Vacuum belt filter leaching method

Abstract

The invention discloses a vacuum belt filter leaching method, and belongs to the field of wet-process desulfurization production. The vacuum belt filter leaching method is characterized by comprisingthe following steps: a, mounting a spraying device on a vacuum belt filter, and arranging two rows of wide-angle fan-shaped spray nozzles of the spraying device above a filter cake alternatively in aspaced mode; b, regulating the angles of the spray nozzles of the wide-angle fan-shaped spray nozzles to be 60-120 degrees, setting pressure drop to be 0.2-0.4 Mpa, controlling water spraying amount of single wide-angle fan-shaped spray nozzle to be 0.02-0.08 m<3> / h, and controlling a ratio of flushing water amount to sulphur amount to be 3 to 5; and c, starting a primary sprayer of the spraying device, performing primary spraying cleaning on the filter cake; starting a secondary sprayer, performing secondary spraying cleaning on the filter cake; and finally starting a tertiary sprayer, performing tertiary spraying cleaning on the filter cake. The vacuum belt filter leaching method can guarantee vacuum degree of filter cloth, reduces moisture content of sulphur paste, gains balance betweenthe leaching effect and water usage mount, and realizes the good energy-saving environment-friendly effect.

Description

technical field [0001] The invention relates to the technical field of wet desulfurization production, in particular to a vacuum belt filter washing method. Background technique [0002] The vacuum belt filter is a high-efficiency equipment that uses filter cloth as the filter medium and makes full use of the gravity of the material and vacuum suction to achieve solid-liquid separation. advanced features. Moreover, the operation is simple and the degree of automation is high, so it is widely used in metallurgy, mining, papermaking, food, pharmaceutical and other industrial fields. [0003] The vacuum belt filter uses an integral annular rubber belt as a vacuum chamber. The endless rubber belt is driven by the motor to run continuously, and the filter cloth is laid on the belt to run synchronously with it, and the belt is in contact with the annular friction belt on the vacuum slide table to form a water seal. The slurry is evenly distributed on the filter cloth by the dis...

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Problems solved by technology

[0009] The vacuum belt filter rinsing device disclosed in this patent document, although the impurities in the leaching solution are not easy to accumulate in the rinsing hopper, which makes the rinsing hopper easy to clean, but there are also large droplets of washing liquid and a small distribution angle, which makes the leaching The problem of small washing coverage area requires multiple washings to clean the filter cake, and the length of the filter cloth is long; the eluent is easy to break through the sulfur paste filter cake, resulting in a decrease in the vacuum degree of the filter cloth, and the high water content of the sulfur paste. It does not meet the requirements of filtering sulfur in complexed iron wet desulfurization process

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