1. Introduction to main pump positions of coal washery slurry pump
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According to different coal washing processes, the pump position names and quantitys of coal washery slurry pump are different, but generally speaking, there are mainly the following pump positions:
1) Qualified medium pump: it is responsible for conveying the qualified medium in the qualified medium barrel to the hydrocyclone to mix it with coal in the hydrocyclone to complete the separation of two phases (light phase and heavy phase). Features: the conveying medium is iron concentrate powder slurry, with small particle size, high density and large wear;
2) Thin medium pump: it is responsible for conveying the thin medium slurry in the thin medium barrel to the magnetic separator for magnetic separation, and the pure medium obtained after magnetic separation will be returned to the qualified medium barrel. Features: conveying medium slurry has small particle size, large density and large wear;
3) Medium feeding pump: it is responsible for transporting the concentrated medium in medium pool to the qualified medium barrel and preparing the qualified medium according to a certain proportion. Features: conveying medium slurry has small particle size, high density and large wear;
4) Cyclone feed pump: it is responsible for conveying the mixed slurry composed of coal and qualified medium in the mixing drum to the hydrocyclone to complete the separation of two phases (light phase and heavy phase) in the hydrocyclone. Features: the conveying medium is the mixed slurry of iron concentrate powder and coal block, with large particle size, large density, large wear, and easy to produce cavitation;
5) Sweeping pump: it is responsible for conveying the ground water or leaked slurry to the thin medium barrel. Features: vertical slurry pump is generally selected, and the requirements for flow and head are not too strict. The selection needs to be combined with the actual pipeline on site, and the speed can be appropriately higher;
6) Circulating water pump: it is responsible for conveying the clarified water in the concentration tank to the water washing system, which is mainly used to wash the magnet powder medium attached to the coal block and as system water. Features: small particle size, small density and small wear of transported slurry;
7) Thickener underflow pump: it is responsible for conveying the concentrated high concentration slime water in the concentration tank to the slime mixing drum of water washing system. Features: small particle size, moderate density and less wear of transported slurry;
8) filter press feed pump : it is responsible for conveying the high concentration slime water in the slime mixing drum to the filter press for pressure filtration dehydration to form filter cake. Features: small particle size, moderate density and moderate wear of conveying slurry.
2. Precautions for selection of coal washery slurry pump
1) The main conveying medium of coal washery slurry pump is coal slurry water or coal water mixed slurry with magnet powder, which requires wear resistance, reliable shaft seal and stable performance;
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2) The qualified medium pump delivers magnet slurry, the speed shall be controlled below 740rpm, and he flow rate and pressure should be kept abundant; The pump with good cavitation performance shall be selected. It is recommended to use auxiliary impeller + packing dynamic seal to reduce the number of maintenance;
3) The cyclone feed pump shall first ensure the feeding pressure of the cyclone; Due to the large particle size of coal in the incoming material; The impeller with larger passing particle size must be selected to avoid blockage;
4) The type selection of the filter press feed pump must comply with the operating characteristics of the filter press: at the beginning of operation, the flow is large and the pressure is small; During pressure maintaining operation, the flow is small and the pressure is large. The filter press feed pump must be a special pump type to avoid shaft breaking due to unbalanced radial force.
3.The advantages of using Slurry Pumps in coal preparation plants are mainly reflected in the following aspects:
Wear resistance and durability: Slurry pumps are designed to handle slurries containing solid particles, and their internal components (such as impellers and pump casings) are usually made of high-strength wear-resistant materials. This enables them to withstand high-wear environments, especially when the conveying medium is iron ore concentrate slurry or coal-water mixture containing magnetic powder.
Adapt to a variety of working conditions: Different coal preparation processes require different types of slurry pumps to meet specific requirements. For example, qualified medium pumps, dilute medium pumps, cyclone feed pumps, etc. each have the characteristics of adapting to slurries of different particle sizes, densities and wear levels, ensuring the efficient operation of the coal preparation process.
Reduced maintenance requirements: By selecting the appropriate pump type and sealing method (such as auxiliary impeller plus packing dynamic seal), the number of maintenance times can be effectively reduced, the stability and reliability of the equipment can be improved, and downtime can be reduced, thereby improving production efficiency.
Optimize performance to meet special requirements: For example, the cyclone feed pump needs to ensure the feed pressure and select an impeller that can pass a larger particle size to avoid clogging; the filter press feed pump adjusts the working parameters according to the operating characteristics of the filter press to avoid shaft breakage due to unbalanced radial force.
Environmental benefits: The slurry pump effectively treats and transports waste liquid with high solid content to the corresponding treatment facilities, which helps to reduce environmental pollution, protect the ecological environment, and meet the environmental protection requirements of modern industry.
Economic benefits: Although the investment cost of the slurry pump is high, its efficient operation capacity and low maintenance frequency help to reduce energy consumption and improve the comprehensive recycling of multi-metals, thereby bringing good economic benefits.
In summary, the slurry pump not only ensures the effective transportation of slurry in the coal preparation plant, but also plays an important role in improving production efficiency, protecting equipment, environmental protection, and improving economic benefits. Welcome your consultation!
This document provides guidance for inspectors on evaluating compliance of coal preparation plants with EPA emissions standards. It describes the coal preparation process, including various size reduction, cleaning, and drying techniques used. It also outlines the EPA new source performance standards for particulate emissions from these facilities, and guidance for inspectors on monitoring, record keeping, performance testing, and periodic inspections to determine compliance.
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