Low-temperature preparation method of sulfur silicate-belite-sulphoaluminate cement

A technology of sulphoaluminate cement and sulphosilicate, which is applied in the field of materials, can solve problems such as complex procedures and high calcination temperature, achieve low energy consumption, low calcination temperature, and solve environmental problems

Active Publication Date: 2018-11-13
YANCHENG INST OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a low-temperature preparation method of sulfosilicate-belite-sulfoaluminate cement to solve the problems of high calcination temperature and complicated procedures in the prior art

Method used

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  • Low-temperature preparation method of sulfur silicate-belite-sulphoaluminate cement

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preparation example Construction

[0026] A low-temperature preparation method of sulfosilicate-belite-sulfoaluminate cement of the present invention comprises the following steps:

[0027] (1) Put the raw materials into a planetary ball mill to mix and finely grind them; wherein, the raw materials include aluminum-silicon raw materials, aluminum raw materials, calcium raw materials, silicon raw materials, and industrial gypsum; the mass ratio of raw materials is: aluminum-silicon Raw materials: Aluminum raw materials: Calcium raw materials: Silicon raw materials: Industrial gypsum = 18.23~24.56: 6.09~23.76: 35.86~51.56: 11.23~12.47: 6.72~12.91; Among them, aluminum silicon raw materials waste aluminum silicate refractories , aluminum raw materials are bauxite, high alumina cement, CaO-Al 2 o 3 One of the base refining slags, the calcareous raw material is limestone, the silicon raw material is coal gangue, and the industrial gypsum is desulfurized gypsum and other industrial waste gypsum.

[0028] (2) Press ...

Embodiment 1

[0036] The ratio of raw materials is as shown in Table 2:

[0037] Table 2 Embodiment 1 raw material proportioning

[0038]

[0039] Specific steps are as follows:

[0040] 1) Mixing: Weigh the raw materials according to the mass ratio in Table 2, place them in a planetary ball mill, grind for 120min, and press them into cakes under a pressure of 6MPa;

[0041] 2) Calcination: place the product of step 1) in a high-temperature electric furnace, heat up to 700°C, keep it warm for 3 hours, and then cool it rapidly;

[0042] 3) Sieve: Grind until the particles can all pass through a square hole sieve with a pore size of 80 μm, and perform an XRD test, such as figure 1 .

Embodiment 2

[0044] The ratio of raw materials is as shown in Table 3:

[0045] Table 3 Embodiment 2 raw material proportioning

[0046]

[0047] Specific steps are as follows:

[0048] 1) Mixing: Weigh the raw materials according to the mass ratio in Table 3, place them in a planetary ball mill, grind for 60 minutes, and press them into cakes under a pressure of 6 MPa;

[0049] 2) Calcination: after crushing the cooled block sample, place it in a high-temperature furnace, calcine and keep it warm at 950°C for 2 hours, take it out for rapid cooling, and grind it in a ball mill to obtain sulphoaluminate cement clinker;

[0050] 3) Strength test: Mix and grind clinker and dihydrate gypsum to make cement, and perform 3d, 28d flexural, compressive, and flexural strength performance tests, as shown in Table 4.

[0051] Table 4 Example 2 Strength Performance Test

[0052]

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Abstract

The invention discloses a low-temperature preparation method of sulfur silicate-belite-sulphoaluminate cement. The low-temperature preparation method comprises the following steps: (1) putting raw materials into a planetary ball mill and uniformly mixing and finely grinding, wherein the raw materials comprise an aluminum-silicon raw material, an aluminum raw material, a calcium raw material, a silica raw material and industrial gypsum; (2) pressing the raw materials mixed in step (1) into a cake and placing the cake into a high-temperature electric furnace; calcining at the temperature of 700to 1200 DEG C; then taking out and quenching; (3) grinding a product obtained by step (2) into powder; (4) uniformly mixing the product obtained by step (3) with dihydrate gypsum and finely grinding to prepare the cement. According to the low-temperature preparation method disclosed by the invention, common wastes including gehlenite containing an intermediate product phase and other aluminate aredirectly used as the raw materials and the raw materials do not need to be subjected to modification or other treatment; the treatment cost is reduced and the utilization rate of the raw materials isimproved. The early-stage cost is greatly reduced; meanwhile, the environment problem cased by industrial wastes is solved.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a method for preparing sulfosilicate-belite-sulfoaluminate cement clinker by using an intermediate product at low temperature and a product thereof. Background technique [0002] As the most widely used building material, cement plays an important role in the progress of human society and social and economic development, but it also produces high energy and resource consumption and greenhouse gas emissions. Calcium sulfoaluminate makes sulfoaluminate cement have high early strength and high late strength, and has the advantages of impermeability, frost resistance, and corrosion resistance; at the same time, calcium sulfoaluminate has a high hydration activity and can form a large amount of calcium in the early stage. Alumite (AFt), C-S-H and aluminum hydroxide (AH 3 ) gel, so that the early strength of cement is greatly improved. [0003] Calcium sulfosilicate min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32
CPCC04B7/32Y02P40/10
Inventor 郭伟王枭陈佳彬何梓清
Owner YANCHENG INST OF TECH
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