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Preparation method and application for iron oxyhydroxide

An iron oxyhydroxide, reaction technology, applied in chemical instruments and methods, iron oxide/iron hydroxide, metal/metal oxide/metal hydroxide catalyst, etc. Uniform, large particle size and other problems, to achieve the effect of inhibiting the growth of crystal nucleus, shortening the contact time, and uniform particle size distribution

Active Publication Date: 2018-06-01
FUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects that the preparation process of ferric hydroxyhydroxide in the prior art cannot be continuously produced, the particle size distribution of the product is uneven, the particle size is large, and the specific surface area is low, thereby providing a continuous production Preparation method and application of ferric oxyhydroxide with high specific surface area

Method used

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  • Preparation method and application for iron oxyhydroxide

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Embodiment 1

[0028] Configure 0.5mol / L FeCl 2 solution and 2.0mol / L NaOH solution. A rotating packed bed supergravity reactor using wire mesh as filler, with a rotational speed of 1000 revolutions per minute. Oxygen-containing gas is sprayed into the rotating bed from the bottom of the reactor through a gas distributor. Regulated Fe 2+ The relative flow of the solution and the lye is such that the pH of the slurry at the outlet of the reactor is 9.0. The outlet slurry is pumped into the aging tank via a sampling pump. The heating temperature of the aging tank is 20°C, stirring, bubbling and oxidation with oxygen-containing gas, and the aging time is 30 minutes. After aging, the slurry was subjected to routine operations such as separation, washing, and drying to obtain sample A.

Embodiment 2

[0030] Configure 1.0mol / L FeSO 4 solution and 2.8mol / L NaCO 3 and NaHCO 3 Mixed alkaline solution in which NaCO 3 and NaHCO 3 The molar ratio is 1:1. A rotating packed bed supergravity reactor using wire mesh as filler, with a rotational speed of 1500 revolutions per minute. Oxygen-containing gas is sprayed into the rotating bed from the bottom of the reactor through a gas distributor. Regulated Fe 2+ The relative flow of the solution and the lye makes the pH of the slurry at the outlet of the reactor 8.0. The outlet slurry is pumped into the aging tank via a sampling pump. The heating temperature of the aging tank is 40°C, stirring, bubbling and oxidation with oxygen-containing gas, and the aging time is 10 minutes. After aging, the slurry was subjected to routine operations such as separation, washing, and drying to obtain sample B.

Embodiment 3

[0032] Configure 1.5mol / L Fe(NO 3 ) 2 solution and 3.4mol / L NH 4 OH and NH 4 HCO 3 Mix the alkaline solution. A rotating packed bed supergravity reactor using wire mesh as filler, with a rotational speed of 2000 revolutions per minute. Oxygen-containing gas is sprayed into the rotating bed from the bottom of the reactor through a gas distributor. Regulated Fe 2+ The relative flow of the solution and the lye makes the pH of the slurry at the outlet of the reactor 7. The outlet slurry is pumped into the aging tank via a sampling pump. The heating temperature of the aging tank is 45° C., stirring, bubbling and oxidation with oxygen-containing gas, and the aging time is 90 minutes. After aging, the slurry was subjected to routine operations such as separation, washing, and drying to obtain sample C.

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Abstract

The invention belongs to the technical field of preparation of metal oxyhydroxides, and specifically relates to a preparation method and an application for iron oxyhydroxide. The preparation method comprises the following steps: under the condition of supergravity, mixing a Fe2+ metal salt solution with an alkaline solution, and allowing oxygen to reversely contact with a reaction solution at thesame time so as to obtain a mixed reaction slurry; subjecting the mixed reaction slurry to gas-liquid separation, and subjecting an obtained liquid to aging under the conditions of stirring and bubbling oxidation so as to prepare a suspension containing the iron oxyhydroxide; and subjecting the suspension to liquid-solid separation, and subjecting an obtained solid phase to washing and drying so as to obtain the iron oxyhydroxide. According to the invention, the precipitation process and the bubbling aging process of a supergravity reaction are performed in different reactors, so the processesof crystal nucleus generation and crystal nucleus growth are separated; through adjustment of parameters of temperature, time and stirring degree in bubbling aging, the environment of crystal nucleusgrowth is controlled; and preferably, nanoscale or submicron iron oxyhydroxide can be prepared, and has the characteristics of small average particle size, large specific surface area and uniform particle size distribution.

Description

technical field [0001] The invention belongs to the technical field of preparation of metal oxyhydroxides, and in particular relates to a preparation method and application of iron oxyhydroxides. Background technique [0002] As an important industrial material, iron oxyhydroxide has a wide range of application values, and has shown excellent application prospects in the fields of heavy metal particle adsorption, organic matter degradation, solid-phase / liquid-phase desulfurization, and coal liquefaction. [0003] The preparation of iron oxyhydroxide powder is often prepared by chemical solution (wet method) by controlling certain reaction conditions, such as reactant concentration, pH value, stirring speed, or oxidation speed. For example, Chinese patent CN101070491A discloses a preparation method of ferric oxyhydroxide, which is characterized in that the - The ionic ferrous salt reacts with the alkaline precipitant to form a mesophase, which is then oxidized by an oxidant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02C10G47/02C10G47/04B01J23/745B01J35/10
CPCC10G47/02C10G47/04C01G49/02B01J23/745C01P2004/64C01P2006/12C01P2006/14C01P2006/16B01J35/615B01J35/635B01J35/647
Inventor 江莉龙马永德曹彦宁林科
Owner FUZHOU UNIV
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