1. Impact of mechanical activation on physical and chemical properties of phosphorite concentrates

1.Impact of mechanical activation on physical and chemical properties of phosphorite concentrates

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  September 2011
  
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  International Journal of Mineral Processing 100(3):104-109
  

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  DOI: 
  
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  10.1016/j.minpro.2011.05.005
  

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  Tonsuaadu Kaia
  
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  Tiit Kaljuvee
  
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  Vilma Petkova
  
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  Kalle Kirsimäe
  
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  Abstract
  
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  The mineralogical and chemical composition of phosphorite concentrates from Tunisia, Estonia (from the Kabala and Toolse deposits), Uzbekistan (Dzheroi-Sardara) and Kazakhstan (Dzhanatas) as well as their apatite structures were studied before and after mechanical activation in a planetary mill for 5 to 240min. The specific surface area of these concentrates increased during the first 10–30min and thereafter decreased. The solubility of phosphorus increased proportionally with the size of the apatite crystallites. The changes in the physical and chemical properties following mechanical activation depend mainly on the mineralogical composition of phosphorite concentrates and on the structural characteristics of the apatite. Mechanical treatment in a planetary mill is more efficient in the case of sedimentary phosphorites, particularly Estonian phosphorites, and is less effective in the case of igneous phosphorites.
  

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  Inorganic Synthesis and Industrial Inorganic Chemistry
  
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  Published: 16 October 2012
  

2.Mechanical activation and reactivity of phosphate raw materials

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  N. V. Shul’ga 
  

Russian Journal of Applied Chemistry volume 85, pages1297–1306(2012)Cite this article

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  103 Accesses
  
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  1 Citations
  
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Abstract

Effect of mechanical activation of phosphate raw materials on the main characteristics of their subsequent decomposition with an aqueous solution of a weak acid and a complexing agent was studied. It was shown that, not being a versatile procedure, mechanical activation is rather efficient for well crystallized fluoroapatites, whereas for “soft” phosphorites its application is inappropriate.

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  3. Inorganic Synthesis and Industrial Inorganic Chemistry
  
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  Published: June 2007
  

Effect of mechanical activation on structural-chemical properties of phosphorites

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  B. G. Sukhov, 
  
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  D. Enkhtuyaa, 
  
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  Zh. Amgalan, 
  
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  T. I. Vakul’skaya, 
  
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  L. N. Novikova, 
  
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  Zh. G. Bazarova & 
  
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  B. G. Bazarov 
  

Russian Journal of Applied Chemistry volume 80, pages853–859(2007)Cite this article

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  45 Accesses
  
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  2 Citations
  
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Abstract

Effect of mechanochemical activation of mono-and mid-fraction of phosphorites from the Burenkhan deposit was studied by IR and ESR spectroscopies in vibration and planetary mills.

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JournalGeosystem Engineering Volume 19, 2016 - Issue 3

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Articles

Phosphorus fertilizer prepared from natural Burenkhaan phosphorite (Mongolia) by a mechanical activation

A. Minjigmaa,G. Oyun-Erdene,Ts. Zolzaya,B. Davaabal,J. Amgalan &J. Temuujin

Pages 119-124 | Received 17 Sep 2015, Accepted 28 Dec 2015, Published online: 27 Jan 2016

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  https://doi.org/10.1080/12269328.2015.1137501
  

 

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Abstract

Phosphorus is one of the most important nutrients for plant growth. The main compounds containing phosphorus are natural phosphate minerals such as apatite. However, the solubility of apatite is low in the humic acid in soil. Therefore, phosphorus is applied as a fertilizer for plant growth. Generally, fluorapatite Ca₅(PO₄)₃F is used for the preparation of phosphorus fertilizer such as superphosphate. Mongolia is rich in phosphorus reserves which are distributed between two phosphate basins at Khuvsgul (4.5 billion tonnes) and Zavkhan (1.2 billion tonnes). However, preparation of phosphorus fertilizer from natural fluorapatite, by a wet chemical method raises health and ecological concerns. Therefore, we have mechanically treated phosphorite from the Burenkhaan deposit in order to prepare fertilizer by a dry method. Phosphate samples were milled in a vibratory ball mill for 15–120 min. Raw and milled samples were characterized by XRD, FTIR, particle size analyzer and SEM. The efficacy of mechanical activation was determined by solubility of milled phosphate in a 2% citric acid solution. Mechanical activation results in a threefold increase in solubility of phosphorus in citric acid solution to 18%. Such solubility is comparable with the superphosphate prepared by the wet chemical method.

Keywords: Phosphorite, mechanical activation,