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A method for preventing lime deliquescence pulverization by using nitrogen

A technology of lime powder and lime, applied in the field of metallurgy, can solve the problems of lime damp, consumption, large electric energy, etc.

Active Publication Date: 2022-03-04
NEW TIANJIN STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that it consumes a large amount of electric energy. To make Ca(OH) 2 Decomposes into CaO and H on heating 2 O needs to be heated to a temperature above 450°C
It is a huge waste of energy consumption
[0005] Chinese patent CN 106732386A discloses a preparation method of a composite desiccant made of polyethylene glycol and organic quicklime. This method uses the property of lime to easily absorb moisture to prepare a desiccant, but cannot solve the problem of lime being damp.
[0006] None of the above patented technologies has studied how to prevent the occurrence of lime moisture from the overall process of lime production, storage, and transshipment

Method used

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  • A method for preventing lime deliquescence pulverization by using nitrogen
  • A method for preventing lime deliquescence pulverization by using nitrogen
  • A method for preventing lime deliquescence pulverization by using nitrogen

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Nitrogen is used to isolate the lime from the air under a slight positive pressure (to form a nitrogen micro-positive pressure environment around the lime, thereby isolating the contact between the lime and the humid air) to prevent the lime from absorbing moisture and decomposing. The nitrogen in the lime block storage bin is charged The flow rate is 5m 3 / h, the nitrogen flow rate during production and unloading is 197m 3 / h, the nitrogen flow rate when loading and unloading is 172m 3 / h, the nitrogen flow rate when not loading or unloading is 30m 3 / h; Steelmaking high-level lime block storage bin is filled with nitrogen gas for 15m 3 / h, so that it can obtain a slight positive pressure of nitrogen; the lime pulverizer is filled with nitrogen for 20m 3 / h, so that it can obtain a slight positive pressure of nitrogen; the nitrogen pressure for lime powder transportation tank truck ashing is 0.8MPa, and the sintered lime powder silo is filled with nitrogen for 10m ...

Embodiment 2

[0074] Nitrogen is used to isolate the lime from the air under a slight positive pressure to prevent the lime from absorbing moisture and decomposing. The nitrogen flow rate of the lime block storage bin when loading is 10m 3 / h, the nitrogen flow rate during production and unloading is 207m 3 / h, the nitrogen flow rate when loading and unloading is 182m 3 / h, the nitrogen flow rate when not loading or unloading is 40m 3 / h; Steelmaking high-level lime block storage bin is filled with nitrogen for 13m 3 / h, so that it can obtain a slight positive pressure of nitrogen; the lime pulverizer is filled with nitrogen for 18m 3 / h, so that it can obtain a slight positive pressure of nitrogen; the nitrogen pressure used for lime powder transport tank truck ashing is 0.76MPa, and the sintered lime powder silo is filled with nitrogen 8m 3 / h, so that it can obtain a slight positive pressure of nitrogen. The calcium oxide detection of the final lime powder was 86wt%, the calcium oxid...

Embodiment 3

[0077] Nitrogen is used to isolate the lime from the air under a slight positive pressure to prevent the lime from absorbing moisture and decomposing. The nitrogen flow rate of the lime block storage bin is 15m when charging. 3 / h, the nitrogen flow rate during production and unloading is 202m 3 / h, the nitrogen flow rate when loading and unloading is 179m 3 / h, the nitrogen flow rate when not loading or unloading is 35m 3 / h; Steelmaking high-level lime block storage bin is filled with nitrogen gas for 10m 3 / h, so that it can obtain a slight positive pressure of nitrogen; the lime pulverizer is filled with nitrogen for 15m 3 / h, so that it can obtain a slight positive pressure of nitrogen; the nitrogen pressure for lime powder transportation tank truck ashing is 0.7MPa, and the sintered lime powder silo is filled with nitrogen for 5m 3 / h, so that it can obtain a slight positive pressure of nitrogen. The calcium oxide detection of the final lime powder was 87wt%, the cal...

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Abstract

The invention relates to the technical field of metallurgy, in particular to a method for preventing lime deliquescent pulverization by utilizing nitrogen. The method comprises: the limestone is calcined in a lime kiln to form lime blocks, and transported to the lime block storage bin, a certain flow rate of nitrogen is introduced into the bottom of the lime block storage bin to form a slight positive pressure; a part of the lime blocks enters the lime grinding machine, and the lime Nitrogen is fed into the pulverizer to form a slight positive pressure, and the ground lime powder is transported by the lime powder transport tanker into the sintered lime powder silo; nitrogen is fed into the top of the sintered lime powder silo to form a slight positive pressure; the other part of the lime block enters the refining The steel high-level lime block storage bin is ready for use. Nitrogen gas is injected into the bottom of the storage bin to form a slight positive pressure; the invention uses nitrogen to isolate the contact between lime and humid air, thereby preventing the occurrence of lime deliquescent pulverization, improving product quality, and saving energy. Production costs, and the reduction in lime consumption directly reduces carbon dioxide emissions from decomposing limestone.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preventing lime deliquescent pulverization by utilizing nitrogen. Background technique [0002] Lime is calcined at high temperature to decompose carbon dioxide from limestone, and its main components are calcium oxide, magnesium oxide, and silicon dioxide. It is also called quicklime. Lime plays a very important role in iron and steel production, and the sintering production process, ironmaking production process, and steelmaking production process are all inseparable from the role of lime. However, lime has the characteristic of easily absorbing the deliquescence of moisture in the air, especially in the rainy season when the air humidity is relatively high. The deliquescence of lime reduces the CaO content of lime and also reduces the activity of lime, which affects the temperature of sinter mixture. The pelletizing performance of the sintered ore affects the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65D88/74B65D88/54C04B2/10
CPCB65D88/745B65D88/54C04B2/10
Inventor 牛树林顾凤义俞飞韩萍闫文凯
Owner NEW TIANJIN STEEL GRP
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