High-frequency vibrating fine screen
The design principle is: when screening slurry containing fine-grained materials, the width of the screen surface plays a more important role than the length or area. As long as proper feeding and slurry concentration are maintained, multi-channel feeding can ensure efficient classification effect of high-frequency vibrating fine screen.
The high-frequency vibrating fine screen uses the combined effect of continuous water flow and high-frequency vibration to achieve classification of fine-grained materials. A washing tank lined with wear-resistant rubber is installed between the two screens. According to needs, each screen machine is equipped with 1 to 3 washing tanks. For example, the high-frequency vibrating fine screen manufactured by Yantai Xinhai Mining Machinery is lined with Contains patented wear-resistant rubber, which is wear-resistant and anti-corrosion, and has high grading efficiency. In order to re-slurry the products on the screen that have been dehydrated on the previous screen in the ore washing tank, the spray device directly sprays water into the ore washing tank, which can make the products on the screen re-slurry in the ore washing tank, and the solid particles are completely turned over and condensed. The pellet mud is broken into pieces and then screened to separate coarse and fine materials. Through multiple times of washing, screening and repeated pulping, the particle size specifications required for raw materials for ferroalloy production can be fully met.
Screening machine
It is a uniquely designed screening equipment whose screen surface moves in a linear trajectory. The screening machine is assembled by chains and sprockets. The individual tensioned screen surfaces are hinged together to form a chain-shaped screen surface. When coal slurry is screened, the screen surface moves in a straight line and is installed on the screen surface. Under the action of the water spray system at the top and bottom, fine particles are screened out. This water spray device provides the necessary fluidization and enables the feed materials to achieve loose stratification on the screen surface, so that fine-grained materials can easily pass through the material layer and screen holes. This screening machine adopts a rectangular screen hole to avoid clogging when screening fine materials. Since there is no vibration effect, the screen material can be selected arbitrarily without considering its toughness, which makes it easy to select the screen material that can provide the largest mesh area and thus obtain the maximum screening speed. Through the up and down and back and forth movement of the screen surface, the screening machine's processing capacity can reach twice that of a screening machine with the same floor area.
Electromagnetic high-frequency vibrating screen
Electromagnetic high-frequency vibrating screen is a new screening machine that has obtained a national patent. This screen is designed with a new principle and has a novel structure. It is suitable for dry and wet screening of various materials. Its structural characteristics and working principle are: a vibration system mainly composed of electromagnetic exciters arranged outside the screen box drives a vibrating arm arranged under the screen. The vibrating arm is equipped with a rubber cap along the full width of the screen surface. The rubber cap Hold the screen and vibrate it. Each screen machine has several groups of vibration systems arranged longitudinally, which are centrally controlled by an electric control box. Each group of vibration systems independently drives the vibrating arms to vibrate the screen. The amplitude can be adjusted in sections at any time. The screen adopts folding hooks at both ends and is tensioned longitudinally. The screen surface is installed with a certain inclination and is adjustable. Under the action of its own weight and high-frequency vibration of the screen surface, the materials flow, stratify, and pass through the screen along the screen surface.
High-frequency vibrating screen is mainly used in the coal preparation plant for dehydration and recovery of coarse and fine coal slime. It can also be used for ash reduction of flotation products and coarse separation before flotation. It is also used for dewatering of heavy medium coal preparation process. In media and coal slime water treatment systems, high-frequency vibrating mesh screens have also been successfully used. In addition, in simple coal preparation plants, high-frequency vibrating mesh screens recover low-ash clean coal from coal slime water and have also achieved high economic benefits. Pyramid pool
The pyramid pool is composed of several juxtaposed reinforced concrete containers with pyramidal bottoms; there are no partitions between and inside each classification chamber, and the inclination angle of the pyramid bottom is 65 ~70b; One end of the pyramid pool is the feed end, and the other end is the overflow end. The sediment sinks to the bottom of the cone, and a gate is installed at the bottom of the cone to discharge the sedimented materials; the overflow of the pyramid pool is automatically discharged, and the underflow is manually controlled by the valve. Control emissions. It is precisely because of manual control that it is difficult to control the classification granularity, which is a major flaw in pyramid pool classification.
Tilted plate (inclined tube) grading equipment
Although the above hydraulic grading equipment has simple structure, low operating cost, small maintenance, small fluctuations in feed materials, and factors that affect the grading index. It has the advantages of less particle size and strong adaptability. However, since the density, shape and sedimentation conditions of the particles all affect the sedimentation speed, the particle group mixing phenomenon is serious during classification and the classification efficiency is not high. The more prominent problem is that these devices occupy a large area and have low processing capacity per unit area.
For this reason, people developed inclined plate (inclined tube) hydraulic classification equipment.
The working principle of this classifier is: the slurry is fed downward from the vertical pipe, merges with the horizontal flushing water at the bottom and enters the tank. The fine particles rise with the water flow and become overflow, and the coarse particles fall on the slope. , slides upward along the slope under the action of water flow, crosses the top of the cone, and falls into the sand discharge channel. Under the action of additional water, the coarse particles that finally fall to the bottom become sedimentary sand. The separation particle size can be changed by adjusting the flushing water, supplementary water, ore feeding volume and slope slope to adapt to the needs of materials of different sizes. The height-to-diameter ratio of this equipment is generally 3 to 4, and the overflow discharge path is short, which can effectively avoid fine particle circulation short circuits. The minimum separation particle size can reach tens of microns, and the classification efficiency can reach more than 70.
Hydrocyclone
The structural feature of the hydrocyclone is a cone with a small angle (generally 10~20b). It is currently one of the effective equipment for concentrating and classifying coal slurry water. one. A typical static cyclone is composed of a cylinder and a cone, including overflow tubes, underflow tubes, feed tubes and other main components. Its working principle is: the suspension enters the cylinder along the tangential direction through the inlet pipe and spirals downward; the solid particles tend to settle toward the cyclone wall under the action of centrifugal force; the coarse particles are subject to greater centrifugal force. action, move toward the wall of the cyclone, and are discharged from the bottom of the cyclone with the external cyclone, forming an underflow; the fine particles, due to the small centrifugal force, have no time to settle and are discharged from the overflow pipe with the internal cyclone, forming an overflow. flow, thus realizing the separation of materials of different particle sizes.
The hydrocyclone has the advantages of simple structure, easy operation, large production capacity, high separation efficiency, small footprint and no transmission parts. It is lined with Xinhai wear-resistant homesickness, wear-resistant and anti-corrosion. , has been widely used in pre-sliming desliming, media recovery, coal slurry water concentration and other operations in coal preparation plants, and has achieved significant economic benefits.