A method for preparing high-strength sulphoaluminate cement for co-production of sulfuric acid
A sulfoaluminate cement, high-strength technology, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of ineffective utilization of phosphogypsum, high initial strength, increased cost and difficulty of sulfuric acid preparation from sulfur dioxide, etc. question
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[0010] a. Preparation of cement raw meal:
[0011] Dosing according to the following parts by mass: 65-80 parts of phosphogypsum, 18-28 parts of bauxite, 1-2 parts of steel slag, 1-3 parts of silica, 3-4 parts of anthracite; mix the components and grind , to obtain cement raw meal after homogenization;
[0012] b. Preparation of cement clinker:
[0013] 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;
[0014] c. Preparation of sulphoaluminate cement:
[0015] The cement clinker obtained in step b is ground again to obtain sulphoaluminate cement.
[0016] Preferred of the present invention:
[0017] The fineness of the material after grinding in step a is 120-180 mesh;
[0018] Al in the bauxite 2 o 3 The mass fraction is 60-75%, more preferably 66%;
[...
specific Embodiment approach
[0047] 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.
[0048] The phosphogypsum in each embodiment is all taken from the hemihydrate phosphogypsum by-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, Bauxite is produced in Shijiazhuang, Hebei, and its main components are shown in Table 3, and the main components of silica are shown in Table 4 below.
[0049] Table 1: Main components and contents of phosphogypsum
[0050] 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
[0051] Table 2: Main components and content of steel slag
[0052] ...
Embodiment 1
[0058] Dosing according to the following mass parts: 65 parts of phosphogypsum, 28 parts of bauxite, 1 part of steel slag, 3 parts of silica, 3 parts of anthracite; then grind and mix each component until the fineness is 120 meshes, and obtain raw cement raw material; place the prepared cement raw material in a rotary kiln and calcinate at 1250°C for 30 minutes to obtain cement clinker; 2 / Kg, the sulphoaluminate cement product can be obtained, and the mechanical properties of the obtained sulphoaluminate cement are shown in Table 5.
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