Model selection method of polyacrylamide flocculant for tailings

Abstract

The invention discloses a type selection method of a polyacrylamide flocculating agent for tailings. The model selection method comprises the following steps: preparing polyacrylamide flocculant solutions with different concentrations, carrying out flocculation treatment on the same tailing sample by adopting the polyacrylamide flocculant solutions with different concentrations, and selecting the target concentration of the polyacrylamide flocculant solution according to the sedimentation rate. Different types of polyacrylamide flocculants are prepared into solutions with target concentrations. And different types of polyacrylamide flocculant solutions are adopted to carry out flocculation treatment on different tailing samples. And for a certain tailing sample, selecting the polyacrylamide model corresponding to the polyacrylamide flocculant solution with the fastest sedimentation rate as a target polyacrylamide flocculant. According to the type selection method, the polyacrylamide flocculant suitable for the tailing sample and the concentration of the polyacrylamide flocculant can be rapidly selected, the tailing sedimentation rate is increased, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tailings treatment, in particular to a method for selecting a polyacrylamide flocculant for tailings. Background Art

[0002] Polyacrylamide flocculant is a high molecular polymer widely used in sewage treatment, mining, papermaking and other industries. In the mineral processing industry, polyacrylamide flocculants are mainly used for tailings treatment and slurry concentration. When polyacrylamide flocculants are used for tailings treatment, the flocculation effect of polyacrylamide can make the fine particles in the tailings settle quickly, which is convenient for the sedimentation treatment of fine particles. However, different tailings have different characteristics, such as particle size, density, chemical composition, etc., which requires the selection of appropriate polyacrylamide flocculant models and concentrations to achieve the best flocculation effect. At present, in actual production, the selection of polyacrylamide flocculants often relies on experience or a large number of experimental explorations, which is not only time-consuming and costly, but also difficult to ensure the accuracy of the selection. Summary of the invention

[0003] Based on the above problems, the present invention provides a method for selecting polyacrylamide flocculants for tailings. The selection method can quickly select polyacrylamide flocculants and concentrations suitable for tailings samples, improve the settling rate of tailings, and reduce production costs.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for selecting a polyacrylamide flocculant for tailings comprises the following steps:

[0006] Step 1: preparing a first polyacrylamide flocculant solution, wherein there are a plurality of first polyacrylamide flocculant solutions, each of which has the same polyacrylamide solute and different polyacrylamide concentrations;

[0007] Step 2: using a plurality of the first polyacrylamide flocculant solutions to perform a first flocculation treatment on tailings slurry samples of the same type of tailings, respectively, testing the first settling velocity corresponding to each of the first polyacrylamide flocculant solutions in the first flocculation treatment, and selecting the polyacrylamide concentration corresponding to the first polyacrylamide flocculant solution with the fastest first settling velocity as the target concentration;

[0008] Step 3: preparing a second polyacrylamide flocculant solution, wherein there are a plurality of second polyacrylamide flocculant solutions, the concentrations of the plurality of second polyacrylamide flocculant solutions are all the target concentration, and the solutes of the plurality of second polyacrylamide flocculant solutions are different types of polyacrylamide flocculants;

[0009] Step 4: using a plurality of the second polyacrylamide flocculant solutions to perform a second flocculation treatment on tailings slurries of different types of tailings, and testing the second settling velocity corresponding to each of the second polyacrylamide flocculant solutions for the different types of tailings in the second flocculation treatment;

[0010] Step 5: For tailings of different types, select the polyacrylamide flocculant with the fastest second settling speed as the target type of polyacrylamide flocculant.

[0011] In some embodiments, the amount of the first polyacrylamide flocculant solution is 5-10.

[0012] In some embodiments, the multiple first polyacrylamide flocculant solutions are arranged from small to large according to the concentration of polyacrylamide solute, and the mass concentration of polyacrylamide in the multiple first polyacrylamide flocculant solutions is distributed in an arithmetic progression according to the mass concentration of polyacrylamide in the first polyacrylamide flocculant solutions.

[0013] In some embodiments, the difference between the mass concentrations of the polyacrylamide in adjacent first polyacrylamide flocculant solutions is 0.1% to 0.4%.

[0014] In some embodiments, the mass concentration of the polyacrylamide in the first polyacrylamide flocculant solution is 0.1%-0.6%.

[0015] In some of the embodiments, the mass concentration of the tailings slurry is 12% to 18%.

[0016] In some embodiments, the first settling velocity testing method comprises the following steps:

[0017] (1) uniformly mixing the first polyacrylamide flocculant solution and the tailings slurry to obtain a first mixed solution;

[0018] (2) dividing the first mixed solution into n equal parts to obtain n first sub-mixed solutions, where n is an integer ≥ 2;

[0019] (3) performing a first standing for each of the plurality of first sub-mixed solutions, wherein the first standing times are t0, t1, ..., t n , wherein t0=0; after the first static setting, the mass of the tailings below the solid-liquid dividing line in each first static setting system is respectively obtained;

[0020] (4) Drawing a first variation curve of the mass of the tailings below the solid-liquid dividing line versus the first standing time, and calculating the first settling velocity based on the first variation curve.

[0021] In some embodiments, t0, t1, ..., t n The time interval is 1min to 2min.

[0022] In some embodiments, the second settling velocity testing method comprises the following steps:

[0023] (1) uniformly mixing the second polyacrylamide flocculant solution and the tailings slurry to obtain a second mixed solution;

[0024] (2) dividing the second mixed solution into N equal parts to obtain N second sub-mixed solutions, where N is an integer ≥ 2;

[0025] (3) performing a second standing of the plurality of the second sub-mixed solutions, wherein the second standing times are T0, T1, ..., T N , wherein T0=0; after the second static setting, the mass of the tailings below the solid-liquid dividing line in each second static setting system is respectively obtained;

[0026] (4) Drawing a second variation curve of the mass of the tailings below the solid-liquid dividing line versus the second standing time, and calculating the second settling velocity based on the second variation curve.

[0027] In some embodiments, T0, T1, ..., T N The time interval is 1min to 2min.

[0028] Beneficial Effects

[0029] The present invention configures polyacrylamide flocculant solutions of different concentrations, uses the flocculant solutions of different concentrations to perform flocculation treatment on the same tailings sample, and selects the target concentration of the polyacrylamide flocculant solution according to the sedimentation rate. Different types of polyacrylamide flocculants are configured into solutions with target concentrations. Different types of polyacrylamide flocculant solutions are used to perform flocculation treatment on different tailings samples. For the tailings sample, the polyacrylamide model corresponding to the polyacrylamide flocculant solution with the fastest sedimentation rate is selected as the target polyacrylamide flocculant. The selection method can quickly select the polyacrylamide flocculant and its concentration suitable for the tailings sample, improve the tailings sedimentation rate, and reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a flowchart of a method for selecting a polyacrylamide flocculant for tailings in one embodiment of the present invention. DETAILED DESCRIPTION

[0031] See also Figure 1One embodiment of the present invention provides a method for selecting a polyacrylamide flocculant for tailings. The method for selecting a polyacrylamide flocculant for tailings comprises the following steps:

[0032] Step 1: preparing a first polyacrylamide flocculant solution, wherein there are a plurality of first polyacrylamide flocculant solutions, each of which has the same polyacrylamide solute and a different polyacrylamide concentration.

[0033] Step 2: Use multiple first polyacrylamide flocculant solutions to perform the first flocculation treatment on the tailings slurry samples of the same type of tailings, test the first sedimentation velocity corresponding to each of the first polyacrylamide flocculant solutions in the first flocculation treatment, and select the polyacrylamide concentration corresponding to the first polyacrylamide flocculant solution with the fastest first sedimentation velocity as the target concentration.

[0034] Step three: preparing a second polyacrylamide flocculant solution, wherein there are a plurality of second polyacrylamide flocculant solutions, the concentrations of the plurality of second polyacrylamide flocculant solutions are all the target concentration, and the solutes of the plurality of second polyacrylamide flocculant solutions are different types of polyacrylamide flocculants.

[0035] Step 4: Use multiple second polyacrylamide flocculant solutions to perform second flocculation treatment on tailings slurries of different types of tailings, and test the second settling velocity corresponding to each of the second polyacrylamide flocculant solutions for the different types of tailings in the second flocculation treatment.

[0036] Step 5: For tailings of different types, select the polyacrylamide flocculant with the fastest second settling speed as the target type of polyacrylamide flocculant.

[0037] In this embodiment, polyacrylamide flocculant solutions of different concentrations are configured, and the same tailings sample is flocculated using the flocculant solutions of different concentrations, and the target concentration of the polyacrylamide flocculant solution is selected according to the sedimentation rate. Different types of polyacrylamide flocculants are configured into solutions with target concentrations. Different types of polyacrylamide flocculant solutions are used to flocculate different tailings samples. For the tailings sample, the polyacrylamide model corresponding to the polyacrylamide flocculant solution with the fastest sedimentation rate is selected as the target polyacrylamide flocculant. This selection method can quickly select the polyacrylamide flocculant and its concentration suitable for the tailings sample, improve the tailings sedimentation rate, and reduce production costs.

[0038] In some embodiments, the amount of the first polyacrylamide flocculant solution is 5-10. The accuracy of the first settling velocity can be improved by a suitable amount of the first polyacrylamide flocculant solution, so that the first settling velocity more accurately reflects the actual flocculation effect between the tailings slurry and the first polyacrylamide flocculant. Optionally, the amount of the first polyacrylamide flocculant solution can be 5, 6, 7, 8, 9, 10, etc.

[0039] In some embodiments, the first polyacrylamide flocculant solutions are arranged from small to large according to the concentration of the polyacrylamide solute, and the mass concentration of the polyacrylamide in the first polyacrylamide flocculant solution is distributed in an arithmetic progression. The mass concentration of polyacrylamide in the first polyacrylamide flocculant solution is distributed in an arithmetic progression, which can more accurately test the first sedimentation velocity, make the first sedimentation velocity closer to the actual flocculation process, and help to further improve the accuracy of polyacrylamide flocculant selection.

[0040] In some embodiments, the difference between the mass concentrations of the polyacrylamide in adjacent first polyacrylamide flocculant solutions is 0.1% to 0.4%. The difference between the mass concentrations of polyacrylamide in adjacent first polyacrylamide flocculant solutions within this range can make the mass concentration gradient of the first polyacrylamide flocculant solution more concentrated, further improving the accuracy of polyacrylamide flocculant selection. Optionally, the difference between the mass concentrations of polyacrylamide in adjacent first polyacrylamide flocculant solutions can be 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, etc. It is understandable that the difference between the mass concentrations of polyacrylamide in adjacent first polyacrylamide flocculant solutions can also be other suitable choices within the range of 0.1% to 0.4%.

[0041] In some embodiments, the mass concentration of the polyacrylamide in the first polyacrylamide flocculant solution is 0.1%-0.6%. The mass concentration of polyacrylamide in the first polyacrylamide flocculant solution can be better adapted to the tailings slurry in this range, so that the polyacrylamide can obtain a better flocculation effect within a smaller mass concentration range. Optionally, the mass concentration of polyacrylamide in the first polyacrylamide flocculant solution can be 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, etc. It is understandable that the mass concentration of polyacrylamide in the first polyacrylamide flocculant solution can also be other suitable choices within the range of 0.1%-0.6%.

[0042] In some embodiments, the mass concentration of the tailings slurry is 12% to 18%. For example, the mass concentration of the tailings slurry can be 12%, 13%, 14%, 15%, 16%, 17%, 18%, etc. It is understandable that the mass concentration of the tailings slurry can also be other suitable selections within the range of 12% to 18%.

[0043] In some of the embodiments, the tailings include iron tailings, copper tailings, lead-zinc tailings, gold tailings, tungsten tailings or manganese tailings.

[0044] In some embodiments, the first settling velocity testing method comprises the following steps:

[0045] (1) The first polyacrylamide flocculant solution and the tailings slurry are uniformly mixed to obtain a first mixed solution.

[0046] (2) Dividing the first mixed solution into n equal parts to obtain n first sub-mixed solutions, where n is an integer ≥2.

[0047] (3) performing a first standing for each of the plurality of first sub-mixed solutions, wherein the first standing times are t0, t1, ..., t n , wherein t0=0; after the first static setting, the mass of the tailings below the solid-liquid dividing line in each first static setting system is obtained respectively.

[0048] (4) Drawing a first variation curve of the mass of the tailings below the solid-liquid dividing line versus the first standing time, and calculating the first settling velocity based on the first variation curve.

[0049] In some embodiments, t0, t1, ..., t n The time interval between them is 1min to 2min. For example, t0, t1, ... t n The time intervals between the two may be 1min, 1.1min, 1.2min, 1.3min, 1.4min, 1.5min, 1.6min, 1.7min, 1.8min, 1.9min, 2min, etc. It is understandable that t0, t1, ..., t n The time interval may also be selected in the range of 1 to 2 minutes.

[0050] In some of these embodiments, n can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, etc. Optionally, n is 8-10.

[0051] In some embodiments, the second settling velocity testing method comprises the following steps:

[0052] (1) uniformly mixing the second polyacrylamide flocculant solution and the tailings slurry to obtain a second mixed solution;

[0053] (2) dividing the second mixed solution into N equal parts to obtain N second sub-mixed solutions, where N is an integer ≥ 2;

[0054] (3) performing a second standing of the plurality of the second sub-mixed solutions, wherein the second standing times are T0, T1, ..., T N , wherein T0=0; after the second static setting, the mass of the tailings below the solid-liquid dividing line in each second static setting system is respectively obtained;

[0055] (4) Drawing a second variation curve of the mass of the tailings below the solid-liquid dividing line versus the second standing time, and calculating the second settling velocity based on the second variation curve.

[0056] In some embodiments, T0, T1, ..., T N The time interval between them is 1min to 2min. For example, T0, T1, ... T N The time intervals between them can be 1min, 1.1min, 1.2min, 1.3min, 1.4min, 1.5min, 1.6min, 1.7min, 1.8min, 1.9min, 2min, etc. It can be understood that T0, T1...T N The time interval may also be selected in the range of 1 to 2 minutes.

[0057] In some of these embodiments, N can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, etc. Optionally, N is 8-10.

[0058] It is understandable that there is a solid-liquid dividing line in the static system after the mixed liquid is allowed to stand, and the tailings content of the part below the solid-liquid dividing line is higher, and the tailings content of the part above the solid-liquid dividing line is lower. When obtaining the quality of the tailings below the solid-liquid dividing line, the liquid above the solid-liquid dividing line can be removed first, and the liquid can be removed in a conventional manner in the art, such as suction, pipetting, etc., which will not be repeated here. After removing the liquid above the solid-liquid dividing line, the part below the solid-liquid dividing line can be filtered, centrifuged, etc., and then dried to obtain the tailings below the solid-liquid dividing line.

[0059] The technical solution of the present invention is described in detail below in conjunction with specific embodiments.

[0060] Example 1

[0061] In this embodiment, the different types of polyacrylamide flocculants are flocculant a, flocculant b, flocculant c, and flocculant d. The tailings are copper tailings A, copper tailings B, and copper tailings C.

[0062] The method for selecting a polyacrylamide flocculant for tailings in this embodiment includes the following steps:

[0063] S101: preparing aqueous solutions of flocculant a with mass concentrations of 0.1%, 0.2%, 0.3%, 0.4%, 0.5% and 0.6%, respectively.

[0064] S102: The first flocculation treatment is performed on the tailings slurry of copper tailings A using the aqueous solution configured in S101, and the first sedimentation velocity corresponding to each aqueous solution in the first flocculation treatment is tested. The mass concentration of the tailings slurry of copper tailings A is 15%. The test of the first sedimentation velocity comprises the following steps: (1) Each aqueous solution is mixed evenly with the tailings slurry to obtain a first mixed solution. (2) The first mixed solution is divided into 10 portions to obtain 10 portions of first sub-mixed solutions. (3) The plurality of first sub-mixed solutions are allowed to stand for 0 min, 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, and 10 min, respectively, and the mass of the tailings below the solid-liquid boundary line in each stationary system is obtained after standing. (4) A first variation curve of the mass of the tailings below the solid-liquid boundary line with the standing time is plotted, and the first sedimentation velocity is calculated based on the first variation curve. The fastest first sedimentation velocity is obtained from the test of the aqueous solution of flocculant a with a mass concentration of 0.4%. 0.4% is taken as the target concentration.

[0065] S103: preparing aqueous solutions of flocculant a, flocculant b, flocculant c and flocculant d with a mass concentration of 0.4% respectively.

[0066] S104: A second flocculation treatment is performed on the tailings slurries of copper tailings A, copper tailings B, and copper tailings C using aqueous solutions of flocculants a, flocculants b, flocculants c, and flocculants d with a mass concentration of 0.4%, and the second sedimentation velocity of each flocculant aqueous solution for copper tailings A, copper tailings B, and copper tailings C in the second flocculation treatment is tested. The test of the second sedimentation velocity includes the following steps: (1) Each aqueous solution is mixed evenly with the tailings slurry to obtain a second mixed solution. (2) The second mixed solution is divided into 10 portions to obtain 10 portions of second sub-mixed solutions. (3) The plurality of portions of the second sub-mixed solutions are allowed to stand for 0 min, 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, and 10 min, respectively, and the mass of the tailings below the solid-liquid boundary line in each stationary system is obtained after standing. (4) A second variation curve of the mass of the tailings below the solid-liquid boundary line versus the standing time is drawn, and the second sedimentation velocity is calculated based on the second variation curve.

[0067] S105: For different types of tailings, the polyacrylamide flocculant with the second fastest settling speed is selected as the target type of polyacrylamide flocculant. The results show that flocculant a has the best flocculation effect for copper tailings A, flocculant b has the best flocculation effect for copper tailings C, and flocculant d has the best flocculation effect for copper tailings B.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0069] For those skilled in the art, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for selecting a polyacrylamide flocculant for tailings, characterized in that: The steps include: Step 1: preparing a first polyacrylamide flocculant solution, wherein there are a plurality of first polyacrylamide flocculant solutions, each of which has the same polyacrylamide solute and different polyacrylamide concentrations; Step 2: using a plurality of the first polyacrylamide flocculant solutions to perform a first flocculation treatment on tailings slurry samples of the same type of tailings, respectively, testing the first settling velocity corresponding to each of the first polyacrylamide flocculant solutions in the first flocculation treatment, and selecting the polyacrylamide concentration corresponding to the first polyacrylamide flocculant solution with the fastest first settling velocity as the target concentration; Step 3: preparing a second polyacrylamide flocculant solution, wherein there are a plurality of second polyacrylamide flocculant solutions, the concentrations of the plurality of second polyacrylamide flocculant solutions are all the target concentration, and the solutes of the plurality of second polyacrylamide flocculant solutions are different types of polyacrylamide flocculants; Step 4: using a plurality of the second polyacrylamide flocculant solutions to perform a second flocculation treatment on tailings slurries of different types of tailings, and testing the second settling velocity corresponding to each of the second polyacrylamide flocculant solutions for the different types of tailings in the second flocculation treatment; Step 5: For tailings of different types, select the polyacrylamide flocculant with the fastest second settling speed as the target type of polyacrylamide flocculant.

2. The method for selecting a polyacrylamide flocculant for tailings according to claim 1, characterized in that: The amount of the first polyacrylamide flocculant solution is 5-10.

3. The method for selecting a polyacrylamide flocculant for tailings according to claim 1, characterized in that: The first polyacrylamide flocculant solutions are arranged from small to large according to the concentration of the polyacrylamide solute. According to the mass concentration of the polyacrylamide in the first polyacrylamide flocculant solution, the mass concentration of the polyacrylamide in the first polyacrylamide flocculant solution is distributed in an arithmetic progression.

4. The method for selecting a polyacrylamide flocculant for tailings according to claim 3, characterized in that: The difference between the mass concentrations of the polyacrylamide in adjacent first polyacrylamide flocculant solutions is 0.1% to 0.4%.

5. The method for selecting a polyacrylamide flocculant for tailings according to claim 1, characterized in that: The mass concentration of the polyacrylamide in the first polyacrylamide flocculant solution is 0.1%-0.6%.

6. The method for selecting a polyacrylamide flocculant for tailings according to any one of claims 1 to 5, characterized in that: The mass concentration of the tailings slurry is 12% to 18%.

7. The method for selecting a polyacrylamide flocculant for tailings according to any one of claims 1 to 5, characterized in that: The test method of the first settling velocity comprises the following steps: (1) uniformly mixing the first polyacrylamide flocculant solution and the tailings slurry to obtain a first mixed solution; (2) dividing the first mixed solution into n equal parts to obtain n first sub-mixed solutions, where n is an integer ≥ 2; (3) performing a first standing for each of the plurality of first sub-mixed solutions, wherein the first standing times are t0, t1, ..., t n , wherein t0=0; after the first static setting, the mass of the tailings below the solid-liquid dividing line in each first static setting system is respectively obtained; (4) Drawing a first variation curve of the mass of the tailings below the solid-liquid dividing line versus the first standing time, and calculating the first settling velocity based on the first variation curve.

8. The method for selecting a polyacrylamide flocculant for tailings according to claim 7, characterized in that: t0, t1, ... t n The time interval is 1min to 2min.

9. The method for selecting a polyacrylamide flocculant for tailings according to any one of claims 1 to 5, characterized in that: The testing method of the second settling velocity comprises the following steps: (1) uniformly mixing the second polyacrylamide flocculant solution and the tailings slurry to obtain a second mixed solution; (2) dividing the second mixed solution into N equal parts to obtain N second sub-mixed solutions, where N is an integer ≥ 2; (3) performing a second standing of the plurality of the second sub-mixed solutions, wherein the second standing times are T0, T1, ..., T N , wherein T0=0; after the second static setting, the mass of the tailings below the solid-liquid dividing line in each second static setting system is respectively obtained; (4) Drawing a second variation curve of the mass of the tailings below the solid-liquid dividing line versus the second standing time, and calculating the second settling velocity based on the second variation curve.

10. The method for selecting a polyacrylamide flocculant for tailings according to claim 9, characterized in that: T0, T1...T N The time interval is 1min to 2min.

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