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Application

2003105503/15, 2003-02-25

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Start date

2003-02-25

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Actual filing date

2003-02-25

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Published

2004-12-27

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Inventor

Shchelkonogov A.A.Frejdlina R.G.Teterin V.V.Guljakin A.I.Saburov L.N.Kozlov Ju.A.Kochelaev V.A.Jakovleva S.A.Shirokov Ju.I.

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Holder

Otkrytoe Aktsionernoe Obshchestvo Nauchno-Issledovatel'Skij I Proektnyj Institut Titana I Magnija"Otkrytoe Aktsionernoe Obshchestvo

INTEGRATED SERPENTINITE PROCESSING METHOD RESULTING IN PURE SILICA PRODUCTION Russian patent published in 2004 - IPC

Abstract RU 2243154 C2

FIELD: industrial inorganic synthesis.

SUBSTANCE: invention comprises processing of serpentinite to produce following commercial products: pure silica, magnesium compounds, including magnesium chloride, magnesium metal, carnallite, iron- and nickel-containing concentrates. Serpentinite is leached with hydrochloric acid solution containing 10-21% HCl at 60-100^оС and liquid-to-solids ratio (3-10):1 for 2 to 6 h under discontinuous or continuous countercurrent conditions to yield magnesium chloride solution and silica. The former is purified via two-step neutralization: first with brucite or caustic magnesite at 80-90^оС to pH 3.5-4.0 and then with sodium hydroxide solution to pH 6-7 including addition of sodium sulfide or hydrosulfide.

EFFECT: increased purity of silica product and enlarged number of commercial products and/or semiproducts.

4 cl

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RU 2 243 154 C2

Authors

Shchelkonogov A.A.

Frejdlina R.G.

Teterin V.V.

Guljakin A.I.

Saburov L.N.

Kozlov Ju.A.

Kochelaev V.A.

Jakovleva S.A.

Shirokov Ju.I.

Dates

2004-12-27—Published

2003-02-25—Filed