Process method for preparing active calcium oxide through oxygen-enriched calcination

A technology of activated calcium oxide and process method, which is applied in the field of oxygen-enriched calcination to prepare activated calcium oxide, which can solve the problems of not reaching high-end products, low calcium oxide activity, and poor quality, and achieve reduced heat loss, uniform combustion temperature, and lower The effect of loss

Inactive Publication Date: 2019-12-31
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the calcining of calcium carbonate to prepare calcium oxide mainly uses air as the combustion medium to burn high-quality fuel. There are technical problems such as high energy consumption, high pollution, low output, under-burning, and over-burning, resulting in low activity and high quality of calcium oxide products. Poor, not up to the requirements for high-end products

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  • Process method for preparing active calcium oxide through oxygen-enriched calcination

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Embodiment 1

[0030] This embodiment provides a process for preparing activated calcium oxide by oxygen-enriched calcination, specifically, including the following steps:

[0031] (1) Crush the raw limestone, screen out three particle sizes of 10-25mm, 25-40mm, and 40-55mm, and transport them to the silo 1 with a circular cross section. The silo 1 is set in a vertical pre- The upper part of the heater is composed of 3 hopper chambers whose sections are all 120° fan-shaped.

[0032] (2) The raw materials in the above-mentioned silo 1 are evenly transported to the upper preheater 3 of the vertical preheater through six feeding pipes 2, and the raw materials pass through the upper preheater 3 and the lower preheater from top to bottom 4 Conduct relative motion heat exchange with hot gas to raise temperature, where hot gas is a mixed gas from kiln tail kiln gas and kiln head cooling air.

[0033] (3) Transport the heated raw material into the rotary kiln 5 for oxygen-enriched calcination and d...

Embodiment 2

[0036] This embodiment provides a process for preparing activated calcium oxide by oxygen-enriched calcination, specifically, including the following steps:

[0037] (1) Crush the raw limestone, screen out three particle sizes of 10-25mm, 25-40mm, and 40-55mm, and transport them to the silo 1 with a circular cross section. The silo 1 is set in a vertical pre- The upper part of the heater is composed of 3 hopper chambers whose sections are all 120° fan-shaped.

[0038] (2) The raw materials in the above-mentioned silo 1 are evenly transported to the upper preheater 3 of the vertical preheater through three feeding pipes 2, and the raw materials pass through the upper preheater 3 and the lower preheater from top to bottom 4 Conduct relative motion heat exchange with hot gas to raise temperature, where hot gas is a mixed gas from kiln tail kiln gas and kiln head cooling air.

[0039](3) Transport the heated raw material into the rotary kiln 5 for oxygen-enriched calcination and ...

Embodiment 3

[0042] This embodiment provides a process for preparing activated calcium oxide by oxygen-enriched calcination, specifically, including the following steps:

[0043] (1) Crush the raw limestone, screen out three particle sizes of 10-25mm, 25-40mm, and 40-55mm, and transport them to the silo 1 with a circular cross section. The silo 1 is set in a vertical pre- The upper part of the heater is composed of 3 hopper chambers whose sections are all 120° fan-shaped.

[0044] (2) The raw materials in the above-mentioned silo 1 are evenly transported to the upper preheater 3 of the vertical preheater through nine feeding pipes 2, and the raw materials pass through the upper preheater 3 and the lower preheater from top to bottom 4 Conduct relative motion heat exchange with hot gas to raise temperature, where hot gas is a mixed gas from kiln tail kiln gas and kiln head cooling air.

[0045] (3) Transport the heated raw material into the rotary kiln 5 for oxygen-enriched calcination and ...

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Abstract

The invention discloses a process method for preparing active calcium oxide by oxygen-enriched calcination. The process method the following steps of firstly crushing and sieving raw limestone to enable the particle size of the raw limestone to be 10-55 mm, conveying the raw limestone into a stock bin with a circular cross section, wherein the stock bin is arranged at an upper part of a vertical preheater; then, uniformly conveying the raw materials in the stock bin into the vertical preheater through a blanking pipe, and preheating the raw materials by using high-temperature kiln gas and cooling gas of a vertical cooler; then, feeding the materials into a rotary kiln, and importing oxygen-enriched air from a kiln head to perform oxygen-enriched calcination; and then, feeding the calcium oxide obtained after calcination and decomposition into the vertical cooler to be cooled by air, namely, obtaining the active calcium oxide. According to the process method disclosed by the invention,through the integration of the processes of graded preheating, oxygen-enriched calcination, graded cooling, dynamic temperature monitoring and the like, and the raw materials are preheated by combining the high-temperature kiln gas and the high-temperature gas discharged from the cooler, the heat transfer efficiency of the system is greatly improved, the activity of calcium oxide is obviously improved, the energy consumption is reduced, and the energy conservation and emission reduction are realized.

Description

technical field [0001] The invention belongs to the technical field of preparing active lime by calcining limestone, and in particular relates to a process for preparing active calcium oxide by oxygen-enriched calcining. Background technique [0002] Activated calcium oxide is obtained by decomposing calcium carbonate, which has hydration activity and can react with acidic oxides. It has the advantages of small crystal grains, high porosity, small bulk density, large specific surface area, and uniform particle size. It is an ideal High-quality functional filling materials are widely used in high-end products in industries such as plastics, ink, paper, coatings, rubber, food, medicine and cosmetics. The key indicator of activated calcium oxide is activity, which is not only related to the physical and chemical properties of combustion, but also mainly determined by the control of the calcination process and system during the preparation of activated calcium oxide. At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C01F11/06
CPCC04B2/108C04B2/10C01F11/06
Inventor 朱艳超李恩田键胡唐辉刘显龙
Owner HUBEI UNIV
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