Wet screening and positive-pressure concentrated phase conveying processes for natural graphite

Abstract

The invention discloses wet screening and positive-pressure concentrated phase conveying processes for natural graphite. The wet screening process mainly comprises the following steps: preparing graphite pulp, defoaming, performing wet screening, and taking oversize positive-mesh graphite, namely the product; and performing secondary wet screening on undersize negative-mesh graphite, performing dehydration and drying, and performing positive-pressure concentrated phase conveying to obtain the negative-mesh graphite product. The positive-pressure concentrated phase conveying process mainly comprises the following steps: conveying the undersize negative-mesh graphite into a conveying tank; filling compressed air into the tank from the bottom of the conveying tank until the graphite and air in the tank form a fluid state; and conveying the fluid-state graphite to a specific place along a conveying pipeline. The processes have the characteristics that: the wet screening process can improve the large-scale extraction ratio of the natural graphite by 3.65 percent and improve the recovery rate of the graphite by 5.34 percent; and the positive-pressure concentrated phase conveying processhas high gas-solid ratio, and can reduce the tail gas emission to 20 cubic meters / hour from the original 11,000 cubic meters / hour.

Description

technical field [0001] The invention relates to a graphite screening and conveying process, in particular to a natural graphite wet screening and positive pressure dense phase conveying process. Background technique [0002] At present, the technology adopted in the screening and transportation of the graphite industry is mainly the process of using square sieves for dry screening and dilute phase negative pressure transportation. Disadvantages of this process: [0003] One is the traditional high square sieve dry screening. After the negative mesh (-100) of the graphite product reaches the carbon content requirement, the dehydration, drying, grading and other processes are carried out, which results in large flake graphite (+100 mesh ) In the front-end grinding and floating process, on the premise of meeting the carbon content requirements, the grinding and flotation are still carried out in the process, resulting in the destruction of large scales and the loss of large sc...

AI Technical Summary

Problems solved by technology

[0003] One is the traditional high square sieve dry screening. After the negative mesh (-100) of the graphite product reaches the carbon content requirement, the dehydration, drying, grading and other processes are carried out, which results in large flake graphite (+100 mesh ) In the front-end grinding and floating process, on the premise of meeting the carbon content requirements, grinding and flotation are still carried out in the process, resulting in the destruction of large scales and the loss of large scales of graphite

[0004] The second is the traditional dilute-phase negative pressure conveying process. In the process of conveying graphite semi-finished products, when the material is less than the design capacity, it will cause waste of power resources; The efficiency is greatly reduced, resulting in a large amount of graphite being discharged into the air through the positive pressure exhaust pipe of the fan with the 9-26-6.3 high-pressure centrifugal fan at an air volume of 11,000 cubic meters per hour, which not only causes serious environmental pollution , and the recovery rate of graphite is greatly reduced

[0005] In short, dry screening and negative pressure dilute phase conveying technology are used in the graphite industry, which has disadvantages such as complex process, high energy consumption, environmental pollution, low graphite recovery rate, waste of resources, etc.