Bottom flow control method for liquid-solid separating and settling tank

Abstract

A bottom flow control method for a liquid-solid separating and settling tank relates to the method for controlling bottom flow of the settling tank which is used for carrying out liquid-solid separation of material liquid. The method is characterized in that in the control process, a density meter is arranged on a bottom flow discharge pipe which is positioned at the bottom part of the settling tank, the tail end of the bottom flow discharge pipe is connected with a feed inlet of a buffer tank, a discharge port of the buffer tank is connected with a variable-frequency speed regulating pump, the variable-frequency speed regulating pump is interlocked with the density meter, the opening and the closing of the variable-frequency speed regulating pump are controlled according to the deviation between the actual measured value of the density meter and the set value, thereby controlling the discharge amount of the bottom flow at the bottom part of the settling tank. The method implements the automatic regulation process technology of the bottom flow of the settling tank when adopting the settling tank for carrying out the liquid-solid separation, thereby being applicable to all the processes which adopt the settling tank for carrying out the liquid-solid separation of the material liquid. The method is used for optimizing the production process of aluminum oxide, improving energy efficiency, controlling precision, reducing energy consumption, reducing production cost and improving labor productivity.

Description

technical field [0001] The method for controlling the bottom flow of a settling tank for liquid-solid separation relates to a method for controlling the bottom flow of a settling tank for liquid-solid separation of materials by using a settling tank. Background technique [0002] In alumina production, the settling tank liquid is usually used for liquid-solid separation of materials, and its settings are distributed throughout the alumina wet process. At present, in the actual operation process, the feed and underflow of the settling tank are manually measured once an hour, and adjustments are made according to the measurement results, especially the control and adjustment of the underflow is all based on experience. Due to the backward control method, the production efficiency is low, and the process index control fluctuates greatly. In the production of alumina, it is of great significance to realize the automatic adjustment of the bottom flow of the liquid-solid separati...

AI Technical Summary

Problems solved by technology

The automatic adjustment of the liquid-solid separation underflow in the settling tank requires an electric control valve with good performance. The existing electric control valves are difficult to meet the production requirements, and the price is expensive. The technology in the control and adjustment process is rough and simple, and cannot meet the requirements of technical conditions. ; In addition, the phenomenon o