CN114226059A - Method for improving recovery rate of graded tailings - Google Patents
Method for improving recovery rate of graded tailings Download PDFInfo
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- CN114226059A CN114226059A CN202111450198.XA CN202111450198A CN114226059A CN 114226059 A CN114226059 A CN 114226059A CN 202111450198 A CN202111450198 A CN 202111450198A CN 114226059 A CN114226059 A CN 114226059A
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Abstract
The application relates to the technical field of tailing treatment, and provides a method for improving the recovery rate of graded tailing, which comprises the following steps: carrying out first rotational flow treatment on the feeding slurry according to a first separation granularity value to obtain first settled sand and first overflow; and carrying out second rotational flow treatment on the first overflow according to a second separation particle size value to obtain second settled sand and second overflow, wherein the first separation particle size value is larger than the second separation particle size value. According to the method for improving the recovery rate of the graded tailings, on one hand, the first cyclone treatment is carried out according to the first separation granularity value, the risk of blockage of tailings contained in the ore slurry can be reduced or even eliminated, part of coarse-grain tailings are separated in advance, the production pressure of the second cyclone is reduced, the throughput of the sand setting nozzle of the second small-diameter cyclone is further reduced, and the blockage risk is reduced.
Description
Technical Field
The application belongs to the technical field of tailing treatment, and particularly relates to a method for improving the recovery rate of graded tailing.
Background
After years of scientific research and production practice, the lead-zinc ore tailings form the current technical route of tailings classification-coarse and fine separate dehydration. Coarse fraction tailings (grading tailings) produced by the cyclone grading-ceramic filter can be used as a high-quality filling raw material to provide powerful guarantee for meeting the underground filling quality requirement and mine safety; the production and utilization of the micro-fine fraction tailings reduce the external discharge amount of the tailings and prolong the service life of a tailing pond. Although tailings production practices have made a great contribution to the technical economy of lead-zinc ores, the environmental protection policies of the state are tightened up with the new situation. Therefore, speeding up and increasing the recovery and utilization of tailings have become a practical problem for mines. For Van kou mine, the most direct approach for tailing utilization is to recover tailings and fill the underground mined-out area. If more tailings can be recycled on the graded tailings with relatively mature recycling process and filling process, the method is helpful for gradual emission reduction of the total amount of the tailings pond and has important significance for the limited period withdrawal of the tailings pond.
Disclosure of Invention
The application aims to provide a method for improving the recovery rate of graded tailings, and aims to solve the technical problem of low recovery rate of graded tailings in the prior art.
In order to achieve the purpose of the application, the technical scheme adopted by the application is as follows:
the application provides a method for improving the recovery rate of graded tailings, which comprises the following steps: carrying out first rotational flow treatment on the feeding slurry according to a first separation granularity value to obtain first settled sand and first overflow;
and carrying out second rotational flow treatment on the first overflow according to a second separation particle size value to obtain second settled sand and second overflow, wherein the first separation particle size value is larger than the second separation particle size value.
The application provides a method for improving rate of recovery of graded tailings carries out first cyclone treatment according to first separation particle size value on the one hand, can reduce or even eliminate the risk of tailing blockage contained in the ore feeding slurry, and divide out partly coarse grain tailings in advance, alleviate the production pressure of second swirler, and then reduce the throughput of second minor diameter swirler sand setting nozzle, reduce the risk of blockage, on the other hand carries out second cyclone treatment according to second separation particle size value, and first separation particle size value is greater than second separation particle size value, can be under lower feed pressure, reach and reduce the separation particle size, improve the purpose of rate of recovery of graded tailings.
Drawings
FIG. 1 is a flow chart of a method for increasing the recovery of fractionated tailings provided in an embodiment of the present invention;
FIG. 2 is a flow chart of another method for increasing the recovery of fractionated tailings provided in an embodiment of the present invention;
FIG. 3 is a graph showing the effect of feed slurry on sand sediment yield provided in an example of the present invention;
FIG. 4 is a graph illustrating the effect of a feed slurry on the integrated sand setting concentration provided in an example of the present invention;
FIG. 5 is a line drawing illustrating the product particle size composition of a second cyclone provided in an embodiment of the present invention;
FIG. 6 is a graph of the efficiency of a second cyclone classification provided in an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In this application, the term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.
It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The mass of the related components mentioned in the description of the embodiments of the present application may not only refer to the specific content of each component, but also represent the proportional relationship of the mass between each component, and therefore, it is within the scope of the disclosure of the description of the embodiments of the present application as long as the content of the related components is scaled up or down according to the description of the embodiments of the present application. Specifically, the mass described in the specification of the embodiments of the present application may be a mass unit known in the chemical industry field such as μ g, mg, g, kg, etc.
The terms "first" and "second" are used for descriptive purposes only and are used for distinguishing purposes such as substances from one another, and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. For example, a first XX may also be referred to as a second XX, and similarly, a second XX may also be referred to as a first XX, without departing from the scope of embodiments of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The first aspect of the embodiment of the present application provides a method for improving the recovery rate of graded tailings, as shown in fig. 1, including the following steps:
step S1, carrying out first cyclone treatment on the feeding slurry according to a first separation granularity value to obtain first settled sand and first overflow;
and step S2, performing second cyclone treatment on the first overflow according to a second separation particle size value to obtain second settled sand and second overflow, wherein the first separation particle size value is larger than the second separation particle size value.
The embodiment of the application adopts the first cyclone treatment and the second cyclone treatment with different separation granularity values, so that the purpose of improving the recovery rate of the classified tailings can be realized, specifically, the first cyclone treatment is carried out according to the first separation granularity value, so that the risk of tailing blockage contained in the underflow can be reduced or even eliminated, a part of coarse-grained tailings can be separated in advance, the production pressure of the second cyclone treatment is reduced, the flux of a sand setting nozzle of the second cyclone treatment is reduced, the blockage risk is reduced, the second cyclone treatment is carried out according to the second separation granularity value, and the purposes of reducing the separation granularity and improving the recovery rate of the classified tailings can be achieved under lower feeding pressure.
In an embodiment, the first cyclone processing method in step S01 includes the steps of:
the feed slurry was subjected to a first swirling treatment using a first swirler having a diameter of 150 mm.
In an embodiment, the second cyclone processing method in step S02 includes the steps of:
and carrying out second rotational flow treatment on the first overflow by using a second rotational flow device with the diameter of 100mm to obtain second settled sand and second overflow.
In a further embodiment, the first swirling processing method in step S01 and the first swirling processing method in step S02 include the steps of:
carrying out first rotational flow treatment on the feeding slurry by using a first rotational flow device with the diameter of 150 mm; and simultaneously, carrying out second rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm to obtain second settled sand and second overflow.
According to the embodiment of the application, the cyclone with the larger diameter is selected for the first cyclone treatment, the risk of tailing blockage contained in the underflow can be reduced or even eliminated, part of coarse-grain tailing can be separated in advance, the production pressure of the second cyclone is reduced, the throughput of the sand setting nozzle of the second small-diameter cyclone is further reduced, the blockage risk is reduced, and the small-diameter cyclone is used for the second cyclone treatment, so that the purposes of reducing the separation particle size and improving the recovery rate of the graded tailing can be achieved under the lower feeding pressure.
In the embodiment, the feeding slurry comprises underflow obtained by treating mill tailings by a phi 24M thickener.
In the embodiment, the mass ratio of the tailings in the feeding slurry is 20-30%, and specifically, the tailings may be typical but not limiting tailings concentrations such as 20%, 24%, 26%, 30%.
In an embodiment, the first cyclone is used for performing the first cyclone treatment, and the first cyclone treatment conditions are as follows:
diameter of the first swirler: 100mm
Taper angle: 20 degrees;
feeding pressure: 0.06 MPa;
the diameter of the sand setting pipe is as follows: 12 mm;
diameter of overflow pipe: 24 mm;
wherein, the structural parameters of the cyclone are unchanged, and the yield of the sand setting operation is reduced from 45.29% to 39.15% with the increase of the ore feeding slurry from 19.70% to 29.46%, but the change of the sand setting concentration is not large and is kept at about 80%; the overflow concentration increased from 12.14% to 20.95%. If the overflow of the later-stage swirler does not return to the phi 24M thickener, the structural parameters of the swirler can adapt to 30% of ore feeding slurry, and the yield of settled sand is kept above 40%.
In some embodiments, the feeding pressure of the first cyclone is 0.04-0.12 Mpa, wherein the feeding pressure may be 0.04Mpa, 0.06Mpa, 0.09Mpa, 0.12Mpa, 0.15Mpa, and the first sand setting yield may be improved.
Further, the structural parameters of the first cyclone are as follows:
feeding ore slurry: 24% mass concentration;
diameter of the cyclone: 100 mm;
taper angle: 20 degrees;
the diameter of the sand setting pipe is as follows: 12 mm;
diameter of overflow pipe: 24mm
The experimental result shows that the sand setting yield is increased from 43.65% to 58.10% when the ore feeding pressure is increased from 0.04MPa to 0.15 MPa; the overflow concentration is reduced from 13.29% to 11.51%. Since the energy consumption of the first cyclone is proportional to the feeding pressure, the lower the energy consumption of the cyclone correspondingly. Considering that the ore feeding pressure is correspondingly increased when the subsequent cyclone is amplified, in order to avoid adopting high pressure on the large-diameter cyclone and ensure that the first cyclone has proper sand settling yield, comprehensively comparing, selecting the cone angle of the first cyclone to be 20 degrees, the diameter of the sand settling pipe to be 12mm, the diameter of the overflow pipe to be 24mm and the ore feeding pressure to be 0.06 MPa.
In the examples, the first cyclone treatment had a separation particle size of 32.51 μm with a larger separation particle size.
In the embodiment, the cone angle of the first cyclone is 45 degrees, the diameters of the sand settling pipes can be 8mm, 10mm, 12mm, 14mm and 16mm, the sand settling concentration can still reach more than 60 percent when the sand settling operation yield is improved to 60 percent by adjusting the size of the sand settling nozzle of the cyclone, and the overflow concentration of the cyclone is reduced to about 13.32 percent.
In some embodiments, the cone angle of the first cyclone is 20 degrees, the diameter of the grit tube can be 8mm, 10mm, 12mm, 14mm and 16mm, and the first grit concentration can still reach more than 64% and the first overflow concentration can be reduced to about 12% when the grit nozzle of the cyclone is adjusted to improve the first grit operation yield to 62%.
The diameters of the overflow pipes can be 22mm, 24mm, 26mm and 28mm, and when the recovery rate of the first cyclone classification tailings reaches 42 percent (the classification tailings obtained after the first settled sand is filtered), and the concentration reaches more than 70 percent.
The operation yield of the second cyclone is only 31.61%, and the concentration is 36.66%. Therefore, the overflow pipe diameter of the second cyclone is 22mm, and the feeding pressure is 0.15mpa, which meets the design requirement.
In the embodiment, the diameter of the sand settling pipe of the second cyclone can be 8mm, 10mm and 12mm, wherein when the diameter of the sand settling pipe is 8mm, the comprehensive yield of the sand settling is 59.08%, and the mixed sand settling concentration is as high as 77.41%, but the diameter of the sand settling pipe is too small because of the risk of blockage of the cyclone caused by intermittent columnar ore discharge. And when the contrast grit tube is 10mm and 12mm, the index of the cyclone grading product is contrasted, and the diameter of the selected grit tube is 10 mm.
In the embodiment, the mass ratio of tailings contained in the first overflow can be 12%, 15%, 20% and 25%, when the feeding slurry of the second cyclone is increased from 12% to 25%, the sand settling yield of the second cyclone is reduced from 40.74% to 31.85%, and the sand settling concentration is increased from 46% to 61.28%; the comprehensive grit yield is reduced from 67.83% to 58.14%, and the comprehensive grit concentration is kept above 60%. Therefore, the great improvement of the feeding slurry of the second cyclone is not beneficial to the improvement of the comprehensive sand setting yield.
In the examples, the separation particle size of the second cyclone treatment was 7.26 μm with a smaller separation particle size.
In an embodiment, the method further includes step S3, where the first sand setting or/and the second sand setting is subjected to a first filtering process to obtain the comprehensive graded tailings.
Furthermore, in the first filtering treatment method, the small ceramic plate is used as a filtering medium, the vacuum degree of the vacuum pump is 0.084MPa, and the newly prepared comprehensive graded tailings can still achieve lower filter cake moisture and higher filter cake capacity by using the ceramic plate for filtering even if the granularity is thinned. The filtration test result also shows that the higher filtration capacity can be obtained on the premise of keeping the low water content of the filter cake by adopting the higher rotation speed of the filter.
In an embodiment, the method further includes step S4, performing a second filtering process on the second underflow to obtain a fine fraction of tailings.
Further, a second filtering treatment is carried out by a phi 30M thickener, and fine-fraction tailings can be separated from the second underflow.
The following description will be given with reference to specific examples.
Example 1
FIG. 1 provides a flow diagram of a method for increasing the recovery of fractionated tailings. Specifically, the method comprises the following steps:
step S1, performing first rotational flow treatment on the ore feeding slurry with the mass concentration of 19% by using a first cyclone with the diameter of 150mm, wherein the taper angle of the first cyclone is 20 degrees, the diameter of a grit tube is 12mm, the diameter of an overflow tube is 24mm, the ore feeding pressure is 0.06MPa, and first settled sand with the mass concentration of 78% and first overflow with the mass concentration of 12.58% are obtained, wherein the first separation particle size value is 32.51 microns.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of the overflow pipe is 22mm, the diameter of the grit pipe is 8mm, the ore feeding pressure is 0.15MPa, and second grit with the mass concentration of 25.47% and second overflow with the mass concentration of 74.53% are obtained, wherein the second separation particle size value is 7.26 mu m.
Example 2
Step S1, performing first rotational flow treatment on the ore feeding slurry with the mass concentration of 19% by using a first cyclone with the diameter of 150mm, wherein the taper angle of the first cyclone is 20 degrees, the diameter of a grit tube is 12mm, the diameter of an overflow tube is 24mm, the ore feeding pressure is 0.06MPa, and first settled sand with the mass concentration of 78% and first overflow with the mass concentration of 12.58% are obtained, wherein the first separation particle size value is 32.51 microns.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of the overflow pipe is 22mm, the diameter of the grit pipe is 10mm, the ore feeding pressure is 0.15MPa, and second grit with the mass concentration of 40.70 percent and second overflow with the mass concentration of 59.30 percent are obtained, wherein the second separation particle size value is 7.26 mu m.
Example 3
Step S1, performing first rotational flow treatment on the ore feeding slurry with the mass concentration of 19% by using a first cyclone with the diameter of 150mm, wherein the taper angle of the first cyclone is 20 degrees, the diameter of a grit tube is 12mm, the diameter of an overflow tube is 24mm, the ore feeding pressure is 0.06MPa, and first settled sand with the mass concentration of 78% and first overflow with the mass concentration of 12.58% are obtained, wherein the first separation particle size value is 32.51 microns.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of the overflow pipe is 22mm, the diameter of the grit pipe is 12mm, the ore feeding pressure is 0.15MPa, and second grit with the mass concentration of 42.97% and second overflow with the mass concentration of 57.03% are obtained, wherein the second separation particle size value is 7.26 mu m.
The results of the analyses of examples 1 to 3 are shown in Table 1.
TABLE 1 influence of the second cyclone Sand setting nozzle diameter on the classification test
When the diameter of the sand settling pipe is 8mm, the comprehensive yield of the sand settling reaches 59.08%, the concentration of the mixed sand settling is as high as 77.41%, but the cyclone is blocked due to intermittent columnar ore discharge, so the diameter of the sand settling pipe is too small. And when the contrast grit tube is 10mm and 12mm, the index of the cyclone grading product is contrasted, and the diameter of the selected grit tube is 10 mm.
Example 4
Step S1, a first cyclone with the diameter of 150mm is used for carrying out first cyclone treatment on the feeding slurry with the mass concentration of 12%, the cone angle of the first cyclone is 20 degrees, the diameter of a grit tube is 12mm, the diameter of an overflow tube is 24mm, the feeding pressure is 0.06MPa, and first settled sand with the mass concentration of 78% and first overflow with the mass concentration of 12% are obtained, wherein the first separation particle size value is 32.51 microns.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of the overflow pipe is 22mm, the diameter of the grit pipe is 8mm, the ore feeding pressure is 0.15MPa, and second grit with the mass concentration of 59.26% and second overflow with the mass concentration of 40.74% are obtained, wherein the second separation particle size value is 7.26 microns.
Example 5
Step S1, a first cyclone with the diameter of 150mm is used for carrying out first cyclone treatment on the ore feeding slurry with the mass concentration of 15%, the cone angle of the first cyclone is 20 degrees, the diameter of a grit tube is 12mm, the diameter of an overflow tube is 24mm, the ore feeding pressure is 0.06MPa, and first settled sand with the mass concentration of 78% and first overflow with the mass concentration of 12.58% are obtained, wherein the first separation particle size value is 32.51 microns.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of the overflow pipe is 22mm, the diameter of the grit pipe is 8mm, the ore feeding pressure is 0.15MPa, and second grit with the mass concentration of 41.59 percent and second overflow with the mass concentration of 58.41 percent are obtained, wherein the second separation particle size value is 7.26 mu m.
Example 6
1. Step S1, performing first cyclone treatment on the ore feeding slurry with the mass concentration of 20% by using a first cyclone with the diameter of 150mm, wherein the first cyclone has the cone angle of 20 degrees, the diameter of a grit tube is 12mm, the diameter of an overflow tube is 24mm, and the ore feeding pressure is 0.06MPa, so as to obtain first grit with the mass concentration of 78% and first overflow with the mass concentration of 12.58%, wherein the first separation particle size value is 32.51 mu m.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of the overflow pipe is 22mm, the diameter of the grit pipe is 8mm, the ore feeding pressure is 0.15MPa, and second grit with the mass concentration of 33.47% and second overflow with the mass concentration of 66.53% are obtained, wherein the second separation particle size value is 7.26 mu m.
Example 7
Step S1, performing first cyclone treatment on the feed slurry with the mass concentration of 25% by using a first cyclone with the diameter of 150mm, wherein the first cyclone has a cone angle of 20 degrees, a grit tube with the diameter of 12mm, an overflow tube with the diameter of 24mm and a feed pressure of 0.06MPa, and obtaining first grit with the mass concentration of 78% and first overflow with the mass concentration of 12.58%, and the first separation particle size value is 32.51 microns.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of the overflow pipe is 22mm, the diameter of the grit pipe is 8mm, the ore feeding pressure is 0.15MPa, and second grit with the mass concentration of 31.85% and second overflow with the mass concentration of 68.15% are obtained, wherein the second separation particle size value is 7.26 mu m.
The results of the analyses of examples 4 to 7 are shown in Table 2.
TABLE 2 influence of the second cyclone feed slurry on the classification test
As can be seen from fig. 3 and 4, when the cyclone feeding slurry is increased from 12% to 25%, the grit yield of the second cyclone is reduced from 40.74% to 31.85%, and the grit concentration is increased from 46% to 61.28%; the comprehensive grit yield is reduced from 67.83% to 58.14%, and the comprehensive grit concentration is kept above 60%. Therefore, the great improvement of the feeding slurry of the second cyclone is not beneficial to the improvement of the comprehensive sand setting yield.
Example 8
Step S1, performing first cyclone treatment on the ore feeding slurry with the mass concentration of 19% by using a first cyclone with the diameter of 150mm, wherein the first cyclone has the cone angle of 20 degrees, the diameter of a grit tube is 12mm, the diameter of an overflow tube is 24mm, and the ore feeding pressure is 0.06MPa, so as to obtain first grit with the mass concentration of 78% and first overflow with the mass concentration of 12.58%, wherein the first separation particle size value is 32.51 mu m.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of an overflow pipe is 24mm, the diameter of the overflow pipe is 22mm, the diameter of a grit pipe is 8mm, and the ore feeding pressure is 0.15MPa, so that second grit with the mass concentration of 25.47% and second overflow with the mass concentration of 74.53% are obtained, and the second separation particle size value is 7.26 microns.
Example 9
FIG. 1 provides a method for increasing the recovery of fractionated tailings. Specifically, the method comprises the following steps:
step S1, performing first cyclone treatment on the ore feeding slurry with the mass concentration of 19% by using a first cyclone with the diameter of 150mm, wherein the first cyclone has the cone angle of 20 degrees, the diameter of a grit tube is 12mm, the diameter of an overflow tube is 24mm, and the ore feeding pressure is 0.06MPa, so as to obtain first grit with the mass concentration of 78% and first overflow with the mass concentration of 12.58%, wherein the first separation particle size value is 32.51 mu m.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of the overflow pipe is 26mm, the diameter of the grit pipe is 8mm, the ore feeding pressure is 0.15MPa, and second grit with the mass concentration of 25.47% and second overflow with the mass concentration of 74.53% are obtained, wherein the second separation particle size value is 7.26 mu m.
Example 10
Step S1, performing first rotational flow treatment on the ore feeding slurry with the mass concentration of 19% by using a first cyclone with the diameter of 150mm, wherein the taper angle of the first cyclone is 20 degrees, the diameter of an overflow pipe is 22mm, the diameter of a grit pipe is 12mm, the diameter of the overflow pipe is 24mm, and the ore feeding pressure is 0.06MPa, so as to obtain first settled sand with the mass concentration of 78% and first overflow with the mass concentration of 12.58%, wherein the first separation particle size value is 32.51 microns.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of the overflow pipe is 28mm, the diameter of the grit pipe is 8mm, the ore feeding pressure is 0.15MPa, and second grit with the mass concentration of 25.47% and second overflow with the mass concentration of 74.53% are obtained, wherein the second separation particle size value is 7.26 mu m.
The results of the comprehensive analyses of example 2, example 8 to example 10 are shown in Table 2.
TABLE 3 second swirler overflow tube test
Wherein, the operation yield of the first overflow and the operation yield of the first sand setting do not change much when the diameter of the overflow pipe is 22mm, 24mm and 26mm, and the operation yield of the first overflow and the operation yield of the first sand setting change greatly when the diameter of the overflow pipe is 28mm, which shows that the diameters of the overflow pipe are 22mm, 24mm and 26mm have better experimental effect.
Example 11
Step S1, performing first rotational flow treatment on the ore feeding slurry with the mass concentration of 19% by using a first cyclone with the diameter of 150mm, wherein the taper angle of the first cyclone is 20 degrees, the diameter of a grit tube is 12mm, the diameter of an overflow tube is 24mm, the ore feeding pressure is 0.06MPa, and first settled sand with the mass concentration of 78% and first overflow with the mass concentration of 12.58% are obtained, wherein the first separation particle size value is 32.51 microns.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of the grit tube is 10mm, the feeding pressure is 0.15MPa, and second grit with the mass concentration of 40.70% and second overflow with the mass concentration of 59.30% are obtained, wherein the second separation particle size value is 7.26 microns.
Step S3, as shown in fig. 2, the first sand setting or/and the second sand setting is subjected to a first filtering process to obtain a comprehensive graded tailings, wherein the ceramic plate dehydration test results are shown in table 4.
TABLE 4 small-scale test results of ceramic filters
The test result shows that for the newly prepared comprehensive graded tailings, even if the granularity is thinned, the ceramic plate is used for filtering, still lower filter cake moisture and higher filter cake capacity can be achieved. The filtration test result also shows that the higher filtration capacity can be obtained on the premise of keeping the low water content of the filter cake by adopting the higher rotation speed of the filter. One 45m nozzle exists at any port2The graded tailing ceramic filter is respectively 1443 kg/m and 1639kg/m2Per hour production capacity meter, existing 45m2The capacity of the grading tailing ceramic filter can reach 64.94t/h and 73.76 t/h.
Example 12
Step S1, performing first cyclone treatment on the ore feeding slurry with the mass concentration of 19% by using a first cyclone with the diameter of 150mm, wherein the first cyclone has a cone angle 20, the diameter of a grit pipe is 12mm, the diameter of an overflow pipe is 24mm, and the ore feeding pressure is 0.06MPa, so as to obtain first grit with the mass concentration of 78% and first overflow with the mass concentration of 12.58%, wherein the first separation particle size value is 32.51 microns.
And step S2, performing second-stage rotational flow treatment on the first overflow by using a second cyclone with the diameter of 100mm, wherein the taper angle of the second cyclone is 10 degrees, the diameter of the grit tube is 10mm, the feeding pressure is 0.15MPa, and second grit with the mass concentration of 40.70% and second overflow with the mass concentration of 59.30% are obtained, wherein the second separation particle size value is 7.26 microns.
Step S4, as shown in fig. 2, the second underflow is subjected to a second filtering process by a 30M thickener to obtain fine fraction tailings.
Flow device classification performance analysis
The cyclone product size composition of example 2 was counted and the results are shown in table 5, fig. 5 and fig. 6.
TABLE 5 product size composition and separation efficiency for the second cyclone
Taking overflow generated by the first cyclone as ore feeding of the second cyclone, and carrying out laboratory grading test by using the cyclone with the diameter of 100mm to obtain: the cone angle of the second cyclone is 10 degrees, the diameter of the sand setting nozzle is 10mm, the diameter of the overflow pipe is 22mm, the ore feeding pressure is 0.15Mpa, the sand setting operation yield of the second cyclone under the condition is about 40 percent (relative to the sand setting operation yield of the whole tail of the second cyclone is 21 percent), the sand setting concentration is about 45 percent, and the particle size analysis result shows that the separation particle size of the cyclone under the condition is 7.26 mu m (the corrected separation particle size is 8.0 mu m).
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (10)
1. The method for improving the recovery rate of the classified tailings is characterized by comprising the following steps of:
carrying out first rotational flow treatment on the feeding slurry according to a first separation granularity value to obtain first settled sand and first overflow;
and carrying out second rotational flow treatment on the first overflow according to a second separation granularity value to obtain second settled sand and second overflow, wherein the first separation granularity value is larger than the second separation granularity value.
2. The method for improving the recovery rate of the graded tailings according to claim 1, wherein the first cyclone treatment is performed on the feed slurry by using a first cyclone with the diameter of 150 mm; and/or
And carrying out second rotational flow treatment on the first overflow by using a second rotational flow device with the diameter of 100mm to obtain second settled sand and second overflow.
3. The method for improving the recovery rate of the graded tailings according to claim 2, wherein the first cyclone treatment is performed by using a first cyclone, and the first cyclone treatment conditions are as follows:
the cone angle of the first cyclone is 20-45 degrees, and the diameter of a sand settling pipe of the first cyclone is 8-16 mm; or/and
the diameter of the overflow pipe of the first cyclone is 24 mm; or/and
the feeding pressure of the first cyclone is 0.04-0.15 MPa.
4. The method for improving the recovery rate of graded tailings as claimed in claim 3, wherein the yield of settled sand is between 30% and 40%, the mass concentration of the first settled sand is more than 77%, and the mass proportion of the tailings in the first overflow is 15%.
5. The method for improving the recovery rate of the graded tailings according to any one of claims 1 to 4, wherein the second cyclone treatment is performed by using a second cyclone, and the conditions of the second cyclone treatment are as follows:
the taper angle of the second cyclone is 10 degrees, and the diameter of the grit tube is 8-12 mm; or/and
the diameter of the overflow pipe of the second cyclone is 22-28 mm; or/and
the feeding pressure of the second cyclone is 0.2 MPa-0.4 MPa.
6. The method for improving the recovery rate of the classified tailings according to claim 5, wherein the yield of the second cyclone in the sand setting operation is 25-29%, and the mass concentration of the second sand setting is 45-67%.
7. The method for improving the recovery rate of the grading tailings according to any one of claims 1 to 4 and 6, further comprising the steps of carrying out first filtration treatment on the first settled sand or/and the second settled sand to obtain comprehensive grading tailings; and/or
The mass ratio of tailings contained in the feeding slurry is 30-40%.
8. The method for enhancing fractionated tailings recovery of claim 7 further comprising densifying the second overflow stream to produce a second underflow stream and a third overflow stream.
9. The method for enhancing fractional tailings recovery of claim 8 further comprising subjecting the second underflow stream to a second filtration process to produce a fine fraction of tailings.
10. The method for improving the recovery rate of the classified tailings according to any one of claims 1 to 4, 6, 8 and 9, wherein the separation particle size of the first cyclone treatment is 32.51 μm; or/and
the separation particle size of the second cyclone treatment was 7.26 μm.
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