dewatering thickening effect of fine on paste thickener performance

Effect of Fine on Paste Thickener Performance - Thickening ...

The effect of feed fine fractions on paste thickeners performance. The application of paste thickeners has been on rise in mineral industries. The efficiency of compression in the bed is a determinant factor which affect dewatering efficiency in the paste thickeners. However, a number of parameters

Minerals Blog | Paste Thickening

Aug 23, 2019 · Mathematical models have been developed that present methods for sizing thickeners and predicting performance under varying process conditions. The compression effect of deeper beds on dewatering performance is a recognized phenomenon. This is one variable of many that are interrelated and influence thickener performance.

Paste thickening - Thickening, Filtering, CCD & Water ...

This paper describes the principles of design and general operating characteristics of the paste thickener. The application and operating performance of paste thickeners in surface disposal is discussed using iron ore tailings, as produced in a one meter paste thickener pilot plant, as an example.

Considering hydrocyclone operation for tailings dewatering ...

Using hydrocyclone in dewatering circuit does not mean the thickener and the filter are eliminated from the process. The two equipment will be processing hydrocyclone overflow stream. Such flow sheet may further enhance the performance of the overall circuit as less solid concentration is fed to the thickener.

(PDF) Reconstructed rheometer for direct monitoring of ...

The dewatering performance of the total tailings was greatly improved to a solid mass fraction of 75.33% in 240 min. ... 3.2.2.Effect of thickening time on shear stress and torque ...

Challenges and opportunities of hydrocyclone-thickener ...

Jun 15, 2018 · Effect of particle size and residence time on the thickener performance was studied. Increasing residence time due to the bed depth and settling flux was differentiated. The dewatering efficiency of the hydrocyclone-thickener circuit was estimated.

A study on model predictive control in paste thickeners ...

May 01, 2017 · Fig. 1 shows a schematic diagram for a continuous paste thickener. The paste thickener is fed with a slurry of flow rate Q F and solids concentration ϕ F, and the product underflow removed at a rate of Q D with solids concentration ϕ D from the bottom of the paste thickener. The overflow from the thickener Q F-Q D is recycled back to the plant, and is assumed to be free from

Paste thickening - Thickening, Filtering, CCD & Water ...

This paper describes the principles of design and general operating characteristics of the paste thickener. The application and operating performance of paste thickeners in surface disposal is discussed using iron ore tailings, as produced in a one meter paste thickener pilot plant, as an example.

WATER MANAGEMENT: Outotec introduces 2nd generation paste ...

May 13, 2019 · The new 2nd Generation Paste Thickener builds on this proven performance with a range of innovative new features. For example, vertical load monitoring with the Smart Rake Lift system means the Outotec Paste Thickener is one of the only systems in the world that can detect early formation of rotating beds, enabling counteractions to be taken early.

Tailings management Sustainable and complete dewatering ...

May 03, 2019 · The effect of grind size and ultra-fines on tailings dewatering ... paste thickening. Our Deep Cone® paste thickeners produce ... Technical challenges Producing paste tailings requires a very high performance thickener. Very large torque drives and rake must be provided to discharge the paste tailings from the thickener. Special care

Challenges and opportunities of hydrocyclone-thickener ...

Jun 15, 2018 · Effect of particle size and residence time on the thickener performance was studied. Increasing residence time due to the bed depth and settling flux was differentiated. The dewatering efficiency of the hydrocyclone-thickener circuit was estimated.

Paper: Shear effects in thickening

Abstract: One-dimensional computational dewatering models which account for the influence of networked particulate bed compression, have enabled accurate predictions of dewatering in sedimentation, centrifugation and filtration processes in both the laboratory and industry. However, in certain processes, such as gravity thickening, the models have been observed to under predict the performance ...

Paste Thickeners | McLanahan

Paste Thickeners can help producers eliminate the need for settling ponds and other structures. They are meant to achieve the highest solids concentrations possible through gravity separation. The resulting mud, described as a paste, is often so thick that it becomes non-segregating — no further separation of water and solids can be achieved. As a guide, a paste material is measured with a ...

Fluidization Analysis of Thickening in the Deep Cone for ...

Aug 05, 2020 · Cemented paste backfill (CPB) can effectively eliminate the risk of dam break in goaf and tailings pond which used tailings waste. Deep cone thickener (DCT) is an efficient machine for the system of paste preparation, and the concentration of slurry at the bottom is high and distributed unevenly, which will cause too much partial resistance and failure of thickener.

(PDF) Techniques and methodologies for improving thickener ...

Sep 29, 2003 · Developing fundamental understanding of all aspects of thickening was the focus of a long-term industry-sponsored research program (AMIRA P266 "Improving Thickener Technology", 1988Technology ...

Reconstructed rheometer for direct monitoring of ...

Mar 29, 2020 · To further clarify the dewatering performance and torque evolution during the tailings thickening process, a self-made rake was connected to a rheometer to monitor the shear stress and torque. The dewatering performance of the total tailings was greatly improved to a solid mass fraction of 75.33% in 240 min. The dewatering process could be divided into three stages: the rapid torque

Outotec looks for consistent and efficient dewatering with ...

May 13, 2019 · Outotec has introduced the 2nd Generation Paste Thickener to, it says, maximise underflow density regardless of challenging mineralogy and tailings feed-rate variation. The thickener enables consistent and efficient dewatering performance – even with changing process conditions, according to the company.

Enhancing sedimentation performance of clarifiers ...

Mixing the coarse and fine fractions can be minimized by separate pipe discharges into the C/T center-well to enhance performance. The laboratory test results show that the new dewatering process can prevent the formation of a fluffy flocculated layer on the top of the liquid in the sedimentation equipment and improve the dewatering performance.

A New Approach for Red Mud Disposal Based on Mineral

ponds, and before any dewatering treatment, thickening or filtration, it can contain more than 80 % water [2]. Due not only to environmental and safety issues, but also to water scarcity, there is a growing tendency to apply dry and semi-dry processes, such as paste production before disposal [2, 9].

(PDF) Steady state thickener modelling from the ...

Thickener dewatering performance search Centre of the Australian Research Council. predictions are then produced for each test condition based on the characterisation results. Comparison of the results quan- titatively predicts the effect of varying flocculant dose on Appendix A. Computational algorithm thickener performance.

Biosolids Technology Fact Sheet Gravity Thickening

Gravity thickener designs usually include circular tanks, 3-4 m (10-13 ft) deep and up to 25 m (82 ft) in diameter. The dimensions are based on prediction of settling due to gravity alone. To assist solids transport, gravity thickener bottoms are constructed with a floor slope between 1:6 and 1:3.

Paste Thickening: Considerations for Backfill vs. Tailings ...

Specifically the application of mechanical devices (dewatering, bulk-handling, transport, placement) and how to achieve the required characteristics for surface deposition, underground backfill or both (geotechnical, geochemical, environmental). One of the common misconceptions about paste thickening is “it won’t work at our facility.”

Paste Thickeners | McLanahan

Paste Thickeners can help producers eliminate the need for settling ponds and other structures. They are meant to achieve the highest solids concentrations possible through gravity separation. The resulting mud, described as a paste, is often so thick that it becomes non-segregating — no further separation of water and solids can be achieved. As a guide, a paste material is measured with a ...

Paper: Shear effects in thickening

Abstract: One-dimensional computational dewatering models which account for the influence of networked particulate bed compression, have enabled accurate predictions of dewatering in sedimentation, centrifugation and filtration processes in both the laboratory and industry. However, in certain processes, such as gravity thickening, the models have been observed to under predict the performance ...

tailings thickening Archives - International Mining

The thickener enables consistent and efficient dewatering performance – even with changing process conditions, according to the company. “Through consistent performance and high underflow density, the 2nd Generation Outotec Paste Thickener maximises beaching angle in the tailings storage facility to provide safer operations and maximised ...

Thickening and Filtration - Rheological-consulting ...

RCS has significant experience in conducting testwork for selection and operation of thickeners and filtration devices, and can assist in dewatering equipment selection by offering quantitative analysis methods to identify the optimal dewatering technique for a given process waste stream. Identification of suitability of process and waste streams for thickening, centrifugation or filtration ...

(PDF) Understanding the Thickening Process | Shane Usher ...

Figure 6 demonstrates the importance of testing under the appropriate conditions by showing the 18 Paste 2006, Limerick, Ireland Rheology and Thickening effect of shear through the thickener underflow pump and pipeline for a red mud paste. Using the thickener underflow rheology to design the pipeline system or deposition characteristics could ...

the polymer in thickener overflow floatation

Performance optimization of paste thickening Mika Kosonen Outotec Finland Sakari Kauvosaari Outotec Finland to detect the clarity of thickener overflow As such it does not directly tell the solids content but it can be re-circulated backwards in the process as flotation spray water the flotation performance was also disrupted get price

operating principle of thickeners

Pilot Paste Thickener :Testing The following is an example of the application of a paste thickener to fine coal dewatering In a coal preparation plant 260 mt/hr of fines (40 wt% less than 20 microns diameter) are thickened in a 35m diameter conventional thickener to

Ultimate Guide About Thickener - Mining-pedia

May 22, 2019 · The quality of thickener will directly affect the result of dewatering operation, and high-quality thickener will increase 20%-30% thickening concentration, then strengthen thickening result. In practice, the common thickening equipment includes: r ake thickener, high-efficient thickener, deep cone thickener, titled plate thickener.

Tailings Dewatering Technologies for Australian Coal ...

Improved thickener technology, in particular AMIRA P266. Tailings thickening using dual polymer, paste thickening, novel hyperconcentrators and small diameter hydrocyclones. Combined dewatering (mechanical plus other drying mechanism, including steam, infra-red, heat, vibrating and microwave) and other novel technologies.

dewatering Archives - Page 2 of 2 - International Mining

The thickener enables consistent and efficient dewatering performance – even with changing process conditions, according to the company. “Through consistent performance and high underflow density, the 2nd Generation Outotec Paste Thickener maximises beaching angle in the tailings storage facility to provide safer operations and maximised ...

Pore Connectivity and Dewatering Mechanism of Tailings Bed ...

Paste and thickened tailings (PTT) technology can improve the utilization and management of tailings from processing plants. The pore size distribution (PSD) and microstructure evolution affected by the rake shear in thickening tailings beds are essential to produce a high-density tailings underflow. Continuous thickening and computed tomography (CT) scanning tests were conducted to study the ...

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