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Method for preparing bismuth vanadate yellow pigment

A yellow pigment, bismuth vanadate technology, applied in the field of vanadium chemical industry, can solve the problems of large particles of bismuth molybdenum vanadate products, difficulty in meeting application requirements, uneven distribution, etc., and achieve the effect of fine particles, good application prospects and uniform composition

Active Publication Date: 2018-01-09
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above method either requires high temperature and long reaction time, or the obtained bismuth molybdovanadate product has large particles and uneven distribution, which is difficult to meet higher application requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) After mixing ethanol, acetic acid and water in a volume ratio of 0.2:0.2:1, add 0.1mol bismuth nitrate pentahydrate, and stir to obtain a mixed solution, wherein the concentration of bismuth nitrate is 0.1mol / L;

[0035] (2) 0.1mol ammonium metavanadate is dissolved in the ammonium bicarbonate solution that 1L concentration is 2mol / L, in the mixed solution that step (1) obtains at a constant speed, control the mol ratio of vanadium and bismuth to be 1:1, Then add ammonia water to adjust the pH to 5.8, and stir for 0.5h;

[0036] (3) Transfer the pH-adjusted solution in step (2) to a stainless steel autoclave, heat to 90°C for 6 hours, cool to room temperature naturally after the reaction is completed, then filter and separate, and pass the obtained solid phase through absolute ethanol in sequence , Drying after cleaning with deionized water;

[0037] (4) Put the dried material in step (3) in a muffle furnace, and bake it at 300° C. for 5 hours to obtain a bismuth v...

Embodiment 2

[0039] (1) After mixing ethanol, acetic acid and water in a volume ratio of 0.5:0.5:1, add 0.25mol bismuth nitrate pentahydrate, and stir to obtain a mixed solution, wherein the concentration of bismuth nitrate is 0.25mol / L;

[0040](2) Dissolve 0.25mol ammonium metavanadate in 1L of ammonium bicarbonate solution with a concentration of 2.5mol / L, drop it into the mixed solution obtained in step (1) at a constant speed, and control the molar ratio of vanadium and bismuth to be 1:1 , then add sodium hydroxide solution to adjust the pH to 6, and stir for 0.5h;

[0041] (3) Transfer the pH-adjusted solution in step (2) to a stainless steel autoclave, heat to 100°C for 4 hours, cool to room temperature naturally after the reaction is completed, then filter and separate, and pass the obtained solid phase through absolute ethanol in sequence 1. After washing with deionized water, dry in an oven at 80°C for 6 hours;

[0042] (4) Put the dried material in step (3) in a muffle furnace,...

Embodiment 3

[0044] (1) After mixing ethanol, acetic acid and water in a volume ratio of 0.7:0.7:1, add 0.6mol bismuth nitrate pentahydrate, and stir to obtain a mixed solution, wherein the concentration of bismuth nitrate is 0.6mol / L;

[0045] (2) Dissolve 0.6mol ammonium metavanadate in 1L of ammonium bicarbonate solution with a concentration of 3.5mol / L, drop it into the mixed solution obtained in step (1) at a constant speed, and control the molar ratio of vanadium and bismuth to be 1:1 , then add ammonia water to adjust the pH to 6.2, and stir for 0.5h;

[0046] (3) Transfer the pH-adjusted solution in step (2) to a stainless steel autoclave, heat to 105°C for 4 hours, cool to room temperature naturally after the reaction is completed, then filter and separate, and pass the obtained solid phase through absolute ethanol in sequence 1. After washing with deionized water, dry in an oven at 80°C for 6 hours;

[0047] (4) Put the dried material in step (3) in a muffle furnace, and bake it...

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Abstract

The invention relates to a method for preparing a bismuth vanadate yellow pigment. The method comprises the following steps: after mixing ethanol, acetic acid and water, adding bismuth nitrate pentahydrate; stirring to obtain a mixed solution; after dissolving ammonium metavanadate into an ammonium bicarbonate solution, adding into a mixed solution; then adding alkali liquid to regulate the pH (Potential of Hydrogen); heating to react; after reacting, carrying out solid-liquid separation; after drying an obtained solid phase, carrying out heat treatment to obtain the bismuth vanadate yellow pigment. According to the method provided by the invention, the disadvantages of a solid-phase synthesis method are overcome, and a bismuth vanadate product with excellent performance is obtained by utilizing a water-bath method. In a preparation process, reactants are uniformly mixed; bismuth vanadate with fine grains and uniform composition can be obtained; meanwhile, the problem that a lot of acid and alkali are consumed in a liquid-phase precipitation-calcination method is also avoided. The method provided by the invention is easy to operate, has a simple technology, is suitable for industrial production and has a good application prospect.

Description

technical field [0001] The invention relates to the field of vanadium chemical industry, in particular to a method for preparing bismuth vanadate yellow pigment. Background technique [0002] Yellow is an eye-catching color. Chrome yellow and cadmium yellow, the most commonly used inorganic yellow pigments in the world today, have good performance, but because they contain metal elements such as lead, chromium (VI) and cadmium that are harmful to human health and pollute the environment, Its fields of application are increasingly restricted. Although a series of organic yellow pigments can be used as substitutes, they cannot meet the actual needs of hiding power, durability and other properties. [0003] Research has found that bismuth vanadate and its derivatives have the technical properties of yellow pigments. Bismuth vanadate is a polymorphic compound, and there are mainly 4 different crystal forms. They are orthorhombic vanadium-bismuth crystals, monoclinic scheelite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00
Inventor 周冰晶白丽李兰杰高明磊王海旭高玲玲
Owner HEBEI IRON AND STEEL
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