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- W2381228298 abstract "Using Zhejiang Shengzhou diatomite as raw material,the silica was prepared via high temperature alkali dissolution,acidification,filtration,desiccation and purification. The effects of the quantity ratio of diatomite to NaOH,calcination temperature and time on the digestion ratio of SiO2 were investigated by means of using orthogonal experiments methods. Moreover,the amount of SiO2 and Fe in silica samples was characterized by hydrofluoric acid volatilization method and phenanthroline spectrophotometry,respectively. It was found that the whiteness of samples is increased after chloridizing calcination. The optimal technological conditions were obtained as following:the quantity ratio of diatomite to NaOH is 1:1,the calcination temperature is 450℃ and the calcination time is 1 h. Under above technological conditions,the digestion rate of SiO2 is 75.5%. After chloridizing calcination,the waste residue is effectively removed,and thus the whiteness of the product is increased. The SiO2 content in the precipitated silica product is 91.9%. This study provides an availability approach for the utilization of Zhejiang Shengzhou diatomite." @default.
- W2381228298 created "2016-06-24" @default.
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- W2381228298 date "2009-01-01" @default.
- W2381228298 modified "2023-09-23" @default.
- W2381228298 title "Preparation of Silica by High Temperature Alkali Dissolution from Zhejiang Shengzhou Diatomite" @default.
- W2381228298 hasPublicationYear "2009" @default.
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