Production technology for preparing alpha-hemihydrate gypsum through microwave smouldering

A technology of hemihydrate gypsum and production process, applied in the field of building materials, can solve the problems of low efficiency and large energy consumption, and achieve the effects of uniform temperature, high thermal efficiency, high efficiency and environmental protection drying

A technology of hemihydrate gypsum and production process, applied in the field of building materials, can solve the problems of low efficiency and large energy consumption, and achieve the effects of uniform temperature, high thermal efficiency, high efficiency and environmental protection drying

CN110451830AInactive Publication Date: 2019-11-15云南凝创环保科技有限公司
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  • Production technology for preparing alpha-hemihydrate gypsum through microwave smouldering

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Embodiment Construction

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] Please refer to the attached figure 1 , what embodiment adopts is that phosphogypsum is raw material, carries out the preparation of hemihydrate gypsum, and concrete technological process comprises:

[0020] (1) Adopt the compound pretreatment method of water washing and lime neutralization, make dihydrate gypsum pH=7 and get final product without obvious floating impurities;

[0021] (2) Add 1% tartaric acid, 0.5% ethylenediaminetetraacetic acid, and ...

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Abstract

The invention discloses a production technology for preparing alpha-hemihydrate gypsum through microwave smouldering. The production technology mainly comprises the steps of pre-treatment, wherein anindustrial by-product gypsum or natural gypsum is pre-treated, and dihydrate gypsum is purified; microwave heating, wherein the pretreated material is placed into a closed container and the material is heated by using a microwave field; crystal transformation, wherein under the action of a crystal transformation agent and other additives, the crystal morphology of the material is transformed underthe combination of microwave heating; microwave drying, wherein heating is continuously conducted by using the microwave field, and excessive liquid is vaporized, discharged and collected; breaking,wherein the agglomerated material is broken by using a machine; storage, wherein the broken material is hermetically stored at a certain humidity, temperature and the like. The production technology has the advantages of being environmentally friendly, efficient and controllable in cost, and the alpha-hemihydrate gypsum capable of meeting the national standards can be prepared.

Description

technical field [0001] The invention relates to the technical field of building materials, and more specifically relates to a production process for preparing α-hemihydrate gypsum by using a microwave dry stewing method. Background technique [0002] At present, the autoclaved method or normal pressure salt solution method is mostly used to prepare α-hemihydrate gypsum, which has low efficiency and high energy consumption. Contents of the invention [0003] The purpose of the present invention is to provide a production process for preparing α-hemihydrate gypsum by microwave dry stewing method, which has the characteristics of environmental protection, high efficiency, controllable cost and the like. [0004] To achieve the above object, the present invention provides the following technical solutions: [0005] A production process for preparing α-hemihydrate gypsum by using a microwave dry stewing method, characterized in that the process is suitable for by-product gypsu...

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Application Information

Patent Timeline
15 Nov 2019
Publication
CN110451830A
IPC
C04B11/032; C04B11/02; C04B11/26
CPC
C04B11/02; C04B11/032; C04B11/26; C04B11/264
Inventors
全思臣; 赵志曼