerals, their sorting effects can be estimated initially. Minerals can be divided into three categories according to their magnetic strength:
(1) Strong magnetic minerals The minerals have a specific magnetic susceptibility of 35 × 10 -6 m 3 /kg. Such minerals belonging to the main magnet ore, titanium magnetite, also iron, pyrrhotite and the like. Such minerals are readily selectable minerals and can be sorted using a weak magnetic field magnetic separator of approximately 0.15T.
(2) Weak magnetic mineral The specific magnetic susceptibility of this mineral is 7.5 to 0.1 × 10 -6 m 3 /kg. Such minerals belong to the most, such as various weakly magnetic iron minerals (hematite, limonite, siderite, chromite, etc.), various minerals manganese (manganite, manganese iodide, rhodochrosite and the like), human most iron and manganese minerals (wolframite, ilmenite, monazite, columbite, tantalite, niobium, manganese ore, etc.) and some rock-forming minerals (chlorite, garnet, biotite, olivine , pyroxene, etc.). Some of these minerals are easier to select, and some are more difficult to select, so the required magnetic field varies widely, about 0.5 to 2.0T.
(3) Non-magnetic minerals The specific magnetic susceptibility of such sputum is less than 1 × 10 -6 m 3 /kg. Existing magnetic separation equipment cannot be efficiently recycled. It belongs to many minerals such as scheelite , cassiterite and natural gold : non-metallic minerals such as coal , graphite , diamond and kaolin ; gangue minerals such as quartz , feldspar and calcite . Such minerals are very magnetic and can be recovered by magnetic separation with the development of magnetic separation technology.
(II) Analysis of magnetic mineral content
The laboratory uses magnetic separation tubes, manual magnetic analyzers, automatic magnetic analyzers, wet strong magnetic analyzers and AC-DC electromagnetic sorters to analyze the magnetic mineral content in the ore to determine the magnetic selectivity index and industrialize the deposit. Evaluation, check the magnetic separation process and the operation of the magnetic separator.
The requirements for the magnetic analysis instrument are: the accuracy of the magnetic separation of the mineral is high; the adjustable range is relatively wide; the loss when handling a small amount of material is not more than 2%.
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