Combined production method for preparing sulphoaluminate cement and sulfuric acid from flue gas desulfurization gypsum

A technology of sulfoaluminate cement and desulfurization gypsum, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve problems such as environmental pollution, fast hardening speed of desulfurization gypsum, and a large amount of limestone.

Active Publication Date: 2017-02-01
KINGENTA NORSTERRA CHEM CO LTD +1
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Problems solved by technology

[0003] Chinese patent document CN103979810A discloses a method for comprehensively utilizing papermaking lime mud, bauxite and desulfurized gypsum to prepare sulphoaluminate cement clinker. This process uses papermaking lime mud, bauxite and desulfurized gypsum as raw materials. It is obtained by raising the temperature at 20-30°C/min to 1200-1300°C and keeping it warm for 1.5-2.5h; it is taken out and cooled to room temperature, and the clinker is ground to 400m2/kg to obtain the desired product; The formula of acid salt raw meal is: papermaking lime mud 40wt%-50wt%, bauxite 35wt%-45wt%, and the rest is desulfurized gypsum. This method cleverly uses papermaking lime mud and desulfurized gypsum as the main raw materials. Sulphoaluminate cement can not only effectively utilize solid wa...

Method used

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  • Combined production method for preparing sulphoaluminate cement and sulfuric acid from flue gas desulfurization gypsum
  • Combined production method for preparing sulphoaluminate cement and sulfuric acid from flue gas desulfurization gypsum
  • Combined production method for preparing sulphoaluminate cement and sulfuric acid from flue gas desulfurization gypsum

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preparation example Construction

[0011] a. Preparation of cement raw meal:

[0012] Dosing according to the following mass parts: 63-78 parts of desulfurization gypsum, 20-32 parts of bauxite, 1-3 parts of silica, 3-4 parts of anthracite; mix all components, grind and homogenize to get cement Raw material;

[0013] b. Preparation of cement clinker:

[0014] Calcining the cement raw meal prepared in step a at 1250-1300° C. for 30-40 minutes to obtain cement clinker, collecting the sulfur dioxide tail gas generated during the calcination process and sending it to a sulfuric acid production system to prepare sulfuric acid;

[0015] c. Preparation of sulphoaluminate cement:

[0016] The cement clinker obtained in step b is ground again to obtain sulphoaluminate cement.

[0017] Preferred of the present invention:

[0018] The fineness of the material after grinding in step a is 120-180 mesh;

[0019] Al in the bauxite 2 o 3 The mass fraction is 50-60%, further preferably 55%;

[0020] The desulfurized gyp...

specific Embodiment approach

[0048] In order to better understand the essence of the present invention, the content of the present invention will be further described below in conjunction with the examples, but it cannot be regarded as a limitation of the present invention.

[0049] The desulfurized gypsum in each example is hemihydrate desulfurized gypsum after airflow drying, and its main components are shown in Table 1. Bauxite is obtained from Guizhou, and its main components are shown in Table 2. The main components of silica are shown in Table 3.

[0050] Table 1: Main components and content of desulfurization gypsum

[0051] components CaO SO 3

Fe 2 o 3

Al 2 o 3

SiO 2

content% 37.86 52.63 0.45 1.06 0.93

[0052]Table 2: Main composition and content of bauxite

[0053] components CaO Fe 2 o 3

SiO 2

Al 2 o 3

SO 3

content% 3.84 9.86 21.28 55.45 /

[0054] Table 3: Main components and content of ...

Embodiment 1

[0057] Dosing according to the following mass parts: 63 parts of desulfurized gypsum, 32 parts of bauxite, 2 parts of silica, 3 parts of anthracite; then grind and mix each component until the fineness is 120 mesh, and obtain cement raw meal; prepare The good cement raw material is placed in a rotary kiln and calcined at 1300°C for 30 minutes to obtain cement clinker. After calcining, the tail gas containing sulfur dioxide is sent to the sulfuric acid preparation system to prepare sulfuric acid; the fired cement clinker is ground again to 350m 2 / Kg, the sulphoaluminate cement product can be obtained, and the mechanical properties of the obtained sulphoaluminate cement are shown in Table 4.

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Abstract

The invention relates to a combined production method for preparing sulphoaluminate cement and sulfuric acid from flue gas desulfurization gypsum. According to the method, flue gas desulfurization gypsum which replaces limestone and natural gypsum completely is mixed with bauxite, silica and anthracite, and the sulphoaluminate cement is obtained after calcinations. The method can improve the utilization rate of flue gas desulfurization gypsum by a large margin, and the tail gas containing sulfur dioxide with a higher concentration can be absorbed to prepare sulfuric acid; the prepared sulphoaluminate cement clinker is fast in rate of hardening, high in early strength and further promotes the stability of later strength; through the performance tests, it is indicated that the mechanical strength of the sulphoaluminate cement prepared by the method meets the standard of rapid hardening sulphoaluminate cement.

Description

technical field [0001] The invention relates to a method for preparing sulphoaluminate cement to co-produce sulfuric acid from desulfurized gypsum, and belongs to the technical field of cement preparation. Background technique [0002] With the modernization of engineering technology, the technical requirements for special cement are getting higher and higher. These include the special requirements for the speed of rapid setting and hardening and the hardness of each stage during the construction of special projects, such as the connection construction of cement pipelines, and the construction of foundation sites for large-scale equipment. However, although the application and the sales market are constantly expanding, they are limited due to the high cost of the product, making more users out of reach. On the other hand, my country's flue gas desulfurization technology is mainly wet desulfurization process. The consequence of this limestone-gypsum wet desulfurization proce...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/36C04B7/43C04B7/44C01B17/74
CPCC01B17/74C04B7/32C04B7/36C04B7/43C04B7/44
Inventor 万连步姚华龙胡善明刘阳李兴平
Owner KINGENTA NORSTERRA CHEM CO LTD
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