A kind of silicon quick-drying material and application method thereof

Abstract

The present application relates to the technical field of recycling and reusing steelmaking waste, and specifically discloses a siliceous quick-drying material and an application method thereof, wherein the siliceous quick-drying material is obtained by mixing the following raw materials in weight percentage, based on the total weight of the siliceous quick-drying material: 90-99% silicon powder; 1-10% quick-drying agent; the quick-drying agent includes calcium oxide, sodium hydroxide and sodium carbonate, and the weight ratio of the calcium oxide, sodium hydroxide and sodium carbonate is 1: (0.01-0.3): (0.01-0.2). The siliceous quick-drying material of the present application has the advantages of fast drying speed and compensation of molten steel temperature.

Description

Technical Field

[0001] The present application relates to the technical field of recycling and reusing steelmaking waste, and in particular to a siliceous quick-drying material and an application method thereof. Background Art

[0002] Waste is often generated during the production process of the metallurgical industry. The main sources of waste include dust collected by the dust removal system during the steel smelting process, steel slag produced by molten steel splashing, and iron oxide scale produced during the steelmaking process. These wastes contain rich recyclable iron resources, so they need to be recycled to reduce resource waste.

[0003] By adding a certain amount of waste during the steelmaking process, waste recycling can be achieved, but the waste itself is cold material. Adding it to the steelmaking furnace will lower the temperature of the molten steel during steelmaking, which is not conducive to improving the quality of steelmaking. Especially when the proportion of waste added is high, the impact on the temperature of the molten steel in the steelmaking furnace is more obvious. Therefore, it is necessary to reduce the situation where the temperature in the steelmaking furnace is lowered due to the addition of waste. Summary of the invention

[0004] In order to reduce the temperature drop in a steelmaking furnace caused by waste material feeding, the present application provides a siliceous quick-drying material and an application method thereof.

[0005] In the first aspect, the present application provides a siliceous quick-drying material, which adopts the following technical solution:

[0006] A siliceous quick-drying material, which is obtained by mixing the following raw materials in percentage by weight, based on the total weight of the siliceous quick-drying material:

[0007] Silicon powder 90-99%;

[0008] Quick-drying agent 1-10%;

[0009] The quick-drying agent comprises calcium oxide, sodium hydroxide and sodium carbonate, and the weight ratio of the calcium oxide, sodium hydroxide and sodium carbonate is 1:(0.01-0.3):(0.01-0.2).

[0010] By adopting the above technical scheme, the waste is first mixed with the silicon quick-drying material for pretreatment before recycling and reuse, so that the temperature of the waste is not likely to drop after being added to the steel-making furnace. The silicon quick-drying material plays a role in temperature compensation, thereby ensuring the steel-making effect. In addition, in order to ensure that the silicon quick-drying material can be well combined with the waste, it is necessary to add water and adhesive to stir during the mixing process of the silicon quick-drying material and the waste, and then dry and shape them before putting them into the steel-making furnace for reuse. In addition, the waste itself has a certain amount of moisture without being dried, and splashing is easy to occur if moisture is added during the steel-making process. This requires that the silicon quick-drying material and the waste put into the steel-making furnace must not contain moisture. If the waste is heated and dried, the production cost will increase.

[0011] The silicon powder in the siliceous quick-drying material acts as a heating agent and can compensate the temperature of the molten steel during the steelmaking process; the quick-drying agent ensures that the moisture in the siliceous quick-drying material and waste materials can be fully removed, and there is no need to use additional drying equipment for drying, which saves costs.

[0012] When the quick-drying agent is mixed with water, calcium oxide reacts with water to produce calcium hydroxide and releases a large amount of heat, and calcium hydroxide continues to react with sodium carbonate to produce calcium carbonate and sodium hydroxide. Sodium carbonate also produces sodium hydroxide and releases heat during the contact process with water, which helps to reduce the amount of sodium hydroxide added in the quick-drying agent. Sodium hydroxide also releases heat during the process of dissolving in water, so that the water can be quickly consumed and evaporated quickly in the exothermic reaction, achieving a quick-drying effect.

[0013] Optionally, the quick-drying agent also includes aluminum powder, and the weight ratio of the calcium oxide to the aluminum powder is 1:(0.01-1).

[0014] By adopting the above technical solution, the addition of aluminum powder helps to improve the quality of steel. The oxidation process of aluminum powder is an exothermic process, which can further realize the rapid evaporation of water and achieve the effect of quick drying. In addition, aluminum powder and silicon powder can play a role of temperature compensation in the steelmaking process, reducing the situation where the temperature of the molten steel is lowered due to the addition of cold waste.

[0015] Optionally, the quick-drying agent further comprises microcrystalline wax, and the weight ratio of the calcium oxide to the microcrystalline wax is 1:(0.2-0.4).

[0016] By adopting the above technical scheme, the microcrystalline wax has the effect of bonding the siliceous quick-drying material and the waste material, so that it can be better formed during the pressing process, and the hydrophobicity of the microcrystalline wax itself helps to form a hydrophobic surface after the evaporation of water, and in the process of the exothermic reaction of the raw materials in the quick-drying agent and water, the microcrystalline wax melts and further plays the effect of bonding the siliceous quick-drying material and the waste material, ensuring the effect of temperature compensation, while enhancing the hydrophobicity of the siliceous quick-drying material and the waste material, and reducing the occurrence of active moisture absorption.

[0017] In a second aspect, the present application provides an application method of a siliceous quick-drying material, which adopts the following technical solution:

[0018] A method for applying a siliceous quick-drying material comprises the following steps: mixing the siliceous quick-drying material with waste to obtain powder, wherein the mixing weight ratio of the siliceous quick-drying material to the waste is (20-80): (80-20), adding water after mixing to mix evenly, wherein the weight ratio of the powder to the water is 1: (0.01-0.1), adding an adhesive, wherein the adhesive is a phenolic resin, and the weight ratio of the powder to the adhesive is 1: (0.01-0.05), then putting the mixture into a pressing device for pressing and forming to obtain a pressed body, placing the mixture naturally until fully dried, and putting the mixture into molten steel of a steelmaking device for smelting to realize the recycling and reuse of the waste.

[0019] By adopting the above technical scheme, when the waste is put into the steel-making furnace for recycling, the silicon quick-drying material is first added for pretreatment, and then pressed into shape by adding water and mixing, so as to ensure that the silicon quick-drying material is in full contact with the waste, so that the moisture in the waste is discharged, and it is convenient for the reuse of the waste. After pressing, the waste and the silicon quick-drying material can be fully dried by being left naturally without the aid of heating and drying equipment, thereby ensuring that when added to the steel-making furnace, there will be no splashing due to the presence of moisture, which will affect the quality of steelmaking.

[0020] Optionally, the waste material is dust ash, steel slag, ball-milled iron or iron oxide scale.

[0021] By adopting the above technical scheme, dust, steel slag and ball-milled iron contain a large amount of pure iron, and iron oxide scale contains a large amount of iron oxide. The above waste materials can be recycled and processed, which can not only ensure the temperature maintenance during steel smelting, ensure the deoxidation and desulfurization of molten steel at a specific high temperature, but also reduce the production cost of molten steel.

[0022] Optionally, the pressed body after pressing is in the shape of a block, a sphere or a cake.

[0023] By adopting the above technical scheme, after the siliceous quick-drying material and the waste material are pressed into shape, the quick-drying agent in the siliceous quick-drying material reacts with water to release heat, and while evaporating the water, an exhaust channel is left in the pressed body. When the pressed body is fed into the steelmaking furnace, the molten steel can quickly infiltrate the pressed body, achieving uniform dispersion of the pressed body in the molten steel, thereby ensuring the heat compensation effect.

[0024] Optionally, the average diameter of the pressed body is 2-10 cm.

[0025] By adopting the above technical solution, when the size of the pressed body is within this range, the drying effect of the siliceous quick-drying material on the waste can be guaranteed, and the uniform dispersion of the pressed body in the steelmaking furnace can be guaranteed to ensure the smelting effect.

[0026] Optionally, the weight ratio of waste materials in the steelmaking equipment to molten steel is 20-30%.

[0027] By adopting the above technical solution, the feeding amount of the waste material is within this range, and the siliceous quick-drying material can ensure that the addition of the waste material will not affect the smelting temperature of the molten steel, thereby ensuring the steel smelting effect.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. As a heating agent, silicon powder can compensate the temperature of molten steel during the steelmaking process; quick-drying agent ensures that the moisture in silicon quick-drying material and waste can be fully removed, and no additional drying equipment is required for drying, thus saving costs;

[0030] 2. When the quick-drying agent is mixed with water, calcium oxide reacts with water to produce calcium hydroxide and release a large amount of heat, and calcium hydroxide continues to react with sodium carbonate to produce calcium carbonate and sodium hydroxide. Sodium carbonate also produces sodium hydroxide and releases heat during the contact process with water, which helps to reduce the amount of sodium hydroxide added in the quick-drying agent. In addition, heat is also released during the process of sodium hydroxide dissolving in water, so that water can be quickly consumed and evaporated quickly in the exothermic reaction, achieving a quick-drying effect;

[0031] 3. The method of the present application comprises mixing the silicon quick-drying material of the present application with waste materials and adding water to form the mixture, and then naturally drying the mixture for 4-12 hours before putting the mixture into a steelmaking furnace for recycling. The method has the effects of fast drying speed, saving production costs, and compensating for the temperature of the molten steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the shape of the pressed body in Application Examples 1.1-1.3. DETAILED DESCRIPTION

[0033] Source of raw materials:

[0034] Silicon powder CAS number: 69012-64-2, particle size 5-15mm, elemental silicon content 38-50wt%;

[0035] Calcium oxide CAS number: 1305-78-8, particle size 5-10mm;

[0036] Sodium hydroxide CAS number: 1310-73-2, particle size 5-10mm;

[0037] Sodium carbonate CAS number: 497-19-8, particle size 5-10mm;

[0038] Aluminum powder CAS number: 7429-90-5, particle size 10-15mm;

[0039] Microcrystalline wax CAS number: 8001-75-0, particle size 0-5mm;

[0040] The main components of the waste are as follows:

[0041]

[0042] Example

[0043] Examples 1.1-1.3

[0044] A siliceous quick-drying material, which is obtained by mixing the following raw materials by weight, based on the total weight of the siliceous quick-drying material:

[0045] Silicon powder 90kg, 95kg, 99kg;

[0046] Quick-drying agent 1kg, 5kg, 10kg;

[0047] The quick-drying agent comprises calcium oxide, sodium hydroxide and sodium carbonate in a weight ratio of 1:(0.01-0.3):(0.01-0.2).

[0048] The particle size of the prepared siliceous quick-drying material is 0-20 mm.

[0049] The raw material dosage of the siliceous quick-drying material of Examples 1.1-1.3 is shown in Table 1.

[0050] Table 1 Raw material dosage of siliceous quick-drying material of Examples 1.1-1.3

[0051]

[0052] Examples 2.1-2.3

[0053] A siliceous quick-drying material, which is different from Example 1.2 in that aluminum powder is also added to the quick-drying agent, and the weight ratio of calcium oxide to aluminum powder is 1:(0.01-1);

[0054] In Example 2.1, the weight ratio of calcium oxide to aluminum powder is 1:0.01, and the amount of aluminum powder added is 0.0413 kg;

[0055] In Example 2.2, the weight ratio of calcium oxide to aluminum powder is 1:0.1, and the amount of aluminum powder added is 0.413 kg;

[0056] In Example 2.3, the weight ratio of calcium oxide to aluminum powder is 1:1, and the amount of aluminum powder added is 4.13 kg.

[0057] Examples 3.1-3.3

[0058] A siliceous quick-drying material, which is different from Example 2.2 in that microcrystalline wax is also added to the quick-drying agent, and the weight ratio of calcium oxide to microcrystalline wax is 1:(0.2-0.4);

[0059] In Example 3.1, the weight ratio of calcium oxide to microcrystalline wax is 1:0.2, and the amount of microcrystalline wax added is 0.826 kg;

[0060] In Example 3.2, the weight ratio of calcium oxide to microcrystalline wax is 1:0.3; the amount of microcrystalline wax added is 1.239 kg;

[0061] In Example 3.3, the weight ratio of calcium oxide to microcrystalline wax is 1:0.4, and the amount of microcrystalline wax added is 1.652 kg.

[0062] Comparative Example 1

[0063] A siliceous quick-drying material, which is different from Example 1.2 in that the amount of silicon powder used is 0 kg.

[0064] Comparative Example 2

[0065] A siliceous quick-drying material, which is different from Example 1.2 in that the amount of calcium oxide used is 0 kg.

[0066] Comparative Example 3

[0067] A siliceous quick-drying material, which is different from Example 1.2 in that calcium oxide is replaced by an equal amount of magnesium oxide.

[0068] Comparative Example 4

[0069] A siliceous quick-drying material, which is different from Example 1.2 in that the amount of sodium hydroxide used is 0 kg.

[0070] Comparative Example 5

[0071] A siliceous quick-drying material, which is different from Example 1.2 in that the amount of sodium carbonate used is 0 kg.

[0072] Comparative Example 6

[0073] A siliceous quick-drying material, which is different from Example 1.2 in that an equal amount of calcium carbonate is used to replace sodium carbonate.

[0074] Comparative Example 7

[0075] A siliceous quick-drying material, which is different from Example 2.2 in that an equal amount of magnesium powder is used to replace aluminum powder.

[0076] Comparative Example 8

[0077] A siliceous quick-drying material, which is different from Example 3.2 in that an equal amount of paraffin wax is used to replace microcrystalline wax.

[0078] Application Examples 1.1-1.3

[0079] A method for applying a siliceous quick-drying material comprises the following steps:

[0080] The siliceous quick-drying material is mixed with the waste material, the weight ratio of the siliceous quick-drying material to the waste material is 30:70, and water is added after mixing, the material-water ratio is 1:0.06, and then a binder is added, the binder is phenolic resin, and the weight ratio of the powder to the binder is 1:0.03, and then put into a pressing machine for pressing and molding to obtain a pressed body, the shape of the pressed body is spherical, such as Figure 1 As shown, the average diameter of the pressed bodies is 5 cm. The pressed bodies are naturally stacked and placed until they are fully dried, and then put into the molten steel in a steelmaking furnace for producing siliceous steel for smelting. The smelting temperature of the molten steel is 1600°C, and the amount of pressed bodies put in is 1 ton, so that the weight ratio of waste in the steelmaking furnace to the molten steel is 30%, thereby realizing the recycling and reuse of waste.

[0081] Wherein, the waste material is the collected dust ash;

[0082] The siliceous quick-drying material in Application Example 1.1 is prepared by Example 1.1;

[0083] The siliceous quick-drying material in Application Example 1.2 is prepared by Example 1.2;

[0084] The siliceous quick-drying material in Application Example 1.3 is prepared by Example 1.3;

[0085] Application Examples 2.1-2.3

[0086] An application method of a siliceous quick-drying material is different from that of Application Example 1.2 in that the siliceous quick-drying materials of Application Examples 2.1-2.3 are prepared sequentially from Examples 2.1-2.3.

[0087] Application Examples 3.1-3.3

[0088] An application method of a siliceous quick-drying material is different from that of Application Example 1.2 in that the siliceous quick-drying materials of Application Examples 3.1-3.3 are prepared sequentially from Examples 3.1-3.3.

[0089] Comparative Application Examples 1-8

[0090] An application method of a siliceous quick-drying material, which is different from Application Example 1.2 in that the siliceous quick-drying material is prepared in sequence from Comparative Examples 1-8.

[0091] Performance testing

[0092] The tests include:

[0093] 1. Drying time test

[0094] After the application examples and comparative application examples are made into pressed blocks, 10 kg of the initially pressed blocks are taken respectively, placed in a naturally ventilated environment, weighed every 30 minutes, and the weighed weight is recorded until the weighed weight remains constant, indicating that the blocks are completely dried;

[0095] By counting the time required for the weight to remain constant, the longer the time, the worse the drying effect, and the shorter the time, the faster the drying effect.

[0096] 2. Temperature compensation effect test

[0097] During the smelting process of molten steel, the initial molten steel temperature is recorded. After adding the pressing block, the molten steel temperature is measured again and the temperature variation range is calculated.

[0098] Temperature compensation tests were performed on the corresponding use cases 1.1-1.3 and comparative application example 1. The test results are shown in Table 2.

[0099] Table 2 Temperature compensation test results of application examples 1.1-1.3 and comparative application example 1

[0100] Temperature change after adding the pressed block / ℃ Application Example 1.1 Molten steel temperature increased by 8℃ Application Example 1.2 Molten steel temperature increased by 8℃ Application Example 1.3 Molten steel temperature increased by 8℃ Comparative application example 1 The temperature of the molten steel drops by 50℃

[0101] Combining Application Examples 1.1-1.3 and Comparative Application Example 1 and Table 2, it can be seen that the addition of silicon powder helps to compensate for the temperature when waste is added, and the addition of silicon powder enhances the performance of silicon steel and ensures the quality of steel products.

[0102] Drying time tests were conducted for Example 1.2 and Comparative Application Examples 2-6. The test results are shown in Table 3.

[0103] Table 3 Drying time test results of application example 1.2 and comparative application examples 2-6

[0104] Drying time required for constant weight of pressed blocks Application Example 1.2 5h30min Comparative Application Example 2 8h30min Comparative Application Example 3 7h30min Comparative Application Example 4 5h30min Comparative Application Example 5 9h30min Comparative Application Example 6 8h30min

[0105] It can be seen from the combination of application example 1.2 and comparative application examples 2-6 and Table 3 that the quick-drying agent in the siliceous quick-drying material plays a role in enhancing the drying effect. The siliceous quick-drying material is added in the form of pressed blocks with the waste material, which can ensure that the moisture in the siliceous quick-drying material and the waste material can be fully removed, and no additional drying equipment is required for drying, which saves costs.

[0106] The calcium oxide added in the present application reacts with water to produce calcium hydroxide and release a large amount of heat, and the calcium hydroxide continues to react with sodium carbonate to generate calcium carbonate and sodium hydroxide. Sodium hydroxide is also produced and heat is released during the contact between sodium carbonate and water, which helps to reduce the amount of sodium hydroxide added in the quick-drying agent. Heat is also released during the process of sodium hydroxide dissolving in water, so that water can be quickly consumed and quickly evaporated in the exothermic reaction, thereby achieving a quick-drying effect.

[0107] The temperature compensation and drying time of the corresponding application examples 2.1-2.3 and the comparative application example 7 were tested, and the test results are shown in Table 4. Table 4 Temperature compensation and drying time test results of application examples 2.1-2.3 and comparative application example 7

[0108] Temperature changes after the pressed blocks are added Drying time required for constant weight of pressed blocks Application Example 2.1 The temperature of molten steel drops by 10℃ 4h30min Application Example 2.2 The temperature of molten steel drops by 10℃ 4h30min Application Example 2.3 The temperature of molten steel drops by 10℃ 4h30min Comparative Application Example 7 The temperature of the molten steel drops by 150℃ 6h30min

[0109] Combining Application Example 1.2 and Application Examples 2.1-2.3 and Comparative Application Example 7 and Tables 2 and 4, it can be seen that the addition of aluminum powder plays an auxiliary effect on temperature compensation, while further improving the drying effect and shortening the drying time; and the addition of aluminum powder helps to improve the quality of steel. The oxidation process of aluminum powder is an exothermic process, which can further realize the rapid evaporation of water and achieve the effect of quick drying. In addition, aluminum powder and silicon powder can play a role in temperature compensation in the steelmaking process, reducing the situation where the temperature of the molten steel is lowered due to the addition of cold waste.

[0110] Drying time tests were conducted for Example 3.1-3.3 and Comparative Application Example 8. The test results are shown in Table 5.

[0111] Table 5 Drying time test results of application examples 3.1-3.3 and comparative application example 8

[0112]

[0113]

[0114] Combining Application Example 1.2 and Application Examples 3.1-3.3 and Comparative Application Example 8 and Tables 3 and 5, it can be seen that the addition of microcrystalline wax enables better bonding between the siliceous quick-drying material and the waste material, ensuring their molding effect. Microcrystalline wax has better toughness than paraffin wax, so it can better promote the bonding between the particles and ensure that the pressed block has good hydrophobicity; the microcrystalline wax has the effect of bonding the siliceous quick-drying material and the waste material, enabling better molding during the pressing process, and the hydrophobicity of the microcrystalline wax itself helps the volatilization of water, and in the process of the exothermic reaction of the raw materials in the quick-drying agent mixed with water, the microcrystalline wax melts and further bonds the siliceous quick-drying material and the waste material, ensuring the effect of temperature compensation, while enhancing the hydrophobicity of the siliceous quick-drying material and the waste material, reducing the occurrence of active moisture absorption.

[0115] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A siliceous quick-drying material, characterized in that: Based on the total weight of the siliceous quick-drying material, the following raw materials in weight percentage are mixed to obtain: Silicon powder 90-99%; Quick-drying agent 1-10%; The quick-drying agent comprises calcium oxide, sodium hydroxide and sodium carbonate, and the weight ratio of the calcium oxide, sodium hydroxide and sodium carbonate is 1: (0.01-0.3): (0.01-0.2); The quick-drying agent also includes aluminum powder, and the weight ratio of calcium oxide to aluminum powder is 1: (0.01-1); The quick-drying agent also includes microcrystalline wax, and the weight ratio of the calcium oxide to the microcrystalline wax is 1:(0.2-0.4).

2. An application method of a siliceous quick-drying material, characterized in that: The following steps are involved: The siliceous quick-drying material according to claim 1 is mixed with waste to obtain a powder, wherein the mixing weight ratio of the siliceous quick-drying material to the waste is (20-80): (80-20), and water is added after mixing to mix well, wherein the weight ratio of the powder to water is 1: (0.01-0.1), and then an adhesive is added, wherein the adhesive is a phenolic resin, and the weight ratio of the powder to the adhesive is 1: (0.01-0.05), and then the mixture is put into a pressing device for pressing and forming to obtain a pressed body, which is naturally placed until fully dried, and then put into the molten steel of a steelmaking device for smelting to realize the recycling and reuse of the waste.

3. The application method of the siliceous quick-drying material according to claim 2, characterized in that: The waste materials are dust, steel slag, ball-milled iron particles or iron oxide scale.

4. The application method of the siliceous quick-drying material according to claim 2, characterized in that: The pressed body after the pressing is in the shape of a block, a sphere or a cake.

5. The application method of the siliceous quick-drying material according to claim 4, characterized in that: When the pressed body is spherical, the average diameter is 2-10 cm.

6. The application method of the siliceous quick-drying material according to claim 2, characterized in that: The weight ratio of waste materials in the steelmaking equipment to molten steel is 20-30%.

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