Preparation method of MgO-CaO-ZrO2 sand

A sand ball and drying technology, applied in zirconia and other directions, can solve the problems of difficulty in production, storage and application, easy hydration, etc. Effect

Inactive Publication Date: 2020-07-14
海城市军刚中档镁砂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After calcined at high temperature, the MgO-CaO sand exposes a new surface and is easy to hydrate, which brings great difficulties to production, storage and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 100kg of MgO-CaO powder and 10kg of Zr(OH) with a concentration of 1mol / L 4 The sol is placed in a mixer and mixed for 20 minutes to obtain MgO-CaO-ZrO 2 Material; MgO-CaO-ZrO 2 Put the material into the ball press machine and press it into MgO-CaO-ZrO with a diameter of 40mm at 60MPa 2 Sand balls; MgO-CaO-ZrO 2 Place sand balls at 110°C for 10 hours to obtain dry MgO-CaO-ZrO 2 Sand balls; dry MgO-CaO-ZrO 2 Sand balls are calcined in a kiln at 1500°C for 3 hours to obtain MgO-CaO-ZrO 2 sand.

[0020] After testing the MgO-CaO-ZrO prepared in this example 2 Sand: CaO content is 40wt%, MgO content is 50wt%, bulk density is 2.7g / cm 3 ; After being kept at 50°C and 90% humidity for 10 hours, after drying at 110°C, the hydration weight gain rate of the green body is 1.5%; the thermal shock resistance of MgO-CaO refractories reaches 12 times.

Embodiment 2

[0022] 100kg of MgO-CaO powder and 15kg of Zr(OH) with a concentration of 1mol / L 4 The sol is placed in a mixer and mixed for 20 minutes to obtain MgO-CaO-ZrO 2 Material; MgO-CaO-ZrO 2 Put the material into the ball press machine and press it into MgO-CaO-ZrO with a diameter of 40mm at 70MPa 2 Sand balls; MgO-CaO-ZrO 2 Place sand balls at 110°C for 12 hours to obtain dry MgO-CaO-ZrO 2 Sand balls; dry MgO-CaO-ZrO 2 The sand balls are calcined in a kiln at 1600°C for 4 hours to obtain MgO-CaO-ZrO 2 sand.

[0023] After testing the MgO-CaO-ZrO prepared in this example 2 Sand: CaO content 43wt%, MgO content 46wt%, bulk density 2.9g / cm 3 ; After being kept at 50°C and 90% humidity for 10 hours, after drying at 110°C, the hydration weight gain rate of the green body is 1.0%; the thermal shock resistance of MgO-CaO refractories reaches 15 times.

Embodiment 3

[0025] 100kg of MgO-CaO powder and 20kg of Zr(OH) with a concentration of 1mol / L 4 The sol is placed in a mixer and mixed for 20 minutes to obtain MgO-CaO-ZrO 2 Material; MgO-CaO-ZrO 2 Put the material into the ball press machine and press it into MgO-CaO-ZrO with a diameter of 40mm at 80MPa 2 Sand balls; MgO-CaO-ZrO 2 The sand balls are placed at 110°C for 15 hours until the water content is lower than 1%, and the dried MgO-CaO-ZrO 2 Sand balls; dry MgO-CaO-ZrO 2 The sand balls are calcined in a kiln at 1800°C for 5 hours to obtain MgO-CaO-ZrO 2 sand.

[0026] After testing the MgO-CaO-ZrO prepared in this example 2 Sand: CaO content is 38wt%, MgO content is 46wt%, bulk density is 3.1g / cm 3 ; After being kept at 50°C and 90% humidity for 10 hours, after drying at 110°C, the hydration weight gain rate of the green body is 0.5%; the thermal shock resistance of MgO-CaO refractories reaches 19 times.

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Abstract

The invention relates to a preparation method of MgO-CaO-ZrO2 sand. The preparation method comprises the following steps: carrying out heat treatment on dolomite ore and magnesite ore, hydrating, sieving with a 0.2 mm sieve, drying a filter body obtained by sieving, and grinding to 200 meshes or below to obtain MgO-CaO2 powder; placing MgO-CaO powder and Zr(OH)4 sol in a mixer to be evenly mixed,conducting ball pressing after mixing, and drying till the moisture is smaller than 1%; and finally, placing the mixture in a kiln to be calcined, and obtaining the MgO-CaO-ZrO2 sand. The MgO-CaO-ZrO2sand prepared by the preparation method disclosed by the invention is good in hydration resistance, high in refractoriness, high in thermal stability and strong in alkaline slag corrosion resistance,has a purification effect on molten steel, and is an ideal raw material for preparing high-grade materials such as magnesium-calcium refractory materials and ceramics.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a MgO-CaO-ZrO 2 Sand preparation method. Background technique [0002] MgO-CaO refractories have good high temperature stability and slag resistance, especially the free CaO can purify molten steel. Therefore, MgO-CaO refractories are widely used in AOD refining ladles. However, calcium-containing materials are easily hydrated to form Ca(OH) 2 It causes volume expansion, which in turn leads to material damage, which limits the use of MgO-CaO materials to a large extent. [0003] At present, MgO-CaO sand produced from dolomite is calcined from dolomite raw material at about 1000°C, which is the first step product when MgO-CaO sand is calcined by two-step calcination method. The bulk density of lightly burned MgO-CaO sand is very low, only 1.45g / cm 3 about. Sintered MgO-CaO sand is a product obtained by sintering dolomite powder at 1700-1800°C. There are t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C04B2/02C04B2/00C01G25/02C04B35/66
CPCC04B2/10C04B2/02C04B2/00C01G25/02C04B35/66
Inventor 刘士军罗旭东杨孟孟周晓蕾
Owner 海城市军刚中档镁砂有限公司
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