A combined pH adjustment agent for scheelite flotation and its application method

Abstract

The application discloses a pH combined adjusting agent for scheelite flotation and an application method thereof, and the pH combined adjusting agent comprises the following components and mass fractions: 30% of sodium bicarbonate and 70% of sodium carbonate. The adding method of the pH combined adjusting agent is as follows: sodium bicarbonate is added into ore pulp first, sodium carbonate is added after 1 min of stirring, and then stirring is uniformly carried out. The pH combined adjusting agent can achieve the purposes of strengthening scheelite recovery, improving the scheelite beneficiation recovery rate and reducing production cost.

Description

Technical Field

[0001] This invention relates to the field of scheelite flotation technology, specifically to a pH adjustment agent for scheelite flotation and its application method. Background Technology

[0002] In current scheelite flotation, sodium carbonate is generally used as the pH adjuster, Y1 is used as the gangue depressant, and FX-6, a fatty acid collector, is used as the collector. Because a large amount of calcium hydroxide (quicklime) is added to the scheelite flotation tailings, the pH of the tailings pond return water reaches about 12. This high-pH return water enters the scheelite production process through grinding, causing the pulp pH to reach about 10.5, which is not conducive to scheelite flotation operations and results in a low beneficiation recovery rate. At the same time, the high calcium ion content in the pulp will consume the fatty acid collector in the pulp, generating fatty acid calcium precipitates, resulting in high collector consumption. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a pH adjustment agent for scheelite flotation and its application method. The pH adjustment agent in this invention can enhance the recovery effect of scheelite, improve the recovery rate of scheelite beneficiation, and reduce production costs.

[0004] To achieve the above objectives, the specific solution adopted by the present invention is as follows:

[0005] A pH adjustment agent for scheelite flotation comprises the following components and their mass fractions: 30% sodium bicarbonate and 70% sodium carbonate.

[0006] Furthermore, the specific method for adding the pH combination adjuster is as follows: first add sodium bicarbonate to the slurry, stir for 1 minute, then add sodium carbonate, and stir until uniform.

[0007] Furthermore, the pH of the slurry is 9-11.

[0008] A method for applying a pH adjustment agent for scheelite flotation includes the following steps:

[0009] (1) Processing ultra-low grade scheelite to obtain slurry;

[0010] (2) First, add sodium bicarbonate to the slurry and stir for 1 minute before adding sodium carbonate. Stir until uniform, then add inhibitor and collector in sequence. After one roughing and two scavenging processes, scheelite rough concentrate can be obtained.

[0011] Furthermore, in step (1), the pH of the slurry is 9-11.

[0012] Furthermore, in step (1), the ultra-low grade scheelite is skarn scheelite.

[0013] Beneficial effects:

[0014] 1) Improve mineral processing recovery rate: The sodium bicarbonate in the pH adjustment agent, after hydrolysis, produces... It will react with OH in the slurry - The reaction, namely: Through the above chemical reaction, some of the hydroxide ions in the slurry will be consumed, the pH of the slurry will decrease slightly, and the ions generated in the reaction will also be reduced. It can activate scheelite, disperse sludge, and precipitate harmful metal ions.

[0015] 2) Reduce the cost of mineral processing reagents: For the same mass of sodium bicarbonate... The content is about 15% higher than that of sodium carbonate. After using the pH combination adjuster of the present invention for scheelite flotation, the overall consumption of the adjuster is about 10% lower than that of sodium carbonate alone, and the unit price of sodium bicarbonate is 5%-10% lower than that of sodium carbonate. Attached Figure Description

[0016] Figure 1 This is a flow chart of the scheelite flotation process. Detailed Implementation

[0017] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. 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 protection scope of the present invention.

[0018] A pH adjustment agent for scheelite flotation comprises the following components and their mass fractions: 30% sodium bicarbonate and 70% sodium carbonate.

[0019] For the method of using the above-mentioned pH adjustment agents for scheelite flotation, please refer to [link / reference needed]. Figure 1 Specifically, it includes the following steps:

[0020] (1) The ultra-low grade scheelite is processed to obtain a slurry with a pH of 9-11. The specific processing method is the existing technology and will not be described in detail here.

[0021] (2) First, add sodium bicarbonate (300-400g / ton of raw ore) to the slurry and stir for 1 minute. Then add sodium carbonate (700-900g / ton of raw ore) and stir evenly. Then add inhibitor (0-120g / ton of raw ore) and collector (180-240g / ton of raw ore) in sequence. After the "one roughing and two scavenging" process, scheelite rough concentrate can be obtained. The roughing tailings are discharged into the tailings pond.

[0022] (3) The scheelite rough concentrate adopts a two-stage series thickening process. After thickening by the first stage thickener, the underflow is discharged into the heating tank, and the upper clear liquid overflows to the second stage thickener for secondary flocculation and sedimentation.

[0023] (4) Steam is introduced into the high-concentration (68%) crude concentrate in the heating tank. When the slurry temperature reaches 88°C, water glass (equivalent to 2-3.5 kg / ton of raw ore) is added through the bottom of the heating tank to carry out the de-chemical reaction. The temperature is continued to rise to 92°C and the steam is stopped. Strong stirring is maintained for at least 30 minutes. After the temperature is maintained, the slurry is directly sent to the mixing tank of the beneficiation workshop. After diluting with clean water to 23%-26%, it enters the tungsten beneficiation process. The tungsten beneficiation process adopts the column-machine combined process. After the "one roughing, two cleaning and three scavenging" separation operation, the final scheelite concentrate product is obtained.

[0024] Specifically, the ultra-low grade scheelite is skarn scheelite, and the pH of the slurry is 9-11, preferably 10-11. When using the pH adjustment agent of the present invention, sodium bicarbonate can slightly reduce the pH of the slurry to 9.8-10.2, and the pH between 9.8 and 10.2 is the most favorable flotation environment for skarn scheelite.

[0025] Example 1

[0026] In this embodiment, the pH adjustment agent comprises the following components and their mass fractions: 30% sodium bicarbonate and 70% sodium carbonate. The specific method for adding the pH adjustment agent is as follows: first add sodium bicarbonate to the slurry with a pH of 9, stir for 1 minute, then add sodium carbonate and stir until homogeneous.

[0027] Example 2

[0028] The only difference between Example 2 and Example 1 is that the pH of the slurry is 10.

[0029] Example 3

[0030] The only difference between Example 3 and Example 1 is that the pH of the slurry is 11.

[0031] Comparative Example 1

[0032] The only difference between Comparative Example 1 and Example 1 is that the pH of the slurry is 8.

[0033] Comparative Example 2

[0034] The only difference between Comparative Example 2 and Example 1 is that the pH of the slurry is 12.

[0035] Comparative Example 3

[0036] The only difference between Comparative Example 3 and Example 1 is that the pH adjuster includes 100% sodium carbonate by mass.

[0037] Comparative Example 4

[0038] The only difference between Comparative Example 3 and Example 2 is that the pH adjuster includes 100% sodium carbonate by mass.

[0039] Comparative Example 5

[0040] The only difference between Comparative Example 5 and Example 3 is that the pH adjuster includes 100% sodium carbonate by mass.

[0041] Comparative Example 6

[0042] The only difference between Comparative Example 6 and Example 1 is that the pH combination adjuster includes the following components and their mass fractions: 70% sodium bicarbonate and 30% sodium carbonate.

[0043] Comparative Example 7

[0044] The only difference between Comparative Example 7 and Example 1 is that the pH combination adjuster includes the following components and their mass fractions: 40% sodium bicarbonate and 60% sodium carbonate.

[0045] Comparative Example 8

[0046] The only difference between Comparative Example 8 and Example 1 is that the pH adjuster includes 100% sodium bicarbonate by mass.

[0047] Comparative Example 9

[0048] The only difference between Comparative Example 9 and Example 1 is that the pH combination adjuster is added by adding sodium carbonate and sodium bicarbonate simultaneously and stirring until homogeneous.

[0049] Comparative Example 10

[0050] The only difference between Comparative Example 10 and Example 1 is that the pH combination adjuster is added as follows: sodium carbonate is added first, stirred for 1 minute, and then sodium bicarbonate is added and stirred until homogeneous.

[0051] The total recovery and enrichment ratio of Examples 1-3 and Comparative Examples 1-10 were calculated, and the results are shown in Table 1.

[0052] Table 1. Overall recovery and enrichment ratio of Examples 1-3 and Comparative Examples 1-10

[0053] Total recovery rate / % enrichment ratio Example 1 70.74 5.49 Example 2 69.86 7.75 Example 3 68.53 9.16 Comparative Example 1 53.62 4.98 Comparative Example 2 59.12 10.42 Comparative Example 3 67.97 7.84 Comparative Example 4 65.04 9.17 Comparative Example 5 61.77 10.93 Comparative Example 6 57.71 6.33 Comparative Example 7 57.22 6.93 Comparative Example 8 64.37 5.53 Comparative Example 9 64.81 7.92 Comparative Example 10 69.98 6.45

[0054] Based on the results in Table 1, the following variables were analyzed. (1) Regarding the addition method: Data from Example 1 and Comparative Examples 9-10 show that adding sodium bicarbonate first and then sodium carbonate has a significant advantage over adding them simultaneously, with a recovery rate 5% higher and no significant difference in enrichment ratio; compared with adding sodium carbonate first and then sodium bicarbonate, the recovery rate is 0.86% higher. (2) Regarding the pH of the slurry: As shown in Examples 1-3, Comparative Examples 1 and 2, when the pH of the slurry exceeds the range of 9-11, the recovery rate decreases significantly, indicating that the pH combination adjuster in this invention is significantly suitable for slurries with a pH of 9-11. (3) Regarding the composition of the adjuster: As shown in Examples 1-3 and Comparative Examples 3-7, the composition and proportion of this invention have significant advantages, with a recovery rate of not less than 68.5%.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention in any way. All equivalent transformations or modifications made in accordance with the essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for applying a pH adjustment agent combination in scheelite flotation, characterized in that, The components and their mass fractions in the combined modifier are: sodium bicarbonate 30%, sodium carbonate 70%; The application method of the above-mentioned combination modifiers specifically includes the following steps: (1) The ultra-low grade scheelite was processed to obtain a slurry with a pH of 9-11; (2) First, add sodium bicarbonate to the slurry and stir for 1 minute before adding sodium carbonate. Stir until uniform, then add inhibitor and collector in sequence. After one roughing and two scavenging processes, scheelite rough concentrate can be obtained.

2. The application method of the scheelite flotation pH adjustment agent according to claim 1, characterized in that: In step (1), the ultra-low grade scheelite is skarn scheelite.

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