Method for producing sulphate aluminum cement

A technology of sulfoaluminate cement and calcium sulfate, which is applied in the field of cement to achieve the effects of good grindability, improved utilization rate and reduced production cost

Active Publication Date: 2013-09-18
CHONGQING UNIV
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  • Abstract
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  • Claims
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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 sulphate aluminum cement. The method comprises the following steps: preparing cement raw meal by proportioning limestone, phosphogypsum, low grade alumina and coke; uniformly grinding and calcining at high temperature; in the calcining process, promoting phosphogypsum to be decomposed as much as possible; replacing partial limestone by calcium oxide generated by decomposition; collecting sulfur dioxide to prepare sulfuric acid; and adding natural dihydrate gypsum in the cement clinker and grinding to prepare a cement product. Compared with the existing conventional production methods, according to the method, the utilization of phosphogypsum can be greatly improved, the utilization concentration of sulfur dioxide discharged by decomposition of little gypsum in the production process can be guaranteed to be reached, the use level of limestone is further reduced and emission of carbon dioxide is reduced. Cement calcined is wide in adaptability, can be widely applied to production of sulphate aluminum cement by phosphogypsum, and further can be suitable for producing high early strength cement, expansive cement and the like.

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 Applications(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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