SU1556736A1 - Method of selective disintegrating ore - Google Patents

Abstract

The invention relates to the enrichment of minerals and other materials consisting of components of different strength, and can be used in the mining, chemical, potash, energy and other industries, in the production of building materials, the agro-industrial complex. The aim of the invention is to increase productivity, intensify the enrichment process and improve the quality of the final products. The method of selective grinding of ore includes feeding it into the grinding circuit, impacting impact and abrasive loads and removing crushed products, the ore being fed periodically, and grinding from the moment the ore is fed until the grinding circuit is filled to an unsteady condition with accumulation of difficult-to-process components in the circulating product , then the supply of ore is stopped and the circulating product is crushed in the discharge mode with its subsequent removal from the grinding circuit. 2 tab., 1 Il.

Description

The invention relates to the enrichment of minerals and other materials consisting of components of different strength, and can be used in the mining, chemical, potash, energy and other industries, as well as in the production of building materials and the agro-industrial complex.

The purpose of the invention is to increase productivity, intensify the enrichment process and improve the quality of the final grinding products.

The essence of the method is that the ore is fed into the grinding circuit periodically, and grinding from the time of delivery to the maximum filling of the grinding circuit is carried out in an unsteady mode with the accumulation of difficult-to-cut components in the circulating product, then the ore feed is stopped and the circulating product is crushed in the discharge mode its subsequent removal from the circuit

The drawing shows an installation diagram for carrying out the proposed method.

The installation contains a ventilated circuit containing a single closed pipeline system in which the circulation of the venting agent is provided by fan 1 through pipelines 2 of mill 3, transport pipelines 4, classifier in the form of an air-through separator 5, collecting pipeline 6 and catching cyclone 7

The ventilated circuit includes two pre-grinding circuits, each of which contains a mill 3 (or one section of the mill), a transport pipeline 4, an air-through separator 5, return pipes 8 and 9, a switch 10 with a drive and a discharge pipeline 11.

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The feed mill feed ore and drying agent is carried out periodically using the device 12 through pipelines 13.

The method is carried out as follows.

The original ore is fed to the feeding device 12 together with the drying agent in one of the mills 3, where it is crushed and dried at a given flow rate of the venting agent. Under the action of aerodynamic forces generated by the ventilating agent, the crushed ore is removed from the mill 3 and through the pipe-line 4 enters the separator 5, where the separation of small particles transported through the pipeline b to the cycle- takes place. Tray 7, in which they are captured, and large particles are returned via pipelines 8 and 9 to mill 3 for grinding.

The grinding circuit provides a multiply increasing circulation of coarse particles from the moment the original ore is fed until it is completely filled with ore, after which the ore and drying agent supply from this section is turned off and the latter are sent to another section. Over the entire period of accumulation of the product in the grinding circuit, due to the different grindability of the components, the circulating product saturates with difficult to grind components and at the same time enrich the finished small product with easily grinded components. From the moment the ore feed is shut off, the grinding circuit is unloaded due to the regrinding of intergrowths in the circulating product and the entrainment of the finished small product. At the same time, the enrichment process of the circulating product is significantly intensified, and the enrichment efficiency of the finished product remains at the same level or slightly decreases. At the time of completion of the process, the grinding of intergrowths and the achievement of a certain ratio between the difficult to grind and easily grindable components in the circulating product

milling contour from difficult to grind components.

Thus, the periodic supply of ore to the grinding circuit, its marginal filling in unsteady mode of 5 grinding and stopping the supply of ore with the subsequent unloading of the grinding circuit during grinding of the circulating product and dumping difficult to grind components, increase the enrichment process and improve the quality of final products grinding.

Example. Silvinit ore from the Starobinskoe deposit was selected for the experiment.

-with a particle size of 40-5 mm, containing three components: potassium chloride (KCI), having a particle size of 1 mm, sodium chloride (NaCI), with a particle size of 5 mm, and clay-carbonate rock (insoluble residue or abbreviated as id) The 20 has a fineness of 10 mm. Contains Composition of the components in the original ore, respectively, was%: КС1 22.7; NaCl 68.5; and about. 8.8. The goal was to selectively grind the ore to a particle size of 1-0 mm,

 at the same time, to obtain a finished product with a higher content of easily crushed component KS1 than in the original ore and isolate from the grinding circuit a circulating product with a size of 10-1 mm, enriched with a difficult to grind component and no less than 40% of i.o. For installation in one section of a two-section hammer-type ventilating MMT mill, 200 mm in diameter and 100 mm long, the original ore was fed in the amount of 1.5 kg / min.

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In unsteady grinding mode, the circulating product accumulated in the grinding circuit to the maximum filling of the circuit in the seventeenth minute in an amount of 9.6 kg.

At the same time, the circulating product had the following material composition,%: 15.8, KCI 18.7 (enriched in acting), and the finished product had the following material composition,%: n.o. 4.2; KCt 25.1 (processes switch 10 (grinding 45 is boosted by CS). At this moment the feed

the product is opened) and the enriched product is removed through line 11 until the grinding circuit is completely released, after which the switch 10 returns to its original position (the grinding circuit is closed) and the cycle is repeated.

Thus, both grinding circuits work periodically, if ore is supplied to one of them and it is loaded, the circulating product accumulates, the second is unloaded at the same time, before the melt splices in the circulating product, and free of enriched product. Equal to the sum of the time of grinding and discharging of the heel was discontinued and the circulating product was subjected to grinding in the mode of discharge of the grinding circuit for sixteen minutes.

At the thirty-third - thirty-fourth minutes from the start of the ore supply, using the switch 9, the product with a particle size of 10-1 mm in an amount of 1.7 kg with the content,% bp, was isolated from the grinding circuit. 47.6 and KCI 9.8 (enriched in i.e.), while in the process of unloading the grinding contour the finished product with a size of 1-0 mm contained an average of 4.3%. and 24.6% CS (enriched for CS1). The second grinding circuit worked

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milling contour from difficult to grind components.

Thus, the periodic supply of ore to the grinding circuit, its limiting filling in unsteady grinding mode and stopping the supply of ore with the subsequent unloading of the grinding circuit during grinding of the circulating product and dumping difficult to grind components, improve the quality of the final grinding products.

Example. Silvinit ore from the Starobinskoe deposit was selected for the experiment.

with a particle size of 40-5 mm, containing three components: potassium chloride (KCI), having a particle size of 1 mm, sodium chloride (NaCI), with a particle size of 5 mm, and clay-carbonate rock (insoluble residue or abbreviated as id), have 0 The opening size is 10 mm. Contains Composition of the components in the original ore, respectively, was%: КС1 22.7; NaCl 68.5; and about. 8.8. The goal was to selectively grind the ore to a particle size of 1-0 mm,

 at the same time, to obtain a finished product with a higher content of easily milled component KS1 than in the original ore and to isolate from the grinding circuit a circulating product with a size of 10-1 mm, enriched with a difficult to grind component, not less than 40% of I.O. For installation in one section of a two-section hammer-type ventilating MMT mill, 200 mm in diameter and 100 mm long, the original ore was fed in the amount of 1.5 kg / min.

In unsteady grinding mode, the circulating product accumulated in the grinding circuit to the maximum filling of the circuit in the seventeenth minute in an amount of 9.6 kg.

At the same time, the circulating product had the following material composition,%: 15.8, KCI 18.7 (enriched in acting), and the finished product had the following material composition,%: n.o. 4.2; KCt 25.1 (enriched by the COP). At this point, the filing

the ore was discontinued and the circulating product underwent regrinding in the discharge mode of the grinding circuit for sixteen minutes.

At the thirty-third — thirty-fourth minutes from the start of the ore supply, using the switch 9, a product of 10–1 mm in the amount of 1.7 kg with the content,% bp, was isolated from the grinding circuit. 47.6 and KCI 9.8 (enriched in i.e.), while in the process of unloading the grinding contour the finished product with a size of 1-0 mm contained an average of 4.3%. and 24.6% CS (enriched for CS1). The second grinding circuit worked

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similar to the first, starting from the moment the original ore was fed into it at the seventeenth minute.

In tab. 1 shows the results of grinding, sylvinite ore in a mill operating in a closed cycle with a separator (grinding circuit without powering down, ventilation - 450 m3 / 4, content of components in the original ore,%: NaCl 54.5; KC1 31.8; acting 13.7.

In tab. Table 2 shows the results of the reduction of sylvinite ore with the circuit power supply switched off (under unloading conditions): ventilation - 450 m3 / 4; the content of components in the original ore,%: NaCl 54.5; KCI 31.8; and about. 13.7.

In a prototype method, sylvinite ore is crushed at a plant consisting of two sections: open and closed cycles. Then, with the maximum capacity of the plant based on the initial power equal to 2.1 kg / min, ores of no more than 1.24 kg / min can enter the closed grinding circuit. At the same time, in the first section, an insoluble residue (I.O.), as the most difficult to grind part of the ore, accumulates.

About 10% of N.O. will fall into the finished product at any separation in the separator. Then (with a slightly longer residence time in a closed grinding process, the method of selective grinding of ore, including feeding it into the grinding circuit, impacting impact and abrasive loads, and withdrawing the crushed products, characterized in that, in order to increase 25 productivity, intensify the process of enrichment and improve the quality of final products , the ore is fed periodically, and the grinding from the moment the ore is supplied to the maximum filling of the grinding circuit is carried out in an unspecified circuit from the circulating his product is 30 Shems mode with accumulation it is difficult to allocate a product containing up to 22.8% N.O.

In tab. Figure 2 shows the experimental data obtained when the initial feed was removed after the maximum filling of the ground components in the circulating product was taken, then the ore feed was stopped and the circulating product was ground in the discharge mode and then removed from the grinding circuit.

0

whip grinding circuit in terms of its overload. From the data of Table 2 it can be seen that such a mode allows increasing the content of N.O. in the circulating product up to 48% due to additional grinding of intergrowths.

Thus, the increase in quality compared with the prototype method is 14%.

The arrangement of at least two closed grinding circuits, connected in parallel in a single closed ventilated circuit, provides intensive loading and unloading for all technological regimes presented in Table. 1 and tab. 2, with higher productivity and improved quality of a difficult to grind product.

Claims (1)

Invention Formula A method of selectively grinding ore, including feeding it into a grinding circuit, impacting impact and abrasive loads and withdrawing crushed products, characterized in that, in order to increase productivity, intensify the beneficiation process and improve the quality of the final products, the ore is fed periodically, and grinding from supplying the ore to the maximum filling of the grinding circuit is carried out in the uninstallable components in the circulating product, then the ore feed is stopped and the circulating ucts doizmel- chayut in discharge mode with its subsequent removal from the grinding circuit.