Potassium Feldspar （K – f eldspar）is one of the most common aluminosilicate minerals in the EarthIs crust, with the chemical formula KAlSi3O8 Orthoclase/ M icrocline. It is the most potassium-rich member of the feldspar group, belonging to the framework silicate structure, and is widely found in acidic rocks such as granite, syenite, and pegmatite.
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info@lsakminerals.comStandard Process: Raw Material → Manual Sorting → Crushing → Grinding → Classification → Dewatering → Finished Product This process is suitable for raw materials with low iron content and high quality. A jaw crusher is used for coarse and fine crushing. To prevent iron contamination during processing, grinding equipment such as wheel mills, pebble mills, ceramic ball mills, or ultra-fine laminated autogenous mills are preferred. A spiral classifier is used to ensure the product particle size. This process is simple and requires low investment, but its drawback is that the iron content of the final product may struggle to meet the requirements for high-quality ceramic products.
Enhanced Process with Iron Removal: To overcome the limitations of the standard process, a magnetic separation stage is added. Practice has proven that using a Wet High-Gradient Magnetic Separator WH GM S is highly effective for iron removal, achieving an iron removal efficiency of 70%-90%
1. Natural Flux: Rich in K2O （12.77%）and K2O（15.38%） it significantly reduces firing/melting temperatures, saving energy and improving production efficiency.
2. Performance Enhancer: Providescritical Al2O3, which greatly enhances the final productIs mechanical strength, hardness, and chemical stability.
3. High-Efficiency Whitening Agent: Premium potash feldspar features extremely low iron content, ensuring high whiteness and light transmittance in ceramics and glass—delivering exceptional whitening performance.
| Chemical Analysis | |||||||||
| Product Code | SiO2 | Al2O3 | Fe2O3 | TiO2 | CaO | MgO | Na2O | K2O | L.O.I. |
| % | % | % | % | % | % | % | % | % | |
| LSAK Nepheline | 61.37 | 21.24 | 0.05 | 0.01 | 0.42 | 0.04 | 8.28 | 5.59 | 2.72 |
• Promoting Vitrification and Densification: The molten potassium feldspar glass phase fills pores in the body, increasing the ceramicIs mechanical strength, density, and translucency.
• Adjusting the Firing Range: The melting range of potassium feldspar is relatively narrow, which helps in precisely controlling the firing process and reducing product deformation.
• Main Component in Glazes: In glazes, potassium feldspar provides the combined effects of fluxing, whitening, and imparting gloss. It is the primary flux material, supplying K2O to lower the glazeIs melting temperature and improve the glaze surfaceIs gloss, smoothness, and chemical stability.
• Introducing Potassium Oxide K 2O: K2O is an important network modifier oxide in glass, significantly lowering the glassIs melting temperature and viscosity, improving melt performance, and enhancing product stability.
• Improving Glass Properties: Compared to soda feldspar, potassium feldspar imparts superior properties to glass, such as: Higher Gloss and Transparency: Potassium ions reduce the dispersion in glass, making it clearer and brighter.
• Better Chemical Stability and Thermal Shock Resistance: Potassium-bearing glass typically has stronger resistance to chemical corrosion and a lower coefficient of thermal .
• Application Fields: Mainly used for manufacturing glass with high requirements for optical properties and chemical stability, such as high-end tableware, optical glass, TV CRT glass, and specialty glass fibers.
• Potash feldspar is a natural carrier of potassium feldspar . Although its potassium content is not high and it is insoluble in water makingitunsuitablef or directuseasa potash fertilize, its potassium can be converted into soluble potassium salts e. g. , potassium chloride, potassium sulf ate through specific processes likehigh − temperaturecalcination withchlorides , or acid/ alkalileaching for potash fertilizer production.
• Filler: Ground potassium feldspar powder can be used as a filler in paints, coatings, rubber, and plastics to improve product performance and reduce costs.
• Abrasives: Due to its moderate hardness, it can be used as a medium-hardness abrasive.
• Plastics: To increase hardness.
• Enamel: As a glaze skeleton and to improve adhesion.
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