Tailing flotation recovery process

Abstract

The invention discloses a tailing flotation recovery process which comprises the following steps: mixing circulating water with clear water to form slurry with different concentrations, and measuring the total cyanogen of the slurry with different concentrations; the cyanidation tailings are added into sulfuric acid to be soaked for 60 minutes, and the PH of the cyanidation tailings is adjusted to 4.5; the cyanidation tailings soaked in the second step are filtered, and a filter cake and filtrate are obtained; and 3, grinding the filter cake obtained in the step 3, adding copper sulfate for activation, adding the slurry obtained in the step 1 for flotation, measuring the pH value, adding sodium hydrogen sulfide to adjust the pH value to 6.5, stirring for 10 minutes, and the like. The invention relates to the technical field of tailing flotation. By optimizing the proportion of the circulating water and the clear water, the overall efficiency of the tailing flotation recovery process is remarkably improved, the cyclic utilization efficiency of water resources is improved, the use cost of the clear water is reduced, the grade of the tailings is reduced, and meanwhile efficient recovery of concentrate is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of tailings flotation, in particular to a tailings flotation recovery process. Background Art

[0002] At present, flotation is widely used to recover precious metals and other valuable metals in the tailings treatment process. However, tailings containing cyanide have a low concentrate recovery rate and a high tailings grade due to the inhibitory effect of cyanide on flotation reagents. At the same time, a large amount of clean water is used in the tailings treatment process, which increases the consumption of water resources and operating costs. In the prior art, there is still a lack of effective solutions for optimizing the flotation process by mixing circulating water and clean water, especially for improving the metal recovery rate and water resource utilization rate in the flotation process of cyanide-containing tailings.

[0003] In view of the above problems, how to reduce the inhibitory effect of cyanide on flotation agents, improve the flotation recovery efficiency of tailings, and at the same time rationally utilize circulating water resources and reduce the use of clean water has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a tailings flotation recovery process to solve the above problems.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A tailings flotation recovery process comprises the following steps:

[0006] Step 1: Mix the circulating water with the clean water to form slurries of different concentrations, and measure the total cyanide 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: filtering the cyanide tailings after soaking in step 2 to obtain a filter cake and a filtrate;

[0009] Step 4: grinding the filter cake obtained in step 3 and adding copper sulfate for activation, adding the slurry in step 1 for flotation, measuring the pH value, adding sodium hydrogen sulfide to adjust the pH value to 6.5, stirring for 10 minutes, and then adding butyl xanthate and an appropriate amount of 2# oil for roughing to obtain a coarse concentrate and a primary ore pulp;

[0010] Step 5: The primary ore pulp obtained in step 4 is subjected to a first scavenging to obtain a scavenging concentrate and a secondary ore pulp;

[0011] Step 6: The secondary slurry obtained in step 5 is subjected to a second scavenging to obtain scavenged concentrate and tailings.

[0012] Preferably, the circulating water concentration in the slurry obtained in step 1 is 5%, 10%, 25% and 50% respectively.

[0013] Preferably, the amount of copper sulfate in the step 4 is 480 g / t, the grinding time in the step 4 is 10 minutes, the amount of xanthate in the step 4 is 50 g / t, and the roughing time is 3 minutes.

[0014] Preferably, in the first sweep in step 5, butyrrolidone and an appropriate amount of 2# oil are added, wherein the amount of butyrrolidone is 20 g / t, and the sweep time is 4 minutes.

[0015] Preferably, during the second scavenging in step six, butyrrolidone and an appropriate amount of 2# oil are added, wherein the amount of butyrrolidone is 10 g / t, and the scavenging time is 5 minutes.

[0016] Beneficial Effects

[0017] The present invention provides a tailings flotation recovery process. Compared with the prior art, it has the following beneficial effects:

[0018] The present invention significantly improves the overall efficiency of the tailings flotation recovery process by optimizing the ratio of circulating water to clean water. First, when low-ratio circulating water is used, the inhibitory effect of cyanide on flotation reagents is effectively weakened, so that the metal recovery rate is significantly improved, the recovery process is more stable, the metal content of the flotation concentrate is higher, and the metal content of the tailings is significantly reduced. In addition, the present invention reduces the dependence on clean water by rationally utilizing circulating water resources, which not only improves the recycling efficiency of water resources and reduces the cost of using clean water, but also achieves efficient recovery of concentrate while reducing the grade of tailings.

[0019] During the flotation process, the pH value of the pulp and the amount of flotation reagents are precisely controlled to ensure that the metal recovery rate during the flotation process reaches an ideal level, further improving the stability and economic benefits of the flotation system. In particular, under a lower circulating water ratio, the present invention can significantly reduce the metal grade of the tailings, so that the metal content in the tailings is controlled within 2g / t, thereby reducing resource waste. In addition, by reducing the amount of clean water used, the present invention helps to reduce the total cost of tailings treatment and has a positive effect on environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a process flow chart of the present invention;

[0021] Figure 2 It is a flotation data diagram under different concentrations of circulating water of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1:

[0024] See also Figure 1 , a tailings flotation recovery process, comprising the following steps:

[0025] Step 1: Mix the circulating water with the clean water to form slurries of different concentrations, and measure the total cyanide 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: filtering the cyanide tailings after soaking in step 2 to obtain a filter cake and a filtrate;

[0028] Step 4: grinding the filter cake obtained in step 3 and adding copper sulfate for activation, adding the slurry in step 1 for flotation, measuring the pH value, adding sodium hydrogen sulfide to adjust the pH value to 6.5, stirring for 10 minutes, and then adding butyl xanthate and an appropriate amount of 2# oil for roughing to obtain a coarse concentrate and a primary ore pulp;

[0029] Step 5: The primary ore pulp obtained in step 4 is subjected to a first scavenging to obtain a scavenging concentrate and a secondary ore pulp;

[0030] Step 6: The secondary slurry obtained in step 5 is subjected to a second scavenging to obtain scavenged concentrate and tailings.

[0031] The circulating water concentrations in the slurry obtained in step 1 are 5%, 10%, 25% and 50% respectively.

[0032] The amount of copper sulfate used in step 4 is 480 g / t, the grinding time in step 4 is 10 minutes, the amount of xanthate used in step 4 is 50 g / t, and the roughing time is 3 minutes.

[0033] In step 5, during the first sweep, butyl xanthate and an appropriate amount of 2# oil are added, wherein the amount of butyl xanthate is 20 g / t, and the sweeping time is 4 minutes.

[0034] In step 6, during the second scavenging, butyl xanthate and an appropriate amount of 2# oil are added, wherein the amount of butyl xanthate is 10 g / t, and the scavenging time is 5 minutes.

[0035] The results of total cyanide measurement of slurries of different concentrations in step 1 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] Embodiment 2:

[0039] See also Figure 1 This embodiment provides a technical solution based on the first embodiment:

[0040] A tailings flotation recovery process comprises 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: filtering the cyanide tailings after soaking in step 2 to obtain a filter cake and a filtrate;

[0044] Step 4: grinding the filter cake obtained in step 3 and adding copper sulfate for activation, adding the slurry in step 1 for flotation, measuring the pH value, adding sodium hydrogen sulfide to adjust the pH value to 6.5, stirring for 10 minutes, and then adding butyl xanthate and an appropriate amount of 2# oil for roughing to obtain a coarse concentrate and a primary ore pulp;

[0045] Step 5: The primary ore pulp obtained in step 4 is subjected to a first scavenging to obtain a scavenging concentrate and a secondary ore pulp;

[0046] Step 6: The secondary slurry obtained in step 5 is subjected to a second scavenging to obtain scavenged concentrate and tailings.

[0047] The amount of copper sulfate used in step 4 is 480 g / t, the grinding time in step 4 is 10 minutes, the amount of xanthate used in step 4 is 50 g / t, and the roughing time is 3 minutes.

[0048] In step 5, during the first sweep, butyl xanthate and an appropriate amount of 2# oil are added, wherein the amount of butyl xanthate is 20 g / t, and the sweeping time is 4 minutes.

[0049] In step 6, during the second scavenging, butyl xanthate and an appropriate amount of 2# oil are added, wherein the amount of butyl xanthate is 10 g / t, and the scavenging time is 5 minutes.

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

[0051] Table 2 Flotation data table under the condition of 25% circulating water ratio

[0052]

[0053] Embodiment three:

[0054] See also Figure 1 This embodiment provides a technical solution based on the first embodiment:

[0055] A tailings flotation recovery process comprises 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: filtering the cyanide tailings after soaking in step 2 to obtain a filter cake and a filtrate;

[0059] Step 4: grinding the filter cake obtained in step 3 and adding copper sulfate for activation, adding the slurry in step 1 for flotation, measuring the pH value, adding sodium hydrogen sulfide to adjust the pH value to 6.5, stirring for 10 minutes, and then adding butyl xanthate and an appropriate amount of 2# oil for roughing to obtain a coarse concentrate and a primary ore pulp;

[0060] Step 5: The primary ore pulp obtained in step 4 is subjected to a first scavenging to obtain a scavenging concentrate and a secondary ore pulp;

[0061] Step 6: The secondary slurry obtained in step 5 is subjected to a second scavenging to obtain scavenged concentrate and tailings.

[0062] The amount of copper sulfate used in step 4 is 480 g / t, the grinding time in step 4 is 10 minutes, the amount of xanthate used in step 4 is 50 g / t, and the roughing time is 3 minutes.

[0063] In step 5, during the first sweep, butyl xanthate and an appropriate amount of 2# oil are added, wherein the amount of butyl xanthate is 20 g / t, and the sweeping time is 4 minutes.

[0064] In step 6, during the second scavenging, butyl xanthate and an appropriate amount of 2# oil are added, wherein the amount of butyl xanthate is 10 g / t, and the scavenging time is 5 minutes.

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

[0066] Table 3 Flotation data table under the condition of 50% circulating water ratio

[0067]

[0068] Embodiment 4:

[0069] See also Figure 1This embodiment provides a technical solution based on the first embodiment:

[0070] A tailings flotation recovery process comprises 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: filtering the cyanide tailings after soaking in step 2 to obtain a filter cake and a filtrate;

[0074] Step 4: grinding the filter cake obtained in step 3 and adding copper sulfate for activation, adding the slurry in step 1 for flotation, measuring the pH value, adding sodium hydrogen sulfide to adjust the pH value to 6.5, stirring for 10 minutes, and then adding butyl xanthate and an appropriate amount of 2# oil for roughing to obtain a coarse concentrate and a primary ore pulp;

[0075] Step 5: The primary ore pulp obtained in step 4 is subjected to a first scavenging to obtain a scavenging concentrate and a secondary ore pulp;

[0076] Step 6: The secondary slurry obtained in step 5 is subjected to a second scavenging to obtain scavenged concentrate and tailings.

[0077] The amount of copper sulfate used in step 4 is 480 g / t, the grinding time in step 4 is 10 minutes, the amount of xanthate used in step 4 is 50 g / t, and the roughing time is 3 minutes.

[0078] In step 5, during the first sweep, butyl xanthate and an appropriate amount of 2# oil are added, wherein the amount of butyl xanthate is 20 g / t, and the sweeping time is 4 minutes.

[0079] In step 6, during the second scavenging, butyl xanthate and an appropriate amount of 2# oil are added, wherein the amount of butyl xanthate is 10 g / t, and the scavenging time is 5 minutes.

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

[0081] Table 4 Flotation data table under the condition of 10% circulating water ratio

[0082]

[0083]

[0084] Embodiment five:

[0085] See also Figure 1 This embodiment provides a technical solution based on the first embodiment:

[0086] A tailings flotation recovery process comprises 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: filtering the cyanide tailings after soaking in step 2 to obtain a filter cake and a filtrate;

[0090] Step 4: grinding the filter cake obtained in step 3 and adding copper sulfate for activation, adding the slurry in step 1 for flotation, measuring the pH value, adding sodium hydrogen sulfide to adjust the pH value to 6.5, stirring for 10 minutes, and then adding butyl xanthate and an appropriate amount of 2# oil for roughing to obtain a coarse concentrate and a primary ore pulp;

[0091] Step 5: The primary ore pulp obtained in step 4 is subjected to a first scavenging to obtain a scavenging concentrate and a secondary ore pulp;

[0092] Step 6: The secondary slurry obtained in step 5 is subjected to a second scavenging to obtain scavenged concentrate and tailings.

[0093] The amount of copper sulfate used in step 4 is 480 g / t, the grinding time in step 4 is 10 minutes, the amount of xanthate used in step 4 is 50 g / t, and the roughing time is 3 minutes.

[0094] In step 5, during the first sweep, butyl xanthate and an appropriate amount of 2# oil are added, wherein the amount of butyl xanthate is 20 g / t, and the sweeping time is 4 minutes.

[0095] In step 6, during the second scavenging, butyl xanthate and an appropriate amount of 2# oil are added, wherein the amount of butyl xanthate is 10 g / t, and the scavenging time is 5 minutes.

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

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

[0098]

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

[0100] In the present invention, flotation is first performed using circulating water with a ratio of 25% and 50%. It is found that too much recycled circulating water sample is inhibited by total cyanide during the flotation process, and the tailings grade after flotation is above 3.0 g / t. Therefore, it is considered that the circulating water ratio will not be increased in the future, thereby reducing the circulating water dosage. Through flotation tests with circulating water ratios of 5% and 10%, it can be seen that after the overall reduction of the total cyanide content, under the same test conditions, the flotation tailings are effectively reduced to within 2 g / t, but at the same time, the previous overall metal amount imbalance phenomenon appears (the metal amount differs by about 20% similar to the previous test situation, and the influence of the test error has been eliminated through multiple re-tests); the comprehensive chart shows that after the total cyanide is contained in the flotation process, the metal amount will be unbalanced, and the flotation cannot be effectively separated, resulting in a phenomenon of low concentrate grade and high tailings grade.

[0101] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0102] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

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

Claims

1. A tailings flotation recovery process, characterized in that: The following steps are involved: Step 1: Mix the circulating water with the clean water to form slurries of different concentrations, and measure the total cyanide 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: filtering the cyanide tailings after soaking in step 2 to obtain a filter cake and a filtrate; Step 4: grinding the filter cake obtained in step 3 and adding copper sulfate for activation, adding the slurry in step 1 for flotation, measuring the pH value, adding sodium hydrogen sulfide to adjust the pH value to 6.5, stirring for 10 minutes, and then adding butyl xanthate and an appropriate amount of 2# oil for roughing to obtain a coarse concentrate and a primary ore pulp; Step 5: The primary ore pulp obtained in step 4 is subjected to a first scavenging to obtain a scavenging concentrate and a secondary ore pulp; Step 6: The secondary slurry obtained in step 5 is subjected to a second scavenging to obtain scavenged concentrate and tailings.

2. A tailings flotation recovery process according to claim 1, characterized in that: The circulating water concentrations in the slurry obtained in step 1 are 5%, 10%, 25% and 50% respectively.

3. A tailings flotation recovery process according to claim 1, characterized in that: The amount of copper sulfate used in step 4 is 480 g / t, the grinding time in step 4 is 10 minutes, the amount of xanthate used in step 4 is 50 g / t, and the roughing time is 3 minutes.

4. A tailings flotation recovery process according to claim 1, characterized in that: In the first sweep in step 5, butyrrolidone and an appropriate amount of 2# oil are added, wherein the amount of butyrrolidone is 20 g / t, and the sweeping time is 4 minutes.

5. A tailings flotation recovery process according to claim 1, characterized in that: During the second scavenging in step 6, butyl xanthate and an appropriate amount of 2# oil are added, wherein the amount of butyl xanthate is 10 g / t, and the scavenging time is 5 minutes.

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