Characterization of solids obtained from calcium and magnesium precipitation by sodium carbonate addition

IF 0.8 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Sandra Daniela Ojeda Villegas, Alejandro Uribe Salas, Martha Araceli Elizondo Álvarez
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引用次数: 0

Abstract

The addition of sodium carbonate (Na2CO3) to the flotation water of complex sulfide ores is a strategy implemented to mitigate the adverse effect of calcium and magnesium present in the process water of complex sulfide flotation. These contaminating agents are due to the use of lime as pH regulator and to the presence in the ore of magnesium species. Na2CO3 is added with the aim of precipitating Ca2+ and Mg2+ as carbonates. In the case of calcium, it precipitates CaCO3, which has been identified by XRD as calcite and vaterite. In the case of magnesium, the precipitating solid is of amorphous nature. In order to identify the chemical nature of magnesium precipitates, thermogravimetric analysis was carried out. Additionally, the solids were analyzed by SEM–EDS to support the observations. The results suggest that the amorphous solid may consist of a hydrated basic magnesium carbonate, precursor of hydromagnesite (Mg5(CO3)4(OH)2·4H2O). Graphical abstract
通过添加碳酸钠沉淀钙和镁得到的固体的表征
在复杂硫化物矿石的浮选水中添加碳酸钠(Na2CO3)是一种策略,旨在减轻复杂硫化物浮选工艺水中存在的钙和镁的不利影响。造成这些污染的原因是使用石灰作为 pH 值调节剂,以及矿石中存在镁元素。加入 Na2CO3 的目的是使 Ca2+ 和 Mg2+ 以碳酸盐形式沉淀。就钙而言,它沉淀出 CaCO3,经 XRD 鉴定为方解石和辉石。至于镁,析出的固体是无定形的。为了确定镁沉淀物的化学性质,进行了热重分析。此外,还对固体进行了扫描电镜-电子显微镜分析,以支持观察结果。结果表明,无定形固体可能由水合碱式碳酸镁组成,是水镁石(Mg5(CO3)4(OH)2-4H2O)的前体。图表摘要
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来源期刊
MRS Advances
MRS Advances MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
1.50
自引率
0.00%
发文量
184
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