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Energy-saving preparation method for calcium oxide

A quicklime and limestone technology, applied in the field of energy-saving preparation of quicklime, can solve the problems of slow firing speed and high energy consumption, and achieve the effects of reduced consumption, low product density and good quality

Inactive Publication Date: 2013-05-01
唐杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can effectively solve the problems of slow burning speed and high energy consumption when burning quicklime in the existing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get 100kg limestone, pulverize into powder, obtain limestone fine powder, the particle diameter of limestone fine powder is 0.01-1mm, set aside. Take 5kg of coal powder and 8kg of water respectively, and mix the coal powder and water evenly to obtain the additive.

[0027] The above-mentioned limestone fine powder and additives are mechanically or manually stirred to obtain a mixture, and then the mixture is sent to a pressing machine for pressing to obtain a limestone embryo body. The limestone embryo body is a cuboid, and a group of through holes are arranged on a group of parallel faces of the limestone embryo body.

[0028] Send the prepared limestone body into a shaft kiln for firing at a temperature of 1100°C to obtain 60kg of quicklime, of which the volume of the limestone body accounts for 80% of the kiln volume.

[0029] The whole firing process is about 2 hours, and the firing time is effectively shortened. At the same time, compared with the traditional met...

Embodiment 2

[0031] Get 100kg limestone, pulverize into powder, obtain limestone fine powder, the particle diameter of limestone fine powder is 0.01-3mm, set aside. Take 5kg of coal powder and 8kg of water respectively, and mix the coal powder and water evenly to obtain the additive.

[0032] The above-mentioned limestone fine powder and additives are mechanically or manually stirred to obtain a mixture, and then the mixture is sent to a pressing machine for pressing to obtain a limestone embryo body. The limestone embryo body is a cylinder, and a through hole is arranged in the axial direction of the cylinder.

[0033] The prepared limestone body is sent to the wheel kiln for preheating to 650°C, and then heated to 950°C for firing to obtain 65kg of quicklime, of which the volume of the limestone body accounts for 85% of the kiln volume.

[0034] The entire firing process is about 2.1 hours, and the firing time is effectively shortened. At the same time, compared with the traditional me...

Embodiment 3

[0036] Get 100kg limestone, pulverize into powder, obtain limestone fine powder, the particle diameter of limestone fine powder is 0.01-2mm, set aside. Take 5kg of coal powder, 3.5kg of clay, and 7kg of water respectively, and mix the coal powder, clay, and water evenly to obtain the additive.

[0037] Take 100kg of fine limestone powder and 10kg of additives, stir the fine powder of limestone and the additives mechanically or manually to obtain a mixture, and then send the mixture into a press for pressing to obtain a limestone embryo body. The limestone embryo body is a cylinder, and a through hole is arranged in the axial direction of the cylinder.

[0038] Firstly, the prepared limestone body is sent to the tunnel kiln for preheating to 550-600°C, and then heated to 1000-1050°C for firing to obtain 64kg of quicklime, of which the volume of the limestone body accounts for 92% of the kiln volume.

[0039]The whole firing process is about 1h45min, and the firing time is obvi...

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Abstract

The invention discloses an energy-saving preparation method for calcium oxide. The energy-saving preparation method aims at solving the problems of low firing speed, low yield, lower utilization rate of heat energy, higher energy consumption and a large amount of wasted energy sources when the calcium oxide is prepared by adopting a traditional method. The preparation method comprises four steps, namely a step of preparing calcium oxide fine powder, a step of preparing an additive, a step of preparing a calcium oxide green body and a firing step. Compared with a traditional firing method for the calcium oxide, the energy-saving preparation method disclosed by the invention has the advantages of capability of saving over 70 percent of energy, remarkable economic and social value, and remarkable functions of reducing energy source consumption and increasing enterprise benefit. Meanwhile, the activity degree of the prepared calcium oxide is higher and the quality of products is obviously improved.

Description

technical field [0001] The invention relates to the fields of chemical industry and smelting, in particular to an energy-saving preparation method of quicklime. Background technique [0002] The main component of limestone is calcium carbonate, which can be directly fired into quicklime. The main component of quicklime is calcium oxide, which has been widely used in plastics, coatings, papermaking, steelmaking and other industries. For example, in steelmaking, adding limestone can simultaneously convert silicon dioxide in ore into slag. One of the essential raw materials for steel. [0003] At present, when limestone is burned in the existing process, limestone and coal need to be loaded into an earthen kiln in the order of one layer of limestone and one layer of coal, and then calcined at high temperature to obtain quicklime after calcination. However, when the quicklime is prepared by this method, the firing speed is slow, the output is low, the utilization rate of heat ...

Claims

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Application Information

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IPC IPC(8): C04B2/10
CPCY02P40/40
Inventor 刘彬唐杰
Owner 唐杰
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