SU1622011A1 - Method of wet grinding of ores in closed cycle with classification - Google Patents

Description

one

(21) 4492712/33

(22) 10.10.88

(46) 01.23.91. Bul Number 3

(71) Institute of Geotechnical Mechanics, Academy of Sciences of Ukraine

(72) V.N. Poturaev, A.M. Turkenich and E.S. Lapshin

(53) 621.926.9 (088.8)

(56) Ostapenko P.E. Theory and practice of iron ore enrichment. - M .: Nedrz, 1985, p. 270

Evsovich S.G., Zhuravlev S.I. Enrichment of magnetite ores. - M .: Nedra, 1972, p. 390.

(54) METHOD FOR WET CRUSHING OF ORE IN A CLOSED CYCLE WITH CLASSIFICATION

(57) The invention relates to mineral processing and can be used, for example, in the first stage of grinding and the classification of iron ores. The purpose of the invention is to increase the efficiency of the grinding process by reducing operating costs. The original ore is fed into the feed neck of the mill. The unloading of the mill is subject to size classification for the fine finished product and the lumpy intermediate. The intermediate product of grinding with the help of a jet pump is introduced into the pipeline, through which water flows, pumped by a centrifugal pump. The mixture of water and the intermediate product flowing from the pipeline is concentrated and then loaded into the mill. 1 il.

The invention relates to the ore-dressing industry, in particular to the enrichment of strong and abrasive ores, and can be used, for example, in the first stage of grinding and classification of ferruginous quartzites.

The aim of the invention is to increase the efficiency of the grinding process by reducing the operating costs,

Due to the fact that, according to the method h, the water is injected and then the intermediate product is added to this water, which is already moving through the pipeline, and the pump that performs the injection operation works outside the abrasive medium, which increases its reliability.

The drawing shows an apparatus circuit diagram implementing the proposed grinding method.

Example 1. Iron ore with a particle size of 25-0 mm is subjected to grinding in a ball mill 1 operating in a closed loop with a vibrating screen 2. The sub-screen product of the screen together with the water flowing from the mill is removed from the grinding circuit. Production mills for the original ore 100 t / h. The minimum circulation of the material (1) in the first grinding stage is 150%, therefore, in this example, it is 150 tons / h. The minimum solid content in the discharge of the mill is 80% (2).

A centrifugal pump 3 water is injected into the pipeline 4. A screening grab (intermediate grinding product) is introduced into the pipeline through a hydro-jet pump 5. Such a pump does not create pressure head as it works

due to the water injected into it, and therefore has no moving parts, is simple and reliable in operation.

The mixture of undescended product flowing out of the pipeline and water enters the thickener b, from where, after condensation, it is sent to the feed mouth of the mill. The water released during the thickening of the mixture is returned to the centrifugal pump through line 7.

For a stable transfer of the oversize product from the screen to the jet pump and subsequent entry into the pipeline, water must be added to the oversize product. However, in this example, we will assume that these operations are performed without the addition of water, i.e., a dry load of the oversize product is carried out in the jet pump. Accepting this condition will make it possible to show that even the water that is needed to transfer the intermediate product from the discharge to the feed neck of the mill cannot be fully loaded into the mill.

By the method according to the invention it is possible to grind any materials. The use of the method is most effective in the first stage of grinding abrasive ores, for example ferrous and non-ferrous metals.

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The use of the method of wet grinding of ores in a closed loop with classification provides, in comparison with existing methods, a reduction in the cost of repair and replacement of centrifugal pumps, which have low reliability when pumping abrasive intermediate grinding products.

Claims (1)

The invention of the method of wet grinding of ores in a closed cycle with classification, including the supply of the original ore to the feed mouth of the mill, the discharge of the grinding product through the discharge neck of the mill, the classification of the grinding product by small finished product and large intermediate, the mixture of intermediate product and water in the pressure the pipeline and its feeding into the mill mouth of the mill, characterized in that, in order to increase the efficiency of the grinding process by reducing the current Atrato first injected into the penstock water, then it is introduced into the intermediate product and arising from the flow conduit of the intermediate product mixture and water is evaporated before feeding her e boot neck mill. / Zl