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Method for using calcium sulfite type desulfurization gypsum to produce high-strength environmental-friendly type plastering gypsum

A technology of calcium sulfite and desulfurized gypsum, which is applied in the production field of plaster plaster, can solve problems such as environmental pollution and waste of useful resources, and achieve the effects of protecting the ecological environment, high flexural strength, and good economic benefits

Active Publication Date: 2012-10-03
GANSU BUILDING MATERIALS DESIGN & RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since calcium sulfite cannot be directly hydrated to produce strength, the usual treatment methods in power plants are direct stacking and landfill, which not only causes environmental pollution, but also wastes useful resources. Therefore, the development and application of calcium sulfite type desulfurization gypsum produced by semi-dry process is an urgent task

Method used

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  • Method for using calcium sulfite type desulfurization gypsum to produce high-strength environmental-friendly type plastering gypsum
  • Method for using calcium sulfite type desulfurization gypsum to produce high-strength environmental-friendly type plastering gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 The method for producing high-strength environment-friendly plaster plaster by utilizing calcium sulfite type desulfurized gypsum comprises the following steps:

[0021] (1) Put the calcium sulfite type desulfurization gypsum into the fluidized fluidized furnace (T300-2000×2500 type of Jingtai County Jinlong Building Materials Company), and continuously blow air into the tuyere of the fluidized fluidized furnace to make the inside of the fluidized fluidized furnace an oxidizing atmosphere and desulfurize the calcium sulfite type The gypsum is in a boiling state, and it is fried at a temperature of 480-490°C. After 20-30 minutes, its main component, calcium sulfite, is oxidized to produce type II anhydrous gypsum.

[0022] ⑵ Add 25kg of type II anhydrite activator and 0.2kg of water retaining agent in sequence to 100kg of type II anhydrite, and put it into a mixer (DSH type spiral mixer from Wuxi Hengguang Powder Equipment Co., Ltd. ) for 10 minutes, and pa...

Embodiment 2

[0025] Example 2 The method for producing high-strength environment-friendly plaster plaster by utilizing calcium sulfite type desulfurized gypsum comprises the following steps:

[0026] (1) Put the calcium sulfite type desulfurization gypsum into the fluidized fluidized furnace (T300-2000×2500 type of Jingtai County Jinlong Building Materials Company), and continuously blow air into the tuyere of the fluidized fluidized furnace to make the inside of the fluidized fluidized furnace an oxidizing atmosphere and desulfurize the calcium sulfite type The gypsum is in a boiling state, and it is fried at a temperature of 480-490°C. After 30-40 minutes, its main component, calcium sulfite, is oxidized to produce Type II anhydrous gypsum.

[0027] ⑵Add 30kg of Type II anhydrite activator and 0.4kg of water retaining agent to 100kg of Type II anhydrite in turn, and put them into a mixer (DSH type spiral mixer from Wuxi Hengguang Powder Equipment Co., Ltd. ) for 10 minutes, and pack...

Embodiment 3

[0030] Example 3 The method for producing high-strength environment-friendly plaster plaster by utilizing calcium sulfite type desulfurized gypsum comprises the following steps:

[0031] (1) Put the calcium sulfite type desulfurization gypsum into the fluidized fluidized furnace (T300-2000×2500 type of Jingtai County Jinlong Building Materials Company), and continuously blow air into the tuyere of the fluidized fluidized furnace to make the inside of the fluidized fluidized furnace an oxidizing atmosphere and desulfurize the calcium sulfite type The gypsum is in a boiling state, and it is fried at a temperature of 490-500°C. After 20-30 minutes, its main component, calcium sulfite, is oxidized to produce type II anhydrous gypsum.

[0032] ⑵Add 35kg of type II anhydrite activator and 0.3kg of water retaining agent in sequence to 100kg of type II anhydrite, and put it into a mixer (DSH type screw mixer from Wuxi Hengguang Powder Equipment Co., Ltd. ) for 10 minutes, and pac...

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Abstract

The invention relates to a method for using calcium sulfite type desulfurization gypsum to produce high-strength environmental-friendly type plastering gypsum. The method comprises the following steps: (1) placing calcium sulfite type desulfurization gypsum into a fluidized bed roaster, continuously blowing air through an air blasting port of the fluidized bed roaster to enable the interior of the fluidized bed roaster to be in the oxidizing atmosphere, and to enable the calcium sulfite type desulfurization gypsum to be boiled, frying at the temperature of 480 to 500 DEG C, and oxidizing the main component, that is, calcium sulfite, of the calcium sulfite type desulfurization gypsum to be made into II-type anhydrous gypsum after frying for 20 to 40 minus; and (2) sequentially mixing 25 to 35 percent of II-type anhydrous gypsum exciting agent and 0.2 to 0.4 percent of water-retaining agent in the II-type anhydrous gypsum according to mass ratio, and packing according to 40 kg per bag after uniformly mixing. The method has a simple process, and the produced high-strength environmental-friendly type plastering gypsum is nontoxic, tasteless, harmless to the human body, free from environmental pollution, and suitable for indoor plastering.

Description

technical field [0001] The invention relates to a production method of plastering gypsum, in particular to a method for producing high-strength and environment-friendly plastering plaster by using calcium sulfite type desulfurized gypsum. Background technique [0002] In recent years, with the strengthening of national environmental protection, thermal power plants have adopted desulfurization treatment for the exhausted flue gas. There are many types of desulfurization processes at present. From the perspective of desulfurization process, they can be divided into three types: dry method, semi-dry method and wet method. Among them, the wet process is to use limestone slurry to spray the flue gas that has been dedusted, and fully mix and contact the limestone slurry with the flue gas to make the SO in the flue gas 2 with CaCO in slurry 3 carry out a chemical reaction. The reaction formula of the desulfurization process is as follows: SO 2 +H 2 O→H 2 SO 3 (absorption); ...

Claims

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Application Information

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IPC IPC(8): C04B11/036
Inventor 冯启彪任增茂邵继新田斌守宋旭辉王亮亮杨树新李文斌孟渊章忻李玉玺
Owner GANSU BUILDING MATERIALS DESIGN & RES INST CO LTD
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