阅读说明：本技术 硅酸盐复合钛白及制备方法 (Silicate composite titanium white and preparation method thereof ) 是由 魏绪春 魏东东 廖新 于 2019-11-04 设计创作，主要内容包括：本发明公开一种硅酸盐复合钛白及制备方法,其中,硅酸盐复合钛白制备方法包括：取陶瓷尾料研磨成粉状,将粉状陶瓷尾料和氧化钙焙烧后,溶于水中获得液态基体；将获得的液态基体搅拌,脱水过滤,取脱水渣,所述脱水渣含水率小于15％；将获得所述脱水渣气磨至含水率小于1％,制成所述硅酸盐复合钛白。本发明中提供的制备方法,制备步骤简单；通过将陶瓷尾料与氧化钙焙烧,从而可利用陶瓷尾料中的硅酸铝盐,生成CaO-Al<Sub>2</Sub>O<Sub>3</Sub>-SiO<Sub>2</Sub>三元体系；通过将陶瓷尾料进行利用,从而保护环境。(The invention discloses silicate composite titanium dioxide and a preparation method thereof, wherein the preparation method of the silicate composite titanium dioxide comprises the following steps: grinding the ceramic tailings into powder, roasting the powder ceramic tailings and calcium oxide, and dissolving the roasted powder ceramic tailings and calcium oxide in water to obtain a liquid matrix; stirring the obtained liquid matrix, dehydrating and filtering, and taking dehydrated slag, wherein the water content of the dehydrated slag is less than 15%; and (3) carrying out air grinding on the obtained dehydrated slag until the water content is less than 1%, thus preparing the silicate composite titanium white. The preparation method provided by the invention has simple preparation steps; by roasting the ceramic tailing and calcium oxide, the CaO-Al can be generated by utilizing the aluminum silicate in the ceramic tailing 2 O 3 ‑SiO 2 A ternary system; by utilizing the ceramic tailings, the ceramic tailings are utilized,thereby protecting the environment.)

1. The preparation method of the silicate composite titanium dioxide is characterized by comprising the following steps:

grinding ceramic tailings into powder, roasting the powder ceramic tailings and calcium oxide, and dissolving the roasted powder ceramic tailings and calcium oxide in water to obtain a liquid matrix;

step two, stirring the liquid matrix obtained in the step one, dehydrating and filtering, and taking dehydrated slag;

and step three, carrying out air grinding on the dehydrated slag obtained in the step two until the moisture content is less than 1%, and preparing the silicate composite titanium dioxide.

2. The method for preparing the silicate composite titanium dioxide according to claim 1, wherein the first step comprises:

grinding the ceramic tailings into powder, putting 85-95 parts by mass of the powder ceramic tailings and 5-8 parts by mass of calcium oxide into a flash furnace for roasting, and adding water for uniformly mixing to obtain a liquid matrix.

3. The method for preparing the silicate composite titanium dioxide according to claim 1, wherein the calcination temperature in the first step is 800-950 ℃.

4. The method for preparing the silicate composite titanium dioxide according to claim 1, wherein the second step comprises:

and (3) stirring the liquid matrix obtained in the step one for 20-40 min, dehydrating and filtering, and taking dehydrated slag.

5. The method for preparing the silicate composite titanium dioxide according to claim 1, wherein the moisture content of the dehydrated slag is less than 15%.

6. The method for preparing silicate composite titanium dioxide according to claim 5, wherein the titanium source is titanyl sulfate.

7. The method for preparing the silicate composite titanium dioxide according to claim 1, wherein the third step comprises:

and (3) carrying out air grinding on the dehydrated slag obtained in the second step until the moisture content is less than 1% and the particle size is less than 100nm, and preparing the silicate composite titanium dioxide.

8. A silicate composite titanium white produced by the production method of the silicate composite titanium white according to any one of claims 1 to 7.

Technical Field

The invention relates to the technical field of titanium dioxide manufacturing, in particular to silicate composite titanium dioxide and a preparation method thereof.

Background

With the rapid development of ceramic industry in China, more and more ceramic products are wasted. The wastes are still simply treated in a landfill mode at present, occupy the land andaffecting the ecological environment. The chemical composition of the ceramic waste is basically silicon-aluminum, for example, the chemical component of the waste polished brick is SiO₂：69.14％，Al₂O₃：21.20％，Fe₂O₃：0.89％，CaO：0.24％，MgO：0.48％，K₂O：1.95％，Na₂O: 1.12%, etc. The ceramic waste is generally fired at the high temperature of 700-1200 ℃, has excellent chemical stability and is not easy to degrade.

Titanium white is a fine chemical raw material, has strong covering power, tinting strength and opacity, and is mainly used as a white pigment. In the prior art, the titanium white is prepared by a sulfuric acid method or a chlorination method, and the cost and the supply are in short supply due to complex process, large energy consumption and serious pollution.

Therefore, there is a need to provide a new silicate composite titanium white to solve the above technical problems.

Disclosure of Invention

The invention mainly aims to provide a silicate composite titanium white and a preparation method thereof, and aims to solve the technical problems of complex production process and serious pollution of the existing titanium white.

In order to achieve the purpose, the preparation method of the silicate composite titanium dioxide provided by the invention comprises the following steps:

grinding ceramic tailings into powder, roasting the powder ceramic tailings and calcium oxide, and dissolving the roasted powder ceramic tailings and calcium oxide in water to obtain a liquid matrix;

step two, stirring the liquid matrix obtained in the step one, dehydrating and filtering, and taking dehydrated slag;

and step three, carrying out air grinding on the dehydrated slag obtained in the step two until the moisture content is less than 1%, and preparing the silicate composite titanium dioxide.

Further, the first step comprises:

grinding the ceramic tailings into powder, putting 85-95 parts by mass of the powder ceramic tailings and 5-8 parts by mass of calcium oxide into a flash furnace for roasting, and adding water for uniformly mixing to obtain a liquid matrix.

Further, the roasting temperature in the first step is 800-950 ℃.

Further, the second step comprises:

and (3) stirring the liquid matrix obtained in the step one for 20-40 min, dehydrating and filtering, and taking dehydrated slag.

Further, the moisture content of the dehydrated slag is less than 15%.

Further, the titanium source is titanyl sulfate.

Further, the third step includes:

and (3) carrying out air grinding on the dehydrated slag obtained in the second step until the moisture content is less than 1% and the particle size is less than 100nm, and preparing the silicate composite titanium dioxide.

The invention also provides a silicate composite titanium dioxide prepared by the preparation method of the silicate composite titanium dioxide.

The preparation method provided by the invention has simple preparation steps; by roasting the ceramic tailing and calcium oxide, the CaO-Al can be generated by utilizing the aluminum silicate in the ceramic tailing₂O₃SiO₂A ternary system; through the second step, the aluminum silicate can be used as a carrier, and titanium dioxide is coated outside, so that the prepared silicate composite titanium white is increased; the ceramic tailings are utilized, so that the environment is protected.

Drawings

Fig. 1 is a schematic flow chart of a method for preparing silicate composite titanium dioxide according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.

The invention provides a preparation method of silicate composite titanium dioxide, which comprises the following steps:

s1, grinding the ceramic tailings into powder, roasting the powder ceramic tailings and calcium oxide, and dissolving the roasted powder ceramic tailings and calcium oxide in water to obtain a liquid matrix;

specifically, grinding ceramic tailings into powder, putting 85-95 parts by mass of the powder ceramic tailings and 5-8 parts by mass of calcium oxide into a flash furnace, roasting at 800-950 ℃, and uniformly mixing with water to obtain a liquid matrix.

The ceramic tailing can be powder generated in the polishing process of the polishing brick; or may be a disposable ceramic article. When the ceramic tailings can be powder generated during polishing of the polished tile, the grinding step can be omitted.

By sintering the powdery ceramic tailings, the content of dyeing impurity elements can be reduced, and the whiteness of the liquid matrix is improved; meanwhile, the aluminum silicate in the ceramic tailing undergoes crystal form transformation, so that the performance of the aluminum silicate serving as a carrier is obviously improved.

Step S2, stirring the liquid matrix obtained in the step S1, dehydrating and filtering, and taking dehydrated slag;

in one embodiment, the liquid matrix obtained in the step S1 is stirred for 20-40 min, and is dehydrated and filtered to obtain dehydrated slag, wherein the moisture content of the dehydrated slag is less than 15%.

Titanium dioxide generated by calcining in the ceramic tailing can be coated with aluminum silicate in the liquid state stirring process, so that the whiteness of the prepared silicate composite titanium white is improved. Compared with the traditional titanium dioxide preparation method in the prior art, the aluminum silicate replaces the titanium dioxide inner core. By filtering, soluble water substances can be filtered out, and substances such as pigment can be reduced.

In another embodiment, a titanium source is added into the liquid matrix obtained in the step S1, stirring is carried out for 20-40 min, dehydration filtration is carried out, and dehydrated slag is obtained, wherein the moisture content of the dehydrated slag is less than 15%.

In this embodiment, a titanium source is added to compensate for the insufficient titanium element in the ceramic tailings, and a person skilled in the art can select whether to add the titanium source according to the type of the ceramic tailings. The titanium source is titanyl sulfate. The titanyl sulfate is hydrolyzed in water to generate titanium dioxide.

And S3, performing air grinding on the dehydrated slag obtained in the step S2 until the moisture content is less than 1%, and preparing the silicate composite titanium dioxide.

Specifically, the dehydrated slag obtained in the step S2 is subjected to air milling until the moisture content is less than 1% and the particle size is less than 100nm, so as to prepare the silicate composite titanium dioxide.

Performing gas milling on the dehydrated slag to ensure that the particle size is less than 100nm and the powder is fine; meanwhile, the water content is controlled to be less than 1 percent so as to increase the covering power of the prepared silicate composite titanium white.

The preparation method provided by the invention has simple preparation steps; by roasting the ceramic tailing and calcium oxide, the CaO-Al can be generated by utilizing the aluminum silicate in the ceramic tailing₂O₃-SiO₂A ternary system; step S2, aluminum silicate can be used as a carrier, and titanium dioxide is coated outside, so that the prepared silicate composite titanium white is increased; the ceramic tailings are utilized, so that the environment is protected.

The invention also provides the silicate composite titanium white prepared by the preparation method of the silicate composite titanium white.

The silicate composite titanium white provided by the invention is specifically illustrated by the following specific examples, wherein the ceramic tailings are collected from the county of the western union, the country of the western union, and the ceramic tailings comprise the following components:

	％		％
				SiO2	71.14	Al2O3	19.20
Fe2O3	0.77	CaO	0.21
				MgO	0.36	K2O	1.66
Na2O	1.24	impurities	Balance of