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Method for preparing compact calcium oxide sand

A technology of calcium oxide sand and calcium hydroxide, which is applied in the field of refractory material production, can solve the problems affecting the high temperature performance of refractory materials, high refiring temperature, energy consumption, etc., and achieve the effect of improving hydration resistance and reducing firing temperature

Inactive Publication Date: 2006-07-19
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low activity of calcium oxide in quicklime, a higher reburning temperature is required, generally above 1700°C, which causes a lot of energy consumption and increases production costs.
Although the addition of sintering flux can effectively promote sintering and reduce the calcination temperature by forming a low-melting point phase, the formation of a low-melting point phase will affect the high-temperature performance of the refractory

Method used

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  • Method for preparing compact calcium oxide sand
  • Method for preparing compact calcium oxide sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The calcium oxide sand is synthesized by a three-step process, and the process steps are as follows:

[0022] (1) Firstly, limestone is calcined to produce quicklime (same as traditional process).

[0023] (2) Prepare light calcium carbonate with quicklime as raw material. First, put quicklime into a sufficient amount of water at a temperature of 50°C, stir to make it fully dissolve and react with water to form a saturated solution of calcium hydroxide. Blow enough carbon dioxide gas into the solution to completely react calcium hydroxide to form calcium carbonate precipitate. The rate of blowing carbon dioxide gas is 300L / min (relative to 1000L saturated calcium hydroxide solution).

[0024] Then filter and dry the precipitate to obtain light calcium carbonate. Add an appropriate amount of additives to light calcium carbonate to inhibit the growth of calcium oxide grains. Magnesium oxide micropowder is selected as an additive, and its particle size is less than or ...

Embodiment 2

[0027] The calcium oxide sand is synthesized by a three-step process, and the process steps are as follows:

[0028] (1) Firstly, limestone is calcined to produce quicklime (same as traditional process).

[0029] (2) Prepare light calcium carbonate with quicklime as raw material. First put the quicklime into a sufficient amount of water with a temperature of 60°C, stir it to fully dissolve and react with water to form a saturated solution of calcium hydroxide. Blow enough carbon dioxide gas into the solution to completely react calcium hydroxide to form calcium carbonate precipitate. The rate of blowing carbon dioxide gas is 500L / min (relative to 1000L saturated calcium hydroxide solution).

[0030] Then filter and dry the precipitate to obtain light calcium carbonate. Add an appropriate amount of additives to light calcium carbonate to inhibit the growth of calcium oxide grains. Magnesium oxide micropowder is selected as an additive, and its particle size is less than or ...

Embodiment 3

[0033] The calcium oxide sand is synthesized by a three-step process, and the process steps are as follows:

[0034] (1) Firstly, limestone is calcined to produce quicklime (same as traditional process).

[0035] (2) Prepare light calcium carbonate with quicklime as raw material. First put quicklime into a sufficient amount of water at a temperature of 30°C, stir to make it fully dissolve and react with water to generate a saturated solution of calcium hydroxide. Blow enough carbon dioxide gas into the solution to completely react calcium hydroxide to form calcium carbonate precipitate. The rate of blowing carbon dioxide gas is 50L / min (relative to 1000L saturated calcium hydroxide solution).

[0036] Then filter and dry the precipitate to obtain light calcium carbonate. Add an appropriate amount of additives to light calcium carbonate to inhibit the growth of calcium oxide grains. Magnesium oxide micropowder is selected as an additive, and its particle size is less than o...

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Abstract

The three-step preparation method for CaO sand comprises: first, calcining the limestone for CaO and then the light CaCO3; adding 0.1-5% micro-powder of MgO or ZrO2 with size <=3 mu m into the light CaCO3 to mix evenly and briquette; then, re-calcining for 2-5h at 1200-1600 DEG C, natural cooling to normal temperature, and obtaining the sand. This invention decreases fire temperature obviously, and improves the product property without low-melting point phase.

Description

technical field [0001] The invention belongs to the technical field of refractory material production, and in particular relates to a preparation method of dense calcium oxide sand. Background technique [0002] In addition to the high melting point, balanced oxygen partial pressure and low vapor pressure of calcium oxide sand, limestone, the natural raw material for the production of calcium oxide sand, is rich in resources all over the world. In addition, as a refractory material for metallurgical industry, calcareous refractory material has a good effect of removing impurities such as phosphorus and sulfur in molten steel. Therefore, calcium oxide refractory materials have always been considered as a high-quality refractory material with development prospects. However, due to the strong water absorption of calcium oxide, it is easy to digest and react with the moisture in the air to crack or pulverize the refractory material, which brings great problems to the storage an...

Claims

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Application Information

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IPC IPC(8): C04B35/057C04B35/64C04B35/66
Inventor 陈敏王楠于景坤姜茂发
Owner NORTHEASTERN UNIV
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