Laboratory Mills

Content
1. What are laboratory mills?
2. Types of laboratory mills
    2.1 Laboratory ball mill
    2.2 laboratory hammer mill
    2.3 Laboratory roller mill
    2.4 Laboratory rod mill
    2.5 Rubber lab mill
    2.6 Laboratory jet mill
    2.7 Laboratory jar mill
    2.8 Laboratory disc mill
    2.9 Lab basket mill
3. How to buy laboratory mills?

Laboratory mills, also known as laboratory sample grinders, laboratory cutting mills, and laboratory bead mills, are a kind of equipment with a strong pulverizing ability by grinding solid particles into ultra-fine powder through the relative rotation of the mortar (ceramic or agate) and the grinding rod. Because of the convenience of setting time, automatic grinding, and replacing manual grinding, this type of laboratory equipment can be widely used in pharmaceutical, electronic, food, chemical, metallurgical and other industries as well as universities and research institutes.

The laboratory grinding mill is a unit operation designed to break a solid material into smaller pieces, such as diamond wheel abrasive micronized powder, electronic micronized powder (e.g. semiconductor micronized powder, polysilicon micronized powder), resin micronized powder, food micronized powder (e.g. coffee powder), pharmaceutical micronized powder, chemical micronized powder (e.g. iodine micronized powder), etc. The grinding of solid matters occurs under exposure to mechanical forces that trench the structure by overcoming the interior bonding forces. This operation changes the grain size, grain shape, and grain size disposition of the solid matter.

A lab ball mill is a key piece of equipment for secondary grinding after materials have been crushed. This type of mill is loaded with a certain number of steel balls as grinding media in its cylinder.

A ball mill is widely used in the production of cement, silicate products, new construction materials, refractory materials, chemical fertilizers, black and non-ferrous metal beneficiation, and glass-ceramics. It can be used for dry or wet grinding of various ores and other grindable materials. A lab scale ball mill is a laboratory sample pre-treatment instrument.

Several advantages of the ball mill grinder laboratory:
1) The low cost of installation and grinding medium.

2) Adjustable capacity and fineness by adjusting the diameter of the ball.

3) Suitable for both batch and continuous operations.

4) Suitable for open and closed-circuit grinding.

5) Applied in materials of all degrees of hardness.

A planetary ball mill is a necessary device for mixing, fine grinding, small sample preparation, nano-materials dispersion, new product development, and small batch production of high-tech materials. The planetary ball mill for laboratory is smaller than common ball mills and mainly used in laboratories for grinding sample material down to very small sizes. It consists of at least one grinding jar which is arranged eccentrically on a sun wheel. The moving direction of the sun wheel is opposite to that of the grinding jars. The grinding balls in the grinding jars are subjected to superimposed rotational movements, which are called Coriolis forces. The difference in velocity between the balls and grinding jars creates an interaction between frictional and impact forces, which releases high dynamic energies. The product is small in size, full-featured and high in efficiency. It is the ideal equipment for scientific research units, colleges and universities, and enterprise laboratories to obtain micro-particle research specimens, and with the vacuum ball mill jar, the specimens can be ground under a vacuum.

Lab hammer mills are similar to the hammer crushers used in industry. The main purpose of a hammer crusher is to turn solid materials into small pieces of materials under the action of mechanical force. Therefore, it is widely used in metallurgy, coal carbon, construction engineering, and feed processing sectors.

Due to centrifugal force, the hammer becomes radial when the rotor of the hammer mill rotates at high speed (for rotors with suspended hammers). The rubber material enters the machine after being rolled by the feeding roller and is immediately crushed into particles by the impulse and tearing effect of the hammers. The granular rubber is discharged from the discharge sieve at the bottom of the machine, and if the more human rubber block cannot pass the sieve is left to be impacted by the hammers again until it passes the sieve. The hammer mill does not rely on all the energy of the rotor parts to crush the rubber, but mainly on the work done by the kinetic energy of the hammer to complete the crushing of the rubber.

a. Weight, shape, and material of the hammer

b. Rotational speed of the rotor

c. The opening ratio of the discharge sieve

d. Pre-treatment methods for different nature of gels and agglomerates

The lab roller mill is also called lab two roll mill or laboratory two roll mill. Under the rotation of two rolls in opposite directions, the material enters the middle of the rolls tangentially, and the gap is reduced with the rotation of the rolls. The grinding roller gap can be adjusted from 0mm to 20mm according to the requirements of the crushing size to obtain the corresponding size. Basic structure: It is mainly composed of a fixed roller, movable roller, transmission shaft, body, bottom frame, cover shell, long gear cover shell, and so on.

The laboratory roller mill is mainly used for medium and fine crushing of raw materials, like the crushing coal, coal gangue, coke, limestone, sulfur ore, phosphate ore, etc. The machine is designed with reasonable structure, easy maintenance, and simple operation. It is widely used in sampling and testing in coal, coking, mining, metal smelting, and other industries.

Rod mill is commonly used in the coal chemical industry such as quartz sand, silica sand, sand plus gas, tungsten ore, potassium sodium feldspar, bauxite, ore, and coal water slurry preparation, etc. Rod mill steel rods are grinding media rods used in all kinds of rod mills. The laboratory rod mill is popular in the market for its advantages of energy-saving, high efficiency, easy adjustment, uniform crushing, and no grinding. Like the ball mill, it needs to have a high hardness and impact value to ensure better wear resistance and a lower rod breakage rate.

The main body of the lab rod mill is a low-speed rotary cylinder mounted horizontally on two large bearings, which allow it to drive slewing. It is driven by an electric motor through a reducer and a peripheral large gear, or by a low-speed synchronous motor directly through a peripheral large gear. The cylinder is equipped with steel rods as grinding media, which are lifted to a certain height by centrifugal force and friction, and fall in a throwing or draining state. The material to be ground enters the barrel continuously through the feeding port and is crushed by the moving grinding media.

The lab rubber mixing mill is composed of a crushing mainframe, motor frame, water cooling, and other systems. Its basic principle is to achieve the purpose of material crushing by shearing and grinding the material through the relative movement of two grinding discs. It adopts double water cooling to effectively control the temperature of material crushing, to get the ideal product quality.

The jet mill has the advantages of a wide range of applications and the high fineness of finished products. It can make the machine become inert gas protection equipment by changing the ordinary air in the gas source part to nitrogen, carbon dioxide gas, and other inert gases, which is suitable for the crushing and grading processing of flammable and explosive, easy to oxidize, and other materials. It can grind materials such as super hard diamond, silicon carbide, metal powder, ceramic color, medicine, biochemical, pharmaceutical, PVC, etc.

The lab jet mill usually constitutes a crushing system together with a cyclone separator, dust collector, and induced draft fan. After filtering and drying, the compressed air is injected into the crushing chamber at high speed through the Laval nozzle. At the intersection of multiple high-pressure airflows, the material is repeatedly crushed by collision, abrasion, and shear. The crushed material moves to the grading area with the upward airflow under the action of fan pumping force. Under the action of strong centrifugal force generated by the high-speed rotating classifying turbine, the coarse and fine materials are separated. Fine particles that meet the particle size requirements enter the cyclone separator and dust collector through the grading wheel, and coarse particles fall to the crushing area for further crushing.

The laboratory jar mill is ultra-fine grinding and mixing equipment for laboratory and small batch production. The equipment is beautiful and novel, compact in structure, easy to operate, high efficiency, and uniform grinding size, is the preferred equipment for scientific research, teaching, testing, and production. It can be widely used in electronic materials, magnetic materials, biological medicine, ceramic glaze, non-metallic ore, new materials, and other industries. The tank of the machine is moved by the rubber roller to have the best rotation, which can make the media ball in the grinding tank form a tilting flow movement to disperse the material, and get the best grinding effect, which can grind the material to the micron level faster.

A laboratory disc mill is a type of crusher that can be used to grind, cut, crack, shear, curl, shred, fiberize, fluff, pulverize, granulate, rub, hull, blend, twist, or refine. Its working principle is that the feedstock is fed between opposing discs or plates. The discs may be spiked, grooved, or serrated. There are single-disc mills, double-disc mills, and multiple-disc mills for different applications. The single-disk mill is only used for high consistency pulping, while the multi-disk mill has a refined grinding disk form for low consistency pulping and post-treatment of mechanical pulp.

The lab basket mill is a common equipment for small test experiments and scientific research. It is suitable for wet grinding of low and medium viscosity materials. It integrates dispersion and grinding with one machine, featuring multi-purpose, simple operation, easy cleaning, less material residue, and high production efficiency. It is widely used in coating, pesticide, pigment, color paste, functional ceramics, cosmetics, medicine, photovoltaic materials, and other industries.

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