Comparative study of acid mine drainage using different neutralization methods

被引:4
|
作者
Huang, Zhong-sheng [1 ,2 ,3 ]
Yang, Tian-zu [1 ]
机构
[1] Cent South Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China
[2] State Key Lab Comprehens Utilizat Low Grade Refra, Xiamen 3361101, Fujian, Peoples R China
[3] Zijin Min Grp Co Ltd, Shanghang 364200, Fujian, Peoples R China
来源
WATER PRACTICE AND TECHNOLOGY | 2021年 / 16卷 / 03期
关键词
acid mine drainage; comparative study; lime; limestone; single-stage neutralization; two-stage neutralization; HEAVY-METALS; BY-PRODUCTS; REMOVAL; OPTIONS;
D O I
10.2166/wpt.2021.039
中图分类号
TV21 [水资源调查与水利规划];
学科分类号
081501 ;
摘要
Two-stage acid mine drainage (AMD) neutralization residue yield is 2.57 t/t acid equivalent using limestone and lime, 15.74% less than the 3.05 t/t acid equivalent yield from single-stage lime neutralization residue. XRD results shows that the main residue component generated by two-stage neutralization is CaSO4 center dot 0.5H(2)O, with a molecular weight 15.70% lower than the CaSO4 center dot 2H(2)O generated in single-stage neutralization. The differing amount of gypsum crystallization water from the different neutralization processes is the main cause of the different residue yields. While the actual removal rate and pH of Fe3+ are consistent with the theory, those for Zn2+, Cu2+ and Al3+ are inconsistent with the theoretical values, the error rate increasing with increasing pH. Co-precipitation with and adsorption by Fe(OH)(3), mainly generated during neutralization, are the main reasons for the difference. The cost of two-stage neutralization is 16.60% less than that of single-stage neutralization when the initial reaction pH is 3.4, but the unit cost begins to increase if the initial reaction pH is raised above 3.4. When the initial pH is 4.0, the cost of two-stage neutralization exceeds that of single-stage neutralization by 4.07%.
引用
收藏
页码:1026 / 1035
页数:10
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