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酸性残渣对天津滨海盐碱土的改良效果 被引量:5
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作者 马妍 尹建道 +1 位作者 张建唐 刘立民 《江苏农业科学》 北大核心 2017年第23期251-253,共3页
以天津滨海盐碱土改良利用为目的,选择3种酸性残渣废弃物(醋渣、酒糟、糠醛渣)作为土壤改良剂,进行单因素土柱试验研究。结果表明,掺拌酸性残渣废弃物能够明显改善土壤的渗透性能,提高脱盐效率,同时抑制脱盐碱化程度,是一种两全其美的... 以天津滨海盐碱土改良利用为目的,选择3种酸性残渣废弃物(醋渣、酒糟、糠醛渣)作为土壤改良剂,进行单因素土柱试验研究。结果表明,掺拌酸性残渣废弃物能够明显改善土壤的渗透性能,提高脱盐效率,同时抑制脱盐碱化程度,是一种两全其美的废弃物资源化利用途径。醋渣和酒糟增强渗透性能较强,糠醛渣抑制脱盐碱化的能力较强。改良程度的大小与添加比例相关,一般情况下20%的添加量基本能够满足改土要求。 展开更多
关键词 天津 盐碱土改良 酸性残渣 废弃物资源化
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Leaching kinetics of acid-soluble Cr(Ⅵ) from chromite ore processing residue with hydrofluoric acid 被引量:4
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作者 李小斌 徐文彬 +2 位作者 周秋生 彭志宏 刘桂华 《Journal of Central South University》 SCIE EI CAS 2011年第2期399-405,共7页
Leaching kinetics of acid-soluble Cr(VI) in chromite ore processing residue (COPR) using hydrofluoric (HF) acid solution as a leaching agent was investigated for potential remediation of COPR with industrial was... Leaching kinetics of acid-soluble Cr(VI) in chromite ore processing residue (COPR) using hydrofluoric (HF) acid solution as a leaching agent was investigated for potential remediation of COPR with industrial waste water containing HF. The results show that HF can effectively destabilize the Cr(VI)-bearing minerals, resulting in the mobilization of Cr(VI) from COPR into the leachate. Particle size significantly influences the leaching of acid-soluble Cr(VI) from COPR, followed by leaching time, whereas the effects of HF concentration and leaching temperature are slight and the influence of stirring rate is negligible. The leaching process of acid-soluble Cr(VI) from COPR is controlled by the diffusion through the product layer. The apparent activation energy is 8.696 kJ/mol and the reaction orders with respect to HF concentration and particle size is 0.493 8 and -2.013 3, respectively. 展开更多
关键词 LEACHING KINETICS hydrofluoric acid hexavalent chromium chromite ore processing residue
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Use of Alkaline Slag and Crop Residue Biochars to Promote Base Saturation and Reduce Acidity of an Acidic Ultisol 被引量:5
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作者 M.M.MASUD LI Jiu-Yu XU Ren-Kou 《Pedosphere》 SCIE CAS CSCD 2014年第6期791-798,共8页
This investigation was conducted by using alkaline slag and crop straw biochars to reduce acidity of an acidic Ultisol through incubation and pot experiments with lime as a comparison. The soil was amended with differ... This investigation was conducted by using alkaline slag and crop straw biochars to reduce acidity of an acidic Ultisol through incubation and pot experiments with lime as a comparison. The soil was amended with different liming materials: lime(1 g kg-1),alkaline slag(2 and 4 g kg-1), peanut straw biochar(10 and 20 g kg-1), canola straw biochar(10 and 20 g kg-1) and combinations of alkaline slag(2 g kg-1) and biochars(10 g kg-1) in the incubation study. A pot experiment was also conducted to observe the soybean growth responses to the above treatments. The results showed that all the liming materials increased soil p H and decreased soil exchangeable acidity. The higher the rates of alkaline slag, biochars, and alkaline slag combined with biochars, the greater the increase in soil p H and the reduction in soil exchangeable acidity. All the amendments increased the levels of one or more soil exchangeable base cations. The lime treatment increased soil exchangeable Ca2+, the alkaline slag treatment increased exchangeable Ca2+and Mg2+levels, and the biochars and combined applications of alkaline slag with biochars increased soil exchangeable Ca2+, Mg2+and K+and soil available P. The amendments enhanced the uptake of one or more nutrients of N, P, K, Ca and Mg by soybean in the pot experiment. Of the different amendments, the combined application of alkaline slag with crop straw biochars was the best choice for increasing base saturation and reducing soil acidity of the acidic Ultisol. The combined application of alkaline slag with biochars led to the greatest reduction in soil acidity, increased soil Ca, Mg, K and P levels, and enhanced the uptake of Ca, Mg, K and P by soybean plants. 展开更多
关键词 alkaline amendment exchangeable acidity exchangeable base cation soil pH soybean growth
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