Magnesium carbonate nesquehonite crystals were synthesized by mixing of the salt manufacturewastewater (bittern) and Na 2 CO 3 with molar ratio 1:1 at room temperature. The effect of pHrange (8-10) and initial magnesium concentration range (10,000-40,000 ppm) were investigated.Crystal morphology was observed using scanning electron microscopy and energy dispersiveX-ray spectroscopy confirmed with X-ray diffraction. Large changes in morphology wereobserved in the increasing of initial concentration, which strongly depend on the pH. With anincrease of pH, magnesium carbonate nesquehonite crystals change to hydromagnesite.However, reaction crystallization with initial magnesium concentration 40,000 ppm is found donot produce magnesium carbonate hydrated. Crystallization of magnesium carbonatenesquehonite is favored in the pH 8-9 with initial concentration in 10,000-20,000 ppm.
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机译：通过在室温下以1：1的摩尔比混合制盐废水（卤水）和Na 2 CO 3来合成碳酸镁水镁石晶体。研究了pH范围（8-10）和初始镁浓度范围（10,000-40,000 ppm）的影响。使用扫描电子显微镜观察晶体形貌，并通过X射线衍射确认能量色散X射线光谱。随着初始浓度的增加，观察到形态学上的很大变化，这在很大程度上取决于pH。随着pH值的增加，碳酸镁水镁石晶体变为菱镁矿，但发现初始镁浓度为40,000 ppm的反应结晶不会产生水合碳酸镁。 pH值8-9有利于碳酸镁水榴石的结晶，其初始浓度为10,000-20,000 ppm。
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