A kind of calcium magnesium mud treatment and nitric water recovery method

Abstract

The invention discloses a calcium mud treatment and nitrate water recycling method and an apparatus thereof, and relates to a calcium mud treatment and nitrate water recycling method in the preparation of anhydrous sodium sulfate and an apparatus thereof. The method comprises the following steps: 1, filtering a supernatant obtained after clarifying reacted nitrate water through a non-valve filter to recover nitrate water; and 2, clarifying a lower-layer turbid solution obtained after clarifying reacted nitrate water, filtering the obtained supernatant through the non-valve filter to recover nitrate water, filtering the lower-layer mud through a rotary-drum vacuum filter, filtering the produced clear liquid through the non-valve filter to recover nitrate water, and allowing produced calcium magnesium mud to enter a subsequent treatment operation. The apparatus comprises a nitrate water reaction clarifying device, a mud clarifying device, the non-valve filter and the rotary-drum vacuum filter, the nitrate water is filtered through the non-valve filter for recovery, and the mud is filtered through the rotary-drum vacuum filter and then undergoes the subsequent treatment. The calcium mud treatment and nitrate water recycling method and the apparatus thereof have the advantages of small environmental pollution, effective treatment of the calcium magnesium mud, effective recovery of the nitrate water, and high quality of recovered nitrate water.

Description

technical field [0001] The invention relates to a method and a device for calcium magnesium mud treatment and nitric water recovery in the preparation of anhydrous sodium sulfate. Background technique [0002] At present, there are mainly two methods for the treatment of calcium sludge and the recovery of nitric water. In the first method, the raw nitric water is preheated by a plate heat exchanger. After preheating, the raw nitric water is pumped into the preheating tank, and then into the reaction clarification tank. The mud in the lower layer of the rear reaction tank is pumped to the calcium mud tank through the mud pump, and the supernatant liquid is filtered through the inclined plate clarifier and sand filter to recover the nitric acid water. The calcium mud in the inclined plate clarifier is also discharged to the calcium mud tank, and then the calcium mud tank is The calcium mud is separated by a plate and frame filter press, and the calcium mud slag is transported...

AI Technical Summary

Problems solved by technology

There are many defects in both methods: high environmental pollution, low recovery rate of nitric water, and poor quality of recovered nitric water impurity content; sewage pumps are prone to failure in the production process, high maintenance costs, and easy to pollute the environment, and the waste of nitric water Big

In addition, the plate and frame filter press equipment has a large weight and volume, and this type of sludge dewatering machine adopts the intermittent operation mode, which can produce 50kg / h solids per hour, and the production capacity is small; moreover, the equipment needs to be guarded by special personnel. Poor automaticity; many moving parts, unstable; high equipment investment; difficult maintenance; complicated operation, special management is required; Continuous operation, small processing capacity, low working pressure, ordinary material square plate is not pressure-resistant, easy to break, consumes a lot of filter cloth, it is difficult to keep the plate frame unattended, and the filter cloth often needs to be cleaned manually

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