Japanese Patent JPS5192800

A

1487902 Fe(OH) 3 , Fe 2 (SO 4 ) 3 and (NH 4 ) 2 SO 4 ; soil modifiers SOC ITALIANA RESINE SIR SpA 19 Dec 1975 [20 Dec 1974] 52172/75 Headings C1A and C1B A soil modifying composition and a concentrated (NH 4 ) 2 SO 4 solution are prepared from the solid by-products obtained in TiO 2 production from ilmenite or ilmenite slag by the sulphate process (a) contacting the by-product consisting essentially of FeSO 4 7H 2 O with gaseous NH 3 to obtain essentially (NH 4 ) 2 SO 4 and Fe(OH) 2 , (b) oxidizing the product of step (a) to obtain Fe(OH) 3 using O 2 or a molecular oxygen containing gas, (c) lixiviating the product of step (b) with water to remove 85 to 95 wt. per cent of the (NH 4 ) 2 SO 4 in the form of an aqueous solution having an average (NH 4 ) 2 SO 4 content of at least 40 wt. per cent and separating the solution from the residual solids, and, (d) drying the solids to a water content of <20% by wt. to obtain the soil modifier composition. Step (a) may be carried out at from 20‹ C. up to just below the melting point of FeSO 4 7H 2 O; under these conditions step (a) may be carried out simultaneously with step (b) in a single reaction stage. The dried residual solid step (d) may be treated with H 2 SO 4 to convert at least 5 mole per cent of Fe(OH) 3 on to the sulphate for use as soil modifier. Reference has been directed by the Comptroller to Specification 1,418,623.

JP4080798

Magnetic carrier for nucleic acid binding and its manufacturing method

JP15126175A

August 14, 1976

December 20, 1975

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C01G49/06; C01C1/24; C01C1/242; C01G49/00; C01G49/14; C05C3/00; C05D9/02; C09K17/00; C09K17/02; C09K101/00; (IPC1-7): A01N7/02; B01J1/00; C01C1/24; C01G49/06; C05C3/00; C05D9/02

DE2411011A1

1974-09-19

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