Study for Recycling of Ceria-Based Glass Polishing Powder

Kazuhiro Kato; Toshiaki Yoshioka; Akitsugu Okuwaki

doi:10.1021/ie990622x

Circular economy and durability in geopolymers ceramics pieces obtained from glass polishing waste

International Journal of Applied Ceramic Technology ◽

10.1111/ijac.13780 ◽

2021 ◽

Author(s):

Afonso R.G. de Azevedo ◽

Markssuel Teixeira Marvila ◽

Leandro Barbosa de Oliveira ◽

Weslley Macario Ferreira ◽

Henry Colorado ◽

...

Keyword(s):

Circular Economy ◽

Glass Polishing

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Velocity control algorithm in glass polishing based on the cubic NURBS curve

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406217736080 ◽

2017 ◽

Vol 232 (4) ◽

pp. 685-696 ◽

Cited By ~ 3

Author(s):

Junzhao Han ◽

Wenhua Chen

Keyword(s):

Control Algorithm ◽

Linear Acceleration ◽

Control Points ◽

Velocity Control ◽

Polishing Process ◽

Nurbs Curve ◽

Weighting Factors ◽

Final Velocity ◽

Contact Points ◽

Glass Polishing

To limit velocity fluctuations and to achieve a controllable jerk value in a glass polishing process, a new velocity control algorithm is proposed based on nonuniform rational B-splines (NURBS). The key of this algorithm is replacing the traditional linear acceleration–deceleration with flexible NURBS acceleration–deceleration. Based on the linear acceleration–deceleration algorithm, the control points of the NURBS curve are confirmed, and the final velocity of the polishing wheel center is solved using the Preston equation. With jerk continuity and limitations of the servo system, nonlinear equations are constructed, and the weighting factors corresponding to the control points are obtained. Cubic velocity control equations can be derived from the obtained feature parameters, which include the final velocity, control points, weighting factors and knot vectors. Based on the proposed NURBS acceleration–deceleration algorithm, a fourth-order Runge–Kutta formula was used to obtain the initial points, and the Milne–Hamming equation was used to predict and correct the next point. The predictor-corrector interpolation algorithm for parametric trajectory was implemented during the polishing process. The experimental results indicate that the proposed approach guarantees limited fluctuations of the relative velocity at contact points and ensure smoother velocity changes at dangerous points.

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Recycle of Ceria-Based Glass Polishing Powder Using NaOH Solution.

NIPPON KAGAKU KAISHI ◽

10.1246/nikkashi.2000.725 ◽

2000 ◽

pp. 725-731 ◽

Cited By ~ 12

Author(s):

Kazuhiro KATO ◽

Toshiaki YOSHIOKA ◽

Akitsugu OKUWAKI

Keyword(s):

Naoh Solution ◽

Glass Polishing

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Contributions of Rare Earth Materials in the Development of the Glass Industry, Crystal Technology, Glass Polishing, Electro- Optical Devices, and the Chemical Industry

Rare Earth Materials ◽

10.1201/b17045-11 ◽

2014 ◽

pp. 272-313

Keyword(s):

Rare Earth ◽

Chemical Industry ◽

Glass Industry ◽

Optical Devices ◽

Glass Polishing

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Recovery of Cerium from Glass Polishing Waste: A Critical Review

Metals ◽

10.3390/met8100801 ◽

2018 ◽

Vol 8 (10) ◽

pp. 801 ◽

Cited By ~ 14

Author(s):

Chenna Borra ◽

Thijs Vlugt ◽

Yongxiang Yang ◽

S. Offerman

Keyword(s):

Particle Size ◽

Chemical Properties ◽

Value Added ◽

Leach Solution ◽

Chemical Processes ◽

Efficient Utilization ◽

Selective Precipitation ◽

Physico Chemical ◽

Main Component ◽

Glass Polishing

Ceria is the main component in glass polishing powders due to its special physico-chemical properties. Glass polishing powder loses its polishing ability gradually during usage due to the accumulation of other compounds on the polishing powder or due to changes in the particle size distribution. The recovery of cerium from the glass polishing waste results in the efficient utilization of natural resources. This paper reviews processes for the recovery of rare earths from polishing waste. Glass polishing powder waste can be reused via physical, physico-chemical or chemical processes by removing silica and/or alumina. The removal of silica and/or alumina only improves the life span up to some extent. Therefore, removal of other elements by chemical processes is required to recover a cerium or cerium-rich product. However, cerium leaching from the polishing waste is challenging due to the difficulties associated with the dissolution of ceria. Therefore, high acid concentrations, high temperatures or costly reducing agents are required for cerium dissolution. After leaching, cerium can be extracted from the leach solution by solvent extraction or selective precipitation. The product can be used either in glass polishing again or other high value added applications.

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