Comparison of Moisture Absorption and Desorption Properties of Acid-leaching Residue of Laterite Nickel with Diatomite
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摘要:
通过干燥器法,对红土镍矿酸浸渣和硅藻土在三种湿度下的吸湿性能进行了研究,并比较了二者的放湿性能,对二者的粒度和孔结构进行了分析和比较。研究表明:红土镍矿酸浸渣的调湿性能优于硅藻土,其吸湿量、吸湿速率、放湿量、放湿速率等指标均超过了硅藻土;且红土镍矿酸浸渣的比表面积和粒度均大于硅藻土,结合调湿性能分析,红土镍矿酸浸渣适合作为一种优良的调湿材料。
Abstract:The moisture absorption properties of acid-leaching residue of laterite nickel and diatomite in three kinds of humidity were studied by means of desiccant method, and the moisture desorption properties of the two were compared. The particle size and pore structure of the two were analyzed and compared. The results show that the humidity controlling of acid-leaching residue lateritic nickel is better than diatomite, and its indexes such as moisture absorption, moisture absorption rate, moisture desorption and moisture desorption rate all surpass diatomite. Moreover, the specific surface area and particle size of acid-leaching residue of laterite nickel are larger than diatomite. According to the analysis of humidity controlling, acid-leaching residue of laterite nickel is suitable as an excellent humidity control material.
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表 1 主要化学成分 /%
Table 1. The main chemical composition
成分 SiO2 Al2O3 Fe2O3 CaO MgO TiO2 K2O Na2O LOI 硅藻土 87.05 1.29 0.41 0.01 0.1 0.07 - - 9.65 酸浸渣 79.18 0.32 4.82 0.54 1.17 0.055 0.085 0.54 11.15 表 2 粒度分布
Table 2. The particle size distribution
累计率 d10/μm d50/μm d97/μm 硅藻土/% 2.69 8.70 53.39 红土镍矿酸浸渣/% 4.32 15.66 66.30 表 3 比表面积等孔结构数据
Table 3. The specific surface area and other pore structure data
孔结构 比表面积/(m2·g-1) 孔体积/(cm3·g-1) 孔径/nm 硅藻土 10.681 0.025 7.893 红土镍矿酸浸渣 84.196 0.180 7.661 -
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