Recycling of Ornamental Stones Hazardous Wastes

Soltan, Abdel Monem; Taman, Zeinab; El-Kaliouby, Baher

doi:10.4236/nr.2011.24031

Cited by 6 publications

(2 citation statements)

References 20 publications

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“…Polyvinyl chloride (PVC) is a thermoplastic material that is widely used in different applications such as pipes, packaging materials, window frames, cables, bottles, and even in medical devices due to its advantageous physical, chemical, and anti-degradable properties such as high mechanical strength, durability, excellent resistance to acids and bases, and low production costs. − PVC is the second most-produced thermoplastic after polyethylene. , In 2015, 38 million tons of PVC were produced, and 16 million tons of PVC waste was generated …”

Section: Introductionmentioning

confidence: 99%

Upcycled Polyvinyl Chloride (PVC) Electrospun Nanofibers from Waste PVC-Based Materials for Water Treatment

Razzaq

McEachern

Rupar

et al. 2023

ACS Appl. Eng. Mater.

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In recent decades, the increased use of polyvinyl chloride (PVC) in industries and households has led to a surge in PVC waste pollution, which mandates developing solutions for the removal of waste PVC from the environment. We report upcycling, the conversion of waste material to a high-value-added product, of PVC-based products to electrospun (ES) fibers (mats). As two common PVC products, waste PVC pipe and waste PVC pool float were upcycled to ES fibers for water treatment. The fabrication process and fiber characteristics, such as morphology, surface charge, and mechanical strength of upcycled fibers, were studied and compared with the same fibers fabricated using research-grade (RG) PVC (commercial PVC powder). In addition, the effect of additives such as calcium carbonate in PVC waste products on the physicochemical properties of upcycled fibers was evaluated. The results showed that upcycling of waste PVC to ES fibers is feasible since the upcycled fibers showed similar or superior properties compared to their equivalent fibers from RG-PVC. Finally, the performance of upcycled fibers on the removal of dyes from the water was evaluated. The upcycled fibers from waste PVC pipes and pool float outperformed the RG PVC fibers in removing methylene blue from water by showing more than 97% removal efficiency. In addition, the upcycled PVC ES fibers showed more than 80% reusability after five adsorption−desorption cycles.

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Section: Introductionmentioning

confidence: 99%

Upcycled Polyvinyl Chloride (PVC) Electrospun Nanofibers from Waste PVC-Based Materials for Water Treatment

Razzaq

McEachern

Rupar

et al. 2023

ACS Appl. Eng. Mater.

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“…Вводят шлам в состав глиняной массы для производства керамических материалов [10][11][12][13]. Отходы переработки мрамора, преимущественно твердые, используются для получения извести [14]. Отходы гранита используют для стабилизации рыхлых грунтов [15], а мраморную пыль -глинистых [16].…”

Section: Introductionunclassified

Dolomite type nephrite processing wastes and their application

Kislov

Khudyakova

Nikolaev

2023

Min.Sci.Technol. (RUS)

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The demand for ornamental stone material has led to an increase in the amount of rock mass being processed. However, the production of lapidary works and jewelry result in a significant amount of waste. This study aims to investigate the material composition and physical and mechanical properties of the solid wastes generated during the processing of dolomite type nephrite in the Vitim region. The accumulation of such waste leads to increased costs of transportation, storage, security, and negative environmental impact. The majority of dolomite type nephrite deposits are located in the Northwest, Northeast, and South of China, in South Korea, Australia, Italy, and Poland, with a large deposit in the Vitim region of Russia. In this study, the waste from the Kavoktinsky deposit, the most productive in Russian, was used. A visual and petrographic examination of nephrite, skarn and amphibolite which are components of the solid waste, was conducted. The macro- and microchemical composition of nephrite of different colors was studied, and X-ray phase analysis was performed. The decorative properties of the waste were determined. A radiation and hygienic certificate was obtained. The waste has a crushability grade of 1200, abrasion grade of I1, and frost resistance of F400. The study has shown that the waste does not contain grains of incompetent rocks, clay, dust, and clay particles. The solid waste form the Vitim nephrite processing is of high quality and meets the requirements of GOST 8267-93, except for an increased content of flagstone (flattened) and large size fragments. It can be used for the production of ordinary, decorative, and mosaic concrete, decorative plates, interior decoration of premises, bathrooms, and saunas, and the manufacture of souvenir products. However, further research is needed to investigate the application of the waste as a raw material for stone casting and a slow-release fertilizer. The utilization of this waste not only solves the problem of waste disposal but also improves economic performance of mineral extraction.

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