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Pasta y polvo de aluminio para hormigón celular

Categoría Pasta de aluminio Five Star

Aluminium Paste & Powder (APP) is a key aerating agent for producing lightweight aerated concrete. It reacts with alkaline substances to release hydrogen, creating a porous structure that enhances thermal insulation, soundproofing, and construction flexibility. Ideal for reducing building weight and improving earthquake resistance.

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Aluminium Paste & Powder for AAC

Aluminium Paste & Powder (APP) is a crucial aerating agent in producing AAC blocks. It reacts with alkaline substances to release hydrogen gas, forming a lightweight, porous structure. Below are the key aspects:

1. Function & Reaction Mechanism

1.1 Aeration Principle

In an alkaline environment (e.g., Ca(OH)₂), Aluminium Paste & Powder reacts with water to produce hydrogen gas:

2Al+3Ca(OH)2+6h2O→3CaO⋅Al2O3⋅6h2O+3h2↑

This reaction creates uniformly distributed pores within the slurry, reducing the final product density to 500-700 kg/m³—only one-fifth of conventional concrete.

1.2 Pore Structure Impact

The size and distribution of pores directly determine AAC’s insulation and soundproofing properties. To achieve an ideal pore structure, the aluminum particles must have a suitable fineness (≤3% residue on a 0.075mm sieve) and a high active aluminum content (≥85%).

2. Production Process & Technical Requirements

The production process of aerated aluminum paste (slurry)/powder is crucial in determining the final product’s quality and performance. This chapter will detail the production flow, key technologies, and control points of each stage in the manufacturing process of aerated aluminum paste (slurry)/powder to help readers better understand the manufacturing of this critical material.

2.1 Production Flow

The production flow of aerated aluminum paste (slurry)/powder typically includes the following main steps:

2.1.1 Raw Material Preparation

Before production begins, the selection and Preparation of raw materials are crucial. The main raw materials include aluminum powder, additives (such as DEG, dispersants, etc.), and other ingredients. The selection of aluminum powder is usually based on its particle size, activity, and purity. Highly active aluminum powder can generate more hydrogen gas when reacting with water, thus achieving better gas generation effects. The selection of additives needs to consider their role in the aerated aluminum paste, such as improving fluidity and enhancing reactivity.

2.1.2 Mixing

The prepared aluminum powder and additives are mixed in a certain proportion. This step usually uses high-efficiency mixing equipment to ensure uniform component distribution and avoid agglomeration. The mixing time and speed must be strictly controlled during the mixing process to ensure a sufficient combination of aluminum powder and additives, laying a good foundation for subsequent reactions.

2.1.3 Grinding and Classification

The mixed materials need to be ground to reach the specified particle size. This step is crucial for improving the activity of the aluminum powder. Using ball mills or other types of grinding equipment can effectively reduce the particle size and increase the surface area of the aluminum powder, thereby enhancing its reactivity with water. After grinding, the materials must also be classified to ensure particle size and product distribution consistency.

2.1.4 Paste Preparation

In this step, the ground aluminum powder is mixed with water and other necessary additives to form the aluminum paste. The reaction conditions at this time (such as temperature and stirring speed) need to be controlled to ensure that the reaction between aluminum powder and water is sufficient to generate a stable bubble structure. Better gas generation effect and fluidity can be obtained through reasonable proportioning and stirring.

2.1.5 Storage and Packaging

The prepared aerated aluminum paste (slurry) must pay attention to environmental conditions during storage and transportation, avoiding high temperatures and humidity to prevent premature reaction and failure. Its physical and chemical properties should be checked regularly during storage to ensure stable product quality. Finally, the aluminum paste must be packaged according to standards to ensure no leakage or deterioration occurs during transportation.

2.2 Key Technologies

In the production process of aerated aluminum paste (slurry)/powder, several key technologies have a profound impact on the performance and quality of the final product:

2.2.1 Ball Milling Technology

Ball milling is an important technology for grinding aluminum powder. The physical grinding process can effectively reduce the particle size of the aluminum powder and increase its specific surface area. Smaller particle sizes help enhance the reactivity of the aluminum powder, allowing it to generate hydrogen gas more rapidly when reacting with water, thereby forming a uniform and stable bubble structure.

2.2.2 Classification Technology

Classification technology plays an important role in ensuring the consistency of the particle size distribution of aluminum powder. Through classification, aluminum powders of different particle sizes can be separated, improving the activity and adaptability of the material. A suitable particle size distribution can optimize bubble formation and enhance aerated concrete’s strength and thermal insulation performance.

2.2.3 Reaction Control Technology

In the preparation process of aluminum paste, controlling reaction conditions (such as temperature and time) is crucial. Reasonable reaction conditions can ensure that the reaction between aluminum powder and water is sufficient to generate an adequate number of evenly distributed bubbles. The application of reaction control technology helps to improve the stability and consistency of the product.

2.2.4 Formulation Optimization Technology

Product performance can be improved by continuously optimizing the formulation of aluminum paste (slurry). For example, adding appropriate amounts of certain additives can increase the aluminum powder’s reaction rate and improve the aluminum paste’s fluidity and stability. In addition, for different application needs, enterprises can develop various types of aluminum paste to meet the market’s diverse needs.

2.2.5 Environmental Control Technology

In production, controlling environmental conditions (such as temperature and humidity) is also crucial to ensure product quality. Especially in the storage and transportation stages, it is necessary to provide suitable environmental conditions to prevent the aluminum paste from failing or deteriorating due to environmental changes.

2.3 Quality Control

Quality control is an important link throughout the production process to ensure the stable performance of aerated aluminum paste (slurry)/powder. Enterprises usually establish a complete quality management system, including:

2.3.1 Raw Material Inspection

Before production begins, all raw materials must undergo strict quality inspection to ensure they meet production standards. The aluminum powder’s activity, purity, and particle size distribution need to be tested to determine whether it meets the production requirements.

2.3.2 Process Monitoring

During the production process, the parameters of each stage (such as temperature, humidity, mixing time, etc.) are monitored in real-time to ensure that the production process is always in the best state. In addition, online testing equipment can detect and adjust problems in time to prevent the generation of unqualified products.

2.3.3 Finished Product Inspection

After the product is produced, comprehensive performance testing of the finished product is required, including indicators such as fluidity, gas generation, and compressive strength, to ensure that it meets relevant standards and customer needs. Only products that have passed strict testing can be put on the market for sale.

3. Application Advantages & Market Trends

3.1 Comparison Between Aluminum Paste and Traditional Dry Aluminum Powder

Characteristic	Aluminum Paste (Water-based)	Dry Aluminum Powder
Proceso de producción	Wet grinding, no need for degreasing	Dry grinding, requires degreasing
Seguridad	No dust explosion risk	Flammable and explosive, requires nitrogen protection
Facilidad de uso	Directly added to slurry, good dispersion	Requires pre-degreasing treatment
Environmental Impact	Low pollution, easy wastewater treatment	High energy consumption, more pollution

3.2 Performance Advantages

Lightweight & High Strength: Reduces building weight by over 40%, enhancing earthquake resistance.
Thermal Insulation: Thermal conductivity ranges from 0.11 to 0.16 W/m·K, outperforming traditional brick walls.
Ease of Construction: The material can ser cortado and drilled, allowing for flexible applications in complex structures.

3.3 Market Trends

Price Fluctuations: Aluminium prices and energy costs influence market pricing, which will average around ¥10,000 per ton in 2024.
Regional Supply & Demand: Major production areas include Anhui, Shandong, and Jiangsu, while demand in the southwest region is growing significantly.

4. Quality Control & Testing Methods

Below are key testing methods and technical requirements based on industry standards and practical applications:

4.1 Key Physical Property Tests

4.1.1 Active Aluminium Content Measurement

Principle: Hydrogen gas volume from the reaction between Aluminium Paste & Powder and an alkaline solution determines the active aluminum content (theoretical aeration capacity: 1.24 L/g).
Method: Operators follow JC/T407 standards using a gas evolution apparatus (featuring reaction bottles, gas volume tubes, and thermostatic baths). The hydrogen gas volume is recorded and adjusted based on temperature and pressure to calculate active aluminum content.
Standard: Oil-based aluminum paste must have an active aluminum content of ≥90%, while water-based aluminum paste must be ≥85%.

4.1.2 Fineness Testing

Sieving Method: Dried aluminum powder is sieved using a 0.075mm copper mesh (wet sieving with a dispersing agent), with a residue requirement of ≤3%.
Laser Particle Analysis: Used to verify uniform particle distribution and optimize milling processes.

4.1.3 Solid Content Measurement

Procedure: Weigh aluminum paste samples, dry at 105°C until constant weight, and calculate solid content. (Oil-based ≥75%, water-based ≥65%).

4.2 Chemical Performance Tests

4.2.1 Gas Evolution Characteristics

Gas Evolution Curve Test: Conducted at 45°C, where Aluminium Paste & Powder reacts with a cement-sodium hydroxide mixture. The gas evolution curve ensures synchrony between aeration and slurry thickening, preventing collapse or trapped gas.
Standard: Oil-based aluminum paste should achieve ≥50% gas evolution in 4 minutes, ≥80% in 16 minutes, and ≥90% in 30 minutes.

4.2.2 Hydrogen Evolution Test (for Passivated Aluminium Powder)

pH Monitoring Method: Aluminium powder is dispersed in water and heated to 60°C while monitoring pH changes. A drop to 4.19-4.23 within 35 minutes indicates excessive hydrogen evolution (failure), while a stable pH of 6-7 confirms passivation integrity.

4.2.3 Oxidation Degree Testing

Oxygen-Nitrogen Analyzer Method: Pre-treated Aluminium Paste & Powder are heated in a dual-layer graphite crucible (4.5kW), measuring released oxygen to evaluate oxide layer thickness and sintering quality.

4.3 Safety & Environmental Standards

4.3.1 Explosion Prevention

Dust Concentration Control: Maintain aluminum powder concentration below 10g/m³ to mitigate explosion risks.
Electrostatic Protection: Wet-process aluminum paste is preferred over dry powder to reduce dust explosion hazards.

4.3.2 Environmental Compliance

Wastewater Treatment: Monitor heavy metal content (e.g., aluminum ions) in wet milling effluents to ensure regulatory compliance.

4.4 Equipment & Standards Reference

Key Equipment: Laser particle analyzers, gas evolution measurement devices, oxygen-nitrogen analyzers, thermal gravimetric analyzers, precision pH meters.
- Applicable Standards: JC/T407-2008: Aluminium paste technical specifications (active aluminum content, fineness, aeration rate).
- GB/T11968-2023: Testing methods for autoclaved aerated concrete blocks.

4.5 Important Considerations

Sample Pre-Treatment: Before testing, remove oil contamination from aluminum powder via ultrasonic cleaning with petroleum ether, followed by drying.
Process Adaptation: Adjust the dosage of Aluminium Paste and powder based on slurry temperature and calcium-to-silicon ratio (0.55-0.80) to synchronize aeration with thickening.

5. Impact of Gas Evolution Characteristics on AAC

5.1 Aeration Speed & Production Process Synchronization

5.1.1 Matching Aeration & Thickening

Aluminium Paste & Powder must aerate at a rate that aligns with slurry thickening:

Too Fast (e.g., >20ml in 2 minutes): Excessive gas release before slurry setting causes pore merging, collapse, or sedimentation.
Too Slow (e.g., <6ml in 2 minutes): Residual aluminum powder continues reacting after the slurry sets, leading to trapped gas, cracks, or uneven expansion.
Ideal Range: Data suggests optimal stability at 6-15ml in 2 minutes, 40-60ml in 8 minutes, and 70-90ml in 16 minutes.

5.1.2 Temperature Sensitivity

Maintain slurry temperature at 40-60°C. Excessive heat accelerates aeration, risking uncontrolled expansion, while low temperatures slow aeration, leading to uneven pore distribution.

5.2 Gas Evolution & Pore Structure

Pore Uniformity: High active aluminum content (≥85%) and fine particle size (≤3% residue on a 0.075mm sieve) ensure even aeration. Low activity or oversized particles create large, interconnected pores, reducing compressive strength by 15-30%.
- Density & Functional Properties: Theoretical Gas Evolution: 1g of aluminum produces 1.24L hydrogen. Practical aeration should reach at least 90% of the theoretical value to ensure a 500-700 kg/m³ density.
- Thermal & Acoustic Performance: When pore size ranges from 0.2-2mm and porosity is 70-85%, thermal conductivity drops to 0.11-0.16W/m·K, outperforming conventional brick walls by 4-5 times.

6. Optimization Strategies for Aeration Performance

6.1 Raw Material Selection

Prefer Water-Based Aluminium Paste (GLS-65): It offers better dispersion and minimizes dust explosion risks.
Active Aluminium Content Testing: For accurate results, utilize JC/T407 gas evolution measurement devices with temperature compensation.

6.2 Process Adjustments

Calcium-Silicon Ratio (0.55-0.80): Excessive alkalinity (high Ca(OH)₂ content) inhibits aluminum reactions.
Foam Stabilizers (e.g., Soluble Oil): Extend bubble stability by 30-50%, reducing collapse risks.

Fiver Star New Materials ensures optimal concrete quality, enhancing thermal efficiency, mechanical strength, and construction adaptability by fine-tuning aeration parameters.

Specification of Aluminium Paste & Powder for AAC

Product Name	Solid Content (%)	Active Alumina (%)	Bulk Density	Median Particle Size (D₅₀)	Suitable for AAC
DEG-60	70%	≥96	0.15	58–62	<600
DEG-40	70%	≥94	0.15	36–42	<500
DEG-35	70%	≥94	0.15	33–35	<400
DEG-25	70%	≥94	0.15	25–27	<400
DEG-18	70%	≥92	0.11	17–19	<350

Estimated Cost of Aluminium Paste & Powder for AAC

Le sugerimos que se comunique con nosotros plenamente antes de comprar, sin duda consideraremos todos los aspectos y le ofreceremos un plan de precios justo y razonable. Al elegirnos, obtendrá el mejor producto y la mejor relación calidad-precio.

Elegir la especificación adecuada

Elegir el tamaño adecuado del producto le ofrece la mejor relación calidad-precio. Nuestra pasta de plata de aluminio Metal Flash está disponible en una amplia gama de tamaños de partícula y purezas, con precios que varían según la especificación. Comunicando detalladamente sus necesidades y eligiendo el tamaño adecuado, puede obtener la mejor relación calidad-precio.

Cantidad de compras

Cuanto mayor sea la cantidad comprada, menor será el precio unitario. Los pedidos al por mayor nos permiten compartir mejor nuestros costes de producción y funcionamiento, por lo que nos complace ofrecer precios con descuento por compras al por mayor.

Condiciones de pago

El momento y la forma de pago que elija también afectarán al precio. Por ejemplo, pagar todo por adelantado puede resultar en un precio más favorable, ya que reduce nuestro coste de capital. Consulte con nuestro equipo de ventas la opción de pago que más le convenga.

Transporte

El transporte y la logística también son factores que afectan al coste total de propiedad. Los costes de envío varían según el modo de transporte y el destino. También hay que tener en cuenta los aranceles, los seguros y otros gastos. Si calcula estos factores antes de la compra, podrá estimar con más precisión el coste total.

Manufacturing Craft of Aluminium Paste & Powder for AAC

At Five Star Materials, our Aluminium Paste & Powder for AAC produced in a delicate and rigorous process. Below is our basic production process:

Preparación de la materia prima

Compramos materias primas de gran pureza a proveedores de confianza para garantizar la calidad de nuestros productos desde el origen.

Trituración

La materia prima se tritura para convertir los bloques de aluminio en partículas diminutas para su posterior procesamiento.

Proceso de mezcla

El polvo de aluminio triturado se mezcla con nuestros disolventes y aditivos especialmente formulados y, a continuación, se mezcla mediante un proceso de mezclado a alta velocidad. Este paso es muy importante, ya que determina la estabilidad de la pasta de aluminio y la forma de las partículas.

Filtración y pruebas

Tras la molienda, la pasta de aluminio pasa por un sistema de filtración para eliminar posibles impurezas. A continuación, nuestro equipo de control de calidad realizará una serie de pruebas sobre el producto, como el tamaño de las partículas, el brillo, el tacto metálico, etc., para confirmar que el producto cumple nuestros elevados estándares de calidad.

Embalaje y almacenamiento

Los productos que han superado rigurosas pruebas se envasan cuidadosamente y se almacenan en nuestros almacenes, listos para su envío a nuestros clientes.

Tenga en cuenta que este es un proceso de producción básico y que el proceso exacto puede variar en función de los requisitos específicos del producto. En Five Star Materials nos tomamos muy en serio el control de calidad y nos aseguramos de que nuestros productos cumplan nuestras estrictas normas de calidad en cada paso del proceso de producción.

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