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Method both for preparation of iron oxide black and combined production of ammonium sulfate

A technology of iron oxide black and ammonium sulfate, applied in chemical instruments and methods, oxides of ferrous iron, iron oxide/iron hydroxide, etc., can solve the problem of poor tinting strength, long oxidation time and many by-products of iron oxide black and other problems, to achieve the effects of easy recycling, high processing costs, and environmental pollution problems

Active Publication Date: 2014-10-01
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that there are problems of long oxidation time and many by-products in the preparation of iron oxide black in the prior art, resulting in poor tinting strength of iron oxide black, and then providing a method of replacing oxygen-containing iron oxide with amorphous iron oxyhydroxide The method for preparing iron oxide black using body as addition raw material

Method used

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  • Method both for preparation of iron oxide black and combined production of ammonium sulfate
  • Method both for preparation of iron oxide black and combined production of ammonium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Mix 1.0kg of ferrous sulfate heptahydrate and 0.6kg of ammonium bicarbonate evenly, and knead at 20°C to complete the reaction;

[0025] (2) adding a certain amount of water to the reacted product in the step (1) to obtain a slurry with a concentration of 90 g / L;

[0026] (3) Introduce air into the slurry in step (2) at a rate of 6 L per minute, control the pH of the reaction system to 6.5 with ammonia water at a concentration of 22 wt%, and carry out the oxidation reaction at a temperature of 20°C ;

[0027] (4) After heating the slurry after the oxidation reaction in step (3) to 60°C, add 0.5kg of ferrous sulfate heptahydrate and 2.2kg of ammonia water with a concentration of 15w% to the slurry to perform an addition dehydration reaction ;

[0028] (5) After the reaction is completed, filter to obtain a filtrate with an ammonium sulfate concentration of 16.6wt% and a filter cake. The filtrate is used to recover ammonium sulfate, and the filter cake is dried at 6...

Embodiment 2

[0030] (1) Mix 1.2kg of ferrous sulfate heptahydrate and 0.7kg of ammonium bicarbonate evenly, and knead at 25°C to complete the reaction;

[0031] (2) adding a certain amount of water to the reacted product in step (1) to obtain a slurry with a concentration of 120 g / L;

[0032] (3) Introduce air into the slurry in step (2) at a rate of 7 L per minute, control the pH value of the reaction system to 7.0 with ammonia water with a concentration of 15 wt%, and carry out the oxidation reaction at a temperature of 25°C ;

[0033] (4) After the oxidation reaction slurry in the step (3) is heated to 65° C., 0.6 kg of ferrous sulfate heptahydrate and 3 kg of ammonia water with a concentration of 17 wt % are added to the slurry to perform an addition dehydration reaction;

[0034] (5) After the reaction is completed, filter to obtain a filtrate with an ammonium sulfate concentration of 15.5wt% and a filter cake. The filtrate is used to recover ammonium sulfate, and the filter cake is ...

Embodiment 3

[0036] (1) Mix 1.4kg of ferrous sulfate heptahydrate and 0.75kg of ammonium bicarbonate evenly, and knead at 30°C to complete the reaction;

[0037] (2) adding a certain amount of water to the reacted product in step (1) to obtain a slurry with a concentration of 140 g / L;

[0038] (3) Introduce air into the slurry in the step (2) at a rate of 8 L per minute, control the pH value of the reaction system to 7.5 with ammonia water with a concentration of 28 wt%, and carry out the oxidation reaction at a temperature of 30°C ;

[0039] (4) After the oxidation reaction slurry in the step (3) is heated to 70° C., 0.7 kg of ferrous sulfate heptahydrate and 3 kg of ammonia water with a concentration of 21 wt % are added to the slurry to perform an addition dehydration reaction;

[0040] (5) After the reaction is completed, filter to obtain a filtrate with an ammonium sulfate concentration of 17wt% and a filter cake. The filtrate is used to recover ammonium sulfate, and the filter cake ...

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Abstract

The invention provides a method both for preparation of iron oxide black and combined production of ammonium sulfate, which belongs to the field of preparation of pigments. The method comprises the following steps: (1) uniformly mixing ferrous sulfate with ammonium bicarbonate and carrying out kneading at 20 to 50 DEG C so as to complete a reaction; (2) adding a certain amount of water into a reacted product obtained in the step (1) so as to obtain slurry; (3) introducing oxygen-containing gas into the slurry prepared in the step (2) and carrying out an oxidation reaction under the conditions that a temperature is 20 to 60 DEG C and a pH value is 6.5 to 7.5; (4) heating the slurry having undergone the oxidation reaction in the step (3) to 60 to 90 DEG C, adding a certain amount of ferrous sulfate and ammonia water into the slurry and carrying out an addition dehydration reaction; and (5) after completion of the reaction, carrying out filtering, recovering ammonium sulfate from obtained filtrate and drying a filter cake so as to obtain a finished iron oxide black product. The iron oxide black prepared by using the method has the advantages of a single crystal structure, a small particle size, high purity and strong tinting strength.

Description

technical field [0001] The invention relates to a method for preparing iron oxide black that co-produces ammonium sulfate, and belongs to the field of pigment preparation. Background technique [0002] Iron oxide black is referred to as iron black for short, its molecular formula is Fe3O4, or Fe2O3·FeO, and its chemical name is ferric oxide. Iron oxide black has saturated blue ink black, high hiding power and tinting power, and is widely used in coloring fields such as building materials, cement, ink, printing, and plastics. In recent years, the demand for iron oxide black in my country has continued to increase, with an annual growth rate of 107%, far higher than the 36.6% growth rate of the entire iron oxide pigment, and is second only to iron red and iron yellow iron pigments. [0003] Many methods for preparing iron oxide black with co-production of ammonium sulfate have been disclosed in the prior art. For example, Chinese patent document CN1709985A discloses a method...

Claims

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Application Information

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IPC IPC(8): C01G49/08C01C1/247
Inventor 王立贤刘振义白洪彬周彤邱新荣杜娟樊俐
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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