Mineral separation process for improving brown iron ore grade

Abstract

The invention relates to a method for selecting limonite, which comprises that a, using ball grinder, screw grading machine and high-frequency vibration screen to grind mineral, b, reselecting, roughly selecting, fine selecting, and secondary selecting, c, reversely floating selecting to obtain high-level limonite. The invention utilizes reselection and reverse floating selection, with low cost to be used in the mineral selection industry whose yield is 100000t. And the invention adds a high-frequency vibration screen into traditional ball grinder and screw grading machine to improve the grading efficiency as 30% and adds secondary fine selection to reduce the mud content under 5%, and improve 2-3 degrees of the levels of mineral. And the invention removes mud before reverse floating selection to reduce agent consumption.

Description

【Technical field】 [0001] The invention relates to a method for beneficiating ferrous metals, in particular to a method for beneficiating refractory limonite. 【Background technique】 [0002] Limonite is a hydrous iron oxide ore, which is formed by the weathering of other ores. It is widely distributed in northern Guangdong, but it is rare to find large deposits. Its chemical formula is nFe 2 o 3 mH 2 O (n = 1 to 3, m = 1 to 4). Limonite is actually made of goethite (Fe 2 o 3 ·H 2 O), goethite (2Fe 2 o 3 ·H 2 O) and a mixture of iron oxides and argillaceous substances containing different water of crystallization. Most of the iron-bearing minerals in limonite are 2Fe 2 o 3 ·H 2 O form exists. [0003] Limonite has a large mud content, fine particle size, and is easy to muddy. The main gangue is silicon dioxide, which is easy to collect, and is a weak magnetic mineral. It is basically ineffective to sort with a general magnetic separator. Relying on the current H...

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Problems solved by technology

[0007] At present, the traditional grinding and classification process combining ball mill and spiral classifier is simple, mature and effective in the production process of magnetite and part of hematite, but in the process of grinding and classification of limonite due to Due to the limitation of classification efficiency, it is very easy to produce two situations of over-grinding and insufficient crushing of minerals. It is necessary to cooperate with other classification equipment to form a new grinding and classification process to improve

[0008] 2. Large metal loss in the desliming process

[0010] Desliming after grinding, such as the hydrocyclone desliming process, can remove most of the slime, but it has the same disadvantages compared with the desliming operation of the ore washing machine: the limonite metal particles after muddying are too large in size. Fine, basically discharged from the overflow port with the slime

[0011] 3. Low concentrate grade

[0012] High-gradient magnetic separator has a high recovery capacity for weakly magnetic limonite, but iron-containing silicate minerals are often symbiotic in limonite, and strong magnetic machines will also recover iron-silicon minerals while recycling limonite. Absorbed and recovered together with salt minerals, resulting in low grade iron concentrate

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