Method for preparing sulphate aluminium cement by red mud

A technology of sulphoaluminate cement and red mud, which is applied in the field of cement materials, can solve the problems of high cost and difficulty in industrialization promotion, and achieve the effects of high early strength, wide industrial application prospects, and good burnability

Inactive Publication Date: 2006-09-27
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

A method described in a patent (Chinese Patent Publication No.: 1613809) for producing cement from red mud must first be processed to reduce the alkali content in th

Method used

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  • Method for preparing sulphate aluminium cement by red mud
  • Method for preparing sulphate aluminium cement by red mud
  • Method for preparing sulphate aluminium cement by red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: Design cement clinker mineral composition C 4 A 3 S 60%, C 2 S 24%, C 4 AF 16%; specific ingredients added (percentage by weight): 40.34% red mud, 26.42% limestone, 22.98% bauxite, 10% gypsum.

Embodiment 2

[0042] Embodiment 2: Design cement clinker mineral composition C 4A 3 S 56%, C 2 S 30%, C 4 AF 14%; specific ingredients added (weight percentage): red mud 37.39%, limestone 30.49%, bauxite 22.71%, gypsum 9.41%.

Embodiment 3

[0043] Embodiment 3: design cement clinker mineral composition C 4 A 3 S 52%, C 2 S 36%, C 4 AF 12%; specific ingredients added (percentage by weight): 34.02% red mud, 34.73% limestone, 22.43% bauxite, 8.82% gypsum.

[0044] Example result:

[0045] The present invention utilizes red mud to prepare sulfoaluminate cement and the hydration characteristics of various ages, carry out XRD, SEM analysis and show that, clinker main mineral C 4 A 3 S and others are well developed, and the hydration products are mainly colloids such as petal-shaped or sheet-shaped AFm, short columnar AFt, and C-S-H, which are interspersed and filled with each other, and the slurry structure is dense, which is the main source of high strength of cement. In the embodiment of the present invention, the mechanical properties of sulphoaluminate cement prepared from red mud are shown in Table 2, and compared with the quick-hardening sulphoaluminate cement produced by Beijing Saiyang Special Cement Fac...

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Abstract

The invention discloses a red mud preparing sulpho-aluminate cement, which is characterized by the following: using 26%-41% red mud to take place of part of aluminium and calcium raw material and whole silica and irony raw material of regular sulpho-aluminate cement production; grinding for certain fineness; desining the C4A3S,C2S,C4AF and main mineral of cement clinker; Preparing sulpho-aluminate cement by alumina, lime carbonate, calcium sulfate and other burdens. The sulpho-aluminate cement has quick induration speed and high early strength.

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 alumina industrial waste residue red mud as a main raw material. Background technique [0002] Red mud is highly alkaline mud (pH 10-12.5) discharged from industrial alumina production, the main chemical components are: CaO, SiO 2 , Fe 2 o 3 、Al 2 o 3 etc., are industrial hazardous waste residues, if not properly utilized, it will damage water quality, occupy cultivated land, endanger plant growth, and cause serious environmental pollution. The annual discharge of red mud in my country is as high as 3 million tons, while the utilization rate is only about 15%. At present, the use of red mud is mainly concentrated in plastic fillers, paving materials, cement, and concrete additives, and most of them are still stacked in the open air without utilization. The treatment and comprehensive utilization of red mud has at...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/36
CPCY02P40/148Y02P40/10
Inventor 赵宏伟李金洪
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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