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Device and method for producing type II anhydrous gypsum from desulfurized gypsum

Anhydrous gypsum and desulfurized gypsum technology, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium sulfate, etc., can solve problems such as increased processing costs, poor stability, and close temperature, and improve resource utilization The effect of high efficiency, stable performance and stable quality

Pending Publication Date: 2020-02-18
JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN 110066125A discloses a two-step production process of building gypsum powder based on the characteristics of desulfurized gypsum, which mainly includes mixing and ball-milling desulfurized gypsum raw materials and plasma-treated carbon fibers to obtain a mixture, performing preliminary drying and subsequent calcination on the mixture, and then Carry out aging and homogenization to obtain building gypsum powder; the use of plasma in this process increases the processing cost, and the low calcination temperature makes the dehydration of desulfurized gypsum incomplete and poor in stability
CN 204138536U discloses a device for drying and calcining desulfurized gypsum, comprising sequentially connected feed structure, breaking structure, airflow drying tower, pulse bag filter and induced draft fan, the pulse bag filter is connected with calcining fluidized furnace , the bottom of the pulse bag filter is provided with a spiral conveying structure, the spiral conveying structure is connected with the feed port of the calcined fluidized furnace through a dry gypsum conveying pipe, and the waste heat outlet of the calcined fluidized furnace is connected with the dispersing structure through an air duct; the device is closed Good performance, can produce a variety of gypsum products, but the layer distribution of drying and calcination is not clear, the temperature of the two is close, and anhydrous gypsum products cannot be obtained, and the application range is limited

Method used

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  • Device and method for producing type II anhydrous gypsum from desulfurized gypsum
  • Device and method for producing type II anhydrous gypsum from desulfurized gypsum
  • Device and method for producing type II anhydrous gypsum from desulfurized gypsum

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Embodiment 1

[0078] This embodiment provides a device for producing type II anhydrite from desulfurized gypsum, the structural connection diagram of the device is as follows figure 1 As shown, it includes a drying unit 2 , a calcining unit 3 and a product collection unit 7 connected in sequence, the drying unit 2 includes a crushing device 21 and at least one stage of drying device, and the calcining unit 3 includes a fluidized calcining device 32 .

[0079] The crushing device 21 includes a forced air dryer, and a crushing cutter head is arranged below the feed port of the crushing device 21. The structural schematic diagram of the crushing cutter head is as follows: figure 2 As shown, the crushing cutter head is connected with a motor.

[0080] Described drying device comprises cyclone type drier, is divided into 4 stages, wherein first-stage drying device 22, secondary drying device 23, third-stage drying device 24, fourth-stage drying device 25 are connected successively; Solid separ...

Embodiment 2

[0090] This embodiment provides a device for producing type II anhydrite from desulfurized gypsum. The structure of the device refers to the structure in embodiment 1, the difference is that the drying device of the drying unit 2 includes two stages, two stages of drying The solid outlet of the device 33 is connected with the calcining unit 4 .

Embodiment 3

[0094] This embodiment provides a method for producing Type II anhydrite from desulfurized gypsum, said method is carried out using the device in Example 1, comprising the following steps:

[0095] (1) Crushing and drying the desulfurized gypsum by-product of the limestone-gypsum wet desulfurization process, the free water content of the desulfurized gypsum accounts for 12wt% of the total amount of desulfurized gypsum, and the particle size of the crushed raw material is less than 75 μm. 90%, the number of drying stages is 4, the temperature of the next stage of drying is higher than the temperature of the previous stage of drying, and the temperature of the last stage of drying is 350 ° C, to obtain type III anhydrite, the crushing and drying process Into the heat source gas;

[0096] (2) The type III anhydrite obtained in step (1) is subjected to fluidized calcination treatment, the temperature of the calcination treatment is 550° C., and the time of the calcination treatmen...

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Abstract

The invention provides a device and a method for producing type II anhydrous gypsum from desulfurized gypsum. The device comprises a drying unit, a calcining unit and a product collecting unit which are sequentially connected, wherein the drying unit comprises a crushing device and at least one-stage drying device, and the calcining unit comprises a fluidized calcining device. According to the device disclosed by the invention, the desulfurized gypsum is accurately converted into the II-type anhydrous gypsum through the combination of drying and calcining processes, oxidation of calcium sulfite and decomposition of organic matters in the desulfurized gypsum can be realized, the impurity removal rate reaches more than 99%, and the influence of harmful impurities on gypsum products is greatly reduced; according to the method, when super sulfate cement is taken as a target product, the lowest limit value of chloride ions in desulfurized gypsum raw materials is increased, and the pretreated water consumption and secondary water pollution are indirectly reduced; according to the invention, the comprehensive utilization efficiency of the desulfurized gypsum is improved, the super sulfatecement is further compounded, the product has stable performance and high strength, and the application way of the desulfurized gypsum is expanded.

Description

technical field [0001] The invention belongs to the technical field of solid waste utilization, and relates to a device and method for producing Type II anhydrite from desulfurized gypsum. Background technique [0002] With the development of the national economy, fossil energy such as coal and petroleum is used in large quantities, and SO will be produced during the combustion process. 2 , NO x Among them, thermal power generation is one of the important sources of gas pollutants, while the demand for electricity continues to increase, making the amount of pollutants still increasing. Desulfurization and denitrification have become necessary environmental protection measures for every coal-fired or oil-fired device. At present, the desulfurization processes mainly include limestone-gypsum wet desulfurization, limestone-gypsum dry or semi-dry desulfurization, and ammonia desulfurization, among which limestone-gypsum wet desulfurization process accounts for about 90% and is ...

Claims

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Application Information

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IPC IPC(8): C04B11/028C04B11/26C01F11/46
CPCC04B11/028C04B11/264C01F11/466
Inventor 宋小霞万建东唐绍林陈家伟彭卓飞
Owner JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
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