Study On Removing Iron And Mica From Potash And Soda Feldspar

Feldspar is one of the main raw materials in ceramic production. In recent20years, with the fast development of ceramic industry in China, the output ofarchitectural pottery and daily ceramics occupies the first place in the world. However,excessive consumption of premium feldspar makes our country face the crises offeldspar resources. The only feasible way to solve the problem is to optimize the lowquality of feldspar. The iron and mica is the major impurity of low feldspar, affectingthe whiteness, dielectric properties, chemical stability, etc. Removing the iron andmica in feldspar needs to be resolved urgently.According to the above problem, the potassium sodium feldspar was studied in aceramic material co., LTD in Yunan county, Yunfu city, Guangdong province. Themineral processing reagent and mineral processing technology were studied andoptimized, including the following aspects:1. The SEM, XRD and other analytical instruments were used to analyse andresearch the structural characteristics of feldspar. The test results show that Fe2O3>0.90%, K2O+Na2O<10%, the whiteness of ore is7%, so it belongs to low quality ore.2. In laboratory experiments，petroleum sulfonate, sodium oleate and petroleumsulfonate and sodium oleate complex was studied to remove iron, etroleum sulfonateand sodium oleate complex was optimal reagent and the optimum mass ratio was2:1.12amine,18amine and12amine and18amine complex was studied to remove themica,12amine and18amine complex was optimal reagent and the optimum massratio was2:1. The concentration and amount of reagent, pH, mixing time, flotationtime, and pulp density were studied. The optimal experiment scheme was removaliron reagent concentration5%, join quantity2g/L, pH=5~6, the mixing time1min,flotation time5min, pulp concentration50%;removal mica reagent concentration5%,join quantity0.5g/L, pH=2~3, the mixing time1min, flotation time5min, pulpdensity40%. According to this process, the whiteness of the feldspar obtained was59%, Fe2O3<0.20%, K2O+Na2O>12%，which belongs to high quality ceramic rawmaterials.3. The process flow of “undressed ore—crushing—grinding—sieving—magnetic separation—separation flotation—magnetic separation—dehydration” wasadopted in the semi-industrial test. The factors such as grinding methods, grindinggranularity, magnetic separation conditions, as well as the dosage of the flotationreagent were studied. The optimal experiment scheme was steel ball grinding,grinding particle size60mesh (0.25mm), magnetic field intensity0.9T, slurry flow velocity2.0cm/s, pulsation frequency300times/min. The whiteness of the feldsparobtained was61%, Fe2O3<0.12%, K2O+Na2O>13%.4. The process flow of “raw ore—crushing—grinding—sieving—magneticseparation—separation flotation-dehydration” was adopted in the industrialexperiment. The whiteness of the feldspar obtained was65%, Fe2O3<0.10%,K2O+Na2O>14%, which meets standard of feldspar special product (QB/T1636-1992).Removing iron and mica in feldspar has been carried on in this paper and thesynergism of the flotation reagent was explored in this paper. In order to apply inactual production, the factors such as the flotation reagent concentration, join quantity,pH value, pulp density, the order to remove impurity, grinding method and magneticseparation conditions were discussed to determine the flotation reagent formula,experimental scheme and process flow. The process has been trial production for ayear, the product obtained have high whiteness and good quality. This paper describesa new method to optimize low quality feldspar into high quality feldspar for ourcountry.