Overview
Precipitated bleaching clay is an acid-activated aluminum silicate derived from natural bentonite or montmorillonite clays. Through controlled sulfuric or hydrochloric acid treatment followed by washing and drying, its surface area and adsorption capacity are significantly enhanced compared to raw clay. This material plays a critical role in industrial purification processes, particularly in the food and energy sectors. Its development in the early 20th century revolutionized oil refining by providing an efficient, reusable alternative to animal charcoal for decolorization.
Physical and Chemical Properties
The material exhibits a microporous structure with a typical surface area of 150-300 m²/g after activation. Its layered lattice structure contains exchangeable cations that contribute to selective adsorption of pigments, phospholipids, and oxidation products. Key metrics include acid value (pH 2.5-4.5 in 10% slurry), bulk density (0.7-0.9 g/cm³), and particle size distribution (90% <75μm). The activation process creates both Brønsted and Lewis acid sites that facilitate chemical adsorption alongside physical filtration mechanisms.
Main Applications
In edible oil refining, bleaching clay removes chlorophyll, carotenoids, and oxidation products during the neutralization process. Typical dosage ranges from 0.3%-2% of oil volume depending on impurity levels. The petroleum industry utilizes it for lubricant and paraffin wax purification. Emerging applications include biodiesel post-treatment and recycling of used cooking oils. In these processes, the clay not only decolorizes but also reduces soap content and trace metals. Some pharmaceutical manufacturers employ medical-grade variants for antibiotic purification.
Safety and Storage
As an acid-activated material, proper handling requires nitrile gloves, dust masks, and eye protection to prevent irritation. Bulk storage silos should incorporate humidity control (<60% RH) to maintain activity, as moisture reduces adsorption capacity. Spent clay contains absorbed oils and may undergo spontaneous combustion if stored improperly. Disposal regulations vary by jurisdiction, with some regions permitting land application after pH neutralization while others classify it as special waste requiring thermal regeneration.
B2B Procurement Guide
Industrial buyers should evaluate suppliers based on consistent activation levels (measured by montmorillonite content ≥85%), low residual acid (≤0.3% free H2SO4), and batch-to-batch uniformity. Request laboratory-scale bleaching tests with your specific feedstock. Logistics considerations include bulk bag vs. palletized options - 25kg bags are common for trial orders while 1-ton super sacks reduce handling costs for regular shipments. Leading manufacturers are concentrated in China, India, and the US, with production facilities typically located near raw material sources.
Related Manufacturers
- 主营：耐火浇注料、酸性炉衬材料、高效除渣剂、漂白土、铝矾土高铝细粉、石墨化增碳剂、透热炉打结料、线圈胶泥、中性炉衬材料、导电粉、中间包可塑料、打炉料、干振料、刚玉炉衬料、硅藻土、电气石托玛琳粉、膨润土、重晶石硫酸钡粉、蛭石、高岭土、橡胶颗粒粉、石英沙石英粉、绿泥白泥修补料、凹凸棒土、重质轻质碳酸钙、雨花石炉料
- 主营：生物质颗粒、防火涂料、膨润土、漂白土、云母粉、蛭石、石英砂、碳酸钙、高岭土、重钙、1250目云母粉、萤石粉、莫来砂、铁砂、火山石、夜光石
- 主营：地坪料、新疆银白色蛭石、云母、漂白土、滑石粉、白炭黑、硅藻土、贝壳粉、玻璃粉、陶瓷砂、木粉、高岭土、重钙、轻钙、玻璃砂、玻璃微珠、活性白土、铁砂、珍珠岩、重晶石、膨润土、防火涂料、海泡石、硅灰、炭黑、营养土
- 主营：磁粉、铁粉、铁砂、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：钻井泥浆、高岭土、玛瑙原石、漂白土、玻璃微珠、重钙粉、火山石、石英砂、硅藻土、铝矾土、硫化铁、莫来砂、碳化硅、气相白炭黑、煤灰粉、过滤活性炭、空心漂珠、活性碳酸钙、膨润土、方解石粉、电气石粉、玻璃粉、硅酸铝镁、长石粉、硅灰石粉、滑石粉
- 主营：高岭土、膨润土、云母、滑石粉、重晶石、碳酸钙、硅灰粉、白炭黑、玻璃粉、金刚砂、蛭石、彩色树皮、喜马拉雅盐、硅藻土、陶瓷砂、麦饭石
- 主营：高岭土、滑石粉、纳米仿瓷砂颗粒、重晶石、重钙、膨润土、硅藻土、麦饭石、绿沸石、海泡石、氧化铁、玻璃珠、玻璃粉、白炭黑、有机覆盖物、松树皮、玻璃砂、金刚砂、蛭石、火山石
- 主营：滑石粉、白陶土、碳酸钙、金刚砂、石英砂、白云石砂、耐火材料、地坪材料、彩色地坪料、高尔夫球场、耐磨地坪硬化剂
- 主营：真石漆、陶瓷球、扩香石、火山石、玻璃砂、暖宝贴、火焰石、莫来砂、花盆土、鹅卵石、填香炉、黑金砂石、建筑石子、碳酸钙粉、机制木炭、保温材料、养花园艺、装饰摆件、金色彩砂、防水地坪、石英砂滤料、石英砂炉料、中频炉胶泥、家装彩石扁珠、中性炉衬材料
- 主营：铁砂、铁粉、重钙、轻钙、氧化钙、白水泥、滑石粉、膨润土、红土黄土、硅灰、硅藻土、活性白土、萤石粉、石英粉、重晶石粉、高岭土、沸石粉、莫来砂、珍珠岩粉、膨润土猫砂、赤铁粉、粉煤灰、锰砂、石英砂
- 主营：中华麦饭石、石英砂、火山石
- 主营：铁砂铁粉、滑石粉、硅藻土、赤铁红、红土黄土、沸石粉、木粉、重钙、轻钙、磁粉、膨润土、锰砂、硅灰、活性白土、石英粉、萤石粉、重晶石粉、高岭土、莫来砂、珍珠岩粉、粉煤灰、白水泥、远红外粉
- 主营：高岭土、玻璃鳞片、轻钙、空心玻璃微珠、氢氧化铝、S95矿粉
- 主营：贝壳粉、硅灰、重钙、漂白土、轻钙、碳酸钙粉、膨润土、煤矸石粉、硅酸铝粉、硅酸铝纤维、滑石粉、珍珠岩粉、蛭石粉、方解石粉、硅藻土、玻璃粉、氧化镁粉、白云石粉、火山石粉、铝矾土、全加密硅灰、半加密硅灰
- 主营：润滑剂、石墨粉、超细石墨粉、阻燃石墨、超细石墨、高纯石墨、煅烧高岭土、耐火泥造纸、润滑石墨铅粉、合成氟金云母粉、高岭土、种子包衣粉、麦饭石粉、白色电气石粉、远红外粉、导电石墨粉、耐高温石墨粉、云母片、天然云母片、耐高温云母片、透明云母片、云母板、沸石、沸石粉、麦饭石颗粒
- 主营：鹅卵石、水洗石、荧光石、石英砂、金刚砂、滑石粉、火山石、砾石、石子、白沙子、石墨粉
- 主营：氧化铁颜料、沸石粉、铁砂、漂白土、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、耐火材料、氧化铁红、伊利石粉、氟化钙粉、贝壳粉
- 主营：碧水安、海藻精、氢氧化铝、氨基酸原粉、聚合硫酸铁、卡松、木质素磺酸钠、水玻璃、除臭剂、过硫酸氢钾改底片、高铁酸钾、大苏打、饲料级小苏打、液体硅酸钠、葡萄糖酸钠、工业级尿素、工业葡萄糖、醋酸钠、甘蔗糖蜜液、活性白土、速溶硅酸钠、飞灰螯合剂、管道疏通剂、硅油
- 主营：高岭土、重质碳酸钙、碳酸钙、沉淀硫酸钡、滑石粉、海泡石、石灰石、硅藻土、一级矿粉、萤石矿石、活性钙、氢氧化钙、氧化钙、膨润土、透明粉、硅酸铝粉、贝壳粉、彩砂、轻钙、萤石粉、水镁石、矿粉、铸石粉、浴沙、金玉明砂
- 主营：石墨、膨胀石墨、导电石墨粉、防静电墨粉、阻燃石墨粉、鳞片石墨粉、超细石墨粉、云母、云母片、茶色云母片、云母粉、电气石、电气石粉、电气石颗粒、天然云母片、透明云母片、导热石墨、绝缘云母片、耐高温云母、云母板、岩片、贝壳片、膨润土、钙基膨润土、纳基膨润土
- 主营：白云石粉、玻璃砂、玻璃微珠、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、铝矾土、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
- 主营：真石漆、沙子全、腻子粉、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：润滑油、氯化铵、磷酸二氢钾、工业级漂白土、白油、减水剂、氯化钾、乙二醇、柠檬酸、辛醇
- 主营：泡花碱、工业淀粉、矿源黄腐酸钾、工业葡萄糖、工业柠檬酸、固化剂、氨基酸原粉、工业红糖、大苏打
- 主营：洗涤碱、腐植酸钠、矿源黄腐酸钾、漂白土、清洗剂、全水溶叶面肥、植物精油、洗涤助剂、处理电镀、水产养殖、氨基酸原粉、磷酸二氢钾、建筑添加剂、漂白氧化剂、洗涤添加剂、混凝土添加剂、瓜果蔬菜生根、锅炉管道清洗、营养性添加剂、柠檬酸、工业柠檬酸、活性白土、大蒜油、EDTA
- 主营：珍珠岩、玻化微珠、珍珠岩保温板、园艺珍珠岩、闭孔玻化微珠、珠光砂
- 主营：碳酸钙粉、轻质碳酸钙、重质碳酸钙、漂白土、活性碳酸钙、膨润土、水磨石石子、方解石、石灰石、硅微粉、石英砂、石英粉、重晶石、硫酸钡、金刚砂、钢渣、鹅卵石、彩砂、氧化钙、氢氧化钙