阅读说明：本技术 一种高温性能优良的硅质耐火泥浆 (Silica refractory mortar with excellent high-temperature performance ) 是由 邵荣丹 何见林 于 2020-04-30 设计创作，主要内容包括：本发明公开了一种高温性能优良的硅质耐火泥浆,其粉料组成按质量百分数计如下：废硅砖粉0.5-0mm,20～50％；石英粉0.3-0mm,15～35％；石英粉0.088-0mm,25～45％；碳化硅抽尘粉1～3％；二氧化硅微粉1～3％；糊精1～1.5％；羧甲基纤维素0.1～0.5％；矿化剂0.05～0.2％；外加占粉料27～30wt％的水混合而成。本发明提供的硅质耐火泥浆二氧化硅含量大于等于94％,不添加生粘土,钠膨润土等,氧化铝含量低,低熔物含量低,荷重软化温度点高。同时,添加废硅砖粉,实现了资源二次利用,且废硅砖粉基本以磷石英相存在,体积稳定性好,与所砌硅砖材质匹配,高温使用环境中粘结好,不脱面。(The invention discloses a silica refractory mortar with excellent high-temperature performance, which comprises the following powder components in percentage by mass: 0.5-0mm of waste silicon brick powder, 20-50%; 0.3-0mm of quartz powder, 15-35%; 0.088-0mm of quartz powder, 25-45 percent; 1-3% of silicon carbide dust-extraction powder; 1-3% of silica micropowder; 1-1.5% of dextrin; 0.1-0.5% of carboxymethyl cellulose; 0.05-0.2% of a mineralizer; and water accounting for 27-30 wt% of the powder is added and mixed. The silica content of the silica refractory mortar provided by the invention is more than or equal to 94%, no raw clay, sodium bentonite and the like are added, the alumina content is low, the low-melting-point content is low, and the refractoriness under load is high. Meanwhile, the waste silicon brick powder is added, so that the secondary utilization of resources is realized, the waste silicon brick powder basically exists in a phosphorus quartz phase, the volume stability is good, the waste silicon brick powder is matched with the material of the laid silicon brick, the adhesion is good in a high-temperature use environment, and the surface is not broken.)

1. The silica refractory mortar with excellent high-temperature performance is characterized in that the powder comprises the following components in percentage by mass:

2. the silica refractory mortar of claim 1, wherein the main phases of the waste silica bricks are a phosphosilicate phase derived from defective shapes or cracks of the fired silica bricks and from defective products having a satisfactory chemical composition, and silica bricks removed from industrial kilns such as coke ovens and hot blast furnaces, and the silica bricks are sorted and crushed into particles having a particle size of 0.5 to 0mm, wherein SiO is SiO₂Content (wt.)Greater than 94 wt%.

3. The silica refractory slurry having excellent high-temperature characteristics as claimed in claim 1, wherein the silica powder is a high-purity silica sand containing SiO as an uncalcined component₂The content is more than or equal to 98.5wt percent.

4. The silica refractory mortar of claim 1, wherein the dust-removing powder is a dust waste collected during the production of silicon carbide, the particle size of the dust-removing powder is less than or equal to 20 μm, and the content of silicon carbide is greater than or equal to 95 wt%.

5. The silica refractory mortar of claim 1, wherein the fine silica powder is a high-purity ultrafine powder having a silica content of 99 wt% or more and a particle size d50 of about 0.15 μm.

6. The silica refractory mortar of claim 1, wherein the dextrin is a yellow dextrin having a cohesive strength of greater than 1.8kg/cm²The solubility in water at 15-17 ℃ is more than 96%.

7. The silica refractory mortar of claim 1, wherein the carboxymethyl cellulose has a cellulose content of 97.5 wt% or more.

8. The silica refractory mortar of claim 1 having excellent high temperature properties wherein the mineralizer is a combination of mill scale and borax; the iron scale powder is derived from scale-shaped objects formed by the oxidation and falling off of the surfaces of steel products in the heating and rolling processes, the particle size range is 0.044-0mm, and the mass ratio of the iron scale powder to borax is 1 (1-3).

Technical Field

The invention belongs to the technical field of materials, and particularly relates to silica refractory mortar with excellent high-temperature performance.

Background

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide the siliceous refractory mortar with high refractoriness under load and good high-temperature performance, which is free from clay, low in impurity content, high in refractoriness under load, good in high-temperature bonding performance and capable of meeting the long-term use of industrial kilns.

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

the silica refractory mortar with excellent high-temperature performance comprises the following powder components in percentage by mass:

and water accounting for 27-30 wt% of the powder is added and mixed.

According to the scheme, the main phases of the waste silica brick powder are a phosphorus quartz phase which is derived from defective shapes or cracks after silica brick firing and defective products with qualified chemical components, and silica bricks removed from industrial kilns such as coke ovens, hot blast furnaces and the like, and are sorted and crushed into particles with the particle size of 0.5-0mm, wherein SiO is SiO₂The content is more than 94 wt%.

According to the scheme, the quartz powder is high-purity quartz sand without calcination, and SiO is obtained₂The content is more than or equal to 98.5wt percent.

According to the scheme, the silicon carbide dust extraction powder is a smoke dust waste collected in the silicon carbide production process, the granularity is less than or equal to 20 mu m, and the content of silicon carbide is more than or equal to 95 wt%.

According to the scheme, the silicon dioxide micropowder is high-purity ultrafine micropowder with the silicon dioxide content of more than or equal to 99 wt% and the granularity d50 of about 0.15 um.

According to the scheme, the dextrin is yellow dextrin, and the binding power of the dextrin is more than 1.8kg/cm²The solubility in water at 15-17 ℃ is more than 96%.

According to the scheme, the cellulose content in the carboxymethyl cellulose is more than or equal to 97.5 wt%.

According to the scheme, the mineralizer is the combination of iron scale powder and borax; the iron scale powder is derived from scale-shaped objects formed by the oxidation and falling off of the surfaces of steel products in the heating and rolling processes, the particle size range is 0.044-0mm, and the mass ratio of the iron scale powder to borax is 1 (1-3).

The waste silica brick used in the invention is completely transformed in crystal form due to high-temperature calcination under strict temperature control, and the main crystal phase is a phosphorite phase, so that the volume stability is good, and the high-temperature performance is good.

The quartz powder used in the invention has low price, high refractoriness, high silicon dioxide content and less impurities, is a necessary raw material for preparing the silica refractory slurry, and because the slurry is composed of a large amount of fine powder, the slurry is easy to shrink after high-temperature sintering, and the shrinkage during sintering can be reduced by adding the quartz powder.

The silicon carbide dust-extraction powder used in the invention belongs to industrial waste, but the silicon carbide content is high, the granularity is superfine, loose dust-like accumulation is presented, and the workability of the silica refractory slurry is improved. And the silicon carbide has high heat conductivity coefficient, and is beneficial to improving the heat conductivity of the silica refractory mortar.

The silicon dioxide micropowder used in the invention has superfine granularity and good dispersibility, and can suspend refractory mortar in the silica refractory mortar, so that the refractory mortar has better workability and is not precipitated, and the content of silicon dioxide in the silica refractory mortar can be increased due to ultrahigh content of silicon dioxide. The sintering can be promoted at the medium-high temperature stage, and the slurry bonding strength is improved.

Dextrin acts to increase the workability of the refractory mortar and to increase the bond strength after baking.

The carboxymethyl cellulose plays a role in retaining water in the refractory mortar, increases the suspension property of the refractory mortar, ensures that the mortar has certain plasticity, and ensures that mortar joints are full.

The scale powder used in the invention is iron scale produced in the steel rolling process, and the main component of the scale powder is Fe₂O₃FeO and the like, the granularity is 0.044-0mm, and the TFe content is more than or equal to 90 wt%; borax, sodium borate, is a chemical agent that is readily soluble in water and has a relatively low melting point. The combination of the scaly iron powder and the boric acid is used as a mineralizer to promote sintering in the siliceous refractory slurry, so that raw quartz powder can start to be converted into a large amount of phosphorosilicate in the sintering process at a lower temperature, the volume stability of the siliceous slurry is favorably improved, and the formed phosphorosilicate is spearhead-shaped bicrystals which are staggered with each other, and the strength of the slurry is favorably improved.

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

the silica content of the silica refractory mortar provided by the invention is more than or equal to 94%, no raw clay, sodium bentonite and the like are added, the alumina content is low, the low-melting-point content is low, and the refractoriness under load is high.

The silicon carbide waste is added, so that the resource is saved, and the temperature conductivity of the silica refractory slurry is improved.

The waste silicon brick powder is added, so that the secondary utilization of resources is realized, the waste silicon brick powder basically exists in a phosphorus quartz phase, the volume stability is good, the waste silicon brick powder is matched with the material of the laid silicon brick, the adhesion is good in a high-temperature use environment, and the surface is not broken.

A certain amount of mineralizer is added in a compounding way, so that a large amount of quartz powder (the basic phase is beta-quartz) in the siliceous mud can be converted into tridymite phase at a lower temperature in the heating process, and cristobalite phase with larger volume expansion is not directly generated, and the refractory mud is favorable for not generating too large expansion in the high-temperature use process.

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.

In the following examples, the raw material indexes used are:

the particle size of the waste silicon brick powder is 0-0.5mm, and the SiO of the waste silicon brick powder₂The content was 94.5 wt%;

the particle size of the quartz powder is 0-0.3mm, and 0.088-0mm, SiO₂The content is 99 wt%;

the dust particle size of the silicon carbide is less than or equal to 20um, and the content of the silicon carbide is 95.2 wt%;

the average particle size of the silicon dioxide micro powder is about 0.15um, and the silicon dioxide content is 99.3 wt%;

the dextrin is yellow dextrin with binding power greater than 1.8kg/cm²The solubility in water at 15-17 deg.C is greater than 96%, and the acidity is less than 35%.

The mineralizer is formed by compounding or independently adding the iron scale powder and the borax. Wherein, the TFe content in the scaly iron powder is 93.5 percent.