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Rod-shaped aggregate for lightweight castable and preparation method thereof

A lightweight castable, rod-shaped technology, applied in the field of refractory materials, can solve the problems of inability to prepare small-sized aggregate lightweight castables, time-consuming, large water demand, etc., achieve excellent volume stability and thermal shock stability, reduce Production cost, the effect of improving production efficiency

Active Publication Date: 2020-11-17
郑州市裕丰耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the commonly used methods for preparing aggregates for lightweight castables are organic pressing molding, casting molding, etc.; in these preparation methods, it is impossible to prepare aggregate particles with a specific shape and small size, and aggregate particles with a large size cannot be qualified. Therefore, it is impossible to prepare small-sized aggregates with excellent performance and lightweight castables with excellent performance under the conditions of the existing preparation methods
The aggregate particles prepared during the machine press molding preparation process are relatively large (blocks with a minimum diameter of 20-30 mm), and in order to obtain particles with smaller particle sizes, the prepared large particles need to be crushed after firing. The shape of the particles cannot be controlled during the process, and the particles obtained by crushing are very uneven (and have multiple sharp edges and corners); during the preparation process of casting molding, it is difficult to form aggregates with too small a size, and in the casting molding In the process, separate molds are required to be formed one by one, which requires a large amount of water, low body strength, and easy damage when demoulding after preparation and forming, resulting in low pass rate of finished products and waste of mold raw materials and product raw materials; produced by molds one by one The whole process is intermittent, and continuous production cannot be realized; a set of molds can only be used once in general, and the molds must be replaced continuously during the intermittent production process, which not only greatly increases the production cost of the mold, but also makes it difficult to realize automatic production. Manual disassembly and assembly are required, and the mold installation time in the whole preparation process is much longer than the aggregate sample preparation time, which is time-consuming, laborious, high production cost, and difficult to realize automatic continuous production

Method used

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  • Rod-shaped aggregate for lightweight castable and preparation method thereof
  • Rod-shaped aggregate for lightweight castable and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A rod-shaped aggregate for lightweight castables, which is prepared from the following raw materials in weight percentages:

[0038] Guangxi white clay with particle size ≤45μm: 75%

[0039] Alumina cement: 10%

[0040] Water glass: 10%

[0041] Calcium lignosulfonate: 5%

[0042]Add 0.2% of hydroxymethyl cellulose and 0.5% of sodium hexametaphosphate accounting for the total weight of the above raw materials.

[0043] The preparation method of the rod-shaped aggregate comprises the following steps:

[0044] (1) Prepare raw materials as required: 75% of Guangxi white mud with a particle size of ≤45 μm, 10% of alumina cement, 10% of water glass, 5% of calcium lignosulfonate; and sodium hydroxymethyl cellulose and sodium hexametaphosphate;

[0045] (2) The raw materials prepared in step (1) are added to the planetary mixer according to the required percentage of dosage and mixed, and stirred evenly to obtain the mixture;

[0046] (3) adding water accounting for 10% o...

Embodiment 2

[0051] A rod-shaped aggregate for lightweight castables, which is prepared from the following raw materials in weight percentages:

[0052] Guangxi white clay with particle size ≤45μm: 95%

[0053] Water glass: 3%

[0054] Calcium lignosulfonate: 2%

[0055] Add 0.2% sodium tripolyphosphate accounting for the total weight of the above raw materials, sodium hexametaphosphate accounting for 0.4% of the total weight of the above raw materials, and FDN accounting for 0.2% of the above raw materials.

[0056] The preparation method of the rod-shaped aggregate comprises the following steps:

[0057] (1) Prepare raw materials as required: 95% of Guangxi white mud with a particle size of ≤45 μm, 3% of water glass, 2% of calcium lignosulfonate; and sodium tripolyphosphate, sodium hexametaphosphate and FDN;

[0058] (2) The raw materials prepared in step (1) are added to the planetary mixer according to the required percentage of dosage and mixed, and stirred evenly to obtain the mix...

Embodiment 3

[0064] A rod-shaped aggregate for lightweight castables, which is prepared from the following raw materials in weight percentages:

[0065] Guangxi white clay with particle size ≤45μm: 85%

[0066] Water glass: 10%

[0067] Calcium lignosulfonate: 5%

[0068] Add 0.2% sodium hydroxymethyl cellulose that accounts for the total weight of the above-mentioned raw materials.

[0069] The preparation method of the rod-shaped aggregate comprises the following steps:

[0070] (1) Prepare raw materials according to requirements: 85% of Guangxi white mud with a particle size of ≤45 μm, 10% of water glass, 5% of calcium lignosulfonate; and sodium hydroxymethyl cellulose;

[0071] (2) The raw materials prepared in step (1) are added to the planetary mixer according to the required dosage ratio for mixing and stirring, and the stirring is uniform to obtain the mixture;

[0072] (3) adding water accounting for 15% of the total weight of the mixture in the mixture described in step (2), ...

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Abstract

The invention discloses rodlike aggregate for lightweight castable and a preparation method of the rodlike aggregate for lightweight castable. The preparation method includes: subjecting Guangxi whiteclay, a binding agent and a water reducing agent to dry mixing, then adding water, and mixing to obtain mixed paste; using a vacuum extruder to extrude the obtained mixed paste under conditions thatthe pressure is 1-2MPa, the vacuum degree ranges from -0.085MPa to -0.095MPa, and the temperature during extrusion is 15-25 DEG C so as to obtain a rodlike aggregate blank with the basic diameter being 0.6-3mm; drying and baking to obtain the rodlike aggregate for lightweight castable. By the preparation method, early-stage large-quantity mould preparation and continuous mould replacement processes are avoided, production cost is greatly reduced, production efficiency is increased by 3-5 times as compared with previous production efficiency, continuous automatic production is realized, low cost, low energy consumption and high efficiency are realized, and continuous batch production and high social and economic benefits are realized.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and relates to a rod-shaped aggregate for lightweight castables and a preparation method thereof, in particular to an aluminum-silicon rod-shaped aggregate for lightweight castables and a preparation method thereof. [0002] technical background [0003] The so-called lightweight refractory castables are made of lightweight refractory aggregates, powder, binders and admixtures. The performance of lightweight aggregates has a direct impact on the performance of castables. Lightweight castable is a kind of unshaped refractory material with high temperature resistance, low bulk density and low thermal conductivity. It has many advantages of refractory castable and lightweight refractory at the same time, and it has attracted more and more attention in high temperature industry. Lightweight castables have small volume density, large apparent porosity, low thermal conductivity, good heat i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/02E04C5/07
CPCC04B18/023E04C5/07C04B14/10C04B22/00C04B24/18C04B22/16C04B24/383C04B7/32C04B20/0008
Inventor 张会敏张景倚
Owner 郑州市裕丰耐火材料有限公司
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