To contribute to the valorization of local materials, the physico-chemical and mineralogical characterization of two clay materials MJ and MN collected in the Mayo Tsanaga river which crosses the Makabaye district of Maroua (Cameroon) was carried out. For this purpose, various methods of characterization have been used, namely granulometric analysis, Atterberg limits, X-ray fluorescence spectrometry and X-ray diffraction. It is apparent from the granulometry that the clay materials studied titrate 33.77% of clays for MJ against 44.13% for MN. The plasticity indices Ip with values IpMJ = 19.27% and IpMN = 23.4% place the materials in the plastic domain and offer them the possibility to being shaped into objects. The chemical composition of the MJ and MN materials reveals that the silicon oxide SiO2, the aluminumoxide Al2O3 and iron oxide Fe2O3 are their main constituents. The X-ray diffraction of the MJ and MN materials shows that they consist mainly of quartz with associated kaolinite, illite, montmorillonite, perlialite, dickite, nacrite, amesite, albite, brookite and anorthite. In addition to these, 2/1 minerals such as muscovite, nontronite, glauconite, and phlogopite are also identified in the MJ material. The peaks of sanidine, microcline and gismondine are also found in the MN material. The materials being rich in clay minerals 2/1 can be valorized in the adsorption and the absorption of the oils and greases and in the waterproofing of the grounds. The presence of quartz, kaolinite and illite is undoubtedly favorable for the manufacture of ceramic products in terracotta. These products will be obtained at a relatively lower temperature due to illite, feldspars and iron minerals that provide vitrification during firing by forming eutectics. The aluminosilicate amorphous phases contained in the studied materials can be exploited to produce geopolymer cements and concretes.
Clays are more or less hydrated, aluminosilicates; majority of which belong to the phyllitic silico-aluminates group [
Clay materials exist in almost all regions of Cameroon [
The efficient and rational use of these materials is most often limited by the low durability and mechanical resistance of their products. This is compounded by the fact that the mineral and chemical compositions of these abundant clay materials are unknown which makes it difficult to improve on the types and yields of the products manufactured from these clays. Without knowledge of chemical and mineralogical composition, it is difficult, for example, to know if a clay is fusible or refractory. The aim of this project therefore was carried out, the mineral and chemical composition of some clays of the Far North Region of Cameroon.
To do this, two representative clay materials MJ and MN, which are superimposed, were sampled in Maroua town in the Far North Region of Cameroon. The chosen zones represent areas of high concentration of activities that employ clay the confection of pottery or construction materials. Chemical and mineral composition as well as granulometric analysis and the Atterberg limits were carried out on these materials. The results of this research will go a long way to contribute to the enrichment of the limited data base on clay materials in Cameroon.
The results of the work will be used to feed a database to support the start-up of industrial projects for local clay materials. The long-term wish is that this experimental and scientific approach, applied to a current raw material, contributes to the valorization of local materials and to sustainable development.
For this work, two representative clay materials MJ and MN were sampled in the Mayo Tsanaga river in Maroua town in the Far North Region of Cameroon. The chosen zone represents area of high concentration of activities that employ clay for the confection of pottery or construction materials. The clay material was located 70 cm deep below the sand layer. Maroua is located on latitude 10˚34'83''N and on longitude 14˚17'34''E and is 414 m above sea level. The MJ sample is brownish yellow (Munshell Code 10YR 6/6) while the MN sample is black (Munshell Code N2.5/). One of the major reasons for the choice of these clays is that the reserves are so enormous that they can satisfy an industrial demand.
It reflects the determination of the weight proportions of particles contained in the clay materials according to their sizes. Wet sieving of samples and the sedimentation of the fraction less than 100 µm were carried out according to French standards NF P18-560 [
Atterberg constant was determined by passing the clay material through a 400 μm aperture using the mechanical Casagrande apparatus according to the French standard NF P94-057 [
This constant determines the water content W which characterizes the following change:
Solid → Plastic: Wp
Plastic → Liquid: Wl
The plasticity index Ip of the material was then determined from the Equation (1):
Ip = W l − W p (1)
The chemical composition of the clay materials was determined by X-ray fluorescence spectrometry using the Panalytical AXIOS PW4400 spectrometer. The molten pearl method was used. The beads were obtained from the dissolution of the materials in lithium tetraborate (Li2B4O7) and homogenized at 1150˚C.
X-ray diffraction was obtained using a diffractometer suitable for the characterization of polycrystalline plane samples, the X’PER PRO MDP diffractometer from Panalytical. The scanned angular range is between 5 and 70˚ in 2θ (angle of incidence). The copper Kα1 radiation (wavelength = 1.540598 Å) used was produced at a voltage of 40 kV and an intensity of 40 mA.
The diffractograms are plotted with the Panalytical X’PERT Highscore plus 3.0 software. Their stripping was done using the P.D.F. (Powder Diffraction File) of Materials Data Inc’s MDI JADE 6.5 software that maps inter-reticular distances d to recorded 2θ angles and mineralogical phases contained in material samples.
The MN material is therefore richer in clay minerals than the MJ material, even though they have the same amounts of silt. Generally, the more a material is rich in fine fraction, the more it requires water to pass from a solid paste to a plastic paste and from it to a liquid paste [
These results show that the MJ material is less plastic than the MN material. The MJ and MN materials can resist flow under its own proper weight up to moisture contents of 35.8% and 46.6% respectively. However, the plastic deformation, corresponding to its normal consistency (between 15% and 40%), requires less than 16.53% water for MJ and 23.2% water for MN. These results (plasticity index 19.27% and 21.5%) show that these materials are plastics [
The results of the chemical analysis expressed as mass percentages of the oxides of MJ and MN materials are presented in
From a qualitative point of view, the materials have the same kinds of oxides quantitatively, apart from silicon oxide; the difference in the percentage composition of the oxides in the two materials is relatively small or non-existent in some cases (SO3 and P2O5). SiO2, Al2O3 and Fe2O3 are the major oxides in these materials. The oxide SiO2 is of a preponderant proportion in several studied Cameroonian clay materials [
Liquid limit Wl (%) | Plastic limit of Wp (%) | Plasticity index Ip (%) | |
---|---|---|---|
MJ | 35.8 | 16.53 | 19.27 |
MN | 46.6 | 23.2 | 23.4 |
Oxides | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | SO3 | Na2O | K2O | TiO2 | P2O5 | Mn2O3 | L.O.I. | Total |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
MJ | 51.43 | 15.34 | 11.02 | 3.60 | 1.48 | 0.66 | 2.38 | 4.26 | 1.92 | 0.08 | 0.20 | 7.62 | 99.99 |
MN | 41.89 | 14.64 | 17.47 | 2.92 | 1.75 | 0.66 | 2.15 | 4.88 | 2.26 | 0.08 | 0.26 | 11.04 | 100 |
MJ Material | |||
---|---|---|---|
Mineral | Formula | Inter-reticular distance d in angström | PDF file number |
Quartz | SiO2 | 4.24 Å, 3.33 Å, 2.45 Å, 1.98 Å, 1.81 Å, 1.54 Å and 1.38 Å | PDF 46-1045 |
Muscovite | KAl2Si3AlO10(OH)2 | 10.05 Å, 4.46 Å, 3.34 Å and 2.56 Å | PDF 07-0025 |
Phlogopite | KMg3(Si3Al)O10(OH)2 | 10.05 Å, 3.35 Å and 2.61 Å | PDF 10-0493 |
Nontronite | Na0.3FeSi4O10(OH)24H2O | 15.04 Å and 4.46 Å | PDF 29-1497 |
Illite | (K,H3O)Al2Si3AlO10(OH)2 | 9.98 Å, 5.01 Å, 4.48 Å, 3.72 Å, 3.45 Å, 3.33 Å, 3.19 Å, 2.98 Å, 2.56 Å and 1.50 Å | PDF 26-0911 |
Nacrite | Al2Si2O5(OH)4 | 7.19 Å, 3.60 Å and 1.48 Å | PDF 07-0350 |
Perlialite | K2.02Al2Si4.76O13.53 | 15.75 Å, 4.57 Å, 3.47 Å, 3.17 Å and 2.90 Å | PDF 39-0294 |
Kaolinite | Al2Si2O5(OH)4 | 7.23 Å and 1.49 Å | PDF 14-0164 |
Glauconite | K(Fe, Al)2(SiAl)4O10(OH)2) | 10.13 Å, 4.54 Å and 2.58 Å | PDF 09-0439 |
Albite | Na(AlSi3O8) | 4.04 Å | PDF 99-0001 |
Montmorillonite | Ca0.2(Al, Mg)2Si4O10(OH)24H2O | 15.21 Å, 5.01 Å, 4.51 Å and 1.49 Å | PDF 13-00135 |
---|---|---|---|
Dickite | Al2Si2O5(OH)4 | 7.23 Å, 3.60 Å and 2.33 Å | PDF 10-0446 |
Amesite | (Mg, Fe, Al)3−x[SiAlO5](OH)4−2x | 7.15 Å and 3.54 Å | PDF 37-0429 |
Brookite | TiO2 | 3. 51 Å and 2.90 Å | PDF 29-1360 |
Anorthite | CaAl2Si2O8 | 3.22 Å, 3.21 Å and 3.19 Å | PDF 41-1486 |
Material MN | |||
Quartz | SiO2 | 4.25 Å, 3.34 Å, 2.45Å, 2.28 Å, 2.23 Å, 2.12 Å, 1.98 Å, 1.81 Å, 1.80 Å, 1.67 Å, 1.54 Å, 1.45 Å, 1.38 Å and 1.37 Å | PDF 46-1045 |
Sanidine | K(Si3Al)O8 | 4.27 Å, 3.81 Å, 3.47 Å, 3.34 Å, 3.29 Å, 3.27 Å, 3.24 Å, 3.01 Å, 2.92 Å, 2.77 Å, 2.61 Å, 2.59 Å, 2.39 Å, 2.18 Å, 2.02 Å, 1.93 Å and 1.79 Å | PDF 25-0618 |
Dickite | Al2Si2O5(OH)4 | 7.23 Å, 3.60 Å and 2.33 Å | PDF 10-0446 |
Nacrite | Al2Si2O5(OH)4 | 7.23 Å, 3.60 Å and 1.48 Å | PDF 07-0350 |
Amesite | (Mg, Fe, Al)3−x[SiAlO5](OH)4−2x | 7.15 Å and 3.54 Å | PDF 37-0429 |
Kaolinite | Al2Si2O5(OH)4 | 7.23 Å, 3.59 Å and 1.49 Å | PDF 14-0164 |
Illite | (K,H3O)Al2Si3AlO10(OH)2 | 10.05 Å, 5.03 Å, 4.48 Å, 3.72 Å, 3.46 Å, 3.34 Å, 3.20 Å, 2.99 Å, 2.56 Å and 1.50 Å | PDF 26-0911 |
Perlialite | K6Na3Al9Si27O7221H2O | 15.94 Å | PDF 39-0224 |
Gismondine | CaAl2(Si2O8)4(H2O) | 7.31 Å, 4.92 Å, 4.27 Å, 3.34 Å, 3.19 Å, 3.13 Å and 1.82 Å | PDF 20-0452 |
Microcline | KAlSi3O8 | 4.24 Å and 3.26 Å | PDF 99-0067 |
Albite | NaAlSi3O8 | 4.04 Å, 3.66 Å and 3.22 Å | PDF 19-1184 |
Brookite | TiO2 | 3.51 Å and 2.90 Å | PDF 29-1360 |
Anorthite | CaAl2Si2O8 | 3.22 Å, 3.21 Å and 3.19 Å | PDF 41-1486 |
Montmorillonite | Ca0,2(Al, Mg)2Si4O10(OH)24H2O) | 15.21 Å, 5.01 Å, 4.51 Å and 1.49 Å | PDF 13-00135 |
The MJ and MN materials consist mainly of quartz with associated kaolinite, illite, montmorillonite, perlialite, dickite, nacrite, amesite, albite, brookite and anorthite. In addition to these, 2/1 clay minerals such as muscovite, nontronite, glauconite, and phlogopite are identified in the MJ material. These minerals are present in the vertisols found in the North [
The kaolinite peak at 7.2 Å on the MJ diffractogram was resolved indicating the presence of a crystallined kaolinite.
A similar peak in the material MN is represented by a dome, characteristic of a mineral with a lower degree of crystallinity: such a peak denotes the presence of a poorly crystallized or amorphous kaolinite which does not have a microstructural organization [
The 2/1 clay minerals have been used in the adsorption and absorption of oils and greases and also in the waterproofing of soils [
This work characterized two samples of clay material obtained from the Tsanaga River of the Far North Region of Cameroon. Granulometric analysis showed that the clay contents of samples MJand MN were 33.77% and 44.13% respectively. The materials are essentially plastics in nature which make them amenable for the fabrication of different articles as suggested by their plasticity values, 19.27% and 23.4% for MJ and MN. Major oxides present in the two samples are SiO2, Al2O3 and Fe2O3. The presence of quartz, kaolinite and illite is undoubtedly favorable for the manufacture of ceramic and assimilated products.
From a perspective of sustainable local development, this study is part of the contribution to the promotion of local materials. It is therefore an important scientific contribution in the knowledge and characterization of industrial mineral resources of Cameroon.
The authors declare no conflicts of interest regarding the publication of this paper.
Yanné, E., Oumarou, A.A., Nde, B.D. and Danwé, R. (2018) Physico-Chemical and Mineralogical Characterization of Two Clay Materials of the Far North Region of Cameroon (Makabaye, Maroua). Advances in Materials Physics and Chemistry, 8, 378-386. https://doi.org/10.4236/ampc.2018.89025