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Method for preparing hematite-type nano iron oxide red

A technology of iron oxide red and iron ore type, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of difficult control of particle size distribution, long working cycle, and environmental pollution, so as to shorten the production cycle and reduce pollutants , good dispersion effect

Inactive Publication Date: 2010-06-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a hematite-type nano-scale iron oxide red preparation technology for the existing preparation methods, which are difficult to control the particle size distribution, long working cycle, and pollute the environment.

Method used

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  • Method for preparing hematite-type nano iron oxide red
  • Method for preparing hematite-type nano iron oxide red

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Dissolve 40g ammonium ferrous sulfate in 100mL deionized water to make Fe 2+ solution, then add a mixture of 1g ammonium polymethacrylate and 0.25g sodium hexametaphosphate, add ammonia water dropwise under stirring to make the pH 4.0-4.5, then add 100mL (10%) sodium hypochlorite, and use ammonia water to control the pH between 4.0-4.5 During this period, the temperature was maintained at 25°C and the reaction was carried out for 60 minutes. After the reaction product settles, it is filtered to obtain a solid, and the solid is dried in a low-temperature vacuum for 0.5 hours at a temperature lower than 40° C. and a vacuum degree higher than -0.085 MPa to obtain a precursor. Mix the dried product with 1.5g of ammonium oxalate evenly, put it into a muffle furnace at 600°C and burn it for 2 hours, cool, grind and pulverize to obtain powdered hematite-type nano-scale iron oxide red. Tested by SEM, the product particle size of iron oxide red is less than 100nm. in: figure ...

Embodiment 2

[0024] Dissolve 40g ammonium ferrous sulfate in 100mL deionized water to make Fe 2+ Solution, then mix the mixture of 1g polyethylene glycol and 0.35g sodium dodecylbenzenesulfonate, add sodium hydroxide dropwise under stirring to make the pH 4.0~4.5, then add 100mL (10%) sodium hypochlorite, and control it with sodium hydroxide The pH is 4.0-4.5, the temperature is kept at 27°C, and the reaction is carried out for 45 minutes. After the reaction product settled, it was filtered to obtain a solid, and the solid was vacuum-dried at low temperature for 1 hour to obtain a precursor. Mix the dry product with 1g of ammonium carbonate evenly, put it into a muffle furnace at 700°C and burn for 1.5 hours, cool, grind and pulverize to obtain powdered hematite-type nano-scale iron oxide red. Product is carried out SEM, XRD measurement, shows that its product is consistent with the final product in embodiment 1.

Embodiment 3

[0026] Dissolve 40g ammonium ferrous sulfate in 100mL deionized water to make Fe 2+ solution, then mix 2g of polyvinyl alcohol, add sodium carbonate dropwise under stirring to make the pH 4.0-4.5, then add 10g of sodium chlorate solid, and use sodium carbonate to control the pH to 4.0-4.5, keep the temperature at 29°C, and react for 30 minutes. After the reaction product settled, it was filtered to obtain a solid, and the solid was vacuum-dried at low temperature for 1.5 hours to obtain a precursor. Mix the dry product with 0.5g of ammonium carbamate and ammonium bicarbonate mixture (mass ratio 1:4), put it into a muffle furnace at 800°C and burn for 1 hour, cool, grind and pulverize to obtain powdered hematite nano-scale Iron oxide red. Product is carried out SEM, XRD measurement, shows that its product is consistent with the final product in embodiment 1.

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Abstract

The invention relates to a method for preparing hematite-type nano iron oxide red. The method comprises the following steps of: taking ferrous salts as raw materials, adding a dispersant and soluble alkaline matter and controlling pH value to obtain seed crystal; then, adding an oxidant and controlling the pH value by the soluble alkaline matter to carry out reaction at a certain temperature for 0.5 to 1 hour; obtaining solid after sedimentation and filtration of reaction products and carrying out low-temperature vacuum drying on the solid for 0.5 to 2 hours to obtain precursor; and mixing the precursor and a pore-expanding agent to carry out high-temperature ignition for 1 to 2 hours to obtain powder hematite-type nano iron oxide red after cooling and grinding. The preparation method has the characteristics of simple operation, easily obtained raw materials, less pollution, short production cycle, small grain diameter of products, excellent dispersive property, and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of nanomaterials, in particular to a preparation technology of hematite-type nano-scale iron oxide red. Background technique [0002] The chemical formula of iron oxide red is α-Fe 2 o 3 . Iron oxide red is cheap, non-toxic, and has excellent performance. It has been widely used in various fields such as building materials, coatings, and rubber. When the size of iron oxide particles reaches the nanoscale, the number of surface atoms, specific surface area, and surface energy increase with the decrease of particle size, so they have many potential physical and chemical properties different from conventional materials, such as optical properties, Magnetic, catalytic and other properties, so that it can be popularized and applied in more fields. [0003] In the reports of scientific papers, the preparation methods of nano-iron oxide can be generally divided into two categories: wet method and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
Inventor 方卫民鲁旻阳郭伟强何雨舟陆晓星
Owner ZHEJIANG UNIV
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