Preparation method for preparing ceramsite proppant through industrial solid waste-based nano-reinforced ion exchange

Abstract

The invention provides a method for preparing a ceramsite proppant through industrial solid waste-based nano-reinforced ion exchange, which comprises the following steps: S1, crushing secondary aluminum ash, coal gangue and rare earth tailings to 0.1-1 mu m, and uniformly mixing to obtain main powder; s2, adding nano silicon dioxide and nano aluminum oxide into the main powder, and uniformly mixing to obtain a blank; the mass ratio of the nanometer aluminum oxide to the main body powder is (1-3): 100S3, granulating and sintering the blank to obtain coarse ceramsite; and S4, depositing a carbon composite coating on the surface of the coarse ceramsite to obtain the ceramsite proppant. According to the preparation method for preparing the ceramsite proppant through industrial solid waste-based nano-reinforced ion exchange, the production cost of the ceramsite proppant can be reduced.

Description

Technical Field

[0001] This invention relates to the field of oil and gas extraction, and more specifically, to a method for preparing ceramsite proppant based on industrial solid waste-based nano-reinforced ion exchange. Background Technology

[0002] Industrial solid waste refers to solid waste generated during industrial production activities, including waste residue, dust, sludge, and tailings discharged during the production processes of numerous industries such as mining, metallurgy, chemicals, power, and building materials. Improper treatment of these wastes can cause serious pollution to soil, water sources, and air, and may even endanger human health. However, with proper utilization, they can become recyclable resources. Secondary aluminum ash and coal gangue are common industrial solid wastes that easily pollute soil and create enormous environmental pressure. Using pretreated secondary aluminum ash and coal gangue as raw materials to prepare ceramsite proppant can not only alleviate the environmental problems caused by industrial solid waste but also reduce the production cost of ceramsite proppant.

[0003] In order to solve the above problems, people have been seeking an ideal technological solution. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a method for preparing ceramsite proppant based on industrial solid waste-based nano-reinforced ion exchange.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for preparing a nano-reinforced ion exchange proppant based on industrial solid waste includes the following steps: S1. Secondary aluminum ash, coal gangue, and rare earth tailings are crushed to 0.1-1μm and mixed evenly in a mass ratio of (4-5):(3-4):(1-2) to obtain the main powder. S2. Nano-silica and nano-alumina are added to the main powder and mixed evenly to obtain a blank; the particle size of the nano-reinforcing material is 50-100 nm, and the mass ratio of nano-silica to the main powder is (1-3):100; the mass ratio of nano-alumina to the main powder is (1-3):100. S3. The raw material is granulated and sintered to obtain coarse ceramic particles; S4. A carbon composite coating is deposited on the surface of coarse ceramic particles to obtain a ceramic particle proppant.

[0006] By mass percentage, the composition of secondary aluminum ash includes: silicon dioxide 5.5%-6.0%, aluminum oxide 68%-72%, iron oxide 0.5%-1.0%, calcium oxide 2.0%-2.5%, magnesium oxide 2.5%-2.8%, potassium oxide <0.5%, sodium oxide <0.5%, and titanium oxide 0.5%-1.0%.

[0007] The composition of coal gangue includes: 50%-52% silicon dioxide, 44%-46% aluminum oxide, 0.5%-1.0% iron oxide, <0.1% calcium oxide, <0.1% magnesium oxide, <0.5% potassium oxide, <0.5% sodium oxide, and 0.5%-1.1% titanium oxide.

[0008] The radioactivity of rare earth tailings is <2000 Bq / kg. By mass percentage, the composition of rare earth tailings includes: 0.5%-5% rare earth oxides, 40%-60% silicon dioxide, 15%-30% aluminum oxide, 5%-15% magnesium oxide, and 3%-8% calcium oxide.

[0009] Specifically, secondary aluminum ash, coal gangue, and rare earth tailings can be purchased as pre-processed products, or they can be pre-treated using existing equipment. This involves processes such as impurity removal, crushing, washing, and neutralization, followed by separation using magnetic separation and flotation equipment to remove fluorides and iron oxides, and reduce the radioactivity of the rare earth tailings. There are no restrictions on the treatment methods for secondary aluminum ash, coal gangue, and rare earth tailings, as long as the compositional requirements of these materials are met. In the sintering process, the sintering is first carried out at a low temperature of 600-700℃ for 1-3 hours, then at 1000-1300℃ for 2-4 hours, and then at 1300-1400℃ for 1-3 hours.

[0010] The main powder, nano-silica, and nano-alumina are stirred at 1000-3000 r / min for 10-30 min.

[0011] The raw material is granulated to obtain coarse particles of 50-70 mesh. The coarse particles are then subjected to sintering, cooling, and sieving processes to obtain coarse ceramic particles of 20-40 mesh.

[0012] Place the coarse ceramic particles in the reactor and evacuate to 10°C. -3 Pa, heat to 800-1200℃, introduce carbon-containing gas, and deposit for 1-4 h to obtain 20-40 mesh ceramic proppant.

[0013] The carbon-containing gases are methane, acetylene, and propane.

[0014] This invention has significant substantive features and remarkable progress compared to existing technologies. Specifically, this invention provides a method for preparing ceramsite proppant based on industrial solid waste nano-reinforced ion exchange, using secondary aluminum ash, coal gangue, and rare earth tailings powder as main materials to reduce raw material costs; employing a three-stage sintering process to improve crystal phase transformation efficiency; simultaneously, rare earth oxides in the rare earth tailings undergo ion migration and solid solution during sintering, effectively enhancing the strength of the ceramsite; after sintering, a carbon coating is deposited on the surface of the ceramsite to improve surface lubricity and reduce acid solubility. Detailed Implementation

[0015] The technical solution of the present invention will be further described in detail below through specific embodiments. In the following embodiments, secondary aluminum ash, coal gangue, and rare earth tailings can be directly purchased as processed commercial products.

[0016] The composition of secondary aluminum ash, by mass percentage, includes: 5.92% silicon dioxide, 68.61% aluminum oxide, 0.98% iron oxide, 2.20% calcium oxide, 2.61% magnesium oxide, 0.32% potassium oxide, 0.37% sodium oxide, and 0.65% titanium oxide, with the balance being loss on ignition. The composition of coal gangue includes: 50.97% silicon dioxide, 45.02% aluminum oxide, 0.60% iron oxide, 0.06% calcium oxide, 0.07% magnesium oxide, 0.03% potassium oxide, 0.03% sodium oxide, and 1.05% titanium oxide, with the balance being loss on ignition. After pretreatment, the radioactivity specific activity is <2000 Bq / kg. The composition of rare earth tailings by mass percentage includes: rare earth oxides 4.55%, silicon dioxide 45.36%, aluminum oxide 28.48%, magnesium oxide 12.11%, calcium oxide 5.36%, with the balance being loss on ignition; among which, La2O3 is 0.90% and CeO2 is 3.25%. Example 1

[0017] Example: A method for preparing ceramsite proppant based on industrial solid waste nano-reinforced ion exchange, comprising the following steps: S1. Secondary aluminum ash, coal gangue, and rare earth tailings are pulverized to 0.1-1μm and mixed evenly in a mass ratio of 5:4:1 to obtain the main powder. S2. Nano-silica and nano-alumina are added to the main powder and stirred at 2000-3000 r / min for 15 min to mix evenly, thus obtaining a billet; the particle size of the nano-reinforcing material is 50-100 nm, the mass ratio of nano-silica to the main powder is 1.5:100, the mass ratio of nano-alumina to the main powder is 2:100, the average particle size of nano-silica is 70 nm, and the average particle size of nano-alumina is 50 nm; S3. Granulate the raw material to obtain 50-70 mesh coarse particles. The coarse particles are first sintered at a low temperature of 600-700℃ for 2 hours, then sintered at 1000-1100℃ for 3 hours, and then sintered at 1300-1400℃ for 2 hours. After cooling and screening, 20-40 mesh coarse ceramic particles are obtained. S4. Place the coarse ceramic particles in the reactor and evacuate to 10°C. -3 Pa, heat to 900-1000℃, introduce carbon-containing gas at a rate of 80 ml / min for methane and 300 ml / min for argon, and deposit for 3 h to obtain 20-40 mesh ceramic proppant. Example 2

[0018] This embodiment discloses a method for preparing a nano-reinforced ion exchange proppant based on industrial solid waste, which includes the following steps: S1. Secondary aluminum ash, coal gangue, and rare earth tailings are crushed to 0.1-1μm and mixed evenly in a mass ratio of 4:4:2 to obtain the main powder. S2. Nano-silica and nano-alumina are added to the main powder and stirred at 1000-2000 r / min for 30 min to mix evenly, thus obtaining a billet; the particle size of the nano-reinforcing material is 50-100 nm, the mass ratio of nano-silica to the main powder is 2:100, the mass ratio of nano-alumina to the main powder is 2:100, the average particle size of nano-silica is 70 nm, and the average particle size of nano-alumina is 55 nm; S3. Granulate the raw material to obtain 50-70 mesh coarse particles. The coarse particles are first sintered at a low temperature of 600-700℃ for 3 hours, then sintered at 1100-1200℃ for 2 hours, and then sintered at 1300-1400℃ for 3 hours. After cooling and screening, 20-40 mesh coarse ceramic particles are obtained. S4. Place the coarse ceramic particles in the reactor and evacuate to 10°C. -3 Pa, heat to 900-1000℃, and introduce carbon-containing gas at a rate of 50 ml / min propane and 300 ml / min argon, and deposit for 2 h to obtain 20-40 mesh ceramic proppant. Example 3

[0019] This embodiment discloses a method for preparing a nano-reinforced ion exchange proppant based on industrial solid waste, which includes the following steps: S1. Secondary aluminum ash, coal gangue, and rare earth tailings are crushed to 0.1-1μm and mixed evenly in a mass ratio of 5:3:2 to obtain the main powder. S2. Nano-silica and nano-alumina are added to the main powder and stirred at 1000-2000 r / min for 20 min to mix evenly, thus obtaining a billet; the particle size of the nano-reinforcing material is 50-100 nm, the mass ratio of nano-silica to the main powder is 1:100, the mass ratio of nano-alumina to the main powder is 3:100, the average particle size of nano-silica is 75 nm, and the average particle size of nano-alumina is 50 nm; S3. Granulate the raw material to obtain 50-70 mesh coarse particles. The coarse particles are first sintered at a low temperature of 600-700℃ for 1 h, then sintered at 1200-1300℃ for 2 h, and then sintered at 1300-1400℃ for 1 h. After cooling and screening, 20-40 mesh coarse ceramic particles are obtained. S4. Place the coarse ceramic particles in the reactor and evacuate to 10°C. -3 Pa, heat to 800-900℃, and introduce carbon-containing gas at 40 ml / min acetylene and 300 ml / min argon, and deposit for 1 h to obtain 20-40 mesh ceramic proppant. Example 4

[0020] This embodiment discloses a method for preparing a nano-reinforced ion exchange proppant based on industrial solid waste, which includes the following steps: S1. Secondary aluminum ash, coal gangue, and rare earth tailings are pulverized to 0.1-1μm and mixed evenly in a mass ratio of 5:4:1 to obtain the main powder. S2. Nano-silica and nano-alumina are added to the main powder and stirred at 2000-3000 r / min for 10 min to mix evenly, thus obtaining a billet; the particle size of the nano-reinforcing material is 50-100 nm, the mass ratio of nano-silica to the main powder is 1:100, the mass ratio of nano-alumina to the main powder is 3:100, the average particle size of nano-silica is 70 nm, and the average particle size of nano-alumina is 58 nm; S3. Granulate the raw material to obtain 50-70 mesh coarse particles. The coarse particles are first sintered at a low temperature of 600-700℃ for 2 hours, then sintered at 1000-1100℃ for 2 hours, and then sintered at 1300-1400℃ for 2 hours. After cooling and screening, 20-40 mesh coarse ceramic particles are obtained. S4. Place the coarse ceramic particles in the reactor and evacuate to 10°C. -3 Pa, heat to 900-1000℃, introduce carbon-containing gas at a rate of 40 ml / min propane and 300 ml / min argon, and deposit for 3 h to obtain 20-40 mesh ceramic proppant.

[0021] Performance testing The performance of the ceramsite proppant prepared in Examples 1-3 was tested according to SY / T5108-2006, and the test results are shown in Table 1.

[0022]

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for preparing a nano-reinforced ion exchange proppant based on industrial solid waste, comprising the following steps: S1. Secondary aluminum ash, coal gangue, and rare earth tailings are crushed to 0.1-1μm and mixed evenly in a mass ratio of (4-5):(3-4):(1-2) to obtain the main powder. S2. Nano-silica and nano-alumina are added to the main powder and mixed evenly to obtain a blank; the particle size of the nano-reinforcing material is 50-100 nm, and the mass ratio of nano-silica to the main powder is (1-3):100; the mass ratio of nano-alumina to the main powder is (1-3):

100. S3. The raw material is granulated and sintered to obtain coarse ceramic particles; S4. A carbon composite coating is deposited on the surface of coarse ceramic particles to obtain a ceramic particle proppant.

2. The method for preparing ceramsite proppant based on industrial solid waste nano-reinforced ion exchange according to claim 1, characterized in that, By mass percentage, the composition of secondary aluminum ash includes: silicon dioxide 5.5%-6.0%, aluminum oxide 68%-72%, iron oxide 0.5%-1.0%, calcium oxide 2.0%-2.5%, magnesium oxide 2.5%-2.8%, potassium oxide <0.5%, sodium oxide <0.5%, and titanium oxide 0.5%-1.0%.

3. The method for preparing ceramsite proppant based on industrial solid waste nano-reinforced ion exchange according to claim 1, characterized in that, The composition of coal gangue includes: 50%-52% silicon dioxide, 44%-46% aluminum oxide, 0.5%-1.0% iron oxide, <0.1% calcium oxide, <0.1% magnesium oxide, <0.5% potassium oxide, <0.5% sodium oxide, and 0.5%-1.1% titanium oxide.

4. The method for preparing ceramsite proppant based on industrial solid waste nano-reinforced ion exchange according to claim 1, characterized in that: The radioactivity of rare earth tailings is <2000 Bq / kg. By mass percentage, the composition of rare earth tailings includes: 0.5%-5% rare earth oxides, 40%-60% silicon dioxide, 15%-30% aluminum oxide, 5%-15% magnesium oxide, and 3%-8% calcium oxide.

5. The method for preparing ceramsite proppant based on industrial solid waste nano-reinforced ion exchange according to claim 1, characterized in that: In the sintering process, the sintering is first carried out at a low temperature of 600-700℃ for 1-3 hours, then at 1000-1300℃ for 2-4 hours, and finally at 1300-1400℃ for 1-3 hours.

6. The method for preparing ceramsite proppant based on industrial solid waste nano-reinforced ion exchange according to claim 1, characterized in that: The main powder, nano-silica, and nano-alumina are stirred at 1000-3000 r / min for 10-30 min.

7. The method for preparing ceramsite proppant based on industrial solid waste nano-reinforced ion exchange according to claim 1, characterized in that: The raw material is granulated to obtain coarse particles of 50-70 mesh. The coarse particles are then subjected to sintering, cooling, and sieving processes to obtain coarse ceramic particles of 20-40 mesh.

8. The method for preparing ceramsite proppant based on industrial solid waste nano-reinforced ion exchange according to claim 1, characterized in that: Place the coarse ceramic particles in the reactor and evacuate to 10°C. -3 Pa, heat to 800-1200℃, introduce carbon-containing gas, and deposit for 1-4 h to obtain 20-40 mesh ceramic proppant.

9. The method for preparing ceramsite proppant based on industrial solid waste nano-reinforced ion exchange according to claim 8, characterized in that: The carbon-containing gases are methane, acetylene, and propane.

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