Method for coarse grain separation and dry-type powdering of granite pegmatite

Abstract

The invention provides a method for coarse grain separation and dry-type powdering of granite pegmatite. The preparation method comprises the steps that (1) crude ores of granite pegmatite are crushedand graded, so mineral particles 1 with a particle size of 3mm-20mm and mineral particles 2 with a particle size of -3mm are obtained, the mineral particles 1 are processed with photoelectric sorting, and quartz particle concentrate ores and feldspar particle concentrate ores are obtained; (2) the mineral particles 2 and the feldspar particle concentrate ores are processed by a high-pressure rollgrinding-air classification closed-cycle powdering system, so fine grain materials and a gas material mixture are obtained, feldspar powder 1 is obtained after magnetic sorting and purification of the fine grain materials, the gas material mixture is processed by a powder collector for gas-material separation, and feldspar powder 2 is obtained; and (3) the quartz particle concentrate ores are treated by hammer crushing, screening, magnetic sorting and purification, and a quartz product is obtained finally through screening and grading. The method provided by the invention has the beneficial effects of short processes, the small quantity of devices, a large processing amount, a small particle size of the product and the like; energy consumption cost is reduced; and the method can be applied to industrial and large-scape production.

Description

technical field [0001] The invention relates to the technical field of ore dressing, in particular to a dry-process pulverization method of coarse-grained separation of granite pegmatites. Background technique [0002] The main minerals of granite pegmatite are potassium feldspar and plagioclase, and the paragenetic minerals are mainly quartz and muscovite. The feldspar mineral grains in this type of ore are coarse, pure, fleshy red, dense and massive, k 2 O=10-13wt%, Na 2 O=0.3-1.5wt%, SiO 2 =65-72wt%, Fe 2 o 3 <0.15wt%, white quartz SiO 2 >98.5wt%, Fe 2 o 3 <0.15wt%, distributed in feldspar ore in the form of large particles, such as figure 2 As shown, the overall feldspar content of the ore is low k 2 O+Na 2 O<10wt%, the added value of the product is low. In the mining and crushing of granite pegmatite, a large amount of high-quality feldspar and quartz are mixed together to reduce the quality of the two minerals, such as image 3 As shown, it canno...

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Problems solved by technology

[0005] CN109013057A discloses a method for separating feldspar and quartz from granite rocks. The particle size range of color selection is 0.38mm-8mm. In actual industrial production, the processing capacity of single equipment is small, and the economy is poor, so it is difficult to realize industrialized large-scale production; the steps ( 5) does not specify which method to use for powder making. In the prior art, the method of crushing + ball milling is usually used for powder making. The process is long and consumes a lot of energy. In addition, steel balls are usually used for ball milling, which is easy to cause damage to materials. Fe 2 o 3 Secondary pollution, resulting in unqualified products

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