dewatering phosphate clay
The Bureau of Mines, U.S. Department of the Interior, as part of its mission to effect pollution abatement, conducted research to devise means for disposing of phosphatic clay wastes and reclaiming mined land. Part of the investigation was performed in a cooperative research project with 10 phosphate …
clay mix that can keep their integrity after going through hydrocyclone, screen and screw classifier. Overall, this project demonstrated that it is possible to mine Florida phosphate without the need for clay settling ponds by instantaneous reclamation of mine cuts using a high-solids sand-clay-overburden mix.
Request PDF on ResearchGate | Development of Electrokinetic Dewatering for Phosphate Mine Tailings | Solid-liquid separation represents a significant problem for the phosphate mining industry. A ...
May 01, 2000· Dewatering of Phosphatic Clay Waste by Flocculation Dewatering of Phosphatic Clay Waste by Flocculation Rahman, M. K. Abd‐El 2000-05-01 00:00:00 This work focuses on the dewatering of phosphatic clay waste of Egyptian Abu‐Tartur phosphate ore by flocculation using polyacrylamides to enhance the dewatering rate and recycling of the process water.
Mar 01, 2019· Phosphate ores have been mined in Florida since the late 1800s, and Florida generates approximately two thirds of mined phosphate in the United States . The phosphate deposits consist of phosphate ore, clay, and sand in approximately equal proportions . The beneficiation of phosphate ore is achieved by froth flotation.
"The U.S. Bureau of Mines conducted research to determine the effect of ground water control on the dewatering of phosphatic clay wastes. Two storage impoundments were constructed. One impoundment was surrounded on three sides with a series of well points (shallow vertical wells) to lower the ambient water table, and the second impoundment ...
design of electrolytic dewatering systems for phosphatic clay suspensions by james patrick mckinney a dissertation presented to the graduate school
and KMn04, which rendered the clay waste treatable with FIGURE 5.—Small-scale static and trommel screen dewater- ing of phosphate clay waste. Table 1. — Dewatering phosphate-clay waste using hydrosieve and trommel screen combination Discharge, pct solids PEO Conc., pct 0.01 .005 .0025 Dosage, lb/st 1.0 .55 .53 Hydrosieve 10.0 12.1 Trommel ...
Clay settling and dewatering : Background : Clay is part of the matrix mined by phosphate companies. The matrix contains roughly equal parts of sand, clay, and phosphate. The finest particles of clay, sand and phosphate are separated in cyclones during the first stages of beneficiation.
WELL POINT DEWATERING OF PHOSPHATIC CLAYS By C. W. Smith1 and J. T. McLendon2 ABSTRACT The U.S. Bureau of Mines conducted research to determine the effect of ground water control on the dewatering of phosphatic clay wastes. Two …
The Bureau of Mines, as part of its mission to effect pollution abatement, conducted research to develop a technique for dewatering phosphate clay waste from disposal ponds. Phosphate clay waste was dewatered from 11.8 pct to greater than 20 pct solids using 0.53 Lb of polyethylene oxide (peo) per ...
The poor dewatering characteristic of phosphate clay dispersions is a major challenge for the phosphate mining industry. For example, in Florida (USA), large amounts of water (mostly groundwater) is consumed for the beneficiation process (i.e. separating phosphate rock from clay and sand); ...
Recognizing these problems long before the age of environmental awareness, the phosphate companies have almost continually sought answers to the problem of clay dewatering. Millions of dollars and uncountable hours have been spent by the industry, the Bureau of Mines, and private and other governmental researchers on the phosphatic clays problem.
as the f10ccu1ant in all dewatering speed affected the dewatering. Since the tests. The polymer is a linear, non~ character of clay waste changed from hour ionic, water-soluble molecule composed of to hour, the results of individual tests repeating units of CH2 CH2-O and having a …
A dewatering method using PEO as a flocculant has been successfully used to dewater bentonite clay waste, coal-clay waste, and phosphate clay waste. In field tests, phosphate clay waste has been dewatered from 2.5 percent solids to greater than 20 percent solids.
Abstract. A mathematical model is presented for the electrokinetic dewatering of suspensions of phosphatic clays. The modeling approach couples a boundary-element model for solution of Laplace's equation to a recently developed constitutive equation that relates the change in solids content with applied electric field and time.
Phosphatic clay waste is one of the principal waste products resulting from the mining and benefication of Florida phosphate ore. This waste material, which is comprised of ultrafine particles (70 pct less than 1 µm), responds poorly to conventional solid-liquid separation techniques and is currently disposed of by impoundment behind earthen dams.
At this degree of consolidation, the volume of clay waste, mixed with sand from the phosphate beneficiation sequence, would fit back into the mine cut, thus eliminating the need for aboveground storage. Recently, the Bureau of Mines has developed a dewatering technique for phosphatic clay waste.
The Bureau of Mines is testing a dewatering technique for phosphate clay waste that will recover a portion of the water now being lost using conventional waste disposal methods and produce solids suitable for land reclamation. The techniques uses a flocculant, polyethylene oxide (peo), that forms ...
The Florida Institute of Phosphate Research (FIPR) has supported bench- and pilot-scale studies to determine the technical and economic feasibility of a variety of processes to speed the dewatering of clays associated with phosphate mining.
A semi-continuous electrokinetic dewatering process, representing an intermediate step in development of a technology for continuous electrokinetic dewatering of phosphatic clay suspensions, was ...
The rate at which peo-treated material continues to dewater in a mine cut also was monitored. Preliminary results indicate that peo-treated material will dewater 30 pct solids in 140 days. Pretreatment of phosphatic clay waste with lime and h2o2 was shown to improve the dewatering technique for problem clay wastes.
Various examples are provided for electrokinetic dewatering of e.g., phosphatic clay suspensions. In one example, among others, a system includes a separation chamber including an anode and a cathode extending ends of the separation chamber and a power supply configured to energize the anode and the cathode to establish an electric field.
Sep 10, 2014· A semi-continuous electrokinetic dewatering process, representing an intermediate step in development of a technology for continuous electrokinetic dewatering of phosphatic clay suspensions, was designed and evaluated through measurement of supernatant turbidity, pH, and changes in solids content.
[RI[8928 PLEASE DO NOT REMOVE FROM LIBRARY Bureau of Mines Report of Investigations/1985 Large-Scale Dewatering of Phosphatic Clay Waste From Northern Florida By Annie G. Smelley and B. J. Scheiner UNITED STATES DEPARTMENT OF THE INTERIOR i""~J o~'d~ MINES 75TH A~
ELECTROKINETIC DEWATERING OF PHOSPHATIC CLAY SUSPENSIONS . CROSS REFERENCE TO RELATED APPLICATIONS  This application claims priority to and the benefit of U.S. provisional application serial no. 61/709,402 entitled "Electrokinetic Dewatering of Phosphatic Clay Suspensions" and filed on October 4, 2012, which is hereby incorporated by reference in its entirety.
The technique consists of treating the clay waste with a flocculant such as polyethylene oxide and dewatering the resulting flocs on a mechanical device such as a rotary screen. In small-scale continuous tests at the Bureau's Tuscaloosa Research Center, clay waste was …
The flocculation dewatering system was effective on clay-waste samples of different mineral compositions that were obtained from plants and deposits in the central Florida phosphate region. Successful dewatering tests were made in bench-scale batch tests and in continuous tests with a trommel as large as 0.5 meter in diameter by 5 meters long ...
Research Center and the Florida Institute of Phosphate Research (FIPR) entered into a Memorandum of Agreement, with total funding by FIPR, to review and assess the state-of-the-art of phosphatic clay handling and dewatering technology as practiced by the Florida phosphate industry. Over the past 20 years considerable research has been undertaken to
SETTLING OF SUPERNATANT FROM SEMICONTINUOUS ELECTROKINETIC PROCESSING OF PHOSPHATIC CLAY SUSPENSIONS By Pei-Han Chiu August 2012 Chair: Mark E. Orazem Major: Chemical Engineering Dilute suspensions of phosphatic clay, a waste product of the phosphate ore beneficiation, have been deposited in clay settling areas (CSA) in Central Florida for decades.
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