阅读说明：本技术 一种预砌筑的碳化硅质耐火泥浆 (Silicon carbide refractory mortar for prebuilt construction ) 是由 邵荣丹 何见林 魏建修 丛培源 于 2021-09-08 设计创作，主要内容包括：本发明公开了一种预砌筑的碳化硅质耐火泥浆,其特征在于组成按重量百分数计如下：碳化硅0.5-0mm10-35％；碳化硅0.044-0mm30-50％；碳化硅抽尘粉6-23％；氮化硅粉3-10％；单质硅粉1-4％；氧化铝微粉1-6％；反应抑制剂1-2％；铝酸钙水泥2-4％；在以上基础上外加占比35-42wt％的磷酸二氢铝溶液；本发明提供的碳化硅质耐火泥浆常温下即可固化,产生较高的粘结强度,使砖砌体成为牢固整体,再通过机械将牢固粘结的砖砌体吊装到其使用位置,避免了现场作业人员必须在狭窄的作业空间内砌砖,提高了工作效率和施工质量,保证了施工作业的安全性。(The invention discloses a prebuilt silicon carbide refractory mortar which is characterized by comprising the following components in percentage by weight: 0.5-0mm 10-35% of silicon carbide; 0.044-0mm 30-50% of silicon carbide; 6-23% of silicon carbide dust-extraction powder; 3-10% of silicon nitride powder; 1-4% of elemental silicon powder; 1-6% of alumina micro powder; 1-2% of a reaction inhibitor; 2-4% of calcium aluminate cement; on the basis of the above, adding 35-42 wt% of aluminum dihydrogen phosphate solution; the silicon carbide refractory mortar provided by the invention can be cured at normal temperature to generate higher bonding strength, so that the brick masonry becomes a firm whole, and the firmly bonded brick masonry is hoisted to the use position through machinery, so that field operators are prevented from building bricks in a narrow operation space, the working efficiency and the construction quality are improved, and the safety of construction operation is ensured.)

1. The prebuilt silicon carbide refractory mortar is characterized by comprising the following components in percentage by weight:

on the basis of the above, 35-42 wt% of aluminum dihydrogen phosphate solution is added.

2. The silicon carbide refractory slurry according to claim 1, wherein the silicon carbide refractory slurry has a particle size distribution of 0.5 to 0mm and a particle size distribution of 0.044 to 0mm in each of 0.5 to 0mm and 0.044 to 0mm, and the silicon carbide content is not less than 90 wt%.

3. The silicon carbide refractory mortar of claim 1, wherein the dust-extracted silicon carbide powder is derived from a waste dust collected during the production of silicon carbide, the silicon carbide content is not less than 95 wt%, and the particle size is not more than 20 μm.

4. The silicon carbide-based refractory mortar of claim 1, wherein the silicon nitride powder has a particle size of 0.088-0mm and a silicon nitride content of 95 wt.% or more.

5. The silicon carbide refractory mortar of claim 1, wherein the elemental silicon powder has a particle size of 0.088 to 0mm and a silicon content of 98 wt% or more.

6. The silicon carbide refractory mortar of claim 1, wherein the alumina content in the alumina micropowder is not less than 99 wt%, and d50 is not more than 2.5 μm.

7. The silicon carbide refractory slurry of claim 1 wherein the aluminum dihydrogen phosphate solution is formed by reacting concentrated phosphoric acid with aluminum hydroxide, and the concentration of the solution is not less than 1.20 g/ml.

8. The silicon carbide refractory slurry of claim 1 wherein the reaction inhibitor is hexadecylamine.

Technical Field

The invention belongs to unshaped refractory materials, and particularly relates to silicon carbide refractory mortar for prebuilt construction.

Background

The silicon carbide slurry is mainly used for building silicon carbide bricks in industrial kilns. In the current infrastructure of industrial kilns such as domestic blast furnace hot blast stoves, because of the space restriction of the position of refractory mortar use, the operation personnel can't construct safely and efficiently, in order to guarantee the construction quality, improve the efficiency of construction, adopted and built the carborundum brick on the ground, after the carborundum brick that waits to build forms firm whole through the mud bonding, adopt machinery to hoist to the corresponding position of blast furnace body and install. Therefore, it is necessary to develop a special silicon carbide slurry, which not only has the functions of the traditional slurry, but also has the advantages of being capable of being dried and hardened quickly at normal temperature, generating high bonding strength in the hardening process, and bonding the silicon carbide bricks together into a firm whole.

Disclosure of Invention

The invention aims to provide silicon carbide refractory mortar which can be integrally hoisted after being prebuilt, the refractory mortar does not need to be stranded, can be immediately constructed after being stirred, has longer construction time, can be quickly hardened at normal temperature after being bricked, generates higher normal-temperature bonding strength, meets the requirement of on-site hoisting, and improves the construction efficiency and the safety; the slurry meets the requirements of higher high-temperature bonding strength and better high-temperature service performance under the high-temperature service condition.

In order to achieve the purpose, the technical scheme is as follows:

the prebuilt silicon carbide refractory mortar comprises the following components in percentage by weight:

on the basis of the above, 35-42 wt% of aluminum dihydrogen phosphate solution is added.

According to the scheme, the adopted particle size distribution ranges of 0.5-0mm of silicon carbide and 0.044-0mm of silicon carbide are respectively 0.5-0mm and 0.044-0mm, and the content of the silicon carbide is more than or equal to 90 wt%.

According to the scheme, the silicon carbide dust-extraction powder is derived from waste smoke dust collected in the process of producing silicon carbide, the content of silicon carbide is more than or equal to 95 wt%, and the granularity is less than or equal to 20 um.

According to the scheme, the particle size range of the silicon nitride powder is 0.088-0mm, and the content of silicon nitride is more than or equal to 95 wt%.

According to the scheme, the particle size range of the elemental silicon powder is 0.088-0mm, and the silicon content is more than or equal to 98 wt%.

According to the scheme, the content of alumina in the alumina micro powder is more than or equal to 99 wt%, and the d50 is less than or equal to 2.5 um.

According to the scheme, the aluminum dihydrogen phosphate solution is generated by the reaction of concentrated phosphoric acid and aluminum hydroxide, and the concentration of the solution is more than or equal to 1.20 g/ml.

According to the scheme, the reaction inhibitor is hexadecylamine.

The superfine silicon carbide dust-extraction powder is added into the silicon carbide refractory mortar, so that the silicon carbide content of the refractory mortar is improved, and the workability of the mortar is improved.

The alumina micro powder can play roles in enhancing the compactness of the slurry and improving the strength in the refractory slurry, and in the silicon carbide slurry, the alumina micro powder can react with silicon dioxide generated by the oxidation of silicon carbide and silicon dioxide generated by the oxidation of simple substance silicon at high temperature to generate mullite network-shaped distribution in the refractory slurry, thereby being beneficial to improving the high-temperature strength and the compactness of the refractory slurry.

The simple substance silicon can obviously react to form silicon nitride at the temperature of more than 600 ℃ in a pure nitrogen environment. The simple substance silicon is easy to be oxidized at high temperature, and in the use process of the silicon carbide slurry, the simple substance silicon is reacted with contacted hot air in preference to the silicon carbide to generate silicon dioxide and silicon nitride, and the silicon dioxide and the silicon nitride cover the surface of a masonry gap to resist further erosion and expansion of the masonry gap, so that the effects of resisting oxidation and improving the material strength are achieved.

The calcium aluminate cement mainly cures the silicon carbide slurry at normal temperature, generates higher normal-temperature bonding strength, realizes integral hoisting of the masonry, and improves construction efficiency and quality.

The reaction inhibitor hexadecylamine has polar groups, can be quickly attached to the surface of metal to form a layer of compact film, and protects the surface of the metal from being corroded. The reaction of aluminum dihydrogen phosphate and impurity iron in the raw materials is inhibited in the refractory slurry, and the problem that the stirred slurry is easy to swell and dry on site to cause incapability of construction is effectively avoided.

Compared with the prior art, the invention has the beneficial effects that:

the silicon carbide refractory mortar provided by the invention can be cured at normal temperature, generates higher bonding strength, enables the brick masonry to be a firm whole, and then mechanically hoists the firmly bonded brick masonry to the use position. The method avoids the situation that field operators need to build bricks in a narrow operation space, improves the working efficiency and the construction quality, and ensures the safety of construction operation.

More silicon carbide dust-extraction powder waste is added into the silicon carbide slurry, the dust-extraction powder has fine granularity and high silicon carbide content, is beneficial to saving resources, and is beneficial to improving the workability of the slurry and increasing the silicon carbide content when being used in the refractory slurry.

The reaction inhibitor is added into the slurry, thereby effectively inhibiting the bulging of the slurry and improving the construction performance of the slurry.

Detailed Description

The following examples further illustrate the technical solutions of the present invention, but should not be construed as limiting the scope of the present invention.

The raw materials used in the specific embodiment:

the grain size distribution ranges of 0.5-0mm of silicon carbide and 0.044-0mm of silicon carbide are respectively 0.5-0mm and 0.044-0mm, and the content of the silicon carbide is more than or equal to 90 wt%.

The silicon carbide dust-extraction powder is derived from waste smoke dust collected in the process of producing silicon carbide, the content of the silicon carbide is more than or equal to 95 wt%, and the granularity is less than or equal to 20 um.

The granularity range of the silicon nitride powder is 0.088-0mm, and the content of the silicon nitride is more than or equal to 95 wt%.

The granularity range of the elemental silicon powder is 0.088-0mm, and the silicon content is more than or equal to 98 wt%.

The content of alumina in the alumina micro powder is more than or equal to 99wt percent, and the d50 is less than or equal to 2.5 um.

The aluminum dihydrogen phosphate solution is generated by the reaction of concentrated phosphoric acid and aluminum hydroxide, and the concentration of the solution is more than or equal to 1.20 g/ml.

The reaction inhibitor is a hexadecylamine and is sourced from the chemical technology ltd of the northHubei Shiteng.

Example 1

Providing a prebuilt silicon carbide refractory mortar, which comprises the following components in percentage by weight:

the results of the performance index test of the silicon carbide refractory mortar provided in this example are shown in table 1.

Example 2

Providing a prebuilt silicon carbide refractory mortar, which comprises the following components in percentage by weight:

the results of the performance index test of the silicon carbide refractory mortar provided in this example are shown in table 1.

Example 3

Providing a prebuilt silicon carbide refractory mortar, which comprises the following components in percentage by weight:

the results of the performance index test of the silicon carbide refractory mortar provided in this example are shown in table 1.

TABLE 1 Performance index testing of the silicon carbide based refractory slurries of examples 1-3

Table 1 shows that the silicon carbide refractory mortar provided by the embodiments 1-3 of the present invention is cured in the air at a temperature of 5 ℃ or higher for 1 day after masonry, the bonding strength reaches 3MPa or higher, and the bonding strength gradually increases with the increase of the curing time, so that the requirements of on-site hoisting can be satisfied.

Example 4

A prebuilt silicon carbide refractory mortar comprises the following components in percentage by weight:

the results of the performance index test of the silicon carbide refractory mortar provided in this example are shown in Table 2.

Example 5

The pre-built silicon carbide refractory mortar consists of the following components in percentage by weight:

the results of the performance index test of the silicon carbide refractory mortar provided in this example are shown in Table 2.

Example 6

The pre-built silicon carbide refractory mortar consists of the following components in percentage by weight:

the results of the performance index test of the silicon carbide refractory mortar provided in this example are shown in Table 2.

Comparative example

The pre-built silicon carbide refractory mortar consists of the following components in percentage by weight:

TABLE 2 Performance index testing of silicon carbide-based refractory slurries of examples 4-6 and comparative examples

Table 2 shows that the comparative example, in which no reaction inhibitor was added, had very low cohesive strength, and that after the stirred slurry was left in the air for half an hour, it was clearly observed that the slurry became very dry and difficult to apply, and that there were many bubbles in the slurry, and the slurry swelled like fermented dough. The method is mainly characterized in that the reaction of impurity iron and the like in the slurry and the aluminum dihydrogen phosphate solution is an exothermic reaction, water is consumed in the reaction, gas is generated, the construction performance of the slurry is deteriorated, and the built masonry has low strength and even no strength. The silicon carbide refractory mortar provided by the embodiments 4-6 of the invention can be immediately used for masonry construction without ageing after being stirred, and can keep good construction performance for 8 hours, the bonding strength of the silicon carbide refractory mortar reaches more than 3MPa after being maintained in the air for 1 day at the temperature of more than 5 ℃, and the bonding strength of the silicon carbide refractory mortar gradually increases along with the prolonging of the maintenance time, so that the requirement of on-site hoisting can be met.