Measurement of pH in high-temperature nickel laterite pressure acid leach process solutions

被引：4
|
作者：
Jankovic, Z. [1 ]
Papangelakis, V. G. [1 ]
机构：
[1] Univ Toronto, Dept Chem Engn & Appl Chem, Toronto, ON M5S 3E5, Canada
来源：
HYDROMETALLURGY | 2010年 / 105卷 / 1-2期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Nickel laterite; Pressure acid leach; pH measurement; High temperature; Yttria-stabilised zirconia; AQUEOUS-SOLUTIONS; SENSORS; MODEL;
D O I：
10.1016/j.hydromet.2010.09.002
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The performance of a flow-through electrochemical cell with an yttria-stabilized zirconia (YSZ) sensor for pH measurement in high-temperature nickel laterite pressure acid leach (PAL) process solutions was evaluated. Very good agreement was observed between the measured pH values and those theoretically predicted using the OLI Systems software package calibrated independently based on solubility measurements. PAL process solutions were simplified to ternary MgSO4-Al-2(SO4)(3)-H2SO4 solutions by combining all the divalent metal sulphates into one with the properties of MgSO4. The experimental results support the postulation that the high-temperature behaviour of nickel, cobalt and manganese sulphates can be satisfactorily approximated with that of MgSO4. The experimental findings also support the postulation that acid should be added to a PAL process so that the solution pH is around 1 at the leach temperature, regardless of the feed composition. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：155 / 160
页数：6
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