阅读说明：本技术 一种偏钛酸合成复合硫酸钡的方法 (Method for synthesizing composite barium sulfate from metatitanic acid ) 是由 胡远飞 于 2021-09-01 设计创作，主要内容包括：本发明涉及钛白粉合成技术领域,尤其是指一种偏钛酸合成复合硫酸钡的方法,包括以下步骤：S1,采用硫酸法钛白生产工艺,取工艺中的偏钛酸备用；S2,取步骤S1中得到的偏钛酸,根据产品需要加入定量的98％硫酸溶解,再加入碳酸钡浆液反应；S3,将步骤S2中反应完成的产品经过洗涤、煅烧和粉碎得到复合硫酸钡钛白粉。本发明可以根据需要,随时调整硫酸的用量,来生产稳定性高的复合硫酸钡钛白粉。(The invention relates to the technical field of titanium dioxide synthesis, in particular to a method for synthesizing composite barium sulfate from metatitanic acid, which comprises the following steps: s1, adopting a sulfuric acid method titanium dioxide production process, and taking metatitanic acid in the process for later use; s2, adding quantitative 98% sulfuric acid to dissolve metatitanic acid obtained in the step S1 according to product requirements, and adding barium carbonate slurry to react; s3, washing, calcining and crushing the product obtained in the step S2 to obtain the composite barium sulfate titanium white powder. The invention can adjust the dosage of the sulfuric acid at any time according to the requirement to produce the composite barium sulfate titanium white powder with high stability.)

1. A method for synthesizing composite barium sulfate by metatitanic acid is characterized by comprising the following steps: the method comprises the following steps:

s1, adopting a sulfuric acid method titanium dioxide production process, and taking metatitanic acid in the process for later use;

s2, adding quantitative 98% sulfuric acid to dissolve metatitanic acid obtained in the step S1 according to product requirements, and adding barium carbonate slurry to react;

s3, washing, calcining and crushing the product obtained in the step S2 to obtain the composite barium sulfate titanium white powder.

2. The method for synthesizing composite barium sulfate by metatitanic acid according to claim 1, wherein the method comprises the following steps: the method for preparing metatitanic acid in step S1 is as follows: the titanium concentrate is acidolyzed into titanium liquid by sulfuric acid, the titanium liquid is precipitated and filtered to remove acid insoluble substances, the titanium liquid is frozen, crystallized and filtered to remove ferrous sulfate to obtain refined titanium liquid, and then the refined titanium liquid is hydrolyzed to obtain metatitanic acid.

3. The method for synthesizing composite barium sulfate by metatitanic acid according to claim 1, wherein the method comprises the following steps: taking 200g of metatitanic acid counted by TiO2, adding 800g of 98% sulfuric acid, and reacting with 1600g of barium carbonate to obtain the composite titanium dioxide containing 10% of TiO2 and 90% of BaSO 4.

4. The method for synthesizing composite barium sulfate by metatitanic acid according to claim 1, wherein the method comprises the following steps: 200g of metatitanic acid calculated by TiO2 is taken, 350g of 98 percent sulfuric acid is added, and the obtained product reacts with 700g of barium carbonate to obtain the composite titanium dioxide containing 20 percent of TiO2 and 80 percent of BaSO 4.

5. The method for synthesizing composite barium sulfate by metatitanic acid according to claim 1, wherein the method comprises the following steps: taking 200g of metatitanic acid counted by TiO2, adding 200g of 98 percent sulfuric acid, and reacting with 400g of barium carbonate to obtain the composite titanium dioxide containing 30 percent of TiO2 and 70 percent of BaSO 4.

6. The method for synthesizing composite barium sulfate by metatitanic acid according to claim 1, wherein the method comprises the following steps: taking 200g of metatitanic acid calculated by TiO2, adding 90g of 98% sulfuric acid, and reacting with 175g of barium carbonate to obtain the composite titanium dioxide containing 50% of TiO2 and 50% of BaSO 4.

Technical Field

The invention relates to the technical field of titanium dioxide synthesis, in particular to a method for synthesizing composite barium sulfate from metatitanic acid.

Background

Titanium dioxide is the best white pigment, but has photocatalytic properties. Under ultraviolet light, the titanium dioxide has photocatalysis to decompose organic matters into carbon dioxide and water. The problem that the product produced by titanium dioxide is not sun-proof is caused. Meanwhile, titanium dioxide is amphoteric and can generate decomposition reaction with acid and alkali.

The barium sulfate powder is very stable in nature, is insoluble in water and does not react with acid and alkali. Barium sulfate has the characteristics of high gloss and high whiteness.

In order to improve the utilization rate of titanium dioxide, a large amount of composite titanium dioxide appears on the market. Most of the composite titanium dioxide in the market is prepared by directly and physically mixing calcium carbonate, talcum powder, bentonite, barium sulfate and other powder with titanium dioxide. Although many documents have a process technique of coating titanium dioxide on the surface of a core made of an inexpensive raw material, no industrial production has been achieved. Therefore, it is necessary to provide a method for synthesizing composite barium titanium sulfate white powder to solve the above problems.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method for synthesizing composite barium sulfate by metatitanic acid, which can adjust the use amount of sulfuric acid at any time according to requirements to produce high-stability composite barium sulfate titanium white.

In order to solve the technical problems, the invention adopts the following technical scheme:

a method for synthesizing composite barium sulfate from metatitanic acid comprises the following steps:

s1, adopting a sulfuric acid method titanium dioxide production process, and taking metatitanic acid in the process for later use;

s2, adding quantitative 98% sulfuric acid to dissolve metatitanic acid obtained in the step S1 according to product requirements, and adding barium carbonate slurry to react;

s3, washing, calcining and crushing the product obtained in the step S2 to obtain the composite barium sulfate titanium white powder.

Preferably, the method for preparing metatitanic acid in step S1 is as follows: the titanium concentrate is acidolyzed into titanium liquid by sulfuric acid, the titanium liquid is precipitated and filtered to remove acid insoluble substances, the titanium liquid is frozen, crystallized and filtered to remove ferrous sulfate to obtain refined titanium liquid, and then the refined titanium liquid is hydrolyzed to obtain metatitanic acid.

Preferably, 200g of metatitanic acid calculated by TiO2 is added with 800g of 98% sulfuric acid to react with 1600g of barium carbonate to obtain the composite titanium dioxide containing 10% of TiO2 and 90% of BaSO 4.

Preferably, 200g of metatitanic acid calculated by TiO2 is added with 350g of 98% sulfuric acid to react with 700g of barium carbonate to obtain the composite titanium dioxide containing 20% TiO2 and 80% BaSO 4.

Preferably, 200g of metatitanic acid calculated by TiO2 is added with 200g of 98% sulfuric acid to react with 400g of barium carbonate to obtain the composite titanium dioxide containing 30% of TiO2 and 70% of BaSO 4.

Preferably, 200g of metatitanic acid calculated by TiO2 is added with 90g of 98% sulfuric acid to react with 175g of barium carbonate to obtain the composite titanium dioxide containing 50% TiO2 and 50% BaSO 4.

The invention has the beneficial effects that:

in the actual use situation, when the content of barium sulfate in the composite titanium white powder is controlled to be lower than 70%, the properties of the composite titanium white powder, such as stability, glossiness and the like, can be effectively improved, and the covering power of the composite titanium white powder is not influenced.

Drawings

FIG. 1 is a schematic diagram of the results of the hiding power test of products No. 1-3 of the present invention;

FIG. 2 is a schematic diagram showing the results of the hiding power test of products No. 4-6 of the present invention.

Reference numerals:

1-100% barium sulfate; 2-90% barium sulfate; 3-80% barium sulfate; 4-70% barium sulfate; 5-50% barium sulfate; 6-0% of barium sulfate.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

Example 1

Taking 200g of metatitanic acid (Ti (OH)4) calculated by TiO2, adding 800g of 98 percent sulfuric acid, and reacting with 1600g of barium carbonate to obtain the composite titanium dioxide 2 containing 10 percent of TiO2 and 90 percent of BaSO 4.

Example 2

200g of metatitanic acid (Ti (OH)4) calculated by TiO2 is added with 350g of 98 percent sulfuric acid to react with 700g of barium carbonate to obtain the composite titanium dioxide 3 containing 20 percent of TiO2 and 80 percent of BaSO 4.

Example 3

Taking 200g of metatitanic acid (Ti (OH)4) calculated by TiO2, adding 200g of 98 percent sulfuric acid, and reacting with 400g of barium carbonate to obtain the composite titanium dioxide 4 containing 30 percent of TiO2 and 70 percent of BaSO 4.

Example 3

Taking 200g of metatitanic acid (Ti (OH)4) calculated by TiO2, adding 90g of 98 percent sulfuric acid, and reacting with 175g of barium carbonate to obtain the composite titanium dioxide 5 containing 50 percent of TiO2 and 50 percent of BaSO 4.

Examples 1-4 were tested for hiding power and the results of all comparative tests are shown in FIGS. 1-2.

The results of the cardboard test show that the hiding power is consistent with that of 100% titanium dioxide when the barium sulfate content is less than 70%. Therefore, when the content of barium sulfate in the composite titanium dioxide is controlled to be lower than 70%, the properties of the composite titanium dioxide such as stability, glossiness and the like can be effectively improved, and the covering power of the composite titanium dioxide is not influenced.

Measurement of hiding power: the determination is carried out based on GB 1726-1979 paint hiding power determination method.

Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.