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The extraction of potassium from K-feldspar via a calcium chloride calcination route was studied with a focus on the effects of the calcination atmosphere, calcination temperature …
LU L, LI C, ZHANG GQ, et al. Decomposition behavior of CaSO 4 during potassium extraction from a potash feldspar-CaSO 4 binary system by calcination[J]. Chinese Journal of Chemical Engineering, 2018, 26(4):838-844. doi: 10.1016/j.cjche.2017.10.001. CrossRef Google Scholar [13]
Potassium ion released from the silicate matrix combines with chloride ions to form potassium chloride, which solubilized in water during the leaching process of the roasted …
The extraction of potassium from K-feldspar via a calcium chloride calcination route was studied with a focus on the effects of the calcination atmosphere, calcination temperature and time, mass ...
To recover potassium from feldspar, a biowaste, i.e., eggshell, was used and the shrinking core model was applied to the roast–leach data, and diffusion through the product layer was inferred as the rate-determining step. To recover potassium from feldspar, a biowaste, i.e., eggshell, was used. The chief composition of eggshells is calcite. As it is a rich source of Ca, …
In this study, potassium extraction from K-feldspar ore with an 8.42% K2O content was studied using chloridizing (CaCl2) roasting followed by water leaching. Initially, to produce wollastonite and calcite concentrates, froth flotation tests were conducted on wollastonite-calcite ore after comminution. Thus, wollastonite and calcite concentrates ...
ABSTRACT The extractions of potassium value from feldspar via roasting and leaching route was studied with a focus on the effects of the roasting time, temperature, additives, and particle size. Sodium chloride and phosphogypsum (PG) were used as a source of chloride and calcium, respectively, and played the important role during the roasting of feldspar. When …
In the experiment performed at 100 ml scale for potassium leaching through Acinetobacter soli, out of 60 mg potassium present in the K-feldspar, 33.1 mg potassium is accumulated in the bacterial biomass and 5 mg potassium is released in the supernatant, or in other words, total leaching of 38.1 mg potassium was obtained out of 60 mg potassium ...
The extraction of potassium from K-feldspar via a calcium chloride calcination route was studied with a focus on the effects of the calcination atmosphere, calcination temperature and time, mass ...
The development of sintering,high temperature fusion,hydrothermal system and low temperature decomposition are reviewed,as well as their different mechanisms.A new sorting principle of potassium extraction mechanism,other than the technological properties is applied to systematize all the traditional methods.The advantage and disadvantage of these methods are …
The extraction of potassium from a tablet mixture of K-feldspar ore and CaSO 4 by roasting was studied with a focus on the effects of the decomposition behavior of CaSO 4 on the potassium extraction process. The roasted slags were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy, and …
In this new design, the efficient extraction of soluble potassium from the ore is the key step because potassium mainly exists in K-feldspar of the ore, while K-feldspar is very difficult to ...
Potassium ion released from the silicate matrix combines with chloride ions to form potassium chloride, which solubilized in water during the leaching process of the roasted feldspar. For elucidation of the mechanism of the roasting process, the shrinking core model was applied to the roast-leach data, and diffusion through the product layer ...
In this study, potassium extraction from a feldspar ore, which contained microcline, albite, muscovite, and quartz, was studied using chloridizing (CaCl2) roasting followed by leaching. Direct leaching experiments were also …
Potassium feldspar is a typical insoluble potassium ore with enormous deposits in China. Its industrial utilization has not been developed yet because of high costs and technological difficulties. ... The potassium extraction has been shown to reach 85% in the KAS 6-MgCl 2-CaCO 3 and KAS 6-CaCl 2-CaCO 3 systems, whereas the leaching rate was ...
Potassium solubilization activity at different temperatures In the experiment performed at 100 ml scale for potassium leaching through Acinetobacter soli, out of 60 mg potassium present in the K-feldspar, 33.1 mg potassium is accumulated in the bacterial biomass and 5 mg potassium is released in the supernatant, or in other words, total ...
A low-temperature molten salt-hydrothermal method was investigated by Wang et al. for the extraction of potassium from K-feldspar (Wang, 2018). In that study, the mixture of a low melting point sodium nitrate salt (T mp = 300 °C) and alkaline solution, NaOH, have been proposed to activate the K-feldspar structure in an autoclave reactor. The ...
Fig. 1 Flowsheet for potassium extraction from K-feldspar using dis-tiller waste and soda residue Fig. 2 XRD pattern of the K-feldspar sample Table 1 Chemical composition of K-feldspar [wt%] SiO ...
To date, various techniques have been developed to extract potassium from K-feldspar and produce a soluble potassium fertilizer. This review summarizes the main methods, i.e., the hydrothermal ...
The results were followed by potassium extraction process through leaching using sulfuric acid 6 N, 20% solids for 2 hours without heating. The best result was obtained from a 60-hour mechanically, activated leucite in leaching condition and conducted without heating. ... EXTRACTION OF POTASSIUM FROM FELDSPAR AND LEUCITE BY TWO DIFFERENT ...
106 microns, 850 Co, 60 minutes, 1:1.5 feldspar:CaCl2), 99% of the potassium was successfully extracted from the ore feed. Keywords: potassium extraction; feldspar; muscovite; chloridizing roasting 1. Introduction Potassium is the seventh most abundant element in the world and it has a significant function in
The low temperature molten salt method was used to extract potassium from K-feldspar ore, and some related factors including mass ratio between NaNO 3, NaOH, H 2 O and K-feldspar ore, particle size of K-feldspar ore, reaction temperature and time were investigated, respectively. In addition, the optimum condition for this method was determined by a series of …
DOI: 10.1016/J.CJCHE.2017.09.006 Corpus ID: 103780591; The extraction of potassium from K-feldspar ore by low temperature molten salt method @article{Wang2017TheEO, title={The extraction of potassium from K-feldspar ore by low temperature molten salt method}, author={Zhao Wang and Zhang Quanyou and Ying Yao and Yongza and Bin Xie}, …
Bioleaching of potassium from feldspar was optimized for five fungal and two bacterial isolates for carbon, nitrogen, agitation, pH and incubation time. Fungal isolates SDS R and SDS 3 and bacterial isolate SDS 1 released 34, 42 and 28 ppm K in sucrose-amended medium, respectively.
Zhang et al. have extracted more than 80% potassium from roasting feldspar with calcium chloride and calcium carbonate followed by water leaching. 11 Shekhar et al. have reported 98% recovery of potassium from glauconitic sandstone using sulfation roasting followed by water leaching. 12 At 900 °C, the extraction of potassium is about 93% w/w.
Feldspar, a low-alumina, and abundantly available aluminosilicate source, is explored in this study to extract aluminum and potassium values. The sample comprises lamellar layers of microcline and albite with quartz containing 17.4% Al 2 O 3, 9.67% K 2 O, and 66.3% SiO 2.Mechanical (milling) and thermal (alkali and acid baking) activation are investigated, …
The extraction of potassium from K-feldspar by calcium chloride calcination is a heterogeneous reaction. Generally, the factors affecting the extraction involved mainly the calcination temperature, reaction time, mass ratio of the CaCl 2 /K-feldspar ore and particle size of the K-feldspar ore. However, a preliminary experiment indicated that ...
The low temperature molten salt method was used to extract potassium from K-feldspar ore, and some related factors including mass ratio between NaNO3, NaOH, H2O and …
Complete extraction of potassium was achieved by roasting feldspar with eggshell powder and 1.5 times the stoichiometric amount of hydrochloric acid. The optimized conditions were feldspar …
extraction of potassium from leach liquor of ores has not been carried out so far. In the current work, solvent extraction of potassium from liquor generated from water leaching of roasted feldspar has been carried out. Effect of process parameters on extraction was thoroughly studied, and optimum conditions for extraction were determined. 2 ...
