Method for preventing deliquescence and pulverization of lime by using nitrogen

A technology of lime powder and lime, which is applied in the field of metallurgy and can solve the problems of lime being affected by moisture, consumption, and large electric energy.

Active Publication Date: 2022-01-28
天津市新天钢钢铁集团有限公司
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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 polyet

Method used

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  • Method for preventing deliquescence and pulverization of lime by using nitrogen
  • Method for preventing deliquescence and pulverization of lime by using nitrogen
  • Method for preventing deliquescence and pulverization of lime by using nitrogen

Examples

Experimental program
Comparison scheme
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 deliquescence and pulverization of lime through nitrogen. The method comprises the following steps: calcining limestone in a lime kiln to form lime blocks, conveying the lime blocks to a lime block storage bin, and introducing a certain flow of nitrogen into the bottom of the lime block storage bin to form micro-positive pressure; sending one part of lime blocks to a lime pulverizer, introducing nitrogen into the lime pulverizer to form micro-positive pressure, and conveying pulverized lime powder to a sintered lime powder bin through a lime powder conveying tank truck; introducing nitrogen into the top of the sintered lime powder bin to form micro-positive pressure; sending the other part of lime blocks to a steelmaking high-position lime block storage bin for standby application, and introducing nitrogen into the bottom of the storage bin to form micro-positive pressure. According to the invention, contact between lime and humid air is isolated through nitrogen, so that deliquescence and pulverization of lime are prevented, the product quality is improved, the production cost is saved, and the emission of carbon dioxide generated by limestone decomposition is directly reduced due to reduction of the use amount of lime.

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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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 天津市新天钢钢铁集团有限公司
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