Designing the Siilinjärvi thickened tailings storage facility
of apatite concentrate, and about ten million tons of tailings. For the past 15 years, tailings from the mine have been discharged into the Musti tailings storage. This is a ... Thickening technology has made some major progress during the past 20 years, and Yara sought to explore
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Yara Siilinjarvi ACT thickener optimizer
About one million tons of apatite concentrate are produced annually, creating approximately 10 million tons of tailings per year. Background of the project. ... In particular, the high content of coarse, flake-like mica strongly influences both thickening and pumping performance. 2. Milling circuits - The mills operate with 24-hour ...
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Mineral composition of apatite-nepheline ore.
When analyzing the statistical plan, it was estimated that the maximum grade of the valuable component in the concentrate (P2O5 = 31.23 %) and the recovery to concentrate of 95.22 % were obtained ...
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Separation of Rare Earth Elements from Phosphogypsum
The apatite concentrate obtained from flotation tailing of Iran's Chadormalu mine was used as the primary material for PG production. Sulfuric acid (97% Merck), nitric acid (65% Merck) and deionized distilled water were used for preparation of leaching solutions. The leaching experiments were performed in a three-neck round-bottom flask ...
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Advanced process monitoring and control methods in mineral …
Separation characteristics in a pyrite concentrate case and in a ground apatite ore case were studied with the model. Operation of a thickener was modeled based on on-line mass-balance estimation. The monitoring application was implemented in an …
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Soft-Sensor Estimation of an Apatite Thickener Operation at the
Therefore, disturbances in thickening can lead to increased filtration costs or even reduced plant throughput. Here, a Kalman filter based soft-sensor for an apatite concentrate thickener at the Siilinjärvi concentrator was set up. The aim is to monitor the thickener operation, especially changes in the solids mass in the thickener, and ...
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Surface tension of flotation solution and its influence on the
thickening, the ore was dried (at <60DC) and homogenized. Information on ore mineralogy is shown in Table 1, whereas chemical composition, particle size distribution and liberation degree are depicted in Table 3. Liberation degree of apatite was ... sary to concentrate apatite before gamma flotation experiments.
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Texture and Mineral Composition of Magmatic Apatite-Nepheline …
The paper considers the relationship between textural and structural features and gross mineral and chemical composition of minerals and the physical properties of apatite-nepheline ores and their ...
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OneMine | Optimising the operation of paste thickening at the …
The new high-density tailings disposal system with two paste thickeners increased the percentage of solids in the slurry from 45–48 per cent to 66-68 per cent, making it possible …
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Optimising the Operation of Paste Thickening at the Yara …
The site annually produces one million tons of apatite concentrate, which creates approximately 10 million tons of tailings. Extending the lifespan of the 1150-hectare tailings …
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Recovery of Rare Earth Elements from an Apatite Concentrate
The leaching of rare-earth elements, phosphorus, and alkali metals from phosphodihydrate, obtained in processing of the Khibiny apatite concentrate into mineral fertilizers, with sulfate solutions … Expand
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PRODUCTION OF APATITE CONCENTRATE FROM FINE …
desliming and thickening circuit. The secondary slimes are fine rebellious mineral fractions and oxidized inclusions removed from mineral surface. The following apatite flotation comprising two recleaning and two control stages yield the conditioned apatite concentrate and …
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Optimisation of paste thickening at the Yara Siilinjärvi plant
The new high-density tailings disposal system with two deep cone-type paste thickeners increased the percentage of solids in the slurry from 45–48% to 66–69%, making it possible to …
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The Recovery of Rare-Earth Elements from Apatite Concentrate …
According to the results for extraction of lanthanides from apatite concentrate, a two-step leaching process is suggested; in first step, apatite concentrate is leached with pure sulfuric acid at ...
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APATITE CONCENTRATE, A POTENTIAL NEW SOURCE …
APATITE CONCENTRATE, A POTENTIAL NEW SOURCE OF RARE EARTH ELEMENTS Tianming Sun1, Mark William Kennedy2, Gabriella Tranell2 and Ragnhild E. Aune2 1Department of Materials Science and Engineering, Royal Institute of Technology (KTH), Stockholm, SWEDEN 2Department of Materials Science and Engineering, Norwegian University of Science and …
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Optimising the operation of paste thickening at the Yara
The new high-density tailings disposal system with two paste thickeners increased the percentage of solids in the slurry from 45-48 per cent to 66-68 per cent, making it possible to deposit as a …
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Recovery of Rare Earth Elements from an Apatite Concentrate
Rare earth elements (REE) are a group of 17 elements including lanthanides, yttrium and scandium; which are found in a variety of classes of minerals worldwide. The criticality of the application, ...
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Concentrate Thickener Operation
In mining, when flotation is finished with the ore, and a final concentrate has been produced, often, both products will go to a concentrate thickener before. 911 Metallurgist is a trusted resource for practical insights, solutions, and support in mineral processing engineering, helping industry professionals succeed with proven expertise ...
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Flocculation, dewatering and sedimentation behaviour of mine …
1000,000 t/a of apatite concentrate, and about 10,000,000 t/a of tailings ... During the thickening process of tailings, due to the different sedimentation mechanisms of mud and sand, flocculants such as iron salts, aluminum salts, or inorganic polymers, which mainly function by compressing double electric layers, ...
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Efficient recovery of rare earth elements from apatite concentrate …
This study proposes a pre-leach stage to extract non-REEs and enrich the REEs in the residue from apatite concentrate (AP) containing 1.28 % REEs. Over 98.9 % calcium and 98.1 % phosphorous were leached in a solution of 2.18 M HNO 3, at 45 °C and a solid/liquid ratio of 10 % (w/v) after 40 min. In the same experiment, the leaching efficiency ...
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Data analysis of a paste thickener
Thickening is the most economical of several dewatering techniques. The thickening process normally occurs in large-diameter tanks where solid particles settle under the influence of gravity, i.e. sedimentation. ... The product of the ore extracted from the open pits is apatite concentrate, from which fertilizers and phosphoric acid are the ...
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Apatite Concentrate, A Potential New Source of Rare Earth …
Apatite, Ca 5 (PO 4 ) 3 F, concentrate from LKAB in Kiruna, Sweden, has been characterized and pyrometallurgically treated using (i) silicon metal and fluxes to extract phosphorus and transition ...
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Optimising the operation of paste thickening at the Yara
The Yara Siilinjrvi plant is located in the central part of Finland. Siilinjrvi is Western Europe's only apatite mine and annually it produces 1 Mt of apatite concentrate, which creates approximately 10 Mt of tailings.At the beginning of 2017, tailings handling in Yara Siilinjrvi was brought to a new era, by replacing the conventional tailings storage facility with a new tailings treatment ...
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Data analysis of a paste thickener
The aim is to investigate the behaviour and variables that affect the paste-thickening vessel in order to make the operation cost-efficient. Thickening is the most economical of several …
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-a) Apatite crystals are associated with muscovite, …
When analyzing the statistical plan, it was estimated that the maximum grade of the valuable component in the concentrate (P2O5 = 31.23 %) and the recovery to concentrate of 95.22 % were obtained ...
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Soft-Sensor Estimation of an Apatite Thickener Operation at the
In many cases, after a concentrate thickener, the slurry is fed to a filtration section. Therefore, disturbances in thickening can lead to increased filtration costs or even reduced plant throughput.
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OneTunnel | Optimising the operation of paste thickening at the …
The Yara Siilinjärvi plant is located in the central part of Finland. Siilinjärvi is Western Europe's only apatite mine and annually it produces 1 Mt of apatite concentrate, which creates approximately 10 Mt of tailings.At the beginning of 2017, tailings handling in Yara Siilinjärvi was brought to a new era, by replacing the …
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Soft-Sensor Estimation of an Apatite Thickener Operation at the
Here, a Kalman filter based soft-sensor for an apatite concentrate thickener at the Siilinjärvi concentrator was set up. The aim is to monitor the thickener operation, especially …
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Pyrometallurgical Treatment of Apatite Concentrate with the …
Apatite, Ca5(PO4)3F, concentrate from LKAB in Kiruna, Sweden, has been characterized and pyrometallurgically treated using (i) silicon metal and fluxes to extract phosphorus and transition metals at 1600 °C (Part I publication), and (ii) carbon to extract phosphorus without fluxing at temperatures exceeding 1800 °C (Part II publication), with the …
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Soft-sensor estimation of an apatite thickener operation at the
Soft-sensor estimation of an apatite thickener operation at the Siilinjärvi concentrator. Soft-sensor estimation of an apatite thickener operation at the Siilinjärvi concentrator. jarmo aaltonen. 2009, IFAC Workshop on Automation in Mining, Mineral and …
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