Overview
Quicklime powder for pulp is a critical chemical in the papermaking industry, primarily used in the kraft process. It is produced by heating limestone (calcium carbonate) to high temperatures, driving off carbon dioxide to yield calcium oxide. This powder is highly reactive, especially with water, making it essential for digesting wood chips and recovering chemicals in paper mills. Its alkaline nature helps break down lignin in wood, facilitating the separation of cellulose fibers. The kraft process relies on quicklime to regenerate sodium hydroxide from sodium carbonate, ensuring the sustainability of chemical cycles in pulp production.
Physical and Chemical Properties
Quicklime powder is a white to grayish-white solid with a high melting point of 2,572°C and a density of 3.34 g/cm³. It reacts exothermically with water, forming calcium hydroxide (slaked lime) and releasing significant heat. This reaction is crucial in industrial applications, such as adjusting pH levels in pulp digestion. The powder is insoluble in organic solvents but reacts vigorously with acids, making it useful in neutralizing acidic byproducts. Its high alkalinity (pH ~12.4 in solution) and corrosiveness require careful handling to prevent chemical burns or equipment damage.
Main Applications
The primary use of quicklime powder in the pulp industry is in the kraft process, where it digests wood chips and recovers cooking chemicals. It converts sodium carbonate (Na₂CO₃) back into sodium hydroxide (NaOH), a key reagent for pulping. This recycling reduces operational costs and environmental impact. Other applications include wastewater treatment in paper mills, where it neutralizes acidic effluents and precipitates impurities. It is also used in flue gas desulfurization (FGD) to remove sulfur dioxide from emissions, aligning with environmental regulations.
Safety and Storage
Quicklime powder is highly corrosive and requires strict safety measures. Workers must wear gloves, goggles, and respirators to avoid contact with skin, eyes, or lungs. Inhalation can cause respiratory irritation, while ingestion leads to severe internal burns. Storage conditions are critical to maintaining quality. The powder must be kept in airtight, moisture-proof containers to prevent premature hydration. Bulk storage silos should be equipped with desiccants and monitored for humidity. Spills should be neutralized with dry sand or vermiculite, never water, due to the exothermic reaction.
B2B Procurement Guide
When procuring quicklime powder for pulp, prioritize suppliers with ISO certification and a track record in industrial chemicals. Verify the product’s purity (≥90% CaO) through lab analysis, as impurities like magnesium oxide can affect performance. Packaging should be robust, often in multi-layer bags or bulk containers, to prevent moisture ingress. Pricing varies by quantity and regional availability. Large-scale buyers may negotiate contracts for consistent supply. Logistics should account for the material’s reactivity—avoid transporting it during high humidity or rain. Always request Material Safety Data Sheets (MSDS) and ensure compliance with local regulations.
Related Manufacturers
- 主营：聚丙烯纤维、抗裂纤维、短切玻璃纤维、玻纤粉、玻璃纤维毡布、塑钢纤维、聚丙烯网状纤维、玄武岩纤维、聚丙烯腈纤维、纤维素纤维、聚酯纤维、聚丙烯粗纤维、改性玻璃纤维、木质素纤维、钢纤维、聚乙烯醇纤维、混凝土纤维
- 主营：高岭土系列、石英系列、石棉纤维系列、橡胶粉系列、海泡石系列、悬浮剂增稠剂系列、耐火材料系列、氧化铁颜料系列、碳酸钙系列、陶土系列
- 主营：聚丙烯酰胺纸浆纤维、污泥脱水、聚丙烯酰胺
- 主营：火山石、水洗石、石英砂、贝壳粉、滑石粉、云母粉、硅灰粉、蛭石粉、透明粉、果木炭、金刚砂、玻璃珠、陶瓷球、沙滩沙、绿沸石、玻璃砂、高岭土、白云石、膨润土、硅藻土、碳酸钙、地面铺路、保温砂浆、沸石颗粒、贝壳彩片
- 主营：氧化钙、吸收剂、氢氧化鑫安、灰钙粉、石灰粉、高纯氧化钙粉末、块状生石灰原料、工业氢氧化钙粉、脱硫用生石灰、水处理熟石灰粉、活性轻质碳酸钙、纳米轻质碳酸钙、超白活性轻质碳酸、超白轻质碳酸钙、氢氧化钙颗粒、氧化钙颗粒、优质氢氧化钙、优质氧化钙、优质氢氧化钙颗粒、优质氧化钙颗粒、消解熟石灰、二氧化碳吸附剂、氢氧化钙颗粒料、高活性氧化钙、高活性氢氧化钙
- 主营：粘缸剂、造纸柔软剂、树脂控制剂、毛布清洗剂、改良剂、杀菌剂、抑垢剂、烘缸剥离剂、除胶剂、螯合剂
- 主营：膨润土、电气石、莫来砂、杨木粉、云母粉、蛭石粉、碳粉200目、叶腊石粉、海泡石粉、火山石粉、重晶石粉、珍珠岩粉、硅藻土、碳酸钙、石英砂、有机覆盖物、80目锯末、云母20目、防火材料、高岭土、沸石、橡胶涂料、膨胀蛭石、空心漂珠、油田堵漏剂
- 主营：表面施胶剂、苯丙表胶、乳液施胶剂、蜡粉、抗掉毛掉粉剂、中性施胶剂、浆内施胶剂、AKD施胶剂、高分子乳化剂、固体表面施胶剂、纸塑模具防水剂、烷基烯酮二聚体、蜡乳液、松香胶、湿强解离剂、纤维增强剂、干强剂、抗水剂、挺硬剂、拉力增强剂、增白剂、聚丙烯酰胺树脂、涂布润滑剂、涂布分散剂、丁苯乳液
- 主营：架桥剂、YW100 锂萃取剂、端羧基液体丁腈橡胶、生物活性玻璃、10-羟基癸酸、苯乙烯磷酸、肉豆蔻酸镁、硬脂酸钴、全氟三丁胺、乙烯基磷酸二乙酯、磷酸锰铁锂、β-磷酸三钙、十一烯酸、钨酸铝、1-乙炔基环已醇、间二异丙苯、锂硅合金、溴甲酚绿、溴代海因树脂颗粒、红铝、龙涎酮、原丁酸三甲酯
- 主营：火山石、火山石板、吸附竹炭、萤石粉、重晶石粉、铁粉、火山石粉、木粉、石英砂、硅藻土、松树皮、活性炭、陶粒、氧化镁、氧化钙、云母、珍珠岩、蛭石、核桃壳、核桃砂、核桃皮、火山岩
- 主营：氧化钙、膨润土、碳酸钙、麦饭石粉、滑石粉、沸石粉、白云石粉、橡胶粉、石英粉、硅微粉、抗菌粉、木粉、磁粉、海泡石粉、负离子粉、石墨、硅藻土、氢氧化钙、消石灰、陶土、活性白土、金刚砂、二氧化硅、高岭土
- 主营：普通石英砂、金刚砂、鹅卵石、重钙粉、云母、玻璃珠
- 主营：石英砂、金刚砂、白沙子、滑石粉、白云石、金刚砂地坪材料、膨润土、碳酸钙
- 主营：火山石、吸附竹炭、火山石板、重晶石粉、铁粉、木粉、火山石粉、萤石、石英砂、硅藻土、氧化镁、松树皮、玻璃块、氧化钙、高强无收缩灌浆料、陶粒、云母
- 主营：中华麦饭石、石英砂、水洗无烟煤、石英粉、煤粉、远红外粉、粉煤灰、矿粉、水处理磁粉、重晶石粉、石墨、营养土园艺绿化土、高岭土、膨润土、硅藻土、活性白土、电气石、火山石、沸石、炭黑、彩砂、活性炭、碳酸钙、重钙轻钙、鹅卵石