Perlite is a non-renewable resource. Because of its low density and relatively low price, many commercial applications for perlite have developed.
In the construction and manufacturing fields, it is used in lightweight plasters and mortars, insulation and ceiling tiles. In horticulture, perlite can be used as a soil amendment or alone as a medium for hydroponics or for starting cuttings. Perlite is an excellent filter aid. It is used extensively as an alternative to diatomaceous earth. The popularity of perlite usage in this application is growing considerably worldwide. Perlite filters are fairly commonplace in filtering beer before it is bottled. Small quantities of perlite are also used in foundries, cryogenic insulation, as a lightweight aggregate in mortar (firestop) and in ceramics as a clay additive. It is also used by the explosive industry.
Perlite powder processing equipments:
>> Jaw crusher: output fineness 10-105mm, capacity 90t/h
>> Hammer crusher: output fineness smaller than 25mm, capacity 45t/h
>> Box-type crusher: input fineness 600-800mm, output fineness smaller than 50mm, capacity 160t/h
>> European coarse powder mill: output size below 3mm, capacity 100t/h
>> YGM high pressure suspension Raymond mill: output size between 15-200meshes
>> HGM three-ring vertical roller mill: output size between 200-3000meshes (can be adjusted)
HGM series three-ring medium speed vertical roller mill is designed and manufactured by shanghai clirik machinery,  is the new type grinding equipment specializing in producing fine and superfine powder of non-inflammable, non-explosive and brittle materials with Mohs’ hardness under six, such as calcite, chalk, limestone, dolomite, kaolin, bentonite, talc, mica, magnesite, illite, pyrophyllite and vermiculite, sepiolite, attapulgite, rectorite, diatomite, barite, gypsum, alunite, graphite, fluorite, rock phosphate, kalium ore, pumice, etc., totally more than 100 kinds of materials.
Working principle of HGM vertical roller mill:
HGM vertical roller mill mainly consists of main unit, classifier, powder collector, dust cleaner, blower, muffler, sound-proof room, crusher, bucket elevator, storage hopper, and vibrating feeder.
After crushed by hammer crusher, the large materials become small ones and are sent to storage hopper by elevator, edge of then evenly sent to the upper distribution plate of the turnplate by vibrating feeder and sloping feeding pipe. When the grinding mill is at work, all the grinding rollers are rolling in the ring, and the materials are driven to the edge of the turnplate by the centrifugal force and fall down into the grinding chambers where the materials are repeatedly pressed, crushed and grinded by the rollers. The high-pressure air blower constantly inhales air within the grinding mill and, in turn, the air flow with crushed materials are brought to the classifier whose high-speed impeller will screen the airflow: the unqualified particle size will fall and return to the mill for being reground while the qualified particle size mixed with air will go into the cyclone powder collector. Most of the qualified powders will fall an exit from the discharging valve at the bottom; a small proportion of the fine powders, with airflow, moves to the dust cleaner, and clings to the surface of the filter bags. At the same time, the fine powders clinging to the surface fall down by the sudden vibration of the filter bags, which is caused by the instantly ejected high-pressure gas controlled by the pulse valve. The materials from the above two lots are sent by the conveyor at the bottom to get finished powders packed. In addition, filtered clean air will be emitted from the air outlet of muffler in the end.
Features of HGM vertical roller mill:
1. High efficiency
Under the same finished final size and the same motor power, the capacity of vertical roller mill is twice as much as jet mill, mixing grinder and ball mill.
2. Long life cycle of spare parts
The ring and roller are forged by special material with high utilization. Under the same grinding material and finish special size, the lifecycle of spare parts is about one year, which is 2-3times longer than impact mill or turbo mill. Furthermore, the lifetime can reach 2-5 years for grinding calcite carbonate.
3. High safety and reliability
As no rolling bearings or screws in grinding cavity, there are no problems caused by bolts shedding or rapid wear of bearings and seal components.
4. High fineness and flexible adjustment
The final fineness of the grinding materials can be adjusted between 325 meshes and 3000 meshes, and the product fineness can reach D97≤5um.
5. Environment-friendly
The application of pulse deduster and muffler greatly alleviates dust pollution and noise.
Model and technical data of HGM vertical roller mill:

Model	HGM80	HGM90	HGM100	HGM100A	HGM125
Ring Diameter(mm)	800	900	1000	1000	1250
Ring Number/pcs	3	3-4	3-4	4	4
Roller Number/pcs	21	24-32	27-36	27-36	40-44
Main Shaft Speed/r. p. min	230-240	200-220	180-200	180-200	135-155
Input Size/mm	≤15
Finished Size/um	5-47(325-3000)
Capacity t/h	0.4-4.5	0.4-5.5	0.4-6.5	0.4-7.5	0.7-10
Outlet Size L*W*H/m	13.9*4*6.2	14.7*4.8*7.2	18*4.6*8.6	18*4.6*8.6	14*9*10.25

Note: This specification is just referencing, any changes are subject to the products.
Should you have any questions, please do not hesitate to contact me.
Phone: 0086-21-20236178
Contact person: Cherry. Zhao
E-mail: clirik_grinder@163.com; cherry201201@hotmail.com
Website: http://www.vertical-mill.net