Technique for producing ceramic yellow color of bismuth vanadate clad by compound of silicate class

A technology of coating bismuth vanadate and silicon dioxide, which is applied in the fields of vanadium compounds, inorganic pigment treatment, inorganic chemistry, etc., can solve problems such as obstruction and health pollution, and achieve the effect of loose structure, elimination of harm, and bright colors

Inactive Publication Date: 2009-11-11
SHIJIAZHUANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method that can eliminate the harm to the health of workers and the pollution to the environment caused by the production of pigments and solve the problem that my country's export of ceramic products is blocked due to the excessive dissolution of toxic heavy metals such as lead, cadmium, and chromium. The production process of preparing silica-coated bismuth vanadate yellow ceramic pigments from problematic silicate compounds

Method used

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  • Technique for producing ceramic yellow color of bismuth vanadate clad by compound of silicate class
  • Technique for producing ceramic yellow color of bismuth vanadate clad by compound of silicate class
  • Technique for producing ceramic yellow color of bismuth vanadate clad by compound of silicate class

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Effect test

preparation example Construction

[0021] (1) Yellow pigment BiVO 4 preparation of

[0022] Prepare 0.5-2.0mol / L concentration of Bi(NO 3 ) 3 Solution 100-1000mL, need to add 5-200mL concentrated HNO when preparing 3 to inhibit Bi(NO 3 ) 3 The hydrolysis; simultaneously 100-1000mL ammonium metavanadate is dissolved in the NaOH solution of 1-8mol / L to obtain and Bi(NO 3 ) 3 Solution isotropic NH 4 VO 3 Solution 100-1000mL. Under stirring, 100-1000mL NH 4 VO 3 The solution was added dropwise to the same volume of Bi(NO 3 ) 3 In the solution, adjust the pH to 4.5-7.5, and at the same time raise the temperature of the reaction solution to 60-100° C. and then keep it warm for 0.5-2.0 hours. During this process, NaOH solution needs to be added dropwise to maintain a constant pH value. Then, carry out suction filtration, wash the precipitate with a large amount of distilled water to wash away impurity ions, and then wash with organic solvent absolute ethanol to prevent the agglomeration of particles durin...

Embodiment 1

[0042] The production technology of bismuth vanadate yellow ceramic pigment coated with silicate compound is characterized in that it comprises the following process:

[0043] (1) Yellow pigment BiVO 4 Preparation of:

[0044] A. Prepare 0.5mol / L concentration of Bi(NO 3 ) 3 Solution 100mL, need to add 5mL concentrated HNO when preparing 3 to inhibit Bi(NO 3 ) 3 hydrolysis;

[0045] B. Add NH 4 VO 3 Dissolved in 2mol / L NaOH solution to obtain Bi(NO 3 ) 3 Solution isotropic NH 4 VO 3 Solution 100mL;

[0046] C. Under stirring, 100mL NH 4 VO 3 The solution was added dropwise to the same volume of Bi(NO 3 ) 3 In the solution, adjust the pH to 4.5 with sodium hydroxide or ammonia water, heat up to 100° C. and then keep it warm for 1.0 hour, then perform suction filtration, wash with distilled water, and dry at 80° C. to obtain loose powdery bismuth vanadate yellow pigment;

[0047] (2) High temperature resistant yellow pigment BiVO 4 / SiO 2 Preparation of:

[0...

Embodiment 2

[0050] The production technology of bismuth vanadate yellow ceramic pigment coated with silicate compound is characterized in that it comprises the following process:

[0051] (1) Yellow pigment BiVO 4 Preparation of:

[0052]A. Prepare 2.0mol / L concentration of Bi(NO 3 ) 3 Solution 1000mL, need to add 200mL concentrated HNO when preparing 3 to inhibit Bi(NO 3 ) 3 hydrolysis;

[0053] B. Add NH 4 VO 3 Dissolved in 5mol / L NaOH solution to obtain the same Bi(NO 3 ) 3 Solution isotropic NH 4 VO 3 Solution 1000mL;

[0054] C. Under stirring, 1000mL NH 4 VO 3 The solution was added dropwise to the same volume of Bi(NO 3 ) 3 In the solution, adjust the pH to 6.2 with sodium hydroxide or ammonia water, heat it up to 80°C and then keep it warm for 2.0 hours, then perform suction filtration, wash with distilled water, and dry at 100°C to obtain loose powdery bismuth vanadate yellow pigment;

[0055] (2) High temperature resistant yellow pigment BiVO 4 / SiO 2 Preparat...

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Abstract

This invention relates to a process for producing silicate-coated BiVO4 yellow ceramic pigment. The process comprises: preparing yellow pigment BiVO4, and preparing heat-resistant yellow pigment BiVO4 / SiO2. The process utilizes silicate as the Si source to coat the surface of BiVO4 with SiO2. Since SiO2 has strong inertia, the yellow ceramic pigment can resist 1000 deg.C high temperature, and has good color, loose structure and fine particles even calcined at 1000 deg.C. Besides, the yellow ceramic pigment is environmentally friendly, and does not contain toxic heavy metals such as Pd, Cd and Cr.

Description

technical field [0001] The invention relates to a production process for preparing silicon dioxide-coated bismuth vanadate yellow ceramic pigments from silicate compounds. Background technique [0002] The existing yellow ceramic pigments have the following types: cadmium yellow (CdS), chrome yellow (PbCrO 4 , BaCrO 4 ), antimony yellow (Sb 2 o 5 2PbO), Chrome Titanium Yellow [TiO 2 (Cr, Sb)], etc., they all contain toxic heavy metal elements such as lead, chromium, and cadmium. Ceramic pigments containing heavy metals, on the one hand, cause direct poisoning to the health of production workers during the pigment production process, and on the other hand, when the pigments are corroded by acid, the dissolution of heavy metals will also endanger human health. Therefore, it is urgent to develop a kind of green and environment-friendly yellow ceramic pigment. Bismuth vanadate yellow pigment is a new type of pigment with bright prospects. It has excellent properties of non...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85C09C3/06C01G31/00
Inventor 张星辰张萍次立杰段书德许保恩
Owner SHIJIAZHUANG UNIVERSITY
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