Diamond micro powder, in terms of its particle size, belongs to powder finer than 80μm. Particle sizes include several levels: nano 1-100nm, submicron 0.03-1μm, microparticle 1-10μm, fine particles 10-100μm, coarse particles 0.1-1mm, etc.
The commonly used production process for diamond micro powder is:
Diamond raw material → Crushing → Shaping → Acid treatment → Washing → Ultrasonic dispersion treatment → Particle size grading → Single grade acid treatment → Drying → Particle size inspection → Weighing, packaging, and storage.
From the above production process, it is apparent that diamond micro powder production is a labor-intensive method, requiring a large amount of manual labor and time, and the production efficiency is very low. To meet different customers' requirements for different products, it is necessary to classify 18 or 24 kinds of specifications from 54-80 to 0-0.1μm, so the production cycle is quite long.
How to evaluate the quality of micropowder is a common concern for both producers and users of micropowder.
Practice shows that to obtain high-quality diamond micro powder, the following four indicators must be strictly controlled:
The size and content of coarse particles;
Particle size distribution range;
Particle shape;
Strength of diamond raw material.
Particle size distribution range and the size and content of coarse particles are the most important. The strength of the micropowder depends on the intrinsic quality of the diamond, which directly affects the particle shape after crushing and shaping.
Quality testing of micropowder is an important step to ensure whether the quality of micropowder products meets standard regulations. Only by choosing appropriate testing instruments and treating the process seriously can high-quality micropowder that meets usage requirements be produced to satisfy customers' needs.
Controlling the particle size quality of micropowder is an important step in the production process. Since the particle size of diamond micro powder belongs to the micron level and submicron level, operators work under conditions where particles are not visible to the naked eye, making it very challenging to control particle size quality. Only advanced equipment and manufacturing processes, strict production management, and advanced testing methods can guarantee the production of high-quality micropowder that meets usage requirements to satisfy users' needs.
From the user's requirements perspective, the geometric parameters affecting the performance of diamond micro powder are particle shape, particle size, particle size distribution, and strength. Particle size is the most important characteristic among all physical properties. To correctly express this characteristic value and form a consensus and unity on particle size between the supply and demand parties for the same particle size sample, it is necessary to specify the measurement method and representation method of particle size in standards or supply contracts. Representing particle size using the diameter of a circle with an equivalent area to the particle's projection outline area (i.e., equivalent area circle diameter) is a common practice in powder engineering disciplines and is also normally used in the current world standards for superhard material micropowder particle size detection and production practices.
In the production of diamond micro powder, acid and alkali treatment needs to be carried out on raw materials and products, which will discharge harmful gases and wastewater, endangering the operators and polluting the environment. To protect human health and ecological balance, environmental protection regulations specify emission standards for harmful substances in industrial exhaust gas and wastewater. Only when corresponding standards are met can exhaust gas and wastewater be discharged.
In the acid treatment process of diamond micro powder, harmful gases such as chlorine gas, nitrogen oxides, and sulfur oxides will be generated. Large-scale micropowder enterprises have special rooms for acid and alkali treatment processes, equipped with dedicated ventilation cabinets, through which the generated exhaust gas is concentrated and discharged outdoors into a neutralization condenser tower. Only the tail gas that meets emission standards after three-stage neutralization treatment can be discharged.
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