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A kind of desulfurization gypsum calcination process with natural gas as heat source

A calcination process and desulfurized gypsum technology, which is applied in the field of desulfurized gypsum calcination process, can solve the problems of no research, desulfurized gypsum products affecting water consumption, and plastic cracking of buildings.

Active Publication Date: 2022-08-05
镇江吉邦材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the current research on the calcination of desulfurized gypsum using natural gas as the heat source, the focus and improvement points are how to efficiently use the combustion heat of natural gas to achieve the purpose of calcination with low energy consumption, but there is no focus on how to carry out quality control when natural gas is used as the heat source However, the performance of desulfurized gypsum products directly affects the water consumption when it is subsequently applied to buildings, and then has a serious impact on the plastic cracking of buildings, which is a problem that must be paid attention to in the desulfurized gypsum calcination process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The desulfurized gypsum calcination process using natural gas as a heat source provided in this embodiment is based on the calcination device disclosed in the patent CN211255729U. The calcination process does not specifically limit the circulation operation therein, and therefore does not involve the process control of the circulation link, only the main process path of drying-transportation-calcination is limited.

[0027] The desulfurized gypsum calcination process comprises the following steps:

[0028] S1, drying the wet gypsum material in a rotary dryer to obtain dry gypsum with a moisture content of less than 1%.

[0029] The average particle size of the wet gypsum material derived from the feeding system is 35 μm to 40 μm.

[0030] The gypsum wet material in this embodiment is controlled at a feed rate of 13 t / h, and during the drying process, the inlet temperature of the rotary dryer is controlled to be 600° C., and drying is performed for 10 minutes.

[0031]...

Embodiment 2

[0036] The desulfurized gypsum calcination process using natural gas as a heat source provided in this embodiment is based on the calcination device disclosed in the patent CN211261831U. The calcination process does not specifically limit the circulation operation therein, and therefore does not involve the process control of the circulation link, only the main process path of drying-transportation-calcination is limited.

[0037] The desulfurized gypsum calcination process comprises the following steps:

[0038] Q1. Dry the wet gypsum material in a rotary dryer to obtain dry gypsum with a moisture content of less than 1%.

[0039] The average particle size of the wet gypsum material derived from the feeding system is 35 μm to 40 μm.

[0040] The gypsum wet material in this embodiment is controlled at a feed rate of 16 t / h. During the drying process, the inlet temperature of the rotary dryer is controlled to be 750° C., and the drying is performed for 20 minutes.

[0041] Q2...

Embodiment 3

[0053] This example and Example 2 are carried out based on the same calcination device, and the same parts as in Example 2 will not be repeated, and only the parts different from those in Example 2 will be described. This embodiment differs from Embodiment 2 in that:

[0054] In step Q1, the average particle size of the wet gypsum material used in this embodiment is 30 μm˜33 μm.

[0055] In step Q3, the bucket elevator lifts the dry gypsum to a height of 15m, and then falls into the calciner after passing through the dispersing machine; and the lifting speed of the elevator is controlled to be 0.3m / s~0.5m / s.

[0056] In step Q4, the frequency conversion Roots fan is adjusted to 48Hz to ensure that the pressure in the calciner is kept at 25kPa, and the dry gypsum is calcined at 150°C for 25min in the calciner to obtain a standard consistency of 0.59 and a crystal water content of 5.7%. desulfurized gypsum powder.

[0057] The desulfurized gypsum powder obtained in this exampl...

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Abstract

The invention belongs to the technical field of calcination to prepare gypsum, and particularly discloses a desulfurized gypsum calcination process using natural gas as a heat source. The calcination process is based on a desulfurized gypsum calcining device using natural gas as a heat source. By controlling the process conditions of drying and calcining in the calcining device, the properties of raw materials and intermediate products, the quality of the final product of desulfurized gypsum is finally guaranteed. The standard viscosity is controlled to be less than 0.6 and the crystal water content is 5.5% to 5.9%. The quality of the gypsum powder affects whether the internal demand for water in the application of the finished gypsum mortar is within a reasonable range to prevent it from being caused by excessive quality control. Plastic cracking, low strength and other abnormalities, provide a full guarantee for product performance.

Description

technical field [0001] The invention belongs to the technical field of gypsum preparation technology by calcination, and in particular relates to a desulfurized gypsum calcination process using natural gas as a heat source. Background technique [0002] With the development and progress of the gypsum industry, the demand for gypsum powder is increasing. The production of gypsum gypsum generally adopts a two-step gypsum calcination process of drying and calcining. However, the choice of calcination process and calcining equipment will affect the gypsum gypsum quality. [0003] In order to solve the problems such as strict site selection conditions and limited application scope when the desulphurization gypsum calcining equipment used coal as the heat source in the earlier period, my country has developed the desulphurization gypsum calcination process and equipment with natural gas as the heat source. The continuous improvement of equipment and processes has further solved th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/036C04B11/26
CPCC04B11/036C04B11/264
Inventor 蔡欣张召舟赵焕起许欣万银萍
Owner 镇江吉邦材料科技有限公司
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