Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
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Therefore, in the present work aluminium sulphate was prepared from kaolin and its performance for combination tanning was studied. Difraction and vibrational spec-troscopic studies were carried out to confirm the prepared aluminium sulphate. Combination tanning was carried out with mimosa vegetable tannins. Leathers tanned with the combination ...
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The poly-aluminum-ferric-sulfate (PAFS) coagulant was further obtained from the leachate, and its coagulation performance was evaluated by jar tests. It was found that the PAFS is highly effective under acid conditions, and shows the highest removal efficiency of 93.7% for Direct Blue 2B with a dosage of 140 mg/L.
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Among the different natural aluminum sources, kaolin clay seems to be an alternative candidate as raw material for alumina production, because of its high aluminum content in the form of kaolinite. The well-known Bayer process for alumina production cannot be used for alumina production from kaolin due to the dissolution of …
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On the basis of adjusting the silica-to-alumina ratio, kaolin and ammonium sulfate [ (NH4)2SO4] are mixed and heated in a furnace at temperatures between 200 and 1000 °C. The parameters studied ...
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The produced −25 μm kaolin was transformed to active meta-kaolin via calcination at 750 °C for 5 h. Through metakaolin- H 2 SO 4 interactions, and consequently precipitation in ethanol solution, aluminum sulfate was formed.
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Aluminum sulfate accounts for about half of the chemical production using kaolin. Another rather significant volume and high value end-use of kaolin is in making synthetic zeolites, or "sieve minerals".
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Kaolin was transformed to meta-kaolin by calcination at 800oC for 2h. γ-alumina powder was synthesized through extracting alumina from meta- kaolin via H2SO4 and meta-kaolin reactions and consequently precipitation in ethanol, which led to form the aluminum sulfate. The precipitated aluminum sulfate was dried and calcined at 900 …
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@article{Zhao2013InfluenceOA, title={Influence of a new coagulant aid-Enteromorpha extract on coagulation performance and floc characteristics of aluminum sulfate coagulant in kaolin–humic acid solution treatment}, author={Shuang Zhao and Baoyu Gao and Yan Wang and Zhonglian Yang}, journal={Colloids and Surfaces A: …
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The flocculation behavior of a compound bioflocculant (CBF)-aluminum sulfate (AS) dual flocculant was studied in kaolin-humic acid synthetic water treatment (Bo et al., 2011). Other studies have ...
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Reactions between kaolin and inorganic salts, such as sodium hydrogen sulfate and ammonium sulfate, or inorganic acids, such as hydrochloric acid and sulfuric acid, can be focused either on the production of Al or on the adjustment of the silica-to-alumina ratio of the kaolin. On the basis of adjusting the silica-to-alumina ratio, kaolin and ammonium …
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In this paper, magnesium sulfate was used as a lixiviant to recover rare earth from kaolin. The effects of column leaching conditions, such as the concentration of magnesium sulfate, liquid/solid ratio, flow rate, and pH of the magnesium sulfate solution on the leaching efficiency of rare earth and aluminum, were investigated. In addition, …
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Leathers tanned with the combination of aluminium sulphate from kaolin and mimosa vegetable tannin exhibited hydrothermal stability of up to 118 °C as compared to mimosa alone that showed the average of 80 °C. ... In this study we present an industrial-scaled tanning process intended to replace chrome tanning in the production of high …
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Produc- tion of aluminum compounds such as aluminum sulfate, phosphate and trich- loride account for major applications for kaolin. Aluminum sulfate accounts …
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The compound bioflocculant (CBF)-aluminum sulfate (AS) dual-coagulant and AS were comparatively studied for the coagulation of kaolin-humic acid solution. Floc properties including floc growth rate, size, strength, recoverability and fractal dimension under different pH conditions were investigated by Mastersizer 2000.
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In this research, the process of mixing the sulfuric acid and kaolin, aluminum sulfate paste subsequently extracted with distilled water that has been heated to obtain aluminum …
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The concentrated Ep was precipitated, freeze-dried and used as the CA. The purified Ep polysaccharide was studied as the CA and Aluminum sulphate (AS) was chosen as the primary coagulant (Zhao et al., 2013a). The performance efficiencies of both AS and AS–Ep extract combination were appraised in synthetic kaolin–humic acid (HA) …
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A homogeneous mixture of Al2(SO4)3·18H2O and Na2SO4·10H2O was precipitated by dropping the mixed solution of kaolin-derived aluminum sulfate and sodium hydroxide into ethanol with …
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kaolin via H2SO4 and meta-kaolin reactions and consequently precipitation in ethanol, which led to form the aluminum sulfate. The precipitated aluminum sulfate was dried and calcined at 900˚C for ...
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This paper describes the production of alumina from Nawan kaolin by acid leaching with. sulfuric and hydrochloric acids. Kaolin was calcined at 850 C and was leached with 6 M acid at. 90 C, 5M ...
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The main contaminants of kaolin are quartz and mica (10-45%), as well as iron oxide (1-10%) [4]. The extraction of alumina from kaolin has been widely investigated with a range of acid and alkali hydrometallurgical processes. Leaching of aluminium from calcined kaolinitic clays with HCl or H2SO4 solutions is proposed with the sequent ...
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This work extensively tackled the extraction, production, characterization, and application of leached poly aluminum chloride (PAC) from kaolin as a natural material to inhibit the pollution of ...
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That alumina may be easily produced from clays like kaolin which will reduce the load on bauxite resources and in addition, it will support growth of alumina industries. Value-added products of non-metallurgical applications like aluminium sulphate salt, nano alumina, and activated alumina [14, 17] are produced from kaolin acid leachate.
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A facile hydrometallurgical method was proposed for high-efficiency extraction of aluminum at low activation temperature from low-grade kaolin involving sulfuric acid assisted activation followed by water leaching. After the slurry mixture of low-grade kaolin and sulfuric acid solution was stirred at 25 °C for 3 h and further heated at 150 °C for 2 h, …
DetailsOkefomo Agbarigidoma kaolin sourced from Kwara state was used to efficiently produce alum (aluminium sulphate) as a low-cost coagulant for domestic and industrial water treatment [128]. The clay ...
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The precipitated aluminum sulfate was dried and calcined at 900 oC for 2h, which resulted the formation of γ-alumina. The structure of γ-alumina was confirmed by XRD and FTIR and the mean particles size of γ-alumina was determined by SEM to be 0.5 - 0.9 µm. The study revealed the kaolin could be promising material for preparation of γ-alumina.
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Aluminum sulfate [Al 2 (SO 4) 3] or alum is one of the chemicals that are required both in industry and water treatment companies. This research objective was to study the …
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Development of chro-mium-free tanning agent is highly needed for sustainable leather production. Use of aluminium sulphate (Al2(SO4)3) as tanning agent has a long history …
DetailsResults from XRF analysis of kaolin in Table 1 shows that the major content of kaolin are the oxides of aluminium (25.8%) and silicate (63.4%), which is the characteristic feature of kaolin clays, and are in agreement with the previous findings that reported 31.43% Al2O3 and 63.64% SiO2 for same source of kaolin clay [30].
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Aluminum foil can be utilized as a raw material for the production of potassium aluminum sulfate due to its high aluminum content. The objective of this study is to utilize aluminum waste into potassium aluminum sulfate. ... Converted aluminum can reach 82%. Keywords: Aluminum sulphate, Dry process, Kaolin, Sulphuric acid, Stirred reactor, 1 ...
DetailsDuring extraction process, Al2O3 present in kaolin was leached and reacted with sulphuric acid used for dissolution to form Al2(SO4)3 and water (Eq. 1). XRD spectrum of the prepared Al2(SO4)3 is shown in Fig. 5. Most characteristic peaks for Al2(SO4)3 are reflected in the synthesized product … See more
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The extensive consumption of aluminum, combined with the shortage of the existing raw materials, and particularly bauxite, necessitates the exploitation of alternative raw materials for the production of alumina. The present paper focuses on the possible use of kaolin, as an abundant, cheap and high-aluminum content raw material, in alumina production, …
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Anhydrous aluminum sulfate is a white crystalline solid. Aluminum sulfate is also obtained as an 18- hydrate Al2 (SO4)3.18H2O. Both forms are soluble in water, noncombustible, and nontoxic. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment.
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Coagulation performance and floc properties of compound bioflocculant-aluminum sulfate dual-coagulant in treating kaolin-humic acid solution. Author links open overlay panel Xiaowen Bo, Baoyu Gao, Nana Peng, ... low yields and high production cost [2], [10]. To overcome these limitations, researchers have done much work on screening …
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Kaolin, an aluminosilicate clay with the molecular formula of Al2Si2O5(OH)4 containing 10–40% aluminium [21, 22], is regarded as a potential substitute of bauxite in the production of Al2(SO4)3 [18].
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Kaolin by lime sintering followed by sodium carbonate treatment [7, 12]. Nano-sized α-alumina is also reported from kaolin via the hydrochloric acid leaching route [10]. Aluminium may be extracted from kaolin as aluminium chloride by the salting out process [13]. Sometimes, combined processes are also adopted to extract alumina
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Both AS and aluminum sulfate–Enteromorpha extract (AS–Ee) were used to treat synthetic kaolin–humic acid (HA) water, then the flocculation performance of two coagulants was comparatively investigated in terms of residual turbidity, UV 254 absorbance, dissolved organic carbon (DOC) removal efficiency and zeta potential. …
DetailsIn this study, aluminum sulfate (AS) was selected to combine with compound bioflocculant (CBF) for the treatment of synthetic kaolin-humic acid (HA) water. Two dual-coagulants, AS-CBF (AS dosed firstly) and CBF-AS (CBF dosed firstly), were prepared by dosing AS and CBF in reverse order.
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A statistical model based on an orthogonal factorial design was established to. optimize the preparation of alum "alu minum sulfate " by leaching a local kaolin clay. with sulfuric acid. XRF ...
DetailsThis study was carried out to investigate the use of local clays extremely abundant in the Kingdom for production of liquid alum. Local kaolinitic clay containing …
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Under optimized condition 68.75% (w/w) aluminum sulphate (alum) was extracted. The result showed that sulphuric acid could be used on a large scale to extract alum from Kaolin clay.
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