In the laboratory, solid samples generally need to be advanced pre-treatment, and then can be tested, analysis and other operations, and in the pre-treatment step, grinding is a particularly important part, if the grinding is not thorough, the subsequent experimental data is not accurate.
Laboratory commonly used all kinds of sample grinder to grind solid samples, such as knife grinder, disc grinder, mortar grinder, ball mill, etc., each grinding equipment has its advantages and disadvantages, suitable for different samples, the following Oriental Tianjing to introduce the laboratory these commonly used sample grinder.
Laboratory commonly used sample shredder introduction
First, knife grinder
The knife grinder uses a high-speed rotating blade to cut and crush the sample, just like the soy milk machine used in the family, which has a better crushing effect on food and tissue samples. Knife grinder grinding speed, high efficiency, but the sample discharge particle size is relatively poor, better equipment can only grind to 100 microns, suitable for the sample particle size requirements are not strict and meticulous experiment.
Second, mortar grinding instrument
The mortar grinder is a device made according to the shape of the mortar and pestle, and its work is also to imitate the manual grinding of the mortar, using extrusion pressure and friction to grind the sample. This grinding method has a small particle size, and the uniformity can also be, but only one sample can be processed each time, and the sample amount of a single grinding is also small, and if some samples such as ground soil can not be contaminated by secondary pollution, you need to replace the whole set of grinding equipment, the cost is quite high.
Three, disc grinding instrument
Disk grinding instrument has two kinds of conventional type and vibration type, which is the use of the horizontal rotation of the grinding disc and the relative movement of the grinding parts inside the instrument, the use of extrusion pressure and friction to crush the sample, can deal with ore, glass, slag, concrete, ceramics, coal and other samples. However, most disc grinding instruments can only have one sample at a time, the noise is larger during work, and the long-term use of parts is easy to loosen, which is easy to cause dust pollution in the laboratory.
Four, ball mill
The ball mill is to use the impact, extrusion and friction of the grinding ball in the ball mill tank to achieve the fine grinding of the sample, the common planetary ball mill and vibration ball mill. The planetary ball mill uses the rotation of the ball mill tank to give the grinding ball kinetic energy in the tank, so as to grind the sample. The vibrating ball mill is driven by the mechanical structure of the equipment to drive the ball mill tank, give the grinding ball kinetic energy, and realize the grinding of the sample, which can be divided into two-dimensional vibration and three-dimensional vibration.
There are many advantages of the ball mill, such as large grinding energy, small sample discharge particle size, and some samples can reach nanometer level; There are many kinds of samples that can be ground, which can be used for soft, medium hard, hard, brittle, granular, powder and other materials. Strong adaptability, can change the grinding kit of different materials according to the sample type; The ball mill tank has good sealing, no dust pollution, the belt driven ball mill has low noise and good operating environment......
Of course, the ball mill also has certain disadvantages, because each sample needs to configure the proportion of grinding balls, the size is not consistent, need to be explored; The cleaning of the grinding tank and the grinding ball is also a headache; In addition, the ball mill tank of the ball mill will generate heat because of the impact and friction of the grinding ball, and some heat-sensitive samples are not suitable, but this problem has been solved, if you need to control the grinding temperature, you can use a temperature-controlled ball mill.
The above is to share with you a few samples commonly used in the laboratory, we need to choose according to the specific samples to be ground in the laboratory and grinding requirements, no grinder can be applied to all types of samples.
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