Iron series pigment ihleite and preparation method thereof

An iron-based pigment and chemical method technology, applied in chemical instruments and methods, iron sulfate, iron compounds, etc., can solve the problems of poor product quality, high energy consumption, impure color, etc., and achieve less catalyst dosage and particle size. Uniform, bright and pure effect

Inactive Publication Date: 2016-08-10
JINAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is mentioned in the literature that the slow oxidation activity of free Thiobacillus ferrooxidans cells and the instability of the reaction make it impossible to be widely used in industry
[0006] In the conventional chemical synthesis method, one is to use ferric sulfate and sodium, potassium or ammonium hydroxide to undergo a series of reactions under high temperature conditions to obtain jarosite particles, but the reaction product often contains ferric hydroxide colloid, resulting in product The purity is low, the color is not pure, and the product quality is poor. Problems such as high price, large consumption and high energy consumption limit the large-scale production of jarosite

Method used

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  • Iron series pigment ihleite and preparation method thereof
  • Iron series pigment ihleite and preparation method thereof
  • Iron series pigment ihleite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Jarosite (NaFe 3 (SO 4 ) 2 (OH) 6 ) preparation

[0034] In the reactor 13.9g FeSO 4 ·7H 2 O and 1.18g of anhydrous sodium sulfate were dissolved in 12.8g of distilled water, and 0.4g of concentrated sulfuric acid was added under stirring. g sodium nitrite to maintain the reaction for 2 hours. After the reaction, the material was naturally cooled and allowed to stand. Then filter, and the jarosite filter cake is washed 3 times with sulfuric acid acidified water with a pH value of 2.0 to remove soluble impurities, then washed 2 times with distilled water, and dried at 95°C to obtain fine particles and uniform size , bright-colored jarosite powder, see XRD pattern figure 1 , FTIR spectrum see figure 2 , SEM image see image 3 .

Embodiment 2

[0035] Embodiment 2: jarosite (KFe 3 (SO 4 ) 2 (OH) 6 )preparation

[0036] In the reactor 27.8g FeSO 4 ·7H 2 O and 4.35g of potassium sulfate were dissolved in 25.6g of distilled water, and 0.75g of concentrated sulfuric acid was added under stirring. Under airtight conditions, air or oxygen was introduced, and the temperature of the reactor was heated to 70°C. Slowly add 0.25g of nitric acid in small amounts for several times. , to maintain the reaction for 2.5 hours. After the reaction, the material was naturally cooled, left to stand, filtered, washed 4 times with acidified water with a pH value of 1.7 to remove soluble impurities, then washed 4 times with distilled water, and dried at 110°C to constant weight. The jarosite powder with fine particles, smooth surface and bright color can be obtained.

Embodiment 3

[0037] Embodiment 3: yellow ammonium jarosite (NH 4 Fe 3 (SO 4 ) 2 (OH) 6 )preparation

[0038] In the reactor 41.7g FeSO 4 ·7H 2 O and 6.6g of ammonium sulfate were dissolved in 32.9g of distilled water, and 1.1g of concentrated sulfuric acid was added under stirring. Under airtight conditions, air or oxygen was introduced, and the temperature of the reactor was heated to 25°C. Slowly added 1.68g of nitric acid , to maintain the reaction for 4 hours. After the reaction, the material was cooled naturally, left to stand, filtered, washed three times with acidified water with a pH value of 1.5 to remove soluble impurities, then washed twice with distilled water, and dried at a drying temperature of 110°C until constant weight. The jarosite powder with fine particles, smooth surface and bright color can be obtained.

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Abstract

The invention belongs to the technical field of chemical synthesis, and discloses a chemically catalytically synthesized iron series pigment ihleite and a preparation method thereof. The method is characterized in that the iron series pigment ihleite is prepared through a reaction of reactants comprising ferrous sulfate and sulfate under acidic conditions with at least one of sodium nitrite and nitric acid as a catalytic oxidant. The iron series pigment ihleite is prepared through a hydrothermal reaction through carrying out catalytic oxidation on ferrous sulfate by the efficient catalyst sodium nitrite or nitric acid, so the use amount of the catalyst is small, and the catalysis efficiency is high; and the method has the advantages of mild reaction conditions, implementation of the reaction under normal pressure or a pressurized condition, simple process, simple operation, suitableness for industrial production, high production efficiency, low cost and environmental protection. The ihleite product with uniform particle size, a bright and pure color, a structured morphology and a basically octahedral structure or truncated octahedral structure is finally obtained through controlling the reaction temperature, the reaction time and the material ratio, the purity is 89% or above, and the iron series pigment ihleite has wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to an iron-based pigment jarosite synthesized by chemical method catalysis and a preparation method thereof. Background technique [0002] Pigments are insoluble fine solid particles dispersed in paints. They are an important part of paint formulations. They are mainly used for covering, coloring, providing protection, anti-corrosion and decoration. At the same time, they can also make some paints have certain special functions, such as Conductive, photochromic, thermochromic, etc. At present, inorganic pigments are the most widely used pigments in the paint industry, and the output accounts for more than 50% of the paint industry. Among the inorganic pigments, the output and market of iron-based pigments are second only to titanium dioxide, and are recognized as the second largest inorganic pigments. The application of iron-based pigments in human society c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14
CPCC01G49/009C01P2002/72C01P2002/82C01P2004/03C01P2006/80
Inventor 李明玉贾定田唐启红
Owner JINAN UNIVERSITY
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