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Abstract
Feldspar minerals are essential ingredients for the glass and ceramic-glass industries. The potassium element found in certain proportions in the composition of K-feldspar minerals has a fundamental function in the growth of plants. The production of potassium fertilizers is mostly made from the soluble minerals, which are located in lakes. Despite having a huge area of use in the agriculture industry, the reserves of these salts are limited and not evenly distributed in the earth’s crust. Due to the high availability of feldspar reserves in the earth’s crust, the production of potential potassium salts can provide a wide range of social and economic benefits. 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 performed on the sample by adapting various solvents. To emphasize the importance of roasting before the dissolution process, different parameters such as particle size, roasting temperature, and duration, as well as the feldspar/CaCl2 ratio, were tested. Under the optimum conditions (i.e., −106 microns, 850 Co, 60 minutes, 1:1.5 feldspar:CaCl2), 99% of the potassium was successfully extracted from the ore feed.
Highlights
Potassium is the seventh most abundant element in the world and it has a significant function in the growth of plants with nitrogen and phosphorus [1]
Potassium, which is a key component in the agriculture and ceramic-glass industries, is expected to be produced at a global volume of nearly 43 million tons in 2019 [15]
In the scope of this study, K-feldspar was used as an alternative source and a series of experiments were performed to extract potassium in an efficient way
Summary
Potassium is the seventh most abundant element in the world and it has a significant function in the growth of plants with nitrogen and phosphorus [1]. The first one is potassium chloride (KCl), and the known minerals of this compound are sylvite (KCl) and carnallite (KMgCl3 ·6(H2 O)). The second source is potassium sulphate (K2 SO4 ), and it is mostly found as kainite (MgSO4 ·KCl·3(H2 O)) and leonite (K2 Mg(SO4 )2 ·4(H2 O)). All of those minerals are mostly found in salt lake deposits. For some specific fruits and vegetables, potassium sulphate can only be used due to their sensitivity to chloride. Potassium sulphate is not as commonly used as potassium chloride. Potassium sulphate is mostly produced from potassium chloride by reacting it with sulphuric acid
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