SU1450857A1 - Method of controlling the line of multistage separation of ore - Google Patents

Abstract

This invention relates to mining penetration and can be used in mineral processing plants. The purpose of the invention is to increase productivity. The way I controlled. Neither the line of the multistage section- ore containing magnetic minerals includes maintaining the optimal filling of the first grinding mills with ore by varying the ore feed depending on the measured intensity of the reflected and attenuated radiation fluxes supplied to the inside of the mill drums of the classifiers after the first grinding stage and hydrocyclones after the second grinding stage. Constant lengths are cut off from the Peskovian products, the proportion of Peskovian products of classifiers is sent to the power supply of the mills of the second grinding stage, and the share of hydrocyclones to the power supply of the mills of the first grinding stage. The capacity of the line for the original ore is 226.7 t / Cho and the concentrate is 84.34 t / h. 1 tab. t il.

Description

The invention relates to the beneficiation of minerals, in particular, to methods for controlling the lines of the multi-stage separation of ores containing magnetic minerals, and can be used in mining industry in iron ore dressing plants.

The purpose of the invention is to increase pro- ductivity.

The method of controlling the line of multi-stage separation of ore containing magnetic minerals includes maintaining the optimal filling of the first grinding stage with ore by feeding inside these ioB drums, radiation, monitoring the reflected and attenuated radiation fluxes and changing the flow rate these ore mills according to the measured intensity of the reflected and attenuated fluxes | of radiation, the regulation of the densities of the U1Iv classifiers and hydrocyclones that classify the | load The mills, respectively, the first | Boy and the second grinding stages, with a constant cut off share of dog classifier class are sent to the power of the second stage mills, and the cut off share of the hydrocyclone sands is fed to the first stage grinding mill.

At the same time, the controlled line of multi-stage separation of ore containing magnetic minerals becomes self-regulating, in which, when the mineral composition and physicomechanical properties change, the ore being processed and stabilization of the optimal grinding stage of the first grinding stage simultaneously increases the stability of the ore. maintaining optimal filling with ore of the mills of the second grinding stage and, consequently, increasing the productivity of the controlled line in and similar ore. Improving the stability of maintaining optimal filling with ore of mills of the second grinding stage during the exchange between the mills of the first and second grinding stages with the cut portions of the Peskov products of classifiers and the hydrocyclone provides a positive result.

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A508572

In the drawing, a schematic diagram of a controllable 1 line of a multi-stage separation of ore containing magnetic minerals is presented.

The method of controlling the line of multistage separation of ore containing magnetic minerals is carried out in the following way.

The original ore 1 from the hopper 2 is fed by the feeder 3 to the mill 4 of the first grinding stage. The unloading of the mill 4 enters the classifier 5 and undergoes classification, dividing the fine-grained plum 6 and the coarse-grained sandy product 7. By means of the divider 8, its fraction 9 is cut off, then sent to the mill 10 of the second grinding stage . Another 11 of the sand product 7 is returned as a circulating load to the mill 4 of the first grinding stage. Inside

The bar of the aban mill 4 is supplied by source 12 and the intensities of the reflected and attenuated radiation fluxes are monitored respectively by meters 13 and 14. The measured intensity of these radiation streams varies the flow rate of the original ore 1 supplied by the feeder 3 to the mill 4 of the first grinding stage. The discharge density 6 1 of the classifier 5 is regulated by means of the regulator 15. The drain 16 of the required density is subjected to magnetic separation on the magnetic separator 17 on the non-magnetic 18 and magnetic 19 products. The magnetic product 19 enters the mill 10 of the second grinding stage, the unloading 20 of which from the pump 21 by the pump 22 is fed to the hydro cyclone 23. When this hydrocyclone is classified, the unloading 20 of the mill 10 is divided into Leskovoe product 24 and the fine-grained discharge 25, the density of which is regulated by means of the regulator 26. Next, the drain 25 is subjected to desliming in the magnetic separator 27 and separated into the drain 28 and sand 29. The sand 29 is directed to the magnetic separator 30 and separated into non-magnetic 31 and magnetic 32 products. The sand product 24 of the cyclone cyclone 23 enters the divider 33, by means of which the constant share 34 is cut off from this sand product and directed to.

the millinas 4 of the first grinding stage, and the other 35 of the sandy product 24, as a circulating load, returns to the mill 10 of the second grinding stage. If the content of magnetic minerals in the original ore decreases, the mass flow rate of the magnetic product 19 directed to the mill 10 of the second grinding stage will correspondingly decrease, and, consequently, the mass flow rate of the cut-off fraction 34 from the sandy product 24 of the hydrocyclone 23 will decrease. a fraction of the 34 sands of a hydrocyclone will reduce the mass flow rate of the total product 36 entering the mill. 4 of the first grinding stage. This changes the intensity of the reflected and attenuated radiation fluxes monitored by gauges 13 and 14, and the flow rate of the original ore 1 supplied by the feeder 3 to the mill 4 of the first grinding stage will increase to the value at which intramillary filling of the ore mill 4 will again reach its optimum value . Due to an increase in the productivity of the line in the original ore 1, the mass flow rate of the fraction 9 of the sandy product 7, sent to the mill I) of the second grinding stage, and the intramill size, filling the mill with ore will also increase to the optimum value. Similarly, the optimal intramill filling with the ore of the mills of the first and second grinding stages is maintained with fluctuations in the physicomechanical properties of the ore being processed and, consequently, an increase in productivity is achieved in the original ore of the multi-stage ore line containing magnetic minerals.

And p and meer. Magneti-hematite crushed ore is fed to the production line, which includes three stages of grinding and five stages of wet magnetic separation, as well as three methods of de-sludge and the operation of filtering iron ore concentrate. Due to the variation in the mineral composition, the iron content of the total ore in the initial ore varied in the range from 38 to 42%.

The prototype line output of the original ore was 220 t / h, and the concentrate - 81.8 t / h. When managing the line by the proposed method, in which classifiers and hydrocyclones that classify the unloading of the mills of the first and second grinding stages, respectively, are removed from the Sand products by 15% of the mass consumption of these sandstones, the output of the line for the original ore increased to 226.7 tons / h, and in concentrate - up to 84.34 t / h, fuel up 3%.

The results are shown in the table.

The use of the described method of controlling the line of multi-stage separation of ore containing magnetic minerals ensures a higher productivity of the original ore by increasing the stability of maintaining optimal filling of the second grinding stage with ores of the mineral composition and physical and mechanical properties of the ore being processed; the achievement of stability of maintaining optimal filling of the second stage of grinding with ore mills without using additional control and regulation equipment.

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Formula inventions

A method of controlling a multi-stage separation line of ore containing magnetic minerals, including maintaining optimal filling of the first grinding stage with ore by changing the ore feed depending on the measured intensity of the reflected and attenuated radiation flux supplied to the inside of the mill drums, and controlling the densities of classifiers after the first grinding stage and hydrocyclone after the second grinding stage i characterized by the fact that, in order to increase productivity, the compartment Constant proportions from the Peskov products are obtained, the Pesky products of the classifiers are sent to the power of the mills of the second grinding stage, and the share of hydrocyclones to the mills of the first grinding stage.

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Claims (1)

Claim A method for controlling a multi-stage separation line of ore containing magnetic minerals, comprising maintaining the optimal filling of the mills of the first grinding stage by ore by changing the ore supply depending on the measured intensity of the reflected and attenuated radiation fluxes supplied inside the mill drums, and adjusting the density of the classifiers after the first grinding stage and hydrocyclone after the second grinding stage; characterized in that, in order to increase productivity, constant fractions of sand products are cut off, with the share of classifier sand products being fed to the mills of the second grinding stage, and the fraction of hydrocyclones to the feed of mills of the first grinding stage. 5 1450857 Indicators - Method Prototype | Proposed Productivity of the multi-stage separation line for the source ore, t / h 220 226.7 Ore characteristic, type Magnetite hematite Magnetite hematite Iron content, X: magnetic 24-28 ' 24-28 of common 38-42 . 38-42 The content of the class is 0.05 + 0 mm in the grinding product, X, at the stage of:. I 46 46 II 82 82 X III 95 95 The iron content in the concentrate, X 63.8 63.8 The yield of concentrate, Z ₍ 37,2 37,2 The proportion of the cut-off part of the sand operation calibration verification, X, in the grinding stage: I fifteen II Concentrate output, t / h 81.84 84.34 i I 17 12. I # The intermediate product τ— 19 per * ί. L3] sG ^ ^ 32 tails