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Preparation method of flake ferric oxide

An iron oxide, flake technology, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of product performance impact and restrict product performance, and achieve the effect of improving the degree of flakes and improving the mixing effect.

Inactive Publication Date: 2010-12-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of additives in the process of preparing flake iron oxide by molten salt method is rarely reported.
In addition, the mixing effect of raw materials and molten salt also has a great influence on the product performance, but the current molten salt method uses traditional dry grinding and mixing, which restricts the further improvement of product performance to a certain extent

Method used

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  • Preparation method of flake ferric oxide
  • Preparation method of flake ferric oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Mix and grind 10g of ferric chloride hexahydrate, 15g of sodium sulfate, 5g of potassium sulfate and 0.3g of aluminum sulfate in a mortar at room temperature for 10 minutes, transfer them to a beaker, add 500ml of dilute sulfuric acid with a concentration of 0.2mol / L, and place Stir in a water bath at 60°C for 30 minutes to fully dissolve, then put the solution in an oven and dry at 110°C for 24 hours, take it out and grind it for 5 minutes, put it into a corundum crucible, put it in a muffle furnace for calcination at 1100°C for 4 hours, and cool it naturally Take out the sample and transfer it to a beaker, add 500ml of distilled water to make a suspension, stir in a water bath at 60°C for 2 hours, filter, wash with distilled water for 3 times, put the filter cake in a blast drying oven at 90°C for 3 hours, take it out and grind to obtain Flake iron oxide product, its scanning electron microscope picture is shown in figure 1 .

Embodiment 2

[0024] Mix and grind 10g of ferric chloride hexahydrate, 15g of sodium sulfate, 5g of potassium sulfate and 0.3g of zinc sulfate in a mortar at room temperature for 10 minutes, transfer them to a beaker, add 500ml of dilute sulfuric acid with a concentration of 0.2mol / L, and place Stir in a water bath at 60°C for 30 minutes to fully dissolve, then put the solution in an oven and dry at 110°C for 24 hours, take it out and grind it for 5 minutes, put it into a corundum crucible, put it in a muffle furnace for calcination at 1100°C for 4 hours, and cool it naturally Take out the sample and transfer it to a beaker, add 500ml of distilled water to make a suspension, stir in a water bath at 60°C for 2 hours, filter, wash with distilled water for 3 times, put the filter cake in a blast drying oven at 90°C for 3 hours, take it out and grind to obtain Flake iron oxide product, its scanning electron microscope picture is shown in figure 2 .

[0025] Through scanning electron microscop...

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Abstract

The invention discloses a preparation method of flake ferric oxide, which comprises the following steps: dissolving ferric trichloride hexahydrate, a composite fused salt and an additive in dilute sulphuric acid to prepare solution of a precursor; drying at 100 to 150 DEG C for 24 to 36 hours till no water exists, grinding to obtain precursor powder, and sintering at 900 to 1,200 DEG C for 2 to 6 hours; and obtaining a flake ferric oxide product by stirring in water bath, washing, filtering and drying. In the invention, the precursor is prepared by wet-method crystallization rather than the conventional dry-method mixing, so the agglomeration problem of the product is solved effectively; an aluminum oxide or zinc oxide additive is introduced for crystal form guiding; and the product is hexagonal flakes with flat and smooth surfaces, the particle dispersing performance of the product is high, the average particle size is 20 to 60 mu m, the thickness is uniformly distributed around 0.4 mu m, and the diameter-to-thickness ratio is 50 to 150. The prepared flake ferric oxide product can be wieldy used in anticorrosion coatings, high-quality pearl pigments and cosmetics as an inorganic rust-resisting material.

Description

technical field [0001] The invention relates to a method for preparing flaky iron oxide with a high diameter-thickness ratio by using ferric chloride hexahydrate as a raw material and combining wet crystallization and molten salt calcination, belonging to the field of inorganic powder material preparation. Background technique [0002] Flaky iron oxide has a unique scale structure, the main component is α-Fe 2 o 3 , for the hematite-type Fe 2 o 3 It is widely used in anti-corrosion coatings, pearlescent pigments and cosmetics. Because its sheet structure is similar to mica, it is also called mica iron oxide. At present, natural mica iron oxide is widely used in the world. It is made from natural mica iron oxide ore through crushing, beneficiation, crushing and other processes. The product has high impurity content, irregular shape, rough surface, and very It is difficult to meet the requirements of high-grade fine pigments. Compared with natural products, synthetic fla...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor 叶红齐韩凯李友凤刘辉
Owner CENT SOUTH UNIV
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