Method for producing sulphate aluminum cement

A technology of sulphoaluminate cement and calcium sulfate, which is applied in the field of cement to achieve the effects of improving utilization rate, good mineralization, and realizing resource utilization

Active Publication Date: 2014-08-20
CHONGQING UNIV
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  • Description
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Problems solved by technology

[0005] Aiming at the production problems of the existing sulphoaluminate cement, the present invention provides a preparation method for producing sulphoaluminate cement by partial decomposition of phosphogypsum, so as to increase the phosphorus The utilization rate of gypsum realizes resource utilization of phosphogypsum, reduces production cost and meets market demand

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  • Method for producing sulphate aluminum cement

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Embodiment 1

[0032] A preparation method for producing sulphoaluminate cement by partial decomposition of phosphogypsum, the specific implementation steps are as follows:

[0033] a. Preparation of cement raw meal:

[0034] Dosing according to the following parts by mass: 55 parts of limestone, 25 parts of phosphogypsum, 20 parts of low-grade bauxite; then add coke, the consumption of coke is according to the amount of CaSO contained in phosphogypsum in the batching 4 The amount is calculated, namely C: CaSO 4 The molar ratio of the mixture is 0.5; each component is pulverized and mixed until the fineness is 100-200 mesh to obtain cement raw meal;

[0035] b. Preparation of cement clinker:

[0036] Put the raw meal prepared in step a into a rotary kiln for calcining, control the calcining temperature to 1300°C, and calcining time to 30 minutes to obtain cement clinker;

[0037] c. Preparation of cement:

[0038] Add natural dihydrate gypsum with a mass fraction of 5% to the cement c...

Embodiment 2

[0042] A preparation method for producing sulphoaluminate cement by partial decomposition of phosphogypsum, the specific implementation steps are as follows:

[0043] a. Preparation of cement raw meal:

[0044] Dosing according to the following mass parts: 33 parts of limestone, 37 parts of phosphogypsum, 30 parts of low-grade bauxite; then add coke, the consumption of coke is according to the CaSO content of phosphogypsum in the batching 4 The amount is calculated, namely C: CaSO 4The molar ratio of the mixture is 0.5; each component is pulverized and mixed until the fineness is 100-200 mesh to obtain cement raw meal;

[0045] b. Preparation of cement clinker:

[0046] Put the raw meal prepared in step a into a rotary kiln for calcining, control the calcining temperature to 1250° C., and calcining time to 30 minutes to obtain cement clinker;

[0047] c. Preparation of cement:

[0048] Add natural dihydrate gypsum with a mass fraction of 5% to the cement clinker burned ...

Embodiment 3

[0052] A preparation method for producing sulphoaluminate cement by partial decomposition of phosphogypsum, the specific implementation steps are as follows:

[0053] a. Preparation of cement raw meal:

[0054] Dosing according to the following parts by mass: 32 parts of limestone, 50 parts of phosphogypsum, 18 parts of low-grade alumina; 4 The amount is calculated, namely C: CaSO 4 The molar ratio of the mixture is 1.0; each component is pulverized and mixed until the fineness is 100-200 mesh to obtain cement raw meal;

[0055] b. Preparation of cement clinker:

[0056] Put the raw meal prepared in step a into a rotary kiln for calcining, control the calcining temperature to 1300°C, and calcining time to 30 minutes to obtain cement clinker;

[0057] c. Preparation of cement:

[0058] Add natural dihydrate gypsum with a mass fraction of 5% to the cement clinker burned in step b, mix evenly, and grind to a specific surface area of ​​360m through a ball mill 2 / Kg, made ...

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Abstract

The invention relates to a method for producing sulphoaluminate cement. Limestone, phosphogypsum, low-grade bauxite and coke are formulated into cement raw meal in a certain proportion, and calcined at high temperature after grinding and mixing. Promote the decomposition of phosphogypsum as much as possible, and the calcium oxide generated by the decomposition can replace part of the limestone. The sulfur dioxide gas can be collected to prepare sulfuric acid. The obtained cement clinker is mixed with natural dihydrate gypsum and ground to make cement products. Compared with the existing traditional production method, the method of the present invention can greatly improve the utilization rate of phosphogypsum, avoid the concentration of sulfur dioxide emitted by a small amount of decomposition of gypsum in the production process, which cannot reach the concentration used, and can also reduce the amount of limestone and carbon dioxide emissions. Burnt cement has wide adaptability and can be widely used in the production of sulphoaluminate cement using phosphogypsum, and is also suitable for the production of rapid hardening cement and expansive cement.

Description

technical field [0001] The invention belongs to the technical field of cement, in particular to a method for producing sulphoaluminate cement by using industrial waste phosphogypsum. Background technique [0002] Phosphogypsum is the industrial waste slag discharged during the wet process of phosphoric acid production. At present, the stockpile of phosphogypsum in the world has reached 1 billion tons, and my country has exceeded 300 million tons. The resource utilization of phosphogypsum was initially limited to the application field of natural gypsum, mainly used in the production of gypsum cementitious materials, cement retarders and sulfuric acid co-production of cement. However, impurities in phosphogypsum have adverse effects on material properties, and even after pretreatment, they cannot be completely eliminated; it is difficult to completely decompose phosphogypsum in the process of using phosphogypsum to produce sulfuric acid co-production of cement. These problems ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/32
Inventor 钱觉时沈燕范云燕范英儒
Owner CHONGQING UNIV
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