phosphatic clay behavior

Phosphatic Clay Behavior

Heavy Metal Interactions with Phosphatic Clay: Sorption ...

desorption behavior of phosphatic clay with respect solutions were 4.06, 4.36, and 5.72, respectively. All chemicals to heavy metals. Phosphatic clay is a heterogeneous used in these experiments were analytical reagent grade. mixture of several minerals, which interact with heavy All metal sorption studies were performed using batch ex-

Evaluation of Phosphatic Clay Disposal and Reclamation ...

Highly stone phosphatic clays displayed a higher void ratio, lower solids content, and greater compressibility at the same effective stress than clays of lower plasticity. The coefficient of permeability of phosphatic clays generally conformed to expected behavior with the higher plasticity clays displaying a lower coefficient of consolidation and plasticity was evident.

EVALUATION OF PHOSPHATIC CLAY

of three of the six phosphatic clays and corresponding sand-clay mixes was then subsequently undertaken. The results are presented in Volumes 4 and 5 titled “Consolidation Behavior of Phosphatic Clays” and “Shear Strength Characteristics of Phosphatic Clays”, respectively. Concurrent with the laboratory evaluation of phosphatic clay engi-

Reclamation of Phosphatic Clay Waste Ponds by Capping ...

The consolidation behavior of phosphatic clays taken from 19 sites located in central and northern Florida is investigated to address the problem of disposal of waste clays generated in the beneficiation process within the Florida phosphate industry. Uncapped, capped, and sand/clay mix centrifuge tests were run on each waste clay.

Reclamation of Phosphatic Clay Waste Ponds by Capping ...

In the case of gypsum addition, the consolidation magnitude was enhanced. Consolidation occurred more quickly, and final effective clay solids contents approached those of untreated clay. The behavior of clay/gypsum mixtures is similar to that for sand/clay mixes. Reclamation of Phosphatic Clay Waste Ponds by Capping. Other Volumes

EVALUATION AND PHOSPHATIC CLAY DISPOSAL AND …

Laboratory evaluations of the engineering properties of phosphatic clays and sand-clay mixes were performed on phosphatic clays from twelve different mine sites. Volumes 1, 2 and 3 titled “Index Properties of Phosphatic Clays”, “Mineralogy of Phosphatic Clays”, and “Sedimentation Behavior of Phosphatic

Phosphatic-Clay - Uses, Mining, Technology, Process ...

Phosphatic clay sediment in the ponds have a higher level of radioactivity than sediment in natural lakes, but the water is like other lake water. When the pond settles the soil has higher levels of radioactivity than normal soil.

Reclamation of Phosphatic Clay Waste Ponds by Capping ...

Volume 2: Centrifugal Modeling of the Consolidation Behavior of Phosphatic Clay Mixed with Lime or Gypsum. University of Florida. April, 1988. FIPR Publication No. 02-030-062 Volume 3: Evaluation of the Use of Geotextiles for Capping Phosphatic Waste Clay Ponds. University of Florida. April, 1988. FIPR Publication No. 02-030-075

CONTROL OF FLORIDA RED TIDES USING PHOSPHATIC CLAY

Rather than look upon the phosphatic clay as a waste, the Florida Institute of Phosphate Research considers the phosphatic clay a byproduct that potentially has other uses. In addition to the topic of this report on the use of phosphatic clay as an agent to help control red tide algae through the process of flocculation and settling, phosphatic ...

UTILIZATION OF PHOSPHATIC CLAY WASTE IN CONCRETE

phosphatic waste clay for each ton of phosphate rock produced. Based on this ratio, over 1.5 billion tons of phosphatic clays have been generated by the Florida phosphate industry. Now that most high-quality ore has already been mined, the concentration of phosphate in the waste phosphatic clays is often higher than that in the remaining matrix.

Understanding Phosphorus Behavior in Soils

Jan 01, 2002 · In nature, phosphorus is always found in combination with oxygen in the phosphate form. This stone form allows the molecule to react with up to three single positive ions such as hydrogen (H +), potassium (K +), or ammonium (NH 4 +) or …

Heavy metal interactions with phosphatic clay: Sorption ...

Heavy metal interactions with phosphatic clay: Sorption and desorption behavior Article in Journal of Environmental Quality 30(6):1961-8 · November 2000 with 260 Reads How we measure reads

Clay Dewatering - Clay Flocculation - Settling - Thickening

Collectively, phosphatic clay is composed of minus 150-mesh particles of clay, quartz, and phosphatic materials that are rejected during beneficiation. Generally, phosphatic clay slurries containing 3% to 5% solids are impounded behind dikes, which are built around mined-out pit areas.

SUBSIDENCE OF SUSPENSIONS OF PHOSPHATIC SLIME AND …

The colloidal behavior of the phosphatic clay suspensions is believed to be due to montmorillonite and attapulgite. As the latter mineral is fibrous in nature, it was decided to incorporate in …

Cyprinodon - an overview | ScienceDirect Topics

These results suggested that the use of phosphatic clay may not be any worse (or better) than what may occur during an untreated bloom. Shumway et al. (2003) examined the impacts of yellow loess (now called yellow clay) on the clearance rates of some commercially important bivalve molluscs (Crassostrea virginica, C. gigas, Mytilus edulis, M.

The physico-chemical properties and leaching behaviors of ...

The phosphatic clay was obtained from Vietnam mining, with the 0.15–0.075 mm sized portion used in this research. The elemental composition and mineralogy of the phosphatic clay were determined using XRF (X-ray fluorescence-Philips PW2404) and XRD (X …

The aggregation of clay minerals and marine microalgal ...

Sep 01, 2001 · The highest removal was achieved by thoroughly mixing the clay slurry (e.g. phosphatic clay) into the cell culture. The RE by phosphatic clay varied significantly in a survey consisting of 17 different species from five algal classes. Moreover, the removal trends varied substantially with increasing cell concentration.

Microstructure of clay fabric in electrokinetic dewatering ...

Jun 15, 2018 · 1. Introduction. Clay minerals (e.g. montmorillonite and kaolinite) are common waste products in the mining industry and have diverse structural and physical properties, such as anisotropic shape, large surface area, and varying types of charges (McFarlane et al., 2005).When dispersed in an aqueous media, the clay minerals exhibit a low dewatering rate due to formation of porous structures …

NIOSHTIC-2 Publications Search - 10002651 - Application of ...

A semiempirical equation used to describe the compaction of ceramic powders in a single-acting die was applied to aqueous phosphatic clay waste and attapulgite slurries. This equation, v* = a1e-k1/p + a2e-k2/p, was found to describe the compaction of an attapulgite gel and a phosphate …

Characterization of aqueous lead removal by phosphatic ...

Aug 25, 2006 · The favorable phosphatic clay characteristics such as neutral pH, high cation exchange capacity (CEC), presence of natural apatite and smectite suggests that it could be a cost effective sorbent for the removal of aqueous heavy metals from contaminated water as well as for in situ stabilization of heavy metal contaminated soils and sediments,.

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