In the first half of 2026, a total of 41 aluminum projects across China started construction or were commissioned. Shunbo Alloy’s 500,000 tpa aluminum sheet and strip project entered the trial production stage, while Huafeng Aluminum initiated preparations for its 550,000-ton high-end aluminum sheet, strip and foil project. While aluminum processing capacity keeps expanding, one easily overlooked segment is under mounting pressure: melting furnace linings.

The temperature of molten aluminum generally ranges from 700℃ to 850℃. Though this temperature may seem moderate, aluminum features extremely high chemical activity. Typical challenges for refractories under aluminum melting and casting conditions are as follows: molten aluminum penetrates the lining through pores, undergoes reduction reactions with silica and other constituents in the refractory, precipitates free silicon and forms corundum phases. Continuous growth of corundum nodules leads to spalling of the lining. In mild cases, the quality of molten aluminum is contaminated; in severe cases, unplanned furnace shutdowns occur.

For aluminum processors, every furnace shutdown in the melting and casting section means output losses for the whole production line. The selection of refractories is evolving from simply purchasing consumables into a critical decision that affects line efficiency.

Dual Trends: Rising Adoption of Unshaped Refractories and Precast Blocks

In terms of product forms, refractories for aluminum melting and casting are undergoing structural adjustment. China’s total output of refractory products reached 22.07 million tons in 2024. Among them, dense shaped refractory products posted a 6.07% output decline, whereas unshaped refractories and thermal insulation products proved relatively resilient. This trend is especially prominent in aluminum melting and casting. Unshaped materials such as castables and ramming mixes are replacing some traditional refractory bricks, thanks to flexible installation and energy-saving advantages.

The rise of precast blocks represents another technical route. Prefabricated and pre-baked refractory components are manufactured in factories and only require masonry and installation on site, greatly shortening the furnace shutdown and maintenance window. Take composite precast cast blocks for molten aluminum ladles as an example: the working layer adopts dense castables in direct contact with molten aluminum, the insulation layer uses low-density castables, and ceramic fiber is filled between the steel shell and precast blocks to absorb thermal expansion stress. Large-format precast blocks reduce the number of masonry joints, essentially lowering the risk of molten aluminum penetration along brick joints.

Anti-Aluminum-Wetting Mechanism Becomes a Technical Focus

Technical solutions for molten aluminum penetration are shifting from passive resistance toward active non-wetting performance. Recently published patents show that adding modified graphite powder adjusts the wetting angle between refractory castables and molten aluminum, preventing molten aluminum from spreading over the material surface and thereby inhibiting penetration and chemical reactions. Another approach forms a thin interfacial film between molten aluminum and refractories with specific additives to block aluminum infiltration.

The shared goal of these technical paths is to achieve low reactivity, non-wetting performance against molten aluminum and easy cleaning for refractories under aluminum melting conditions. This extends lining service life, reduces slag removal frequency and mitigates the risk of molten aluminum contamination.

Regional Capacity and Market Landscape

China’s refractory industry is characterized by a large overall market scale, numerous small enterprises and clustered regional production. Major production regions include Henan, Liaoning, Shandong and Shanxi, with more than 1,800 manufacturers. Within the niche track of refractories for aluminum melting and casting, market competition is transforming from low-price homogenization toward differentiated performance.

Technology-oriented manufacturers represented by Kaituo New Materials align their product portfolio with such industry trends. According to public EIA documents, the company is located in Pingmo Town, Xinmi City, with production lines planned for unshaped refractories and precast refractory blocks targeting aluminum melting & casting and non-ferrous smelting. As an important refractory industrial cluster in Henan, Xinmi-based local manufacturers enjoy advantages in raw material supply, production cost and rapid regional service response.

The sector is clearly moving toward green low-carbon development and circular economy. Breakthroughs have been achieved in spent refractory recycling technologies. An electromagnetic separation – high-temperature reduction process can raise the purity of recycled magnesia to 96.8%, and the national recycling rate for refractories exceeded 45% in 2025. For aluminum melting refractories, the next technical challenge lies in cutting the carbon footprint of products while maintaining resistance to molten aluminum erosion.

Shift in Sourcing Logic

Aluminum processors are changing the way they select refractory materials. Previously, buyers focused on unit price; today they evaluate total life‑cycle cost: lining service life, shutdown & maintenance frequency, labor and time for installation, and whether finished aluminum quality will be compromised. This shift forces refractory suppliers to evolve from mere product vendors into system solution providers covering “materials + installation + operation & maintenance”.

For aluminum melting plants, refractories are no longer merely consumable expenses on financial sheets, but a key variable influencing overall production line efficiency.