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A new process of acidic hydrolysis of residual chlorosilane liquid for the preparation of silica and hydrochloric acid

  • Materials (Organic, Inorganic, Electronic, Thin Films)
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Abstract

We propose a novel process for the preparation of silica and concentrated hydrochloric acid using chlorosilane residual liquid originating from the polysilicon production process. The process was designed and optimized after conducting pilot plant tests. The effects of circulating acid concentration, flow rate, chlorosilane residual liquid treatment load and other factors on silica products were studied. The results showed that the circulating acid flowrate can effectively control the formation of gel, and the amount of chlorosilane residual liquid has significant influence on the hydrolysis efficiency and operation of the hydrolysis tower. The prepared silica was characterized using XRD, XRF, FT-IR, SEM, DLS, TG-MS and N2 adsorption/desorption experiments. The results indicated that silica consisted of amorphous particles, which were spherical, had surface hydroxyl, and showed heterogeneous distribution. The average particle size was 50-80 μm and had high specific surface area (565.049 m2g−1), large pore volume (0.449 cm3g−1), and a narrow pore size distribution (3.419 nm). The new technology provides a simple, efficient and environmentally friendly way for treating chlorosilane residual liquid, as well as a cost-effective method for the preparation of silica.

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Authors and Affiliations

  1. The Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China

    Jixiang Cai, Bing Huang & Wenwen Zhang

  2. Kunming Metallurgical Institute New Materials Co., Ltd., Kunming, Yunnan, China

    Qikun Ma

Authors
  1. Jixiang Cai
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  2. Bing Huang
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  3. Qikun Ma
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  4. Wenwen Zhang
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Correspondence to Bing Huang.

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Cai, J., Huang, B., Ma, Q. et al. A new process of acidic hydrolysis of residual chlorosilane liquid for the preparation of silica and hydrochloric acid. Korean J. Chem. Eng. 34, 1793–1800 (2017). https://doi.org/10.1007/s11814-017-0093-2

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  • DOI: https://doi.org/10.1007/s11814-017-0093-2

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