Method for strengthening flotation recovery of micro-fine particle rubidium and cesium co-associated lepidolite

Abstract

The invention discloses a method for strengthening flotation recovery of micro-fine particle rubidium and cesium co-associated lepidolite. The method mainly comprises the following steps: blending the micro-fine particle rubidium and cesium co-associated lepidolite into ore pulp by using micro-nano bubble deionized water; sequentially adding a regulating agent and an anion-cation combined collecting agent, fully stirring, and regulating the pH value of the ore pulp; and a flotation machine is used for sorting the evenly-stirred ore pulp, and rubidium and cesium co-associated lepidolite concentrate is obtained. According to the flotation result, on the premise that the using amount of the collecting agent is the same, the recovery rate of the cavitation micro-nano bubble flotation is increased compared with that of conventional bubble flotation, and the flotation recovery rate of the micro-fine particle rubidium-cesium co-associated lepidolite which is an important metal mineral resource can be remarkably increased through the method; and efficient recovery of the rubidium-cesium carrier minerals is effectively realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of micro-particle mineral flotation, and particularly relates to a method for strengthening flotation recovery of micro-particle rubidium and cesium co-associated lepidolite. BACKGROUND

[0002] Rubidium and cesium are indispensable in high-tech fields such as national defense and military industry, aerospace, electronic information and biological medicine, and are basic raw materials for seeking new energy conversion and new communication technology research. In recent years, magneto-hydrodynamic power generation, thermionic conversion power generation, ion thruster and ion cloud communication have developed rapidly, and about 80% of metallic rubidium and 70% of metallic cesium are used in these fields. The main minerals of cesium and rubidium deposits in China include pollucite, lepidolite and potassium feldspar, and the main industrial minerals are pollucite and lepidolite. Jiangxi Yichun has the largest lepidolite mine in the world, and the lepidolite is mainly fine-grained and embedded. The collision and adhesion probability of fine-grained minerals (-38 μm) with bubbles is low in the flotation process, which leads to a decrease in recovery rate, and the fine-grained minerals are prone to be pelitization, thereby affecting the flotation effect. At present, the development of lepidolite mine only focuses on the efficient extraction of lithium, and the cesium and rubidium resources cannot be effectively recovered. SUMMARY

[0003] In view of the problems in the prior art, the application provides a method for strengthening flotation recovery of micro-particle rubidium and cesium co-associated lepidolite, which provides a more efficient way for the development of rubidium and cesium resources.

[0004] To solve the above technical problems, the technical scheme of the application is as follows:

[0005] A method for strengthening flotation recovery of micro-particle rubidium and cesium co-associated lepidolite, wherein micro-nano bubble deionized water is added to micro-particle rubidium and cesium co-associated lepidolite to prepare a slurry for flotation.

[0006] The micro-particle rubidium and cesium co-associated lepidolite disclosed by the application contains 0.1-0.3% of rubidium and 0.04-0.1% of cesium, and the particle size is less than 0.038 mm.

[0007] In the application, deionized water is introduced into a micro-nano bubble generator for cavitation circulation to obtain micro-nano bubble deionized water.

[0008] Further,

[0009] The water pressure of the micro-nano bubble generator is 0.5-0.6 MPa, the gas inlet amount is 0.15-0.2 L / min, and the running time is at least 8 min.

[0010] The application is a method for strengthening the flotation recovery of fine-grained rubidium and cesium co-associated lithium mica, more specifically, an adjusting agent, a cationic-anionic combined collector are sequentially added to the prepared ore slurry, and fully stirred to obtain an ore slurry with a pH value of 4-10; a flotation machine is used to separate the ore slurry to obtain a rubidium and cesium co-associated lithium mica concentrate.

[0011] Further,

[0012] The mass concentration of the ore slurry is 30%-35%.

[0013] The adjusting agent includes hydrochloric acid and sodium carbonate;

[0014] The cationic collector in the cationic-anionic combined collector is prepared by mixing dodecylamine and hydrochloric acid at a molar ratio of 1:1 to form a dodecylamine cationic collector, the anionic collector is sodium oleate, and the ore slurry is prepared using micro-nano bubble deionized water, the concentration of dodecylamine in the ore slurry is not more than 130 mg / L, the concentration of sodium oleate is not more than 650 mg / L, and the concentration ratio of dodecylamine to sodium oleate is 1:1-1:5.

[0015] In the flotation recovery method of the application, the impeller rotation speed of the flotation machine is 1800-2000 r / min, the ore slurry is stirred for 3 min after the collector is added, and then the froth is scraped, and the flotation froth scraping time is at least 4 min.

[0016] Further preferably,

[0017] In the stirred ore slurry, the fine-grained rubidium and cesium co-associated lithium mica pure mineral is fully mixed, the collector is sequentially added, and the froth is scraped after stirring.

[0018] The application has the following beneficial effects:

[0019] The application focuses on introducing micro-nano bubbles into the flotation system of fine-grained rubidium and cesium co-associated lithium mica, increasing the attachment probability of mineral particles and bubbles, achieving better adsorption between fine-grained lithium mica and micro-nano bubbles, and thus improving the recovery rate of fine-grained rubidium and cesium co-associated lithium mica. The method solves the problem of traditional flotation methods in processing fine-grained rubidium and cesium co-associated lithium mica minerals, and provides a feasible technical solution for efficient use of rubidium and cesium resources in rubidium and cesium co-associated lithium mica. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following briefly introduces the drawings needed to be used in the embodiments of the application:

[0021] Figure 1 is a schematic diagram of two different system flotation experiments provided by the embodiments of the application.

[0022] Figure 2Recovery rate and grade of rubidium and cesium in the concentrate of Example 1 of the present application.

[0023] Figure 3 Recovery rate and grade of rubidium and cesium in the concentrate of Example 2 of the present application.

[0024] Figure 4 Recovery rate and grade of rubidium and cesium in the concentrate of Comparative Example 1 of the present application.

[0025] Figure 5 Recovery rate and grade of rubidium and cesium in the concentrate of Comparative Example 2 of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and points of the present application more clear, the present application is further described in detail below in combination with examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0027] In view of the problems existing in the prior art, as shown in the accompanying drawings, Figure 1 The present application provides a method for strengthening the flotation recovery of micro-fine particle rubidium-cesium co-associated lepidolite, which compares the flotation behaviors of micro-fine particle rubidium-cesium co-associated lepidolite in two different systems of conventional deionized water and micro-nano bubble deionized water, and determines the flotation recovery rates of rubidium-cesium carrier minerals in the two different systems.

[0028] Example 1

[0029] (1) Micro-nano bubble deionized water was generated in a micro-nano bubble generator using deionized water; the water pressure of the micro-nano bubble generator was about 0.5 MPa, the air inlet amount was about 0.2 L / min, and the running time was 8 min; the micro-nano bubble deionized water was added to a flotation tank, and then micro-fine particle rubidium-cesium co-associated lepidolite (rubidium content 0.2275%, cesium content 0.0587%, particle size less than 0.038 mm) was added, the pulp mass concentration was 30%, and the flotation machine was started.

[0030] (2) Hydrochloric acid was added as an adjusting agent to adjust the pH value of the pulp to 5; dodecylamine and hydrochloric acid were prepared into a dodecylamine cationic collector at a molar ratio of 1:1, and sodium oleate was prepared into an anionic collector, both of which were prepared from micro-nano bubble deionized water; the concentration of dodecylamine in the pulp was 130 mg / L, and the concentration of sodium oleate was 650 mg / L; after the flotation tank containing the rubidium-cesium carrier minerals was added, it was fully stirred.

[0031] (3) The flotation machine was used to separate the fully stirred pulp containing the rubidium-cesium carrier minerals; the impeller speed of the flotation machine was 1992 r / min; after 3 min of stirring after the addition of the collector, the froth was scraped; the froth scraping time was 4 min.

[0032] The obtained rubidium and cesium co-associated lithium mica concentrate is filtered and dried at 70°C.

[0033] Conclusion: The flotation results show that under the action of micro-nano bubbles, when the pH of the slurry is 5, the recovery rates of Rb and Cs in the concentrate are 70.61% and 71.72% respectively, and the grades are 0.21% and 0.051% respectively.

[0034] Example 2

[0035] (1) Micro-nano bubble deionized water is generated in a micro-nano bubble generator with a water pressure of about 0.5 MPa and an air inlet amount of about 0.2 L / min, and the micro-nano bubble deionized water is added to the flotation tank, followed by adding micro-fine particle rubidium and cesium co-associated lithium mica (rubidium content 0.2275%, cesium content 0.0587%, particle size less than 0.038 mm), the mass concentration of the slurry is 30%, and the flotation machine is started;

[0036] (2) Sodium carbonate is added to adjust the pH value of the slurry to 7, dodecylamine and hydrochloric acid are mixed in a molar ratio of 1:1 to prepare a dodecylamine cationic collector, and sodium oleate is used as an anionic collector, both of which are prepared by micro-nano bubble deionized water, the concentration of dodecylamine in the slurry is 130 mg / L, and the concentration of sodium oleate is 650 mg / L; After adding the flotation tank containing rubidium and cesium carrier minerals, it is fully stirred.

[0037] (3) The flotation machine is used to separate the fully stirred rubidium and cesium carrier mineral slurry, the impeller speed of the flotation machine is 1992 r / min, and the froth is scraped after 3 min of stirring after adding the collector, and the flotation froth scraping time is 4 min;

[0038] The obtained rubidium and cesium co-associated lithium mica concentrate is filtered and dried at 70°C.

[0039] Conclusion: The flotation results show that under the action of micro-nano bubbles, when the pH of the slurry is 7, the recovery rates of Rb and Cs in the concentrate are 61.61% and 65.18% respectively, and the grades are 0.2% and 0.04% respectively.

[0040] Comparative Example 1

[0041] Except that the micro-nano bubble deionized water is replaced by deionized water, the rest of the steps are the same as in Example 1, and the conclusion is that under the action of conventional deionized water, when the pH of the slurry is 5, the recovery rates of Rb and Cs in the concentrate are 58.93% and 61.81% respectively, and the grades are 0.18% and 0.044% respectively.

[0042] Comparative Example 2

[0043] Except that the micro-nano bubble deionized water is replaced by deionized water, the rest of the steps are the same as example 2. Conclusion: The flotation results show that under the action of conventional bubbles, when the pH of the ore pulp is 7, the recovery rates of Rb and Cs in the concentrate are 47.06% and 44.51% respectively, and the grades are 0.16% and 0.047% respectively.

Claims

1. A method for enhancing the flotation recovery of fine-grained rubidium, cesium co- associated lepidolite, characterized in that, The micro-nano bubble deionized water is added into the micro-fine particle rubidium and cesium co-associated lithium mica to prepare a slurry for flotation.

2. The method of claim 1, wherein, The rubidium content of the micro-fine particle rubidium and cesium co-associated lithium mica is 0.1-0.3%, the cesium content is 0.04-0.1%, and the particle size is less than 0.038 mm.

3. The method of claim 1, wherein, The deionized water is circulated in a micro-nano bubble generator to obtain micro-nano bubble deionized water.

4. The method of claim 3, wherein, The water pressure of the micro-nano bubble generator is 0.5-0.6 MPa, the air inlet amount is 0.15-0.2 L / min, and the running time is at least 8 min.

5. The method of claim 1, wherein, The adjusting agent, the cationic and anionic combined collector are sequentially added into the prepared slurry, and the slurry is fully stirred to obtain a slurry with a pH value of 4-10; the slurry is separated by a flotation machine to obtain a rubidium and cesium co-associated lithium mica concentrate.

6. The method according to claim 1 or 5, characterized in that, The mass concentration of the slurry is 30%-35%.

7. The method of claim 5, wherein, The adjusting agent comprises hydrochloric acid and sodium carbonate. The cationic collector in the cationic and anionic combined collector is dodecylamine and hydrochloric acid prepared according to a 1:1 molar ratio to obtain a dodecylamine cationic collector, and the anionic collector is sodium oleate, which is prepared using micro-nano bubble deionized water, and the concentration of dodecylamine in the slurry is not more than 130 mg / L, and the concentration of sodium oleate in the slurry is not more than 650 mg / L.

8. The method according to claim 1 or 7, characterized in that, The concentration ratio of dodecylamine to sodium oleate in the slurry is 1:1-1:

5.

9. The method of claim 1 or 5, wherein, The rotating speed of the impeller of the flotation machine is 1800-2000 r / min.

10. The method of claim 1 or 5 or 9, wherein, The froth is scraped after 3 min of stirring after the collector is added, and the froth scraping time for flotation is at least 4 min.

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