The processing of raw minerals refers to the further processing of products that have been processed by beneficiation according to the purpose of use. After the deep processing of the raw minerals, one case is to obtain a functional powder product that can be directly used, that is, a single mineral material; in another case, further synthesis treatment is required to prepare materials for various uses, that is, synthesis. Mineral material.
Mineral raw material processing and powder preparation processes are mainly divided into five types: morphological treatment of mineral particles, heat treatment, interface treatment and modification, chemical treatment and modification, and chemical synthesis of powder.
(1) Treatment of mineral particle morphology
The mineral particle morphology refers to the shape, size, specific surface area, porous structure, interfacial properties of the mineral monomer particles, and the filling and fluidity of the particle assembly. For example: average particle diameter, percentage of each particle fraction, degree of looseness of fiber minerals, fiber length, aspect ratio, layered surface size (particle size) ratio of plate minerals, crystal shape and crystal integrity of crystalline minerals Degree, particle size, spherical coefficient and surface smoothness of the particle material, friction coefficient, bulk density of the deposited material, stacking angle, and surface free energy change due to the specific surface area and the activity of the freshly understood surface. metal ore materials occupies an extremely important position, is one of the notable features distinguish it from other materials, but also play a precondition for mineral materials technology and physical characteristics of the interface.
The key to the morphological treatment of mineral particles is to maximize the protection of the crystal structure of minerals during the process of gradual pulverization, pulverization, cleavage or opening. Therefore, it can be divided into four processes according to the morphological characteristics and utilization range of mineral crystals. Type: grinding and stripping cleavage of flaky minerals; loosening of cotton minerals; ultrafine pulverization of granular minerals; special morphological treatment of crystalline granule minerals.
Mineral particle morphology treatment is mainly required to achieve the following objectives.
(1) Give full play to the crystal morphology of mineral materials. It can be seen from Table 4-9-1 that mineral particle materials of different crystal forms can exhibit different utilization functions to produce products with different functions. In the same type of mineral products, the difference in particle morphology quality or grade may also have different uses or performance differences. For example, when manufacturing mica reinforced polypropylene plastic, use 200HK mica powder [-62μm 84%, diameter to thickness ratio 50) Compared with the use of the same ratio of 325 - S (- 62μm 84%, diameter to thickness ratio of 30), the tensile strength of the product is increased by 8%, and the bending strength is increased by 8.75%. The use of the above two types of mica reinforced polypropylene plastic products When used in the production of pearl mica, the particle size range of mica powder is usually 5~200μm and the thickness is 0.1~5μm. When manufacturing asbestos cement products, it is required that the reinforcing fiber contains a certain amount of hard. The structure of acicular fiber, in order to disperse the fiber and filter and dehydrate the product, and improve the rigidity of the product, the fiber length to diameter ratio is better than 25 ~ 80. The production of asbestos textile products requires the use of fully loosened, carded and A soft structural fiber having a high specific surface area generally has an aspect ratio of more than 1000.
In the process of mineral material synthesis, most of the raw materials used come from natural hard minerals. To recombine and shape, minerals must be processed and then qualified powder ingredients can be used before various molding or curing treatments can be carried out. The size, gradation, morphology and uniformity of the powder particles often directly affect the quality of the material. As the performance of materials continues to increase, the demand for mineral raw materials is also increasing. Therefore, the processing of raw materials and the preparation of powders play an important role in the synthesis of mineral materials.
The processing of raw minerals refers to the further processing of products that have been processed by beneficiation according to the purpose of use. After the deep processing of the raw minerals, one case is to obtain a functional powder product that can be directly used, that is, a single mineral material; in another case, further synthesis treatment is required to prepare materials for various uses, that is, synthesis. Mineral material.
Mineral raw material processing and powder preparation processes are mainly divided into five types: morphological treatment of mineral particles, heat treatment, interface treatment and modification, chemical treatment and modification, and chemical synthesis of powder.
(1) Treatment of mineral particle morphology
The mineral particle morphology refers to the shape, size, specific surface area, porous structure, interfacial properties of the mineral monomer particles, and the filling and fluidity of the particle assembly. For example: average particle diameter, percentage of each particle fraction, degree of looseness of fiber minerals, fiber length, aspect ratio, layered surface size (particle size) ratio of plate minerals, crystal shape and crystal integrity of crystalline minerals Degree, particle size, spherical coefficient and surface smoothness of the particle material, friction coefficient, bulk density of the deposited material, stacking angle, and surface free energy change due to the specific surface area and the activity of the freshly understood surface. Metal ore material occupies an extremely important position, is one of the distinguishing features of other materials, and is also a prerequisite for the physical and interfacial properties of mineral materials.
The key to the morphological treatment of mineral particles is to maximize the protection of the crystal structure of minerals during the process of gradual pulverization, pulverization, cleavage or opening. Therefore, it can be divided into four processes according to the morphological characteristics and utilization range of mineral crystals. Type: grinding and stripping cleavage of flaky minerals; loosening of cotton minerals; ultrafine pulverization of granular minerals; special morphological treatment of crystalline granule minerals.
Mineral particle morphology treatment is mainly required to achieve the following objectives.
(1) Give full play to the crystal morphology of mineral materials. It can be seen from Table 4-9-1 that mineral particle materials of different crystal forms can exhibit different utilization functions to produce products with different functions. In the same type of mineral products, the difference in particle morphology quality or grade may also have different uses or performance differences. For example, when manufacturing mica reinforced polypropylene plastic, use 200HK mica powder [-62μm 84%, diameter to thickness ratio 50) Compared with the use of the same ratio of 325 - S (- 62μm 84%, diameter to thickness ratio of 30), the tensile strength of the product is increased by 8%, and the bending strength is increased by 8.75%. The use of the above two types of mica reinforced polypropylene plastic products When used in the production of pearl mica, the particle size range of mica powder is usually 5~200μm and the thickness is 0.1~5μm. When manufacturing asbestos cement products, it is required that the reinforcing fiber contains a certain amount of hard. The structure of acicular fiber, in order to disperse the fiber and filter and dehydrate the product, and improve the rigidity of the product, the fiber length to diameter ratio is better than 25 ~ 80. The production of asbestos textile products requires the use of fully loosened, carded and A soft structural fiber having a high specific surface area generally has an aspect ratio of more than 1000.
(3) It is advantageous for the molding of products. The mineral particle material which is sufficiently finely ground or loosened can improve its dispersibility, plasticity, rheology and other process properties, thereby significantly improving the molding process conditions of the product and improving the initial strength of the product. The increase in specific surface and surface energy improves the progress of physicochemical reaction between different substances and the ability to form tightly, and also improves the consolidation ability with cemented materials. For sintered articles, the sintering temperature can also be lowered.
Reasonable particle size ratio and fiber length-to-diameter ratio can improve the “stacking maximum density†of the filler in the composite material, so as to obtain the best product with the most economical formula and the least amount of matrix binder. Strength and performance indicators. All kinds of beneficiation milling equipment with selective high-solution function can generally be used for grinding and stripping of mineral raw materials. Better selective dissociation effects are achieved in air streams, especially in aqueous media. Chemical reaction equipment with beating and dispersing functions is also often used, and the addition of grinding aids or surfactants tends to achieve better results. Certain colloidal articles dispersed in an oil or organic solvent, such as those treated in the same oil or organic solvent, will have a better effect.
(2) Heat treatment
Heat treatment is an important means of using thermal processing to change the properties of mineral raw materials. The heating method differs depending on the purpose of the treatment, and the heating conditions depend on the thermal analysis results of the mineral being treated.
The heat treatment of mineral raw materials can be divided into three types of process: heating dehydration, thermal decomposition and pre-firing (see Table 4-9-15).
Table 4-9-6 aluminum oxide, magnesium oxide, talc, TiO 2 calcination temperature and calcination conditions purposes.
(3) Surface treatment and modification
Surface treatment and modification are processes that use various additives to treat the surface of mineral particles. This treatment may be the adsorption or coating of physical action, and often also the role of physicochemistry. The goal is to improve or completely alter the physical and surface chemistry of the particle surface.
Surface treatment and modification can be divided into four types according to the means and purpose of the treatment process: wetting and impregnation, coating treatment, coupling agent treatment and surface modification [see Table 4-9-7].
This catagory contains interior door handles for BYD.
A car's interior door handle is a small lever that you pull to release the door's hook from the vehicle frame's latch. It varies depending on your vehicle make, model, or variant. Most interior car door handles are made of plastic, while some are cast metal. Further, there are designs offering a mix of both like a plastic bezel and metal lever, or vice versa.
Both materials come with different finishes, includes the usual chrome-plated, primed, smooth or textured, chrome bezel and colored lever combination, paint to match, satin chrome, and polished. In short, there is a vast selection of parts to match your old ones. The important thing is to look for the material you prefer. For example, chrome-plated parts could come either with a plastic or metal base material. You may also choose textured levers for better grip.These vehicle-specific parts are made to match the OEM part in every way except for cost and feature:
- Stock Appearance: this replacement door handle has the same dimensions and specifications as stock, and was specifically designed to look and function the same as the original interior handle on particular vehicles.
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