What is Aluminium slag?

Aluminum Slag – During the processing of aluminium, a solid waste called aluminium slag is produced, which contains a high amount of aluminium and thus has significant recycling value. However, due to the fact that aluminium slag reacts with water to produce ammonia gas, it has reactive hazardous characteristics. As of January 1, 2021, the “List of Hazardous Wastes” (2021 Edition) clearly defines aluminium dross as a hazardous waste. So, what exactly is aluminium dross and how should it be handled?

Aluminum slag is the scum and slag that floats on the surface of molten aluminum during the electrolytic aluminum, casting aluminum, and recycled aluminum smelting processes, including the remaining residue after subsequent treatments such as roasting and ball milling.

The basic process flow for recovering metallic aluminum from commonly used aluminum dross is: crushing – grinding milling – screening.

1. Crushing: The recycled aluminum dross and foundry waste molding sand are conveyed through the silo by a closed conveyor to the ball mill for grinding.

2. Special for Aluminum slag grinding milling raymond mill: Further ball milling is carried out on the aluminum ash residue that has undergone the crushing step.
3. Screening: Generally, a drum screen is used. The screening drum rotates at a certain speed, and the material passes through the screening drum from top to bottom to be separated. Fine materials are discharged from the lower front end of the screening drum, while coarse materials are discharged from the lower tail end of the screening drum. It has a simple structure, large processing capacity, and is suitable for both dry and wet materials. The drum screen can effectively screen out metal aluminum particles of different particle sizes, and the screened aluminum is relatively clean. After screening, the materials are divided into aluminum chips/particles and powder (secondary aluminum ash). The aluminum chips/particles can be sold to aluminum processing enterprises for remelting, and the remaining powder mainly contains alumina and can be sent to cement plants as auxiliary materials.

The process flow of aluminium dross treatment should ensure that the entire recycling process is safe and dust-free, and does not cause secondary pollution to the environment.

At present, the special aluminum ash grinding mill produced by Cronus Company is being installed intensively in Zhengzhou, Henan Province. It is learned that this grinding mill has been upgraded based on the Raymond mill in accordance with the characteristics of aluminum ash. It adopts super wear-resistant high-strength materials and can process aluminum ash to 400 mesh. The designed output is 8 tons per hour. After comparison, the average service life of this Raymond mill in processing aluminum ash has been increased by 2 times compared with the traditional grinding mill. Currently, our company’s Raymond mill equipment has been widely applied in the aluminum ash industry, and its market share in this field exceeds 50%.

Aluminum slag, when exposed to water, will undergo a reaction and release ammonia gas. It is also prone to spontaneous combustion when damp. Therefore, when enterprises handle aluminum slag, they need to follow the relevant requirements for managing hazardous waste. They should report and register the generated hazardous waste, such as aluminum slag, and properly dispose of it to ensure environmental safety.

1. Establish storage facilities following regulations, set up identification signs, implement protective measures, conduct classified collection and storage, and ensure that the management records are complete.

II. The requirements for the full life-cycle monitoring system of hazardous waste should be implemented. Management ledgers should be established to enable traceability and queryability of hazardous waste.

III. Dispose of hazardous waste by the law to qualified waste disposal units. Verify the legal person qualifications and technical capabilities of the entrusted party, and stipulate corresponding pollution prevention requirements in the contract.

Special Raymond mill for Aluminum slag

Processing material: Aluminum slag

Located: Zhengzhou, Henan

Fineness:325 mesh D95

Capacity:8 TPH

Available services: Test run and On-site visit

Introduction to the Market of Nanyang Calcium Carbonate Powder

Nanyang City, Henan Province, stands as a pivotal hub for calcium carbonate (CaCO3) production in central China, with a robust industrial ecosystem supported by abundant mineral resources and strategic investments. Here’s a comprehensive analysis tailored to your requirements:

 Calcium Carbonate Mines & Resources in Nanyang

Nanyang, particularly Nanzhao County, is renowned as the “Calcium Capital of China”  The Key highlights include:

• Reserves: Total CaCO3 reserves exceed 1 billion tons, with 800 million tons recoverable. Notably, Nanzhao holds 50 million tons of high-purity calcite suitable for food-grade applications.
• Geographic Concentration: Mines cluster in Nanzhao’s Nanhegou Town and Changling Industrial Park, where upstream mining enterprises supply raw materials to 242 midstream powder processors.
• Emerging Areas: Xixia County, through a partnership with global giant Omya, is developing a 3 million tons/year CaCO3 base leveraging its high-white (≥92%) and high-purity deposits .

This client is a major calcium carbonate powder producer in the Nanyang area. Currently, it mainly produces high fineness, high whiteness and high purity premium calcium carbonate micropowder. The main machines it uses are ultrafine ring roller mill and ultrafine vertical mill. The third-phase project is currently in preparation. After completion, it is expected that the total equipment production capacity will reach 300,000 tons per year.

Production Capacity of Nanyang: Midstream enterprises produce 650,000 tons/year of CaCO3 powders, with ultra-fine grades (800–3,000 mesh) accounting for 30% of output.

Applications & Market Dynamics

CaCO3 from Nanyang serves 9 major industries, with coatings and plastics as primary drivers:

• Coatings (40% of demand): Global players like Nippon Paint and Skshu Paint operate production bases in Nanzhao, using 1,250–3,000 mesh CaCO3 for waterborne paints and architectural coatings.
• Plastics (30%): CaCO3 fillers enhance rigidity in PVC pipes (produced by Yushu Pipe Industry) and automotive composites, with 600–1,250 mesh grades dominating this segment.
• Emerging Sectors:
  • New Energy: CaCO3 is used in battery separators and photovoltaic encapsulants, aligning with China’s green energy goals.
  • Food & Pharmaceuticals: Nanzhao’s calcite reserves support GMP-certified production for dietary supplements and antacids.

Nanyang’s CaCO3 industry is positioned for sustained expansion, driven by:

• Policy Support: The Nanyang CaCO3 Industrial Chain Plan aims to achieve ¥10 billion annual output by 2030 through investments in R&D and green technologies.
• Environmental Integration:
  • Circular Economy: Nanzhao’s Resource Recycling Industrial Park recycles 95% of mining waste into aggregates and construction materials.
  • Emission Standards: Stringent regulations (e.g., PM ≤10mg/m³) push adoption of baghouse filters and closed-loop systems.
• Technological Upgrades:
  • Smart Manufacturing: Xintai Calcium’s provincial-level intelligent workshop reduces energy consumption by 20%.
  • Functional Products: R&D focuses on nano-CaCO3 for self-healing coatings and biodegradable plastics, targeting premium markets.
• Export Potential: With proximity to the China-Europe Railway, Nanyang is eyeing exports to Southeast Asia and Europe, particularly for ultra-fine and activated grades.

• Resource Depletion: High-grade reserves may decline by 2035, necessitating investments in low-grade ore beneficiation.
• Competition: Southern China’s Guangxi Province dominates precipitated CaCO3, but Nanyang’s natural whiteness (≥92%) and cost efficiency (¥800–1,200/ton) remain competitive.
• Talent Shortage: Collaboration with Zhengzhou University and vocational schools is fostering expertise in mineral engineering and nanomaterials.

For the production of calcium carbonate powder grinding, we have launched the following machines:

The calcium carbonate grinding equipment of our company mainly includes Raymond mill, ultrafine ring roller mill and ultrafine vertical mill, etc. You can choose the appropriate model according to different fineness and product quality requirements. Besides, our company is equipped with professional technicians who can conduct a comprehensive analysis on your ore grade and market prospects, and match the suitable processing equipment based on your customer group positioning.

if you are interested in this processing plant , you can contact us by the fellow:

Recommendation for Equipment for Producing Calcium Oxide into Calcium Hydroxide

• Processing material: Limestone
• Finished product: high purity and fine calcium hydroxide powder
• Annual production: 200,000 tons

The main configurations of the line include: Kronos lime digestion equipment, a calcium hydroxide special mill, a calcium hydroxide special separator, and an atomization system. The whole production line modular design, and combined installation, greatly saved the cost of installation and floor space, compared with the traditional three-stage digestion equipment, saving the steel structure about 1 million yuan. Greatly reduce the customer’s investment cost. Combined installation, distribution, and customer maintenance costs will be very low, but also from another point of view greatly save the later use of costs.

After a tense installation of more than two months, the production line equipment was officially put into operation, after strict technical indicators testing, my company’s calcium hydroxide production line equipment produced by the calcium hydroxide has higher fineness and purity is pure, better than the domestic counterparts.

Performance Parameters of Importance for calcium hydroxide

1. Purity: A high level of purity is essential as it directly affects the quality and effectiveness of the final products in which calcium hydroxide is used.
2. Particle size distribution: The size of the particles influences the reactivity and solubility of the powder, which is critical in various applications.
3. Chemical reactivity: This parameter determines the speed and efficiency of chemical reactions involving calcium hydroxide.
   Reasons for Significance

The reasons these parameters are important include:

1. Purity ensures consistent and reliable performance in industrial processes, reducing the risk of impurities causing adverse effects.
2. Optimal particle size distribution enhances the homogeneity and efficiency of reactions, improving product quality and reducing production costs.
3. High chemical reactivity leads to faster processing times and better outcomes in applications such as neutralization and pH adjustment.

Calcium hydroxide powder finds extensive use in several areas:

1. Construction: It is used in mortar and plaster for its binding and hardening properties.
2. Environmental remediation: To treat acidic wastewater and soil.
3. Chemical manufacturing: As a raw material in various chemical processes.

The performance parameters of calcium hydroxide identified by business owners play a vital role in determining the quality and application scope of the product. Understanding these factors is crucial for the continued growth and development of the calcium hydroxide industry.

1. It can be used in the flocculation treatment of industrial wastewater such as papermaking, petroleum, chemistry, metallurgy, metals, mineral processing, food, dyeing, etc., to adjust the pH value of tap water and acidic wastewater and to condition sludge.
2. It is used in industries such as thermal power plant desulfurization, flue gas desulfurization, deacidification, termination of phosphates and most heavy metals. It is also used as a raw material for the manufacture of calcium carbide, soda ash, and bleaching powder, and as a raw material for epoxy adhesives. It is also used in building materials, metallurgical fluxes, and cement accelerators. It is also used as plant deoiling and decolorizing agent, soil conditioner and boiler plant protective agent.
3. It can also be used in wastewater to remove phosphates and most heavy metals, disinfect and sterilize, remove ammonia nitrogen from water, break emulsions and coagulate, etc.

Site situation

After the lumpy lime is initially digested by the Cronus lime digester, it then enters the customized digestion tank for secondary digestion to obtain more finished products. The finished product can be directly passed through a special calcium hydroxide powder separator to    high-grade calcium hydroxide powder, and the tailings can be processed into a 325-mesh fine powder through a special calcium hydroxide grinding mill.

Customer Reviews

The Raymond mill originally used by other factories did not work well. Later, a Cronus calcium hydroxide mill was installed, which doubled the production capacity with the same power. Later, our company installed the entire calcium hydroxide production line. The stability of the product and the energy consumption of the production line are indeed higher than those of other nearby manufacturers that produce calcium hydroxide powder. We are very satisfied.

Calcium oxide can be used in the flocculation treatment of industrial wastewater such as papermaking, petroleum, chemistry, metallurgy, metals, mineral processing, food, dyeing, etc., and in adjusting the pH value of tap water and acidic wastewater and conditioning sludge. It can also be used to remove phosphates and most heavy metals, kill bacteria and viruses, and remove ammonia nitrogen from water.

• Processing materials: quicklime
• Output: 15~20t/h
• Feed particle size: 0~30mm
• Discharge particle size: 200~325 mesh

Site situation

The materials are output from the raw material bin, fed the GK2150 calcium oxide mill raymond mill through the belt feeder, and undergo deep processing. The ground materials enter the collector, and the finished product has a particle size of 200~325 mesh.

Customer Reviews

We have been deeply involved in the industry for many years and have strict requirements on suppliers. As a representative of local machinery manufacturing enterprises in Guangxi, Guilin Mining Machinery, especially in the field of mining and grinding machinery, has strong strength and scale. Therefore, we chose GUIKUANG as the equipment supplier for this production expansion project.

• Output: 10~15t/h
• Feed particle size: ≤40mm, 80%≤20mm
• Discharge particle size: 200 mesh, D80 passed
• Processing materials: Bituminous coal, anthracite coal mixture

Site situation

Raw coal is fed into the CRLM1500M vertical coal mill through a closed quantitative coal feeder. At the same time, the hot air from the heating furnace enters the vertical coal mill from the air inlet under the guidance of the system fan, and fully interacts with the raw coal being ground in the mill. After the heat exchange, the pulverized coal is brought up for sorting at the separator. The coarse pulverized coal with unqualified fineness falls back onto the grinding disc for grinding. The pulverized coal with qualified fineness enters the explosion-proof air box pulse dust collector with the air flow and is dusted. Collected, the collected pulverized coal finished product passes through the discharge port and is sent to the next link by the conveying device for use. The entire system operates under negative pressure, and system dust does not escape, thus ensuring the cleanliness of the site.

Customer Reviews

After comprehensive comparison and layer-by-layerion of multiple equipment of the same type, we finally  chooseed Cronus’s CRLM vertical coal mill as the host equipment of this blast furnace injection pulverized coal preparation system. This is not only because of the operation of this equipment Stable, reliable in quality, environmentally friendly and clean, it is a good helper for coal injection pulverization in energy conservation and emission reduction actions, especially because of Cronus’s considerate after-sales service.

The client is a newly established new material research and development technology company. The company uses limestone from the stone quarry as raw material and focuses on the research and development and production of nano carbon calcium series products. The project plans to use 350 acres of land, with a planned investment of 500 million yuan, and a construction period of 3 years. In the first phase of the project, a new industrial-grade calcium oxide production line with an annual output of 100,000 tons and an industrial-grade calcium hydroxide with an annual output of 80,000 tons will be built. The current factory and production line construction of the first phase of the project were completed in March 2022 and are currently in production.

• Processing materials: calcium oxide
• Production capacity: 15t/h
• Feed particle size: 0~30mm
• Discharge particle size: 325 mesh
• Processing materials: calcium hydroxide
• Production capacity: 10-20t/h
• Feed particle size: 0~30mm
• Discharge particle size: 200-325 mesh

Site situation

The 400,000 tons/year calcium carbonate deep processing project adopts advanced production technology and equipment, and’s a new energy-saving and environmentally friendly steel mechanical shaft kiln recommended by the national product catalog. While reducing coal consumption, the waste heat of flue gas can be used to preheat stone. Calcium hydroxide uses a fully automatic water-saving two-stage digestion and drying machine, which can significantly reduce production costs while meeting green environmental protection requirements. After the project is put into operation, it will drive local economic development and reduce local employment pressure while obtaining good economic and social benefits.

Customer Reviews

I have been engaged in calcium oxide processing for so many years and have used a lot of equipment. The experience of Cronus’s equipment is very good. Since it was put into operation, production has never been interrupted, the fineness of the powder produced has reached the standard, the output has exceeded expectations, and the quality of the pulverized coal is very good. We are very satisfied. Cronus is a good partner for long-term cooperation.

The disadvantage of inorganic powder fillers and polymers is that their surface or interface properties are different and their compatibility is poor, making it difficult to disperse evenly in the matrix. If they are filled directly or excessively, they can easily lead to a decrease in certain mechanical properties of the material.Therefore, in addition to the particle size distribution requirements, the surface of calcium carbonate must also be treated to improve the physical and chemical properties of its surface, enhance its compatibility and dispersion with organic polymers, and improve the mechanical strength and comprehensive performance of composite materials.

• Processing Material: marble
• Output: 1~6t/h
• Feed Particle size: 0~10mm
• Discharge Particle Size: 800~3000 mesh

Site situation

The materials are output from the raw material bin and fed the CRLMS200X superfine vertical roller mil and secondary ultra-fine classifier through the belt feeder for deep processing. The ground materials enter the collector and the finished product has a particle size of 800~3000 mesh.

Customer Reviews

Our original equipment cannot keep up with production demand and we plan to replace it with new and better equipment. After understanding and research, we finally chose to cooperate with Cronus. The mill we purchased greatly saved labor and energy consumption, and the quality of the powder produced was better.

Special calcium carbonate for artificial stone is a product obtained by using ordinary calcium carbonate ultrafine powder as raw material, adding special ester surfactant, and surface treatment through surface activation equipment. It has low oil absorption value and long-lasting durability in unsaturated resin liquid. Dispersion and anti-settling properties.

• Processing Material: marble
• Output: 4~6t/h
• Feed Particle Size: 0~10mm
• Discharge Particle Size: 800~1250 mesh

Site situation

The material is output from the raw material bin and fed the CRLMS1200X Superfine Vertical Roller Mill through the belt feeder for grinding. The ground material enters the collector and the finished product has a particle size of 800~1250 mesh.

Customer Reviews

This project is our new mineral powder project. We have sufficient supply of raw materials and a relatively good downstream mineral powder market, so we decided to expand production. After comparison, we finally chose the equipment of Cronus. The salesmen and technicians of Cronus are very enthusiastic, and everyone has a pleasant communication. We also believe in the overall strength of Cronus. The project has now been put into production, with qualified output and product fineness and low energy consumption.