Method and device of obtaining active lime by vacuum calcining limestone

A calcined limestone, high activity technology, applied in the field of lime production, can solve the problems of loss of activity, green burning, low calcination temperature, etc., achieve high decomposition speed, solve pollution, high activity effect

Inactive Publication Date: 2006-09-13
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] To sum up, the prior art has not solved the contradiction between lime activity and limestone decomposition rate—high calcining temperature, limestone decomposition rate is fast, but lime activity is low, even over-burning and losing activity; and...

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  • Method and device of obtaining active lime by vacuum calcining limestone
  • Method and device of obtaining active lime by vacuum calcining limestone
  • Method and device of obtaining active lime by vacuum calcining limestone

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Embodiment Construction

[0057] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0058] The device for obtaining highly active lime by vacuum calcining limestone given in this example consists of an electric furnace temperature measurement and control cabinet 1, a material tank 2, a vacuum electric furnace 3, a vacuum gauge 4, an oil diffusion pump 5, a vacuum valve 6, a bypass 7, and a Roots pump. 8. Mechanical pump 9 components. The vacuum electric furnace 3 is a tankless vacuum resistance furnace with a heating power of 120kW, an effective vacuum chamber volume of φ20mm×400mm, and an operating temperature of 700-1400°C; the electric furnace temperature measurement and control cabinet 1 is electrically connected to the vacuum electric furnace 3 for monitoring and control The operating temperature of the vacuum electric furnace 3; the vacuum system for monitoring and controlling the vacuum chamber pressure of the vacuum electric ...

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Abstract

A process for preparing high-activity lime by vacuum calcining of lime stone includes such steps as crushing lime stone, loading in tank, heating in electric vacuum furnace at 750-900 deg.C under 100-1000 Pa, and quick cooling. Its activity is 380-450 ml.

Description

Technical field: [0001] The invention relates to the field of lime production, in particular to a method and a device for obtaining highly active lime by vacuum calcining limestone. Background technique: [0002] At present, there are two main methods of producing active lime - shaft kiln method and rotary kiln method. The pressure P in the calcination zone of the shaft kiln and the rotary kiln is 110-130kPa, and the temperature in the calcination zone is t 煅 The temperature is 1000-1200°C. The activity of the lime obtained by calcining limestone at such a high pressure and temperature is generally less than 360ml, and once it stays in the high temperature zone for a long time, the lime will sinter and become burnt lime, losing active. In recent years, there has also been a method of adding salt to calcined limestone to obtain active lime, but the activity of the lime produced by this method is generally still less than 360ml, which is generally lower than that of the shaf...

Claims

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Application Information

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IPC IPC(8): C04B2/10
Inventor 张羡夫
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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