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利用激光测量装置测定了H3BO3在不同浓度的MgCl2和NaCl溶液中的溶解度和超溶解度,得到了H3BO3在上述溶液中的介稳区宽度,推算出H3BO3的成核级数m.实验结果表明:H3BO3的介稳区宽度在高温区狭窄而在低温区较宽;与H3BO3在纯水中的溶解度相比,MgCl2和NaCl均能降低H3BO3在水中的溶解度,尤以MgCl2为甚,且随着二者浓度的升高,介稳区先变窄最后变宽.MgCl2对H3BO3的表观成核级数影响较大,NaCl对其影响较小;在MgCl2中等浓度和NaCl较低浓度下,成核级数小,有利于晶体的生长,在该区域可获得较大粒度的晶粒.
The solubility and super-solubility of H3BO3 in different concentrations of MgCl2 and NaCl solution were measured by laser measuring device, the metastable region width of H3BO3 was obtained and the nucleation degree of H3BO3 was deduced.The experimental results show that H3BO3 The width of metastable zone is narrow at high temperature and wide at low temperature. Compared with the solubility of H3BO3 in pure water, MgCl2 and NaCl can reduce the solubility of H3BO3 in water, especially MgCl2, The metastable region first narrows and finally broadens.MgCl2 has a significant effect on the apparent nucleation series of H3BO3, but NaCl has little effect on it. Under the medium concentration of MgCl2 and the lower concentration of NaCl, Small number is conducive to the growth of the crystal, in this region can get larger grain size.