Improvement method for air use of vertical disk filter

Abstract

In production, the air pressure of a vertical disk filter system is relatively lowered to affect the normal production along with the increase of yield of aluminum oxide; in addition, a low-pressure machine frequently stops to interrupt air supply, so that a material is precipitated in the vertical disk filter and an air pipe is blocked to cause production accidents. An improvement method provided by the invention comprises the following steps: 1, increasing the air supply pipe diameter of a vertical disk, namely, additionally connecting a pipe to the vertical disk filter on a main pipeline; 2, additionally arranging a high and low-pressure air intercommunication valve, connecting a pipeline to a low-pressure air master pipeline on a high-pressure air pipe with relatively massive sufficient air supply and mounting an electric valve at the junction of the pipeline and the low-pressure air master pipeline, connecting a controller to an operating room, immediately starting the electric valve in the operating room to connect high-pressure air into a low-pressure air supply pipe network to supply air for 5-10min when the low-pressure machine abruptly stops, closing after a standby low-pressure machine is started to supply the air normally so as to guarantee that a stirring air pipe of the vertical disk is not blocked and guarantee the stable operation of production. The method can solve the technological problem of air supply of a single low-pressure machine, guarantees the normal air use of the vertical disk filter and guarantees the stable and high production.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to an improved method for air use of a vertical disc filter. Background technique [0002] In the process of producing alumina by the Bayer process in the No. 1 alumina branch of China Aluminum Corporation Shanxi Branch, the decomposed slurry is classified and overflowed by a cyclone, and sent to a vertical disc filter for seed filtration. The cake is mixed with the Bayer process slurry as seeds and sent to the seed tank, and the filtrate is sent to the evaporator for concentration. The specification of the vertical disc filter in this factory is GP2-240, and the filtration area is 245m 2 , Using low-pressure air with a pressure above 0.20MPa as the power to stir the material and blow off the filter cake. In production, with the increase of alumina output, at least 6 vertical disc filters are running in parallel at present, and the system wind pressure is low, which affects normal...

AI Technical Summary

Problems solved by technology

[0003] The vertical disc filter is a large wind user, about 240m 3 / min, accounting for about 70% of the total air volume, but its pipe diameter is too small, 20.32cm (8 inches) pipe, resulting in insufficient wind for the vertical plate and low wind pressure

[0004] A single low-voltage machine supplies air. When the operating parameters exceed the set value or the instrument malfunctions due to a power failure, the equipment suddenly stops, and the entire pipe network system will lose pressure and stop the wind in an instant, affecting the normal production of users.

In particular, the vertical disc filter is stirred by wind pressure, because the solid material content is 400g / L~700g / L, after the stirring is stopped, the material will precipitate soon, and the air pipe will be blocked, which will affect the normal production.

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