Method for preparing sulphate aluminium cement through phosphogypsum

A sulphoaluminate cement and a technology for producing sulphoaluminate, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve problems such as ineffective utilization of phosphogypsum, high production costs, and environmental pollution. Achieve good economic and environmental benefits, low production costs, and simple process routes

Active Publication Date: 2017-02-22
KINGENTA NORSTERRA CHEM CO LTD +1
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Problems solved by technology

[0003] Chinese patent document CN1401604A discloses a manufacturing process of fast-hardening sulfoaluminate cement. The raw material ratio of this process is 17-20% of dehydrated phosphogypsum, 45-52% of limestone, and 31-35% of bauxite. The successful use of waste phosphogypsum to replace the natural gypsum in the raw meal mix can partially reduce the cost of sulphoaluminate cement, but the amount of phosphogypsum used in the process only accounts for 17-20% of the raw meal mix. 45-52% of

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  • Method for preparing sulphate aluminium cement through phosphogypsum

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preparation example Construction

[0012] a. Preparation of cement raw meal:

[0013] Dosing according to the following parts by mass: 65-80 parts of phosphogypsum, 18-28 parts of bauxite, 2-4 parts of steel slag, 3-5 parts of anthracite; mix all components, grind and homogenize to get raw cement material;

[0014] b. Preparation of cement clinker:

[0015] Calcining the cement raw meal prepared in step a at 1250-1300° C. for 30-40 minutes to obtain cement clinker;

[0016] c. Preparation of sulphoaluminate cement:

[0017] The cement clinker obtained in step b is ground again to obtain sulphoaluminate cement.

[0018] According to the present invention, preferably, the fineness of each component in step a after grinding is 120-180 mesh;

[0019] Preferably, Al in the described bauxite 2 o 3 The mass fraction is 55-68%, further preferably 62%;

[0020] Preferably, the phosphogypsum is phosphogypsum hemihydrate.

[0021] According to the present invention, preferably, batching is carried out according to...

specific Embodiment approach

[0052] The present invention will be further described in detail below in conjunction with specific embodiments, but is not limited thereto.

[0053] Phosphogypsum in each of the following examples is taken from the hemihydrate gypsum produced by the new wet-process phosphoric acid of Jinzheng Da Nuo Taier Chemical Co., Ltd., its main components are shown in Table 1, and the main components of steel slag are shown in Table 2 below, aluminum Bauxite was produced in Shijiazhuang, Hebei, and its main components are shown in Table 3.

[0054] Table 1: Main components and contents of phosphogypsum

[0055] components CaO SO 3

Fe 2 o 3

Al 2 o 3

SiO 2

content% 36.96 52.63 0.15 0.57 1.97

[0056] Table 2: Main components and content of steel slag

[0057] components CaO Fe 2 o 3

SiO 2

Al 2 o 3

SO 3

content% 47.45 18.75 16.43 5.31 /

[0058] Table 3: Main composition and content...

Embodiment 1

[0061] Dosing according to the following parts by mass: 65 parts of phosphogypsum, 28 parts of bauxite, 4 parts of steel slag, and 3 parts of anthracite; then grind and mix each component until the fineness is 120 meshes to obtain cement raw meal; The prepared cement raw meal is placed in a rotary kiln and calcined at 1250°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 method for preparing sulphate aluminium cement through phosphogypsum. The method includes the steps that limestone and natural gypsum are completely replaced with the phosphogypsum, the phosphogypsum is subjected to powder grinding and homogenized through bauxite, solid waste steel residues and anthracite and calcined at the temperature of 1,250 DEG C to 1,300 DEG C to prepare the sulphate aluminium cement. By means of the method, the using rate of the phosphogypsum can be greatly increased, and high-concentration sulfur-dioxide tail gas can be prepared into sulfuric acid through absorption. The hardening speed of sulphate aluminium cement clinker prepared with the method is high, the earlier-stage strength is high, the later strength is also enhanced to be stable, and performance testing indicates that the mechanical strength of the sulphate aluminium cement prepared with the method meets the standard of the sulphate aluminium cement.

Description

technical field [0001] The invention belongs to the technical field of cement materials, and relates to a method for preparing sulphoaluminate cement by using phosphogypsum, which is waste from phosphorus chemical industry, as a raw material. 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 continue to expand, they are limited due to the high cost of the product, making more users out of reach. On the other hand, as one of the world's three major phosphate fertilizer producers, it is difficult to realize mass utilization due to the re...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/36C01B17/50
CPCC01B17/506C04B7/323C04B7/36
Inventor 刘阳胡善明胡兆平李兴平
Owner KINGENTA NORSTERRA CHEM CO LTD
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