阅读说明：本技术 一种回转窑用抗侵蚀耐磨陶瓷喷涂料及其制备方法 (Anti-erosion wear-resistant ceramic spray coating for rotary kiln and preparation method thereof ) 是由 楚科奇 崔战涛 徐晓阳 于 2021-09-18 设计创作，主要内容包括：本申请提供了一种回转窑用抗侵蚀耐磨陶瓷喷涂料及其制备方法,本申请通过对不同原料的优化对比,选择适合的原材料,采用科学的颗粒级配,研发出适用于工业固体废物处理回转窑用的抗侵蚀耐磨陶瓷喷涂料。通过电熔氧化锆、电熔氧化铬、氧化铝超细粉和粘结剂的合理配比,制备一种具有抗侵蚀、耐磨、耐高温的回转窑用抗侵蚀耐磨陶瓷喷涂料,从而保护耐火砖或浇注料,提高耐火砖或浇注料的使用寿命,降低回转窑的维护成本。(The application provides an anti-erosion wear-resistant ceramic spray coating for a rotary kiln and a preparation method thereof, and the anti-erosion wear-resistant ceramic spray coating suitable for the industrial solid waste treatment rotary kiln is developed by selecting suitable raw materials and adopting scientific grain grading through optimization and comparison of different raw materials. The erosion-resistant and wear-resistant ceramic spray coating for the rotary kiln, which has the advantages of erosion resistance, wear resistance and high temperature resistance, is prepared by reasonably proportioning the fused zirconia, the fused chromia, the alumina ultrafine powder and the binder, so that refractory bricks or castable is protected, the service life of the refractory bricks or the castable is prolonged, and the maintenance cost of the rotary kiln is reduced.)

1. The erosion-resistant wear-resistant ceramic spray coating for the rotary kiln is characterized by comprising the following components in parts by weight: the raw materials for preparing the anti-erosion wear-resistant ceramic spray coating for the rotary kiln comprise: 32-47% of a binding agent and 53-68% of mixed powder.

2. The erosion-resistant and wear-resistant ceramic spray coating for a rotary kiln as claimed in claim 1, wherein: the raw materials for preparing the binding agent comprise 45-62% of industrial phosphoric acid, 28-38% of water and 5-13% of aluminum hydroxide powder.

3. The erosion-resistant and wear-resistant ceramic spray coating for a rotary kiln as claimed in claim 1, wherein: the mixed powder comprises 82-85% of fused zirconia, 11-15% of fused chromium oxide and 4-8% of alumina ultrafine powder.

4. The erosion-resistant and wear-resistant ceramic spray paint for the rotary kiln as claimed in claim 3, wherein: ZrO in fused zirconia₂Not less than 99% of Fe₂O₃Is not higher than 0.05%, SiO₂The content of (A) is not higher than 0.2%.

5. The erosion-resistant and wear-resistant ceramic spray paint for the rotary kiln as claimed in claim 3, wherein: cr in electric smelting chromium oxide₂O₃Not less than 99% of Fe₂O₃The content of (A) is not higher than 0.3%.

6. The erosion-resistant and wear-resistant ceramic spray paint for the rotary kiln as claimed in claim 3, wherein: al in alumina ultrafine powder₂O₃The content of (C) is not less than 99.5%, Fe₂O₃The content of (A) is not higher than 0.2%.

7. The method for preparing the erosion-resistant and wear-resistant ceramic spray coating for the rotary kiln as claimed in claim 1, wherein: the method comprises the following steps:

(1) putting the fused zirconia, the fused chromia and the alumina ultrafine powder into a forced stirrer in sequence according to a proportion, mixing and stirring for 2-3 min, and then discharging into a storage bin;

(2) adding industrial phosphoric acid, water and aluminum hydroxide powder into a container in proportion, heating and stirring for 25-45 min, taking out after reacting into transparent colloid, and cooling to normal temperature for later use; the heating temperature is 45-65 ℃;

(3) and (4) uniformly stirring the bonding agent and the mixed powder according to a proportion to obtain a finished product.

Technical Field

The application relates to the field of refractory materials, in particular to an anti-erosion wear-resistant ceramic spray coating for a rotary kiln and a preparation method thereof.

Background

The refractory lining is a working surface of the rotary kiln during high-temperature incineration production and is a main structure of the rotary kiln for bearing high temperature. In the incineration process of treating industrial solid wastes, harmful substances contained in the industrial solid wastes can erode the inner lining of the rotary kiln due to long-term high-temperature operation, so that the strength of the refractory material of the inner lining of the rotary kiln is reduced and becomes brittle, and the inner lining is cracked under the conditions of temperature fluctuation and local temperature change; when the water contained in the waste is incinerated at high temperature, the surface temperature of the lining is greatly fluctuated, so that the lining is cracked and peeled; the cracking and peeling of the lining caused by mutual extrusion when the whole lining expands and changes due to the start and stop of the rotary kiln and the temperature change during the operation.

At present, the inner lining refractory material of the rotary kiln for treating industrial solid waste mainly uses chrome corundum bricks and chrome corundum castable, and has the characteristics of corrosion resistance and wear resistance. However, as the complexity of the industrial solid charging materials is increased, higher requirements are put on the characteristics of the refractory materials, the corrosion resistance and the wear resistance of the existing refractory materials cannot well deal with the incineration of the complex industrial solid wastes, and the service life of the refractory materials is seriously influenced.

Therefore, the technical personnel in the field provide an anti-erosion wear-resistant ceramic spray coating for a rotary kiln and a preparation method thereof, so as to solve the problems in the background technology.

Disclosure of Invention

Aiming at the defects of the prior art, the application aims to provide an anti-erosion wear-resistant ceramic spray coating for a rotary kiln and a preparation method thereof.

The technical scheme adopted by the application is as follows:

an anti-erosion wear-resistant ceramic spray coating for a rotary kiln is prepared from the following raw materials: 32-47% of a binding agent and 53-68% of mixed powder.

Further, the anti-erosion wear-resistant ceramic spray coating for the rotary kiln comprises 45-62% of industrial phosphoric acid, 28-38% of water and 5-13% of aluminum hydroxide powder.

Further, the anti-erosion wear-resistant ceramic spray coating for the rotary kiln comprises 82-85% of fused zirconia, 11-15% of fused chromia and 4-8% of alumina ultrafine powder.

Furthermore, an anti-erosion wear-resistant ceramic spray coating for rotary kiln, ZrO in electric smelting zirconia₂In a content ofLess than 99% Fe₂O₃Is not higher than 0.05%, SiO₂The content of the active carbon is not higher than 0.2%, the granularity of 1-0mm accounts for 40-55%, the granularity of 0.074mm accounts for 24-29%, the granularity of 0.005mm accounts for 12-28%, and the granularity of 0.001mm accounts for 8-13%.

Further, an anti-erosion and wear-resistant ceramic spray coating for rotary kiln, Cr in electric smelting chromium oxide₂O₃Not less than 99% of Fe₂O₃The content of the active carbon is not higher than 0.3 percent, the granularity of 1-0mm accounts for 3-8 percent, and the granularity of less than 0.005mm accounts for 2-5 percent.

Further, an anti-erosion and wear-resistant ceramic spray coating for rotary kiln, Al in alumina ultrafine powder₂O₃The content of (C) is not less than 99.5%, Fe₂O₃The content of (A) is not higher than 0.2%.

Further, the preparation method of the anti-erosion wear-resistant ceramic spray coating for the rotary kiln comprises the following steps:

(1) putting the fused zirconia, the fused chromia and the alumina ultrafine powder into a forced stirrer in sequence according to a proportion, mixing and stirring for 2-3 min, and then discharging into a storage bin;

(2) adding industrial phosphoric acid, water and aluminum hydroxide powder into a container in proportion, heating and stirring for 25-45 min, taking out after reacting into transparent colloid, and cooling to normal temperature for later use; the heating temperature is 45-65 ℃;

(3) and (4) uniformly stirring the bonding agent and the mixed powder according to a proportion to obtain a finished product.

The beneficial effect of this application lies in:

this application is through the optimization contrast to different raw materialss, selects suitable raw and other materials, adopts scientific grain composition, develops the wear-resisting ceramic spray coating of anti-erosion who is applicable to industry solid waste handles rotary kiln and uses, as one kind have anti-erosion, wear-resisting, high temperature resistant rotary kiln with wear-resisting ceramic spray coating of anti-erosion, can effectively protect resistant firebrick or castable, improve the life of resistant firebrick or castable, reduce the maintenance cost of rotary kiln.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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 application.

According to the application, 82-85% of fused zirconia, 11-15% of fused chromic oxide and 4-8% of alumina ultrafine powder are mixed according to the raw material ratio by mass fraction to obtain mixed powder; adding 45-62% by mass of industrial phosphoric acid, 28-38% by mass of water and 5-13% by mass of aluminum hydroxide powder into a container in proportion, stirring for 25-45 minutes at the temperature of 45-65 ℃, taking out after reacting into a transparent colloid, and cooling to normal temperature for later use; and preparing 32-47% of a bonding agent and 53-68% of mixed powder to prepare the anti-erosion wear-resistant ceramic spray coating for the rotary kiln.

Example 1

An anti-erosion wear-resistant ceramic spray coating for a rotary kiln is prepared by the following steps:

(1) putting the fused zirconia with the mass fraction of 83%, the fused chromia with the mass fraction of 12% and the alumina ultrafine powder with the mass fraction of 5% into a forced stirrer in sequence, mixing and stirring for 3min to obtain mixed powder, and taking out the mixed powder for later use;

(2) adding 55 mass percent of industrial phosphoric acid, 34 mass percent of water and 11 mass percent of aluminum hydroxide powder into a container in proportion, keeping the temperature at 52 ℃, stirring for 25-45 minutes, taking out after reacting into transparent colloid, and cooling to normal temperature for later use;

(3) and uniformly stirring the bonding agent accounting for 38 percent of the mass fraction and the mixed powder accounting for 63 percent of the mass fraction according to a proportion to obtain a finished product.

Example 2

An anti-erosion wear-resistant ceramic spray coating for a rotary kiln is prepared by the following steps:

(1) putting 82% of fused zirconia, 12% of fused chromic oxide and 6% of alumina ultrafine powder into a forced stirrer in sequence, mixing and stirring for 3min to obtain mixed powder, and taking out for later use;

(2) adding 57% by mass of industrial phosphoric acid, 34% by mass of water and 9% by mass of aluminum hydroxide powder into a container in proportion, keeping the temperature at 59 ℃, stirring for 25-45 minutes, taking out after reacting into transparent colloid, and cooling to normal temperature for later use;

(3) and uniformly stirring the bonding agent with the mass fraction of 34% and the mixed powder with the mass fraction of 66% in proportion to obtain a finished product.

Example 3

An anti-erosion wear-resistant ceramic spray coating for a rotary kiln is prepared by the following steps:

(1) putting 81% of fused zirconia, 14% of fused chromic oxide and 5% of alumina ultrafine powder in a forced stirrer in sequence, mixing and stirring for 3min to obtain mixed powder, and taking out for later use;

(2) adding 55 mass percent of industrial phosphoric acid, 34 mass percent of water and 11 mass percent of aluminum hydroxide powder into a container in proportion, keeping the temperature at 48 ℃, stirring for 25-45 minutes, taking out after reacting into transparent colloid, and cooling to normal temperature for later use;

(3) and uniformly stirring the binding agent with the mass fraction of 44% and the mixed powder with the mass fraction of 56% according to a proportion to obtain a finished product.

The finished rotary kiln anti-erosion wear-resistant ceramic spray coating has the following properties:

1. standard of detection method

The application adopts the following standard conical pairs to prepare Al of the anti-erosion wear-resistant ceramic spray coating for the finished rotary kiln₂O₃、Cr₂O₃、Zr₂O₃The refractoriness, the high-temperature bending strength and the line change after burning are detected:

(1) the content of the alumina in the anti-corrosion wear-resistant ceramic spray coating for the rotary kiln is determined according to a zinc acetate back-titration EDTA volumetric method in the determination of GB/T5070-2015 alumina;

(2) the content of chromium oxide is measured according to an acid dissolution method in the measurement of GB/T5070-2015 chromium trioxide;

(3) the content of zirconium oxide is measured by an EDTA volumetric method in GB/T5070-2015 measurement of zirconium (hafnium) oxide;

(4) the refractoriness of the spray paint is tested according to a test method of the refractoriness of a GB/T7322-2017 refractory material;

(5) the application tests the high-temperature rupture strength of the anti-erosion wear-resistant ceramic spray coating for the rotary kiln according to a high-temperature rupture strength detection method of GB/T3002-2017 refractory bricks;

(6) the method tests the line change after burning according to the GB/T5988-2007 refractory material heating permanent line change test method.

2. The performance of the anti-erosion wear-resistant ceramic spray coating for the rotary kiln is determined by selecting a finished product in the manner of the application, and the result is shown in table 1:

table 1 various performance parameters of the finished product of the present application

As can be seen from the table 1, the anti-erosion wear-resistant ceramic spray coating for the rotary kiln has better refractoriness under a high-temperature condition, high-temperature bending resistance is strong, and the expansion rate after burning is small.

The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the present application, and all equivalent variations and modifications within the scope of the present application are intended to be covered by the present application. Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.