Preparation method of dispersive aluminum oxide for castable and castable

A dispersive and alumina technology, applied in the field of refractory materials, can solve problems affecting construction performance, non-condensation phenomenon, and affecting demoulding strength, etc., and achieve the effects of improving constructability, reducing water addition, and low cost

Active Publication Date: 2015-06-17
浙江自立新材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the prior art, the setting time of the castable (that is, the construction time of the product) cannot be adjusted according to climate change. The setting time of the castable in summer is short, which affects the construction performance, and the setting time of the castable in winter is very long, and even occurs Non-condensation phenomenon affects the release strength

Method used

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  • Preparation method of dispersive aluminum oxide for castable and castable
  • Preparation method of dispersive aluminum oxide for castable and castable
  • Preparation method of dispersive aluminum oxide for castable and castable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0052] (1) Active α-Al 2 o 3 Alumina powder is obtained by ball milling in a corundum ball mill, active α-Al 2 o 3 Middle Al 2 o 3 The mass fraction ≥ 95wt%, the ball-to-material ratio and ball milling time are shown in Table 1.

[0053] According to the ball milling conditions shown in Table 1, the particle size of the obtained alumina powder satisfies D 50 ≤10μm, D 90 ≤20μm.

[0054] (2) Mix the alumina powder, water reducer and coagulation regulator to obtain dispersible alumina. Table 2 shows the weight ratio of alumina powder, water reducer and coagulation regulator.

[0055] Examples 1-3 adopt mechanical mixing. The ball-to-material ratio of Example 1 is 1:2.5, the ball-to-material ratio of Example 2 is 1:3, and the ball-to-material ratio of Example 3 is 1:5. Examples 1-3 The ball milling time is 5 hours.

[0056] Embodiment 4~6 adopts airflow mixing, and embodiment 4 is mixed at 300rpm rotating speed for 120s; Embodiment 5 is first mixed at 100rpm rotating spee...

Embodiment 7

[0057] Examples 7-8 adopt spray granulation, dissolve alumina powder, water reducing agent and coagulation regulator in water to obtain raw material slurry, and then spray the raw material slurry into a granulation tower for drying and granulation. Example 7 The mass percentage of the solute in the raw material slurry is 70%; the mass percentage of the solute in the raw material slurry in Example 8 is 80%.

[0058] Table 1

[0059]

[0060] Table 2

[0061]

[0062]

[0063] In Table 2, X stands for retarded dispersible alumina, D stands for accelerated set dispersible alumina, and each example corresponds to a retarded disperse alumina and a set accelerated disperse alumina.

Embodiment 3

[0074] The microstructure photo of the dispersed alumina prepared in embodiment 3 is as follows figure 1 , figure 2 , image 3 It can be seen from the figure that in the dispersed alumina, the water reducer and the coagulation regulator are attached to the outer surface of the alumina particles.

[0075] Add the dispersible alumina prepared in each example to the castable, and use a fluidity tester to put the castable into the conical hopper of the detector. The size of the conical hopper is upper diameter / lower diameter / height = 70 / 100 / 60mm, the castable is poured into the conical hopper, the upper surface of the castable is flush with the upper end of the conical hopper, when the hopper is lifted, the castable automatically flows out and spreads, and the measurement is made when the spreading diameter of the castable reaches 170mm The amount of water added is used to characterize the water-reducing performance of dispersible alumina.

[0076] Table 4

[0077]

[007...

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Abstract

The invention discloses a preparation method of dispersive aluminum oxide for a castable. The method comprises the following steps: mixing aluminum oxide powder, a water reducing agent and a thickening time control agent to obtain the dispersive aluminum oxide, wherein the granularity of the aluminum oxide powder simultaneously meet the following formula requirements: D50 is smaller than or equal to 10 micrometers and D90 is smaller than or equal to 20 micrometers. The dispersive aluminum oxide is prepared from the following constituents in parts by weight: 60-95 parts of the aluminum oxide powder, 5-40 parts of the water reducing agent and 0-5 parts of the thickening time control agent. The preparation method provided by the invention is simple in technology and low in cost; the prepared dispersive aluminum oxide can uniformly disperse in the castable; the additive quantity of water in the castable can be obviously reduced; the coagulation performance of the castable can be effectively regulated; the constructability, anti-bleeding property and early strength of the castable are improved.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a method for preparing dispersible alumina used for castables and castables. Background technique [0002] In recent years, due to the advantages of high labor production efficiency, good adaptability, and low raw material consumption, unshaped refractory materials have developed rapidly, and their proportion in refractory materials has continued to expand. important sign. [0003] As an advanced country in the world's refractory technology, Japan took the lead in becoming the country whose output of unshaped refractories exceeded that of shaped refractories in 1992. At present, the output of unshaped refractories in Japan accounts for about 70% of the total refractory materials, about 50% in the United States, 40% to 50% in European countries such as Britain, Germany, and France, and about 30% in China. However, the total output of China's refractory materials exceeds 11 mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10
Inventor 宋雅楠赵义黄凯程文雍马铮沈明科方斌祥
Owner 浙江自立新材料股份有限公司
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