首页|采用沉淀-煅烧法回收盐湖卤水中镁资源制备镁橄榄石耐火材料

采用沉淀-煅烧法回收盐湖卤水中镁资源制备镁橄榄石耐火材料

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通过沉淀-煅烧法研究盐湖锂镁分离和镁资源制备高附加值的镁橄榄石耐火材料.采用Na2SiO3和NaOH组合沉淀剂将盐湖卤水中的锂、镁离子沉淀分离,获得不同MgO/SiO2摩尔比的镁沉淀物.镁沉淀物主要由无定形硅酸镁和氢氧化镁堆积而成,在1400 ℃条件下的质量残留率均在62％以上.高温烧结实验表明,在Mg/Na2SiO3/NaOH的摩尔比为1∶0.6∶0.8、烧结温度为1350 ℃、时间为210 min的条件下,镁沉淀物可制备成性能优良的耐火材料,其耐火度在1800 ℃以上,抗压强度为190.73 MPa,体积密度为2.53 g/cm3,显气孔率为5.94％.所制备的耐火材料主要为镁橄榄石相,含有少量的顽火辉石相.
Mg recovery from salt lake brine into forsterite refractory materials via precipitation-calcination process
Li/Mg separation and magnesium recovery as a high-value forsterite refractory material from the salt lake were investigated via the precipitation-calcination process.The combined Na2SiO3 and NaOH precipitants were applied for Li/Mg precipitation separation from salt lake brine and magnesium precipitates could be produced with various MgO/SiO2 molar ratios.It is demonstrated that the magnesium precipitates were mainly composed of accumulative amorphous magnesium silicate and magnesium hydroxide,with more than 62％of mass residual at 1400 ℃.The high-temperature sintering experiments showed that when the Mg/Na2SiO3/NaOH molar ratio was 1∶0.6∶0.8,the magnesium precipitates could be prepared into a high-quality refractory material under the conditions of 1350 ℃ and 210 min,with the refractoriness of higher than 1800 ℃,compressive strength of 190.73 MPa,bulk density of 2.53 g/cm3,and apparent porosity of 5.94％.The prepared refractory materials mainly contained forsterite,with a minor enstatite phase.

salt lake brinecombined precipitantsLi/Mg precipitation separationmagnesium precipitatesforsterite refractory material

张烨、胡岳华、王丽、孙伟

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华东理工大学化工学院国家盐湖资源综合利用工程技术研究中心,上海 200237

中南大学资源加工与生物工程学院战略含钙矿物资源清洁高效利用湖南省重点实验室,长沙 410083

盐湖卤水 组合沉淀剂 锂镁沉淀分离 镁沉淀物 镁橄榄石耐火材料

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Hunan Province,ChinaNatural Science Foundation of Hunan Province,ChinaInnovationdriven Project of Central South University,ChinaNational"111"Project of ChinaKey Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calciumcontaining Mineral Resources,ChinaYoung Elite Scientists Sponsorship Program by CAST,China

5220426851974365919622232020JJ57472020JJ57492020CX039B140342018TP10022019QNRC001

2024

10.1016/S1003-6326(23)66428-3

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(2)