Composite flotation reagent for separating feldspar and quartz and flotation method

Abstract

The invention provides a composite flotation reagent for separating feldspar and quartz and a flotation method. The composite flotation reagent for separating the feldspar and the quartz comprises a first flotation agent, a second flotation agent and a third flotation agent, and the first flotation agent comprises, by mass, 20-25 parts of a collecting agent and 1-4 parts of a pH adjusting agent; and the second flotation agent comprises the following components in parts by mass: 6-8 parts of an inhibitor and 1-4 parts of mixed phosphate. According to the method, one-time flotation separation of quartz and feldspar is conducted on the lepidolite tailings through the flotation reagent, quartz fine sand with the SiO2 content higher than 99% can be obtained, the standard requirement of glass industry materials is met, and the effect is close to the flotation separation effect of hydrofluoric acid; therefore, the flotation process is simplified under the condition that the flotation effect is guaranteed, and compared with flotation separation conducted through a hydrofluoric acid method, the influence of flotation separation conducted through the composite flotation reagent for separating feldspar and quartz in the embodiment on the environment is greatly reduced.

Description

Technical Field

[0001] The present application relates to the technical field of lithium mica tailings productization, and in particular to a composite flotation agent and a flotation method for separating feldspar and quartz. Background Art

[0002] Lepidolite tailings include feldspar and quartz, which can be used in glass, ceramics, refractory materials, photovoltaics, semiconductors, etc. With the rapid development of my country's economy, the quantity and quality of demand for both have greatly increased. In order to meet the requirements of quartz and feldspar in many fields and industries, and to improve the product quality of quartz and feldspar, enhance their competitiveness and increase product added value, the two must be effectively separated. In order to improve the separation efficiency of feldspar and quartz, HF is usually used as an activator for feldspar, which is extremely harmful to the environment and complicated in the flotation process. Summary of the invention

[0003] The present application provides a composite flotation agent and a flotation method for separating feldspar and quartz, which are beneficial to reducing harm to the environment and simplifying the flotation process.

[0004] In a first aspect, an embodiment of the present application provides a composite flotation reagent for separating feldspar and quartz, wherein the composite flotation reagent for separating feldspar and quartz comprises:

[0005] The first flotation agent has a mass ratio of 20-25 parts of collector and 1-4 parts of pH adjuster;

[0006] The second flotation agent has a mass ratio of 6-8 parts of inhibitor and 1-4 parts of mixed phosphate.

[0007] According to the first aspect, in a possible implementation, the collector includes one or more of dodecylamine, octadecylamine, coconut amine, kerosene, mineral oil, light diesel oil, oleic acid, sodium dodecyl sulfate, and sodium dodecyl sulfonate.

[0008] According to the first aspect, in a possible implementation manner, the pH adjuster includes one or more of sulfuric acid, nitric acid, acetic acid, and hydrochloric acid.

[0009] According to the first aspect, in a possible implementation manner, the inhibitor includes one or more of sodium silicate, sodium hexametaphosphate, and sodium fluoride.

[0010] According to the first aspect, in a possible implementation, the mixed phosphate includes one or more of disodium dihydrogen pyrophosphate, sodium tripolyphosphate, and sodium dihydrogen phosphate.

[0011] In a second aspect, the present application also provides a flotation method for separating feldspar and quartz, the method comprising:

[0012] placing a flotation raw material in a flotation cell, and processing an acidic aqueous solution having a pH of 2.5 into the flotation cell to form a slurry;

[0013] Adding a first flotation agent into the flotation tank and stirring evenly;

[0014] Adding a second flotation agent into the flotation tank and stirring evenly;

[0015] Infusing the flotation tank with gas to generate bubbles;

[0016] Scraping the frothed flotation tank to separate the froth product into a froth product and a tank bottom product, wherein the froth product is a feldspar coarse concentrate and the tank bottom product is a quartz concentrate;

[0017] The first flotation agent and the second flotation agent are the first flotation agent and the second flotation agent of the composite flotation agent for separating feldspar and quartz as described above.

[0018] According to the first aspect, in a possible implementation manner, the dosage of the first flotation agent is (1-10) kg / t.

[0019] According to the first aspect, in a possible implementation manner, the dosage of the second flotation agent is (1-5) kg / t.

[0020] The composite flotation agent and flotation method for separating feldspar and quartz provided in the present application, the collector changes the surface properties of the feldspar by binding to specific action sites on the surface of the feldspar, making the feldspar particles hydrophobic, so that they are easily captured by bubbles and float up. The role of the pH adjuster is to accurately adjust the pH value of the slurry to ensure that the surface of the feldspar carries a negative charge, while the surface of the quartz remains electrically neutral or positively charged, which is beneficial to the subsequent separation process. The selective desorption effect of the inhibitor effectively prevents quartz particles from being mistakenly captured by bubbles and ensures the sedimentation of quartz. The addition of mixed phosphates, through its specific chemical properties, further amplifies the difference in hydrophobic properties between feldspar and quartz, making the flotation separation process more efficient.

[0021] By using the flotation agent to perform primary flotation separation of quartz and feldspar on lithium mica tailings, quartz concentrate with an SiO2 content higher than 99% can be obtained, meeting the standard requirements for materials used in the glass industry and approaching the effect of flotation separation using hydrofluoric acid; thereby simplifying the flotation process while ensuring the flotation effect, and compared with flotation separation using the hydrofluoric acid method, the impact of flotation separation using the composite flotation agent for separating feldspar and quartz in this embodiment on the environment is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 The present invention is a schematic flow chart of a flotation method for separating feldspar and quartz according to an embodiment;

[0024] Figure 2 The figure is a schematic flow chart of a flotation method for separating feldspar and quartz according to another embodiment. DETAILED DESCRIPTION

[0025] The words "preferably", "more preferably", etc. in the present invention refer to embodiments of the present invention that may provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0026] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0027] The following will be combined with 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 the present invention.

[0028] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0029] In a first aspect, the present application provides a composite flotation agent for separating feldspar and quartz (hereinafter referred to as the composite flotation agent). In some embodiments, the composite flotation agent includes a first flotation agent and a second flotation agent. The mass ratio of the components in the first flotation agent is 20-25 parts of the collector and 1-4 parts of the pH adjuster; the mass ratio of the components in the second flotation agent is 6-8 parts of the inhibitor and 1-4 parts of the mixed phosphate.

[0030] In this embodiment, the collector changes the surface properties of the feldspar by binding to specific action sites on the surface of the feldspar, making the feldspar particles hydrophobic, so that they are easily captured by bubbles and float up. The role of the pH adjuster is to accurately adjust the pH value of the slurry to ensure that the surface of the feldspar carries a negative charge, while the surface of the quartz remains electrically neutral or positively charged, which is beneficial to the subsequent separation process. The selective desorption effect of the inhibitor effectively prevents quartz particles from being mistakenly captured by bubbles and ensures the sedimentation of quartz. The addition of mixed phosphates, through its specific chemical properties, further amplifies the difference in hydrophobic properties between feldspar and quartz, making the flotation separation process more efficient.

[0031] By using the flotation agent to perform primary flotation separation of quartz and feldspar on the lithium mica tailings, quartz concentrate with an SiO2 content higher than 99% can be obtained, meeting the standard requirements for materials used in the glass industry and approaching the effect of flotation separation using hydrofluoric acid; thereby simplifying the flotation process while ensuring the flotation effect, and compared with flotation separation using the hydrofluoric acid method, the impact of flotation separation using the composite flotation agent in this embodiment on the environment is greatly reduced.

[0032] In some embodiments, the collector includes one or more of dodecylamine, octadecylamine, coconut amine, kerosene, mineral oil, light diesel oil, oleic acid, sodium dodecyl sulfate, and sodium dodecyl sulfonate. The above collector molecules have excellent adsorption properties, and they can be tightly bound to the surface of feldspar through physical or chemical effects to form a stable adsorption film. When the collector molecules are successfully adsorbed on the surface of feldspar, they will significantly change the wettability of the feldspar surface, changing it from hydrophilic to hydrophobic. Make the feldspar particles more easily captured by bubbles and float up.

[0033] In some embodiments, the pH adjuster includes one or more of sulfuric acid, nitric acid, acetic acid, and hydrochloric acid. These inorganic acids or organic acids can effectively reduce the pH value of the pulp, causing the surface of feldspar to be negatively charged, while the surface of quartz remains relatively neutral or positively charged, and this charge difference provides favorable conditions for subsequent flotation separation.

[0034] In some embodiments, the inhibitor includes one or more of sodium silicate, sodium hexametaphosphate, and sodium fluoride.

[0035] Sodium silicate will undergo a series of chemical reactions in an acidic environment to generate inhibitory compounds. These compounds can be adsorbed on the surface of quartz particles to form a protective film that prevents the collector from contacting the quartz surface.

[0036] Sodium hexametaphosphate can also play an effective inhibitory role in an acidic environment. It can form stable complexes with metal ions on the quartz surface through the anions generated by ionization. These complexes can change the chemical properties of the quartz surface and reduce its floatability. In addition, sodium hexametaphosphate also has a dispersing effect, which can increase the electrostatic repulsion between quartz particles, keep them dispersed, and not easily captured by bubbles. In an acidic environment, these effects of sodium hexametaphosphate are further enhanced, thereby improving the selective inhibition effect on quartz.

[0037] The inhibitory effect of sodium fluoride on quartz in an acidic environment is mainly reflected in the formation of complexes with metal ions on the surface of quartz. These complexes can change the structure and properties of the quartz surface and reduce its affinity with the collector. At the same time, the acidic environment helps sodium fluoride to react more fully with the metal ions on the surface of quartz, thereby improving the inhibitory effect.

[0038] When sodium silicate, sodium hexametaphosphate and sodium fluoride are used in combination as inhibitors, they can play a synergistic role and further improve the separation efficiency of feldspar and quartz. In an acidic environment, these inhibitors can more fully exert their respective mechanisms of action to achieve precise control of mineral surface properties. By adjusting the type and amount of inhibitors, the flotation process can be optimized and the separation effect can be improved.

[0039] In some embodiments, the mixed phosphate includes one or more of disodium dihydrogen pyrophosphate, sodium tripolyphosphate, and sodium dihydrogen phosphate.

[0040] Disodium dihydrogen pyrophosphate (DSPP) has high stability in acidic environment and is easily soluble in water. In the flotation separation of feldspar and quartz, disodium dihydrogen pyrophosphate can selectively react with metal ions on the surface of quartz to form a hydrophilic film. This hydrophilic film can hinder the contact between the collector and the quartz surface, thereby reducing the floatability of quartz. At the same time, since disodium dihydrogen pyrophosphate is more likely to react with metal ions on the surface of quartz under acidic conditions, its selective inhibition effect is more significant in an acidic environment.

[0041] Sodium tripolyphosphate (STPP) easily decomposes into free phosphate ions in an acidic environment and releases a large amount of heat. This decomposition reaction not only changes the pH value of the solution, but also affects the charge state and wettability of the mineral surface. In the flotation separation of feldspar and quartz, sodium tripolyphosphate can selectively inhibit the flotation of quartz. The mechanism is that sodium tripolyphosphate can significantly affect the adsorption of the collector on the quartz surface, while having little effect on the adsorption process on the feldspar surface. In an acidic environment, the decomposition products of sodium tripolyphosphate further enhance this selective inhibition, thereby improving the separation efficiency of feldspar and quartz.

[0042] Sodium dihydrogen phosphate (NaH2PO4) is an inorganic acid salt whose acidic aqueous solution is acidic under acidic conditions. In the flotation separation of feldspar and quartz, sodium dihydrogen phosphate mainly affects the flotation process by adjusting the pH value of the solution and the charge state of the mineral surface. In an acidic environment, sodium dihydrogen phosphate can lower the pH value of the solution, thereby changing the charge distribution and wettability of the mineral surface. This change helps to enhance the difference in hydrophobic properties between feldspar and quartz, making it easier for the collector to bind to the feldspar surface, while weakening its ability to bind to the quartz surface. Therefore, the use of sodium dihydrogen phosphate in an acidic environment can further improve the separation efficiency of feldspar and quartz.

[0043] In an acidic environment, disodium dihydrogen pyrophosphate, sodium tripolyphosphate and sodium dihydrogen phosphate can work synergistically to further amplify the difference in hydrophobic properties between feldspar and quartz. These phosphates affect the properties of mineral surfaces through different mechanisms, such as forming a hydrophilic film, affecting the adsorption of collectors, and adjusting the pH value and charge state of the solution. These mechanisms work together in the flotation separation process of feldspar and quartz, significantly improving the separation efficiency.

[0044] Add 20-25 parts of collector and 1-4 parts of pH adjuster into a stirring bucket filled with an appropriate amount of water, stir for 10-50 minutes until the mixture is uniform, and obtain the first flotation agent.

[0045] Add 6-8 parts of inhibitor and 1-4 parts of mixed phosphate into a stirring bucket filled with an appropriate amount of water, stir for 10-50 minutes until the mixture is uniform, and obtain the second flotation agent.

[0046] When preparing the flotation agent, it should be ensured that all ingredients are completely dissolved and mixed evenly to obtain the best flotation effect. The stirring time can be adjusted according to the actual situation to ensure that the solution reaches the required uniformity. The dosage and proportion of the flotation agent should be optimized according to the specific ore properties and flotation conditions to obtain the best separation effect.

[0047] In a second aspect, the present application also provides a flotation method for separating feldspar and quartz, such as Figure 1 As shown, the method comprises the following steps:

[0048] Step S10, placing the flotation raw material in a flotation tank, and processing an acidic aqueous solution with a pH of 2.5 into the flotation tank to form a slurry;

[0049] The flotation raw material can be lithium mica tailings containing feldspar and quartz.

[0050] Step S20, adding a first flotation agent into the flotation tank and stirring evenly;

[0051] The dosage of the first flotation agent is (1-10) kg / t.

[0052] The first flotation agent may include a collector and a pH adjuster to change the properties of the mineral surface to make it hydrophobic and easy to be captured by bubbles. The first flotation agent is evenly added to the flotation tank and stirred evenly to ensure that the flotation agent can fully contact with the ore particles and play a role.

[0053] Step S30, adding a second flotation agent into the flotation tank and stirring evenly;

[0054] The dosage of the second flotation agent is (1-5) kg / t.

[0055] The second flotation agent may contain a depressant and a mixed phosphate to suppress the flotation of quartz and enhance the difference in hydrophobic properties between feldspar and quartz. After the first flotation agent is added and stirred evenly, the second flotation agent is evenly added to the flotation tank and stirred evenly again.

[0056] Step S40, inflating the flotation tank to generate bubbles;

[0057] The flotation tank is aerated to produce bubbles. These bubbles carry mineral particles attached to their surface as they rise. Since the surface of feldspar has become hydrophobic and adsorbed the flotation agent, it is more easily captured by the bubbles.

[0058] Step S50, scraping the flotation tank after frothing to separate into a froth product and a tank bottom product, wherein the froth product is a feldspar rough concentrate, and the tank bottom product is a quartz concentrate;

[0059] The flotation tank is scraped after foaming to separate the foam product from the bottom product. The foam product is mainly feldspar rough concentrate, because feldspar particles are more easily captured by bubbles and float to the surface. The bottom product is mainly quartz concentrate, because quartz particles are not captured by bubbles and remain at the bottom of the tank.

[0060] The first flotation agent and the second flotation agent are the first flotation agent and the second flotation agent of the composite flotation agent as described above.

[0061] The first flotation agent and the second flotation agent used in the flotation method provided in this embodiment are the composite flotation agents described above. These composite flotation agents may contain a variety of chemical components, such as collectors, inhibitors, pH adjusters, and mixed phosphates, which work together to amplify the difference in hydrophobic properties between feldspar and quartz, thereby achieving efficient separation.

[0062] To improve the flotation quality, Figure 2 As shown, the above steps S20 to S50 can be repeated, that is, the steps of adding the first flotation agent and the second flotation agent, aerating and bubbling, and scraping and separating the bubbles can be repeated.

[0063] The bottom product after multiple flotation is separated by filtration, and the filtrate obtained by filtration separation can be used as an acidic aqueous solution mixed with the flotation raw material to prepare the slurry, thereby reducing the amount of strong acid used and discharge.

[0064] Embodiment 1:

[0065] The present embodiment provides a composite flotation agent for separating feldspar and silica sand from lithium mica tailings. The tailings after pre-enrichment of lithium mica by flotation of lithium-containing ore in Yongxing, Yichun are used as flotation raw materials. The flotation agent is used to perform two-sweep and one-fine reverse flotation on the ore sample. The flotation process conditions are as follows:

[0066] Add 235g of flotation raw material to the flotation cell, add tap water (containing / without fluorine) with the pH adjusted to ~2.5, and stir for 2 minutes to fully mix. Then add (1~10)kg / t of the first flotation agent prepared above and stir for 3 minutes. Then add (1~5)kg / t of the second flotation agent prepared above, stir for 30 seconds and then perform aeration flotation. The obtained foam product is a rough feldspar concentrate. Continue to add flotation agents to the flotation cell in sequence, and the operation is the same as above. The obtained foam product is a rough feldspar concentrate. Repeat the above operation again. The obtained foam product is a rough feldspar concentrate, and the product in the flotation cell is a quartz concentrate.

[0067] The chemical composition of the product is as follows:

[0068]

[0069] Through the prepared flotation reagent and the two-sweep-one-fine reverse flotation process conditions, the SiO2 content in the quartz concentrate obtained under fluorine-containing / fluorine-free conditions is similar, both higher than 99%, meeting the standard requirements for materials used in the glass industry.

[0070] Embodiment 2:

[0071] The present embodiment provides a composite flotation agent for separating feldspar and silica sand from lithium mica tailings. The tailings of Yichun Guoxuan lithium-containing ore pre-enriched with lithium mica by flotation are used as flotation raw materials. The flotation agent is used to perform two-sweep and one-fine reverse flotation on the ore sample. The flotation process conditions are as follows:

[0072] Add 235g of flotation raw material to the flotation cell, add tap water (containing / without fluorine) with the pH adjusted to ~2.5, and stir for 2 minutes to fully mix. Then add (1~10)kg / t of the first flotation agent prepared above and stir for 3 minutes. Then add (1~5)kg / t of the second flotation agent prepared above, stir for 30 seconds and then perform aeration flotation. The obtained foam product is a rough feldspar concentrate. Continue to add flotation agents to the flotation cell in sequence, and the operation is the same as above. The obtained foam product is a rough feldspar concentrate. Repeat the above operation again. The obtained foam product is a rough feldspar concentrate, and the product in the flotation cell is a quartz concentrate.

[0073] The chemical composition of the product is as follows:

[0074] Product yield / % Element Silicon dioxide Aluminum oxide Potassium oxide Sodium oxide Iron oxide

[0075]

[0076]

[0077] Through the prepared flotation reagent and the two-sweep-one-fine reverse flotation process conditions, the SiO2 content in the quartz concentrate obtained under fluorine-containing / fluorine-free conditions is similar, both higher than 99%, meeting the standard requirements for materials used in the glass industry.

[0078] Embodiment 3:

[0079] The present embodiment provides a composite flotation agent for separating feldspar and silica sand from lithium mica tailings. The tailings after pre-enrichment of lithium mica by flotation of lithium-containing ore in Tongan, Yichun are used as flotation raw materials. The flotation agent is used to perform two-sweep and one-fine reverse flotation on the ore sample. The flotation process conditions are as follows:

[0080] Add 235g of flotation raw material to the flotation cell, add tap water (containing / without fluorine) with the pH adjusted to ~2.5, and stir for 2 minutes to fully mix. Then add (1~10)kg / t of the first flotation agent prepared above and stir for 3 minutes. Then add (1~5)kg / t of the second flotation agent prepared above, stir for 30 seconds and then perform aeration flotation. The obtained foam product is a rough feldspar concentrate. Continue to add flotation agents to the flotation cell in sequence, and the operation is the same as above. The obtained foam product is a rough feldspar concentrate. Repeat the above operation again. The obtained foam product is a rough feldspar concentrate, and the product in the flotation cell is a quartz concentrate.

[0081] The chemical composition of the product is as follows:

[0082]

[0083] Through the prepared flotation reagent and the two-sweep-one-fine reverse flotation process conditions, the SiO2 content in the quartz concentrate obtained under fluorine-containing / fluorine-free conditions is similar, both higher than 99%, meeting the standard requirements for materials used in the glass industry.

[0084] Embodiment 4:

[0085] The present embodiment provides a composite flotation agent for separating feldspar and silica sand from lithium mica tailings. The tailings of Yichun 414 mine after pre-enrichment of lithium mica by flotation of lithium ore are used as flotation raw materials. The flotation agent is used to perform two-sweep and one-fine reverse flotation on the ore sample. The flotation process conditions are as follows:

[0086] Add 235g of flotation raw material to the flotation cell, add tap water (containing / without fluorine) with the pH adjusted to ~2.5, and stir for 2 minutes to fully mix. Then add (1~10)kg / t of the first flotation agent prepared above and stir for 3 minutes. Then add (1~5)kg / t of the second flotation agent prepared above, stir for 30 seconds and then perform aeration flotation. The obtained foam product is a rough feldspar concentrate. Continue to add flotation agents to the flotation cell in sequence, and the operation is the same as above. The obtained foam product is a rough feldspar concentrate. Repeat the above operation again. The obtained foam product is a rough feldspar concentrate, and the product in the flotation cell is a quartz concentrate.

[0087] The chemical composition of the product is as follows:

[0088]

[0089]

[0090] Through the prepared flotation reagent and the two-sweep-one-fine reverse flotation process conditions, the SiO2 content in the quartz concentrate obtained under fluorine-containing / fluorine-free conditions is similar, both higher than 99%, meeting the standard requirements for materials used in the glass industry.

[0091] Embodiment 5:

[0092] The present embodiment provides a composite flotation reagent for separating feldspar and silica sand from lithium mica tailings. The tailings of lithium mica pre-enriched by flotation of lithium-containing ore in Jiuling, Yichun are used as flotation raw materials. The flotation reagent is used to perform two-sweep and one-fine reverse flotation on the ore sample. The flotation process conditions are as follows:

[0093] Add 235g of flotation raw material to the flotation cell, add tap water (containing / without fluorine) with the pH adjusted to ~2.5, and stir for 2 minutes to fully mix. Then add (1~10)kg / t of the first flotation agent prepared above and stir for 3 minutes. Then add (1~5)kg / t of the second flotation agent prepared above, stir for 30 seconds and then perform aeration flotation. The obtained foam product is a rough feldspar concentrate. Continue to add flotation agents to the flotation cell in sequence, and the operation is the same as above. The obtained foam product is a rough feldspar concentrate. Repeat the above operation again. The obtained foam product is a rough feldspar concentrate, and the product in the flotation cell is a quartz concentrate.

[0094] The chemical composition of the product is as follows:

[0095]

[0096] Through the prepared flotation reagent and the two-sweep-one-fine reverse flotation process conditions, the SiO2 content in the quartz concentrate obtained under fluorine-containing / fluorine-free conditions is similar, both higher than 99%, meeting the standard requirements for materials used in the glass industry.

[0097] Comparative Example 1:

[0098] The tailings after pre-enrichment of lithium mica by flotation of lithium-containing ore in Jiuling, Jiangxi Province were used as flotation raw materials. The first flotation agent and component 2 were added to the ore sample for two-sweep and one-fine reverse flotation. The flotation process conditions were as follows:

[0099] Add 235g of flotation raw material to the flotation cell, add tap water (containing / without fluorine) with the pH adjusted to 2.5, and stir for 2 minutes to fully mix. Then add (1-10)kg / t of the first flotation agent prepared above and (1-5)kg / t of the second flotation agent prepared above, stir for 3 minutes and then perform aeration flotation. The obtained foam product is a rough feldspar concentrate. Continue to add flotation agents to the flotation cell, and the operation is the same as above. The obtained foam product is a rough feldspar concentrate. Repeat the above operation again. The obtained foam product is a rough feldspar concentrate, and the product in the flotation cell is a quartz concentrate.

[0100] The chemical composition of the product is as follows:

[0101]

[0102] Compared with Comparative Example 1, Example 5 shows that the SiO2 content in the quartz concentrate obtained by flotation in the embodiment of the present invention is higher, indicating that the composite flotation agent and flotation method provided by the embodiment of the present invention have better separation effect on quartz and feldspar.

[0103] Comparative Example 2:

[0104] The tailings after pre-enrichment of lithium mica by flotation of lithium-containing ore in Jiuling, Jiangxi Province were used as flotation raw materials. Only the first flotation agent was added to carry out two-sweep and one-fine reverse flotation on the ore sample. The flotation process conditions were as follows:

[0105] Add 235g of flotation raw material to the flotation tank, add tap water (containing / without fluorine) with a pH adjusted to ~2.5, and stir for 2 minutes to fully mix. Then add (1~10)kg / t of the first flotation agent prepared above, stir for 3 minutes and then perform aeration flotation. The resulting foam product is a rough feldspar concentrate. Continue to add flotation reagents to the flotation tank, and the operation is the same as above. The resulting foam product is a rough feldspar concentrate. Repeat the above operation again. The resulting foam product is a rough feldspar concentrate, and the product in the flotation tank is a quartz concentrate.

[0106] The chemical composition of the product is as follows:

[0107]

[0108] Compared with Comparative Example 2, Example 5 shows that the SiO2 content in the quartz concentrate obtained by flotation in the embodiment of the present invention is higher, indicating that the composite flotation agent and flotation method provided by the embodiment of the present invention have better separation effect on quartz and feldspar.

[0109] The applicant declares that the present invention illustrates the detailed method of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed method, that is, it does not mean that the present invention must rely on the above-mentioned detailed method to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the method of the present invention, addition of auxiliary steps, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A composite flotation reagent for separating feldspar and quartz, characterized in that: The composite flotation reagent for separating feldspar and quartz comprises: The first flotation agent has a mass ratio of 20-25 parts of collector and 1-4 parts of pH adjuster; The second flotation agent has a mass ratio of 6-8 parts of inhibitor and 1-4 parts of mixed phosphate.

2. The composite flotation reagent for separating feldspar and quartz according to claim 1, characterized in that: The collector includes one or more of dodecylamine, octadecylamine, coconut amine, kerosene, mineral oil, light diesel oil, oleic acid, sodium dodecyl sulfate, and sodium dodecyl sulfonate.

3. The composite flotation reagent for separating feldspar and quartz according to claim 1, characterized in that: The pH adjuster includes one or more of sulfuric acid, nitric acid, acetic acid, and hydrochloric acid.

4. The composite flotation reagent for separating feldspar and quartz according to claim 1, characterized in that: The inhibitor includes one or more of sodium silicate, sodium hexametaphosphate, and sodium fluoride.

5. The composite flotation reagent for separating feldspar and quartz according to claim 1, characterized in that: The mixed phosphate includes one or more of disodium dihydrogen pyrophosphate, sodium tripolyphosphate, and sodium dihydrogen phosphate.

6. A flotation method for separating feldspar and quartz, characterized in that: The method comprises: placing a flotation raw material in a flotation cell, and processing an acidic aqueous solution having a pH of 2.5 into the flotation cell to form a slurry; Adding a first flotation agent into the flotation tank and stirring evenly; Adding a second flotation agent into the flotation tank and stirring evenly; Infusing the flotation tank with gas to generate bubbles; Scraping the frothed flotation tank to separate the froth product into a froth product and a tank bottom product, wherein the froth product is a feldspar coarse concentrate and the tank bottom product is a quartz concentrate; The first flotation agent and the second flotation agent are the first flotation agent and the second flotation agent of the composite flotation agent for separating feldspar and quartz according to any one of claims 1 to 5.

7. The composite flotation reagent for separating feldspar and quartz according to claim 1, characterized in that: The dosage of the first flotation agent is (1-10) kg / t.

8. The composite flotation reagent for separating feldspar and quartz according to claim 1, characterized in that: The dosage of the second flotation agent is (1-5) kg / t.

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