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Non-metallic minerals, together with metal ore and fuel mines, are known as the three pillars of the materials industry. The development of the non-metallic mineral industry is one of the important indicators to measure the country's scientific and technological progress and industrial development. The value of non-metallic minerals in many industrialized countries has exceeded that of metal ore. Due to the unique physicochemical properties of non-metallic mineral products, the application of non-metallic mineral products has penetrated into almost all industrial sectors and played an increasingly important role in the national economy. The use of non-metallic minerals depends on the degree of deep processing, including ultra-fine pulverization, ultra-fine grading, fine purification and surface modification. Among them, effective ultra-fine pulverization is the premise and guarantee for various deep processing. Therefore, the development of ultra-fine pulverization technology determines the rational development and comprehensive utilization of non-metallic mineral products to a certain extent. After decades of research and development, especially in the past ten years, the non-metallic mineral industry has achieved tremendous development. Its deep processing technology has been continuously improved, narrowing the gap with industrial developed countries, and basically meeting the raw materials needed in its own industry and related fields. Quality requirements. Ultra-fine pulverization and grading technology has been able to process 10 to 1 μm of various non-metallic mineral powder raw materials as required. Most of the ultra-fine pulverization and fine grading equipment can be produced. The equipment performance and supporting technology are gradually approaching or reaching the international advanced level. Some equipments have new unique features in terms of structural performance. The preparation technology of mineral raw materials has been able to meet the special requirements of automobile, paper, rubber, plastic, machinery, ceramics, microelectronics (3) powder shape [4] [5]. Some non-metallic mineral products impose strict shape requirements on their shapes to suit different needs. For example, wollastonite for reinforcing composite materials, its ultrafine powder is required to maintain its original needle-like crystal state as much as possible, so that the wollastonite product becomes a natural short fiber reinforced material, and its aspect ratio requirement is >8-10; Due to its multi-layer structure, the mica powder is used as a dielectric material, a high-grade pearl paint, a pearl paint material and a pearlescent pigment. The mica powder is required to be in the form of a sheet. The diameter-thickness ratio of the obtained particles should be ensured as much as possible during the crushing process. The surface should not have too many scratches, otherwise it will affect its optical effect, its diameter-thickness ratio is >40-60; paper-coated grade kaolin hopes to maintain the characteristics of flake minerals while superfine pulverization, improve the powder Coating cloaking ability.
2 Development status of non-metallic mineral superfine crushing equipment Superfine crushing equipment is the key to its overall technology. Before the 1980s, there were few manufacturers of superfine pulverizing equipment in China, and the required products were mainly processed by imported equipment or directly imported. After the 1980s, through the introduction, digestion, absorption and organization of technical research, began to develop and develop all kinds of ultra-fine pulverization and fine grading equipment. So far, the number of manufacturers of ultra-fine pulverizing equipment has reached dozens, and its equipment performance has reached the international advanced level. In recent years, dozens of patents have been published every year.
which density is 9~50KGS/M³. It can be automatic cutting the foam into difference sizes
which is according to client`s requirement. It can be realized numerical control with accurate
and convenient ration during the whole production. It becomes more easily and stable to
operate the machine.
ï‚ Computerized control system
It can be realized numerical control during the whole production. It is very easy to
operate with its humanization consideration design. It is able to store 100 formulations in
advance.
ï‚ Automatic formulation function
The computer can be automatic to generate formulation for your reference and
calculate the dosage of material if you input the density and color which you need. The
computer can be automatic to check if the formulation is correct when you give the input of
material.
ï‚ Costing function
The computer can be automatic to display the input of chemical material and the output
of foams in each foaming produce.
ï‚ Printing function
All information including the formulation, the input of chemical material and the output of
foams can be printed. The exact data can be used to strengthen management.
ï‚ Electronic metering system
The metering system is adopted the advance electronic metering pumps from U.S.A.
and the monitoring equipment. Through computer, it can display formulation`s dosage of 12
groups` chemical material and actual supply in figure or diagram. The metering system can
be automatic to adjust it with great precision when the actual supply cannot meet the
formulation requirement. It is the base to produce the good foam and to reduce the
unnecessary wastage with this function.
ï‚ High speed mixing system
It adopts two steps mixing with low-pressure and high-speed. This can make the
foam`s air hole fine and smooth. It presets cycle cooling and automatic cleaning functions.
ï‚ Adjustable oven system
The width of two moving side wall can be adjusted for producing difference width foam.
The height of six steps raising platform can be adjusted for producing difference density
foam.
ï‚ Automatic cutting system
It is computerized control. It can be changing the cutting length in any time. The degree
of accuracy can be equal or less than 1mm.
It can maintain the suitable temperature of chemical material in order to producing high
quality foam.
Technical Specification:
Model SL-08FC
Chemical 12groups
Foaming type Trough foaming/Spray foaming
Speed of mixing ≤5000rpm/ min
Over length 12.5M
Fall plate 6 steps total 6.25M
Conveyor length 18M
Foam width 1.3-2.25m
Foam height ≤1.25M
Foming speed ≤8m/min
Max output 250kgs/min
Total power 70.85KW
Dimension 38m(L)×4.5m(W)×4m(H)
Abstract: This paper reviews the development status of non-metallic mineral superfine pulverization technology and equipment, and points out the existing problems and development directions.