Physicochemical Properties and Humidity Control and Formaldehyde Adsorption of De-nickel Silicon Slag
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摘要: 脱镍硅渣是红土镍矿经酸浸法提取镍及其它金属后剩余的固体废弃物。本文研究了国内进口的印尼红土镍矿脱镍硅渣的理化特性及调湿与甲醛吸附性能。结果表明,红土镍矿脱镍硅渣的主要矿物成分为非晶质二氧化硅,化学成分除氧化硅、氧化铝、氧化钙、氧化镁、氧化铁等外,还含有少量的重金属;多孔结构,孔径主要为介孔,平均孔径7.661 nm,孔体积0.18 cm3/g,比表面积84.196 m2/g;具有良好吸/放湿性能和甲醛吸附性能;可以用于开发高性能调湿和空气净化材料。Abstract: De-nickel silicon slag is the solid waste remaining after nickel and other metals are extracted from laterite nickel ore by acid leaching. In this paper, the physicochemical properties, humidity control and formaldehyde adsorption properties of De-nickel silicon slag from laterite nickel ore in Indonesia were studied. The results showed that the main mineral component of the De-nickel silicon slag from laterite nickel ore was amorphous silica. The chemical components contain a small amount of heavy metals in addition to silicon oxide, aluminum oxide, calcium oxide, magnesium oxide, and iron oxide. The pore size was mainly mesopores, the average pore size was 7.661 nm, the pore volume was 0.18 cm3/g, the specific surface area was 84.196 m2/g. It had good absorption/desorption performance and formaldehyde adsorption performance. Therefore, it can be used to develop high-performance humidity control and air purification materials.
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表 1 脱镍硅渣的粒度分布
Table 1. The granularity distribution of De-nickel silicon slag
Grand total D3 D6 D10 D16 D25 D50 D75 D84 D90 D97 Size /μm 1.51 2.14 2.79 3.76 5.35 10.47 18.34 24.74 31.93 53.09 表 2 脱镍硅渣主要化学成分
/% Table 2. The main chemical composition of De-nickel silicon slag
Composition SiO2 Al2O3 Fe2O3 CaO MgO TiO2 K2O Na2O LOI Content 78.95 0.67 0.92 0.18 0.24 0.06 0.085 0.54 11.15 表 3 脱镍硅渣的比表面积、孔径和孔体积分析结果
Table 3. Specific surface area, pore diameter and pore volume analysis results of De-nickel silicon slag
Specific surface area
/(m2·g-1)Average pore size
/nmPore volume
/(cm3·g-1)84.196 7.661 0.180 表 4 脱镍硅渣重金属含量
Table 4. The heavy metal content of De-nickel silicon slag
Composition Pb Cr Ba As Sb Cd Hg Content/(g·t-1) 58 4 245 8 842 125 91 2 0 表 5 脱镍硅渣的48 h最大吸放湿量
Table 5. 48 h maximum moisture absorption and release capacity of De-nickel silicon slag
Humidity control performance Maximum moisture absorption /% Maximum moisture release /% Environment humidity or temperature/℃ 33% 75% 85% 98% 75% 85% 98% 13 4.89 8.42 12.16 18.69 3.64 7.09 13.91 23 4.65 7.84 10.79 23.46 3.22 6.21 18.87 33 4.25 7.19 10.11 26.01 2.94 5.72 21.80 43 4.12 6.75 8.77 27.67 2.71 4.68 23.56 -
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