A method for recycling waste antifreeze liquid of hydraulic support

Abstract

The present invention discloses a method for recycling and reusing waste antifreeze fluid from hydraulic supports, comprising the following steps: S1, filtering the waste antifreeze fluid from the hydraulic supports step by step to obtain a filtrate; S2, adding an additive to the filtrate, stirring and mixing, and obtaining a new antifreeze fluid product for the hydraulic supports. In step S2, the additive comprises the following components in parts by weight: 12 to 22 parts antifreeze; 0.3 to 0.9 parts lubricant; 2 to 4 parts pH adjuster; 0.5 to 1 part composite corrosion inhibitor; 0.5 to 1.5 parts stabilizer; and 0.03 to 0.09 parts defoamer. The present invention reduces the discharge of waste antifreeze fluid from hydraulic supports while achieving recycling and reuse. The recycled and reprocessed antifreeze fluid for hydraulic supports can meet antifreeze requirements in different regions while exhibiting good stability, lubricity, and corrosion resistance.

Description

Technical Field

[0001] This invention belongs to the field of antifreeze and transmission medium for hydraulic supports. Specifically, this invention relates to a method for recycling and reusing waste antifreeze for hydraulic supports. Background Technology

[0002] Hydraulic support antifreeze is a hydraulic fluid used to prevent freezing of hydraulic equipment such as hydraulic supports and externally injected single hydraulic props during surface storage, well maintenance, and factory transportation in cold seasons. In addition to preventing freezing, it also provides lubrication and rust prevention, effectively protecting the hydraulic system. Hydraulic support antifreeze is generally composed of water, antifreeze agents, rust inhibitors, corrosion inhibitors, lubricants, and other additives. The hydraulic support antifreeze is added directly to the hydraulic support through a pump station system.

[0003] MT / T 1192-2020 "Antifreeze for Hydraulic Supports" classifies products into 8 grades according to their freezing point, with grade codes of 25, 30, 35, 40, 45, 50, 55, and 60 respectively; for example, YFD-40 indicates antifreeze for hydraulic supports with a freezing point below -40℃.

[0004] Every winter, to prevent vulnerable components such as pipelines and valves of hydraulic supports exposed to the elements from freezing, coal mines or hydraulic support manufacturers typically replace emulsion fluid with antifreeze. Due to variations in the model and quantity of different hydraulic supports, the amount of antifreeze used ranges from several tons to tens of tons. A certain amount of waste antifreeze is generated during the filling or replacement process. Waste antifreeze cannot be directly discharged, and its treatment or disposal costs are relatively high. Waste antifreeze has the following characteristics:

[0005] 1) It mainly consists of antifreeze, and also contains corrosion inhibitors of different metals.

[0006] 2) The use of clean water during pipeline cleaning caused the antifreeze to have an excessively high freezing point, which could not meet the local temperature requirements.

[0007] 3) Some antifreeze may become cloudy, precipitate, or have precipitates due to contamination (mixed with a certain amount of emulsion or incompatible liquid).

[0008] 4) Some antifreeze is past its expiration date and its performance does not meet the standard requirements.

[0009] Therefore, there is an urgent need for a technology to reduce the volume of waste antifreeze, preferably one that can be disposed of and utilized locally to reduce packaging and transportation costs. This leads to the consideration of recycling and reusing the waste antifreeze from hydraulic supports in coal mines, while also allowing for more flexible adjustment of the antifreeze level during production and use. Summary of the Invention

[0010] In view of this, the purpose of this invention is to provide a method for recycling and reusing antifreeze waste liquid from hydraulic supports.

[0011] This invention provides a method for recycling and reusing waste antifreeze from hydraulic supports, comprising the following steps:

[0012] S1, the antifreeze waste liquid of the hydraulic support is filtered step by step to obtain filtrate;

[0013] S2, Add additives to the filtrate, stir and mix to obtain a new hydraulic support antifreeze product;

[0014] In step S2, the additive is made from the following components in parts by weight: 12-22 parts antifreeze; 0.3-0.9 parts lubricant; 2-4 parts pH adjuster; 0.5-1 part composite corrosion inhibitor; 0.5-1.5 parts stabilizer; and 0.03-0.09 parts defoamer.

[0015] The embodiments of the present invention not only reduce the discharge of antifreeze waste liquid from hydraulic supports and lower its disposal costs, but also enable the recycling and reuse of antifreeze waste liquid from hydraulic supports, turning waste into treasure. Moreover, the recycled and reprocessed antifreeze liquid from hydraulic supports can meet the antifreeze requirements of different regions, and has good stability, lubricity and corrosion resistance.

[0016] In some embodiments, the step-by-step filtration process involves sequentially using a polypropylene needle-punched felt filter bag, oil-absorbing cotton, and an activated carbon fiber pleated filter cartridge.

[0017] And / or, the pore size of the polypropylene needle-punched felt filter bag is 25 μm; the pore size of the activated carbon fiber pleated filter element is 5 μm;

[0018] The oil-absorbing cotton is made of 100% polypropylene; oil absorption ratio: ≥20 times for oils; oil immersion speed: less than 1 minute; post-treatment incineration ash content is less than 0.02%; environmentally friendly, non-toxic and pollution-free.

[0019] In some embodiments, the mass ratio of the filtrate to the additive is (70-90):(10-30).

[0020] In some embodiments, the antifreeze includes at least one selected from ethylene glycol, 1,2-propanediol, 1,3-propanediol, and diethylene glycol.

[0021] In some embodiments, the lubricant is a mixture of sodium C16-C18 fatty acid methyl ester sulfonate and sodium oleoyl N-methyl taurate, wherein the mass ratio of sodium C16-C18 fatty acid methyl ester sulfonate to sodium oleoyl N-methyl taurate is (1-3):1.

[0022] In some embodiments, the pH adjuster is a mixture of sodium tetraborate and sodium citrate, wherein the mass ratio of sodium tetraborate to sodium citrate is 1:(1-2).

[0023] In some embodiments, the composite corrosion inhibitor is made from components comprising the following parts by weight: 0.2 to 0.6 parts of sodium mercaptobenzothiazole, 2 to 7 parts of sodium benzoate, 1 to 6 parts of sodium polyaspartate, and 3 to 8 parts of hydrolyzed polymaleic anhydride.

[0024] In some embodiments, the stabilizer is a mixture of mannitol and Pluronic PE 8100, wherein the mass ratio of mannitol to Pluronic PE 8100 is (1-3):(1-2).

[0025] In some embodiments, the defoamer is a fluorosilicone polyether defoamer.

[0026] In some embodiments, the mixing time is 20 min to 40 min. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0028] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0029] In this document, when values ​​are described as ranges, it should be understood that such disclosure includes disclosure of all possible subranges within that range, as well as the specific numerical values ​​falling within that range, regardless of whether the specific numerical value or specific subrange is explicitly specified.

[0030] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three kinds of relationships. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone.

[0031] This invention provides a method for recycling and reusing waste antifreeze from hydraulic supports, comprising the following steps:

[0032] S1, the antifreeze waste liquid of the hydraulic support is filtered step by step to obtain filtrate;

[0033] S2, Add additives to the filtrate, stir and mix to obtain a new hydraulic support antifreeze product;

[0034] In step S2, the additive is made from the following components in parts by weight: 12-22 parts antifreeze; 0.3-0.9 parts lubricant; 2-4 parts pH adjuster; 0.5-1 part composite corrosion inhibitor; 0.5-1.5 parts stabilizer; and 0.03-0.09 parts defoamer.

[0035] In some specific embodiments, the step-by-step filtration process involves sequentially using polypropylene needle-punched felt filter bags, oil-absorbing cotton, and activated carbon fiber pleated filter cartridges. The polypropylene needle-punched felt filter bags primarily remove relatively large rust residues, wear debris, precipitates, and mixed impurities. The oil-absorbing cotton primarily removes mixed machine oil or precipitated oily soaps. The activated carbon fiber pleated filter cartridges primarily remove tiny suspended solids and also have decolorizing and deodorizing effects.

[0036] Furthermore, the pore size of the polypropylene needle-punched felt filter bag is 25 μm; the pore size of the activated carbon fiber pleated filter element is 5 μm.

[0037] The oil-absorbing cotton is made of 100% polypropylene; oil absorption ratio: ≥20 times; oil immersion speed: less than 1 minute; post-treatment incineration ash content is less than 0.02%; environmentally friendly, non-toxic and pollution-free.

[0038] In some specific embodiments, the mass ratio of filtrate to additive is (70-90):(10-30), with non-limiting examples such as 70:30, 75:25, 78.05:21.95, 80:20, 84.67:15.33, and 90:10. It should be noted that the mass ratio of filtrate to additive is mainly affected by the freezing point of the filtrate and the freezing point of the target antifreeze. The specific ratio can be adjusted according to the characteristics of the filtrate and the type of target antifreeze.

[0039] In some specific embodiments, the antifreeze includes at least one of ethylene glycol, 1,2-propanediol, 1,3-propanediol, and diethylene glycol.

[0040] In some specific embodiments, the lubricant is a mixture of sodium C16-C18 fatty acid methyl ester sulfonate and sodium oleoyl N-methyl taurate, and the mass ratio of sodium C16-C18 fatty acid methyl ester sulfonate to sodium oleoyl N-methyl taurate is (1-3):1, with non-limiting examples such as 1:1, 1.5:1, 2:1, 3:1, etc. The inventors have found that sodium C16-C18 fatty acid methyl ester sulfonate has the advantages of strong resistance to hard water and biodegradability; sodium oleoyl N-methyl taurate has a cleaning effect and low skin irritation. Therefore, this application uses a mixture of sodium C16-C18 fatty acid methyl ester sulfonate and sodium oleoyl N-methyl taurate as a lubricant, which can improve the adaptability of hydraulic support antifreeze to water quality, and the lubricant also has a cleaning effect on the inside of the hydraulic support, and it has low skin irritation and high environmental friendliness during use.

[0041] In some specific embodiments, the pH adjuster is a mixture of sodium tetraborate and sodium citrate, and the mass ratio of sodium tetraborate to sodium citrate is 1:(1-2), with non-limiting examples such as 1:1, 1:1.5, 1:1.8, 1:2, etc. Since both sodium tetraborate and sodium citrate are polybasic weak acid-strong base salts, they can react with hydrogen ions and hydroxide ions in water, thereby stabilizing the pH of the entire system. Therefore, this application selects a mixture of sodium tetraborate and sodium citrate as the pH adjuster.

[0042] In some specific embodiments, the composite corrosion inhibitor is made from the following components in parts by weight: 0.2 to 0.6 parts of sodium mercaptobenzothiazole, 2 to 7 parts of sodium benzoate, 1 to 6 parts of sodium polyaspartate, and 3 to 8 parts of hydrolyzed polymaleic anhydride.

[0043] The embodiments of the present invention fully consider the comprehensive rust and corrosion prevention capabilities of ferrous and non-ferrous metals used in hydraulic supports. Therefore, by optimizing the composition and ratio of the composite corrosion inhibitor, the rust and corrosion prevention performance of the antifreeze of the hydraulic support is improved, and the composition of the above-mentioned composite corrosion inhibitor is relatively green and environmentally friendly.

[0044] In some specific embodiments, the stabilizer is a mixture of mannitol and Pluronic PE 8100, and the mass ratio of mannitol to Pluronic PE 8100 is (1-3):(1-2), with non-limiting examples such as 1:1, 1:2, 2:1, 3:1, 3:2, etc. The inventors have found that mannitol has emulsifying and dispersing effects, is gentle on the human body, and has a relatively small impact on the environment; Pluronic PE 8100 has anti-hard water and cleaning properties. Therefore, this application selects a mixture of mannitol and Pluronic PE 8100 as the stabilizer.

[0045] In some specific embodiments, the defoamer is a fluorosilicone polyether defoamer.

[0046] In some specific embodiments, the mixing time is 20 min to 40 min, and non-limiting examples include 20 min, 25 min, 30 min, 40 min, etc.

[0047] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. The following embodiments use conventional instruments and equipment in the art. Experimental methods not specifically described in the embodiments are conventional methods and conditions well known in the art, or methods and conditions recommended by the manufacturer. Unless otherwise stated, all raw materials used in the following embodiments are conventional commercially available products, or can be prepared by known methods.

[0048] Example 1

[0049] This embodiment provides a method for recycling and reusing antifreeze waste fluid from hydraulic supports, including the following steps:

[0050] S1. Using the waste liquid of antifreeze for hydraulic supports of No. 1 coal mine (YFD-40 type antifreeze for hydraulic supports) as raw material, the waste liquid is filtered step by step using a polypropylene needle-punched felt filter bag with a pore size of 25μm, oil-absorbing cotton and activated carbon fiber pleated filter element with a pore size of 5μm to obtain filtrate.

[0051] S2, add 28.99 parts by weight of additive to 71.01 parts by weight of filtrate, and stir and mix using an emulsion pump from the equipment repair shop. After stirring and mixing for 40 minutes, the mixture is uniform and clear, thus obtaining the new YFD-40 hydraulic support antifreeze product, designated as Antifreeze No. I.

[0052] In this embodiment, in step S2, the additive is made from the following components in parts by weight: 22 parts antifreeze; 0.9 parts lubricant; 4 parts pH adjuster; 1 part composite corrosion inhibitor; 1 part stabilizer; and 0.09 parts defoamer.

[0053] The antifreeze agent is ethylene glycol;

[0054] The lubricant is prepared by mixing sodium C16-C18 fatty acid methyl ester sulfonate and sodium oleoyl N-methyl taurate in a mass ratio of 3:1.

[0055] The pH adjuster is prepared by mixing sodium tetraborate and sodium citrate in a mass ratio of 1:1.

[0056] The composite corrosion inhibitor was prepared by mixing 0.6 parts of sodium mercaptobenzothiazole, 7 parts of sodium benzoate, 6 parts of sodium polyaspartate and 8 parts of hydrolyzed polymaleic anhydride.

[0057] The stabilizer was prepared by mixing mannitol and Pluronic PE 8100 in a mass ratio of 3:1;

[0058] The defoamer is a fluorosilicone polyether defoamer.

[0059] According to MT / T 1192-2020 "Antifreeze for Hydraulic Supports", the filtrate of the waste liquid of antifreeze for No. 1 coal mine hydraulic support (YFD-40 type antifreeze for hydraulic support) and the prepared antifreeze No. I were subjected to comprehensive performance tests. The test results are shown in Table 1.

[0060] Table 1

[0061]

[0062]

[0063] Example 2

[0064] This embodiment provides a method for recycling and reusing antifreeze waste fluid from hydraulic supports, including the following steps:

[0065] S1. Using the waste liquid of antifreeze for hydraulic supports of No. 2 coal mine (YFD-40 type antifreeze for hydraulic supports) as raw material, the waste liquid is filtered step by step using a polypropylene needle-punched felt filter bag with a pore size of 25μm, oil-absorbing cotton, and activated carbon fiber pleated filter element with a pore size of 5μm to obtain filtrate.

[0066] S2, add 21.95 parts by weight of additive to 78.05 parts by weight of filtrate, and stir and mix using an emulsion pump from the equipment repair shop. After stirring and mixing for 30 minutes, the mixture is uniform and clear, thus obtaining the new YFD-40 hydraulic support antifreeze product, designated as Antifreeze No. II.

[0067] In this embodiment, in step S2, the additive is made from the following components in parts by weight: 17 parts antifreeze; 0.6 parts lubricant; 2 parts pH adjuster; 0.8 parts composite corrosion inhibitor; 1.5 parts stabilizer; and 0.05 parts defoamer.

[0068] The antifreeze agent is ethylene glycol;

[0069] The lubricant is prepared by mixing sodium C16-C18 fatty acid methyl ester sulfonate and sodium oleoyl N-methyl taurate in a mass ratio of 1:1.

[0070] The pH adjuster is prepared by mixing sodium tetraborate and sodium citrate in a mass ratio of 1:2.

[0071] The composite corrosion inhibitor is prepared by mixing 0.6 parts of sodium mercaptobenzothiazole, 2 parts of sodium benzoate, 1 part of sodium polyaspartate and 3 parts of hydrolyzed polymaleic anhydride;

[0072] The stabilizer was prepared by mixing mannitol and Pluronic PE 8100 in a mass ratio of 1:2;

[0073] The defoamer is a fluorosilicone polyether defoamer.

[0074] According to MT / T 1192-2020 "Antifreeze for Hydraulic Supports", the filtrate of the waste liquid of antifreeze for No. 2 coal mine hydraulic support (YFD-40 type antifreeze) and the prepared antifreeze No. II were subjected to comprehensive performance tests. The test results are shown in Table 2.

[0075] Table 2

[0076]

[0077]

[0078] Example 3

[0079] This embodiment provides a method for recycling and reusing antifreeze waste fluid from hydraulic supports, including the following steps:

[0080] S1, using the waste liquid of antifreeze for hydraulic supports of No. 3 coal mine (YFD-40 type antifreeze for hydraulic supports) as raw material, the waste liquid is filtered step by step using a polypropylene needle-punched felt filter bag with a pore size of 25μm, oil-absorbing cotton and activated carbon fiber pleated filter element with a pore size of 5μm to obtain filtrate;

[0081] S2, add 15.33 parts by weight of additive to 84.67 parts by weight of filtrate, and stir and mix using an emulsion pump from the equipment repair shop. After stirring and mixing for 20 minutes, the mixture is uniform and clear, thus obtaining the new YFD-40 hydraulic support antifreeze product, designated as Antifreeze No. III.

[0082] In this embodiment, in step S2, the additive is made from components comprising the following parts by weight: 12 parts antifreeze; 0.3 parts lubricant; 2 parts pH adjuster; 0.5 parts composite corrosion inhibitor; 0.5 parts stabilizer; and 0.03 parts defoamer.

[0083] The antifreeze agent is ethylene glycol;

[0084] The lubricant is prepared by mixing sodium C16-C18 fatty acid methyl ester sulfonate and sodium oleoyl N-methyl taurate in a mass ratio of 1:1.

[0085] The pH adjuster is prepared by mixing sodium tetraborate and sodium citrate in a mass ratio of 1:1.

[0086] The composite corrosion inhibitor is prepared by mixing 0.2 parts of sodium mercaptobenzothiazole, 2 parts of sodium benzoate, 1 part of sodium polyaspartate and 6 parts of hydrolyzed polymaleic anhydride;

[0087] The stabilizer was prepared by mixing mannitol and Pluronic PE 8100 in a mass ratio of 2:1;

[0088] The defoamer is a fluorosilicone polyether defoamer.

[0089] According to MT / T 1192-2020 "Antifreeze for Hydraulic Supports", the filtrate of the waste liquid of antifreeze for No. 3 coal mine hydraulic support (YFD-40 type antifreeze) and the prepared antifreeze No. III were subjected to comprehensive performance tests. The test results are shown in Table 3.

[0090] Table 3

[0091]

[0092]

[0093] Comparative Example 1

[0094] This comparative example provides a method for recycling and reusing antifreeze waste fluid from hydraulic supports, including the following steps:

[0095] S1. Using the waste liquid of antifreeze for hydraulic supports of No. 1 coal mine (YFD-40 type antifreeze for hydraulic supports) as raw material, the waste liquid is filtered step by step using a polypropylene needle-punched felt filter bag with a pore size of 25μm, oil-absorbing cotton and activated carbon fiber pleated filter element with a pore size of 5μm to obtain filtrate.

[0096] S2, add 28.99 parts by weight of additive to 71.01 parts by weight of filtrate, and stir and mix using an emulsion pump from the equipment repair shop. After stirring and mixing for 40 minutes, the mixture is uniform and clear, thus obtaining the new YFD-40 hydraulic support antifreeze product, designated as Antifreeze No. IV.

[0097] In this embodiment, in step S2, the additive is made from the following components in parts by weight: 22 parts antifreeze; 0.9 parts lubricant; 4 parts pH adjuster; 1 part composite corrosion inhibitor; 1 part stabilizer; and 0.09 parts defoamer.

[0098] The antifreeze agent is ethylene glycol;

[0099] The lubricant is triethanolamine oleate;

[0100] The pH adjuster is prepared by mixing sodium tetraborate and sodium citrate in a mass ratio of 1:1.

[0101] The composite corrosion inhibitor was prepared by mixing 0.6 parts of sodium mercaptobenzothiazole, 7 parts of sodium benzoate, 6 parts of sodium polyaspartate and 8 parts of hydrolyzed polymaleic anhydride.

[0102] The stabilizer was prepared by mixing mannitol and Pluronic PE 8100 in a mass ratio of 3:1;

[0103] The defoamer is a fluorosilicone polyether defoamer.

[0104] According to MT / T 1192-2020 "Antifreeze for Hydraulic Supports", the comprehensive performance of antifreeze No. IV was tested, and the test results are shown in Table 4.

[0105] Table 4

[0106]

[0107]

[0108] By comparing Tables 1 and 4, it can be seen that, compared with Antifreeze No. IV prepared by Comparative Example 1 using triethanolamine oleate as a lubricant, Antifreeze No. I obtained by Example 1 of the present invention using a mixture of sodium methyl ester sulfonate of C16-C18 fatty acids and sodium oleoyl N-methyl taurate as a lubricant has better thermal stability, low temperature stability and lubricity. This shows that the lubricant used in the embodiment of the present invention has strong resistance to high and low temperatures and has better lubricity.

[0109] Comparative Example 2

[0110] This comparative example provides a method for recycling and reusing antifreeze waste fluid from hydraulic supports, including the following steps:

[0111] S1. Using the waste liquid of antifreeze for hydraulic supports of No. 1 coal mine (YFD-40 type antifreeze for hydraulic supports) as raw material, the waste liquid is filtered step by step using a polypropylene needle-punched felt filter bag with a pore size of 25μm, oil-absorbing cotton and activated carbon fiber pleated filter element with a pore size of 5μm to obtain filtrate.

[0112] S2, add 28.99 parts by weight of additive to 71.01 parts by weight of filtrate, and stir and mix using an emulsion pump from the equipment repair shop. After stirring and mixing for 40 minutes, the mixture is uniform and clear, thus obtaining the new YFD-40 hydraulic support antifreeze product, designated as Antifreeze No. V.

[0113] In this embodiment, in step S2, the additive is made from the following components in parts by weight: 22 parts antifreeze; 0.9 parts lubricant; 4 parts pH adjuster; 1 part composite corrosion inhibitor; 1 part stabilizer; and 0.09 parts defoamer.

[0114] The antifreeze agent is ethylene glycol;

[0115] The lubricant is prepared by mixing sodium C16-C18 fatty acid methyl ester sulfonate and sodium oleoyl N-methyl taurate in a mass ratio of 3:1.

[0116] The pH adjuster is prepared by mixing sodium tetraborate and sodium citrate in a mass ratio of 1:1.

[0117] The composite corrosion inhibitor was prepared by mixing 0.6 parts of sodium mercaptobenzothiazole, 7 parts of sodium molybdate, 6 parts of sodium carbonate and 8 parts of carbamide;

[0118] The stabilizer was prepared by mixing mannitol and Pluronic PE 8100 in a mass ratio of 3:1;

[0119] The defoamer is a fluorosilicone polyether defoamer.

[0120] According to MT / T 1192-2020 "Antifreeze for Hydraulic Supports", the comprehensive performance of antifreeze No. V was tested, and the test results are shown in Table 5.

[0121] Table 5

[0122]

[0123]

[0124] By comparing Tables 1 and 5, it can be seen that, compared with Comparative Example 2, the antifreeze No. I obtained in Example 1 of the present invention has better corrosion resistance and thermal stability, which further reflects that the composite corrosion inhibitor used in the embodiment of the present invention has better corrosion inhibition performance, thereby improving the corrosion resistance and thermal stability of the antifreeze.

[0125] This invention relates to the preparation of new antifreeze products by recycling waste antifreeze from hydraulic supports. This not only achieves the recycling of waste antifreeze in coal mines, thus saving energy and reducing consumption, but also saves the cost of outsourcing the disposal of waste antifreeze to professional organizations. Furthermore, the method has a simple processing technology, allowing for on-site processing and production. Compared to conventional antifreeze, it can reduce packaging and transportation costs by more than 70%, significantly lowering the production cost of antifreeze. Additionally, the ratio of antifreeze agent to waste antifreeze filtrate can be flexibly adjusted according to on-site climate conditions to modify the antifreeze level, allowing for immediate use after preparation. Moreover, the antifreeze product prepared using waste antifreeze from hydraulic supports exhibits excellent stability, lubricity, and corrosion resistance.

[0126] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0127] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for recycling and reusing antifreeze waste fluid from hydraulic supports, characterized in that, Includes the following steps: S1, the antifreeze waste liquid of the hydraulic support is filtered step by step using polypropylene needle-punched felt filter bag, oil-absorbing cotton and activated carbon fiber pleated filter element to obtain filtrate; S2, Add additives to the filtrate, stir and mix to obtain a new hydraulic support antifreeze product; In step S2, the additive is made from the following components in parts by weight: 12-22 parts antifreeze; 0.3-0.9 parts lubricant; 2-4 parts pH adjuster; 0.5-1 part composite corrosion inhibitor; 0.5-1.5 parts stabilizer; and 0.03-0.09 parts defoamer. The lubricant is a mixture of sodium C16-C18 fatty acid methyl ester sulfonate and sodium oleoyl N-methyl taurate. The pH adjuster is a mixture of sodium tetraborate and sodium citrate. The composite corrosion inhibitor is made from the following components in parts by weight: 0.2-0.6 parts sodium mercaptobenzothiazole, 2-7 parts sodium benzoate, 1-6 parts sodium polyaspartate, and 3-8 parts hydrolyzed polymaleic anhydride. The stabilizer is a mixture of mannitol and Pluronic PE 8100.

2. The method for recycling and reusing antifreeze waste liquid from hydraulic supports according to claim 1, characterized in that, The pore size of the polypropylene needle-punched felt filter bag is 25 μm; the pore size of the activated carbon fiber pleated filter element is 5 μm.

3. The method for recycling and reusing antifreeze waste liquid from hydraulic supports according to claim 1, characterized in that, The mass ratio of the filtrate to the additive is (70-90):(10-30).

4. The method for recycling and reusing antifreeze waste liquid from hydraulic supports according to claim 1, characterized in that, The antifreeze includes at least one of ethylene glycol, 1,2-propanediol, 1,3-propanediol, and diethylene glycol.

5. The method for recycling and reusing antifreeze waste liquid from hydraulic supports according to claim 1, characterized in that, The mass ratio of sodium C16-C18 fatty acid methyl ester sulfonate to sodium oleoyl N-methyl taurate is (1-3):

1.

6. The method for recycling and reusing antifreeze waste liquid from hydraulic supports according to claim 1, characterized in that, The mass ratio of sodium tetraborate to sodium citrate is 1:(1-2).

7. The method for recycling and reusing antifreeze waste liquid from hydraulic supports according to claim 1, characterized in that, The mass ratio of mannitol to Pluronic PE 8100 is (1-3):(1-2).

8. The method for recycling and reusing antifreeze waste liquid from hydraulic supports according to claim 1, characterized in that, The defoamer is a fluorosilicone polyether defoamer.

9. The method for recycling and reusing antifreeze waste fluid from hydraulic supports according to claim 1, characterized in that, The mixing time is 20 min to 40 min.

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