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Novel calcination technique for gypsum

A calcination process and gypsum technology, which is applied in the field of building materials, can solve the problems of complicated process, application restriction of industrial by-product gypsum, and low thermal efficiency, and achieve the effects of improving calcination thermal efficiency, controllable calcination temperature, and reducing production energy consumption

Inactive Publication Date: 2009-04-01
宁夏建筑材料研究院(有限公司)
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Due to the complex impurity composition of industrial by-product gypsum, small particles, and a certain amount of attached water, directly adopting the above-mentioned traditional method for producing gypsum powder has low thermal efficiency and high energy consumption, and it is difficult to produce qualified gypsum powder
Therefore, the industrial by-product gypsum is usually pre-treated to a certain extent (such as washing method, neutralization method) to remove the impact of impurities on the product, but this treatment has a complicated process and brings new pollution ( Such as washing wastewater, etc.)
The above reasons lead to great restrictions on the application of industrial by-product gypsum

Method used

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  • Novel calcination technique for gypsum

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Embodiment Construction

[0012] 1. The specific structure of the mixed rotary tube calciner:

[0013] The mixed rotary tube calcining kiln includes a kiln body 1 supported by a support member 7 and driven to rotate by a transmission mechanism 8 . A feed pipe 9 and a flue gas mixing chamber 3 are installed at the front end of the kiln body 1 , and a discharge port 10 and a flue gas circulation chamber 4 are installed at the end. The above-mentioned flue gas mixing chamber 3 and the flue gas circulation chamber 4 are connected through a flue gas circulation pipe 5 , and the flue gas circulation pipe 5 is provided with an air induction device 13 . The circulating smoke pipe 6 communicates with the kiln body 1 and its front end chamber sealing box 11, and the sealing box 11 is provided with an exhaust port 12. A high-temperature coil 2 is installed in the kiln body 1, and the two ends of the coil 2 communicate with the flue gas mixing chamber 3 and the flue gas circulation chamber 4 respectively.

[001...

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Abstract

This invention relates to a new type of calcination technology characterizing in applying a mode of inner burning and outer burning, which applies an exclusive calcination method, namely, combination of back flow and forward flow and a coil pipe penetrating thermal medium is set in a kiln to get a new technology of mixing inner and outer calcination and guarantee fully heat exchange of the substance and the hot smoke, so that the calcination temperature can be controlled to produce gesso meeting the national standard, meanwhile, circulation pipelines are increased to the device so as to increase the thermal efficiency of calcinations and multi-kind fuel can be applied in the production process to adjust technical parameters easily.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a new calcination process for gypsum. Background technique [0002] With the rapid development of my country's industry, the annual discharge of industrial solid waste (such as flue gas desulfurization gypsum, phosphogypsum, also known as industrial by-product gypsum) has increased rapidly. According to relevant statistics, more than 30 million tons of phosphogypsum are produced in my country every year. Gypsum will be more than 20 million tons, and these by-product gypsum piles up like mountains, most of which are unused, seriously polluting the environment. [0003] At present, the treatment and utilization of industrial by-product gypsum is mainly to replace natural gypsum with a certain process to make various gypsum products. There are two traditional methods for preparing gypsum: one is the external firing method, that is, the material is not in direct contact wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/02C04B11/028
Inventor 段庆奎王立明王惠琴陈兴福周学璞谢恩良
Owner 宁夏建筑材料研究院(有限公司)
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