Cleaning agent as well as preparation method and use method thereof

Abstract

The invention provides a cleaning agent as well as a preparation method and a use method thereof. The cleaning agent comprises the following components in parts by weight: first parts of long-chain fatty acid amide, second parts of an organic solvent, third parts of alkylphenol polyoxyethylene ether, fourth parts of a penetrant and fifth parts of pure water. When the cleaning agent as well as the preparation method and the use method thereof are used for cleaning a filter material in a filter of a turbid circulating water system in the steel industry, the water permeability of the filter material can be improved. Good permeation, stripping, dispersion and the like effects on rolling oil and lubricating grease generated in the steel production process are achieved; the hardened filter material can be loosened, permeated, dissolved, stripped and the like after being soaked for a certain period of time, and most grease and mechanical impurities deposited on the filter material can be removed, so that the cleaning effect on the filter material can be improved, and the service life of the filter material can be prolonged; therefore, filtering efficiency of the filter can be enhanced, turbid water quality is improved, and quality of finished steel products is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment chemical cleaning, and in particular to a cleaning agent and a preparation method and a use method thereof. Background Art

[0002] In the steel production process, the ingots, plates or wires will directly contact with the cooling water spray. The scale and metal dust on the ingots, plates or wires, as well as the rolling oil, lubricating oil, hydraulic oil and other substances leaked in a small amount during the production process, will enter the circulating water system through the cooling water spray, washing and grease leakage during equipment maintenance. Therefore, the oil-containing circulating water system in the steel industry is mainly concentrated in the continuous casting turbid water, steel rolling turbid water and continuous casting and rolling turbid water systems.

[0003] Since lubricating oil, hydraulic oil and other oil substances have high viscosity, they are easy to bond with iron oxide and metal dust to form large particles. Although most of the particles and grease can be removed during the flocculation and sedimentation process, and separated from the circulating water system by grabbing mud or discharging mud from the bottom, a small amount of oil substances and suspended impurities will still enter the filter system. When the filter system is running, these oil substances and suspended impurities will be intercepted and can usually be discharged from the system through backwashing operations.

[0004] In the turbid circulating water system of the steel industry, valveless filters, sand filters, high-speed filters, activated carbon filters, walnut shell filters, fiber bundle filters and fiber ball filters are usually used as side filtration systems or full filtration systems. However, due to the insufficient penetration and dispersion ability of the filter materials of these filters for rolling oil and lubricating grease, the backwashing effect will deteriorate after the oil and sludge adhere, and the filtration efficiency will also decrease. In addition, with the long-term operation of the filter material, it is easy to cause the filter material to become calcified and fail, resulting in an increase in the oil content and suspended matter in the circulating water, which will cause the filter screen to be blocked and the nozzle to deposit sludge, resulting in insufficient nozzle spray cooling intensity, and ultimately affecting product quality. Summary of the invention

[0005] The object of the present invention is to provide a cleaning agent and a preparation method and a use method thereof, so as to solve one or more problems existing in the prior art, such as reduced filtration efficiency due to insufficient penetration and dispersion ability of the filter material of the filter for rolling oil and lubricating grease, and easy hardening and failure of the filter material due to long-term operation.

[0006] To achieve the above objectives, the present invention is implemented through the following technical scheme: a cleaning agent, including a first part by weight of a long-chain fatty acid amide, a second part by weight of an organic solvent, a third part by weight of an alkylphenol polyoxyethylene ether, a fourth part by weight of a penetrant, and a fifth part by weight of pure water.

[0007] Optionally, the value of the first weight parts is not less than 20 and not more than 40, the value of the second weight parts is not less than 20 and not more than 60, the value of the third weight parts is not less than 5 and not more than 15, the value of the fourth weight parts is not less than 5 and not more than 10, and the value of the fifth weight parts is not less than 10 and not more than 50.

[0008] Optionally, the structural formula of the long-chain fatty acid amide is:

[0009]

[0010] The values ​​of m and n are any integers between 2 and 6.

[0011] Optionally, the organic solvent includes methanol, ethanol, ethylene glycol or n-hexane.

[0012] Optionally, the penetrant includes fast penetrant T or penetrant JFC or penetrant HFC-M.

[0013] To achieve the above object, the present invention further provides a method for preparing a cleaning agent, wherein the cleaning agent is any of the cleaning agents described above, and the preparation method comprises:

[0014] Adding a first weight portion of long-chain fatty acid amide to a second weight portion of organic solvent, and stirring at a first speed for a first time to obtain a first mixed solution;

[0015] Adding a third part by weight of alkylphenol polyoxyethylene ether to the first mixed solution, and stirring at a second speed for a second time to obtain a second mixed solution;

[0016] adding a fourth weight portion of the penetrant to the second mixed solution, and stirring at a third speed for a third time to obtain a third mixed solution;

[0017] The cleaning agent is obtained by adding a fifth part by weight of pure water into the third mixed liquid and stirring the mixture at a fourth speed for a fourth time.

[0018] Optionally, the first speed, the second speed, the third speed and the fourth speed are all not less than 75 rpm and not more than 130 rpm.

[0019] Optionally, the first duration, the second duration and the third duration are not less than 10 minutes and not more than 15 minutes, and the fourth duration is not less than 60 minutes and not more than 120 minutes.

[0020] To achieve the above object, the present invention also provides a method for using a cleaning agent, wherein the cleaning agent is any of the cleaning agents described above, and the cleaning agent is used to clean filter material in a filter of a turbid circulating water system in the steel industry, and the method for using the cleaning agent comprises:

[0021] S100: Determine whether the filter is in normal working state:

[0022] If yes, perform the following steps:

[0023] S110: when starting the backwashing device to backwash the filter, adding the cleaning agent into the backwashing device;

[0024] S120: When the turbidity of the backwashing water of the backwashing device is lower than a preset turbidity, closing the backwashing device;

[0025] If not, stop running the filter and perform the following steps on the filter:

[0026] S130: draining the water in the filter and closing the water inlet valve and the water outlet valve provided on the filter;

[0027] S131: preparing the cleaning agent into a cleaning solution and adding the solution into the filter to soak the filter material;

[0028] S132: When the immersion time of the filter material in the cleaning liquid reaches a preset immersion time, starting the backwashing device to backwash the filter;

[0029] S133: When the turbidity of the backwashing water of the backwashing device is lower than a preset turbidity, closing the backwashing device;

[0030] S134: Determine whether the cleaning condition of the filter material meets the cleaning requirement of the filter material: if so, restart the filter; if not, return to execute steps S130 to S134.

[0031] Optionally, the method of use further includes: when the filter material is immersed in the cleaning liquid, stirring the filter material with water and gas.

[0032] Compared with the prior art, the cleaning agent and its preparation method and use method provided by the present invention have the following advantages:

[0033] Beneficial effects:

[0034] The cleaning agent provided by the present invention comprises a first weight portion of long-chain fatty acid amide, a second weight portion of organic solvent, a third weight portion of alkylphenol polyoxyethylene ether, a fourth weight portion of penetrant, and a fifth weight portion of pure water. Thus, the cleaning agent provided by the present invention uses long-chain fatty acid amide, organic solvent, alkylphenol polyoxyethylene ether, penetrant, and pure water as main raw materials, and uses the cleaning agent provided by the present invention to clean the filter material in the filter of the turbid water system of the steel industry, thereby improving the water permeability of the filter material. It has good penetration, stripping, and dispersion effects on the rolling oil and lubricating grease produced in the steel production process; for the filter material that has formed a compaction, it can loosen, penetrate, dissolve, and strip through a certain period of soaking, and can remove most of the grease and mechanical impurities deposited on the filter material, thereby improving the cleaning effect of the filter material and extending the service life of the filter material, thereby enhancing the filtration efficiency of the filter, improving the turbid water quality, and improving the quality of the finished steel product.

[0035] The preparation method of the cleaning agent provided by the present invention, the cleaning agent is the cleaning agent described in any of the above items, and the preparation method comprises: first adding the first weight portion of long-chain fatty acid amide to the second weight portion of organic solvent, and stirring at a first speed for a first time to obtain a first mixed solution; then adding the third weight portion of alkylphenol polyoxyethylene ether to the first mixed solution, and stirring at a second speed for a second time to obtain a second mixed solution; then adding the fourth weight portion of penetrant to the second mixed solution, and stirring at a third speed for a third time to obtain a third mixed solution; finally, adding the fifth weight portion of pure water to the third mixed solution, and stirring at a fourth speed for a fourth time to obtain the cleaning agent. Therefore, the preparation method of the cleaning agent provided by the present invention adopts a step-by-step addition method of raw materials, and the preparation method is simple and the preparation cost is low. In addition, since the preparation method of the cleaning agent provided by the present invention belongs to the same inventive concept as the cleaning agent described in any of the above items, the preparation method of the cleaning agent provided by the present invention at least has all the advantages of the cleaning agent provided by the present invention. For the advantages of the preparation method of the cleaning agent provided by the present invention, please refer to the relevant description of the beneficial effects of the cleaning agent provided by the present invention, which will not be repeated here.

[0036] The method for using a cleaning agent provided by the present invention, wherein the cleaning agent is any of the cleaning agents described above, and the cleaning agent is used to clean filter materials in a filter of a turbid circulating water system in the steel industry, and the method for using the cleaning agent comprises: S100: determining whether the filter is in a normal working state; if so, executing the following steps: S110: when starting a backwashing device to backwash the filter, adding the cleaning agent to the backwashing device; S120: when the turbidity of the backwashing water of the backwashing device is lower than a preset turbidity, shutting down the backwashing device; if not, stopping the operation of the filter, and executing the following steps on the filter: S130: draining the filter; water in the filter, close the water inlet valve and the water outlet valve provided on the filter; S131: prepare the cleaning agent into a cleaning liquid and add it to the filter to soak the filter material; S132: when the soaking time of the filter material in the cleaning liquid reaches the preset soaking time, start the backwashing device to backwash the filter; S133: when the turbidity of the backwashing water of the backwashing device is lower than the preset turbidity, close the backwashing device; S134: judge whether the cleaning condition of the filter material meets the cleaning requirements of the filter material: if so, restart the filter; if not, return to execute step S130-step S134. Therefore, the use method of the cleaning agent provided by the present invention has a better cleaning effect on the filter material by using the cleaning agent to clean the filter material in the filter of the turbid circulating water system of the steel industry. When the filter is in a normal working state, when the backwashing device is started to backwash the filter, the cleaning effect on the filter material can be enhanced by adding the cleaning agent to the backwashing device. Furthermore, when the filter material of the filter is in an abnormal working state due to severe compaction, the severely compacted filter material is soaked in a cleaning solution prepared with the cleaning agent provided by the present invention, and then the backwashing device is started to backwash the filter, and the cleaning operation is repeated on the filter according to the degree of compaction of the filter material until the cleaning requirements of the filter material are met (exemplarily, the cleaning requirements of the filter material include but are not limited to making the upper layer of the filter material basically free of sludge and making the filter material loose and non-paste-like), thereby enhancing the cleaning effect of the filter material. In addition, since the method for using the cleaning agent provided by the present invention belongs to the same inventive concept as the cleaning agent described in any of the above items, the method for using the cleaning agent provided by the present invention at least has all the advantages of the cleaning agent provided by the present invention. For the advantages of the method for using the cleaning agent provided by the present invention, please refer to the relevant description of the beneficial effects of the cleaning agent provided by the present invention, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A flow chart of a method for preparing a cleaning agent provided in Example 2 of the present invention;

[0038] Figure 2 This is a flow chart of a method for using a cleaning agent provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0039] The cleaning agent and its preparation method and use method proposed by the present invention are further described in detail below in combination with the drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Any modification of the structure, change of the proportional relationship or adjustment of the size, in the case of the same or similar effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. The specific design features of the present invention disclosed herein include, for example, specific dimensions, directions, positions and shapes, which will be determined in part by the specific environment to be applied and used. And, in the embodiments described below, sometimes the same figure mark is used to represent the same part or part with the same function between different drawings, and its repeated description is omitted.

[0040] It should be understood that, unless otherwise stated or obvious from the context, as used herein, the term "about" is understood to be within the normal tolerance range in the art, such as within 2 standard deviations of the mean. "About" can be understood to be within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05% or 0.01% of the value. Unless otherwise clear from the context, all numerical values ​​provided herein are modified by the term "about".

[0041] Embodiment 1

[0042] The present embodiment provides a cleaning agent. The cleaning agent includes a first weight portion of long-chain fatty acid amide, a second weight portion of organic solvent, a third weight portion of alkylphenol polyoxyethylene ether, a fourth weight portion of penetrant, and a fifth weight portion of pure water. Therefore, the cleaning agent provided in the present embodiment, by using long-chain fatty acid amide, organic solvent, alkylphenol polyoxyethylene ether, penetrant, and pure water as the main raw materials, can improve the water permeability of the filter material when used to clean the filter material in the filter of the turbid water system of the steel industry. It has good penetration, stripping, and dispersion effects on the rolling oil and lubricating grease produced in the steel production process; for the filter material that has formed a compaction, it can loosen, penetrate, dissolve, and strip through a certain period of soaking, and can remove most of the grease and mechanical impurities deposited on the filter material, thereby improving the cleaning effect of the filter material and extending the service life of the filter material, thereby enhancing the filtration efficiency of the filter, improving the turbid water quality, and improving the quality of the finished steel product.

[0043] It should be noted that the long-chain fatty acid amide has the ability of wetting, emulsification, dispersion, penetration, etc.; the alkylphenol polyoxyethylene ether is an important polyoxyethylene nonionic surfactant, which has the functions of emulsification, dispersion, solubilization and washing, and has the characteristics of stable properties, acid and alkali resistance and low cost. The synergistic effect between the long-chain fatty acid amide, organic solvent, alkylphenol polyoxyethylene ether, penetrant and pure water lays a good foundation for enhancing the cleaning effect of the cleaning agent.

[0044] Preferably, the value of the first weight part is not less than 20 and not more than 40, the value of the second weight part is not less than 20 and not more than 60, the value of the third weight part is not less than 5 and not more than 15, the value of the fourth weight part is not less than 5 and not more than 10, and the value of the fifth weight part is not less than 10 and not more than 50. Thus, the cleaning effect of the cleaning agent on the filter material can be enhanced.

[0045] Preferably, the structural formula of the long-chain fatty acid amide is:

[0046]

[0047] The values ​​of m and n are any integers between 2 and 6.

[0048] It should be noted that the chemical properties of long-chain fatty acid amides are determined by the hydrophilic and hydrophobic groups in the molecules, and their hydrophobicity is affected by the length of the carbon chain in the molecule. Generally, the longer the carbon chain, the stronger the hydrophobicity; and the end containing nitrogen and carboxyl groups is hydrophilic. Therefore, using the long-chain fatty acid amide of the above structural formula as a component of the cleaning agent lays a good foundation for obtaining a cleaning agent with better cleaning effect.

[0049] Furthermore, the organic solvent includes methanol or ethanol or ethylene glycol or n-hexane. It should be noted that these organic solvents are miscible with long-chain fatty acid amides; they can also reduce the HLB value (Hydrophilic Lipophilic Balance) of alkylphenol polyoxyethylene ether, making it more lipophilic, thereby enhancing its ability to dissolve grease. In addition, these organic solvents can also effectively dissolve the grease attached to the filter material, making it easier to separate the filter material from the sludge, thereby improving the cleaning effect of the cleaning agent.

[0050] Preferably, the penetrant includes fast penetrant T or penetrant JFC or penetrant HFC-M. Therefore, since these penetrants are easily soluble in water, penetrate quickly, penetrate evenly, and have good wettability, the cleaning agent can more easily wet and penetrate into the surface of the object to be cleaned, thereby enhancing the cleaning effect of the cleaning agent.

[0051] In order to facilitate understanding of the present invention, filter material cleaning experiments are carried out using the first to fifth cleaning agents provided by the present invention to obtain Experimental Examples 1-5, and filter material without adding cleaning agent is used as a comparative example.

[0052] Among them, the first cleaning agent includes the following components in parts by weight: 20 parts of long-chain fatty acid amide, 55 parts of methanol, 5 parts of alkylphenol polyoxyethylene ether, 5 parts of penetrant, and 15 parts of pure water; the second cleaning agent includes the following components in parts by weight: 25 parts of long-chain fatty acid amide, 50 parts of methanol, 10 parts of alkylphenol polyoxyethylene ether, 5 parts of penetrant, and 10 parts of pure water; the third cleaning agent includes the following components in parts by weight: 30 parts of long-chain fatty acid amide, 30 parts of methanol, 5 parts of alkylphenol polyoxyethylene ether, 5 parts of penetrant, and 30 parts of pure water; the fourth cleaning agent includes the following components in parts by weight: 35 parts of long-chain fatty acid amide, 35 parts of methanol, 5 parts of alkylphenol polyoxyethylene ether, 5 parts of penetrant, and 10 parts of pure water; the fifth cleaning agent includes the following components in parts by weight: 40 parts of long-chain fatty acid amide, 45 parts of methanol, 5 parts of alkylphenol polyoxyethylene ether, 5 parts of penetrant, and 10 parts of pure water.

[0053] The experimental method is to dig out the oil-containing quartz sand filter material from the filter with severe compaction for use, weigh 6 portions of about 100.00g of the filter material and put it into a 105°C oven for drying for 4 hours and weigh it. Then put them in 100mL beakers respectively, add the first to fifth cleaning agents to 5 of the beakers respectively, and do not add any cleaning agent to the remaining 1 beaker. Stir the filter material in the beaker evenly and soak it for 24 hours, then wash it with clean water and filter it dry, and then put the filter material into a 105°C oven for drying for 4 hours and weigh it. Then, burn the filter material at 550°C and weigh it after the filter material cools down. In this way, the weight of the oil content in the filter material after cleaning and the oil removal rate of the cleaning agent in each experimental example can be obtained. Please refer to Table 1 for the experimental results.

[0054] Table 1

[0055]

[0056] It should be noted that the weight of oil in the filter material after cleaning and the oil removal rate of the cleaning agent are calculated by the following formulas (1) and (2) respectively:

[0057] The weight of oil in the filter material after washing = the weight after washing, filtering and drying at 105℃ for 4 hours - the weight after burning at 550℃ and cooling (1)

[0058] Oil removal rate of the cleaning agent in the experimental example = (weight of oil in the filter material after cleaning in the comparative example - weight of oil in the filter material after cleaning in the experimental example) ÷ weight of oil in the filter material after cleaning in the comparative example × 100% (2)

[0059] For example, in Experimental Example 1, the weight of oil in the filter material after cleaning = 94.02-90.45 = 3.57, and the oil removal rate of the cleaning agent = (4.74-3.57) ÷ 4.74 × 100% = 24.68%.

[0060] From the above experimental results, it can be seen that adding the cleaning agent provided by the present invention to clean the oil-containing filter material has a very good cleaning effect, and the oil removal rate is approximately between 24% and 68%.

[0061] Embodiment 2

[0062] This embodiment provides a method for preparing a cleaning agent, wherein the cleaning agent is the cleaning agent described in any of the above embodiments. Figure 1 , Figure 1 The following is a flow chart of the preparation method of the cleaning agent provided in this embodiment. Figure 1 It can be seen that the preparation method comprises:

[0063] SA1: adding a first weight portion of a long-chain fatty acid amide to a second weight portion of an organic solvent, and stirring at a first speed for a first time to obtain a first mixed solution;

[0064] SA2: adding a third part by weight of alkylphenol polyoxyethylene ether to the first mixed solution, and stirring at a second speed for a second time to obtain a second mixed solution;

[0065] SA3: adding a fourth weight portion of the penetrant to the second mixed solution, and stirring at a third speed for a third time to obtain a third mixed solution;

[0066] SA4: adding a fifth weight portion of pure water to the third mixed liquid, and stirring at a fourth speed for a fourth time to obtain the cleaning agent.

[0067] Therefore, the preparation method of the cleaning agent provided in this embodiment adopts a stepwise addition method of raw materials, and the preparation method is simple and has low preparation cost. In addition, since the preparation method of the cleaning agent provided in this embodiment and the cleaning agent described in any of the above embodiments belong to the same inventive concept, the preparation method of the cleaning agent provided in this embodiment at least has all the advantages of the cleaning agents provided in the above embodiments. For the advantages of the preparation method of the cleaning agent provided in this embodiment, please refer to the relevant description of the beneficial effects of the cleaning agents provided in the above embodiments, which will not be repeated here.

[0068] Preferably, the first speed, the second speed, the third speed and the fourth speed are not less than 75 rpm and not more than 130 rpm. Thus, it is possible to ensure that the components in the cleaning agent are evenly mixed, and easy to control and repeat, thereby ensuring the quality and performance of the cleaning agent, so that it can achieve the best effect in practical applications.

[0069] Furthermore, the first duration, the second duration and the third duration are not less than 10 minutes and not more than 15 minutes, and the fourth duration is not less than 60 minutes and not more than 120 minutes. Thus, by making the first duration, the second duration and the third duration not less than 10 minutes and not more than 15 minutes, it is easier to control the mixing degree of stirring, ensuring that the components in the cleaning agent are evenly mixed, thereby improving the quality and performance of the cleaning agent; by making the fourth duration not less than 60 minutes and not more than 120 minutes, it is possible to ensure that all components in the cleaning agent are fully mixed, thereby further improving the quality and performance of the cleaning agent.

[0070] Embodiment 3

[0071] This embodiment provides a method for using a cleaning agent, wherein the cleaning agent is the cleaning agent described in any of the above embodiments, and the cleaning agent is used to clean the filter material in the filter of the turbid circulating water system of the steel industry. Figure 2 , Figure 2 The following is a flow chart of the method for using the cleaning agent provided in this embodiment. Figure 2It can be seen that the method of use includes:

[0072] S100: Determine whether the filter is in normal working state:

[0073] If yes, perform the following steps:

[0074] S110: when starting the backwashing device to backwash the filter, adding the cleaning agent into the backwashing device;

[0075] S120: When the turbidity of the backwashing water of the backwashing device is lower than a preset turbidity, closing the backwashing device;

[0076] If not, stop running the filter and perform the following steps on the filter:

[0077] S130: draining the water in the filter and closing the water inlet valve and the water outlet valve provided on the filter;

[0078] S131: preparing the cleaning agent into a cleaning solution and adding the solution into the filter to soak the filter material;

[0079] S132: When the immersion time of the filter material in the cleaning liquid reaches a preset immersion time, starting the backwashing device to backwash the filter;

[0080] S133: When the turbidity of the backwashing water of the backwashing device is lower than a preset turbidity, closing the backwashing device;

[0081] S134: Determine whether the cleaning condition of the filter material meets the cleaning requirement of the filter material: if so, restart the filter; if not, return to execute steps S130 to S134.

[0082] Therefore, the method for using the cleaning agent provided in this embodiment has a better cleaning effect on the filter material by using the cleaning agent to clean the filter material in the filter of the turbid water system of the steel industry. When the filter is in a normal working state, when the backwashing device is started to backwash the filter, the cleaning effect on the filter material can be enhanced by adding the cleaning agent to the backwashing device. Further, when the filter material of the filter is in an abnormal working state due to severe compaction, the filter material with severe compaction is soaked in a cleaning liquid prepared by using the cleaning agent provided in any of the above embodiments, and then the backwashing device is started to backwash the filter, and the cleaning operation is repeated on the filter according to the degree of compaction of the filter material until the cleaning requirements of the filter material are met (exemplarily, the cleaning requirements of the filter material include but are not limited to making the upper layer of the filter material basically free of sludge and making the filter material loose and non-paste), thereby enhancing the cleaning effect on the filter material. In addition, since the method for using the cleaning agent provided in this embodiment belongs to the same inventive concept as the cleaning agent described in any of the above-mentioned embodiments, the method for using the cleaning agent provided in this embodiment has at least all the advantages of the cleaning agents provided in the above-mentioned embodiments. For the advantages of the method for using the cleaning agent provided in this embodiment, please refer to the relevant description of the beneficial effects of the cleaning agents provided in the above-mentioned embodiments, which will not be repeated here.

[0083] It should be noted that when the filter material of the filter is in an abnormal working state due to severe compaction, the cleaning agent provided by the present invention is used to prepare a cleaning liquid, and the amount of the cleaning agent used is about 0.1% of the capacity of the filter. In addition, the present invention does not impose too many restrictions on the value range of the preset turbidity and the preset soaking time. For example, in one exemplary embodiment, the preset turbidity is 20NTU, and the preset soaking time is not less than 12 hours and not more than 24 hours.

[0084] Preferably, the method of use further comprises: when the filter material is soaked in the cleaning liquid, stirring the filter material with water and air, thereby facilitating uniform soaking of the filter material, thereby improving the cleaning effect of the cleaning agent.

[0085] It should be noted that the present invention does not impose too many limitations on the use of the cleaning agent. For example, in some other embodiments, the cleaning agent can also be used to clean filter materials in oilfield wastewater filtration systems.

[0086] In order to facilitate the understanding of the present invention, the cleaning operation process when the filter is in a normal working state is described as an example.

[0087] When the filter is in normal working condition, first, before starting the backwashing device to backwash the filter, use a metering pump to inject the cleaning agent into the backwash water supply main pipe. Then, during backwashing, the cleaning agent can enter the filter with the backwash water and contact with the compacted filter material. Through the dissolution, penetration, peeling, and dispersion of the cleaning agent, the grease adhering to the filter material can be separated. Finally, when the backwash effluent turns from black to clear and the turbidity of the backwash effluent is detected to be lower than 20NTU, it can be basically considered that the cleaning effect has been achieved.

[0088] In order to further understand the present invention, the cleaning operation process when the filter is in an abnormal working state is described as an example.

[0089] When the filter is in an abnormal working state due to serious compaction of the filter material, first stop the operation of the filter, drain the water in the filter, and close the water inlet valve and the water outlet valve provided on the filter. Then, use the cleaning agent provided by the present invention to prepare a cleaning solution, inject the cleaning solution into the filter, and make the filter material in the filter completely immersed in the cleaning solution, and stir the filter material with water vapor while soaking. After soaking for 12 hours to 24 hours, start the backwashing device to backwash the filter. When the backwashing effluent turns from black to clear and the turbidity of the backwashing effluent is detected to be lower than 20NTU, the backwashing operation is terminated. Then, the staff opens the manhole at the top of the filter to check the sludge thickness of the filter material layer and the looseness of the filter material. If it is observed that there is basically no sludge attached to the upper layer of the filter material, and the filter material is loose and not pasty, it can be considered that the cleaning effect is achieved; if the filter material is still severely compacted, the water in the filter is drained again, and the above cleaning operation is repeated until the sludge is completely cleaned, and then the backwashing device is closed and the filter is restarted to resume normal operation.

[0090] In summary, the cleaning agent provided by the present invention and its preparation method and use method have the following advantages: the cleaning agent provided by the present invention comprises a first weight portion of long-chain fatty acid amide, a second weight portion of organic solvent, a third weight portion of alkylphenol polyoxyethylene ether, a fourth weight portion of penetrant, and a fifth weight portion of pure water. Thus, the cleaning agent provided by the present invention uses long-chain fatty acid amide, organic solvent, alkylphenol polyoxyethylene ether, penetrant, and pure water as main raw materials, and uses the cleaning agent provided by the present invention to clean the filter material in the filter of the turbid water system of the steel industry, which can improve the water permeability of the filter material. It has good penetration, stripping, and dispersion effects on the rolling oil and lubricating grease generated in the steel production process; for the filter material that has formed a compaction, it can loosen, penetrate, dissolve, and strip through a certain period of soaking, and can remove most of the grease and mechanical impurities deposited on the filter material, thereby improving the cleaning effect of the filter material and extending the service life of the filter material, thereby enhancing the filtration efficiency of the filter, improving the turbid water quality, and improving the quality of the finished steel product.

[0091] The preparation method of the cleaning agent provided by the present invention, the cleaning agent is the cleaning agent described in any of the above items, and the preparation method comprises: first adding the first weight portion of long-chain fatty acid amide to the second weight portion of organic solvent, and stirring at a first speed for a first time to obtain a first mixed solution; then adding the third weight portion of alkylphenol polyoxyethylene ether to the first mixed solution, and stirring at a second speed for a second time to obtain a second mixed solution; then adding the fourth weight portion of penetrant to the second mixed solution, and stirring at a third speed for a third time to obtain a third mixed solution; finally, adding the fifth weight portion of pure water to the third mixed solution, and stirring at a fourth speed for a fourth time to obtain the cleaning agent. Therefore, the preparation method of the cleaning agent provided by the present invention adopts a step-by-step addition method of raw materials, and the preparation method is simple and the preparation cost is low. In addition, since the preparation method of the cleaning agent provided by the present invention belongs to the same inventive concept as the cleaning agent described in any of the above items, the preparation method of the cleaning agent provided by the present invention at least has all the advantages of the cleaning agent provided by the present invention. For the advantages of the preparation method of the cleaning agent provided by the present invention, please refer to the relevant description of the beneficial effects of the cleaning agent provided by the present invention, which will not be repeated here.

[0092] The method for using a cleaning agent provided by the present invention, wherein the cleaning agent is any of the cleaning agents described above, and the cleaning agent is used to clean filter materials in a filter of a turbid circulating water system in the steel industry, and the method for using the cleaning agent comprises: S100: determining whether the filter is in a normal working state; if so, executing the following steps: S110: when starting a backwashing device to backwash the filter, adding the cleaning agent to the backwashing device; S120: when the turbidity of the backwashing water of the backwashing device is lower than a preset turbidity, shutting down the backwashing device; if not, stopping the operation of the filter, and executing the following steps on the filter: S130: draining the filter; water in the filter, close the water inlet valve and the water outlet valve provided on the filter; S131: prepare the cleaning agent into a cleaning liquid and add it to the filter to soak the filter material; S132: when the soaking time of the filter material in the cleaning liquid reaches the preset soaking time, start the backwashing device to backwash the filter; S133: when the turbidity of the backwashing water of the backwashing device is lower than the preset turbidity, close the backwashing device; S134: judge whether the cleaning condition of the filter material meets the cleaning requirements of the filter material: if so, restart the filter; if not, return to execute step S130-step S134. Therefore, the use method of the cleaning agent provided by the present invention has a better cleaning effect on the filter material by using the cleaning agent to clean the filter material in the filter of the turbid circulating water system of the steel industry. When the filter is in a normal working state, when the backwashing device is started to backwash the filter, the cleaning effect on the filter material can be enhanced by adding the cleaning agent to the backwashing device. Furthermore, when the filter material of the filter is in an abnormal working state due to severe compaction, the severely compacted filter material is soaked in a cleaning solution prepared with the cleaning agent provided by the present invention, and then the backwashing device is started to backwash the filter, and the cleaning operation is repeated on the filter according to the degree of compaction of the filter material until the cleaning requirements of the filter material are met (exemplarily, the cleaning requirements of the filter material include but are not limited to making the upper layer of the filter material basically free of sludge and making the filter material loose and non-paste-like), thereby enhancing the cleaning effect of the filter material. In addition, since the method for using the cleaning agent provided by the present invention belongs to the same inventive concept as the cleaning agent described in any of the above items, the method for using the cleaning agent provided by the present invention at least has all the advantages of the cleaning agent provided by the present invention. For the advantages of the method for using the cleaning agent provided by the present invention, please refer to the relevant description of the beneficial effects of the cleaning agent provided by the present invention, which will not be repeated here.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A cleaning agent, characterized in that: The invention comprises a first part by weight of a long-chain fatty acid amide, a second part by weight of an organic solvent, a third part by weight of an alkylphenol polyoxyethylene ether, a fourth part by weight of a penetrant, and a fifth part by weight of pure water.

2. The cleaning agent according to claim 1, characterized in that The value of the first weight part is not less than 20 and not more than 40, the value of the second weight part is not less than 20 and not more than 60, the value of the third weight part is not less than 5 and not more than 15, the value of the fourth weight part is not less than 5 and not more than 10, and the value of the fifth weight part is not less than 10 and not more than 50.

3. The cleaning agent according to claim 1, characterized in that The structural formula of the long-chain fatty acid amide is: The values ​​of m and n are any integers between 2 and 6.

4. The cleaning agent according to claim 1, characterized in that The organic solvent includes methanol, ethanol, ethylene glycol or n-hexane.

5. The cleaning agent according to claim 1, characterized in that The penetrant includes fast penetrant T, penetrant JFC or penetrant HFC-M.

6. A method for preparing a cleaning agent, characterized in that: The cleaning agent is the cleaning agent according to any one of claims 1 to 5, and the preparation method comprises: Adding a first weight portion of long-chain fatty acid amide to a second weight portion of organic solvent, and stirring at a first speed for a first time to obtain a first mixed solution; Adding a third part by weight of alkylphenol polyoxyethylene ether to the first mixed solution, and stirring at a second speed for a second time to obtain a second mixed solution; adding a fourth weight portion of the penetrant to the second mixed solution, and stirring at a third speed for a third time to obtain a third mixed solution; The cleaning agent is obtained by adding a fifth part by weight of pure water into the third mixed liquid and stirring the mixture at a fourth speed for a fourth time.

7. The method for preparing the cleaning agent according to claim 6, characterized in that: The first rotational speed, the second rotational speed, the third rotational speed and the fourth rotational speed are all not lower than 75 rpm and not higher than 130 rpm.

8. The method for preparing the cleaning agent according to claim 6, characterized in that: The first duration, the second duration and the third duration are not less than 10 minutes and not more than 15 minutes, and the fourth duration is not less than 60 minutes and not more than 120 minutes.

9. A method for using a cleaning agent, characterized in that: The cleaning agent is the cleaning agent according to any one of claims 1 to 5, and the cleaning agent is used to clean the filter material in the filter of the turbid circulating water system of the steel industry, and the method of use includes: S100: Determine whether the filter is in normal working state: If yes, perform the following steps: S110: when starting the backwashing device to backwash the filter, adding the cleaning agent into the backwashing device; S120: When the turbidity of the backwashing water of the backwashing device is lower than a preset turbidity, closing the backwashing device; If not, stop running the filter and perform the following steps on the filter: S130: draining the water in the filter and closing the water inlet valve and the water outlet valve provided on the filter; S131: preparing the cleaning agent into a cleaning solution and adding the solution into the filter to soak the filter material; S132: When the immersion time of the filter material in the cleaning liquid reaches a preset immersion time, starting the backwashing device to backwash the filter; S133: When the turbidity of the backwashing water of the backwashing device is lower than a preset turbidity, closing the backwashing device; S134: Determine whether the cleaning condition of the filter material meets the cleaning requirement of the filter material: if so, restart the filter; if not, return to execute steps S130 to S134.

10. The method for using the cleaning agent according to claim 9, characterized in that: The method of use further includes: when the filter material is immersed in the cleaning liquid, stirring the filter material with water and gas.

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