Waste cooking oil modified collecting agent for fluorite flotation and preparation method and application of waste cooking oil modified collecting agent

Abstract

The invention discloses a waste cooking oil modified collecting agent for fluorite flotation and a preparation method and application of the waste cooking oil modified collecting agent, and belongs to the technical field of fluorite flotation. The collecting agent comprises the following raw materials in parts by weight: 20-30 parts of waste cooking oil with the carbon chain length of 18 and the relative content of 35%-55%; 1-1.5 parts by weight of carclazyte; 2-6 parts by weight of sodium hydroxide; 2-4 parts by weight of sulfuric acid; 6 to 7 parts by weight of triethanolamine; and 1-2 parts by weight of diethyl hexyl phosphate. Starting from the research on the properties of waste cooking oil raw materials, physicochemical indexes and fatty acid component contents of different waste cooking oils are analyzed; the method for preparing the fatty acid collecting agent from the waste cooking oil is explored, the modified collecting agent for the waste cooking oil is prepared, and fluorite resources in China are fully developed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fluorite flotation, and particularly relates to a catering waste oil modified collector for fluorite flotation and a preparation method and application thereof. BACKGROUND

[0002] For a long time, the utilization of catering waste oil has been a topic of concern. Solving the utilization problem of catering waste oil as soon as possible can not only reduce environmental pollution but also turn waste into treasure, and maximize the use value of catering waste oil.

[0003] Fluorite, as an important fluorine material, is widely used in aviation, metallurgy, glass and chemical industries. As an important industrial material, fluorite has become a strategic mineral resource in various countries. The main fluorite supply countries are China and Mexico.

[0004] The most commonly used fluorite flotation collector is fatty acid. Fatty acid collectors are prepared from raw materials such as animal fat, vegetable fat, petroleum, chemical, biological processing products by-products or waste, and catering waste oil reported in recent years. Therefore, starting from the property research of catering waste oil raw materials, the physicochemical indexes and fatty acid composition content of different catering waste oils can be analyzed; the method of preparing fatty acid collectors from catering waste oil can be explored, and catering waste oil modified collectors can be prepared to fully develop China's fluorite resources.

[0005] [1] Lai J Y, Wei Y H. Performance test of phosphorite collector based on catering waste oil [J]. Nonferrous Metals (Ore Dressing Part), 2023, (05): 162-167.

[0006] [2] Zhao P, Zheng H Y, Zhang X, et al. Resource status and development suggestions of China's fluorite industry [J]. Chemical and Mineral Resources Geology, 2020, 42(02): 178-183.

[0007] [3] Yu Q Y. Preparation of collector from catering waste oil and its flotation application [D]. Zhengzhou University, 2022. DOI: 10.27466 / d.cnki.gzzdu.2022.005281. SUMMARY

[0008] In order to overcome the difficulty of fluorite recovery and the deficiency of catering waste oil utilization, the purpose of the present application is to provide a catering waste oil modified collector for floating fluorite and a preparation method and application thereof, starting from the raw material property research of catering waste oil, analyzing the physical and chemical indexes and fatty acid component content of different catering waste oils; exploring the method for preparing the fatty acid collector from the catering waste oil, preparing the catering waste oil modified collector, and fully developing the fluorite resources in China.

[0009] To solve the above technical problems, the present application adopts the following technical solutions:

[0010] The present application provides a catering waste oil modified collector for floating fluorite, which comprises the following raw materials:

[0011] The catering waste oil with a carbon chain length of 18 accounting for a relative content of 35%-55% is 20-30 parts by weight;

[0012] The white clay is 1-1.5 parts by weight;

[0013] The sodium hydroxide is 2-6 parts by weight;

[0014] The sulfuric acid is 2-4 parts by weight;

[0015] The triethanolamine is 6-7 parts by weight;

[0016] The diethylhexyl phosphate is 1-2 parts by weight.

[0017] Further, the present application provides a catering waste oil modified collector for floating fluorite, which comprises the following raw materials:

[0018] The catering waste oil with a carbon chain length of 18 accounting for a relative content of 51.55% is 2, 20 parts by weight;

[0019] The white clay is 1.5 parts by weight;

[0020] The sodium hydroxide is 4 parts by weight;

[0021] The sulfuric acid is 3 parts by weight;

[0022] The triethanolamine is 6 parts by weight;

[0023] The diethylhexyl phosphate is 1 part by weight.

[0024] The present application also provides a preparation method of the catering waste oil modified collector for floating fluorite, which is characterized by comprising the following steps:

[0025] (1) The catering waste oil with a carbon chain length of 18 accounting for a relative content of 35%-55% is taken, an equal amount of water is added, and water washing is performed by stirring, and then standing, taking the upper clear liquid, and repeating the above steps 3-5 times;

[0026] (2) The white clay is added to the water-washed catering waste oil, heated and stirred, filtered while hot, and the liquid is taken to obtain a first mixture;

[0027] (3) adding the first mixture material in step (2) into sodium hydroxide, heating and stirring to react, then separating the solid and liquid, taking the paste material to obtain a second mixture material;

[0028] (4) adding the second mixture material in step (3) into a proper amount of diluted sulfuric acid solution, stirring uniformly, then standing and separating, taking the upper liquid to obtain a third mixture material;

[0029] (5) adding the third mixture material in step (4) into a proper amount of triethanolamine, heating and stirring to react, then obtaining a fourth mixture material.

[0030] (6) adding a proper amount of diethylhexyl phosphate into the fourth mixture material in step (5), stirring uniformly, then obtaining the modified collecting agent for floating fluorite from catering waste oil.

[0031] Further, the preparation process is carried out in a reaction kettle, and the temperature and pressure in the reaction kettle are both low temperature (50-90℃) and normal pressure.

[0032] Further, in step (1), the stirring water washing time is 30-40 min, and the standing time is 30-40 min.

[0033] Further, in step (2), the heating temperature is 70-80℃, and the stirring time is 30-40 min.

[0034] Further, in step (3), the heating temperature is 70-90℃, and the stirring time is 30-40 min.

[0035] Further, in step (4), the stirring time is 1-2 h, and the standing time is 30-40 min.

[0036] Further, in step (5), the heating temperature is 50-80℃, and the stirring time is 0.5-2 h.

[0037] Further, in step (6), the stirring time is 1-2 h.

[0038] The application also provides the use of the modified collecting agent for floating fluorite from catering waste oil in floating fluorite.

[0039] Compared with the prior art, the application has the beneficial technical effects:

[0040] The application provides a catering waste oil modified collector for flotation of fluorite, raw material components include catering waste oil with a carbon chain length of 18 accounting for a relative content of 35%-55%, clay, sodium hydroxide, sulfuric acid, triethanolamine, diethylhexyl phosphate, and proper weight proportioning is conducted, in preparation, first, the catering waste oil with a carbon chain length of 18 accounting for a relative content of 35%-55% is placed, the supernatant is taken, and water washing is conducted; then, the clay is added to the supernatant for heating and stirring mixing reaction to obtain a first mixed material, then, the sodium hydroxide is added to the first mixed material for heating and stirring reaction to obtain a second mixed material, then, the sulfuric acid is added to the second mixed material for sufficient stirring reaction to obtain a third mixed material, then, the triethanolamine is added to the third mixed material for heating and stirring reaction to obtain a fourth mixed material, the solid obtained after cooling of the fourth mixed material is added to the diethylhexyl phosphate and is fully stirred, and finally, the catering waste oil modified collector for flotation of fluorite is prepared, which is easily soluble in water, has strong water solubility, has good selectivity for fluorite minerals, high collecting capacity, good stability and strong applicability when flotation operation is conducted. BRIEF DESCRIPTION OF DRAWINGS

[0041] The application will be further described below in combination with the description of the drawings.

[0042] Figure 1 It is a flow chart for the test. DETAILED DESCRIPTION

[0043] Example 1

[0044] The example provides a catering waste oil modified collector for flotation of fluorite, and raw material components are as follows:

[0045] Catering waste oil with a carbon chain length of 18 accounting for a relative content of 51.55% 2, 20 parts by weight;

[0046] Clay, 1.5 parts by weight;

[0047] Sodium hydroxide, 4 parts by weight;

[0048] Sulfuric acid, 3 parts by weight;

[0049] Triethanolamine, 6 parts by weight;

[0050] Diethylhexyl phosphate, 1 part by weight.

[0051] Further, the preparation method of the catering waste oil modified collector for flotation of fluorite includes the following steps:

[0052] (1) Stirring and washing the above-mentioned weight of catering waste oil 2 with a carbon chain length of 18 accounting for a relative content of 51.55%, and then standing for 30 min, taking the upper clear liquid, and placing it in a reaction kettle, then adding the above-mentioned weight of white clay inside, heating and stirring, the heating temperature is 80℃, and stirring for 30 min, so that the two are fully integrated, to obtain a first mixed material;

[0053] (2) The above-mentioned weight of sodium hydroxide is configured into a sodium hydroxide solution with a concentration of 20wt%, and the above-mentioned configured sodium hydroxide solution is added to the first mixed material, and then heated and stirred, the heating temperature is 80℃, and stirring for 30 min, so that the inside is fully mixed, and then solid-liquid separation is performed, to obtain a second mixed material;

[0054] (3) The above-mentioned weight of sulfuric acid is configured into a sulfuric acid solution with a concentration of 10wt%, and the above-mentioned configured sulfuric acid solution is added to the second mixed material, and then stirred for 1.5h, so that the inside is fully mixed, and then standing for 30 min to take the upper liquid, to obtain a third mixed material;

[0055] (4) The above-mentioned weight of triethanolamine is added to the third mixed material, and then heated and stirred, the heating temperature is 80℃, and stirring for 1h, so that the inside is fully mixed, to obtain a fourth mixed material;

[0056] (5) The above-mentioned weight of diethylhexyl phosphate is added to the fourth mixed material obtained in step (4), and uniformly stirred for 1h, to obtain the modified reagent for floating fluorite.

[0057] In the above preparation method, the temperature and pressure in the reaction kettle are both low temperature and normal pressure.

[0058] The modified reagent is applied in industrial test. The fluorite content in the actual mineral ore is 19.25%. In addition, other main minerals are magnetite, rare earth minerals, carbonate minerals, silicate minerals, etc. The flotation flow chart is as shown in Figure 1 The specific addition amount of each reagent in each treatment process is shown in Table 1.

[0059] Through the one rough and four fine open test of Example 1, a fluorite concentrate with a CaF2 grade of 90.71% and an operation recovery rate of 33.92% is obtained.

[0060] Example 2

[0061] This example provides a fatty acid modified reagent for floating fluorite, the raw material composition is as follows:

[0062] Catering waste oil 1 with a carbon chain length of 18 accounting for a relative content of 36.75%, 25 parts by weight;

[0063] White clay, 1 part by weight;

[0064] Sodium hydroxide, 5 parts by weight;

[0065] Sulfuric acid, 4 parts by weight;

[0066] Triethanolamine, 6 parts by weight;

[0067] Diethylhexyl phosphate, 1 part by weight.

[0068] Further, the preparation method of the restaurant waste oil modified collector for floating fluorite comprises the following steps:

[0069] (1) After the carbon chain length of 18 is 36.75% of the relative content of the restaurant waste oil 1 of the above weight is stirred and washed, it is placed for 40 min, the upper clear liquid is taken out, and it is placed in a reaction kettle. Then, the above-mentioned white clay is added inside, heated and stirred, the heating temperature is 70°C, and the stirring time is 30 min, so that the two are fully combined to obtain a first mixture;

[0070] (2) The above-mentioned sodium hydroxide is configured into a sodium hydroxide solution with a concentration of 20wt%, the above-mentioned configured sodium hydroxide solution is added to the first mixture, and then heated and stirred, the heating temperature is 75°C, and the stirring time is 30 min, so that the inside is fully mixed, and then solid-liquid separation is carried out to obtain a second mixture;

[0071] (3) The above-mentioned sulfuric acid is configured into a sulfuric acid solution with a concentration of 10wt%, the above-mentioned configured sulfuric acid solution is added to the second mixture, and then stirred for 1.5 h, so that the inside is fully mixed, and then placed for 40 min to take the upper liquid to obtain a third mixture;

[0072] (4) The above-mentioned triethanolamine is added to the third mixture, and then heated and stirred, the heating temperature is 75°C, and the stirring time is 0.5 h, so that the inside is fully mixed to obtain a fourth mixture;

[0073] (5) The above-mentioned diethylhexyl phosphate is added to the fourth mixture obtained in step (4), and then uniformly stirred for 1.5 h to obtain the restaurant waste oil modified collector for floating fluorite.

[0074] In the above preparation method, the temperature and pressure in the reaction kettle are low temperature and normal pressure.

[0075] The modified reagent is applied in industrial test. The fluorite content in the actual mineral ore is 19.25%. In addition, other main minerals are magnetite, rare earth minerals, carbonate minerals, silicate minerals, etc. The flotation flow chart is as follows Figure 1The specific addition amount of each reagent in each process is shown in Table 1.

[0076] A rough four-refined open-circuit test of Example 2 obtained a fluorite concentrate with a CaF2 grade of 82.8% and an operation recovery rate of 66.74%.

[0077] Example 3

[0078] This example provides a catering waste oil modified collector for floating fluorite, and the raw material composition is as follows:

[0079] The catering waste oil 3 with a relative content of 38.48% of carbon chain length of 18, 30 parts by weight;

[0080] White clay, 1.5 parts by weight;

[0081] Sodium hydroxide, 6 parts by weight;

[0082] Sulfuric acid, 3 parts by weight;

[0083] Triethanolamine, 7 parts by weight;

[0084] Sodium hydroxide, 3 parts by weight;

[0085] Diethylhexyl phosphate, 2 parts by weight.

[0086] Further, the preparation method of the catering waste oil modified collector for floating fluorite comprises the following steps:

[0087] (1) The catering waste oil 3 with a relative content of 38.48% of carbon chain length of 18 is stirred and washed with water, and then placed for 40 min. The upper clear liquid is taken and placed in a reaction kettle. Then the white clay is added inside, heated and stirred, the heating temperature is 70°C, and the stirring time is 40 min, so that the two are fully mixed to obtain a first mixture;

[0088] (2) The sodium hydroxide is configured into a sodium hydroxide solution with a concentration of 20wt%, and the first mixture is added with the configured sodium hydroxide solution. Then it is heated and stirred, the heating temperature is 90°C, and the stirring time is 20 min, so that the inside is fully mixed, and then solid-liquid separation is performed to obtain a second mixture;

[0089] (3) The sulfuric acid is configured into a sulfuric acid solution with a concentration of 10wt%, and the second mixture is added with the configured sulfuric acid solution, and then stirred for 2h, so that the inside is fully mixed, and then placed for 30 min to take the upper liquid to obtain a third mixture;

[0090] (4) adding the above-mentioned weight of triethanolamine to the third mixture, and heating and stirring the same, the heating temperature being 50°C, and the stirring time being 2 hours, so as to make the internal components fully mixed, thereby obtaining a fourth mixture;

[0091] (5) adding the above-mentioned weight of diethylhexyl phosphate to the fourth mixture obtained in step (4), and uniformly stirring the same for 1 hour, thereby obtaining the modified collector for floating fluorite from catering waste oil.

[0092] In the above preparation method, the temperature and pressure in the reaction kettle are low temperature and normal pressure.

[0093] The modified collector is applied in industrial test. The fluorite content in the actual mineral ore is 19.25%. In addition, other main minerals are magnetite, rare earth minerals, carbonate minerals, silicate minerals, etc. The flotation flow chart is shown in Figure 1 The specific adding amount of each reagent in each treatment process is shown in Table 1.

[0094] Through the one roughing and four cleaning open-circuit test of Example 3, fluorite concentrate with CaF2 grade of 70.36% and operation recovery rate of 61.67% is obtained.

[0095] Example 4

[0096] The present embodiment provides a modified collector for floating fluorite from catering waste oil, and the raw material composition is as follows:

[0097] The catering waste oil 4 with carbon chain length of 18 and relative content of 38.7% is 20 parts by weight;

[0098] White clay is 1.5 parts by weight;

[0099] Sodium hydroxide is 5 parts by weight;

[0100] Sulfuric acid is 2 parts by weight;

[0101] Triethanolamine is 7 parts by weight;

[0102] Diethylhexyl phosphate is 1 part by weight.

[0103] Further, the preparation method of the modified collector for floating fluorite from catering waste oil comprises the following steps:

[0104] (1) The catering waste oil 4 with carbon chain length of 18 and relative content of 38.7% is stirred and washed with water, and then is placed for 30 minutes. The upper clear liquid is taken out and placed in a reaction kettle. Then, the above-mentioned weight of white clay is added to the inside, and the same is heated and stirred, the heating temperature being 80°C, and the stirring time being 30 minutes, so as to make the two components fully mixed, thereby obtaining a first mixture;

[0105] (2) The sodium hydroxide of the above weight is configured into a sodium hydroxide solution with a concentration of 20 wt%, the above configured sodium hydroxide solution is added to the first mixture, and then heated and stirred, the heating temperature is 90°C, and the stirring time is 30 min, so that the internal mixing is sufficient, and then solid-liquid separation is performed to obtain a second mixture;

[0106] (3) The sulfuric acid of the above weight is configured into a sulfuric acid solution with a concentration of 10 wt%, the above configured sulfuric acid solution is added to the second mixture, and then stirred for 1.5 h, so that the internal mixing is sufficient, and then the upper liquid is taken after standing for 30 min to obtain a third mixture;

[0107] (4) The triethanolamine of the above weight is added to the third mixture, and then heated and stirred, the heating temperature is 70°C, and the stirring time is 1 h, so that the internal mixing is sufficient, and a fourth mixture is obtained;

[0108] (5) The diethylhexyl phosphate of the above weight is added to the fourth mixture obtained in step (4), and then uniformly stirred for 1.5 h to obtain the modified collector for floating fluorite from catering waste oil.

[0109] In the above preparation method, the temperature and pressure in the reaction kettle are low temperature and normal pressure.

[0110] The modified reagent is applied in industrial tests. The fluorite content in the actual mineral ore is 19.25%. In addition, other main minerals are magnetite, rare earth minerals, carbonate minerals, silicate minerals, etc. The flotation flow chart is as shown in Figure 1 The specific addition amount of each reagent in each treatment process is shown in Table 2.

[0111] Through the one roughing and four cleaning open-circuit test of Example 4, a fluorite concentrate with a CaF2 grade of 80.64% and an operation recovery rate of 57.8% is obtained.

[0112] Example 5

[0113] The present embodiment provides a modified collector for floating fluorite from catering waste oil, and the raw material composition is as follows:

[0114] The catering waste oil 2 with a carbon chain length of 18 accounts for a relative content of 51.55%, and the weight is 25 parts;

[0115] White clay, 1 part by weight;

[0116] Sodium hydroxide, 6 parts by weight;

[0117] Sulfuric acid, 2 parts by weight;

[0118] Triethanolamine, 7 parts by weight;

[0119] Diethylhexylphosphate, 2 parts by weight.

[0120] Further, the preparation method of the catering waste oil modified collector for floating fluorite comprises the following steps:

[0121] (1) Stirring and washing the catering waste oil 2 with a carbon chain length of 18 and a relative content of 51.55% by weight, then standing for 40 min, taking the upper clear liquid, and placing it in a reaction kettle, then adding the above-mentioned weight of white clay inside, heating and stirring, the heating temperature is 70℃, and the stirring time is 30 min, so that the two are fully mixed to obtain a first mixture;

[0122] (2) The above-mentioned weight of sodium hydroxide is configured into a sodium hydroxide solution with a concentration of 20wt%, the above-mentioned configured sodium hydroxide solution is added to the first mixture, and then heated and stirred, the heating temperature is 80℃, and the stirring time is 30 min, so that the inside is fully mixed, and then solid-liquid separation is performed to obtain a second mixture;

[0123] (3) The above-mentioned weight of sulfuric acid is configured into a sulfuric acid solution with a concentration of 10wt%, the above-mentioned configured sulfuric acid solution is added to the second mixture, and then stirred for 2h, so that the inside is fully mixed, and then standing for 30 min to take the upper liquid to obtain a third mixture;

[0124] (4) The above-mentioned weight of triethanolamine is added to the third mixture, and then heated and stirred, the heating temperature is 60℃, and the stirring time is 1h, so that the inside is fully mixed to obtain a fourth mixture;

[0125] (5) The above-mentioned weight of diethylhexylphosphate is added to the fourth mixture obtained in step (4), and uniformly stirred for 1h to obtain the catering waste oil modified collector for floating fluorite.

[0126] In the above preparation method, the temperature and pressure in the reaction kettle are both low temperature and normal pressure.

[0127] The modified reagent is applied in industrial tests. The fluorite content in the actual mineral ore is 19.25%. In addition, other main minerals are magnetite, rare earth minerals, carbonate minerals, silicate minerals, etc. The flotation flow chart is as shown in Figure 1 The specific addition amount of each reagent in each treatment process is shown in Table 2.

[0128] Through the one rough and four fine open-circuit test of Example 5, a fluorite concentrate with a CaF2 grade of 79.85% and an operation recovery rate of 52.87% is obtained.

[0129] Example 6

[0130] The embodiment provides a catering waste oil modified collector for floating fluorite, and raw material components are as follows:

[0131] The catering waste oil 1 with a relative content of 36.75% of a carbon chain length of 18 is 30 parts by weight;

[0132] The white clay is 1.5 parts by weight;

[0133] The sodium hydroxide is 6 parts by weight;

[0134] The sulfuric acid is 2 parts by weight;

[0135] The triethanolamine is 7 parts by weight;

[0136] The diethylhexyl phosphate is 2 parts by weight.

[0137] Further, the preparation method of the catering waste oil modified collector for floating fluorite comprises the following steps:

[0138] (1) The catering waste oil 1 with a relative content of 36.75% of a carbon chain length of 18 is stirred and washed with water, and then is placed for 40 min, the upper clear liquid is taken out, and is placed in a reaction kettle, then the white clay is added inside, is heated and stirred, the heating temperature is 80 DEG C, and the stirring time is 40 min, so that the two are fully combined, and a first mixture is obtained;

[0139] (2) The sodium hydroxide is configured into a sodium hydroxide solution with a concentration of 20 wt%, the first mixture is added with the configured sodium hydroxide solution, is heated and stirred again, the heating temperature is 90 DEG C, and the stirring time is 40 min, so that the inside is fully mixed, then is solid-liquid separated, and a second mixture is obtained;

[0140] (3) The sulfuric acid is configured into a sulfuric acid solution with a concentration of 10 wt%, the second mixture is added with the configured sulfuric acid solution, is stirred again, the stirring time is 2 h, so that the inside is fully mixed, then is placed for 30 min, the upper liquid is taken out, and a third mixture is obtained;

[0141] (4) The triethanolamine is added into the third mixture, is heated and stirred again, the heating temperature is 75 DEG C, and the stirring time is 1 h, so that the inside is fully mixed, and a fourth mixture is obtained;

[0142] (5) The diethylhexyl phosphate is added into the fourth mixture obtained in the step (4), is uniformly stirred, the stirring time is 2 h, and the catering waste oil modified collector for floating fluorite is obtained.

[0143] In the preparation method of each embodiment, the temperature and pressure in the reaction kettle are low temperature (60 DEG C) and normal pressure.

[0144] The modified reagents were applied in industrial tests. The actual fluorite content in the raw ore was 19.25%. In addition, other main minerals were magnetite, rare earth minerals, carbonate minerals, silicate minerals, etc. The flotation flow chart is shown in Fig. 1, and the specific reagent addition amount in each treatment process is shown in Table 1. Figure 1

[0145] The rough four-precision open test of Example 6 obtained a fluorite concentrate with a CaF2 grade of 64.76% and an operation recovery rate of 60.17%.

[0146] Table 1 - Specific reagent amount in each treatment process in the rough four-precision open test of Examples 1-3

[0147]

[0148]

[0149] Table 2 - Specific reagent amount in each treatment process in the rough four-precision open test of Examples 4-6

[0150]

[0151] The above-described examples only describe the preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art shall fall within the protection scope determined by the claims of the present application.​

Claims

1. A catering waste oil modified collector for floating fluorite, characterized in that: The raw materials include: restaurant waste oil with carbon chain length of 18 accounting for 35%-55% of relative content, 20-30 parts by weight; white clay, 1-1.5 parts by weight; sodium hydroxide, 2-6 parts by weight; sulfuric acid, 2-4 parts by weight; triethanolamine, 6-7 parts by weight; diethylhexyl phosphate, 1-2 parts by weight.

2. The restaurant waste oil modified collector for floating of fluorite according to claim 2, characterized in that: The raw materials include: restaurant waste oil with carbon chain length of 18 accounting for 51.55% of relative content, 2, 20 parts by weight; white clay, 1.5 parts by weight; sodium hydroxide, 4 parts by weight; sulfuric acid, 3 parts by weight; triethanolamine, 6 parts by weight; diethylhexyl phosphate, 1 part by weight.

3. A process for the preparation of a restaurant waste oil modified collector for floating of fluorite according to claim 1 or 2, characterized by: The steps include: (1) Take restaurant waste oil with carbon chain length of 18 accounting for 35%-55% of relative content, add an equal amount of water, stir and wash, then stand, take the upper clear liquid, and repeat the above steps 3-5 times; (2) Add white clay to the washed restaurant waste oil, heat and stir, filter while hot, take the liquid, and obtain a first mixture; (3) Add sodium hydroxide to the first mixture of step (2), heat and stir to react, then separate the solid and liquid, take the paste, and obtain a second mixture; (4) Add an appropriate amount of diluted sulfuric acid solution to the second mixture of step (3), stir evenly, stand, separate, take the upper liquid, and obtain a third mixture; (5) Add an appropriate amount of triethanolamine to the third mixture of step (4), heat and stir to react, and obtain a fourth mixture. (6) Add an appropriate amount of diethylhexyl phosphate to the fourth mixture of step (5), stir evenly, and obtain the restaurant waste oil modified collector for floating fluorite.

4. A process for the preparation of a modified collector for floating of fluorite from spent restaurant oil, according to claim 3, characterized in that: In step (1), the stirring and washing time is 30-40 min, and the standing time is 30-40 min.

5. The process for the preparation of a modified collector for floating of fluorite from spent restaurant oil as claimed in claim 3 wherein: In step (2), the heating temperature is 70-80°C, and the stirring time is 30-40 min.

6. The process for the preparation of a modified collector for floating of fluorite from spent restaurant oil as claimed in claim 3 wherein: In step (3), the heating temperature is 70-90°C, and the stirring time is 30-40 min.

7. The process for the preparation of a modified collector for floating of fluorite from spent restaurant oil as claimed in claim 3 wherein: In step (4), the stirring time is 1-2 h, and the standing time is 30-40 min.

8. The process for the preparation of a modified collector for floating of fluorite from spent restaurant oil as claimed in claim 3 wherein: In step (5), the heating temperature is 50-80°C, and the stirring time is 0.5-2 h.

9. The process for the preparation of a modified collector for floating of fluorite from restaurant waste oil as claimed in claim 3 wherein: In step (6), the stirring time is 1-2 h.

10. The restaurant waste oil modified collector for floating fluorite of claim 1 or 2 for use in the flotation of fluorite.

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