Process for removing magnesium from salt-making mother liquor by use of lime

Abstract

The invention discloses a process for removing magnesium from salt-making mother liquor by use of lime. The process comprises steps as follows: S1, the salt-making mother liquor is pumped and sent toan ordinary filtering net plate, the salt-making mother liquor is preliminarily filtered, then flows through a mother liquor filter I and then is collected to a storage tank, a magnesium removal additive is added to the storage tank, and the salt-making mother liquor in the storage tank is stirred while the magnesium removal additive is added; S3, quick lime is added to a crusher to be crushed for1-2 min to be powdery lime with the size of 120-160 meshes, the powdery lime and fresh water are mixed in the mass to volume ratio being (1-1.3 kg):(0.6-1.2 L), a large amount of heat is released inthe mixing process, the mixture becomes slaked lime after being naturally cooled. Compared with conventional technologies, the provided process for removing magnesium from salt-making mother liquor byuse of lime has the advantages that a large quantity of impurities in the salt-making mother liquor can be filtered by use of a mother liquor filter I and a mother liquor filter II, and the magnesiumremoval efficiency in the following step is facilitated; the magnesium removal additive is added to the storage tank and can remove 90% of magnesium in the salt-making mother liquor.

Description

technical field [0001] The invention belongs to the technical field of lime-removing magnesium from salt-making mother liquor, and more specifically relates to a process for lime-removing magnesium from salt-making mother liquor. Background technique [0002] A variety of important chemical products are produced by using seawater and the mother liquor (bitrine) after making salt from natural brine as raw materials. There are rich potassium resources in seawater. Potassium ion exchangers are used to obtain a solution with a high potassium content-potassium-rich solution through potassium absorption and elution methods, and then the potassium-rich solution is evaporated, crystallized, and separated to produce potassium. Salt. [0003] However, because the seawater contains magnesium, it will affect the enrichment effect of the potassium ion exchanger, and the magnesium in the potassium-enriched solution will cause the quality of the finally obtained potassium product to decli...

AI Technical Summary

Problems solved by technology

[0003] But, because contain magnesium in seawater, will influence the enrichment effect of potassium ion exchanger, the magnesium in the potassium-enriched solution can cause the quality decline of final made potassium product