Method for preparing yellow bismuth vanadate pigment via molten salt method

A molten salt method and bismuth vanadate technology, applied in the field of inorganic pigments, can solve the problems of pigment color and luster, poor chemical stability, uneven pigment particle size distribution, and difficulty in fully carrying out the reaction, so as to shorten the calcination time, reduce the calcination temperature, Avoid the effects of the use of acids and bases

Inactive Publication Date: 2014-03-05
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The solid state reaction method requires high energy consumption, and the reaction speed is affected by the diffusion kinetics, so the reaction is not easy to fully carry out, the prepared pigment particle size distribution is uneven, the color and c

Method used

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  • Method for preparing yellow bismuth vanadate pigment via molten salt method
  • Method for preparing yellow bismuth vanadate pigment via molten salt method
  • Method for preparing yellow bismuth vanadate pigment via molten salt method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] ⑴ put 15.52g V 2 o 5 , 39.76g Bi 2 o 3 , 110.56g KNO 3 After ball milling for 30 minutes, the powder precursor was prepared.

[0026] (2) Heat the powder precursor obtained in step (1) in a muffle furnace at 500° C. for 3 hours in an air atmosphere.

[0027] (3) Naturally cool the material obtained in step (2) to room temperature, dissolve the nitrate in it with hot water, separate the solid sample by suction filtration, and then dry it at 100°C to obtain BiVO with monoclinic structure 4 product.

Embodiment 2

[0029] ⑴ put 9.09g V 2 o 5 , 23.30g Bi 2 o 3 After ball milling for 30 minutes, add 162g NaNO 3 After continuing ball milling for 10 minutes, a powder precursor was prepared.

[0030] (2) Heat the powder precursor obtained in step (1) in a muffle furnace at 400° C. for 9 hours in an air atmosphere.

[0031] (3) Naturally cool the material obtained in step (2) to room temperature, dissolve the nitrate in hot water, separate the solid sample by suction filtration, and then dry it at 110°C to obtain BiVO with monoclinic structure 4 product.

Embodiment 3

[0033] ⑴ put 9.09g V 2 o 5 , 23.30g Bi 2 o 3 After ball milling for 10 minutes, add 13.73g LiNO 3 and 18.66g KNO 3 , and continue ball milling for 10 minutes to make a powder precursor.

[0034] (2) Heat the powder precursor obtained in step (1) in a muffle furnace at 350° C. for 12 hours in an air atmosphere.

[0035] (3) Naturally cool the material obtained in step (2) to room temperature, dissolve the nitrate in hot water, separate the solid sample by suction filtration, and then dry it at 90°C to obtain BiVO with monoclinic structure 4 product.

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Abstract

The invention discloses a method for preparing a yellow bismuth vanadate pigment having a monocline structure. The method comprises the following steps: performing ball milling on Bi2O3 and V2O5 which are taken as raw materials and an alkali metal nitrate which is taken as a molten salt medium so as to prepare a powder precursor; and then preparing the yellow bismuth vanadate pigment via the molten salt method. The calcination temperature of the synthesized yellow bismuth vanadate pigment is effectively decreased and the heat preserving time is shortened under a liquid-state environment provided by the molten salt medium, and thus the energy consumption is facilitated; meanwhile, the problem that a large quantity of acids and alkalis are consumed during a liquid-phase precipitation method is avoided, and thus the production cost reduction is facilitated. The method is simple in preparation process; raw materials are easily obtained; the prepared yellow bismuth vanadate pigment is good in quality and uniform in particle distribution. Thus, the method is easy to industrialize.

Description

technical field [0001] The invention belongs to the technical field of inorganic pigments, in particular to a method for synthesizing high-performance bismuth vanadate yellow pigments by a molten salt method. Background technique [0002] Chrome yellow and cadmium yellow, the most commonly used inorganic yellow pigments in the world today, have good performance and a long history of application. However, due to the heavy metal elements such as lead, chromium (Ⅵ) and cadmium that are harmful to human health and pollute the environment, their application fields are restricted. The relevant regulations are becoming more and more restrictive. For example, the EU legislated in 1992 that all lead compounds and compounds with lead content ≥ 0.15% must be marked with the skull cross symbol and the words "will cause damage to unborn babies". As a result, the pigments used in industrial paints are lead-free. tendency is increasing. [0003] The strengthening of health and environmen...

Claims

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Application Information

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IPC IPC(8): C01G31/00
Inventor 唐安平刘立华周智华徐国荣令玉林
Owner HUNAN UNIV OF SCI & TECH
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