Pilot-scale testing of microbubble flotation

Technical Report · Wed Aug 01 04:00:00 EDT 1990

OSTI ID:5993969

Yoon, R H; Adel, G T; Luttrell, G H; Mankosa, M J

The main objective of this project was to demonstrate the microbubble column flotation process in a process development unit (PDU). In order to accomplish this task, the project was divided into several different stages. The first involved continuous bench-scale testing in order to identify the operating parameters which most strongly influence column performance. These included feed rate, countercurrent wash water rate, aeration rate, frother addition, collector addition and froth depth. Several tests were also conducted using different feed particle size distributions. Based on the results from these tests, several PDU-scale columns were designed and constructed. The second stage consisted of testing of the PDU-scale columns for the purpose of: (i) demonstrating the feasibility of the microbubble flotation process for producing superclean coal, (ii) demonstrating the ability of the microbubble column to process refuse streams (i.e., cyclone overflow material), (iii) comparison with conventional techniques for coarse coal flotation, and (iv) collecting scale-up data for the design of commercial-scale columns. Detailed results from each of these series of tests are presented. In the final stage of this work a comprehensive scale-up procedure was developed based on the fundamental principles of flotation. Expressions were developed which describe the flotation rate constant, mean retention time, fractional air hold-up and column mixing. These relationships were incorporated into a scale-up procedure based on known principles of chemical engineering reactor design. PDU-scale test results were used to validate the scale-up procedure. 95 refs., 141 figs., 23 tabs.

• Research Organization: Virginia Center for Coal and Minerals Processing, Blacksburg, VA (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC22-86PC91274
• OSTI ID: 5993969
• Report Number(s): DOE/PC/91274-T1; ON: DE91008418
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
ADDITIVES
AERATION
BENCH-SCALE EXPERIMENTS
BITUMINOUS COAL
BLACK COAL
BUBBLES
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
COAL
COAL PREPARATION
COAL PREPARATION PLANTS
CONCENTRATORS
CYCLONE SEPARATORS
DATA
DATA ANALYSIS
DEASHING
DESIGN
DOCUMENT TYPES
ENERGY SOURCES
EQUIPMENT
FLOTATION
FLUID FLOW
FOSSIL FUELS
FUELS
FUNCTIONAL MODELS
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
INERTIAL SEPARATORS
INFORMATION
LIQUID FLOW
LOADING RATE
MATERIALS
MATHEMATICAL MODELS
OPERATION
OPTIMIZATION
OXYGEN COMPOUNDS
PARTICLE SIZE
PERFORMANCE TESTING
PILOT PLANTS
POLLUTION CONTROL EQUIPMENT
PROCESS DEVELOPMENT UNITS
PROGRESS REPORT
SAMPLE PREPARATION
SEPARATION EQUIPMENT
SEPARATION PROCESSES
SIZE
SURFACTANTS
TESTING
WATER
WETTABILITY