Pumice stone and floatstone ultra-fine grinding mill

HGM series ultra-fine grinding mill is a new type machine to grind Pumice stone into super thin Powder. The final Powder size can be from 5micron to 47micron as per 97% passing rate.

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Pumice is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals. It is typically light colored.
Pumice is widely used to make lightweight concrete or insulative low-density cinder blocks. When used as an additive for cement, a fine-grained version of pumice called pozzolan is mixed with lime to form a light-weight, smooth, plaster-like concrete. It is also used as an abrasive, especially in polishes, pencil erasers, cosmetic exfoliates, and the production of stone-washed jeans. Finely ground pumice is added to some toothpastes and heavy-duty hand cleaners as a mild abrasive. Pumice is also used as a growing substrate for growing horticultural crops. Some brands of chinchilla dust bath are made of powdered pumice.

So, how to make powdered pumice? The grinding mills are necessary.
HGM series ultra-fine grinding mill is a new type machine to grind Pumice stone into super thin Powder. The final Powder size can be from 5micron to 47micron as per 97% passing rate.

HGM series ultra-fine grinding mill is mainly applied to non-inflammable, non-explosive and brittle materials with Mohs hardness scale under seven, such as calcite, chalk, limestone, dolomite, carbon black, bentonite, kaolin, talc, mica, magnesite, illite, pyrophyllite , roseite, sea-foam, attapulgite , rectorite, diatomite, barite, gypsum, alunite, graphite, fluorite, rock phosphate, kalium ore, pumice etc. totally more than 100 kinds of materials.
Finished powder products are in the 325meshs -3000meshs, and yield can be up to 0.5-12 tons per hour. There are five types of Shanghai CLIRIK HGM series ultra-fine grinding mills, they are HGM80, HGM90, HGM100, HGM100A and HGM125.

Features of HGM series ultra-fine grinding mill:
1. High efficiency
Under the same finished final size and the same motor power, the capacity of ultra-fine grinding 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.

Working principle of HGM series ultra-fine grinding mill:
After crushed by hammer crusher, the large Pumice stone 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.

Model and technical data of HGM series ultra-fine grinding mill:

Parameters of HGM Series Ultrafine Grinding Mill
Model	HGM80	HGM80A	HGM90L	HGM100L-Ⅱ	HGM100P	HGM125L	HGM1680L
Ring Diameter(mm)	800	800	900	1000	1000	1250	1680
Ring Number (PCS)	3	3	4	4	4	4	4
Input Size (mm)	≤10	≤10	≤10	≤15	≤15	≤20	≤20
Output Size (mesh)	150-3000	150-3000	150-3000	150-3000	150-3000	150-3000	150-3000
Capacity (t/h)	0.5-5.5	0.5-5.5	0.8-6.5	1.2-10	1.2-11	2.5-20	5-45
*Outlet Size LWH (mm)*	860541396050	1045433936626	1173539527525	1450736337562	1436242007562	1926144068591	2506754149007
Main Motor Power (kw)	75	75	55*2	132/75*2	132/75*2	185	315

Note: This specification is just referencing, any changes are subject to the products.
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