A special cleaning agent for pyrite concentrate ceramic filter plate and its preparation method and application

Abstract

The application provides a special cleaning agent for sulphur concentrate ceramic filter plates and a preparation method and application thereof, and the special cleaning agent for sulphur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 80-90 parts of a cleaning main agent, 3-6 parts of a chelating agent, 0.05-0.5 parts of a surfactant, 1.5-8 parts of an inhibitor, and 2-5 parts of an alginate stabilizer; the inhibitor is an alcohol amine inhibitor and a benzimidazole inhibitor with a mass ratio of 3:1-5:1. The cleaning agent prepared in the application is obviously improved in terms of a cleaning cycle, a filtering efficiency after cleaning and a service life, and the cleaning effect of the cleaning agent is better.

Description

Technical Field

[0001] This invention belongs to the field of cleaning technology, specifically relating to a special cleaning agent for sulfur concentrate ceramic filter plates, its preparation method, and its application. Background Technology

[0002] Sulfur concentrate is a type of ore containing a high concentration of sulfur and is one of the main raw materials for sulfur extraction and the manufacture of sulfuric acid and fertilizers. In recent years, the increasing demand for sulfur concentrate from the fertilizer and sulfuric acid industries has greatly stimulated the production of sulfur concentrate.

[0003] Ceramic filters are used in the production of sulfur concentrate. A ceramic filter is a new type of equipment based on the principle of capillary action, using microporous ceramics as the filter medium to achieve solid-liquid separation. The ceramic filter mainly consists of ceramic filter plates, a roller system, a stirring system, a feeding and discharging system, a vacuum system, a filtrate discharge system, a scraping system, a backwashing system, a combined cleaning system (ultrasonic cleaning, automatic acid mixing cleaning), a fully automatic control system, a tank, and a frame. As the core component of the ceramic filter, the ceramic filter plate traps solid minerals from the suspension on its surface to form a filter cake during solid-liquid separation. Water is discharged through the micropores of the filter plate, resulting in dehydrated minerals. It features high yield, uniform and stable pore size, and high mechanical strength.

[0004] During solid-liquid separation, ceramic filter plates are subject to adsorption by hydroxyl compounds formed from FeSO4, CaSO4, Al2(SO4)3, MnSO4, SiO2, and iron-silicon ions present in the sulfur concentrate. If the ceramic filter plates are not effectively cleaned for a prolonged period, these hydroxyl compounds will transform into insoluble oxides, clogging the pores and gradually weakening the filter plates' ability to pass through water while preventing airflow. Current technologies typically use acidic cleaning agents such as nitric acid to clean ceramic filter plates, aiming to improve filtration efficiency. However, the strong acid in these cleaning agents causes severe corrosion, and the cleaned plates still suffer from low filtration efficiency, short cleaning cycles, and short lifespans.

[0005] In view of the problems existing in existing cleaning agents, the present invention aims to provide a special cleaning agent for sulfur concentrate ceramic filter plates that not only reduces corrosion of ceramic filter plates during cleaning, but also improves the filtration efficiency of ceramic filter plates after cleaning, and extends the service life and cleaning cycle of ceramic filter plates. Summary of the Invention

[0006] The purpose of this invention is to provide a special cleaning agent for sulfur concentrate ceramic filter plates, its preparation method and application, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: On one hand, the present invention provides a special cleaning agent for sulfur concentrate ceramic filter plates, the special cleaning agent for sulfur concentrate ceramic filter plates comprising the following raw materials in parts by weight: 80-90 parts of cleaning main agent, 3-6 parts of chelating agent, 0.05-0.5 parts of surfactant, 1.5-8 parts of corrosion inhibitor, and 2-5 parts of alginic acid stabilizer;

[0008] The corrosion inhibitor comprises an alcohol amine corrosion inhibitor and a benzimidazole corrosion inhibitor in a mass ratio of 3:1 to 5:1.

[0009] The cleaning agent is at least one of sodium tripolyphosphate, sodium silicate, sodium percarbonate, sodium chloride, sodium pyrophosphate, and trisodium phosphate.

[0010] The chelating agent is at least one of sodium citrate, sodium formate, sodium acetate, and tetrasodium ethylenediaminetetraacetate.

[0011] The surfactant is at least one of octyltrimethylammonium chloride, nonylphenol polyoxyethylene ether, sorbitan polyoxyethylene oleate, and sodium dodecyl polyoxyethylene ether sulfate.

[0012] The alkanolamine corrosion inhibitor is at least one of dimethylethanolamine, diethylene glycolamine, and isopropanolamine.

[0013] The benzimidazole corrosion inhibitor is at least one of 2-aminobenzimidazole, 2-methylbenzimidazole, and 2-mercaptobenzimidazole.

[0014] The alginate stabilizer is a mixture comprising alginate, propylene glycol alginate, and sodium alginate.

[0015] The mass ratio of alginate, propylene glycol alginate, and sodium alginate is 1:2-4:1.5-3.

[0016] On the other hand, the present invention also provides a method for preparing a special cleaning agent for sulfur concentrate ceramic filter plates, comprising the following steps:

[0017] (1) Add the chelating agent, alginate stabilizer and surfactant to the reaction vessel at a temperature of 35-60℃ and perform ultrasonic vibration;

[0018] (2) Add the cleaning agent, corrosion inhibitor and water to the reaction system of step (1), and after ultrasonic vibration, cool to room temperature to obtain the special cleaning agent for sulfur concentrate ceramic filter plate.

[0019] On the other hand, the present invention also provides an application of a special cleaning agent for sulfur concentrate ceramic filter plates in the cleaning field.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The cleaning agent prepared in this application has significantly improved the cleaning cycle, post-cleaning filtration efficiency, and service life. The cleaning effect of the cleaning agent is better, and since the cleaning agent provided in this application does not use strong acids such as nitric acid, it does not corrode equipment, sealing rings, plastic parts, etc. when cleaning ceramic filter plates, and is safer to use. Detailed Implementation

[0022] The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0023] It should be noted that, unless otherwise specified in the examples, the techniques or conditions described in the literature in this field or the product instructions shall be followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products. Octyltrimethylammonium chloride was purchased from Guangzhou Yuanda New Materials Co., Ltd.; nonylphenol polyoxyethylene ether was purchased from Jinan Taiwang Chemical Co., Ltd., model NP-10; alginate was purchased from Shandong Suihua Biotechnology Co., Ltd.; propylene glycol alginate was purchased from Jiangsu Pules Biotechnology Co., Ltd.; sodium alginate was purchased from Wuhan Huaxiang Kejie Biotechnology Co., Ltd.; sodium tripolyphosphate was purchased from Suzhou Baiying Chemical Co., Ltd.; 2-mercaptobenzimidazole was purchased from Shandong Jinyufeng New Materials Co., Ltd.; and 2-methylbenzimidazole was purchased from Jiangsu Pules Biotechnology Co., Ltd.

[0024] Example 1:

[0025] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6 parts dimethylethanolamine, 1.5 parts 2-mercaptobenzimidazole, 1 part alginic acid, 2.5 parts propylene glycol alginate, and 1.5 parts sodium alginate.

[0026] Example 2:

[0027] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 15 parts sodium tripolyphosphate, 40 parts sodium silicate, 20 parts sodium percarbonate, 8 parts sodium chloride, 5 parts sodium citrate, 0.4 parts nonylphenol polyoxyethylene ether, 3 parts dimethylethanolamine, 3 parts diethylene glycolamine, 0.5 parts 2-methylbenzimidazole, 1 part 2-mercaptobenzimidazole, 1 part alginate, 2 parts propylene glycol alginate, and 2 parts sodium alginate.

[0028] Example 3:

[0029] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 15 parts sodium tripolyphosphate, 20 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 20 parts trisodium phosphate, 5 parts tetrasodium ethylenediaminetetraacetate, 0.4 parts nonylphenol polyoxyethylene ether, 3 parts dimethylethanolamine, 3 parts diethylene glycolamine, 1 part 2-methylbenzimidazole, 1 part 2-mercaptobenzimidazole, 0.5 parts alginate, 2 parts propylene glycol alginate, and 1.5 parts sodium alginate.

[0030] Example 4:

[0031] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6 parts dimethylethanolamine, 1.5 parts 2-mercaptobenzimidazole, and 5 parts alginate.

[0032] Example 5:

[0033] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6 parts dimethylethanolamine, 1.5 parts 2-mercaptobenzimidazole, and 5 parts propylene glycol alginate.

[0034] Example 6:

[0035] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6 parts dimethylethanolamine, 1.5 parts 2-mercaptobenzimidazole, and 5 parts sodium alginate.

[0036] Example 7:

[0037] A cleaning agent for ceramic filter plates made of sulfur concentrate comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6 parts dimethylethanolamine, 1.5 parts 2-mercaptobenzimidazole, 1.43 parts alginate, and 3.57 parts propylene glycol alginate.

[0038] Example 8:

[0039] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6 parts dimethylethanolamine, 1.5 parts 2-mercaptobenzimidazole, 2 parts alginate, and 3 parts sodium alginate.

[0040] Example 9:

[0041] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6 parts dimethylethanolamine, 1.5 parts 2-mercaptobenzimidazole, 3 parts propylene glycol alginate, and 2 parts sodium alginate.

[0042] Example 10:

[0043] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6 parts dimethylethanolamine, 1.5 parts 2-mercaptobenzimidazole, 0.5 parts alginate, 2.5 parts propylene glycol alginate, and 2 parts sodium alginate.

[0044] Example 11:

[0045] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6 parts dimethylethanolamine, 1.5 parts 2-mercaptobenzimidazole, 1.7 parts alginate, 1.7 parts propylene glycol alginate, and 1.6 parts sodium alginate.

[0046] Comparative Example 1:

[0047] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6 parts dimethylethanolamine, and 1.5 parts 2-mercaptobenzimidazole.

[0048] Comparative Example 2:

[0049] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6.5 parts dimethylethanolamine, 1 part 2-mercaptobenzimidazole, 1 part alginate, 2.5 parts propylene glycol alginate, and 1.5 parts sodium alginate.

[0050] Comparative Example 3:

[0051] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 3.5 parts dimethylethanolamine, 3 parts 2-mercaptobenzimidazole, 1 part alginate, 2.5 parts propylene glycol alginate, and 1.5 parts sodium alginate.

[0052] Comparative Example 4:

[0053] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6.5 parts dimethylethanolamine, 1 part alginic acid, 2.5 parts propylene glycol alginate, and 1.5 parts sodium alginate.

[0054] Comparative Example 5:

[0055] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 6.5 parts 2-mercaptobenzimidazole, 1 part alginic acid, 2.5 parts propylene glycol alginate, and 1.5 parts sodium alginate.

[0056] Comparative Example 6:

[0057] A special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 10 parts sodium tripolyphosphate, 15 parts sodium silicate, 20 parts sodium percarbonate, 10 parts sodium chloride, 10 parts sodium pyrophosphate, 20 parts trisodium phosphate, 4 parts sodium citrate, 0.5 parts octyltrimethylammonium chloride, 1 part alginic acid, 2.5 parts propylene glycol alginate, and 1.5 parts sodium alginate.

[0058] The preparation methods of the cleaning agents for sulfur concentrate ceramic filter plates in Examples 1-11 and Comparative Examples 1-6 include the following steps:

[0059] (1) Add the chelating agent, alginate stabilizer and surfactant to the reaction vessel at a temperature of 50°C and perform ultrasonic vibration at a frequency of 20KHz for 5 minutes.

[0060] (2) Add the cleaning agent, corrosion inhibitor and water to the reaction system of step (1), and perform ultrasonic vibration (the frequency of ultrasonic vibration is 20KHz, and the vibration is continuous for 5 minutes). Then cool to room temperature to obtain the special cleaning agent for sulfur concentrate ceramic filter plate.

[0061] The cleaning agents from Examples 1-11 and Comparative Examples 1-6 were added to water and stirred at room temperature for 10 minutes to prepare a 6% (w / w) aqueous solution. Taking the sulfur concentrate from Tianhua Mining Co., Ltd. in Dayi City as an example, the sulfur concentrate was filtered using a TC513-004 ceramic filter. Filtration was stopped when the filtration efficiency reached 35%, and a new filter plate with a 100% filtration efficiency was replaced. This process was repeated to obtain 17 filter plates with the same degree of clogging. The replaced filter plates were then cleaned using the cleaning agent aqueous solutions from Examples 1-10 and Comparative Examples 1-7 prepared above, following the cleaning method described below:

[0062] How to use:

[0063] Step 1: Rinse the filter tank with clean water while it is stopped. Connect the cleaning agent solution directly to the original filter acid pump inlet and adjust the acid pump metering scale as needed.

[0064] Step 2: Start the filter rotor to drive the filter plates to rotate. The ceramic filter plates and composite filter plates pass through the tank periodically.

[0065] Step 3: Intermittently start the ultrasonic cleaning device for cleaning, with the interval time set to 15-25 minutes per hour;

[0066] Step 4: The cleaning time is about 1.5-2 hours. When the liquid adsorbed on the surface of the filter plate dries quickly after it is removed from the tank, it indicates that the filter plate's permeability has been well restored. The cleaning is then complete, and the cleaning solution is discharged.

[0067] Step 5: Start the backwashing program, rinse with clean water for several minutes and then stop. Normal production filtration can then begin.

[0068] After cleaning, the cleaned filter plates were compared in terms of cleaning cycle, post-cleaning filtration efficiency, and service life. The results are shown in Tables 1 to 4.

[0069] Cleaning cycle: The filter plate needs to be cleaned when the filtration efficiency is less than 35% during normal use. The time interval between each cleaning is one cleaning cycle.

[0070] Filtration efficiency after cleaning: The filtration efficiency of the filter plate after cleaning compared to a new filter plate.

[0071] Service life: The filter plate should be discarded when its filtration efficiency is less than 30% of that of a new filter plate after cleaning. This service life is the time during which the filter plate is used.

[0072] Table 1

[0073]

[0074]

[0075] Table 2

[0076] Cleaning cycle (hours) 7.5 8.5 8 9 9.5 Filtration efficiency after cleaning 80％ 88％ 83％ 88％ 90％ Service life (months) 7.5 8.5 8 8.5 9

[0077] Table 3

[0078] Cleaning cycle (hours) 10 5 8.5 9 Filtration efficiency after cleaning 90％ 65％ 75％ 75％ Service life (months) 9 5.5 7 7

[0079] Table 4

[0080] Cleaning cycle (hours) 7.5 7 5.5 Filtration efficiency after cleaning 70％ 70％ 68％ Service life (months) 6 6 6

[0081] As can be seen from the comparison of Examples 4-6 and Comparative Example 1, when using alginate stabilizers as cleaning agent components, the cleaning cycle of the filter plate can be extended, and the filtration efficiency and service life of the filter plate after cleaning can be improved, thereby improving the cleaning efficiency of the filter plate.

[0082] A comparison of Examples 1 and 4-7 shows that when the alginate stabilizers are selected as alginate, propylene glycol alginate, and sodium alginate, and the ratio of alginate, propylene glycol alginate, and sodium alginate is within a suitable range, the cleaning agent prepared can extend the cleaning cycle of the filter plate, further improve the filtration efficiency of the filter plate (up to 98%), and significantly extend the service life of the filter plate.

[0083] As can be seen from the comparison of Example 1 and Comparative Examples 2-6, when the mass ratio of alkanolamine corrosion inhibitor to benzimidazole corrosion inhibitor is within a suitable range, the cleaning agent prepared can improve the cleaning cycle, filtration efficiency and service life of the filter plate after cleaning.

[0084] As can be seen from the comparison of Examples 1-3, the cleaning agent prepared using the components and weight parts provided in this application has significantly improved the cleaning cycle, filtration efficiency after cleaning, and service life, thus making the cleaning effect of the cleaning agent better. In addition, since the cleaning agent provided in this application does not use strong acids such as nitric acid, it does not corrode the equipment, sealing rings, plastic parts and other components when cleaning ceramic filter plates.

[0085] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A special cleaning agent for sulfur concentrate ceramic filter plates, characterized in that: The special cleaning agent for sulfur concentrate ceramic filter plates comprises the following raw materials in parts by weight: 80-90 parts of cleaning agent, 3-6 parts of chelating agent, 0.05-0.5 parts of surfactant, 1.5-8 parts of corrosion inhibitor, and 2-5 parts of alginic acid stabilizer. The corrosion inhibitor comprises an alcohol amine corrosion inhibitor and a benzimidazole corrosion inhibitor in a mass ratio of 3:1; The alginate stabilizer is a mixture comprising alginate, propylene glycol alginate, and sodium alginate; The mass ratio of alginate, propylene glycol alginate, and sodium alginate is 1:4:3; The alkanolamine corrosion inhibitor is at least one of dimethylethanolamine and diethylene glycolamine; The cleaning agent is at least one of sodium tripolyphosphate, sodium silicate, sodium percarbonate, sodium chloride, sodium pyrophosphate, and trisodium phosphate.

2. The cleaning agent for sulfur concentrate ceramic filter plates according to claim 1, characterized in that: The chelating agent is at least one of sodium citrate and tetrasodium ethylenediaminetetraacetate.

3. The cleaning agent for sulfur concentrate ceramic filter plates according to claim 1, characterized in that: The surfactant is at least one of octyltrimethylammonium chloride, nonylphenol polyoxyethylene ether, sorbitol polyoxyethylene ether monooleate, and sodium dodecyl polyoxyethylene ether sulfate.

4. The cleaning agent for sulfur concentrate ceramic filter plates according to claim 1, characterized in that: The benzimidazole corrosion inhibitor is at least one of 2-aminobenzimidazole, 2-methylbenzimidazole, and 2-mercaptobenzimidazole.

5. A method for preparing a special cleaning agent for sulfur concentrate ceramic filter plates according to any one of claims 1-4, characterized in that: Includes the following steps: (1) Add the chelating agent, alginate stabilizer and surfactant to the reaction vessel at a temperature of 35-60℃ and perform ultrasonic vibration; (2) Add the cleaning agent, corrosion inhibitor and water to the reaction system of step (1), and after ultrasonic vibration, cool to room temperature to obtain the special cleaning agent for sulfur concentrate ceramic filter plate.

6. The application of the cleaning agent for sulfur concentrate ceramic filter plates according to any one of claims 1-4 in the cleaning field.

Images