中南大学学报（自然科学版）2016，Vol.47Issue(7)：2196-2204,9.DOI:10.11817/j.issn.1672-7207.2016.07.003
大洋多金属结核高压低质量分数碱浸过程中SiO2溶出行为
Dissolving behavior of silica of ocean polymetallic nodules in low mass fraction of alkali leaching under high pressure
摘要
Abstract
In order to improve the comprehensive utilization, an alkali leaching pretreatment of ocean polymetallic nodules was studied. The effects of initial mass fraction of NaOH, leaching temperature, mass ratio of liquid-to-solid, leaching time, and the pressure leaching kinetic on the dissolution of silica were investigated during the low mass fraction of alkali leaching process of ocean polymetallic nodules with low mass fraction of NaOH solution under high pressure. And the high pressure alkali leaching kinetics of desilication was also investigated. The results show that the mass concentration of Na2SiO3 in the leachate reaches 118.51 g/L with the leaching temperature of 180 oC, the mass fraction NaOH of 10%, the liquid-to-solid mass ratio of 3.0:1.0 and the leaching time of 70 min, and the rest of Na2SiO3 changes to analcime Na(Si2Al)O6·H2O. The apparent activation energy of SiO2 in the high pressure leaching reaction is 50.08 kJ/mol, which follows the shrinking core model with surface chemical reaction control. Through the low mass fraction of alkali leaching with high pressure leaching, SiO2 can be selectively leached by the leaching process with low mass fraction of NaOH solution under high pressure, while analcime with high adsorption property can be produced. At the same time, the lattice structures of useful metal elements will not be damaged, and the mass fraction of Mn of residue reaches above 30.72%.关键词
大洋多金属结核/SiO2/低质量分数碱浸/高压浸出Key words
ocean polymetallic nodules/SiO2/low mass fraction of alkali leaching/pressure leaching分类
矿业与冶金引用本文复制引用
冯雅丽,刘鹏伟,李浩然,郭成林,吴梦妮,李洪珊,袁飞..大洋多金属结核高压低质量分数碱浸过程中SiO2溶出行为[J].中南大学学报（自然科学版）,2016,47(7):2196-2204,9.基金项目
水体污染与治理科技重大专项(2015ZX07205-003)；中国大洋矿产资源研究计划项目(DY125-15-T-08)；国家自然科学基金资助项目(21176026，21176242)(Project(2015ZX07205-003) supported by the Major Science and Technology Program for Water Pollution Control and Treatment （2015ZX07205-003）
Project(DY125-15-T-08) supported by the China Ocean Mineral Resources Research & Development Program （DY125-15-T-08）
Projects(21176026,21176242) supported by the National Natural Science Foundation of China) （21176026,21176242）
