For ultra-fine powder making, the choice of processing equipment is crucial. The selection of ultrafine grinding equipment is mainly related to the physical properties (hardness, density, moisture, feed size, etc.) of the materials to be processed, the amount of treatment, the fineness and particle size distribution of the pulverized product, the purity, the shape of the grains, and the process configuration of the equipment. Relevant, and the equipment selected must meet the requirements for grinding product particle size, design yield or throughput, and adapting to the maximum particle size in the feedstock.
At the same time, it is necessary to compare the production capacity, unit product power consumption, wear, equipment operation stability, automatic control level, maintenance and overhaul performance and process matching performance of various types of ultra-fine grinding equipment under the same conditions.
For the processing of bulk industrial mineral ultrafine powders, such as heavy calcium carbonate, ordinary talc, kaolin, wollastonite, etc., dry superfine grinding equipment should be given priority because the unit value of these industrial mineral powders is relatively high. low. Wet superfine grinding equipment can generally be used for ultra-fine grinding of various hardness materials.
(1) Jet mill
is one of the most important superfine powder grinding equipment, especially when crushing products with fine particle size, high purity requirements and large added value, the finest processed powder products with d97=3～5μm, output From tens of kilograms to several tons per hour, it is widely used in non-metallic minerals such as talc, graphite, wollastonite, zircon, kaolin, barite, and abrasives (silicon carbide, boron nitride, garnet, corundum, etc. ), superfine pulverization processing of chemical raw materials, pigments, medicines and health products, metals and rare earth metals.
(2) Mechanical impact type superfine grinding mill
is a superfine grinding equipment selected by the domestic non-metallic mineral industry. It is widely used in coal-based kaolin, calcite, marble, chalk, talc, pyrophyllite and other medium-hard non-metallic minerals. As well as ultra-fine pulverization processing of chemical raw materials, pesticides, etc., the product fineness can generally reach d97=10μm, the so-called 1250 mesh, with high-performance fine classifier, it can produce ultra-thin powder products with d97=5～7μm. .
(3) Stirring ball mill
has been widely used in the production of kaolin, heavy calcium carbonate, mica, talc, various abrasives, paint pigments, etc., in which the wetness of the product can reach d97=2μm.
(4) Large-scale agitating ball mills
such as ultra-fine grinding machines have been applied in fine grinding or ultra-fine grinding processing of paper pigment grade heavy calcium carbonate, calcined kaolin, and the like.
(5) The product fineness of the wet vibrating ball mill
can reach d97=5μm, and the dry vibrating mill (without classifier) can reach d90=15~20μm, but the particle size distribution range of the crushed product is wide.
(6) The structural characteristics of the rotary barrel ball mill
for ultra-fine pulverization are that the diameter of the mill is relatively large, and the ball or steel segment is used as the grinding medium. The granularity of the abrasive product is generally distributed widely, and often consists of a classifier in production. Closed-circuit crushing operation, this ball mill-classifier dry closed-circuit operation is applied to the production of ultra-fine heavy calcium carbonate. The feed size is ≤5mm, and the product fineness can reach d97=5～45μm.
(7) The grinding and stripping machine
adopts multi-stage series configuration and continuous wet grinding method, and the product fineness can reach about d97=2μm.
(8) The tower mill
uses special natural pebble as the grinding medium for continuous production. The tower dry mill of this type of classification machine has been applied to the production of cement, talc, bentonite, etc. The fineness of the product can reach d97=10μm. .
(9) The sand mill
mainly has two types of horizontal and vertical models. The fineness of the product can reach d97=2μm. The domestic sand mill is mainly used for superfine crushing of pigments, dyes and heavy calcium carbonate and kaolin. And scattered.
(10) Cyclone self-grinding mill
or cyclone pulverizer
is a new type of dry fine grinding and superfine grinding equipment independently developed in China, suitable for limestone, calcite, marble, talc, wollastonite, kaolinite, The crushing of barite, quartz, feldspar and other materials, feed size ≤ 30mm, product fineness can be adjusted between d97 = 40 ~ 10μm (400 ~ 1250 mesh).
(11) High-pressure jet pulverizer
or ultra-fine stripping homogenizer has been applied in the fine pulverization and ultrafine pulverization of mica and kaolin and the dispersion and depolymerization of titanium dioxide pigment, depending on the particle size of the feed, the fine pulverized product The finest degree can reach d97=10~45μm.
In short, the premise of scientific and practical selection of the main process equipment is that at least the type, performance characteristics, application and equipment manufacturers of the ultra-fine grinding equipment have a certain understanding. Under normal circumstances, the mature performance should be selected. Industrial equipment.
MAIN GRINDING EQUIPMENT: