Development of a Control System for Automating of Spiral Concentrators in Coal Preparation Plants
Spiral concentrators have been widely used in coal preparation plants in Illinois and elsewhere to clean 1 mm ×150 μm particle size coal fraction. The major factors which have made spiral concentrator so popular include its low capital and operating cost, no chemical reagent or dense medium requirement, and the ease of operation/maintenance. Spirals are capable of providing excellent clean coal recovery although at a relatively high ash content. Like any other water-only separation process, spirals are also susceptible to continuously fluctuating feed quality and solids content in the feed slurry, which are quite common in a plant. The main objective of the project is to develop an inexpensive control system for spiral to automatically adjust the splitter position with fluctuating feed characteristics to maintain the desired effective separation specific gravity (density cut-point).
KeywordsWheatstone Bridge Pulp Density Clean Coal Flotation Column Splitter Position
The authors would like to acknowledge the grant provided by ICCI (# 06-1/2.1A.6) to support this work.
- 1.Abbot J (1982) The optimization of process parameters to maximize the profitability from a three-component blend. In: Proceedings – 1st Australian coal preparation conference, April 6–10, New Castle, Australia, pp 87–105Google Scholar
- 2.Bethell PJ, Arnold BJ (2003) Comparing a two-stage spiral to two stages of spirals for fine coal preparation. In: Honaker RQ, Forrest WR (eds) Symposium on recent advances in gravity separation, SME Annual Meeting, Littleton, CO, pp 107–114Google Scholar
- 3.Luttrell GH, Kohmuench JN, Stanley FL, Trump GD (1999) An evaluation of multi-stage spiral circuits. In: Proc. 16th International Coal Preparation Conference, pp 79–88.Google Scholar
- 4.Luttrell GH, Honaker RQ, Bethell PJ, Stanley FL (2003) Proceedings – 20th international coal preparation exhibition and conference, Lexington, Kentucky, April 29–May 1, pp 69–78Google Scholar
- 5.Luttrell GH, Kohmuench JN, Stanley FL, Trump GD (1998) Improving spiral performance using circuit analysis. Minerals and Metallurgical Processing Journal 15(4):16–21Google Scholar
- 6.Prinsolo TR, Abela RL (1998) Multiple stage fine coal spiral concentrators. In: Proceedings of the international coal preparation congress, Brisbane, Australia, October 4–10, pp 245–253Google Scholar
- 7.Crowe CT, Elger DF, Roberson JA (2005) Engineering fluid mechanics, 8th edn. Wiley, New York, p 441, Appendix A14Google Scholar
- 8.Yoon RH, Phillips DI, and Luttrell, GH., (2000) “Applications of Advanced Fine Coal Cleaning and Dewatering Technologies,” Proceedings, 7th Asia-Pacific Economic Cooperation (APEC) Clean Fossil Energy Technical Seminar, APEC Experts Group on Clean Fossil Energy, Chapter VI (3), Taipei, China, March 7-8, 2000, 10 ppGoogle Scholar