thickener and reduce polymer dosing levels in the slimes thickener and tailings applications. The impact of lime addition on polymer dosing, together with the effect of lime on tailings consolidation properties is
The utility model discloses a dry ironore tailings discharging and recycling device. The device comprises a concentrating mill, a settling basin and a thickener which are respectively connected through a pipeline to form a closed circuit, wherein a discharge pipe connected with the concentrating mill is accessed into a feeding hole of the thickener; an overflow pipe connected on the thickener
Mine tailings disposal, and its impact on water usage, is an important concern for any mining company. The challenge today, whether extracting aluminum, zinc, gold or iron ore, is how to dispose of tailings material such that it is contained and stable, while maximizing water reuse and minimizing
Thickened and Paste Tailings Pipeline System Design Procedure Part 1, Page 3. The format of the design document varies, but will generally include the sections discussed below. 2.1 General. The function of the system is defined with a basic description of the process. This section also includes The design battery limits.
Conventional Thickeners are generally incorporated in heavy duty applications when the underflow density is high and substantial torques are required to convey the settled solids from the periphery to the central outlet for pumping away.
Thickener unit area was determined to be 9.6 m 2 /(t/h) using the TalmageFitch method. For the feedrate of 25 t/h (dry solids) to the thickener and using a safety factor of 1.25, the diameter of the thickener was calculated to be 21.9 m .
Outotec174; Thickened tailings and Paste Solutions A thickened tailings or paste disposal area is designed to store solid and little excess water. Recovery of the same time ensures the function of the thickener. Pressure (Pa) Displacement pump House pump Multiple centrifugal pump Single centrifugal
Paste/thickened tailings is characterized by the presence of a yield stress, which is the force required to initiate flow. The underflow of highrate thickeners is quot;slurry,quot; which has
mized density being pumped to the tailings dam. 2. The hindered/fluffy layer was used to monitor the deviation distance between it and the heavier compact bed. As the deviation moved greater than a set distance flocculent dosing increased. As the deviation decreased flocculent dosing decreased.
The application of fullfunction highpressure filter presses in tails dewatering G Mar233;, S Opperman, ENPROTEC, South Africa Process water conditioning to improve tailings thickening and filtration A Vietti, Vietti Slurrytec (Pty) Ltd, South Africa
On a subjective basis, tailings discharged from plants where thickeners are not utilised would conform to lowdensity slurry and the underflow from most well operated plant thickeners and other earlier generation thickeners
Depending on the type of tailings storage facility (TSF), the particle size distribution (PSD) can greatly influence the cost of dams and need for borrow materials, as well as the geotechnical properties and geochemical behavior of the system. For mines requiring backfill, rheology and strength are also a function of PSD.
A conventional tailings pond is designed to store both the solid and water of the tailings, where the solids segregate and settle and process water is stored and recovered. A thickened tailings or paste disposal area is designed to store solid and little excess water. Recovery of process water is done in the thickener prior deposition.
thickener, the centrifuge generates a centrifugal force, which is from a few hundred to several thousand times greater than the force of gravity. While the capacity of a thickener is a function of its surface area, the capacity of a centrifuge is a function of the liquid surface area multiplied by the g force.
Feb 18 Tailings Directive 074 Explained The shear strength of fine tailings is mostly a function of water content. A shear strength of 5 kPa equates to approximately 65% solids and 35% water. Thickeners require very steady operation which can be difficult in a process that have a very variable feed stream.
In paste tailings the percent of solids in the tailings slurry is increased through the use of paste thickeners to produce a product where the minimal separation of water and solids occurs and the material is deposited into a storage area as a paste (with a consistency somewhat like toothpaste).
Mill tailings management high density thickened slurries. By Gordon McPhail, Technical Director, SLR Consulting Australia Pty Ltd The most common method of watersolids separation is by means of thickeners which rely on flocculant and/or coagulant addition to the slurry entering the thickeners to aggregate fine particles, as
Theory and application of thickener design. Author links open overlay panel A.G. Waters K.P. Galvin. Show more. A case study shows the effect of various fine coal desliming options on a tailings thickener underflow density and pumping requirements. The height of this interface is plotted as a function of time and a batch settling test
A description of the sedimentation process during dynamic thickener operation A.J. Vietti and F. Dunn 2 Paste 2014, Vancouver, Canada consolidation theory was applied to the settling of compressible slurries (Shirato et al., 1970) which led
Copper tailings samples were prepared using a pilot scale thickener. Several flocullant types and dosages were used to produce a range of underflow concentrations. The following test work was conducted. 3.1 Tailings properties Tests were conducted to determine the material properties of the copper tailings samples, as indicated below.
For surface disposal applications, sulphide flotation concentrate tailings may be treated separately from nonsulphide tailings, depending on the significance and species of sulphides, the potential for metal leaching or acid generation, and synergies that may be exploited with the nonsulphide tailings (buffer capacity).
Thickening involves the conversion of dilute tailings to pastelike materials with superior engineering and environmental properties. The process of tailings thickening is not wellunderstood in geotechnical engineering. The primary objective of this paper was to model the dewatering behavior of slurries during thickening.
However, there are significant advantages to thickening tailings. Perhaps the most important is that higher volumes of water can be recovered and the seepage and evaporation losses from the tailings storage facility can therefore be minimised. Sustainable water use in the mining industry is becoming increasingly more important
Setting problems occur within the Thickener when Ore bodies are changed in the process. One of the biggest problems to an efficiently operating Tailings Thickener is the lack of automatically dosing the flocculant,
Gravity thickening, with the advantage of water recycling, is a conceptually simple and effective means of producing high concentration material for backfill and disposal. In the operation, the tailings slurry is fed to a gravity thickener via a feedwell where the flocculant solution is pumped to increase the size of the aggregates.
Neither the tailings thickener, nor the coarse vibratory screen could function at their designed performance. Recirculating Load The dewatering screen was installed with a sieve size of 300 microns, meaning that any particle
In order to assess the impact of the additional solids loadingcreated by deslimingon the thickener operation, sedimentation tests were carried out on samples of tailings and simulated deslimed flotation feed mixed with tailings.
Gravity thickeners are widely used for the dewatering of concentrates and concentration of tailings in dressing plants. They are mainly composed of thickening tank, rake, gearing device, rake lifting device, feeding device, unloading device and signal safety device.
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