A magnesium stearate modified washing material and a method for recycling the washing material

Abstract

The application discloses a magnesium stearate modified cleaning material and a recycling cleaning method thereof, and belongs to the technical field of powder equipment cleaning. In view of the problems of poor flowability of double-flying powder and cement cleaning material, uncleaned dead angle, multiple cleaning, large amount of waste material, complicated recycling, and high production cost in the production change cleaning process of the existing dry powder mixer, the magnesium stearate is used to dry modify the double-flying powder and cement cleaning base material, so that the powder flowability and dispersibility are improved. The modified cleaning material has strong flushing capacity, good penetration dead angle capacity, and excellent cleaning effect; and is especially suitable for the production change cleaning scene of sand-containing dry powder products, and after cleaning, the mixed sand particles can be removed through simple screening, the performance of the purified modified cleaning material is good, the modified cleaning material can be stably recycled for multiple times, and the addition of an additive or secondary modification treatment is not needed, so that the cleaning frequency and cleaning waste material are greatly reduced, the production change cost of the dry powder is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of powder production equipment cleaning technology, specifically relating to a magnesium stearate modified cleaning material and a method for its circulating cleaning. Background Technology

[0002] In the production of dry powder mortar, putty powder, and sand-containing dry powder, the dry powder mixer needs to be cleaned when switching between different formulations to prevent mixing from affecting product quality. The industry conventionally uses double-flying powder and cement as cleaning materials, but these powder particles have high friction and poor flowability, resulting in significant residues in the dead corners of the mixing chamber, the base of the mixing shaft, and the gaps between the impeller blades. A single cleaning is insufficient, requiring multiple cleaning cycles, leading to a large consumption of cleaning materials.

[0003] Especially in the scenario of switching production of sand-containing dry powder products, common sand-containing dry powder products include plastering mortar, bonding mortar, and masonry mortar, whose sand particle size is usually distributed in the range of 0.075 mm to 4.75 mm. Traditional washing materials, after washing sand-containing products, will be mixed with a large number of sand particles, completely losing their reuse value and can only be directly scrapped, resulting in greater waste and higher production costs. Powder after multiple washings is mixed with various residues and cannot be used normally in production, and is basically all scrapped, generating a large amount of waste and increasing production costs. The small amount of recyclable powder requires complex processes such as screening, impurity removal, and re-blending, resulting in low recycling cost-effectiveness.

[0004] Existing technologies mostly improve the mechanical cleaning structure, such as adding scraper devices, air blowing devices, or vibration mechanisms. However, the cost of equipment improvement is high and cannot fundamentally solve the problems of poor powder flowability, multiple washing cycles, and a lot of sand-containing washing waste. Summary of the Invention

[0005] This invention aims to overcome the shortcomings of existing dry powder mixers, such as incomplete cleaning of the washing chamber, repeated washing, large amount of waste material from washing sand-containing products, cumbersome reuse, and high cost. It provides a magnesium stearate-modified washing material and its recycling washing method. By improving the flowability of the washing material powder, it achieves efficient washing and is suitable for production changeover conditions of sand-containing products. It can quickly remove sand, purify and recycle powder, and significantly reduce production costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The first objective of this invention is: A method for circulating washing materials modified with magnesium stearate is provided, which includes the following steps: S1. Ingredients: Select a cleaning substrate, wherein the cleaning substrate is either double-flying powder or cement; Adding 0.3% to 0.5% by weight of magnesium stearate powder to the washing substrate yields a washing mixture powder. S2. Dry modification preparation: The washing and mixing powder is placed in a ball mill and ground for 10-15 minutes to uniformly coat the surface of the washing substrate with magnesium stearate powder. Then, it is sieved with an 80-100 mesh screen to remove agglomerates and lumps, thus obtaining the modified washing material. S3. Warehouse cleaning operation: Add the modified washing material to the dry powder mixer and stir and rinse for 5-8 minutes to complete the cleaning of the silo body, stirring paddle and dead corner residue; S4. Reusable: After cleaning ordinary powder products, the modified cleaning material is sealed and stored for recycling. After cleaning the dry powder products containing sand, the mixed sand particles and impurities are removed by sieving through a sieve, and the resulting modified washing material is then sealed and stored for recycling.

[0007] A further optimization of the magnesium stearate-modified silo cleaning material recycling method described in this invention is as follows: The magnesium stearate powder added to the washing substrate accounts for 0.3% by mass.

[0008] A further optimization of the magnesium stearate-modified silo cleaning material recycling method described in this invention is as follows: The magnesium stearate has a mesh size of 150-200 and a moisture content of ≤0.3%.

[0009] A further optimization of the magnesium stearate-modified silo cleaning material recycling method described in this invention is as follows: The double-flying powder has a mesh size of 200-400 and a whiteness of ≥80%.

[0010] A further optimization of the magnesium stearate-modified silo cleaning material recycling method described in this invention is as follows: The cement is PO 42.5 grade or PO 52.5 grade silicate cement.

[0011] A further optimization of the magnesium stearate-modified silo cleaning material recycling method described in this invention is as follows: The ball mill operates at a speed of 30–60 r / min and has a ball-to-material ratio of 1:1–3:1.

[0012] A further optimization of the magnesium stearate-modified silo cleaning material recycling method described in this invention is as follows: The modified washing material can be recycled 10 to 15 times without the need for additional additives or secondary modification.

[0013] A further optimization of the magnesium stearate-modified silo cleaning material recycling method described in this invention is as follows: After cleaning sand-containing dry powder products, the sand is removed by screening through a 40-60 mesh sieve, so that the sand particles are completely separated from the modified washing material, ensuring the fluidity of the recycled modified washing material and removing particulate impurities.

[0014] A further optimization of the magnesium stearate-modified silo cleaning material recycling method described in this invention is as follows: Before each cycle of use, the modified washing material is sieved through an 80-100 mesh screen to remove powder lumps or other particulate impurities and increase the uniformity of powder particle size.

[0015] The magnesium stearate-modified washing material circulation washing method of the present invention achieves a single washing dead corner residual material removal rate of ≥99% after the washing operation in step S3.

[0016] The second objective of this invention is: A magnesium stearate modified septic tank cleaning material is provided, comprising a septic tank cleaning substrate and magnesium stearate powder coated on the surface of the septic tank cleaning substrate; the septic tank cleaning substrate is any one of double-flying powder and cement; the mass of the magnesium stearate powder accounts for 0.3% to 0.5% of the total mass of the septic tank cleaning substrate.

[0017] This invention utilizes magnesium stearate to dry-modify double-fly powder and cement silo cleaning substrates, improving powder flowability and dispersibility. The modified silo cleaning material exhibits strong scouring ability and excellent penetration into dead zones, resulting in superior silo cleaning performance. It is particularly suitable for changing production cleaning scenarios involving sand-containing dry powder products. After silo cleaning, impurities such as sand particles can be removed through simple sieving. The purified modified silo cleaning material retains its excellent properties and can be stably recycled multiple times without the need for additional additives or secondary modification treatment. This significantly reduces the number of silo cleaning cycles and silo cleaning waste, lowering the cost of changing production in dry powder and improving production efficiency. This invention is simple to operate, highly adaptable, and energy-efficient, suitable for changing production cleaning in various dry powder mixers.

[0018] Compared with the prior art, the present invention has the following technical features and technical effects: (1) Add 0.3% to 0.5% magnesium stearate to the double-fly powder and cement base material, and grind it in a ball mill for 10 to 15 minutes to make it evenly coat the surface of the base material. The fluidity of the modified silo cleaning material is significantly improved. It can penetrate into the silo body and dead corner area within 5 to 8 minutes of stirring and rinsing. The removal rate of dead corner residue in a single silo cleaning is ≥99%, and there is no need to repeat the silo cleaning.

[0019] (2) The particle size of the sand particles is significantly different from that of the modified washing material powder, and they can be efficiently separated by passing through a 40-60 mesh sieve. After separation, the magnesium stearate coating is not damaged, the fluidity is well maintained, and it can be directly recycled, solving the industry pain point that sand-containing washing materials can only be scrapped.

[0020] (3) Modified washing material can be recycled 10 to 15 times without the need for additional additives or secondary modification. It only needs to be screened with an 80 to 100 mesh screen before each recycling.

[0021] (4) By optimizing the formula and process parameters of the washing material, it can be applied to various dry powder mixers and dry powder product switching scenarios, and can also be used for production lines of ordinary powder and sand-containing powder.

[0022] (5) Significantly reduce waste discharge from the washing and reduce raw material consumption. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and comparative experiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Unless otherwise specified, the reagents, equipment, and methods used in this invention are conventional reagents, equipment, and general methods in this technical field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products; conventional auxiliaries whose dosages are not specified are within the appropriate ranges commonly used in this technical field.

[0024] Example 1 (General Scenario) A method for circulating washing of washing materials modified with magnesium stearate includes the following steps: S1. Ingredients: Take 100 kg of double-flying powder (250 mesh, whiteness 80%) as the cleaning base material, and add 0.3% of magnesium stearate powder (180 mesh, moisture content 0.2%) by weight of the base material to obtain the cleaning mixed powder; S2. Dry modification preparation: Add the washing and mixing powder to a ball mill at a speed of 30 r / min and a ball-to-material ratio of 3:1. Grind for 15 minutes to make the magnesium stearate powder uniformly coat the surface of the double-flying powder particles. After grinding, sieve with a 100-mesh screen to remove a small amount of agglomerates and obtain the modified washing material. S3. Cleaning operation: Put the sieved modified cleaning material into the dry powder mixer, stir and rinse for 6 minutes to complete the cleaning of the silo body, stirring paddle and dead corner residue; S4. Recycling: After cleaning ordinary powder products, the modified cleaning material is directly sealed and stored for recycling; after cleaning sand-containing dry powder products, the sand particles are removed by screening with a 50-mesh sieve, and the purified modified cleaning material is then sealed and stored for recycling.

[0025] In this embodiment, the removal rate of residual material in dead corners during a single washing cycle reaches over 99%. The modified washing material can be stably recycled 10-15 times. Before each recycling, it can be directly used after being screened through a 100-mesh sieve, with no significant reduction in washing effect.

[0026] Example 2 (Cement-based substrate scenario) A method for circulating washing of washing materials modified with magnesium stearate includes the following steps: S1. Ingredients: Take cement (PO 42.5 grade) as the washing base material, add 0.3% by weight of magnesium stearate powder (150 mesh, moisture content 0.25%) to obtain the washing mixed powder; S2. Dry modification preparation: Add the silo washing mixture powder into a ball mill at a speed of 50 r / min and a ball-to-material ratio of 2:1, and grind for 15 minutes to uniformly coat the surface of the cement particles with magnesium stearate powder; after grinding, sieve it through a 100-mesh sieve to obtain the modified silo washing material. S3. Washing operation: Put the modified washing material into the dry powder mixer, stir and rinse for 5 minutes to complete the washing; S4. Recycling: After cleaning sand-containing dry powder products, the sand is removed by screening with a 50-mesh sieve. The purified modified washing material is sealed and stored for recycling.

[0027] This embodiment is suitable for cement-based production lines with high-frequency production changes. It has a fast washing speed and the modified washing material can be recycled 10 to 15 times.

[0028] Example 3 (Ultrafine Powder Scenario) A method for circulating washing of washing materials modified with magnesium stearate includes the following steps: S1. Ingredients: Take Shuangfei powder (400 mesh ultrafine powder) as the cleaning base material, add 0.5% of magnesium stearate powder (200 mesh, moisture content 0.1%) by weight of the base material to obtain the cleaning mixed powder; S2. Dry modification preparation: Add the washing and mixing powder to a ball mill at a speed of 60 r / min and a ball-to-material ratio of 3:1. Grind for 10 minutes to uniformly coat the magnesium stearate powder onto the surface of the ultrafine double-flying powder particles. After grinding, sieve the mixture through a 100-mesh sieve to obtain the modified washing material. S3. Washing operation: Put the modified washing material into the dry powder mixer, stir and rinse for 8 minutes to complete the washing; S4. Recycling: After cleaning sand-containing dry powder products, the sand is removed by screening with a 60-mesh sieve. The purified modified washing material is sealed and stored for recycling.

[0029] This embodiment is for ultrafine powder product line. Due to the large specific surface area and easy agglomeration of the substrate itself, a higher proportion of magnesium stearate (0.5%) is used to ensure full coating. The modified washing material can be recycled 10 to 15 times.

[0030] Comparative Example Traditional pure double-flying powder washing material (without magnesium stearate modification) was used to clean sand-containing dry powder products following the same steps. The results showed that after washing, the powder mixed with sand particles could not be separated, the flowability was completely lost, and all of it had to be scrapped; moreover, conventional washing required 3 to 5 repetitions to achieve a basic cleaning effect, and the removal rate of residual material in dead corners after a single washing was only about 70%, resulting in extremely serious material waste.

[0031] The test results for each embodiment and comparative example are shown in Table 1.

[0032] Table 1 Comparison of key process parameters and washing effects in each embodiment and comparative example

[0033] Note: The comparative example uses traditional pure double-fly powder washing material, which has not been modified with magnesium stearate or ball milled. After washing, the powder is mixed with sand particles that cannot be separated, and the washing process needs to be repeated 3 to 5 times. All washing material is then scrapped.

[0034] As can be seen from the comparison, the present invention significantly improves the efficiency of washing and reduces the number of washing operations, while solving the industry problem of difficult subsequent processing of washing materials when switching production of sand-containing products, and has significant economic benefits and technological progress.

[0035] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for circulating washing of silo materials modified with magnesium stearate, characterized in that: Includes the following steps: S1. Ingredients: Select a cleaning substrate, wherein the cleaning substrate is either double-flying powder or cement; Adding 0.3% to 0.5% by weight of magnesium stearate powder to the washing substrate yields a washing mixture powder. S2. Dry modification preparation: The washing and mixing powder is placed in a ball mill and ground for 10-15 minutes to uniformly coat the surface of the washing substrate with magnesium stearate powder. Then, it is sieved with an 80-100 mesh screen to remove agglomerates and lumps, thus obtaining the modified washing material. S3. Warehouse cleaning operation: Add the modified washing material to the dry powder mixer and stir and rinse for 5-8 minutes to complete the cleaning of the silo body, stirring paddle and dead corner residue; S4. Reusable: After cleaning ordinary powder products, the modified cleaning material is sealed and stored for recycling. After cleaning the dry powder products containing sand, the mixed sand particles and impurities are removed by sieving through a sieve, and the resulting modified washing material is then sealed and stored for recycling.

2. The method for circulating washing of silo materials using magnesium stearate-modified washing material according to claim 1, characterized in that: The magnesium stearate powder added to the washing substrate accounts for 0.3% by mass.

3. The method for circulating washing of silo materials using magnesium stearate-modified washing material according to claim 1, characterized in that: The magnesium stearate has a mesh size of 150-200 and a moisture content of ≤0.3%.

4. The method for circulating washing of washing materials using magnesium stearate-modified washing material according to claim 1, characterized in that: The double-flying powder has a mesh size of 200-400 and a whiteness of ≥80%.

5. The method for circulating washing of silo materials using magnesium stearate-modified washing material according to claim 1, characterized in that: The cement is PO 42.5 grade or PO 52.5 grade silicate cement.

6. The method for circulating washing of washing materials using magnesium stearate-modified washing material according to claim 1, characterized in that: The ball mill operates at a speed of 30–60 r / min and has a ball-to-material ratio of 1:1–3:

1.

7. The method for circulating washing of silo materials using magnesium stearate-modified washing material according to claim 1, characterized in that: The modified washing material can be recycled 10 to 15 times without the need for additional additives or secondary modification.

8. The method for circulating washing of silo materials using magnesium stearate-modified washing material according to claim 1, characterized in that: After cleaning the dry powder products containing sand, the sand is removed by screening through a 40-60 mesh sieve, so that the sand particles are completely separated from the modified washing material.

9. The method for circulating washing of silo materials using magnesium stearate-modified washing material according to claim 1, characterized in that: The modified washing material is screened through an 80-100 mesh sieve before each cycle of use.

10. A magnesium stearate-modified silo cleaning material, characterized in that: It comprises a cleaning substrate and magnesium stearate powder coating the surface of the cleaning substrate; the cleaning substrate is either double-flying powder or cement; the magnesium stearate powder accounts for 0.3% to 0.5% of the total mass of the cleaning substrate.

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