Preparation of a Novel Cement from Red Mud and Limestone

2022 ◽  
Vol 58 ◽  
pp. 171-182
Author(s):  
Hoc Thang Nguyen ◽  
Quang Minh Do
Keyword(s):  
Red Mud ◽  
Environmental Concern ◽  
Cementitious Material ◽  
Cement Clinker ◽  
The Novel ◽  
Surrounding Water ◽  
Hydraulic Cement ◽  
Portland Cement Clinker ◽  
Calcium Aluminoferrite ◽  
Mineralogical Compositions

Red mud (RM) is an industrial waste obtained from the Bayer process which is usually discharged into marine or disposed into a landfill causing pollution for the surrounding water, air, and soils. Thus, disposal of RM is an environmental concern, and it should be recycled effectively. Because RM consists of iron- and aluminum-rich phases, it is possible to be processed into cementitious material and utilized for construction purposes. This research fabricated a type of cement from the mixture of RM and limestone. The mixture was sintered at temperature of 1180 °C to obtain the clinker of the novel hydraulic cement with C2S, C3A, and C4AF minerals. In which, C2S, C3A, and C4AF are respectively belite, alite, and tetra-calcium aluminoferrite compounds that are characteristic hydraulic minerals of Portland cement clinker. The specifications of this cement were tested and evaluated in this study such as chemical and mineralogical compositions, fineness, specific surface area, mechanical strength after 3, 7, and 28 days.

Influences of Microelement on Microstructure and Mechanical Performance of Alite-Strontium Calcium Sulphoaluminate Cement

2010 ◽  
Vol 168-170 ◽  
pp. 466-471 ◽  
Author(s):  
Qiu Ying Li ◽  
Ling Chao Lu ◽  
Shou De Wang
Keyword(s):  
Mechanical Performance ◽  
Sintering Temperature ◽  
Cementitious Material ◽  
Cement Clinker ◽  
Testing Conditions ◽  
Sulphoaluminate Cement ◽  
Portland Cement Clinker ◽  
New Type ◽  
Calcium Sulphoaluminate ◽  
Calcium Sulphoaluminate Cement

Alite-strontium calcium sulphoaluminate cement, a new type of cementitious material, is synthesized by combining strontium calcium sulphoaluminate with minerals of Portland cement clinker. The influences of excessive SO3 and SrO on the microstructure and performances of this cement are studied by XRD, SEM-EDS and lithofacies. The results show that the optimal excessive mass fraction of SO3 and SrO are 50% and 80%. The compressive strength of the cement prepared under the testing conditions reaches to 32.8MPa, 66.8MPa and 126.4MPa at 1d, 3d and 28d curing ages, respectively. The additions of SO3 and SrO are benefit to improve the content of strontium calcium sulphoaluminate, and promote the formation of alite at low sintering temperature.

Red mud addition in the raw meal for the production of Portland cement clinker

2004 ◽  
Vol 116 (1-2) ◽  
pp. 103-110 ◽  
Author(s):  
P.E. Tsakiridis ◽  
S. Agatzini-Leonardou ◽  
P. Oustadakis
Keyword(s):  
Portland Cement ◽  
Red Mud ◽  
Cement Clinker ◽  
Portland Cement Clinker

scholarly journals Synthesis and Properties of Red Mud-Based Nanoferrite Clinker

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Hongfang Sun ◽  
Chuyu Chen ◽  
Li Ling ◽  
Shazim Ali Memon ◽  
Zhu Ding ◽  
...  
Keyword(s):  
Red Mud ◽  
Environmental Concern ◽  
Raw Materials ◽  
Average Diameter ◽  
Synthesis Temperature ◽  
Raw Material ◽  
Stoichiometric Ratio ◽  
Surrounding Water ◽  
Optimum Synthesis ◽  
Combustion Technology

Red mud, an industrial waste obtained from alumina plants, is usually discharged into marine or disposed into a landfill polluting the surrounding water, atmosphere, and soil. Thus, disposal of red mud is an environmental concern and it should be recycled in an effective way. Since red mud consists of iron- and aluminum-rich phases, it can potentially be processed into cementitious material and can be used for a construction purpose. This research investigated the synthesis of nanoferrite (NF) clinker by using red mud as a raw material through chemical combustion technology for potential use in cement-based composite. Before the synthesis of NF, red mud was characterized by using XRF, XRD, and SEM techniques. From characterization results, the stoichiometric ratio of raw materials was calculated and experimentally optimized. The sample was then tested at various temperatures (815, 900, 1000, and 1100°C) to find the optimum synthesis temperature. Finally, the hydraulic activity of NF was verified and the contribution to mechanical properties was determined by replacing cement with NF at various substitution levels (0, 5, 10, and 20 wt%). Test results showed that the optimum condition for the synthesis of NF was found when the ratio of CaCO3/red mud was 1.5 and the sintering temperature was 815°C. The synthesized NF had an average diameter of 300 nm, and the main composition was brownmillerite (C4AF) with distinct hydraulic reaction. When NF was used as a substitute of Portland cement in mortar, the flexural strength with a 5% replacement level improved by 15%. Therefore, it can be concluded that the synthesis of NF provides an alternative approach to recycle red mud and could significantly help in reducing environmental pollution.

Effect of Phosphogypsum on the Clinkerization Temperature of Portland Cement Clincker

2012 ◽  
Vol 730-732 ◽  
pp. 94-99 ◽  
Author(s):  
Maria Margarida Rolim Augusto Lima ◽  
L.F.C. Braz ◽  
Regina da Conceição Corredeira Monteiro ◽  
J.P. Veiga
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Raw Materials ◽  
Cement Clinker ◽  
X Ray Diffraction ◽  
X Ray ◽  
Portland Cement Clinker ◽  
Alternative Material ◽  
Heating Up ◽  
Mineralogical Compositions

Phosphogypsum (PG) is a pollutant residue resulting from the production of phosphoric acid in the phosphated fertilizers industry. About 180 millions of tons of PG are generated worldwide per year, which originates storage problems because of the environmental restrictions and the high costs of storage spaces. Taking into account the mineralizer properties of PG it has been studied a way to valorize this residue as an alternative material in the production of Portland cement clinker. The PG and the raw-materials (limestone, marl, sand and iron oxide) were chemical, mineralogical and thermally characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD) and differential thermal analysis and termogravimetric analysis (DTA/TGA). After milling, the phosphogypsum was mixed with the raw-materials in different amounts up to 10% weight. The raw mixtures were submitted to two types of firing schedules, heating up to 1500°C without any holding time or heating up to 1350°C and holding for 20 minutes. After firing, the clinkers were analyzed by optical microscopy, milled and characterized in terms of chemical and mineralogical compositions. The clinkers were used to produce cement mortar according to NP EN 196-1 standard. The resultant test specimens were mechanically tested at 2 and 28 days according to the same standard. The obtained results show a reduction of about 140°C in the clinkerization temperature, when a raw mixture with 5% phosphogypsum was used. Standard clinkers, without phosphogypsum addition, which were fired at 1500°C, originated test specimens with a compressive strength of 48.1MPa at 28 days. Test specimens produced with clinker containing 5% phosphogypsum present higher compressive strength values at 28 days, being 55.1MPa for clinkers produced at 1500°C, and 49.4 MPa for clinkers produced at 1350°C.

Anisotropic light absorption of the calcium aluminoferrite phase in portland cement clinker

1995 ◽  
Vol 25 (4) ◽  
pp. 863-869 ◽  
Author(s):  
I. Maki ◽  
K. Fukuda ◽  
E. Oba ◽  
H. Yoshida ◽  
M. Mitsumatsu ◽  
...  
Keyword(s):  
Portland Cement ◽  
Light Absorption ◽  
Cement Clinker ◽  
Portland Cement Clinker ◽  
Calcium Aluminoferrite

scholarly journals Effect of Fineness on Mechanical Properties of Cementitious Material Made from Magnesia Slag

2021 ◽  
Vol 290 ◽  
pp. 01011
Author(s):  
Dan Cheng ◽  
Jianxun Ma ◽  
Yilei Zhang ◽  
Xuhui Chen ◽  
Wenxiao Li
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Cement Clinker ◽  
Production Environment ◽  
Portland Cement Clinker ◽  
Cementing Material ◽  
Magnesia Slag

Magnesium slag is a kind of solid waste discharged by magnesium alloy related industries in the process of producing magnesium products or their alloys. Its composition is similar to Portland cement clinker, so it has great potential to be used as a new cementing material. In this paper, magnesium slag cementitious material specimens with different fineness were made by imitating the actual production environment. The flexural strength and compressive strength of specimens with different curing ages were tested, and the influence of fineness on them was analyzed. The results show that the fineness has a significant effect on the mechanical properties of pure magnesium slag cementitious materials. Its effect on the early strength is greater than that on the later strength. But the flexural strength and compressive strength will not always increase with the increase of fineness. There is a reasonable range of fineness.

Reaction Between Portland Cement Clinker and Water

Nature ◽  
1964 ◽  
Vol 203 (4941) ◽  
pp. 138-139 ◽  
Author(s):  
A. K. CHATTERJI ◽  
T. C. PHATAK
Keyword(s):  
Portland Cement ◽  
Cement Clinker ◽  
Portland Cement Clinker
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