Wet-process solid-liquid separation method for desulfurized slurry and triple box process improvement method

Abstract

The invention provides a wet-process solid-liquid separation method for desulfurized slurry and a triple box process improvement method. The wet-process solid-liquid separation method for the desulfurized slurry comprises the following steps: placing the desulfurized slurry in a reaction device, and adding lime milk till pH is 8-12; adding magnetic seeds; adding a flocculant; and performing solid-liquid separation. Owing to adding of the magnetic seeds and the function of the flocculant, solid-liquid separation can be quickly realized through magnetic flocculation, the sedimentation time is shortened, the size of a clarification tank is reduced, the floc sedimentation efficiency is improved by 50% or above, the sludge content and the moisture content of sludge can be reduced, the follow-upsludge dehydration pressure is relieved, and the sludge treatment cost is lowered; heavy metals and suspended solids can be effectively removed; part of calcium and magnesium can be removed, and softening of desulfurized wastewater is realized; adding of an inorganic coagulant can be omitted, the chemical addition is reduced, and the treatment process is simplified; the magnetic seeds can be recovered, and the recovery rate is up to 90% or above; and the wet-process solid-liquid separation method can be used for improving the triple box process and improving the pre-treatment efficiency of the desulfurized slurry.

Description

technical field [0001] The invention belongs to the technical field of desulfurization wastewater treatment, and relates to a slurry solid-liquid separation method for wet desulfurization and a triple box process improvement method. Background technique [0002] Limestone-gypsum wet flue gas desulfurization technology is currently the most commonly used desulfurization technology in thermal power plants. During the flue gas desulfurization process, limestone slurry absorbs sulfur dioxide in the flue gas to achieve desulfurization, and at the same time forms gypsum, which can be recycled. However, during the desulfurization process, other solid particles or gases in the flue gas from coal mine combustion are also absorbed. At the same time, due to the circulation of the desulfurization absorption liquid, the ionic substances in the original process water also gradually accumulate. In order to ensure the balance of the slurry circulation system of the desulfurization unit, en...

AI Technical Summary

Problems solved by technology

At the same time, in recent years, the demand for zero discharge of power plant wastewater has become higher and higher. How to achieve rapid pretreatment to remove suspended solids has become a limiting process for the zero discharge treatment of power plant desulfurization wastewater.