Cut-off net acid generation pH in predicting acid-forming potential in mine spoils.
Cut-off net acid generation pH in predicting acid-forming potential in mine spoils.
复制标题
预测矿渣中产酸潜力的截断净酸生成 pH 值。
DOI：
10.2134/jeq2006.0420
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发表时间：
2007-05
影响因子：
2.4
通讯作者：
中科院分区：
文献类型：
--
作者：
矿山废物的酸化会导致一系列环境问题，如酸排水、重金属活化和生态系统退化。成酸潜力预测是含硫矿山废弃物管理的关键步骤之一。采用净产酸(NAG)法研究了中国17个矿点180个矿渣样品的产酸潜力。样品含有不同含量的总硫(0.6~200g kg(-1))、黄铁矿硫(0~100g kg(-1))和酸中和能力(ANC，范围-41~274 kg H_2SO_4 t(-1))。生酸潜力高的样品一般是由于硫含量高或酸中和能力低所致。样品经过氧化氢氧化后，测定其产酸量和最终的NAG pH。结果表明，最终的NAG pH值给出了酸形成物质和非酸形成物质之间的明确界限。最终NAG pH=5或=5的样品可被归类为非产酸物质，而NAG pH<；或=2.5的样品可被归类为中到重度产酸物质。具有NAG pH>；2.5，但<；5的材料，形成酸的风险较低。NAG下限pH值的确定将作为一种快速、经济有效的操作监测工具，用于矿山废物的矿坑内产酸潜力预测和废物类型分类。
Acidification of mine wastes can lead to a series of environmental problems, such as acid drainage, heavy metal mobilization, and ecosystem degradation. Prediction of acid-forming potential is one of the key steps in management of sulfide-bearing mine wastes. In this paper, the acid-forming potential of 180 mine waste samples collected from 17 mine sites in China were studied using a net acid generation (NAG) method. The samples contained different contents of total sulfur (ranging from 0.6 to 200 g kg(-1)), pyritic sulfur (ranging from 0 to 100 g kg(-1)), and acid neutralization capacity (ANC, ranging from -41 to 274 kg H2SO4 t(-1)). Samples with high acid-forming potential are generally due to their high sulfur content or low acid neutralization capacity. After the samples were oxidized by H2O2, the amounts of acid generation and the final NAG pH were measured. Results indicated that the final NAG pH gave a well-defined demarcation between acid-forming and non-acid-forming materials. Samples with final NAG pH >or= 5 could be classified as non-acid-forming materials, while those with NAG pH <or= 2.5 could be classified as moderate to strong acid-forming materials. Materials with NAG pH > 2.5, but < 5, had low risk of being acid-forming. The confirmation of cut-off NAG pH will be used as a rapid and cost-effective operational monitoring tool for the in-pit prediction of acid-forming potential of mine wastes and classification of waste types.
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影响因子：
4.2
作者：
J. Wong;C. Ip;M. Wong
通讯作者：
J. Wong;C. Ip;M. Wong
影响因子：
5.7
作者：
P. Costigan;A. Bradshaw;R. P. Gemmell
通讯作者：
P. Costigan;A. Bradshaw;R. P. Gemmell
DOI：
--
发表时间：
2000
期刊：
Ecologic Science
影响因子：
--
作者：
Shuhai Wen
通讯作者：
Shuhai Wen
影响因子：
13.6
作者：
S. Jennings;D. Dollhopf
通讯作者：
S. Jennings;D. Dollhopf
影响因子：
8.8
作者：
Tordoff, GM;Baker, AJM;Willis, AJ
通讯作者：
Willis, AJ