Carbide sludge management in acetylene producing plants by using vacuum filtration

Palanisamy, R.; Periathamby, Agamuthu; Ibrahim, Shaliza

doi:10.1177/0734242x0202000607

Cited by 33 publications

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“…The remaining fraction of the calcium carbide is made up of 1-10% of calcium carbonate, 1-3% of carbon and silicates. Calcium carbide dissolves in water to produce calcium hydroxide and acetylene gas (C 2 H 2 ) [28][29][30] according to Eq. (2).…”

Section: Limingmentioning

confidence: 99%

An insight into artisanal leather making in Ghana

et al. 2020

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The production of leather from animal skins and hides through tanning processes began in the pre-historic ages. Despite the origination of new leather making techniques such as chrome tanning which is being employed extensively today, the traditional method of leather production primarily through vegetable tanning is still being practised mostly in artisanal tanneries in developing nations including Ghana. Artisanal leather making, thus, contributes beneficially to rural livelihood. Nevertheless, the growth of this sector has been stifled by the lack of innovative technologies to enhance productivity. This challenge could be partly linked to the knowledge gap on the scientific principles governing artisanal leather production processes. This study, therefore, elaborates on various process steps and materials employed in traditional leather making in Ghana and the scientific principles underlying each of the processes. It also makes a comparison between traditional and modern leather manufacturing processes and identifies knowledge and technological gaps which would inspire in-depth scientific research into artisanal leather making. Graphical abstract

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Section: Limingmentioning

confidence: 99%

An insight into artisanal leather making in Ghana

et al. 2020

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“…Calcium carbide (or calcium acetylide) and water are then reacted to produce acetylene and lime slurry (Reaction (2)) [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…CLW, referred to as carbide lime sludge, hydrated lime waste, calcium hydroxide waste and other such designations, is generated as an aqueous slurry and is composed essentially by calcium hydroxide (Ca (OH) 2 % 85-95%) with minor parts of calcium carbonate (CaCO 3 % 1-10%), unreacted carbon and silicates (1-3%) [1,2,[4][5][6]. The characteristics of the sludge are influenced by processing parameters during acetylene fabrication [1]. Although not being classified as dangerous/hazardous, its managing and disposal require special caution.…”

Section: Introductionmentioning

confidence: 99%

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Valorization of carbide lime waste, a by-product of acetylene manufacture, in wastewater treatment

Ayeche

Hamdaoui

2012

Desalination and Water Treatment

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A B S T R A C TEvery year increasing amounts of industrial waste are generated worldwide. Depending on their characteristics, wastes can represent an important source of secondary raw materials in order to replace natural resources. The growing amount of carbide lime waste (CLW), a byproduct of acetylene production, has resulted in environmental problems. In the present study, the potential use of CLW for wastewater treatment was investigated. The main characteristics of the CLW were determined. Chemical and X-ray diffraction analyses indicated that CLW was similar in chemical and mineralogical compositions to industrial lime, except for the presence of carbon in the waste. Morphological and elemental chemical analyses by scanning electron microscopy and energy dispersive X-ray spectrometry revealed that CLW particles differ from industrial lime by the presence of carbon formations. The use of CLW was evaluated in the treatment of Annaba city wastewater effluent. CLW was found to be the suitable for the treatment of Annaba city wastewater for an optimal dose of 850 mg L À1 . Percentage removal efficiency for turbidity, total suspended solids (TSS), chemical oxygen demand (COD) and 5-day biochemical oxygen demand (BOD 5 ) was found to be 96, 98.2, 90 and 84.5%, respectively. Residual turbidity in supernatant was 4.5 NTU and total residual bacteria was 68 CFU mL À1 . Algerian effluent quality standards for TSS and COD were met after treatment. However, BOD 5 , bacterial level and pH were high, emphasizing the need of pH adjustment and secondary treatment for the Annaba city effluent. The precipitation of heavy metals with CLW has been shown to be successful in reducing the level of soluble heavy metals in aqueous solution. The removal of heavy metals was enhanced at pH ranges 10À11 for zinc, 9.2À11.6 for lead, 4À11.8 for iron and 7À11.8 for copper. The results revealed that CLW can be effectively used in wastewater treatment.

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“…Lime and carbide lime (or lime sludge) can also provide the necessary alkali for activation. Carbide lime (CL) is a by-product of acetylene production through the hydrolysis of calcium carbide and composed essentially by calcium hydroxide with minor parts of calcium carbonate, unreacted carbon and silicates [7,8]. Accordingly, partially substituting for cement or lime, GGBS powder and carbide lime were used to modify the problematic silt in this study.…”

Section: Introductionmentioning

confidence: 99%

Silt subgrade modification and stabilization with ground granulated blast furnace slag and carbide lime in areas with a recurring high groundwater

Yuan

Cui

2010

2010 International Conference on Mechanic Automation and Control Engineering

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Deformation of wet silt subgrade is often problematic during pavements construction as well as under regular vehicular traffic loads. In order to create a sturdy and stable platform for pavement, soil modification and stabilization with combined ground granulated blast furnace slag (GGBS), carbide lime (CL) and ordinary Portland cement (OPC) was employed in this study. Mix proportion parameters of stabilized soils are analyzed by using the Taguchi's experiment design methodology for optimal design. Results show that OPC and GGBFS content play significant roles for the early strength and long-term strength of stabilized soil, respectively; whereas CL has an optimum content of 9% at the initial stages. Maximum unconfined compressive strength (UCS) of 1.61 and 2.32 MPa were achieved, respectively, at the optimum conditions of 4%GGBFS/6%CL//3.2%OPC at the curing age of 7 and 28 days. Splitting tensile strength (STS) increases rapidly with curing ages and reaches 0.45-0.48 MPa at the age of 56d. More dosage of carbide lime can help to the longterm strength.The GGBFS/CL/OPC-stabilized soil has a high durability. After 10 wet-dry cycles the strength loss ratio remains within 10%; after 10 freeze-thaw cycles the weight loss is below 8%.California bearing ratio (CBR) was conducted on the soil alone and the soil-stabilizer mixture. CBR ranging between 158 and 224 were obtained for the 7 days curing, whereas the silt typically has CBR less than 3.1 in its wet state.Field test was also conducted during construction using Dynamic Cone Penetrometer (DCP) to assess the strength of stabilized soil in situ. DCP test indicated that the strength development of GGBFS/CL/OPC stabilized subgrade is more rapid and the improvement of subgrade bearing capacity can facilitate an increase in compaction degree of subbase..

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Carbide sludge management in acetylene producing plants by using vacuum filtration

Cited by 33 publications

References 0 publications

An insight into artisanal leather making in Ghana

An insight into artisanal leather making in Ghana

Valorization of carbide lime waste, a by-product of acetylene manufacture, in wastewater treatment

Silt subgrade modification and stabilization with ground granulated blast furnace slag and carbide lime in areas with a recurring high groundwater

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