A method for adjusting pH value of flotation pulp of high-sulfur copper ore

Abstract

The present invention provides a method for adjusting the pH value of high-sulfur copper ore flotation pulp, and the specific steps include the following: S1: preparing pulp; S2: adjusting pH for the first time and grinding once; S3: adjusting pH for the second time and grinding twice; S4: adjusting pH for the third time and mixing pulp; S5: roughing; S6: adjusting pH for the fourth time and concentrating; S7: scavenging; adding lime milk as an acid-base adjustment reagent before the first grinding, second grinding, roughing and concentrating steps, and adding lime milk four times before and after can reduce the amount of lime under the premise of ensuring the pH environment of copper flotation, and the method can save 11% of the amount of lime; and by adding lime milk reagent before the first grinding and the second grinding, the lime milk reagent can play a role in grinding the pulp, and the particle size of the ground ore can be made more in line with the requirements. The invention solves the problem of how to reduce the amount of lime in the process of adjusting the pH value of the pulp.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing, and in particular to a method for adjusting pH value of flotation pulp of high-sulfur copper ore. Background Art

[0002] The composition of copper ore is generally composed of sulfide, oxide and other minerals. The ore source of our factory is a typical high-sulfur copper ore. During the processing of high-sulfur copper ore, the pH value of the slurry needs to be adjusted. Lime is used as both a medium pH adjuster and a sulfur ore inhibitor. The addition of lime is particularly important for the entire mineral processing system. The traditional method of adding lime is to add lime in the grinding and copper stirring tanks respectively, which will cause the following problems:

[0003] 1. The amount added is too little, the pH value in the slurry is too low, and the copper quality is low;

[0004] 2. If the amount of lime is excessive, it will not only reduce the copper recovery rate, but also make the subsequent activation of sulfur minerals extremely difficult;

[0005] 3. The total amount of lime added is sufficient, but copper selection shows that the pH value of the slurry is insufficient and the sulfur minerals cannot be suppressed. Summary of the invention

[0006] In view of the above problems, the present invention provides a method for adjusting the pH value of high-sulfur copper ore flotation slurry, which solves the problem of how to reduce the amount of lime used in the process of adjusting the pH value of the slurry.

[0007] To solve the above problems, the technical solution adopted by the present invention is:

[0008] A method for adjusting pH value of flotation pulp of high-sulfur copper ore, S1: preparing pulp: preparing primary pulp by mixing copper sulfide ore and water in a mass ratio of 1:2.5, and conveying the obtained primary pulp to a primary grinding device through a conveying device for grinding;

[0009] S2: First pH adjustment and primary grinding: The pH adjustment reagent in the storage tank is transported to the primary grinding device through the first delivery pipeline to be mixed with the primary slurry to obtain a secondary slurry; the secondary slurry is ground once by the primary grinding device to obtain a tertiary slurry;

[0010] S3: Second PH adjustment and secondary grinding: The PH adjustment reagent in the storage tank is transported to the tertiary slurry through the second transport pipeline, and the PH adjustment reagent is mixed with the tertiary slurry to obtain a quaternary slurry; the obtained quaternary slurry is added to the secondary grinding equipment for re-grinding to obtain a quintic slurry, and the obtained quintic slurry is placed in a stirring barrel;

[0011] S4: PH third adjustment and mixed slurry: the PH adjustment reagent in the storage tank is transported to the above-mentioned mixing barrel through the third transport pipeline; the fifth slurry and the PH adjustment reagent in the mixing barrel are stirred by a stirring device, so that the fifth slurry and the PH adjustment reagent added in the above-mentioned PH third adjustment are fully mixed to obtain the sixth slurry;

[0012] S5: Roughing: Add the 6th ore pulp into the flotation equipment, and add the capture agent to adjust the pulp when the pH value of the 6th ore pulp is not less than 8.6. After the pulp adjustment, perform roughing operation to obtain coarse concentrate and tailings;

[0013] S6: PH fourth adjustment and beneficiation: The PH adjustment reagent in the storage box is transported to the coarse concentrate through the fourth delivery pipeline to be mixed with the coarse concentrate to obtain the seventh ore pulp, wherein the PH value of the seventh ore pulp is detected to be not less than 11.5, and then the adjustment agent is added to the seventh ore pulp for slurry adjustment and then beneficiation I operation is performed;

[0014] S7: Scavenging: adding a capture agent to the tailings obtained from the roughing to prepare the slurry and then carrying out scavenging I operation;

[0015] By adopting the above scheme, the acid-base adjusting reagent lime milk is added before the primary grinding, secondary grinding, roughing and cleaning steps. The four additions of lime milk can reduce the amount of lime while ensuring the pH environment of copper flotation. In addition, by adding lime milk reagent before the primary grinding and secondary grinding, the lime milk reagent can play a grinding aid role on the ore pulp, so that the particle size of the ground ore can be more in line with the requirements.

[0016] Preferably, the pH adjusting agent is lime milk. Lime can react with water to form calcium hydroxide, wherein calcium hydroxide is a strong alkaline, which can increase the concentration of hydroxide ions in the slurry, thereby adjusting the pH value of the slurry solution, and can quickly and effectively achieve the adjustment process.

[0017] Preferably, a filter plate is provided inside the storage box, and a plurality of filter holes are provided on the surface of the filter plate. A feed pipe communicating therewith is fixedly connected to the lower end of the storage box. The ends of the first conveying pipe and the second conveying pipe extend into the storage box and are located below the filter plate, and the ends of the third conveying pipe and the fourth conveying pipe extend into the storage box and are located above the filter plate. The lime milk solution conveyed by the first conveying pipe and the second conveying pipe enters the primary grinding device and the secondary grinding device, and the larger lime particles can enter the primary grinding device and the secondary grinding device. The larger lime particles can be ground by the grinding device, thereby improving the utilization efficiency of the lime. Moreover, the larger lime particles can enter the primary grinding device and the secondary grinding device, which can play a role of aiding grinding, thereby improving the grinding effect of the grinding device on the slurry and improving the grinding efficiency.

[0018] Preferably, the primary grinding in step S2 is performed by a semi-autogenous mill, and the secondary slurry is ground by the semi-autogenous mill to obtain a tertiary slurry, in which 55% by mass of the original ore particle size is less than 200 mesh; the secondary grinding in step S3 is performed by a ball mill, and the fourth slurry is ground by the ball mill to obtain a fifth slurry, in which 72% by mass of the original ore particle size is less than 200 mesh.

[0019] Preferably, the pH value of the secondary slurry obtained after the first pH adjustment in the above step S2 is not less than 7.2; the pH value of the quaternary slurry obtained after the second pH adjustment in the above step S3 is not less than 7.8.

[0020] Preferably, the stirring device in the above step S4 is a vertical stirring device, and the pH adjustment reagent in the third delivery pipeline is added into the stirring barrel from the top for stirring.

[0021] Preferably, a distributor is provided in each of the first delivery pipeline, the second delivery pipeline, the third delivery pipeline and the fourth delivery pipeline, and the distributor is a flow control valve.

[0022] Preferably, in the above step S6, a primary concentrate and a primary concentrate tailings are obtained through the selection I, the primary concentrate tailings obtained through the selection I operation are added back into the roughing operation, the primary concentrate obtained through the selection I operation is subjected to the selection II operation, the selection II operation obtains a secondary concentrate and a secondary concentrate tailings, the secondary concentrate tailings obtained through the selection II operation are added back into the selection I operation, and the secondary concentrate obtained through the selection II operation is the copper concentrate.

[0023] Preferably, in the above step S7, a primary sweep concentrate and a primary sweep tailings are obtained after sweeping operation I, the primary sweep tailings obtained from sweeping operation I are added back to the roughing operation, the primary sweep concentrate obtained from sweeping operation I is subjected to sweeping operation II, the sweeping operation II obtains a secondary sweep concentrate and a secondary sweep tailings, the secondary sweep tailings obtained from sweeping operation II are added to sweeping operation I for operation, and the secondary sweep concentrate obtained from sweeping operation II is the copper tailings.

[0024] The beneficial effects of the present invention are:

[0025] Compared with the prior art, by adopting the above scheme, lime milk, an acid-base adjusting reagent, is added before the primary grinding, secondary grinding, roughing and concentrating steps. The lime milk is added four times before and after, and the amount of lime used can be reduced under the premise of ensuring the pH environment of copper flotation. The method can save 11% of the amount of lime used; and the pulp can be fully and effectively ground by adopting the primary grinding and secondary grinding, and the lime milk reagent is added before the primary grinding and the secondary grinding respectively, so that the pulp can be aided in grinding by the lime milk reagent, so that the particle size of the ground ore can be more in line with the requirements, the copper grade and recovery rate can be optimized, and the maximum recovery of copper can be ensured; and the lime milk reagent at the bottom of the storage box is added into the primary grinding equipment and the secondary grinding equipment for grinding, so that the larger particles in the lime milk can be ground, the use efficiency of the lime milk reagent can be improved, and the amount of lime milk can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Reference Figure 1 A method for adjusting the pH value of high-sulfur copper ore flotation pulp, the first step: preparing the pulp; preparing the copper sulfide ore and water in a mass ratio of 1:2.5 to form a primary pulp, conveying the obtained primary pulp to a primary grinding device through a conveying device for preparation of grinding, grinding the pulp through the primary grinding device, grinding it to a predetermined size, and ensuring the subsequent copper flotation processing process.

[0029] Step 2: The first pH adjustment and the first grinding; the pH adjustment reagent in the storage box is transported to the first grinding equipment through the first conveying pipeline to mix with the primary slurry to obtain the secondary slurry; the secondary slurry is ground once by the primary grinding equipment to obtain the tertiary slurry, and the tertiary slurry obtained by grinding the secondary slurry is completed until 55% of the mass percentage of the original ore particle size is less than 200 mesh.

[0030] Step 3: PH adjustment for the second time and secondary grinding; the PH adjustment reagent in the storage box is transported to the tertiary slurry through the second conveying pipeline, and the PH adjustment reagent is mixed with the tertiary slurry to obtain the quaternary slurry; the obtained quaternary slurry is added to the secondary grinding equipment for re-grinding to obtain the quintic slurry, and the quintic slurry obtained by grinding the quaternary slurry is until 72% of the mass percentage of the original ore particle size is less than 200 mesh, and the obtained quintic slurry is placed in a stirring barrel, and the slurry in the stirring barrel is fully mixed to ensure its uniformity.

[0031] Step 4: PH third adjustment and mixing of slurry; delivering the PH adjustment reagent in the storage box to the mixing barrel through the third delivery pipe; stirring the fifth slurry and the PH adjustment reagent in the mixing barrel by the stirring equipment, so that the fifth slurry and the PH adjustment reagent added by the third PH adjustment are fully mixed to obtain the sixth slurry, wherein the PH value of the sixth slurry is tested by the PH detection equipment until the predetermined PH environmental requirements are met.

[0032] Step 5: Roughing: Add the sixth ore pulp into the flotation equipment, and add the capture agent to adjust the pulp when the pH value of the sixth ore pulp is not less than 8.6. After the pulping is completed, roughing operation is carried out to obtain coarse concentrate and tailings.

[0033] Step 6: PH adjustment and selection for the fourth time; the PH adjustment reagent in the storage box is transported to the coarse concentrate through the fourth conveying pipeline to mix with it to obtain the seventh slurry, wherein the PH value of the seventh slurry is detected to be not less than 11.5, and then the adjustment agent is added to the seventh slurry for slurry adjustment and then the selection I operation is carried out. The PH value of the coarse concentrate is adjusted by the PH adjustment reagent, thereby ensuring that the PH value is in a suitable environment, which can ensure the benefit and efficiency of copper selection.

[0034] Step 7: scavenging; adding a capture agent to the tailings obtained from the roughing to prepare the slurry and then carrying out scavenging I operation. After the scavenging operation, the copper ore in the tailings can be fully utilized to ensure the efficiency of copper flotation production.

[0035] It should be noted here that the above-mentioned adjusting agent is used to adjust the pH value. When the pH value is too high or too low, the slurry can be fine-tuned. The above-mentioned is an existing reagent and does not involve improvement, so it will not be described in detail here.

[0036] The pH adjustment reagent is lime milk. Lime can react with water to form calcium hydroxide. Calcium hydroxide is a strong alkaline, which can increase the concentration of hydroxide ions in the slurry, thereby adjusting the pH value of the slurry solution. The adjustment process can be achieved quickly and effectively. Limestone is easy to obtain and has a high cost-effectiveness, which can reduce production costs.

[0037] A filter plate is provided inside the storage box, and a plurality of filter holes are provided on the surface of the filter plate. A feed pipe communicating with the feed pipe is fixedly connected to the lower end of the storage box. The ends of the first delivery pipe and the second delivery pipe extend into the storage box and are located below the filter plate. The ends of the third delivery pipe and the fourth delivery pipe extend into the storage box and are located above the filter plate. The lime milk solution is input into the storage box from the lower end, wherein a filter plate is provided in the storage box, and the large-sized lime milk particles that are not completely dissolved are isolated at the bottom of the storage box by the filter plate, and the lime milk solution that meets the size requirements is located above the filter plate of the storage box; the lime milk solution delivered by the first delivery pipe and the second delivery pipe enters the primary grinding Inside the grinding equipment and the secondary grinding equipment, the larger lime particles can enter the primary grinding equipment and the secondary grinding equipment, and the larger lime particles can be ground by the grinding equipment, which can improve the utilization efficiency of the lime; and the larger lime particles can enter the primary grinding equipment and the secondary grinding equipment, which can play a role in aiding grinding, and can improve the grinding effect of the grinding equipment on the slurry and improve the grinding efficiency; lime milk reagent is added during the primary grinding and the secondary grinding, and the pH value of the slurry can be adjusted twice while grinding, which can extend the mixing time of the lime milk solution and the slurry, and can more effectively adjust the pH value of the slurry.

[0038] The first grinding in the second step is ground by a semi-autogenous mill, and the second slurry is ground by a semi-autogenous mill to obtain a tertiary slurry, of which 55% by mass of the original ore particle size is less than 200 mesh. The first slurry is ground by a semi-autogenous mill, and the size of the slurry obtained after grinding is tested. If it meets the requirements, the obtained tertiary slurry is subjected to secondary grinding; the secondary grinding in the third step is ground by a ball mill, and the fourth slurry is ground by a ball mill to obtain a fifth slurry, of which 72% by mass of the original ore particle size is less than 200 mesh, and the slurry is ground by a ball mill. The four ore pulps with adjusted pH are ground to obtain five ore pulps, which are tested and placed in subsequent mixing barrels if they meet the requirements. The above-mentioned raw ore particles are smaller than 200 meshes, that is, the raw ore particle size is smaller than 74 microns. The ore pulp is ground twice by a semi-autogenous mill and a ball mill to ensure the size of the raw ore particles in the ore pulp. In addition, lime milk is added to adjust the pH value during the two grinding processes, so that the pH value of the ore pulp can be initially adjusted while grinding, thereby improving the effect of lime milk on pH adjustment.

[0039] The pH value of the secondary slurry obtained after the first pH adjustment in the second step is not less than 7.2; the pH value of the fourth slurry obtained after the second pH adjustment in the third step is not less than 7.8, and the pH value of the sixth slurry in the fifth step is not less than 8.6, and the pH value of the seventh slurry in the sixth step is not less than 11.5. The lime milk added in the second and third steps can make a preliminary adjustment to the pH, avoiding the need to add excessive lime milk reagent at one time in subsequent steps, reducing the subsequent stirring time, allowing the slurry solution to quickly reach a predetermined pH value, and improving the processing efficiency; adjusting the pH value in the fifth and sixth steps to a predetermined value can ensure normal flotation of the high-sulfur copper slurry and ensure the number and quality of the flotation tubes.

[0040] The stirring equipment in the fourth step is a vertical stirring equipment. The PH adjusting reagent in the third conveying pipeline is added from the top into the stirring barrel for stirring. The PH adjusting reagent can be fully mixed with the slurry under the action of the stirring equipment, thereby improving the mixing effect of the PH reagent and the slurry, and ensuring that the slurry can be subjected to subsequent flotation processing in a suitable PH environment.

[0041] The first conveying pipeline, the second conveying pipeline, the third conveying pipeline and the fourth conveying pipeline are all provided with a distributor, which is a flow control valve. The flow rate and flow velocity of the lime milk are controlled by the flow control valve in the first conveying pipeline, the second conveying pipeline, the third conveying pipeline and the fourth conveying pipeline. Different conveying pipelines are adjusted according to different slurry solutions and the pH values ​​obtained by detection. By controlling the flow rate of the lime milk, the pH value of the entire slurry solution is adjusted to achieve precise automatic control and ensure the flotation quality and flotation efficiency of the flotation slurry.

[0042] In the sixth step, a primary concentrate and a primary concentrate tailings are obtained through selection I, and the primary concentrate tailings obtained from the selection I operation are added back to the roughing operation. The concentrate tailings obtained from the selection I are added back to the roughing operation, which can improve the utilization efficiency of the concentrate tailings, improve the conversion rate of copper produced by copper flotation, and increase the output; the primary concentrate obtained from the selection I operation is subjected to selection II operation, and a secondary concentrate and a secondary concentrate tailings are obtained from the selection II operation. The secondary concentrate tailings obtained from the selection II operation are added to the selection I for re-operation, and the secondary concentrate obtained from the selection II operation is the copper concentrate. The secondary concentrate tailings have a high copper content, and only need to be added to the selection I for re-operation, which can ensure the copper output while improving the production efficiency; the secondary concentrate obtained from the selection II is the final finished product, and the secondary concentrate can be subsequently dried and processed.

[0043] In the seventh step, after the scavenging I operation, a primary scavenging concentrate and a primary scavenging tailings are obtained. The primary scavenging tailings obtained from the scavenging I operation are added back to the roughing operation, and the primary scavenging concentrate obtained from the scavenging I operation is subjected to the scavenging II operation. The scavenging II operation obtains a secondary scavenging concentrate and a secondary scavenging tailings. The secondary scavenging tailings obtained from the scavenging II operation are added to the scavenging I operation. The secondary scavenging concentrate obtained from the scavenging II operation is the copper tailings. After two scavenging operations, the tailings obtained in the fifth step can be deeply processed to fully extract the copper ore resources in the copper tailings. The two scavenging operations can ensure the flotation production efficiency while ensuring the quality of production.

[0044] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for adjusting the pH value of flotation pulp of high-sulfur copper ore, characterized in that: The specific steps include the following: S1: preparing ore pulp: preparing primary ore pulp by mixing copper sulfide ore and water in a mass ratio of 1:2.5, and conveying the obtained primary ore pulp to a primary grinding device through a conveying device for grinding; S2: pH adjustment for the first time and primary grinding: the pH adjustment reagent in the storage tank is transported to the primary grinding device through the first delivery pipeline to be mixed with the primary slurry to obtain secondary slurry; the secondary slurry is ground once by the primary grinding device to obtain tertiary slurry; S3: pH adjustment for the second time and secondary grinding: The pH adjustment reagent in the storage tank is transported to the tertiary slurry through the second delivery pipeline, and the pH adjustment reagent is mixed with the tertiary slurry to obtain a quaternary slurry; the obtained quaternary slurry is added to the secondary grinding equipment for re-grinding to obtain a quintic slurry, and the obtained quintic slurry is placed in a stirring barrel; S4: pH adjustment for the third time and mixing the slurry: the pH adjustment reagent in the storage tank is transported to the stirring barrel through the third transport pipeline; the fifth slurry and the pH adjustment reagent in the stirring barrel are stirred by a stirring device so that the fifth slurry and the pH adjustment reagent added in the third pH adjustment are fully mixed to obtain the sixth slurry; S5: Roughing: Add the 6th ore pulp into the flotation equipment, and add the capture agent to adjust the pulp when the pH value of the 6th ore pulp is not less than 8.

6. After the pulp adjustment, perform roughing operation to obtain coarse concentrate and tailings; S6: pH fourth adjustment and beneficiation: The pH adjustment reagent in the storage tank is transported to the coarse concentrate through the fourth transport pipeline to be mixed with the coarse concentrate to obtain a seventh ore pulp, wherein the pH value of the seventh ore pulp is detected to be not less than 11.5, and then the pH adjustment agent is added to the seventh ore pulp for slurry adjustment and then beneficiation I operation is performed; S7: Scavenging: adding a capture agent to the tailings obtained from the roughing to prepare the slurry and then carrying out scavenging I operation; The pH value of the secondary slurry obtained after the first pH adjustment in the above step S2 is not less than 7.2; the pH value of the quaternary slurry obtained after the second pH adjustment in the above step S3 is not less than 7.

8.

2. The method for adjusting pH value of flotation pulp of high-sulfur copper ore according to claim 1, characterized in that: The pH adjusting agent is lime milk.

3. The method for adjusting pH value of flotation pulp of high-sulfur copper ore according to claim 2, characterized in that: A filter plate is provided inside the storage box, and a plurality of filter holes are opened on the surface of the filter plate. A feed pipe communicating with the storage box is fixedly connected to the lower end of the storage box. The ends of the first conveying pipe and the second conveying pipe extend into the storage box and are located below the filter plate. The ends of the third conveying pipe and the fourth conveying pipe extend into the storage box and are located above the filter plate.

4. The method for adjusting pH value of flotation pulp of high-sulfur copper ore according to claim 1, characterized in that: The primary grinding in step S2 is performed by a semi-autogenous mill, and the secondary slurry is ground by the semi-autogenous mill to obtain a tertiary slurry, in which 55% by mass of the original ore particle size is less than 200 mesh; the secondary grinding in step S3 is performed by a ball mill, and the quartet slurry is ground by the ball mill to obtain a quintet slurry, in which 72% by mass of the original ore particle size is less than 200 mesh.

5. The method for adjusting pH value of flotation pulp of high-sulfur copper ore according to claim 1, characterized in that: The stirring device in the above step S4 is a vertical stirring device, and the pH adjustment reagent in the third delivery pipeline is added into the stirring barrel from the top for stirring.

6. The method for adjusting pH value of flotation pulp of high-sulfur copper ore according to claim 1, characterized in that: The first delivery pipeline, the second delivery pipeline, the third delivery pipeline and the fourth delivery pipeline are all provided with a distributor, and the distributor is a flow control valve.

7. A method for adjusting pH value of flotation pulp of high-sulfur copper ore according to any one of claims 1 to 6, characterized in that: In the above step S6, a primary concentrate and a primary concentrate tailings are obtained through the selection I, and the primary concentrate tailings obtained from the selection I operation are added back to the roughing operation, and the primary concentrate obtained from the selection I operation is subjected to the selection II operation, and the selection II operation obtains a secondary concentrate and a secondary concentrate tailings, and the secondary concentrate tailings obtained from the selection II operation are added back to the selection I operation, and the secondary concentrate obtained from the selection II operation is the copper concentrate.

8. A method for adjusting pH value of flotation pulp of high-sulfur copper ore according to any one of claims 1 to 6, characterized in that: In the above step S7, after the scavenging I operation, a primary scavenging concentrate and a primary scavenging tailings are obtained. The primary scavenging tailings obtained by the scavenging I operation are added back to the roughing operation. The primary scavenging concentrate obtained by the scavenging I operation is subjected to scavenging II operation. The scavenging II operation obtains a secondary scavenging concentrate and a secondary scavenging tailings. The secondary scavenging tailings obtained by the scavenging II operation are added to the scavenging I operation. The secondary scavenging concentrate obtained by the scavenging II operation is the copper tailings.

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