出版社：Thai Society of Higher Eduction Institutes on Environment
摘要：Magnesium carbonate nesquehonite crystals were synthesized by mixing of the salt manufacturewastewater (bittern) and Na2CO3 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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