NDLI: Capability Evaluation and Statistical Control of Electrostatic Separation Processes

Content Provider	IEEE Xplore Digital Library
Author	Medles, K. Senouci, K. Tilmatine, A. Bendaoud, A. Mihalcioiu, A. Dascalescu, L.
Copyright Year	1972
Abstract	The variability of the outcome is often deplored by the users of electrostatic separation equipment. A slight modification of the composition of the processed material, a change in the environmental conditions, or an alteration of the electrode configuration may cause objectionable fluctuation of product quality. Thus, the purity of the copper product recovered from electric cable wastes can easily diminish from 98%, which is fully acceptable for recycling purposes, to a value below the standard level of 97%. This paper is written with the aim of showing how statistical process control methods could contribute to the improvement of users' overall satisfaction. In order to validate a procedure for evaluating the short- and long-term capabilities of the electrostatic separation process, the authors carried out a series of experiments on subgroups of chopped electric cable wastes, which are similar to those currently processed in the recycling industry (95% polyvinyl chloride; 5% copper). The first set of experimental data showed that an ldquoin-controlrdquo electrostatic separation process can easily satisfy the level of performance required by the customers (i.e., a capability index of > 1.33). The same set of data enabled the computation of the upper and lower limits of the R- and X -bar control charts. The second set of experiments was designed to evaluate the ability of these charts to detect the following typical situations of abnormal operation of the electrostatic separation equipment: 1) a change in the composition of the processed material; 2) a failed connection of the static electrode to the high-voltage supply; and 3) the accumulation of dust on the surface of the corona electrode. Based on the authors' experience as consultants for the recycling industry, the following several recommendations have been formulated: 1) Evaluate the capability of the electrostatic separation process by performing no more than ten observations and making use of the confidence indexes; 2) use moving R- and X-bar control charts to obviate the difficulty of sampling; and 3) prepare a ldquoCorrective Actions Guiderdquo for the operators using control charts for monitoring.
Sponsorship	IEEE Industry Applications Society
Starting Page	1086
Ending Page	1094
Page Count	9
File Size	845849
File Format	PDF
ISSN	00939994
Volume Number	45
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrostatics Separation processes Electrodes Recycling Control charts Composite materials Copper Fluctuations Process control Metals industry statistical process control (SPC) Control chart electrostatic separation process capability
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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