Method for beneficiating lepidolite by flotation of a kaolin-scavenged underflow

Abstract

The application provides a method for enriching lepidolite by high-kaolin cleaning underflow flotation, which comprises the following steps: S1, raw material slurry: taking the underflow generated in the kaolin ore dressing cleaning operation, adding clean water to the underflow, stirring and slurring, and accurately preparing the slurry concentration to 25%. The fine mud components interfering with subsequent flotation are removed efficiently through 325 mesh wet screening classification, which effectively solves the industry problems of fine mud covering coarse target minerals and deteriorating flotation environment, and lays a key foundation for subsequent efficient flotation enrichment of pure lepidolite. Meanwhile, the "one roughing, one cleaning and one concentration" flotation process is innovatively designed, and the new type of collector and sodium hexametaphosphate inhibitor are matched, so that the flotation effect is better than that of the traditional flotation and impurity removal effect, and the scheme is simple and low in cost.

Description

Technical Field

[0001] This invention relates to the field of kaolin flotation technology, specifically to a method for enriching lithium iron phosphate mica by kaolin scavenging and bottom flow flotation. Background Technology

[0002] The lithium minerals in the scavenging underflow of kaolin ore are mainly muscovite and lepidolite, with low and unstable content. Exploring efficient collectors is crucial for recovering associated minerals during kaolin mining, thereby enhancing the overall value of kaolin ore. Mid-term experimental studies show that a flotation process consisting of roughing, scavenging, and cleaning can effectively recover lithium minerals from the scavenging underflow. The closed-circuit concentrate has a Li2O grade of 1.66% and a recovery rate of 91.40%, while the tailings have a Li2O grade of 0.028% and a recovery rate of 8.60%.

[0003] Finding the simplest and lowest-cost way to better remove mica and other metal oxide impurities from kaolin while maintaining good production efficiency is a worthwhile research direction. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a method for enriching lithium iron phosphate mica by scavenging underflow flotation of kaolin. The flotation process of coarse flotation, scavenging flotation, and fine flotation can effectively recover lithium minerals from the scavenging underflow and better remove mica and other metal oxide impurities contained in kaolin.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a method for enriching lithium iron phosphate mica by kaolin scavenging and bottom flow flotation, comprising the following steps:

[0008] S1. Raw material pulping:

[0009] Take the underflow generated during the kaolin beneficiation and scavenging operation, add clean water to the underflow, stir and slurry, and accurately prepare the slurry concentration to 25%;

[0010] S2, Staged Desliming:

[0011] The prepared 25% concentration slurry is screened through a 325-mesh vibrating screen to separate and remove the undersize product, while retaining the oversize product as flotation feed.

[0012] S3. Preparation of pharmaceutical solution:

[0013] The novel collector was prepared into a 5% working solution with water, and the inhibitor was prepared into a 10% working solution with water.

[0014] S4. Stirring, mixing, and adding chemicals:

[0015] The 325-mesh sieve material obtained in S2 above is transported to the pre-flotation mixing tank. The slurry is kept fully stirred and suspended in the mixing tank. According to the dry ore feed, a 5% collector solution is added to the mixing tank, followed by a 10% sodium hexametaphosphate solution. The slurry is stirred for 3-5 minutes to ensure that the reagent and mineral react evenly.

[0016] S5. Coarse flotation:

[0017] The slurry after conditioning is sent to the roughing flotation cell for flotation. The froth product produced by roughing is scraped off. This product is the rough concentrate, and the remaining slurry in the roughing cell is the roughing tailings.

[0018] S6, Selective Flotation:

[0019] The rough concentrate obtained in S5 is sent to the fine flotation cell for further selection. The foam product generated during the fine selection is scraped off, and this product is the final lithium iron phosphate mica concentrate.

[0020] S7, Sweep and float:

[0021] The roughing tailings obtained in S5 are sent to the scavenging flotation cell for further selection. During the scavenging operation, an appropriate amount of 5% collector solution is added based on the dry ore feed from the roughing process. The froth product generated by the scavenging is scraped off. This product is the scavenging concentrate. The remaining slurry in the scavenging cell is part of the final tailings. The scavenging concentrate is then returned to the flotation pre-stirring tank in S4 for further processing.

[0022] S8. Product Handling:

[0023] The final lithium iron ore concentrate obtained in S6 can be collected for further dewatering. The -325 mesh fine mud removed in S2 and the final tailings produced in S7 are collected and treated as the final tailings of the system.

[0024] Preferably, 25% in S1 is a weight percentage.

[0025] Preferably, the 5% and 10% in S3 are also weight percentages.

[0026] Preferably, in step S4, the amount of 5% collector solution added to the mixing tank is 400 g / t, and the amount of the prepared 10% sodium hexametaphosphate solution added to the mixing tank is 300 g / t.

[0027] Preferably, the inhibitor in S3 is a sodium hexametaphosphate solution.

[0028] Preferably, the 5% collector solution added in S7 is 30-50% of the amount of the crude collector.

[0029] (III) Beneficial Effects

[0030] This invention provides a method for enriching lithium iron phosphate mica by kaolin scavenging and bottom flow flotation. It has the following beneficial effects:

[0031] 1. This invention uses a 325-mesh wet screen for classification and desliming, effectively removing fine mud components that interfere with subsequent flotation. This effectively solves the industry problem of fine mud covering coarse target minerals and deteriorating the flotation environment, laying a key foundation for the subsequent efficient flotation enrichment of pure lithium iron phosphate mica. At the same time, it innovatively designs a "coarsening, scavenging, and refining" flotation process and matches it with a new type of collector and sodium hexametaphosphate inhibitor combination. The flotation effect is better than traditional flotation and impurity removal, and the solution is simple and low in cost. Attached Figure Description

[0032] Figure 1 This is a flowchart of a method for enriching lithium iron phosphate mica by kaolin scavenging and bottom flotation proposed in this invention. Detailed Implementation

[0033] 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.

[0034] Example:

[0035] like Figure 1 As shown, this embodiment of the invention provides a method for enriching lithium iron phosphate mica by kaolin scavenging and bottom flotation, comprising the following steps:

[0036] S1. Raw material pulping:

[0037] Take the underflow generated during the kaolin beneficiation and scavenging operation, add clean water to the underflow, stir and slurry, and accurately prepare the slurry concentration to 25%;

[0038] S2, Staged Desliming:

[0039] The prepared 25% concentration slurry is screened through a 325-mesh vibrating screen to separate and remove the undersize product, while retaining the oversize product as flotation feed.

[0040] S3. Preparation of pharmaceutical solution:

[0041] The novel collector was prepared into a 5% working solution with water, and the inhibitor was prepared into a 10% working solution with water.

[0042] S4. Stirring, mixing, and adding chemicals:

[0043] The 325-mesh sieve material obtained in S2 above is transported to the pre-flotation mixing tank. The slurry is kept fully stirred and suspended in the mixing tank. According to the dry ore feed, a 5% collector solution is added to the mixing tank, followed by a 10% sodium hexametaphosphate solution. The slurry is stirred for 3-5 minutes to ensure that the reagent and mineral react evenly.

[0044] S5. Coarse flotation:

[0045] The slurry after conditioning is sent to the roughing flotation cell for flotation. The froth product produced by roughing is scraped off. This product is the rough concentrate, and the remaining slurry in the roughing cell is the roughing tailings.

[0046] S6, Selective Flotation:

[0047] The rough concentrate obtained in S5 is sent to the fine flotation cell for further selection. The foam product generated during the fine selection is scraped off, and this product is the final lithium iron phosphate mica concentrate.

[0048] S7, Sweep and float:

[0049] The roughing tailings obtained in S5 are sent to the scavenging flotation cell for further selection. During the scavenging operation, an appropriate amount of 5% collector solution is added based on the dry ore feed from the roughing process. The froth product generated by the scavenging is scraped off. This product is the scavenging concentrate. The remaining slurry in the scavenging cell is part of the final tailings. The scavenging concentrate is then returned to the flotation pre-stirring tank in S4 for further processing.

[0050] S8. Product Handling:

[0051] The final lithium iron ore concentrate obtained in S6 can be collected for further dewatering. The -325 mesh fine mud removed in S2 and the final tailings produced in S7 are collected and treated as the final tailings of the system.

[0052] The 25% in S1 is a weight percentage.

[0053] The 5% and 10% in S3 are also weight percentages.

[0054] In S4, the amount of 5% collector solution added to the mixing tank is 400 g / t, and the amount of 10% sodium hexametaphosphate solution added to the mixing tank is 300 g / t.

[0055] The inhibitor used in S3 is sodium hexametaphosphate solution.

[0056] The 5% collector solution added in S7 is 30-50% of the amount of the crude collector.

[0057] Experimental example:

[0058] 1. Preparation of experimental materials:

[0059] Kaolin scavenging bottom flow is uniformly used as the raw ore;

[0060] Comparison of collectors: new collector, No. 2 collector (for conventional production), No. 3 collector (for conventional production);

[0061] 2. Standardized pretreatment process:

[0062] Slurry preparation and desliming:

[0063] The scavenging underflow is prepared into a 25% concentration slurry, which is then passed through a 325-mesh vibrating screen to remove the -325-mesh fine mud, while retaining the +325-mesh coarse particle size as a uniform feed.

[0064] 3. Preparation of the medicine:

[0065] The three collectors were each prepared into a 5% solution, and the inhibitor sodium hexametaphosphate was prepared into a 10% solution.

[0066] 4. Equipment parameters:

[0067] Select a suitable process route for flotation extraction, and the parameters are shown in Table 1 below:

[0068] Table 1

[0069]

[0070] 5. Group experiment execution:

[0071] Experimental Group 1: Novel Collector

[0072] Experimental group 2: No. 2 collector

[0073] Experimental group 3: 3# collector

[0074] Operational consistency control: The slurry preparation time is uniformly set at 4 minutes; the aeration rate and foam scraping frequency for roughing / scavenging / cleaning are kept consistent; concentrate and tailings are collected, dewatered, weighed, and analyzed simultaneously.

[0075] 6. Data analysis indicators: Products measured: concentrate, tailings, raw ore;

[0076] Key data: Productivity (%), Li2O grade (%), Li2O recovery rate (%). Specific experimental results are shown in Table 2 below.

[0077] Table 2

[0078]

[0079] Analysis of Table 2 shows that the type of collector has a significant impact on the flotation of lepidolite. The grade and recovery rate of Li2O in the mica concentrate obtained by flotation with collector #2 are both relatively low. The grade and recovery rate of Li2O in the mica concentrate obtained by flotation with collector #3 are both higher than those obtained with collector #2. However, the collector of this invention has the highest grade and recovery rate of Li2O in the mica concentrate. Therefore, the collector of this invention was selected as the collector for this mica ore.

[0080] 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 method for enriching lithium iron phosphate mica by kaolin scavenging and bottom flow flotation, characterized in that, Includes the following steps: S1. Raw material pulping: Take the underflow generated during the kaolin beneficiation and scavenging operation, add clean water to the underflow, stir and slurry, and accurately prepare the slurry concentration to 25%; S2, Staged Desliming: The prepared 25% concentration slurry is screened through a 325-mesh vibrating screen to separate and remove the undersize product, while retaining the oversize product as flotation feed. S3. Preparation of pharmaceutical solution: The novel collector was prepared into a 5% working solution with water, and the inhibitor was prepared into a 10% working solution with water. S4. Stirring, mixing, and adding chemicals: The 325-mesh sieve material obtained in S2 above is transported to the pre-flotation mixing tank. The slurry is kept fully stirred and suspended in the mixing tank. According to the dry ore feed, a 5% collector solution is added to the mixing tank, followed by a 10% sodium hexametaphosphate solution. The slurry is stirred for 3-5 minutes to ensure that the reagent and mineral react evenly. S5. Coarse flotation: The slurry after conditioning is sent to the roughing flotation cell for flotation. The froth product produced by roughing is scraped off. This product is the rough concentrate. The remaining slurry in the roughing cell is the roughing tailings. S6, Selective Flotation: The rough concentrate obtained in S5 is sent to the fine flotation cell for further selection. The foam product generated during the fine selection is scraped off, and this product is the final lithium iron phosphate mica concentrate. S7, Sweep and float: The roughing tailings obtained in S5 are sent to the scavenging flotation cell for further selection. During the scavenging operation, an appropriate amount of 5% collector solution is added based on the dry ore feed from the roughing process. The froth product generated by the scavenging is scraped off. This product is the scavenging concentrate. The remaining slurry in the scavenging cell is part of the final tailings. The scavenging concentrate is then returned to the flotation pre-stirring tank in S4 for further processing. S8. Product Handling: The final lithium iron ore concentrate obtained in S6 can be collected for further dewatering. The -325 mesh fine mud removed in S2 and the final tailings produced in S7 are collected and treated as the final tailings of the system.

2. The method for enriching lithium iron phosphate mica by kaolin scavenging and bottom flow flotation according to claim 1, characterized in that: The 25% in S1 is a weight percentage.

3. The method for enriching lithium iron phosphate mica by kaolin scavenging and bottom flotation according to claim 1, characterized in that: The 5% and 10% in S3 are also weight percentages.

4. The method for enriching lithium iron phosphate mica by kaolin scavenging and bottom flow flotation according to claim 1, characterized in that: In step S4, the amount of 5% collector solution added to the mixing tank is 400 g / t, and the amount of 10% sodium hexametaphosphate solution added to the mixing tank is 300 g / t.

5. The method for enriching lithium iron phosphate mica by kaolin scavenging and bottom flow flotation according to claim 1, characterized in that: The inhibitor in S3 is sodium hexametaphosphate solution.

6. The method for enriching lithium iron phosphate mica by kaolin scavenging and bottom flow flotation according to claim 1, characterized in that: The 5% collector solution added in S7 is 30-50% of the amount of the crude collector.

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