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Method for preparing active lime

A technology of active lime and lime, which is applied in the field of active lime production, can solve the problems that the internal quality of lime cannot be fundamentally improved, the shelf life of active lime is long, and the production cost is high.

Inactive Publication Date: 2006-10-11
湖北省通山县通力镁业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The active lime produced by this method cannot fundamentally improve the intrinsic quality of the lime; or the protective film fails after processing and pulverizing smaller particles
Chinese patent 0324925 adopts the method of lime passivation box, and the active lime produced by this method has a long shelf life, but the relative production cost is high

Method used

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  • Method for preparing active lime
  • Method for preparing active lime

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The new type of lime is prepared according to the production process shown in the schematic diagram.

[0020] 1. Preparation

[0021] 1. Use a high-pressure blower to spray coal powder into the rotary kiln and ignite it to keep the temperature in the high temperature zone of the kiln at 1000°C-1250°C.

[0022] 2. Put the limestone with a diameter of 10-30mm into the kiln tail inlet.

[0023] 3. Rotary kiln speed is set at 90 rpm-130 rpm.

[0024] 4. When the temperature in the kiln is stabilized at 1000°C-1250°C, start the sodium chloride adding device and start adding sodium chloride, the amount of which is 1% to 30% of the limestone raw material. The high temperature time is 15 to 45 minutes. The optimum solution is 1100°C, and the high temperature time is 25 minutes.

[0025] 5. The capacity of this set of rotary kiln production equipment to produce new lime is 2.5-2.8 tons / hour (the production capacity of shaft kiln and muffle kiln is 0.5-3 tons / hour).

[0026]...

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Abstract

The invention discloses a process for producing active lime, which comprises adhering a passivating agent onto the lime carbonate during the common lime burning procedure, the content of passivating agent in the lime carbonate being 1-30%.

Description

technical field [0001] The invention relates to a method for producing active lime, in particular to a quality-preserving passivator for lime. Background technique [0002] At present, the traditional production of lime in my country is mainly through shaft kilns and rotary kilns. The lime produced has the highest activity of about 420mml, the highest calcium content of 92%, high carbon content and other impurities, and is easy to absorb moisture and deteriorate. In iron and steel smelting, especially in the secondary refining production, it is required that the active lime has a high calcium oxide content and less dosage, and some types of steel require the carbon content of the lime to be less than 0.2%. The traditional type of lime cannot meet this requirement in smelting, and it is used in a large amount, so it is difficult to meet the requirement in the production of certain types of steel. In order to solve the problem of moisture absorption and deterioration of activ...

Claims

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Application Information

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IPC IPC(8): C04B2/10C04B2/02
Inventor 赵凯李名顺唐铁石
Owner 湖北省通山县通力镁业有限责任公司
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