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Preparation method of periclase-forsterite gradient composite hollow spheres
The invention relates to a preparation method of periclase-forsterite gradient composite hollow spheres, and belongs to the field of alkaline heat insulation refractory materials. The preparation method comprises the following steps: proportioning 75-95wt% of magnesium-rich silicate mineral, 1-10wt% of light-burned magnesia and 1-15wt% of natural quartz, grinding into fine powder, adding a binding agent which accounts for 4-6wt% of the sum of the percentages of the raw materials, mixing, and granulating; secondly, the spherical particles obtained through granulation in the first step serve as cores, 10-30 wt% of light-burned magnesia is wrapped, and heterogeneous spherical particle green bodies with the interior rich in SiO2 are obtained; and finally, firing the coated spherical particles at high temperature, and cooling to obtain the gradient composite hollow sphere. A wrapping compounding-in-situ diffusion reaction pore-forming process is adopted, a diffusion reaction path is regulated and controlled through the composition of a heterogeneous sphere, so that a hollow structure is formed in situ, a shell of the hollow sphere is mainly composed of a periclase phase, forsterite phases on the surface of the shell are gradually increased inwards, and a spherical shell structure with the periclase-forsterite phases in gradient distribution is formed.
本发明涉及一种方镁石‑镁橄榄石梯度复合空心球的制备方法，属于碱性隔热耐火材料领域。该制备方法包括以下步骤：按照质量百分比75~95wt%的富镁硅酸盐矿物、1~10wt%的轻烧镁砂，1~15wt%的天然石英配比，磨成细粉，外加上述原料百分比之和4~6wt%的结合剂混炼，造粒；然后，以步骤1中造粒得到的球形颗粒为核，包裹10~30wt%的轻烧镁砂，得到内部富SiO2的非均质球形颗粒坯体；最后，将包覆的球形颗粒进行高温烧制，冷却后即得梯度复合空心球。本发明采用包裹复合‑原位扩散反应成孔工艺，通过非均质球的组成调控扩散反应路径，从而原位形成空心结构，该空心球的外壳以方镁石相为主，球壳表面向内镁橄榄石相逐渐增多，形成方镁石‑镁橄榄石相呈梯度分布的球壳结构。
Preparation method of periclase-forsterite gradient composite hollow spheres
The invention relates to a preparation method of periclase-forsterite gradient composite hollow spheres, and belongs to the field of alkaline heat insulation refractory materials. The preparation method comprises the following steps: proportioning 75-95wt% of magnesium-rich silicate mineral, 1-10wt% of light-burned magnesia and 1-15wt% of natural quartz, grinding into fine powder, adding a binding agent which accounts for 4-6wt% of the sum of the percentages of the raw materials, mixing, and granulating; secondly, the spherical particles obtained through granulation in the first step serve as cores, 10-30 wt% of light-burned magnesia is wrapped, and heterogeneous spherical particle green bodies with the interior rich in SiO2 are obtained; and finally, firing the coated spherical particles at high temperature, and cooling to obtain the gradient composite hollow sphere. A wrapping compounding-in-situ diffusion reaction pore-forming process is adopted, a diffusion reaction path is regulated and controlled through the composition of a heterogeneous sphere, so that a hollow structure is formed in situ, a shell of the hollow sphere is mainly composed of a periclase phase, forsterite phases on the surface of the shell are gradually increased inwards, and a spherical shell structure with the periclase-forsterite phases in gradient distribution is formed.
本发明涉及一种方镁石‑镁橄榄石梯度复合空心球的制备方法，属于碱性隔热耐火材料领域。该制备方法包括以下步骤：按照质量百分比75~95wt%的富镁硅酸盐矿物、1~10wt%的轻烧镁砂，1~15wt%的天然石英配比，磨成细粉，外加上述原料百分比之和4~6wt%的结合剂混炼，造粒；然后，以步骤1中造粒得到的球形颗粒为核，包裹10~30wt%的轻烧镁砂，得到内部富SiO2的非均质球形颗粒坯体；最后，将包覆的球形颗粒进行高温烧制，冷却后即得梯度复合空心球。本发明采用包裹复合‑原位扩散反应成孔工艺，通过非均质球的组成调控扩散反应路径，从而原位形成空心结构，该空心球的外壳以方镁石相为主，球壳表面向内镁橄榄石相逐渐增多，形成方镁石‑镁橄榄石相呈梯度分布的球壳结构。
Preparation method of periclase-forsterite gradient composite hollow spheres
一种方镁石-镁橄榄石梯度复合空心球的制备方法
ZHAO FEI (author) / HUANG ZHENNI (author) / HU YANG (author) / REN PENGSHUAI (author) / ZHOU CHAOJIE (author) / LIU XINHONG (author) / MA CHENGLIANG (author)
2024-04-05
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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