A process for the flotation recovery of tailings

Abstract

This invention discloses a tailings flotation recovery process, comprising the following steps: mixing circulating water and clean water to form slurries of different concentrations, and measuring the total cyanide content of the slurries at different concentrations; soaking cyanide tailings in sulfuric acid for 60 minutes and adjusting the pH to 4.5; filtering the soaked cyanide tailings in step two to obtain filter cake and filtrate; grinding the filter cake obtained in step three while adding copper sulfate for activation, and adding the slurry from step one for flotation, measuring the pH value, adding sodium hydrogen sulfide to adjust the pH value to 6.5, and stirring for 10 minutes, etc.; This invention relates to the field of tailings flotation technology; by optimizing the ratio of circulating water to clean water, this invention significantly improves the overall efficiency of the tailings flotation recovery process, not only improving the recycling efficiency of water resources and reducing the cost of clean water use, but also achieving efficient recovery of concentrate while reducing the grade of tailings.

Description

Technical Field

[0001] This invention relates to the field of tailings flotation technology, specifically a tailings flotation recovery process. Background Technology

[0002] Currently, flotation is widely used in tailings treatment for the recovery of precious metals and other valuable metals. However, tailings containing cyanide suffer from low concentrate recovery and high tailings grade because cyanide inhibits the use of flotation reagents. Furthermore, the large amount of clean water used in tailings treatment increases water consumption and operating costs. Existing technologies lack effective solutions for optimizing the flotation process through the ratio of circulating water to clean water, especially for improving metal recovery and water utilization in the flotation of cyanide-containing tailings.

[0003] To address the aforementioned issues, how to reduce the inhibitory effect of cyanide on flotation reagents, improve the flotation recovery efficiency of tailings, and at the same time make rational use of circulating water resources and reduce the amount of clean water used have become urgent technical challenges. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a tailings flotation recovery process that solves the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tailings flotation recovery process, comprising the following steps:

[0006] Step 1: Mix circulating water with clean water to form slurries of different concentrations, and measure the total cyanide content of the slurries of different concentrations.

[0007] Step 2: Soak the cyanide tailings in sulfuric acid for 60 minutes and adjust the pH to 4.5;

[0008] Step 3: Filter the cyanide tailings after soaking in Step 2 to obtain filter cake and filtrate;

[0009] Step 4: While grinding the filter cake obtained in Step 3, add copper sulfate to activate it, and add the slurry from Step 1 for flotation. Measure the pH value, add sodium hydrogen sulfide to adjust the pH value to 6.5, stir for 10 minutes, and then add butyl xanthate and an appropriate amount of No. 2 oil for roughing to obtain rough concentrate and primary slurry.

[0010] Step 5: Perform a first scavenging on the primary slurry obtained in Step 4 to obtain scavenged concentrate and secondary slurry;

[0011] Step 6: Perform a second scavenging on the secondary slurry obtained in Step 5 to obtain secondary concentrate and tailings.

[0012] Preferably, the circulating water concentrations in the slurry obtained in step one are 5%, 10%, 25%, and 50%, respectively.

[0013] Preferably, the amount of copper sulfate used in step four is 480 g / t, the grinding time in step four is 10 minutes, the amount of xanthate used in step four is 50 g / t, and the roughing time is 3 minutes.

[0014] Preferably, in step five, during the first scavenging, butyl xanthate and an appropriate amount of No. 2 oil are added, wherein the amount of butyl xanthate is 20g / t, and the scavenging time is 4 minutes.

[0015] Preferably, in step six, during the second sweeping, butyl xanthate and an appropriate amount of No. 2 oil are added, wherein the amount of butyl xanthate is 10g / t, and the sweeping time is 5 minutes.

[0016] Beneficial effects

[0017] This invention provides a tailings flotation recovery process. Compared with existing technologies, it has the following advantages:

[0018] This invention significantly improves the overall efficiency of tailings flotation recovery by optimizing the ratio of circulating water to clean water. Firstly, using a low ratio of circulating water effectively reduces the inhibitory effect of cyanide on flotation reagents, resulting in a significantly higher metal recovery rate, a more stable recovery process, higher metal content in the flotation concentrate, and a markedly lower metal content in the tailings. Furthermore, by rationally utilizing circulating water resources, this invention reduces reliance on clean water, not only improving water resource recycling efficiency and reducing clean water usage costs, but also achieving efficient concentrate recovery while lowering tailings grade.

[0019] During the flotation process, the pH value of the pulp and the dosage of flotation reagents are precisely controlled to ensure that the metal recovery rate reaches the ideal level, further improving the stability and economic efficiency of the flotation system. Especially at lower circulating water ratios, this invention can significantly reduce the metal grade of tailings, keeping the metal content in the tailings below 2 g / t, thereby reducing resource waste. Furthermore, by reducing the amount of clean water used, this invention helps to reduce the total cost of tailings treatment and has a positive impact on environmental protection. Attached Figure Description

[0020] Figure 1 This is a process flow diagram of the present invention;

[0021] Figure 2 This is a flotation data graph of the present invention under different concentrations of circulating water. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1:

[0024] Please see Figure 1 A tailings flotation recovery process includes the following steps:

[0025] Step 1: Mix circulating water with clean water to form slurries of different concentrations, and measure the total cyanide content of the slurries of different concentrations.

[0026] Step 2: Soak the cyanide tailings in sulfuric acid for 60 minutes and adjust the pH to 4.5;

[0027] Step 3: Filter the cyanide tailings after soaking in Step 2 to obtain filter cake and filtrate;

[0028] Step 4: While grinding the filter cake obtained in Step 3, add copper sulfate to activate it, and add the slurry from Step 1 for flotation. Measure the pH value, add sodium hydrogen sulfide to adjust the pH value to 6.5, stir for 10 minutes, and then add butyl xanthate and an appropriate amount of No. 2 oil for roughing to obtain rough concentrate and primary slurry.

[0029] Step 5: Perform a first scavenging on the primary slurry obtained in Step 4 to obtain scavenged concentrate and secondary slurry;

[0030] Step 6: Perform a second scavenging on the secondary slurry obtained in Step 5 to obtain secondary concentrate and tailings.

[0031] The circulating water concentrations in the slurry obtained in step one were 5%, 10%, 25%, and 50%, respectively.

[0032] In step four, the amount of copper sulfate used is 480 g / t, the grinding time in step four is 10 minutes, the amount of xanthate used in step four is 50 g / t, and the roughing time is 3 minutes.

[0033] In step five, during the first scavenging, add butyl xanthate and an appropriate amount of No. 2 oil, with the amount of butyl xanthate being 20g / t and the scavenging time being 4 minutes.

[0034] In step six, during the second scavenging, add butyl xanthate and an appropriate amount of No. 2 oil, with the amount of butyl xanthate being 10g / t and the scavenging time being 5 minutes.

[0035] The results of total cyanide measurement for slurries of different concentrations in step one are shown in Table 1:

[0036] Table 1 Total Cyanide Content of Slurry at Different Concentrations

[0037] Circulating water 5％ 10％ 25％ 50％ 100％ Total cyanide (mg / L) 5 11 24 50 101

[0038] Example 2:

[0039] Please see Figure 1 This embodiment provides a technical solution based on Embodiment 1:

[0040] A tailings flotation recovery process includes the following steps:

[0041] Step 1: Mix the circulating water with clean water to form a slurry with a circulating water concentration of 25%;

[0042] Step 2: Soak the cyanide tailings in sulfuric acid for 60 minutes and adjust the pH to 4.5;

[0043] Step 3: Filter the cyanide tailings after soaking in Step 2 to obtain filter cake and filtrate;

[0044] Step 4: While grinding the filter cake obtained in Step 3, add copper sulfate to activate it, and add the slurry from Step 1 for flotation. Measure the pH value, add sodium hydrogen sulfide to adjust the pH value to 6.5, stir for 10 minutes, and then add butyl xanthate and an appropriate amount of No. 2 oil for roughing to obtain rough concentrate and primary slurry.

[0045] Step 5: Perform a first scavenging on the primary slurry obtained in Step 4 to obtain scavenged concentrate and secondary slurry;

[0046] Step 6: Perform a second scavenging on the secondary slurry obtained in Step 5 to obtain secondary concentrate and tailings.

[0047] In step four, the amount of copper sulfate used is 480 g / t, the grinding time in step four is 10 minutes, the amount of xanthate used in step four is 50 g / t, and the roughing time is 3 minutes.

[0048] In step five, during the first scavenging, add butyl xanthate and an appropriate amount of No. 2 oil, with the amount of butyl xanthate being 20g / t and the scavenging time being 4 minutes.

[0049] In step six, during the second scavenging, add butyl xanthate and an appropriate amount of No. 2 oil, with the amount of butyl xanthate being 10g / t and the scavenging time being 5 minutes.

[0050] The products of each step were measured, and the results are shown in Table 2.

[0051] Table 2. Flotation data under 25% circulating water ratio conditions.

[0052]

[0053] Example 3:

[0054] Please see Figure 1 This embodiment provides a technical solution based on Embodiment 1:

[0055] A tailings flotation recovery process includes the following steps:

[0056] Step 1: Mix the circulating water with clean water to form a slurry with a circulating water concentration of 50%;

[0057] Step 2: Soak the cyanide tailings in sulfuric acid for 60 minutes and adjust the pH to 4.5;

[0058] Step 3: Filter the cyanide tailings after soaking in Step 2 to obtain filter cake and filtrate;

[0059] Step 4: While grinding the filter cake obtained in Step 3, add copper sulfate to activate it, and add the slurry from Step 1 for flotation. Measure the pH value, add sodium hydrogen sulfide to adjust the pH value to 6.5, stir for 10 minutes, and then add butyl xanthate and an appropriate amount of No. 2 oil for roughing to obtain rough concentrate and primary slurry.

[0060] Step 5: Perform a first scavenging on the primary slurry obtained in Step 4 to obtain scavenged concentrate and secondary slurry;

[0061] Step 6: Perform a second scavenging on the secondary slurry obtained in Step 5 to obtain secondary concentrate and tailings.

[0062] In step four, the amount of copper sulfate used is 480 g / t, the grinding time in step four is 10 minutes, the amount of xanthate used in step four is 50 g / t, and the roughing time is 3 minutes.

[0063] In step five, during the first scavenging, add butyl xanthate and an appropriate amount of No. 2 oil, with the amount of butyl xanthate being 20g / t and the scavenging time being 4 minutes.

[0064] In step six, during the second scavenging, add butyl xanthate and an appropriate amount of No. 2 oil, with the amount of butyl xanthate being 10g / t and the scavenging time being 5 minutes.

[0065] The products in each step were measured, and the results are shown in Table 3.

[0066] Table 3. Flotation data under 50% circulating water ratio conditions

[0067]

[0068] Example 4:

[0069] Please see Figure 1This embodiment provides a technical solution based on Embodiment 1:

[0070] A tailings flotation recovery process includes the following steps:

[0071] Step 1: Mix the circulating water with clean water to form a slurry with a circulating water concentration of 10%;

[0072] Step 2: Soak the cyanide tailings in sulfuric acid for 60 minutes and adjust the pH to 4.5;

[0073] Step 3: Filter the cyanide tailings after soaking in Step 2 to obtain filter cake and filtrate;

[0074] Step 4: While grinding the filter cake obtained in Step 3, add copper sulfate to activate it, and add the slurry from Step 1 for flotation. Measure the pH value, add sodium hydrogen sulfide to adjust the pH value to 6.5, stir for 10 minutes, and then add butyl xanthate and an appropriate amount of No. 2 oil for roughing to obtain rough concentrate and primary slurry.

[0075] Step 5: Perform a first scavenging on the primary slurry obtained in Step 4 to obtain scavenged concentrate and secondary slurry;

[0076] Step 6: Perform a second scavenging on the secondary slurry obtained in Step 5 to obtain secondary concentrate and tailings.

[0077] In step four, the amount of copper sulfate used is 480 g / t, the grinding time in step four is 10 minutes, the amount of xanthate used in step four is 50 g / t, and the roughing time is 3 minutes.

[0078] In step five, during the first scavenging, add butyl xanthate and an appropriate amount of No. 2 oil, with the amount of butyl xanthate being 20g / t and the scavenging time being 4 minutes.

[0079] In step six, during the second scavenging, add butyl xanthate and an appropriate amount of No. 2 oil, with the amount of butyl xanthate being 10g / t and the scavenging time being 5 minutes.

[0080] The products in each step were measured, and the results are shown in Table 4.

[0081] Table 4. Flotation data under 10% circulating water ratio conditions

[0082]

[0083]

[0084] Example 5:

[0085] Please see Figure 1 This embodiment provides a technical solution based on Embodiment 1:

[0086] A tailings flotation recovery process includes the following steps:

[0087] Step 1: Mix the circulating water with clean water to form a slurry with a circulating water concentration of 5%;

[0088] Step 2: Soak the cyanide tailings in sulfuric acid for 60 minutes and adjust the pH to 4.5;

[0089] Step 3: Filter the cyanide tailings after soaking in Step 2 to obtain filter cake and filtrate;

[0090] Step 4: While grinding the filter cake obtained in Step 3, add copper sulfate to activate it, and add the slurry from Step 1 for flotation. Measure the pH value, add sodium hydrogen sulfide to adjust the pH value to 6.5, stir for 10 minutes, and then add butyl xanthate and an appropriate amount of No. 2 oil for roughing to obtain rough concentrate and primary slurry.

[0091] Step 5: Perform a first scavenging on the primary slurry obtained in Step 4 to obtain scavenged concentrate and secondary slurry;

[0092] Step 6: Perform a second scavenging on the secondary slurry obtained in Step 5 to obtain secondary concentrate and tailings.

[0093] In step four, the amount of copper sulfate used is 480 g / t, the grinding time in step four is 10 minutes, the amount of xanthate used in step four is 50 g / t, and the roughing time is 3 minutes.

[0094] In step five, during the first scavenging, add butyl xanthate and an appropriate amount of No. 2 oil, with the amount of butyl xanthate being 20g / t and the scavenging time being 4 minutes.

[0095] In step six, during the second scavenging, add butyl xanthate and an appropriate amount of No. 2 oil, with the amount of butyl xanthate being 10g / t and the scavenging time being 5 minutes.

[0096] The products in each step were measured, and the results are shown in Table 5.

[0097] Table 5. Flotation data under 5% circulating water ratio conditions

[0098]

[0099] According to Table 1-5 and Figure 2 We can obtain:

[0100] In this invention, flotation was first conducted using circulating water at concentrations of 25% and 50%. It was found that excessive recycled circulating water samples were used, which inhibited the flotation process due to total cyanide. The tailings grade after flotation was consistently above 3.0 g / t. Therefore, it was decided not to increase the circulating water concentration further, thus reducing the amount of circulating water used. Flotation tests with circulating water concentrations of 5% and 10% showed that after the overall total cyanide content was reduced, under the same test conditions, the flotation tailings were effectively reduced to within 2 g / t. However, the previous imbalance in overall metal content reappeared (similar to previous tests, with a metal content difference of about 20%, which was eliminated by repeated re-testing). The comprehensive charts show that the presence of total cyanide during flotation leads to an imbalance in metal content, making flotation ineffective and resulting in a low concentrate grade and a high tailings grade.

[0101] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0102] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0103] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tailings flotation recovery process, characterized in that, Includes the following steps: Step 1: Mix circulating water with clean water to form slurries of different concentrations, and measure the total cyanide content of the slurries of different concentrations. Step 2: Soak the cyanide tailings in sulfuric acid for 60 minutes and adjust the pH to 4.5; Step 3: Filter the cyanide tailings after soaking in Step 2 to obtain filter cake and filtrate; Step 4: While grinding the filter cake obtained in Step 3, add copper sulfate to activate it, and add the slurry from Step 1 for flotation. Measure the pH value, add sodium hydrogen sulfide to adjust the pH value to 6.5, stir for 10 minutes, and then add butyl xanthate and an appropriate amount of No. 2 oil for roughing to obtain rough concentrate and primary slurry. Step 5: Perform a first scavenging on the primary slurry obtained in Step 4 to obtain scavenged concentrate and secondary slurry; Step Six: Perform a second scavenging on the secondary slurry obtained in Step Five to obtain scavenged concentrate and tailings; The circulating water concentrations in the slurry obtained in step one are 5%, 10%, 25%, and 50%, respectively. In step four, the amount of copper sulfate used is 480 g / t, the grinding time in step four is 10 minutes, the amount of xanthate used in step four is 50 g / t, and the roughing time is 3 minutes. In step five, during the first scavenging, butyl xanthate and an appropriate amount of No. 2 oil are added, with the amount of butyl xanthate being 20g / t and the scavenging time being 4 minutes. In step six, during the second scavenging, butyl xanthate and an appropriate amount of No. 2 oil are added, with the amount of butyl xanthate being 10g / t and the scavenging time being 5 minutes.

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