Method for producing calcium oxide with marble as raw material

A calcium oxide, marble technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problem of not using marble, producing calcium oxide, etc.

Inactive Publication Date: 2008-08-20
曲玉珠
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Problems solved by technology

[0005] The invention solves the problem that the traditional calcination process c...

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specific Embodiment approach 1

[0006] Specific Embodiment 1: The method for producing calcium oxide in this embodiment is the same as the steps of material selection and calcination in the traditional production process, that is: to contain CaCO 3 The ore is used as raw material, and it is heated and calcined to generate CO 2 and CaO, but the specific practice in material selection and calcination process is: CaCO 3 Marble with a content of more than 95% and a whiteness of more than 92% is used as raw material, broken into 20-300mm 3 ; Load the ore into tunnel kiln, smoke pouring kiln, rolling plate kiln or drawer kiln instead of vertical kiln; use gas fuel or solid fuel to heat and calcinate, and finally enter the cooling section for cooling. Any of liquefied gas, natural gas, coal gas or coal gas generated gas can be used as the gas fuel.

[0007] 1. Adopt tunnel kiln: load the ore into the kiln car, preheat in the preheating section for 8 hours, and control the temperature at 100-600°C. Then enter the...

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Abstract

The invention discloses a method which takes marbles as raw materials for producing calcium oxide and relates to a production method of the calcium oxide. The marbles having the content of the CaCO3 that is more than 95 percent and the whiteness that is higher than 92 percent are chosen as the raw material, and the marbles are broken into 20 to 300mm<3>; the ores are put into a tunnel kiln, a puffing kiln, a rolling plate kiln or a drawer kiln and are preheated for 6 to 10 hours in a preheating section, and the temperature in controlled under 0 to 600 DEG C, and then the ores are put into a calcination section and are heated and calcined for 8 to 12 hours by gas fuels or solid fuels, and the temperature is controlled under 600 to 1100 DEG C, finally the ores are put into a cooling section to be cooled. The method for producing calcium oxide of the invention solves the problem that fuels and raw materials are mixed together so that the calcium oxide cannot be produced by marbles in the traditional calcining craft. Under the non-selection circumstance, the effective purity can be increased by 5 percent and the whiteness can be increased by 9 percent by using marbles for producing the calcium oxide.

Description

technical field [0001] The invention relates to a method for producing calcium oxide, in particular to a method for producing calcium oxide using marble as a raw material. Background technique [0002] The traditional method of producing calcium oxide is to use limestone as raw material, and the calcination process uses a shaft kiln, where limestone and solid fuel are mixed together or layered into the kiln for calcination. Adopt marble as raw material with this method, then in the calcination process 500~800 ℃ raw material is broken and can't be separated with fuel, ash after being mixed together. After calcium oxide is produced from limestone and selected, the effective calcium oxide can only reach about 90%, the whiteness can only reach about 86%, and the moisture absorption rate is reduced. Contents of the invention [0003] The purpose of the present invention is to provide a method for producing calcium oxide with marble as raw material, so as to overcome the proble...

Claims

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Application Information

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IPC IPC(8): C04B2/10C01F11/06
Inventor 曲玉珠
Owner 曲玉珠
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