镁浸出与CO2矿化形成不同形态的水合MgCO3

Jacob Rubel , Joren De Brabander , Dharmjeet Madhav , Yukun Ji , Veerle Vandeginste
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引用次数: 0

摘要

本研究研究了一种常见的采矿废弃物—坚岩浆料的浸出和提纯工艺,以及二氧化碳矿化的碳酸化工艺。结果表明,HCl是一种很有前景的浸出剂,pH和温度是控制浸出效率的主要因素,在75℃条件下,2m HCl溶液浸出4 h,浸出率达到82%。通过氢氧化铵对渗滤液进行净化,对其他离子如、、的去除效果也较好,在初始浓度分别为3.10 g/L和0.40 g/L的渗滤液中,铁和铝均被完全去除。用纯化的渗滤液和纯MgCl2水溶液研究了镁在室温下的碳酸化反应。在1.5 h后开始形成尼斯孔石晶体,转化为尼斯孔石的转化率约为5%。所产生的晶体具有针状形状,可以使用生物聚合物果胶和黄原胶进行修饰。果胶对结晶长度的影响有限,随着果胶浓度的增加,针尖长度减少。另一方面,随着黄原胶的加入,针状结构被缩短和拓宽,形成柱状结构。这项研究证明了这一过程利用采矿废物和隔离二氧化碳的潜力,并在此过程中产生有用的矿物产品。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Magnesium leaching from dunite slurry and CO2 mineralization to form hydrated MgCO3 with different morphologies

Magnesium leaching from dunite slurry and CO2 mineralization to form hydrated MgCO3 with different morphologies
This study investigates the leaching and purification processes for dunite slurry, a common mining waste material, and the carbonation processes for the mineralization of CO2 with
. Results indicate that HCl is a promising leaching agent, and pH and temperature are major factors in controlling the efficiency of the leaching process, with leaching efficiencies of 82% achieved after 4 h using 2 M HCl solution at 75 °C. The removal of other ions like
,
, and
through the purification of the leachate using ammonium hydroxide was also proven to be effective, completely removing iron and aluminum from the leachate from starting concentrations of 3.10 and 0.40 g/L, respectively. The carbonation of magnesium at room temperature was investigated with both purified leachate and pure MgCl2 aqueous solution. Nesquehonite crystals began to form after 1.5 h with a conversion of
to nesquehonite of approximately 5%. The produced crystals possess a needle-like shape, which could be modified using the biopolymers pectin and xanthan. Pectin had a limited influence on the length of the crystals, reducing the needle length with increasing pectin concentration. Xanthan, on the other hand, shortened and widened the needle-like structure into a column shape as more xanthan was added. This study demonstrates the potential for this process to utilize mining wastes and sequester CO2, producing useful mineral products in the process.
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