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Lime kiln calcining process for active calcium oxide production

A technology of activated calcium oxide and calcination process, applied in the field of lime kiln calcination process, can solve the problem of uneven heating of limestone, achieve the effect of reducing the formation of underfired lime and overfired lime, and uniform heating

Active Publication Date: 2020-07-28
安徽东方钙业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the process of calcining limestone in the above-mentioned patent, although the limestone raw material is evenly distributed in the kiln body through the distributor, the limestone raw material is still concentrated into a relative whole inside the kiln body, resulting in that the limestone raw material cannot be mixed with high-temperature gas. Uniform contact results in uneven heating of the limestone, resulting in the formation of excess underfired and overfired lime

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  • Lime kiln calcining process for active calcium oxide production
  • Lime kiln calcining process for active calcium oxide production
  • Lime kiln calcining process for active calcium oxide production

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Embodiment 1

[0043] The invention discloses a lime kiln calcination process for the production of active calcium oxide. The calcination process is carried out in a special lime kiln; figure 1 and figure 2 As shown, the special lime kiln includes a vertical holding furnace body 11, and the holding furnace body 11 includes a preheating zone 11, a calcination zone 12 and a cooling zone 13 from top to bottom, and the preheating zone 11, the calcination zone 12 and the cooling zone 13 is provided with a temperature detector 14 at the bottom and top; the lime kiln also includes a feed inlet 2 arranged at the top of the holding furnace body 11, a distributor 15 arranged at the feed inlet 2, and a material distributor 15 arranged at the bottom of the holding furnace body 11. The discharge port 3 at the end, the gas pipe 4 arranged at the bottom of the calcination zone 12 of the holding furnace body 11, the cooling gas pipe 5 arranged at the bottom of the cooling zone 13 and the smoke exhaust pipe...

Embodiment 2

[0055] A lime kiln calcination process for active calcium oxide production, comprising the following steps:

[0056] Stone pretreatment:

[0057] Crumble the limestone raw material into 20mm limestone particles, and then use the bucket elevator to transport the limestone particles to the distributor 15 at the top of the special lime kiln, and the distributor 15 will then add the limestone particles to the preheating zone 11 at the top of the holding furnace In; Calcination process also includes the following steps:

[0058] Preheating in preheating zone 11: the limestone particles are preheated by the rising high-temperature gas in the calcining zone 12, and the preheating temperature is 960°C; The time for transporting the material (including the time for the material to move from the distributor 15 to the distribution plate 7, but excluding the time for the preheated material to fall into the calcining zone 12, the material falling time is controlled by the flow rate of the...

Embodiment 3

[0063] A lime kiln calcination process for active calcium oxide production, comprising the following steps:

[0064] Stone pretreatment:

[0065] The limestone raw material is crushed into 25mm limestone particles, and then the limestone particles are transported to the distributor 15 at the top of the special lime kiln by the bucket elevator, and the distributor 15 then adds the limestone particles to the preheating zone 11 at the top of the holding furnace body 1 In; Calcination process also includes the following steps:

[0066] Preheating in preheating zone 11: the limestone particles are preheated by the high-temperature gas rising in the calcining zone 12, and the preheating temperature is 990°C; the residence time of limestone particles on the six-layer distribution board 7 is 6.5 minutes, and the 7 distribution boards The time for transporting the material (including the time for the material to move from the distributor 15 to the distribution plate 7, but excluding the...

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Abstract

The invention discloses a lime kiln calcining process for active calcium oxide production, belonging to the field of calcium oxide production. The invention aims to solve the problems that limestone is heated unevenly and is prone to generating underfire lime and overfire lime in the calcining process of limestone with an existing lime kiln. The lime kiln calcining process comprises the followingsteps: pretreatment of limestone; preheating in a preheating zone, wherein a preheating temperature is in a range of 960 to 1000 DEG C, limestone particles are preheated in the preheating zone in a layered manner, and total preheating time is 46 + / - 5 min; calcining in a calcining zone, wherein a calcining temperature is in a range of 1150 to 1200 DEG C, and the limestone particles are calcined inthe calcining zone in a layered manner for 18 + / - 2 minutes; cooling in a cooling area, wherein a discharging temperature is in a range of 90 to 100 DEG C, and the limestone particles are cooled in the cooling area in a layered manner; and blanking. According to the invention, the step of preheating in the preheating zone, the step of calcining in the calcining zone, the step of cooling in the cooling zone and the step of blanking are carried out in a specially-made lime kiln. According to the invention, the specially-made lime kiln is utilized, so limestone is heated more uniformly, and theformation of underfire lime and overfire lime is reduced.

Description

technical field [0001] The invention relates to the field of calcium oxide production, more specifically, it relates to a lime kiln calcination process for active calcium oxide production. Background technique [0002] Calcium oxide, also known as calcium oxide, can be used as a common desiccant for removing water vapor by chemical absorption, and can also be used as a dehydrating agent in the dehydration process of steel, pesticide, medicine, desiccant, tanning and alcohol. Calcium oxide is usually prepared by high-temperature calcination of limestone, so that the limestone decomposes at a temperature of about 1000 ° C to generate calcium oxide and carbon dioxide. The calcination of limestone is realized in a lime kiln. [0003] The existing Chinese patent with application number CN201720001569.9 discloses an environmentally friendly, automatic, high-efficiency and energy-saving disc unloading lime kiln, which includes a kiln body; one side of the kiln body is provided with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/12
CPCC04B2/12
Inventor 纪慧枝胡芳
Owner 安徽东方钙业有限公司