Combined activating agent suitable for reverse flotation of phosphorite and application of combined activating agent

Abstract

The invention discloses a combined activating agent suitable for phosphorite reverse flotation and application of the combined activating agent, and belongs to the technical field of phosphorite flotation. The combined activating agent comprises acid red 27 and propionic acid, the combined activating agent can generate a strong activation effect on dolomite within the pH range of 3-7, meanwhile, apatite flotation is not promoted, and therefore flotation separation of dolomite and apatite is achieved. The mass percent of the acid red 27 in the combined activating agent is 30%-60%, the dosage of the combined activating agent is 500-1000g / t, the reaction time of the combined activating agent and phosphorite pulp is 3-15 minutes, after the combined activating agent is activated, a hydroximic acid and butanol mixed collecting agent is used for flotation, meanwhile, a No.2 oil foaming agent is added, and the flotation time is 3-15 minutes. Phosphorus concentrate with the P2O5 grade of 27.81%-28.75% and the recovery rate of 85.33%-90.18% can be obtained through the reverse flotation closed-loop process of one-time roughing and one-time concentration.

Description

Technical Field

[0001] The invention relates to a combined activator suitable for reverse flotation of phosphate rock and application thereof, belonging to the technical field of phosphate rock flotation. Background Art

[0002] With the increasing depletion of high-grade phosphate rock worldwide, the grade of selected raw ore has declined year by year, and medium- and low-grade phosphate rock (especially high-magnesium collophosphate) has gradually become the main focus of development. However, existing phosphate rock reverse flotation processes face problems such as incomplete magnesium removal and excessive magnesium oxide content in the concentrate, which seriously restricts the efficient utilization of phosphorus resources. Medium- and low-grade phosphate rock is often associated with a large amount of magnesian minerals (such as dolomite and calcite), whose surface chemical properties are highly similar to those of phosphate minerals. This leads to insufficient selectivity in traditional flotation reagents, making it difficult to accurately separate the target mineral from impurities. In particular, there is a lack of activators to improve the flotation effect of calcareous gangue in acidic conditions and enhance separation efficiency. Therefore, screening for efficient dolomite and calcite activators has become an urgent need for companies. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention provides a combined activator suitable for reverse flotation of phosphate rock, wherein the combined activator comprises Acid Red 27 and propionic acid.

[0004] Preferably, the mass percentage of Acid Red 27 in the combined activator is 30% to 60%, and the mass percentage of propionic acid is 40% to 70%, wherein the total mass percentage of Acid Red 27 and propionic acid is 100%.

[0005] Preferably, the combined activator is used in a slurry with a pH range of 3 to 7.

[0006] Preferably, the molecular formula of Acid Red 27 is as shown in Formula I:

[0007]

[0008] Application of the combined activator of the present invention in reverse flotation of phosphate concentrate from phosphate ore.

[0009] Preferably, the application method is: reverse flotation through a "one coarse and one fine" process.

[0010] Preferably, the amount of the combined activator used in the coarse selection is 0.4-0.6 kg / t; and the amount of the combined activator used in the fine selection is 0.2-0.3 kg / t.

[0011] Principle of the invention: The three SO3 groups of Acid Red 27 can react with calcium ions on the surface of dolomite to form a planar adsorption structure. At the same time, propionic acid can react with calcium ions on the surface of dolomite, so that the two agents can be co-adsorbed on the dolomite surface, thereby fully improving the hydrophobicity of the dolomite surface.

[0012] Technical effects of the present invention:

[0013] (1) The present invention provides a new combination activator, the use of which can reduce the amount of collector used in the flotation process.

[0014] (2) The present invention is beneficial to the enrichment of P2O5 and the removal of dolomite during the flotation process of phosphate rock.

[0015] (3) The present invention can produce a strong activation effect on dolomite within the pH range of 3 to 7. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the process flow chart of "one coarse and one fine". DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and specific examples, but the scope of protection of the present invention is not limited to the contents described above. Unless otherwise specified, all reagents used are conventional commercially available reagents. The mixed collector used in the examples is composed of hydroxamic acid and butanol, wherein the mass percentage of butanol is 35% and the mass percentage of hydroxamic acid is 65%.

[0018] Example 1

[0019] An application of a combined activator suitable for reverse flotation of phosphate rock. In this embodiment, the combined activator comprises 30% by mass of Acid Red 27 and 70% by mass of propionic acid, wherein the total mass percentage of Acid Red 27 and propionic acid is 100%. The specific reverse flotation steps are as follows:

[0020] The reverse flotation temperature is 15℃, the grinding fineness is -0.074mm, the mass fraction is 85%, and the method is as follows: Figure 1 The "one coarse and one fine" reverse flotation closed-circuit process shown in FIG2 is as follows: 12 kg / t of sulfuric acid is added to the rougher, stirred for 4 minutes, 1 kg / t of a mixed collector of hydroxamic acid and butanol is added (the mass percentage of butanol in the mixed collector is 35%, and the mass percentage of hydroxamic acid is 65%), stirred for 3 minutes, 0.5 kg / t of a combined activator is added, stirred for 5 minutes, 38 g / t of No. 2 oil is added, and stirred for 1 minute; 6 kg / t of sulfuric acid is added to the finer, stirred for 4 minutes, 1.5 g / t of a mixed collector of hydroxamic acid and butanol is added (the mass percentage of butanol in the mixed collector is 35%, and the mass percentage of hydroxamic acid is 65%), stirred for 3 minutes, 0.25 kg / t of a combined activator is added, stirred for 2 minutes, 19 g / t of No. 2 oil is added, and stirred for 1 minute, ultimately obtaining phosphate concentrate and phosphate tailings, while the finer tailings are returned to the rougher.

[0021] The results are shown in Table 1. The grade of P2O5 in the concentrate is 28.59%, and the grade of MgO in the concentrate is 0.48%.

[0022] Example 2

[0023] An application of a combined activator suitable for reverse flotation of phosphate rock. In this embodiment, the combined activator comprises 60% by mass of Acid Red 27 and 40% by mass of propionic acid, wherein the total mass percentage of Acid Red 27 and propionic acid is 100%. The specific flotation steps are as follows:

[0024] When the reverse flotation temperature is 15℃, the grinding fineness is -0.074mm, and the mass fraction is 85%, the following is adopted: Figure 1 The "one coarse and one fine" reverse flotation closed-circuit process shown in the figure is as follows: 18 kg / t of sulfuric acid is added to the rougher, stirred for 4 minutes, 1 kg / t of a mixed collector of hydroxamic acid and butanol is added, stirred for 3 minutes, 0.6 kg / t of a combined activator is added, stirred for 10 minutes, 38 g / t of No. 2 oil is added, and stirred for 1 minute; 7.5 kg / t of sulfuric acid is added to the finer, stirred for 4 minutes, 1.5 g / t of a mixed collector of fatty hydroxamic acid and butanol is added, stirred for 3 minutes, 0.2 kg / t of a combined activator is added, stirred for 2 minutes, 19 g / t of No. 2 oil is added, and stirred for 1 minute, and finally phosphate concentrate and phosphate tailings are obtained, and the finer tailings are returned to the rougher.

[0025] The results are shown in Table 1. The grade of P2O5 in the concentrate is 28.38%, and the grade of MgO in the concentrate is 0.57%.

[0026] Example 3

[0027] An application of a combined activator suitable for reverse flotation of phosphate rock. In this embodiment, the combined activator comprises 50% by mass of Acid Red 27 and 50% by mass of propionic acid, wherein the total mass percentage of Acid Red 27 and propionic acid is 100%. The specific flotation steps are as follows:

[0028] When the reverse flotation temperature is 15℃, the grinding fineness is -0.074mm, and the mass fraction is 85%, the following is adopted: Figure 1The "one coarse and one fine" reverse flotation closed-circuit process shown in the figure is as follows: 18 kg / t of sulfuric acid is added to the rougher, stirred for 4 minutes, 1 kg / t of a mixed collector of hydroxamic acid and butanol is added, stirred for 3 minutes, 0.4 kg / t of a combined activator is added, stirred for 2 minutes, 38 g / t of No. 2 oil is added, and stirred for 1 minute; 7.5 kg / t of sulfuric acid is added to the finer, stirred for 4 minutes, 1.1 g / t of a mixed collector of hydroxamic acid and butanol is added, stirred for 3 minutes, 0.3 kg / t of a combined activator is added, stirred for 2 minutes, 19 g / t of No. 2 oil is added, and stirred for 1 minute, and finally phosphate concentrate and phosphate tailings are obtained, and the finer tailings are returned to the rougher.

[0029] The results are shown in Table 1. The grade of P2O5 in the concentrate is 28.75%, and the grade of MgO in the concentrate is 0.37%.

[0030] Comparative Example 1

[0031] For comparison, the activator used in the present invention is currently commonly used ammonium hydroxide, and the specific flotation steps are as follows:

[0032] When the reverse flotation temperature is 15℃, the grinding fineness is -0.074mm, and the mass fraction is 85%, the following is adopted: Figure 1 The "one coarse and one fine" reverse flotation closed-circuit process shown in the figure is as follows: 20 kg / t of sulfuric acid is added to the rougher, stirred for 4 minutes, 2 kg / t of a mixed collector of hydroxamic acid and butanol is added, stirred for 3 minutes, 0.8 kg / t of ammonium hydroxide as an activator is added, stirred for 5 minutes, 80 g / t of No. 2 oil is added, and stirred for 1 minute; 7.5 kg / t of sulfuric acid is added to the finer, stirred for 4 minutes, 3 kg / t of a mixed collector of hydroxamic acid and butanol is added, stirred for 3 minutes, 0.4 kg / t of ammonium hydroxide as an activator is added, stirred for 3 minutes, 40 g / t of No. 2 oil is added, and stirred for 1 minute, and finally phosphate concentrate and phosphate tailings are obtained, and the finer tailings are returned to the rougher.

[0033] The results are shown in Table 1. The grade of P2O5 in the concentrate is 27.81%, and the grade of MgO in the concentrate is 1.2%.

[0034] Table 1 Closed-circuit process results of different embodiments

[0035] Collector samples <![CDATA[Grade of Concentrate P2O5 / %]]> <![CDATA[Recovery rate of P2O5 in concentrate / %]]> Example 1 28.59 87.55 Example 2 28.38 86.79 Example 3 28.75 90.18 Comparative Example 1 27.81 85.33

[0036] By comparing the examples with the comparative examples, it can be seen that the combined activator of the present invention can not only reduce the amount of collector used in the reverse flotation process, but also improve the grade and recovery efficiency of the phosphate concentrate. The reasons are as follows: Acid Red 27 and propionic acid can be co-adsorbed on the dolomite surface, thereby fully improving the hydrophobicity of the dolomite surface.

Claims

1. A combined activator suitable for reverse flotation of phosphate rock, characterized by: The combination activator includes Acid Red 27 and propionic acid.

2. The combined activator suitable for reverse flotation of phosphate rock according to claim 1, characterized in that: The mass percentage of Acid Red 27 in the combined activator is 30% to 60%, the mass percentage of propionic acid is 40% to 70%, and the total mass percentage of Acid Red 27 and propionic acid is 100%.

3. The combined activator suitable for reverse flotation of phosphate rock according to claim 1, characterized in that: The combined activator is used in a slurry with a pH range of 3-7.

4. Use of the combined activator according to claim 1 in reverse flotation of phosphate concentrate from phosphate ore.

5. The use according to claim 4, characterized in that: Reverse flotation is carried out through the "one coarse and one fine" process.

6. The use according to claim 5, characterized in that: The dosage of the combined activator in roughing is 0.4-0.6 kg / t; the dosage of the combined activator in fine selection is 0.2-0.3 kg / t.

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