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Each deposit has its own characteristics. The process of processing its specific ore, various process equipment and their mutual combination cannot be determined by subjective speculation. Even high-quality ore, if the mineral processing technology is not right, will produce inferior products; on the contrary, careful scientific mineral processing technology can often select higher quality products from inferior ore.
The main characteristics of Yanshi asbestos ore wool beneficiation are multi-series process, large-scale equipment, special equipment, high-rise building, automation of process operation and many types of products.
1. Asbestos beneficiation equipment will be developed to a large scale, and equipment will be enlarged to improve efficiency, increase production, reduce operators, and reduce operating and management costs. The crude crushing operation of the new concentrator PXQ1215 hydraulic light gyratory crusher has a width of 1000mm, a production capacity of 1000t/h, and a PYT-B2235 standard spring cone crusher with a production capacity of 900t/h. The large production capacity of the crusher determines that it is suitable for large-scale enterprises.
2. According to the special needs of asbestos beneficiation, our mine has developed and manufactured many special equipment for asbestos dressing, which plays an important role in production.
3. The plant is developed to the upper level to achieve material self-flow as much as possible, greatly reducing the transportation equipment . The new concentrator's selection workshop has 8 floors and a height of 43 meters.
4. In terms of automation, the new concentrator uses computer technology to realize all the local or centralized automatic control of the motor and the automatic adjustment of key parts.
5. In terms of process flow:
(1) Pay attention to the pre-selection of raw ore, and discard the waste rock as early as possible in the initial stage of the selection process, and improve the grade of the ore selected by the method of screening and enrichment (the rejection rate reaches 30%), thereby reducing the processing capacity of the ore and simplifying the process. Reduce equipment wear and material consumption. [next]
(2) Make full use of the selective crushing performance of asbestos ore. While uncovering the fiber, carefully protect the natural properties such as the length and strength of the fiber, and use multi-stage crushing (four segments of fine crushing and cotton uncovering operation), and each piece of crushing is assisted. Small crushing ratio (1.5 ~ 2) carefully uncover the cotton. In asbestos beneficiation, fine crushing is an important operation. The key to the effectiveness of this operation is the fine crushing equipment. Therefore, we have successfully used the fine-staple cotton unwinding equipment such as the vertical shaft hammer crusher and the opener. The working principle of these devices is mainly impact, which has both impact and abrasion. The impact effect is beneficial to the selective crushing of asbestos ore, fully uncovering cotton (and can protect the fiber); the grinding and stripping effect is beneficial to the release of acicular cotton and bundled fibers, and sufficient cotton opening. The selectivity of the impact crusher is higher than that of any other crusher, especially in the case of crushing single veins and complex veins, asbestos fibers are enriched in fine grades, avoiding long fiber breakage and hard structures to the utmost extent. The flocculation (guaranteeing the product has a good hydrophobic velocity), destroying the natural properties of the fiber, and at the same time, avoiding the repeated grinding and blending of the pulverized gangue dust and the fiber, thereby deteriorating the quality of the fiber.
(3) In the sorting process, according to the length of the fiber, the fibers are respectively selected in the order of length and then short, and enter the respective fiber processing systems. The new plant has three fiber processing systems. In the sorting operation: the natural length of asbestos fiber and the protection of physical and mechanical properties; the maximum recovery of asbestos fibers in ore; the proportional use of asbestos fibers of various lengths, and the complete removal of inclusions and sand removal And dusting.
(4) The air treatment system of the newly selected plant is mainly composed of dust removal riser, horizontal dirty air duct, large bag dust chamber and clean air duct. The dust collection and process suction system and dust removal riser and dirty level of each branch are dirty. Air air ducts are connected, a centralized vacuum system driven by a group of parallel fans. It has reliable operation, saves power, facilitates the operation adjustment of the air system, and has great adaptability to process and equipment changes. The amount of production stroke can usually be adjusted at will, and it is largely adapted to the needs of different operations (rough selection, selection) and changes in the properties of raw ore, so that the quality of finished cotton is stable.
(5) In the selection and purification operation of asbestos fibers, the screening equipment with different screening mechanism is used to overcome the entanglement of the long and short fibers which are easily caused by the same sieve type, and the dust and powder fibers adhere to the asbestos fibers. Clean up the puzzle. It is very important to control the dust content of asbestos fiber, especially for asbestos cement grade asbestos. The current research shows that the reinforcing performance of asbestos fiber used in cement products will be greatly affected by the dust content, and the content of -200 mesh will increase by 5 percentage points. The strength of cement products is reduced by 16 units. Therefore, the fine particles and dust contained in the asbestos cement grade asbestos are removed as much as possible without impairing the fiber length, so that it is sufficiently purified.
(6) The concentrating plant has realized the automatic production line of asbestos packaging for automatic metering and compression packaging, which makes the product shipment more convenient, safe and clean, and eliminates the problem of dust in the shipment. [next]
6. The product classification is fine, and the user has good mouth-to-mouth. On the basis of the original grade grades, the grade grades have been expanded according to the degree of cotton opening, strength, purification degree, and special requirements of the users, so that different grades are suitable for the ingredients of different products, because the new mine selection plant has adopted The above advanced technology plays an important role in improving the quality of the products to ensure various performance indexes. After repeated comparisons, the tensile strength is generally greater than 2900 MPa (296 kg/cm 2 ), and the highest is up to 3900-5800 MPa (398~). 592kg/cm 2 ), it has strong alkali corrosion resistance, the general alkali corrosion amount is 0.73%, the ablation amount is generally 12.36~13.48%, the heat resistance temperature is generally 500~600°C, and there is good heat insulation. Insulation performance (thermal conductivity 0.154K / h • m • ° C), so in the cement products, friction products, sealing products, the best results, welcomed by users.
Inspection is a very important technology. The control of the entire asbestos beneficiation process is organized around them. The quality of the products depends directly on their judgment. After years of production practice, our mine has trained a large number of skilled professional inspections. personnel. The quality inspection items can be different according to the product grade and user requirements. The commonly used items are: F500 standard sieve test, wet classification, Rotapu sieve test, rinse test, uncovered cotton content determination, specific surface area determination. Wait. The relatively complete inspection methods and high-quality professionals ensure that the quality control of asbestos is good, and it can fully meet the requirements of users for various purposes. It can be used directly without further processing.
To this end, there are specialized quality control agencies and a series of quality management systems and methods. The task of quality management is to maintain close contact with the sales department and the concentrator in order to ensure the high quality, uniform and competitive products required by the customer, and to formulate production and cost based on the principle of sales guidance production and production service sales ( The market sales strategy goal consisting of price, quality, variety and service, depending on the competitor's products as the “reference pointâ€, producing better products, continuously improving production speed and reducing production costs, continuously improving product quality, and committing to no Quality defects to ensure and meet the specific needs of the product company. "Based on the user, strict control" is not only the purpose of Yankuang quality inspection, but also the testing purpose of Yankuang technical progress.
Mangai new production of asbestos ore beneficiation plant in actual production capacity of five million tons, it is noted in the Altun Mountains performance design of a particular resource, ore body containing rock wool quality magnesium-rich ultrabasic rocks, the deposit produced The content of SiO 2 , MgO and H 2 O + in the chemical composition of asbestos is close to the ideal value, which is a standard serpentine asbestos. The color is generally yellow-green, the fiber is white after splitting, the silk is shiny, the fiber has good splitting performance, and the texture is soft. It is a crystallized serpentine. In the chrysotile asbestos, the mining material of "China's cotton" is ultra-basic. Rock, but at the same time can replace the performance of carbonate rock, so it is the best in the same kind of raw materials.