CN119124953A - A method for selecting polyacrylamide flocculant for tailings concentration - Google Patents
A method for selecting polyacrylamide flocculant for tailings concentration Download PDFInfo
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- CN119124953A CN119124953A CN202411268500.3A CN202411268500A CN119124953A CN 119124953 A CN119124953 A CN 119124953A CN 202411268500 A CN202411268500 A CN 202411268500A CN 119124953 A CN119124953 A CN 119124953A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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Abstract
本发明提供一种用于尾矿浓缩的聚丙烯酰胺絮凝剂的选型方法。该聚丙烯酰胺的选型方法包括如下步骤：将各备选型号的聚丙烯酰胺配置成相同的浓度作为试验样品。将尾矿配置成特定浓度的悬浊液，并将各备选的聚丙烯酰胺试验样品加入悬浊液中，同时在悬浊液鼓入氮气。在预设时间段内取漂浮于悬浊液上方的固体，并干燥。计算得到的固体矿物占尾矿的质量百分数。然后根据各备选型号的聚丙烯酰胺对应的固体矿物的质量百分数选择合适的聚丙烯酰胺。通过所述选型方法可以针对尾矿准确快速地选出合适的聚丙烯酰胺絮凝剂，进而提高尾矿的浓缩效率。
The present invention provides a method for selecting a polyacrylamide flocculant for tailings concentration. The method for selecting polyacrylamide comprises the following steps: configuring each alternative model of polyacrylamide to the same concentration as a test sample. The tailings are configured into a suspension of a specific concentration, and each alternative polyacrylamide test sample is added to the suspension, and nitrogen is bubbled into the suspension. The solid floating above the suspension is taken within a preset time period and dried. The mass percentage of solid minerals in the tailings is calculated. Then, a suitable polyacrylamide is selected according to the mass percentage of solid minerals corresponding to each alternative model of polyacrylamide. The selection method can accurately and quickly select a suitable polyacrylamide flocculant for the tailings, thereby improving the concentration efficiency of the tailings.
Description
Technical Field
The invention relates to the technical field of tailing treatment, in particular to a type selection method of a polyacrylamide flocculant for tailing concentration.
Background
During the mining production process, a large amount of tailings are produced. Treatment of tailings has been one of the important problems in the mining field. The concentration of the tailings is an important link of tailings treatment, and the volume of the tailings can be reduced through concentration, so that the treatment cost of the tailings is reduced. The polyacrylamide flocculant is a common tailing thickener, and can quickly coagulate solid particles in tailings into larger particles, so that the sedimentation speed of the tailings is increased, and the concentration efficiency of the tailings is improved.
However, there are large differences in performance among different types of polyacrylamide flocculants, and how to select an appropriate polyacrylamide flocculant is critical to the tailings concentration process. At present, the commonly used polyacrylamide flocculant type selection method is mainly selected through empirical judgment or small-scale test, and has certain blindness and uncertainty, so that the most suitable flocculant is difficult to select.
Disclosure of Invention
Based on the problems, the invention provides a type selection method of a polyacrylamide flocculant for concentrating tailings. By the method, the proper polyacrylamide flocculant can be accurately and rapidly selected for the tailings, so that the concentrating efficiency of the tailings is improved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for selecting a polyacrylamide flocculant for concentrating tailings comprises the following steps:
Preparing a plurality of alternative polyacrylamide flocculant samples into test solutions with equal concentrations, preparing tailings into a plurality of tailing suspensions with preset concentrations, wherein the plurality of test solutions are in one-to-one correspondence with the plurality of tailing suspensions;
step two, mixing a plurality of test solutions with a plurality of tailing suspension in a one-to-one correspondence manner to obtain a plurality of mixed solutions;
Step three, respectively bubbling nitrogen into a plurality of mixed liquids, and collecting the mixed liquids within a preset distance from the liquid surface of each mixed liquid downwards as a calculation sample after bubbling for the same time;
Respectively carrying out solid-liquid separation treatment on each calculated sample to obtain a separated solid-phase product;
and fifthly, calculating the mass percent of each solid-phase product to the tailings in the corresponding mixed liquid, and taking the alternative polyacrylamide flocculant sample corresponding to the solid-phase product with the largest mass percent as the target polyacrylamide flocculant.
In some of these embodiments, the mass concentration of the alternative polyacrylamide flocculant in the test solution is 0.1% -0.5%.
In some of these embodiments, the mass concentration of tailings in the tailings suspension is 15% -40%.
In some of these embodiments, the tailings have a particle size of from 20 μm to 75 μm.
In some embodiments, nitrogen is bubbled into the tailing suspension during the process of mixing a plurality of test solutions with a plurality of tailing suspensions in a one-to-one correspondence.
In some of these embodiments, the nitrogen is bubbled at a rate of 0.5L/min to 2L/min.
In some embodiments, nitrogen is bubbled into the mixture for a period of time ranging from 5 minutes to 20 minutes.
In some embodiments, the predetermined distance is 0.2-0.7 times the depth of the mixed liquor.
In some of these embodiments, collecting each mixed liquor within a predetermined distance from its level down as a calculated sample includes drawing mixed liquor within the predetermined distance from the level of the mixed liquor as a calculated sample.
In some embodiments, the solid-liquid separation process comprises one or more of a centrifugation process and a filtration process.
Advantageous effects
Unlike the current common mode of selecting the type through sedimentation, the invention creatively provides a type selection method of the polyacrylamide flocculant for concentrating tailings. The method comprises the steps of mixing a plurality of polyacrylamide flocculants with the same concentration with a plurality of tailing suspensions in a one-to-one correspondence manner. And then nitrogen is blown into the mixed liquid, and after the nitrogen is blown for a certain time, the mixed liquid in a preset distance from the liquid surface of each mixed liquid downwards is collected as a calculation sample. And then carrying out solid-liquid separation on the calculated sample to obtain a solid-phase product. And evaluating the applicability of each alternative polyacrylamide flocculant sample by calculating the mass percent of the solid phase product to the tailings in the corresponding mixed solution, and taking the alternative polyacrylamide flocculant sample corresponding to the solid phase product with the largest mass percent as the target polyacrylamide flocculant. The type selection method can accurately and quickly screen out the polyacrylamide flocculant matched with the tailings, and provides a novel method for selecting the type of the polyacrylamide flocculant for concentrating the tailings.
Furthermore, in the type selection method, the bubbling of nitrogen can reduce the contact between tailings in the mixed liquor and oxygen, so that adverse effects on the type selection result caused by oxidation of the tailings can be reduced, and the type selection method can be higher in accuracy.
Drawings
FIG. 1 is a flow chart of a method of selecting a type of polyacrylamide flocculant for tailings concentration in an embodiment of the present invention.
Detailed Description
When tailings are treated, the properties of different types of polyacrylamide flocculants are greatly different, and how to select a proper polyacrylamide flocculant is important for concentrating the tailings. At present, the commonly used polyacrylamide flocculant type selection method is mainly selected through empirical judgment or small-scale test, and has certain blindness and uncertainty, so that the most suitable flocculant is difficult to select.
Referring to fig. 1, an embodiment of the present invention provides a method for selecting a polyacrylamide flocculant for concentrating tailings. The method comprises the steps of preparing a plurality of candidate polyacrylamide flocculant samples into test solutions with equal concentrations, preparing tailings into a plurality of tailings suspension with preset concentrations, and enabling the plurality of test solutions to correspond to the plurality of tailings suspension one by one. And step two, mixing a plurality of test solutions with a plurality of tailing suspension in a one-to-one correspondence manner to obtain a plurality of mixed solutions. And thirdly, respectively bubbling nitrogen into a plurality of mixed liquids, and collecting the mixed liquids within a preset distance from the liquid surface of each mixed liquid downwards as a calculation sample after bubbling the nitrogen for the same time. And step four, respectively carrying out solid-liquid separation treatment on each calculated sample to obtain a separated solid-phase product. And fifthly, calculating the mass percent of each solid-phase product to the tailings in the corresponding mixed liquid, and taking the alternative polyacrylamide flocculant sample corresponding to the solid-phase product with the largest mass percent as the target polyacrylamide flocculant.
Unlike the current common mode of selecting the type through sedimentation, the invention creatively provides a type selection method of the polyacrylamide flocculant for concentrating tailings. The method comprises the steps of mixing a plurality of polyacrylamide flocculants with the same concentration with a plurality of tailing suspensions in a one-to-one correspondence manner. And then nitrogen is blown into the mixed liquid, and after the nitrogen is blown for a certain time, the mixed liquid in a preset distance from the liquid surface of each mixed liquid downwards is collected as a calculation sample. And then carrying out solid-liquid separation on the calculated sample to obtain a solid-phase product. And evaluating the applicability of each alternative polyacrylamide flocculant sample by calculating the mass percent of the solid phase product to the tailings in the corresponding mixed solution, and taking the alternative polyacrylamide flocculant sample corresponding to the solid phase product with the largest mass percent as the target polyacrylamide flocculant. The type selection method can accurately and quickly screen out the polyacrylamide flocculant matched with the tailings, and provides a novel method for selecting the type of the polyacrylamide flocculant for concentrating the tailings.
Furthermore, in the type selection method, the bubbling of nitrogen can reduce the contact between tailings in the mixed liquor and oxygen, so that adverse effects on the type selection result caused by oxidation of the tailings can be reduced, and the type selection method can be higher in accuracy.
Alternatively, the number of the plurality of samples of the alternative polyacrylamide flocculant may be 2-10. For example, the number of the plurality of alternative polyacrylamide flocculant samples may be 2, 3, 4, 5, 6, 7, 8, 9, 10, etc.
Optionally, in order to further improve the efficiency of the polyacrylamide flocculant type selection, the mass concentration of tailings in the plurality of tailings suspension is equal. For example, a tailing suspension having a predetermined concentration may be prepared first, and then the tailing suspension may be equally divided into a plurality of portions.
In some of these embodiments, the mass concentration of the alternative polyacrylamide flocculant in the test solution is 0.1% -0.5%. The quality concentration of the alternative polyacrylamide flocculant in the test solution is too low to obtain a good flocculation effect, and the quality concentration of the alternative polyacrylamide flocculant in the test solution is too high to be possibly combined with impurities in tailings, so that the accuracy of a model selection result is affected. Alternatively, the mass concentration of the alternative polyacrylamide flocculant in the test solution may be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%. It will be appreciated that the mass concentration of the alternative polyacrylamide flocculant in the test solution may be selected to be in the range of 0.1% to 0.5%. Alternatively, the solvent in the test solution is water.
In some of these embodiments, the mass concentration of tailings in the tailings suspension is 15% -40%. I.e. the preset concentration is 15% -40%. Too small mass concentration of tailings in the tailings suspension can prolong the time of polyacrylamide type selection and tailings treatment, and reduce the efficiency of polyacrylamide type selection and tailings treatment. The mass concentration of the tailings in the tailings suspension is too large to accurately reflect the actual working condition of the tailings, and meanwhile, a large amount of polyacrylamide flocculant is consumed due to the fact that the mass concentration of the tailings in the tailings suspension is too large, so that the cost of polyacrylamide type selection and tailings treatment is increased. Alternatively, the mass concentration of tailings in the tailings suspension may be, but is not limited to, 15%, 16%, 17%, 18%, 19%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, etc. It will be appreciated that the mass concentration of tailings in the tailings suspension may be selected in the range 15% -40% as appropriate.
In some of these embodiments, the tailings have a particle size of from 20 μm to 75 μm. The particle size of the tailings is too small or too small to accurately reflect the actual working condition of the tailings, and the suitability of the polyacrylamide flocculant selected by the selection and the tailings may be poor. In addition, the excessive particle size of the tailings can cause the consumption of the polyacrylamide to be increased, and the type selection cost of the polyacrylamide flocculant is increased. Alternatively, the particle size of the tailings may be 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, etc. It will be appreciated that the particle size of the tailings may be selected in other suitable ways, in the range 20 μm to 75 μm.
In some embodiments, nitrogen is bubbled into the tailing suspension during the process of mixing a plurality of test solutions with a plurality of tailing suspensions in a one-to-one correspondence. The interaction between the test solution and the tailing suspension can be improved through the bubbling of nitrogen, and the mixing of the test solution and the tailing suspension is promoted. Optionally, in the process of mixing the plurality of test solutions with the plurality of tailing suspension in a one-to-one correspondence manner, nitrogen is blown into the tailing suspension, and the blowing speed of the nitrogen is 0.5L/min-2L/min. Alternatively, the bubbling speed of nitrogen may be, but is not limited to, 0.5L/min, 0.8L/min, 1L/min, 1.2L/min, 1.5L/min, 1.8L/min, 2L/min, etc. It will be appreciated that the nitrogen bubbling rate may be selected to be in the range of 0.5L/min-2L/min.
In some embodiments, the nitrogen is bubbled into the mixed liquor at a bubbling rate of 0.5L/min to 2L/min. Alternatively, the bubbling speed of nitrogen may be, but is not limited to, 0.5L/min, 0.8L/min, 1L/min, 1.2L/min, 1.5L/min, 1.8L/min, 2L/min, etc. It will be appreciated that the nitrogen bubbling rate may be selected to be in the range of 0.5L/min-2L/min. It can be further understood that in the process of mixing a plurality of test solutions with a plurality of tailing suspensions in a one-to-one correspondence manner, nitrogen is blown into the tailing suspensions, and the nitrogen is kept blown into the mixed solution. In the process of mixing a plurality of test solutions and a plurality of tailing suspensions in a one-to-one correspondence manner, nitrogen is continuously blown into the tailing suspensions, and when the nitrogen is blown into the tailing suspensions, the blowing speed of the nitrogen is equal.
In some embodiments, nitrogen is bubbled into the mixture for a period of time ranging from 5 minutes to 20 minutes. The nitrogen blowing time is too short to fully exert the effect of nitrogen, and too long can prolong the time of the polyacrylamide flocculant type selection, reduce the type selection efficiency. Optionally, nitrogen is blown into the mixed solution, and the time of blowing the nitrogen is not limited to 5min, 6min, 7min, 8min, 9min, 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min, 18min, 19min, 20min, etc. It will be appreciated that the time for bubbling nitrogen may be selected within the range of 5min-20min.
In some embodiments, the predetermined distance is 0.2-0.7 times the depth of the mixed liquor. The mass of tailings collected when the preset distance is too small, and the obtained result is difficult to fully reflect the flocculation effect of the polyacrylamide flocculant. When the preset distance is too large, the mass of the collected tailings is too large, and the actual flocculation effect of the polyacrylamide flocculant is difficult to fully reflect.
It is understood that the depth of the mixed liquor represents the distance between the liquid level of the mixed liquor and the bottom of the mixed liquor. Alternatively, the preset distance is 0.2 times, 0.3 times, 0.4 times, 0.5 times, 0.6 times, 0.7 times, etc. the depth of the mixed liquid. It will also be appreciated that the preset distance may also be other values in the range of 0.2-0.7 times the depth of the mixed liquor.
In some of these embodiments, collecting each mixed liquor within a predetermined distance from its level down as a calculated sample includes drawing mixed liquor within the predetermined distance from the level of the mixed liquor as a calculated sample. The method can avoid the influence of the mixed liquor below the preset distance on the model selection result on the basis of fully collecting the mixed liquor within the preset distance in a suction mode, and further can improve the model selection accuracy of the polyacrylamide flocculant.
In some embodiments, the solid-liquid separation process comprises one or more of a centrifugation process and a filtration process. It can be understood that the moisture in the solid-phase product can be further removed in a drying mode after the solid-liquid separation treatment, so that the accuracy of the quality of the collected tailings is improved, and the accuracy of the type selection of the polyacrylamide flocculant is further improved.
In yet another embodiment of the invention, a method for sizing a polyacrylamide flocculant for tailings concentration is provided. The method for selecting the model comprises the following steps:
And S01, preparing a plurality of alternative polyacrylamide flocculant samples into test solutions with equal concentrations, and preparing tailings into a plurality of tailings suspension with preset concentrations, wherein the test solutions are in one-to-one correspondence with the tailings suspension. The mass concentration of the alternative polyacrylamide flocculant in the test solution is 0.1% -0.5%. The particle size of the tailings is 20-75 mu m. The mass concentration of the tailings in the tailings suspension is 15% -40%.
S02, mixing a plurality of test solutions and a plurality of tailing suspensions in a one-to-one correspondence manner to obtain a plurality of mixed solutions. During the mixing process, nitrogen is blown into the tailing suspension. The bubbling speed of nitrogen is 0.5L/min-2L/min.
And S03, respectively filling nitrogen into the mixed liquids, and after the same time of filling, collecting the mixed liquids within a preset distance from the liquid surface of each mixed liquid downwards as a calculation sample. The bubbling speed of nitrogen is 0.5L/min-2L/min. The nitrogen is blown in for 5min-20min. The preset distance is 0.2-0.7 times of the depth of the mixed solution. Optionally, collecting each mixed liquor within a preset distance from the liquid surface of each mixed liquor downwards as a calculation sample comprises sucking the mixed liquor within the preset distance from the liquid surface of the mixed liquor as a calculation sample.
S04, respectively carrying out solid-liquid separation treatment on each calculated sample to obtain a separated solid-phase product. The solid-liquid separation treatment includes one or more of a centrifugation treatment and a filtration treatment.
S05, calculating the mass percentage of each solid-phase product to the tailings in the corresponding mixed solution, and taking the alternative polyacrylamide flocculant sample corresponding to the solid-phase product with the largest mass percentage as the target polyacrylamide flocculant.
The following describes the technical scheme of the present invention in detail with reference to specific examples.
Example 1
The type selection method of the polyacrylamide flocculant for concentrating tailings in the embodiment comprises the following steps:
S101, preparing 4 alternative polyacrylamide flocculant samples (respectively marked as a sample A, a sample B, a sample C and a sample D) into test solutions with mass concentrations of 0.5 percent. Tailings with the particle size of 70 μm are prepared into 4 parts of suspension with the mass concentration of 15 percent.
S102, mixing 4 test solutions and 4 tailing suspension solutions in a one-to-one correspondence manner to obtain a plurality of mixed solutions. During the mixing process, nitrogen is blown into the tailing suspension. The bubbling rate of nitrogen was 1L/min.
S103, respectively injecting nitrogen into 4 parts of mixed liquid, wherein the injection speed of the nitrogen is 1L/min. After nitrogen is blown in for 10min, the mixed liquid within a preset distance is sucked from the liquid surface of the mixed liquid to be used as a calculation sample. The preset distance is 0.4 times the depth of the mixed solution.
And S104, respectively carrying out centrifugal treatment and drying on each calculated sample to obtain a separated solid-phase product.
S05, calculating the mass percentage of each solid-phase product to the tailings in the corresponding mixed solution, wherein the mass percentage is respectively 2.2 percent (sample A), 2.8 percent (sample B), 2.5 percent (sample C) and 2.1 percent (sample D). It can be seen that sample B corresponds to the greatest mass percent, and thus sample B is the target polyacrylamide flocculant.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures for carrying out the several purposes of the present invention.
Claims (10)
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Citations (4)
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|---|---|---|---|---|
| US20160310964A1 (en) * | 2015-04-24 | 2016-10-27 | SYNCRUDE CANADA LTD. in trust for the owners of the Syncrude Project as such owners exist now and | Clay flotation of tailings |
| CN114031208A (en) * | 2021-10-18 | 2022-02-11 | 广东众城生态环境发展有限公司 | Industrial wastewater treatment process |
| CN116559034A (en) * | 2023-06-29 | 2023-08-08 | 本溪钢铁（集团）矿业有限责任公司 | A type selection method of polyacrylamide flocculant for tailings concentration |
| CN219839539U (en) * | 2021-09-30 | 2023-10-17 | 北京首敬科技有限公司 | Intelligent fine separation system |
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- 2024-09-11 CN CN202411268500.3A patent/CN119124953A/en active Pending
Patent Citations (4)
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| US20160310964A1 (en) * | 2015-04-24 | 2016-10-27 | SYNCRUDE CANADA LTD. in trust for the owners of the Syncrude Project as such owners exist now and | Clay flotation of tailings |
| CN219839539U (en) * | 2021-09-30 | 2023-10-17 | 北京首敬科技有限公司 | Intelligent fine separation system |
| CN114031208A (en) * | 2021-10-18 | 2022-02-11 | 广东众城生态环境发展有限公司 | Industrial wastewater treatment process |
| CN116559034A (en) * | 2023-06-29 | 2023-08-08 | 本溪钢铁（集团）矿业有限责任公司 | A type selection method of polyacrylamide flocculant for tailings concentration |
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Application publication date: 20241213 |