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Vermiculite Grinding Mill and Grinding Process

Date:2023-07-28 13:43:40    From:    Click:

About Vermicalite

Vermiculite, also known as roseite. Vermiculite is a naturally occurring, inorganic, non-toxic mineral that expands at elevated temperatures. It is a relatively rare mineral, belonging to the silicate group. Its crystal structure is a monoclinic crystal system, and its appearance is similar to that of mica. Vermiculite is produced by the hydration of certain types of granite, and is normally produced at the same time as asbestos.


The term "vermiculite" is derived from the Latin words for "worm-like" and "trace". When rapidly heated to 200-300°C, vermiculite produces worm-like flakes along its crystal's C-axis, which explains its name. Vermiculite is a layered structure of magnesium-containing hydroaluminosilicate secondary metamorphic minerals that originally resembled mica. It typically forms through hydrothermal alteration or weathering of black (gold) mica. It curves and resembles a leech in shape due to the expansion of heat loss, hence its name. Vermiculite shares similarities with montmorillonite, a layered silicate clay mineral that can appear as coarse biotite or fine soil after undergoing hydrothermal processes or weathering. Upon heating to 300°C, vermiculite can expand up to 20 times and bend like a leech. It usually has an oil-like sheen and comes in brown, yellow, and dark green colors, turning gray when heated. Vermiculite has found use as a building material, as an adsorbent, as a fireproofing material, as a mechanical lubricant, or as a soil amendment.

Application of Vermiculite in Various Fields


Construction Industry

After undergoing elevated temperature treatment, vermiculite undergoes a transformation into expanded vermiculite. This material possesses the advantages of lightweight, thermal insulation, heat preservation, and moisture resistance, making it extensively utilized within the construction industry. For instance, it can be applied as an insulating layer on rooftops or combined with insulating adhesive to create insulation boards. Additionally, it finds application as partition panels and fireproof boards in high-rise buildings.



Vermiculite is a valuable soil amendment in agriculture due to its excellent cation exchange and adsorption properties, which enhance soil structure, water storage and retention, permeability, and pH balance. It also acts as a buffer to slow the release of fertilizers into the crop growth media while providing essential nutrients such as K, Mg, Ca, Fe, Mn, Cu and Zn. The unique combination of water absorption capability with cation exchange ability and chemical composition makes vermiculite an effective tool for fertilizer preservation and mineralization. In fact, adding 0.5-1% expanded vermiculite to compound fertilizer has been shown to increase crop yields by 15-20%.



Vermiculite is a versatile material in horticulture and can be used for a variety of purposes such as flower, vegetable and fruit culture, seedling production and soil-free growing. It serves not only as a potting medium and conditioner, but also as an excellent substrate for potting trees and commercial seedbeds during plant transplantation and transport. By providing a long-lasting water supply, nutrients, and maintaining optimal root zone temperatures, vermiculite effectively enhances root growth and ensures stable seedling development. Its application in the early stages of crop growth promotes faster plant growth, resulting in increased yields.

Application of Vermiculite With Different Fineness

In the 20 mesh category are insulation for houses, household refrigerators, automobile mufflers, soundproofing plaster, safe and cellar lining pipes, boiler thermal clothing, ironwork ladles, and firebrick insulation cement.
In the 20-40 mesh category are automotive insulation, aircraft insulation, cold storage insulation, bus insulation, wall panel water cooling tower products such as fire extinguishers and filters.
In the 40-120 mesh category are linoleum flooring materials and roof panels.
In the 120-270 mesh category are wallpaper prints and outdoor advertising materials, as well as paint viscosity enhancers and corkboard fireproof card paper.


Grinding Mill Recommendation

The processing of vermiculite does not require the use of excessively fine grinding mills. Typically, vermiculite can be processed in the range of 20 - 300 mesh. Clirik recommends the use of a Jaw crusher and a Raymond mill, as they are fully compliant with the standards for milling vermiculite, while remaining cost-effective and thus reducing expenses.

PEX Jaw Crusher
Capacity:1-90 t/h
Max Feeding Size:250 mm
The PEX Jaw crusher line boasts a high crushing ratio, uniform product size, simple construction, reliable operation, easy maintenance and cost effectiveness. It finds a wide range of applications in stone mining, the metallurgical industry, the building materials sector, highway and railway construction projects, water conservation initiatives, and the chemical industry. This versatile device is capable of crushing a variety of materials with a compression resistance of up to 320MPa.


YGM Raymond Mill
Capacity:1-50 t/h
Max Feeding Size:35 mm
The YGM Raymond mill is suitable for processing a variety of non-flammable and explosive mineral materials with Mohs hardness less than 9.3 and humidity less than 6%. It finds a wide range of applications in metallurgy, construction, chemical industry, mining, highway construction and other fields. The grain size of the finishing powder can be adjusted in the range of 50 to 325 mesh. This versatile mill can process not only vermiculite, but quartz, feldspar, barite, calcite, carbonate, limestone, talc, ceramics, iron ore, silicon carbide, bauxite, phosphate rock coal, and approximately 1,000 other materials.

Grinding Process

Stage 1: The crushing of the ingredients. The bulk vermiculite material is pulverized by a pulverizer to a point where the feed is fine enough to be fed into the mill.
Stage 2: Grinding Small pieces of the broken vermiculite material are carried by elevator to a storage hopper and are then uniformly quantified by a feeder into the mill's milling chamber for milling.
Stage 3: Grading Ground material is graded by a classification system, and substandard powder is graded by a classifier and returned to the host machine for re-grinding.
Stage 4: Collection of the finished product The powder conforming to the fineness enters the dust collector through the air flow through the pipeline for separation and collection, and the collected finished powder is sent to the finished product silo through the discharge port by the conveying device, and then the powder filling tank truck or automatic baler is used for packaging. 

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