Hydroximic acid compound, preparation method, flotation agent and spodumene flotation method

Abstract

The invention discloses a hydroxamic acid compound, a preparation method, a flotation agent and a spodumene flotation method, and provides the flotation agent prepared on the basis of the hydroxamic acid compound and the flotation method for conducting flotation beneficiation on spodumene on the basis of the flotation agent. Based on the hydroxamic acid compound and the flotation method, the problems that a spodumene flotation collecting agent is single in agent, low in selectivity, not resistant to low temperature, high in foam stability and the like can be solved, and the hydroxamic acid compound can replace anion collecting agents such as sodium oleate and naphthenic soap.

Description

Technical Field

[0001] The invention relates to a hydroxamic acid compound, a preparation method, a flotation agent and a spodumene flotation method. Background Art

[0002] As the new energy industry is developing rapidly, lithium plays an irreplaceable role in the industry. Whether it is electric vehicles, solar cells, energy storage systems or even aerospace, lithium is a key factor in promoting the vigorous development of these fields.

[0003] Currently, 70% of lithium carbonate comes from lithium extraction from spodumene, so efficient utilization of spodumene resources is of great significance to the development of my country's lithium battery industry.

[0004] In the process of spodumene flotation, the selection of flotation agent is particularly important. By adding different flotation agents, the quality of the obtained products will vary greatly.

[0005] Nowadays, hydroxamic acid is widely used in other fields, but the application of hydroxamic acid in spodumene flotation is still in the development stage, and no suitable application of hydroxamic acid in spodumene flotation has been found so far. Summary of the invention

[0006] The main purpose of the present invention is to provide a hydroxamic acid compound, aiming to solve the above technical problems.

[0007] To achieve the above object, the present invention provides a hydroxamic acid compound, including a hydroxamic acid compound having the following general chemical structure formula or a chemical isomer or a salt thereof:

[0008]

[0009] in:

[0010] R 1 is a hydrocarbon group, an acyl aromatic group or a heterocyclic compound;

[0011] R 2 It is an alkane, an alkene or a benzene ring;

[0012] M is an alkali metal or hydrogen.

[0013] Furthermore, the compound is one of the following compounds:

[0014]

[0015] In addition, the present invention also provides a method for preparing a hydroxamic acid compound, the method for preparing a hydroxamic acid compound comprising:

[0016] Add compound A dropwise into the Shrek reactor and add hydroxylamine and sodium methoxide dropwise, wherein the molar ratio of compound A, hydroxylamine and sodium methoxide is 1:10:1;

[0017] After adding the raw materials, the reactor is replaced with nitrogen through a vacuum pump and a gas cylinder;

[0018] The screwed reactor is placed in a heated and rotating water bath and heated to reflux;

[0019] After the reaction is completed, wait for the reactor to cool to room temperature, open the Shrek reactor, add water to quench the reaction, and then pour it into a separatory funnel. After standing and stratifying, take the upper oil phase, repeat the extraction three times, and use to collect the oil phase;

[0020] Pour a certain concentration of dilute hydrochloric acid into the oil phase and stir to obtain a hydroxamic acid compound B;

[0021] Wherein, the chemical structure formula of the compound A is:

[0022]

[0023] The general chemical structure formula of the hydroxamic acid compound B is:

[0024]

[0025] in:

[0026] R 1 is a hydrocarbon group, an acyl aromatic group or a heterocyclic compound;

[0027] R 2 It is an alkane, an alkene or a benzene ring;

[0028] M is an alkali metal or hydrogen.

[0029] In addition, the present invention also provides a flotation agent, which comprises 40-70% of the hydroxamic acid compound B according to claim 1, 10-30% of sulfonic acids, 20-35% of amines, 5-18% of fatty acids / salts and 10-26% of alcohols.

[0030] Furthermore, the sulfonic acid includes at least one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, fatty acid methyl ester sulfonic acid and sodium olefin sulfonate.

[0031] Furthermore, the amines include at least one of dodecylamine, tetradecylamine, hexadecylamine, coconut amine, dodecyltrimethylammonium chloride and N,N-dimethylformamide.

[0032] Furthermore, the fatty acid / salt includes at least one of linoleic acid, oxidized paraffin soap, tall oil, peroxy fatty acid soap and rosin acid.

[0033] In addition, the present invention also provides a spodumene flotation method, the spodumene flotation method comprising:

[0034] Step 1: Place the spodumene ore in a ball mill and grind it to 65%-75% below 200 mesh, and collect the slurry;

[0035] Step 2: The collected slurry is passed through a magnetic separator to remove magnetic minerals to obtain magnetic concentrate;

[0036] Step 3: Add a concentration agent to the magnetic concentrate, dry and concentrate it, transfer the concentrated pulp to the flotation machine, adjust the flotation agent speed to 1800r / min, and stir the pulp in the flotation machine for 5 minutes;

[0037] Weigh 1500-2000g / t of sodium carbonate and dissolve it in water, then add the sodium carbonate solution to the slurry in small amounts and multiple times, and continue stirring;

[0038] Add the dissolved sodium hydroxide solution, and after a period of time, add 300-1000g / t of calcium chloride, and continue stirring for 10 minutes;

[0039] Step 4: slowly adding 300-800 g / t of the flotation agent described in any one of claims 4-7, stirring for 10 minutes, opening the flotation machine for roughing to obtain a roughing concentrate and a roughing tailing, adding 30-80 g / t of the flotation agent to the roughing tailing for scavenging to obtain scavenged ore and scavenged tailings, and returning the scavenged ore to the roughing for refloatation;

[0040] Step 5: adding the flotation agent 100-500g / t again to the rougher concentrate and the scavenged ore obtained by the roughing, performing the first concentration, obtaining the first concentrated middlings and the first concentrated concentrate, returning the first concentrated middlings to the roughing, performing the second concentration on the first concentrated concentrate, adding the flotation agent and stirring, then the concentrate participates in the next flotation, and the middlings return to the previous flotation operation to obtain the spodumene concentrate.

[0041] In the technical solution of the present invention, the spodumene flotation agent has high selectivity for spodumene, moderate viscosity, low temperature resistance, and moderate foam stability. It can improve the recovery rate of metallic lithium in spodumene flotation, and combined with the use of a small amount of inhibitor, the flotation yield can reach 83.6%, and the Li of the concentrate can reach 1.3%. 2 The O grade reaches 5.97. Therefore, the spodumene flotation agent provided by the present application has good selectivity, strong collection capacity, and no corrosion to equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0043] Figure 1 The figure is a schematic flow chart of a spodumene flotation method according to an embodiment of the present invention.

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in 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 protection of the present invention.

[0046] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] The invention provides a hydroxamic acid compound.

[0049] like Figure 1 As shown, the hydroxamic acid compound provided in the embodiment of the present invention is a compound having the following chemical structural formula or its chemical isomer or salt thereof:

[0050]

[0051] The specific steps of the synthesis are: dripping compound A into a Shrek reactor dropwise and adding hydroxylamine and sodium methoxide dropwise, wherein the molar ratio of compound A, hydroxylamine and sodium methoxide is 1:10:1;

[0052] After adding the raw materials, the reactor is replaced with nitrogen through a vacuum pump and a gas cylinder;

[0053] The screwed reactor is placed in a heated and rotating water bath and heated to reflux;

[0054] After the reaction is completed, wait for the reactor to cool to room temperature, open the Shrek reactor, add water to quench the reaction, and then pour it into a separatory funnel. After standing and stratifying, take the upper oil phase, repeat the extraction three times, and use to collect the oil phase;

[0055] Pour dilute hydrochloric acid of a certain concentration into the oil phase and stir to obtain a hydroxamic acid compound B.

[0056] The obtained product B was further purified and stored in a refrigerator.

[0057] The purified product B is used in the preparation of spodumene flotation agent.

[0058] Specifically, the synthetic route of hydroxamic acid compound B is as follows:

[0059]

[0060] Further, when compound A is as follows:

[0061]

[0062] The hydroxamic acid compound B generated by the above synthetic route is as follows:

[0063]

[0064] Further, when compound A is as follows:

[0065]

[0066] The hydroxamic acid compound B generated by the above synthetic route is as follows:

[0067]

[0068] Further, when compound A is as follows:

[0069]

[0070] The hydroxamic acid compound B generated by the above synthetic route is as follows:

[0071] Further, when compound A is as follows:

[0072]

[0073] The hydroxamic acid compound B generated by the above synthetic route is as follows:

[0074]

[0075] Further, when compound A is as follows:

[0076]

[0077] The hydroxamic acid compound B generated by the above synthetic route is as follows:

[0078]

[0079] In the above example:

[0080] R 1 is a hydrocarbon group, an acyl aromatic group or a heterocyclic compound;

[0081] R 2 It is an alkane, an alkene or a benzene ring;

[0082] M is an alkali metal or hydrogen.

[0083] Furthermore, the present invention provides a flotation agent, which comprises 40-70% of the hydroxamic acid compound B as claimed in claim 1, 10-30% of sulfonic acids, 20-35% of amines, 5-18% of fatty acids / salts and 10-26% of alcohols. The hydroxamic acid compound B is selected from at least one compound in the above embodiments.

[0084] Since hydroxamic acid has strong chelating ability, it can form stable chelates with metal lithium ions. The hydroxyl group in the hydroxamic acid group can form chemical bonds with metal ions on the mineral surface, and the oxygen atom can form hydrogen bonds, making the hydroxamic acid more firmly adsorbed on the mineral surface.

[0085] After the hydroxamic acid groups combine with the metal ions on the surface of spodumene, the physical and chemical properties of the mineral surface will be changed, making the hydrophobicity of the mineral surface stronger. During the flotation process, minerals with strong hydrophobicity are more likely to attach to the flotation bubbles and be taken out of the pulp, thus achieving the flotation separation of spodumene.

[0086] Hydroxamic acid itself has a certain acidity and can affect the pH value of the pulp to a certain extent. The appropriate pH value is crucial for the flotation effect of spodumene. Hydroxamic acid can help adjust the pH value of the pulp to a range suitable for spodumene flotation.

[0087] In addition to its collection effect on spodumene, hydroxamic acid can also inhibit some gangue minerals. By interacting with the ions on the surface of gangue minerals, hydroxamic acid can prevent the combination of gangue minerals and flotation reagents, thereby reducing the floating of gangue minerals and improving the selectivity of spodumene flotation.

[0088] Hydroxamic acid has strong foaming properties and can produce abundant foam during the flotation process. These foams can provide carriers for spodumene particles to attach to, making it easier for spodumene particles to be captured by flotation bubbles and taken out of the pulp. At the same time, good foaming properties can also improve the stability and efficiency of the flotation process and reduce the amount of flotation reagents used.

[0089] Optionally, the sulfonic acid includes sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, fatty acid methyl ester sulfonic acid and sodium olefin sulfonate and any combination thereof.

[0090] Optionally, the amines include dodecylamine, tetradecylamine, hexadecylamine, coconut amine, dodecyltrimethylammonium chloride and N,N-dimethylformamide and any combination thereof.

[0091] Optionally, the fatty acids / salts include linoleic acid, oxidized paraffin soap, tall oil, peroxy fatty acid soap and rosin acid.

[0092] Optionally, the alcohol is one or more combinations of methanol, ethanol, n-butanol and the like.

[0093] In the above embodiments, the different components of hydroxamic acids, sulfonic acids, amines, fatty acids / salts and alcohols mentioned can be freely combined without limitation.

[0094] Based on the above embodiments, the present application also provides a spodumene flotation method, which specifically includes:

[0095] Step 1: Place the spodumene ore in a ball mill and grind it to 65%-75% below 200 mesh, and collect the slurry;

[0096] Step 2: The collected slurry is passed through a magnetic separator to remove magnetic minerals to obtain magnetic concentrate;

[0097] Step 3: Add a concentration agent to the magnetic concentrate, dry and concentrate it, transfer the concentrated pulp to the flotation machine, adjust the flotation agent speed to 1800r / min, and stir the pulp in the flotation machine for 5 minutes;

[0098] Weigh 1500-2000g / t of sodium carbonate and dissolve it in water, then add the sodium carbonate solution to the slurry in small amounts and multiple times, and continue stirring;

[0099] Add the dissolved sodium hydroxide solution, and after a period of time, add 300-1000g / t of calcium chloride, and continue stirring for 10 minutes;

[0100] Step 4: slowly adding 300-800 g / t of the flotation agent described in any one of claims 4-7, stirring for 10 minutes, opening the flotation machine for roughing to obtain a roughing concentrate and a roughing tailing, adding 30-80 g / t of the flotation agent to the roughing tailing for scavenging to obtain scavenged ore and scavenged tailings, and returning the scavenged ore to the roughing for refloatation;

[0101] Step 5: adding the flotation agent 100-500g / t again to the rougher concentrate and the scavenged ore obtained by the roughing, performing the first concentration, obtaining the first concentrated middlings and the first concentrated concentrate, returning the first concentrated middlings to the roughing, performing the second concentration on the first concentrated concentrate, adding the flotation agent and stirring, then the concentrate participates in the next flotation, and the middlings return to the previous flotation operation to obtain the spodumene concentrate.

[0102] The present application is described below through specific embodiments.

[0103] Example 1

[0104] This embodiment is selected from spodumene ore samples from South America through testing, the original ore Li 2 O grade is 1.28% (i.e. Li 2 O content is 1.28%), a flotation method of spodumene is provided, comprising the following steps:

[0105] Step 1: Place the spodumene ore in a ball mill and grind it to 65%-75% below 200 mesh, and collect the resulting slurry.

[0106] Step 2: The collected slurry is passed through a magnetic separator to remove magnetic minerals. After removing the magnetic minerals, we obtain magnetic concentrate.

[0107] Step 3: Add the concentration agent to the magnetic concentrate from the previous step, dry and concentrate it, transfer the concentrated pulp to the flotation machine, adjust the flotation agent speed to 1800r / min, and adjust the temperature to room temperature. Stir the pulp in the flotation machine for 5 minutes. During this period, weigh 1500-2000g / t of sodium carbonate and add water to dissolve it. Add the sodium carbonate solution to the pulp in small amounts and continue stirring.

[0108] Ten minutes later, add the dissolved sodium hydroxide solution. During the process of adding the sodium hydroxide solution, the amount of sodium hydroxide solution added is determined according to the actual pH. Ten minutes after the sodium hydroxide is added, add activator calcium chloride 300-1000g / t and continue stirring for 10 minutes.

[0109] Step 4: Slowly add 300-800g / t of spodumene flotation reagent, stir for 10 minutes, then open the flotation machine for roughing to obtain roughing concentrate and roughing tailings. Add 30-80g / t of hydroxamic acid flotation reagent to the roughing tailings for scavenging, and obtain scavenging ore and scavenging tailings. The scavenged ore is returned to the roughing for refloatation.

[0110] Step 5: Add 100-500g / t of spodumene flotation reagent to the rougher concentrate and scavenged ore obtained by the rougher selection, and perform the first selection to obtain the first selection ore and the first selection concentrate. The first selection ore is returned to the rougher selection, and the first selection concentrate is subjected to the second selection. Similarly, after adding the spodumene flotation reagent, stir, and then the concentrate participates in the next flotation, and the ore returns to the previous flotation operation. Finally, we obtain spodumene concentrate H1.

[0111] According to the same ratio, when preparing the spodumene flotation reagent, hydroxamic acid is replaced with sodium oleate, and the prepared spodumene collector is flotated according to the above flotation steps. Finally, we get the spodumene concentrate H2.

[0112] According to the same ratio, when preparing the spodumene flotation reagent, hydroxamic acid is replaced with cyclohexane acid soap, and the prepared spodumene collector is used for flotation according to the above flotation steps. Finally, we get spodumene concentrate H3.

[0113] According to the same ratio, the spodumene collector containing hydroxamic acid is operated according to the above process, the original deionized water at room temperature is replaced with water at 0-10℃, and flotation is carried out according to the above flotation steps. Finally, we get spodumene concentrate H4.

[0114] The obtained spodumene concentrate H1 was dried in an oven overnight, collected and mixed, and sent for testing. The test results showed that the Li2O grade of the spodumene concentrate H1 was 5.97%, and the recovery rate reached 83.6%.

[0115] The obtained spodumene concentrate H2 was dried in an oven overnight, collected and mixed, and sent for testing. The test results showed that the Li2O grade of the spodumene concentrate H2 was 5.53%, and the recovery rate reached 70.9%.

[0116] The obtained spodumene concentrate H3 was dried in an oven overnight, collected and mixed, and sent for testing. The test results showed that the Li2O grade of the spodumene concentrate H3 was 4.66%, and the recovery rate reached 72.4%.

[0117] The obtained spodumene concentrate H4 was dried in an oven overnight, collected and mixed, and sent for testing. The test results showed that the Li2O grade of the spodumene concentrate H4 was 5.40%, and the recovery rate reached 80.4%.

[0118] The grade of the concentrate floated by the developed hydroxamic acid spodumene flotation agent is 4.69 percentage points higher than that of the original ore.

[0119] The concentrate grade and recovery rate obtained by the spodumene flotation reagent containing hydroxamic acid are higher than those obtained by the spodumene flotation reagent containing sodium oleate and cyclohexane acid soap at the same ratio.

[0120] During the flotation process of spodumene flotation reagent containing hydroxamic acid, the foam size and height are moderate, the foam fluidity and stability are good, and the scraped foam will not remain in the collector for a long time.

[0121] The spodumene flotation reagent containing hydroxamic acid can maintain a good collection effect even at low temperatures.

[0122] The hydroxamic acid-containing spodumene flotation agent has good selectivity, strong collecting ability, moderate foaming amount, and can tolerate low temperatures.

[0123] The comparison results of collector flotation concentrate grade and recovery rate of spodumene mines in South America are shown in the following table for easy viewing:

[0124]

[0125] Table 1 South American spodumene ore sample flotation statistics

[0126] Example 2

[0127] The spodumene ore sample from Africa passed the test and the ore grade was 1.61%. A spodumene flotation method was provided, which includes the following steps:

[0128] Step 1: Place the spodumene ore in a ball mill and grind it to 65%-75% below 200 mesh, and collect the resulting slurry.

[0129] Step 2: The collected slurry is passed through a magnetic separator to remove magnetic minerals. After the magnetic minerals are removed, a magnetic concentrate is obtained.

[0130] Step 3: Add the concentration agent to the magnetic concentrate from the previous step, dry and concentrate it, transfer the concentrated pulp to the flotation machine, adjust the flotation agent speed to 1800r / min, and adjust the temperature to room temperature. Stir the pulp in the flotation machine for 5 minutes. During this period, weigh 1500-2000g / t of sodium carbonate and add water to dissolve it. Add the sodium carbonate solution to the pulp in small amounts and continue stirring.

[0131] After ten minutes, add 200-1000g / t of the dissolved sodium hydroxide solution. After ten minutes, add 300-1000g / t of calcium chloride as an activator and continue stirring for 10 minutes.

[0132] Step 4: Slowly add 300-800g / t of spodumene flotation reagent containing hydroxamic acid, stir for 10 minutes, and then open the flotation machine for roughing to obtain roughing concentrate and roughing tailings. Add 30-80g / t of spodumene flotation reagent containing hydroxamic acid to the roughing tailings for scavenging to obtain scavenged ore and scavenged tailings. The scavenged ore is returned to the roughing for refloatation.

[0133] Step 5: Add 100-500g / t of hydroxamic acid-containing spodumene flotation reagent to the roughing concentrate and the scavenged ore for the first concentration to obtain the first concentrated ore and the first concentrated concentrate. The first concentrated ore is returned to the roughing, and the first concentrated concentrate is subjected to the second concentration. Similarly, after adding the hydroxamic acid-containing spodumene flotation reagent and stirring, the concentrate participates in the next flotation, and the ore returns to the previous flotation operation. Finally, we obtain spodumene concentrate K1.

[0134] According to the same proportion, the synthesized hydroxamic acid is not added when the flotation reagent is prepared, and the hydroxamic acid is replaced with sodium oleate in the same proportion, and the obtained spodumene flotation reagent is flotated according to the above flotation steps. Finally, we get spodumene concentrate K2.

[0135] According to the same proportion, the synthesized hydroxamic acid is not added when the flotation reagent is prepared, and the hydroxamic acid is replaced by cyclohexane acid soap in the same proportion, and the obtained spodumene flotation reagent is flotated according to the above flotation steps. Finally, we get spodumene concentrate K3.

[0136] According to the same ratio, the water temperature in the flotation agent is adjusted to 0-10℃, and flotation is carried out according to the above flotation steps. Finally, we get spodumene concentrate K4.

[0137] The obtained spodumene concentrate K1 was dried in an oven overnight, collected and mixed, and sent for testing. The test results showed that the Li2O grade of the spodumene concentrate K1 was 6.13%, and the recovery rate reached 81.4%.

[0138] The obtained spodumene concentrate K2 was dried in an oven overnight, collected and mixed, and sent for testing. The test results showed that the Li2O grade of the spodumene concentrate K2 was 5.47%, and the recovery rate reached 77.3%.

[0139] The obtained spodumene concentrate K3 was dried in an oven overnight, collected and mixed, and sent for testing. The test results showed that the Li2O grade of the spodumene concentrate K3 was 5.03%, and the recovery rate reached 71.4%.

[0140] The obtained spodumene concentrate K4 was dried in an oven overnight, collected and mixed, and sent for testing. The test results showed that the Li2O grade of the spodumene concentrate K4 was 5.95%, and the recovery rate reached 80.1%.

[0141] The grade of the concentrate floated by the spodumene flotation agent containing hydroxamic acid spodumene is 4.52 percentage points higher than the grade of the original ore.

[0142] The comparison results of the collector flotation concentrate grade and recovery rate of African spodumene mines are shown in the following table for easy viewing:

[0143]

[0144] Table 2 Statistics of flotation of African spodumene ore samples

[0145] In summary, compared with oleic acid and cyclopentane acid soap collectors in the same proportion, the hydroxamic acid spodumene flotation reagent provided in the present application has better selectivity for spodumene and stronger collection ability.

[0146] The hydroxamic acid-containing spodumene flotation reagent provided in the present application has a stable flotation foam effect and can achieve a good recovery rate for spodumene ores in different regions.

[0147] In summary, the flotation reagent of spodumene containing hydroxamic acid is superior to oleic acid and cyclohexane acid soaps, and the flotation reagent of spodumene containing hydroxamic acid can withstand low temperatures.

[0148] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A hydroxamic acid compound, characterized in that: The hydroxamic acid compound is a compound having the following general chemical structure or a chemical isomer or a salt thereof: in: R1 is a hydrocarbon group, an acyl aromatic group or a heterocyclic compound; R2 is an alkane, an alkene or a benzene ring; M is an alkali metal or hydrogen.

2. The hydroxamic acid compound according to claim 1, characterized in that The compound is one of the following compounds:

3. A method for preparing a hydroxamic acid compound, characterized in that: The method for preparing the hydroxamic acid compound comprises: Add compound A dropwise into the Shrek reactor and add hydroxylamine and sodium methoxide dropwise, wherein the molar ratio of compound A, hydroxylamine and sodium methoxide is 1:10:1; After adding the raw materials, the reactor is replaced with nitrogen through a vacuum pump and a gas cylinder; The screwed reactor is placed in a heated and rotating water bath and heated to reflux; After the reaction is completed, wait for the reactor to cool to room temperature, open the Shrek reactor, add water to quench the reaction, and then pour it into a separatory funnel. After standing and stratifying, take the upper oil phase, repeat the extraction three times, and use to collect the oil phase; Pour a certain concentration of dilute hydrochloric acid into the oil phase and stir to obtain a hydroxamic acid compound B; Wherein, the chemical structure formula of the compound A is: The general chemical structure formula of the hydroxamic acid compound B is: in: R1 is a hydrocarbon group, an acyl aromatic group or a heterocyclic compound; R2 is an alkane, an alkene or a benzene ring; M is an alkali metal or hydrogen.

4. A flotation agent, characterized in that: The flotation agent comprises 40-70% of the hydroxamic acid compound B as claimed in claim 1, 10-30% of sulfonic acids, 20-35% of amines, 5-18% of fatty acids / salts and 10-26% of alcohols.

5. The flotation agent according to claim 4, characterized in that The sulfonic acid includes at least one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, fatty acid methyl ester sulfonic acid and sodium olefin sulfonate.

6. The flotation agent according to claim 4, characterized in that The amines include at least one of dodecylamine, tetradecylamine, hexadecylamine, coconut amine, dodecyltrimethylammonium chloride and N,N-dimethylformamide.

7. The flotation agent according to claim 4, characterized in that The fatty acid / salt includes at least one of linoleic acid, oxidized paraffin soap, tall oil, peroxy fatty acid soap and rosin acid.

8. A spodumene flotation method, characterized in that: The spodumene flotation method comprises: Step 1: Place the spodumene ore in a ball mill and grind it to 65%-75% below 200 mesh, and collect the slurry; Step 2: The collected slurry is passed through a magnetic separator to remove magnetic minerals to obtain magnetic concentrate; Step 3: Add a concentration agent to the magnetic concentrate, dry and concentrate it, transfer the concentrated pulp to the flotation machine, adjust the flotation agent speed to 1800r / min, and stir the pulp in the flotation machine for 5 minutes; Weigh 1500-2000g / t of sodium carbonate and dissolve it in water, then add the sodium carbonate solution to the slurry in small amounts and multiple times, and continue stirring; Add the dissolved sodium hydroxide solution, and after a period of time, add 300-1000g / t of calcium chloride, and continue stirring for 10 minutes; Step 4: slowly adding 300-800 g / t of the flotation agent described in any one of claims 4-7, stirring for 10 minutes, opening the flotation machine for roughing to obtain a roughing concentrate and a roughing tailing, adding 30-80 g / t of the flotation agent to the roughing tailing for scavenging to obtain scavenged ore and scavenged tailings, and returning the scavenged ore to the roughing for refloatation; Step 5: adding the flotation agent 100-500g / t again to the rougher concentrate and the scavenged ore obtained by the roughing, performing the first concentration, obtaining the first concentrated middlings and the first concentrated concentrate, returning the first concentrated middlings to the roughing, performing the second concentration on the first concentrated concentrate, adding the flotation agent and stirring, then the concentrate participates in the next flotation, and the middlings return to the previous flotation operation to obtain the spodumene concentrate.

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