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1、  Chemical principles

Beads will wear during the operation,so the beads should be chosen according to the chemical composition of the beads and the loss amount. As well, the chemical elements in the beads are the key factor should be considered, such as the beads used for pesticides, pharmaceuticals,food ,cosmetics should not contain heavy metals.For grinding some non-metallic mine materials, the beads should have similar components of them(such as use zirconium silicate beads or composite ceramic beads for grinding zirconium silicate, and use alumina beads for grinding Al2O3  powder).

2、  the key performance indications of the beads

2.1 Density

Higer density always means greater grinding efficiency, high viscosity slurry should choose larger density beads, for example, the offset inks and printing inks generally using Y-ZTP beads of Φ0.2-Φ0.8.

2.2 hardness

The hardness of the beads should be higher than the raw materials. On the other hand,high hardness beads will increase the wear of the exposed parts of the equipments. This wear can be optimized by controlling the amount of filled beads, the viscosity of slurry and the rate of flow.

2.3 wear resistant

Try to use beads with less wear-resistant. The wear-resistant does not only base on the materials of the beads themselves, but also based on the test conditions.Generally, the manufactures of beads always measure the wear values under the environment with water medium.if the beads are harder than raw materials, the self-abrasion wear may have good corresponding relation with the actual-abrasion wear;and vise versa. So it is suggested that before choosing the type of beads, the actual wear should be tested.

2.4 strength

The beads must not be broken during the running,especially for the sand mills with high-density energy. The higher bending strength and tenacity the beads have ,the less possibility of fragmentation there will be.Y-TZP beads are the strongest products on the market.

3、  Size

The size of the beads decide the contact points between beads and raw materials,on the premise of  having enough power, the smaller size,the higher efficiency.as well, the media seperation systems of equipments decide the sizes, for the screen separation system, the minimum diameter of beads should be 3 times bigger than the siece pore;for the ring type separation systems, the minimum diameter of beads should be 4 times bigger than the ring gap;for current dynamic centrifuge systems,Φ0.1-Φ0.2 ultrafine grinding beads are allowed. Moreover,the size of raw materials and the requesting ultrafine products,multiple stage process, which is choosing larger size beads in the front and smaller ones at the end should be designed.in addition,choosing beads with  narrow distribution of diameter to improve the grinding effect.

 

 

the differences of glass beads and zirconium beads

The glass beads is much cheaper than the zirconium beads,but the hardness,the abrasive resistance and grinding efficiency that falls away short of the zirconium silicate beads, let us check the technical parameter of them below:

description

density

Loading ratio

Moh’s hardness

Abrasion ratio

Glass beads

2.5

1.6

6

0.88%(30h)

Zirconium silicate

4.3

2.5

7.5

0.25%(30h)

 

As can be seen from the above data, it will need more zirconium silicate than glass beads in the same mill. The kinetic energy,shearing force and friction force are also much stronger than the glass beads.it will increase the productivity greatly. And with the low abrasion ratio,it has more economic value for long term use.

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