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A kind of retarding type composite water reducer for refractory castable containing silica fume and preparation method thereof

A technology of refractory castables and composite water reducers, applied in the field of refractory castables, can solve the problems of castable construction time (short initial setting time, frequent occurrence of castable construction problems, high-temperature performance damage of castables, etc.), and achieve significant reduction Water efficiency, strong applicability, and high water reduction efficiency

Active Publication Date: 2022-06-24
苏州盛曼特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher surface area and the presence of higher alkaline impurities can easily lead to a shorter construction time (initial setting time) of the castable, especially in summer or under higher construction temperature conditions, resulting in higher The construction problems of castables of silica fume system occur frequently
[0004] Although traditional water reducers such as sodium tripolyphosphate and sodium hexametaphosphate can achieve dispersion and water reduction, however, the amount of water required for castables is still relatively high, and it often occurs that castables have insufficient construction time at higher temperatures. lead to construction failure
Ultimately, the high temperature performance of castables containing silica fume will be damaged to varying degrees

Method used

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  • A kind of retarding type composite water reducer for refractory castable containing silica fume and preparation method thereof
  • A kind of retarding type composite water reducer for refractory castable containing silica fume and preparation method thereof
  • A kind of retarding type composite water reducer for refractory castable containing silica fume and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Activated alumina powder (Al 2 O 3 Content = 99.4%, BET = 3.1m 2 / g, water content=0.12%, Luoyang Lier Functional Materials Co., Ltd.), sodium hexametaphosphate (pH=6.3, total phosphate (with P 2 O 5 total) content = 69%, inactive phosphate (in P 2 O 5 total) content = 7.3%, water insoluble content = 0.01%, Wuhan Liande Chemical Co., Ltd.), melamine (pH value = 8.1, water content = 4.3%, Cl - Content = 0.3%, powder, Jiangsu Zhaojia Building Materials Technology Co., Ltd.), anhydrous citric acid (purity = 98.2%, powder, Weifang Yingxuan Industrial Co., Ltd.), tartaric acid (left-handed, purity = 95.3%, Hubei Hengjing Rui Chemical Co., Ltd.) according to the mass ratio of 50:13:25:6:6 to make the mixture M1-1; Type), the mixing speed was set to 90 rpm, and the mixing time was 20 minutes to prepare a well-mixed retarded composite water-reducing agent.

[0038] The retarding type composite water-reducing agent of this embodiment is used as the raw material for prepar...

Embodiment 2

[0045] Activated alumina micropowder (same as Example 1), sodium hexametaphosphate (same as Example 1), melamine (same as Example 1), anhydrous citric acid (same as Example 1), tartaric acid (same as Example 1) according to quality The ratio of 50: 13: 25: 5: 4 was mixed to obtain the mixture M1-2; then, the M1-2 mixture was placed in a high-performance mixer (EIRICH brand, RV24 type), and the mixing speed was set The mixing time is 100 rpm, and the mixing time is 20 minutes to prepare a well-mixed composite water-reducing agent.

[0046]Investigate the performance of the castable containing the composite water-reducing agent of this example under high temperature conditions with reference to Example 1: under the condition of 35 ° C, when the addition of the water-reducing agent is 0.4%, the water addition of the castable is 4.6%, and the construction time is 115 minutes, the overall construction performance is good.

Embodiment 3

[0048] Activated alumina micropowder (same as Example 1), sodium hexametaphosphate (same as Example 1), melamine (same as Example 1), anhydrous citric acid (same as Example 1), tartaric acid (same as Example 1) according to quality The ratio of 50: 10: 30: 6: 4 was mixed to obtain the mixture M1-3; the M1-3 mixture was placed in a high-performance mixer (EIRICH brand, RV24 type), and the mixing speed was set to 100 rev / min, and the mixing time is 20 minutes to prepare a compound water reducing agent that is mixed evenly.

[0049] Investigate the performance of the castable containing the composite water-reducing agent of this embodiment under high temperature conditions with reference to Example 1: under the condition of 35 ° C, when the addition of the water-reducing agent is 0.4%, the water addition of the castable is 4.2%, and the construction time is 105 minutes, the overall construction performance is good.

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Abstract

The invention discloses a slow-setting composite water reducer for refractory castables containing silica fume, which is made of activated alumina micropowder, sodium hexametaphosphate, melamine water reducer, anhydrous citric acid and L-tartaric acid as raw materials The mass ratio of activated alumina micropowder, sodium hexametaphosphate, melamine superplasticizer, anhydrous citric acid and L-tartaric acid is 50:10~15:20~30:3~6:4~7. The present invention fully considers the dispersion of sodium hexametaphosphate to α-alumina micropowder and the dispersion of melamine and anhydrous citric acid to silica micropowder, and simultaneously utilizes the water-reducing and retarding effects of L-tartaric acid and anhydrous citric acid. The composite water reducing compound of the present invention has the characteristics of high water reducing efficiency, strong applicability, and excellent high-temperature retarding performance, and can solve technical problems such as too fast condensation and short construction time of castables in field construction under high temperature conditions.

Description

technical field [0001] The invention belongs to the field of refractory castables, relates to a comprehensive product of the interdisciplinary fields of inorganic chemistry and organic polymer materials, and in particular relates to a retarded composite water-reducing agent for silica fume-containing refractory castables and a preparation method thereof. In particular, it relates to a water reducing agent specially used for refractory castables containing high silica fume content (≥1%) and having a high temperature retarding effect and a preparation method thereof. Background technique [0002] Water reducing agent is an indispensable admixture for refractory castables to complete construction and provide later high temperature performance. role is crucial. At present, the castables containing high silica fume systems, such as iron trench castables in blast furnace tapping systems, corundum self-flowing castables in precision casting, ladle and tundish permanent layer casta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/63C04B35/632C04B35/634C21B7/14B22D41/02
CPCC04B35/66C04B35/6303C04B35/632C04B35/6348C21B7/14B22D41/02C04B2235/3217
Inventor 张举张兰银
Owner 苏州盛曼特新材料有限公司
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