| The feldspar resource in our country is very rich, but most of which don't use directly due to its low quality. With exploiting and using of much high quality feldspar resource, the high resource is more and more poor, then lots of low quality is awaited to developed.The technical research on ore-flotation purification is the key to improve the use ratio of feldspar resource, and the quality of feldspar product.This ore deposit in Shandong belong to pegmatite deposit, which reserve is large, easy to exploit,but the impurity mineral is relatively much, so the difficuty to separation is rather hard.This ore contain a quatity of calcite and mica,which must be got rid by flotation.According to feature of this feldspar, it is researched syetemetically by a series of experiments:ore-griding, desliming, magenatic separation, calcite re-flotation and mica re-flotation.(1) As to this feldspar ore, the major mineral are albite, potash feldspar and perthite. The major gangue mineral contains quartz, mica, calcite and a lillte hematite, limonite, rutile and zircon.This ore contains albite49%, potash feldsparl6%, perthite4.5%, quartz17%, mica9.5%, calcite3%, hematite and limonitel%,other ore <0.5%.The element of iron basically is contained in biotite, hematite and limonite,titanium is contained in rutile and autunite basically is contained in calcite.(2) Compared with three means of grinding, the paper comfirmed that grinding ore by steel ball media is highest in efficiency, and the iron from steel ball grinding process can effectively get rid of by process "desliming-magenatic separation"(3) According to the experiment of grinding fineness, this paper comfirmed the available grinding fineness is-0.074mm63.68%.(4) By investigating the distribution of iron and autunite, the paper learned that Fe2O3 and CaO are distributed in small fraction of -0.030mm, and then demonstrated that desliming to the fineness of -0.030mm can effectively get rid of iron-mineral, titanium- mineral and iron from grinding process.and finally comfirmed the desliming fineness is -0.030mm. (5) According to 3 groups experiments, this paper comfirmed the best available conditions for magenatic separation are that magnetic field intensity is 0.9T, the flow rate of ore slurry is 0.8cm/s.the impulse of magnetic separator is 300 every minute.(6) According to 4 groups experiments of calcite re-flotation,this paper comfirmed the best medicament conditions for calcite re-flotation are that the dosage of pH modifier Na2CO3 is 600g/t,the dosage of collector C is 1500g/t.(7) According to 3 groups experiments of mica re-flotation, this paper comfirmed the best medicament conditions for mica re-flotation are that the dosage of pH modifier H2SO4 is 2000g/t, the dosage of collector (collector A+ hydrocarbon oil A) is 160g/t.(8) By a series of experiments, this paper comfirmed the best technological process to purify this feldspar, the process is "grinding-desliming-magenatic separation-calcite re-flotation-mica re-flotation",by which the final concentrate can be obtained which the content of total iron is 0.12%,calcium oxide was 0.26% and the sum Na2O and K2O is 11.05%.This final concentrate reached the first quality standard of feldspar for glaze, white blank of porcelain and plate glass.(9) By analyzing the mechanism between minerals and collectors, the paper verified that the absorption between collector C and calcite may be chemisoption in the alkalescent condition (pH=8), and in the acid condition (pH=3.5), the collector A absorbed on the surface of mica is depend on electronstatic force,which is physisoption.
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