Overview
Bauxite refractory aggregate is a calcined or sintered form of bauxite ore, primarily composed of alumina (Al₂O₃) and silica (SiO₂). It is valued in high-temperature industries for its ability to withstand thermal shock and corrosive environments. The material is processed into graded particles (e.g., 0–1mm, 1–3mm) to suit specific refractory formulations. China, Guyana, and Brazil are major producers, with grades classified by alumina content (e.g., 70%, 80%). Its cost-effectiveness compared to pure alumina makes it a preferred choice for mid-range refractory applications.
Physical and Chemical Properties
The aggregate's performance hinges on its alumina content (typically 50–85%), which directly correlates with refractoriness. Higher alumina grades (≥80%) exhibit melting points above 1800°C. The material has low porosity (<5% in sintered forms) and high mechanical strength, ensuring durability under thermal cycling. Chemically, it is inert to most slags and fluxes, though prolonged exposure to alkaline environments may cause degradation. Its thermal expansion coefficient (5–6×10⁻⁶/°C) is lower than many alternatives, reducing cracking risks.
Main Applications
Bauxite aggregate is a cornerstone in refractory products for steel, cement, and glass industries. It forms the backbone of high-alumina bricks used in blast furnaces and ladles. In monolithic refractories, it serves as the aggregate phase in castables and gunning mixes for kiln linings. Beyond traditional uses, it is employed in incinerators and petrochemical reactors. Recent innovations include its role in lightweight insulating refractories when expanded via controlled sintering.
Safety and Storage
While non-hazardous under normal conditions, airborne dust from handling may irritate respiratory systems. NIOSH-approved dust masks and goggles are recommended during bulk processing. The material is non-combustible but may release crystalline silica dust at high temperatures. Storage requires protection from moisture to prevent hydration of reactive phases. Bulk bags or sealed silos are preferred. Shelf life is indefinite if kept dry, though caking may occur in humid climates.
B2B Procurement Guide
Buyers should prioritize suppliers offering certified chemical analysis (XRF reports) for Al₂O₃, Fe₂O₃, and SiO₂ content. Particle size distribution (PSD) must match application needs—narrow cuts for precision castables, broader ranges for ramming mixes. Benchmark prices against LME alumina indexes, as bauxite aggregates often trade at 30–50% of Al₂O₃ prices. Consider FOB vs. CIF terms carefully; bulk shipments (20–25 MT containers) typically offer 15–20% cost savings over bagged goods.
Related Manufacturers
- 主营：油漆陶瓷原料、添加用硅酸铝粉、煅烧高岭土、铝矾土、水洗高岭土、滑石粉、膨润土、黄陶土、红陶土、轻质碳酸钙、重质碳酸钙、重晶石粉、石英砂、沸石粉、海泡石
- 主营：刚玉浇注料、高铝砖、高铝浇注料、耐火浇注料、耐火混凝土、耐火水泥、耐火骨料、耐火砖、高铝骨料、耐火涂抹料、高强耐磨浇注料、低水泥浇注料、高铝水泥、铝酸盐水泥、耐热混凝土、钢纤维浇注料
- 主营：云母、蛭石、轮胎粉、铝矾土、彩砂、蛭石板、阻火模块、石英砂、无石棉矿物复合纤维、木质纤维、海泡石
- 主营：耐火材料、耐火浇注料、耐火骨料、粘土砖、高铝砖
- 主营：超细硅酸铝粉、硅藻土、膨润土、铝矾土、高岭土、滑石粉、彩砂、透明粉、白炭黑、金刚砂、石墨、海泡石、木粉、轻钙、重钙、玻璃粉、贝壳粉、凹凸棒土、玻璃鳞片、陶土、火山岩、电气石粉、合成云母、赤铁粉
- 主营：磁粉、铁粉、铁砂、铝矾土、硅藻土、膨润土、轻钙、重钙、氢氧化钙、氧化钙、煅烧滑石粉、膨润土颗粒、硅灰、活性白土、萤石粉、石英粉、高岭土、沸石粉、煅烧高岭土、莫来砂、珍珠岩粉、玻璃粉、贝壳粉、远红外粉、凹凸棒土
- 主营：氧化铁颜料、沸石粉、铁砂、耐火材料、电气石粉、氧化铁棕、除渣剂、橡胶粉、氧化铁灰、四氧化三铁、高岭土、玻璃粉、磁粉、氧化铁黑、滑石粉、减水剂、碳酸钙、萤石粉、红色颜料、氧化铁黄、硅微粉、氧化铁红、伊利石粉、氟化钙粉、贝壳粉
- 主营：真石漆、沙子全、腻子粉、铝矾土、粘土球、白沙子、烘干沙、膨润土、40目河沙、烘干河沙、水族婚庆、抗裂砂浆、钙粉工业、塑料橡胶、喷砂除锈、环氧草坪、人造沙滩、石粉填充、砂浆抹面、钻井泥浆、公园造景、石粉砂浆、石粉沙子、白色沙子、pvc填充料、河沙园艺
- 主营：高铝砖、刚玉砖、浇注料、耐火泥、耐火水泥、耐火球、耐火材料、保温砖、粘土砖、陶瓷蓄热体、陶瓷纤维产品、保温材料
- 主营：高铝砖、粘土砖、浇注料、耐火球、耐火泥、耐火砖、轻质保温砖、莫来石刚玉砖、氧化铝空心球砖
- 主营：彩色石子、彩沙、有机覆盖物、铝矾土、火山岩、石英砂、彩色玻璃砂、蛭石、岩片、钙粉、鹅卵石、膨润土、粉煤灰、油田堵漏剂、高岭土、木粉、河沙、石膏粉、珍珠岩、陶粒、金刚砂
- 主营：碳酸钙、高岭土、滑石粉、铝矾土、负离子、金刚砂、贝壳粉
- 主营：岩片、染色岩片、蛭石、铝矾土、云母、石英砂、雨花石、染色云母、机制炭、烧烤炭、白云石、石子、五彩石
- 主营：玻璃鳞片、煅烧高岭土、叶腊石、铝矾土、膨润土、滑石粉、硅灰、萤石粉、沉淀硫酸钡、重钙、轻钙、硅藻土、珍珠岩、玻璃微珠、重晶石粉、S95矿粉、透明粉、玻璃砂、云母粉、木炭、硅酸铝粉、长石粉、玻璃粉、贝壳粉
- 主营：硅灰石粉、矿粉、硅灰、铝矾土、长石粉、高岭土、玻璃粉、膨润土、玻璃鳞片、萤石粉
- 主营：白云石粉、玻璃砂、玻璃微珠、铝矾土、硅灰、硅线石、硅藻土、海泡石纤维、滑石粉、钾钠长石粉、矿渣粉、蓝晶石、麦饭石粉、硼砂、膨润土、羟基磷灰石、石英粉、石英砂、土状石墨/鳞片石墨、氧化铝、石墨、萤石粉、氧化钙、叶蜡石粉、铁粉