A process for preparing high specific surface iron oxyhydroxide and co-producing ammonium sulfate

A technology of iron oxyhydroxide and high specific surface, applied in iron oxide/iron hydroxide, oxidized water/sewage treatment, ammonia compounds, etc., can solve the problems of small specific surface area of ​​iron oxyhydroxide, cumbersome ammonium sulfate recovery process, etc., to achieve The effects of large specific surface area, strong oxidation capacity, and strong adsorption capacity

Active Publication Date: 2018-05-18
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects that the specific surface area of ​​iron oxyhydroxide is small and the recycling process of ammonium sulfate exists in the existing technology of preparing amorphous iron oxyhydroxide and co-producing ammonium sulfate, and then provide a kind of A process that can directly and easily recover ammonium sulfate while preparing high specific surface iron oxyhydroxide

Method used

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  • A process for preparing high specific surface iron oxyhydroxide and co-producing ammonium sulfate
  • A process for preparing high specific surface iron oxyhydroxide and co-producing ammonium sulfate
  • A process for preparing high specific surface iron oxyhydroxide and co-producing ammonium sulfate

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Embodiment 1

[0028] This embodiment provides a process for preparing high specific surface iron oxyhydroxide and co-producing ammonium sulfate, comprising the following steps:

[0029] (1) Mix ferrous sulfate heptahydrate solid and ammonium carbonate solid with a molar ratio of 1:1.2 at 25°C, and add a certain amount of water to form a slurry during the kneading process, and control the density of the slurry during the kneading process. The pH value is 6.5-6.8, and the pH value of the slurry at the end of the kneading is 7.5-8;

[0030] (2) carry out solid-liquid separation to the described slurry that step (1) obtains, collect solid phase and liquid phase respectively, described liquid phase is evaporated to dryness promptly to obtain ammonium sulfate;

[0031] (3) Use water to make the solid phase into a slurry with a concentration of 15wt%, add 30wt% hydrogen peroxide to the slurry and control the molar ratio of hydrogen peroxide to ferrous sulfate to be 1:2 to have an oxidation reactio...

Embodiment 2

[0035] This embodiment provides a process for preparing high specific surface iron oxyhydroxide and co-producing ammonium sulfate, comprising the following steps:

[0036] (1) Mix ferrous sulfate heptahydrate solid and ammonium carbonate solid with a molar ratio of 1:1 at 20°C, and add a certain amount of water to form a slurry during the kneading process, and control the density of the slurry during the kneading process. The pH value is 6.7-7, and the pH value of the slurry at the end of kneading is 7.5-7.8;

[0037] (2) carry out solid-liquid separation to the described slurry that step (1) obtains, collect solid phase and liquid phase respectively, described liquid phase is evaporated to dryness promptly to obtain ammonium sulfate;

[0038] (3) adopting water to make the solid phase into a slurry with a concentration of 10wt%, adding 40wt% hydrogen peroxide to the slurry and controlling the mol ratio of hydrogen peroxide to ferrous sulfate to be 1.1:2 to have an oxidation r...

Embodiment 3

[0041] This embodiment provides a process for preparing high specific surface iron oxyhydroxide and co-producing ammonium sulfate, comprising the following steps:

[0042] (1) Mix ferrous sulfate heptahydrate solid and ammonium carbonate solid with a molar ratio of 1:1.1 at 30°C, and add a certain amount of water to form a slurry during the kneading process, and control the density of the slurry during the kneading process. The pH value is 6.6-6.9, and the pH value of the slurry at the end of the kneading is 7.6-8;

[0043] (2) carry out solid-liquid separation to the described slurry that step (1) obtains, collect solid phase and liquid phase respectively, described liquid phase is evaporated to dryness promptly to obtain ammonium sulfate;

[0044](3) Adopting water to make the solid phase into a slurry with a concentration of 20wt%, adding 50wt% hydrogen peroxide to the slurry and controlling the mol ratio of hydrogen peroxide to ferrous sulfate to be 1.05:2 to have an oxida...

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Abstract

The invention provides a technology for preparing iron hydroxide with a high specific surface area and cooperatively producing ammonium sulfate. The technology includes mixing and kneading solid ferrous sulfate, solid ammonium carbonate and / or solid ammonium bicarbonate which are used as raw materials, adding water into the raw materials in mixing and kneading procedures to form slurry and controlling a pH (potential of hydrogen) value of the slurry so that the pH value of the slurry is 6.5-7 in the mixing and kneading procedures and is 7-8 when the raw materials are completely mixed and kneaded; separating solid from liquid in the slurry, respectively collecting solid phases and liquid phases and drying the liquid phases by means of distillation to obtain the ammonium sulfate; preparing serous fluid from the solid phases by the aid of water, adding hydrogen peroxide into the serous fluid to carry out oxidation reaction to obtain products and filtering the products after the reaction is completely carried out to obtain filter cake which is the iron hydroxide. The technology has the advantages that green rust which is an intermediate product is oxidized by the aid of the hydrogen peroxide, and accordingly a final product is assuredly the amorphous iron hydroxide; the iron hydroxide prepared by the aid of the technology has the large specific surface area, is high in oxidation capacity and accordingly can be widely applied to the field of gas purification and sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and gas purification, and in particular relates to a process for preparing high specific surface iron oxyhydroxide and co-producing ammonium sulfate. Background technique [0002] As an important industrial material, iron oxyhydroxide has a wide range of applications, and can be used as a precursor of pigments, magnetic coatings, magnetic recording media, gas sensors, desulfurizers, ozonolysis catalysts, heavy metal removers, etc., thereby promoting More and more research is devoted to the field of production process of iron oxyhydroxide. It has been found through research that there is a close relationship between the structure and properties of iron oxyhydroxide and its preparation methods, and different preparation methods will yield iron oxyhydroxides with different crystal forms, morphologies and characteristics. [0003] For example, Chinese patent document CN103991909A discloses a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/244C01G49/02C02F1/72C02F103/28
CPCC01C1/244C01G49/02C01P2002/72C01P2006/12C02F1/72C02F2103/28
Inventor 王立贤
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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