Method for production of iron ioxide pigments
AssigneeBiopigment Ltd.
InventorsVladimir Boiko, Marlen Oryol, Boris Oryol
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Abstract
The invention provides a process for the production of iron based pigments and anticorrosive additives from elemental iron comprising: a) reacting iron Fe° with ferric sulphate Fe2(SO4)3 and with sulfuric acid H2SO4 to produce ferrous sulphate FeSO4; b) oxidizing ferrous sulphate FeSO4 in a bacterial solution containing at 107 bactrial cells of thiobacillus ferrooxidans per 1 ml of solution under aerobic conditions to produce ferric oxide sulphate Fe2(SO4)3; c) reacting said ferric oxide sulphate Fe2(SO4)3 with water, to precipitate iron oxide monohydrate Fe2O3×H2O; and d) re-cycling the solution from step c, to step a, to utilize the sulphuric acid and a portion of the ferruos sulphate values therein.
Claims9
A process for the production of iron based pigments and anticorrosive additives from elemental iron comprising:
- a) reacting iron Fe° with ferric sulphate Fe2(SO4)3 and with sulfuric acid H2SO4 to produce ferrous sulphate FeSO4;
- b) oxidizing ferrous sulphate FeSO4 in a bacterial solution containing at least 107 bacterial cells of thiobacillus ferrooxidans per 1 ml of solution under aerobic conditions to produce ferric oxide sulphate Fe2(SO4)3;
- c) reacting said ferric sulphate Fe2(SO4)3 with water at a temperature of about 65 to 130° C., to precipitate iron oxide monohydrate Fe2O3×H2O;
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- d) re-cycling the solution from step c, to step a, to utilize the sulphuric acid and a portion of the ferrous sulphate values therein.
A process for the production of iron based pigments and anticorrosive additives from elemental iron comprising:
- a) reacting iron Fe° with ferric sulphate Fe2(SO4)3 and with sulfuric acid H2SO4 to produce ferrous sulphate FeSO4:
- b) oxidizing ferrous sulphate FeSO4 in a bacterial solution containing sulfuric acid and at least 107 bacterial cells of thiobacillus ferrooxidans per 1 ml of solution under aerobic conditions to produce ferric sulphate Fe2(SO4)3;
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- c) reacting said ferric sulphate Fe2(SO4)3 with potassium dihydrogen phosphate (KH2PO4) to produce a white anticorrosive additive of the formula Fe(H2PO4)3.
Dependencies are inferred from the claim text.