Whole raw metallurgical plant design (design of crushing and screening system for me tallurgical bulk matenals) on a variety of bulk materials, such as iron ore, manganese ore, limestone and coal, production plant design crushing and screening operations. The design of the metallurgical raw material whole grain workshop is an integral part of the design of the metallurgical raw material preparation plant. Whole granules are production operations that control the production of smelted products, reduce energy consumption, and control the upper limit, lower limit, and powder content of raw materials. For example, when the blast furnace uses a small, uniform, and clean raw fuel, the output of the blast furnace can be increased and the coke ratio can be lowered. The whole grain workshop generally consists of a crusher room, a screening machine room, a raw ore storage tank, a finished mineral storage tank and a conveyor system. The selection and calculation of the crushing and screening process depends on the particle size of the bulk material and the particle size of the user plant, which depends on the total crushing ratio and is calculated as follows: i=Dmax /dmax Medium i is the total crushing ratio of the crushing operation; Dmax is the maximum particle size of the incoming material, mm; dmax is the maximum particle size of the required product, mm. The total crush ratio is equal to the product of the crush ratios of the segments. The crushing ratio of each section depends on the type of crusher, the type of process and the hardness of the material.
The screening operation is mainly divided into three types: pre-screening (pre-screening), screening and grading. The pre-screening is set in front of the crusher to screen out the fine-grained material with a particle size smaller than the width of the discharge opening of the crusher to prevent excessive crushing of the bulk material and fully exert the production capacity of the crusher. The inspection screen is placed behind the crusher to control the particle size of the product and to fully utilize the crusher's capabilities. The grading and screening is located in the last section of the crushing and screening system. The materials are divided into various grades according to the needs.
When crushing and screening equipment is used to crush hard ore and medium hard ore, jaw crushers , gyratory crushers and standard cone crushers are usually used. When crushing medium-hard materials and fragile materials, jaw crushers, ring hammer crushers , impact crushers and hammer crushers are generally used. When crushing brittle materials, a roller crusher and a smooth roller crusher are generally used.
Commonly used screening machines include vibrating screens, resonance screens and probability screens. There are many types of vibrating screens and high screening efficiency, which can reach 80%-85%, mainly including inertial vibrating screen, self-centering vibrating screen and heavy vibrating screen. Inertial vibrating screen and self-centering vibrating screen are mainly used for medium and light load working conditions and medium and fine grain screening; heavy vibrating screen is mainly used for heavy load working condition and coarse and medium grain screening.
The arrangement of the crusher room and the screening room of the crushing machine room and the finished product warehouse in the whole grain workshop should be compact. The crusher chamber and the screener chamber can be placed in the same plant when conditions permit. When the number of broken sieve segments is large, in order to avoid excessive plant height, the crusher chamber and the screening machine chamber can be arranged independently.
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