氯化钠对氧化镁水化产品形貌的影响

发布时间：2018-05-15 22:41

  本文选题：一维状氢氧化镁 + 氧化镁　； 参考：《金属矿山》2017年04期

【摘要】：为考察以NaCl为晶型诱导剂,常压下水化反应制备一维状氢氧化镁的可行性,以六水氯化镁低温煅烧生成的活性氧化镁为原料,常压下水化合成氢氧化镁。结果表明:NaCl浓度为0.034 mol/L时,水化反应产品主要呈片状;NaCl浓度为0.171 mol/L时,水化产品呈槽沿的凹槽状;NaCl浓度为0.342 mol/L时,形成半管状产品,且分散性较好。即随着NaCl浓度的提高,水化产品逐渐向一维状趋势发展。当NaCl浓度较低时,新生成的氢氧化镁只能任意吸附在已生成的氢氧化镁晶体上,生成分散性较好的规则片状氢氧化镁;当NaCl浓度较高时,NaCl能够选择性地吸附在氢氧化镁的特定晶面上,使片状颗粒沿着垂直的晶面优先生长,最终发生定向排列形成槽状;随着NaCl浓度的进一步提高,Na~+易于扩散到[Mg(OH)_6]~(4-)八面体中,取代部分Mg~(2+)的位置,降低氢氧化镁生长的梯度能量,进而改变氢氧化镁晶体在不同方向的生长速率,有利于诱导晶体沿一维方向生长,可快速诱导生成一维管状产品。
[Abstract]:In order to investigate the feasibility of the preparation of one dimensional magnesium hydroxide with NaCl as the inducer, the hydrated magnesium hydroxide was prepared at low temperature by six water magnesium chloride at low temperature. The results showed that the hydration reaction products were mainly flaky when the concentration of NaCl was 0.034 mol/L, and the concentration of NaCl was 0.171 mol/L, When the concentration of NaCl is 0.342 mol/L, a semi tubular product is formed and the dispersibility is better. That is, with the increase of NaCl concentration, the hydrated product gradually develops to one dimension trend. When the concentration of NaCl is low, the newly generated magnesium hydroxide can only be adsorbed on the generated magnesium hydroxide crystal and produce better dispersibility. When the concentration of NaCl is high, NaCl can selectively adsorb on the specific crystal surface of magnesium hydroxide, so that the flake particles grow along the vertical crystal surface first and eventually form the groove shape. With the further increase of NaCl concentration, Na~+ is easily diffused into the [Mg (OH) _6]~ (4-) eight surface, replacing some Mg~ (2+). In order to induce the growth of magnesium hydroxide, the growth rate of magnesium hydroxide in different directions is changed and the growth rate of magnesium hydroxide crystals in different directions is changed, which can induce the growth of the crystal along the one-dimensional direction, which can quickly induce the production of one dimensional tubular product.

【作者单位】： 华北理工大学矿业工程学院;万宝矿产有限公司;
【基金】：国家自然科学基金项目(编号:51504078) 河北省自然科学基金项目(编号:E2015209210) 大学生创新基金项目(编号:X2016134)
【分类号】：TQ132.2
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本文编号：1894291