Abstract. The processing and storage of phosphatic clay suspensions (or mine tailings) which result as a waste product from phosphate mining industry represent an important economic and ...

An example is phosphate mining, where a typical phosphate mine generates a clay–water slurry, called phosphatic clay, at a rate of 8200 L/s with a solids content of 2–3 wt% [27]. McKinney and Orazem [ 64, 65 ] performed simulations of in-situ EKD of settling areas for phosphatic clay and concluded that a continuous process was …

A lab-scale struvite pellet crystallization system was used to study phosphorus (P) removal and recovery from sludge dewatering liquor (SDL). Influences of total suspended solids (TSS) and phosphate concentrations on P removal as well as the size, morphology, purity, and components of struvite pellets were investigated.

It serves as a conversion coating where the components are immersed in a hot dilute solution of phosphoric acid and phosphate salts which chemically react with the surface, forming a layer of insoluble crystalline phosphates. For greater corrosion resistance, a specially formulated dewatering oil is applied after the phosphating process, it is ...

The purpose of dewatering is to remove water from a material or structure so that it can be reused or disposed of in a safe manner. Without this process, many materials would be unusable or pose a safety hazard. Dewatering can be used for a variety of purposes, including: Lowering the water content of slurry prior to transport.

I claim: 1. Process for the treatment of a precipitate starting material to produce a first final product, said process comprising dewatering of the precipitate starting material, wherein the precipitate starting material is a precipitate based on at least one substance of a magnesium ammonium phosphate, a magnesium potassium phosphate or a potassium …

A cost-effective method for the treatment of reject water from sludge dewatering process using supernatant from sludge lime stabilization ... was applied before the phosphorus in sludge was recovered with the magnesium ammonium phosphate (MAP) process. As a result, the solubilization rate of excess sludge achieved approximately 80% and about 94 ...

Waste clay, a phosphate ore process tailing, contains a remarkable amount of critical materials such as P and REEs so that comparing to different phosphate ore process streams, waste clay presents the highest concentration of REEs after phosphate rock. ... The lowest power demand for a mechanical and electrokinetic dewatering …

Dry weight of immobilized beads and water removal efficiency in dewatering process with 24–25 °C temperature and 68–71% humidity, water removal percentage at 97% is marked in red for comparison (d). ... Nitrogen was necessary for promoting phosphate removal at low N/P (Kube et al., 2018), so phosphate was removed 80% …

It is very difficult to dewater, and the phosphate industry leaves about 40% of mined land in unstable clay settling areas. Extrakt has developed the technology to meet the challenges faced by operators. Learn more about Extrakt Process Solutions' patented technology for dewatering tailings with considerable advantages over current standards.

during the mining and processing of the phosphate rocks. Other examples of slow settling suspensions include red mud, acid mine drainage sludge, and coal slimes. Large ...

Optimal acid pH of 3.0 was proposed for satisfied phosphate recovery. • Total dissolved phosphate was 37.3-flod higher than that at natural pH. • Phosphate was primarily obtained from degradation of short chain polyP. • WAS dewatering performances were improved after acid treatment. • Released P was recovered in form of FePO 4 …

The reason that the dewatering process is so heavily regulated by both the federal and state government is simple: untreated water removed from construction sites during dewatering operations may contain certain pollutants that could negatively impact local natural water courses or storm drainage systems. ... such as nitrogen and …

The advanced anaerobic digestion process enhances sludge resource utilization. However, thermal hydrolysis pretreatment of anaerobically digested sludge reduces dewatering efficiency due to excessive organic matter decomposition. This necessitates significant time and effort for sludge conditioning in wastewater treatment …

The phosphate ore processing can be divided into three stages: crushing—separation—concentrate dehydration. 1. Ore crushing process includes crushing, screening, grinding and grading processes. Use crushers and ball mills to reduce ore particle size to dissociate phosphorus minerals from impurity mineral monomers.

1. Introduction. Currently, the recovery and reuse of phosphorus (P) from wastewater is only considered viable for the return liquors from digestion or dewatering operations. However, it may also be extracted directly from sludge by acidification. P exists in different forms in sludge, namely: chemically-bound.

Abstract. At Harnaschpolder wwtp phosphate removal from wastewater and sludge dewatering is optimised by dosing magnesium hydroxide to digested sludge. To …

As an alternative process to chemical struvite precipitation, a recent study demonstrated the ability of selected bacteria to form bio-struvite in activated sludge liquors and in dewatering ...

The process for electro-sedimentation, dewatering and consolidation of Florida phosphate slime by the process of placing an anode at the bottom of a holding facility for the storage of the phosphate slime; filling the holding facility with phosphate slime; placing a cathode on the surface of the solid portion of the phosphate slime but below the surface of any …

The valorization of phosphate mine waste (PMW) in different fields has recently become attractive to many researchers. This review paper examines the potential use of PMW as a raw material in different applications toward sustainable management strategies. Dewatering, recovery of phosphate and heavy metals, building materials …

Optimization of phosphorus removal from reject water of sludge thickening and dewatering process through struvite precipitation. Weichao Ren., Zhen Zhou., Li Wan., Dalong …

By David BardsleyApril 12, 2022. Construction dewatering is the process of removing groundwater from a construction site to provide a safe and stable subgrade for excavation. Groundwater is removed from the site using deep wells, wellpoints, eductors, or conventional "sump and pump" methods. Dewatering may be temporary during …

Construction dewatering methods refer to techniques such as wellpoints, deepwells, bypass and flood control. In wellpoint and deepwells submersible pumps are installed in a drilled well shaft, while in bypass and flood control pumps are placed in the area that needs to be dewatered. Let's review these common techniques.

Precipitates transformed from hydroxyapatite to tri-calcium phosphate with rising pH. Abstract. This paper describes a cost-effective method for phosphorus removal from reject water of sludge dewatering process by using supernatant from sludge lime stabilization (SLS) processes, which are extensively used in China. ...

The daily growing demand for critical materials has further highlighted the importance of secondary sources such as industrial waste streams. Waste clay, a phosphate ore process tailing, contains a remarkable amount of critical materials such as P and REEs so that comparing to different phosphate ore process streams, waste clay …

Phosphorus removal using lanthanides, cerium and lanthanum, remove phosphorus by forming a precipitate mineral with the phosphate that is very dense. This mineral precipitates quickly and easily, without forming a floc …

The research described includes early dewatering experiments, fundamental studies of clays and of flocculation, and minor dewatering techniques such as freeze-thaw …

Currently, the recovery and reuse of phosphorus (P) from wastewater is only considered viable for the return liquors from digestion or dewatering operations. …

The enhanced biological phosphorus removal process makes the phosphorus recovery feasible from the dewatering streams of biological sludge. The …

In this methods of dewatering, a wall of frozen clay is made by, freezing the moist soil of the area where the excavation is to be carried out.. The process of freezing method of dewatering is as follows:. Large pipes of 10 to 15 cm diameter are laid in the ground around the area where excavation is to be done. The spacing between such …