Sea water calcium-removing concentration utilization method

Abstract

The invention relates to a method for calcium removal and condensation utilization of seawater, which relates to utilization of the seawater. The method comprises a seawater desalting plant and a seawater separating device, wherein the seawater desalting plant adopts the technique of multiple-effect evaporation, and the water generation ratio of the seawater desalting plant reaches more than 20; and the front end of the seawater desalting plant is provided with a calcium removal device which absorbs more than 95 percent of calcium ions in the seawater after directly contacting the seawater. After adoption of the method, reduction of the equipment efficiency caused by calcium scale formed by calcium salt in the seawater during the desalting process is avoided, and simultaneously the water generation ratio of the desalting plant is improved; and strong brine obtained finally can be further separated, so as to obtain chemical products such as sodium chloride, potassium chloride, magnesium chloride, industrial bromine, magnesium sulfate and so on, thereby the method improves the utilization rate of the strong brine and avoids waste and environmental pollution caused by exhaustion.

Description

technical field [0001] The invention relates to the utilization of seawater, in particular to a method for desalination of seawater. Background technique [0002] At present, the prevailing seawater desalination method is mainly based on distillation (such as low-temperature multi-effect distillation). The principle of this method is to heat seawater to make it boil and evaporate, and then condense the steam into fresh water. Since seawater contains calcium sulfate salt, calcium scale will be formed during seawater desalination, which will affect the efficiency and operation of desalination equipment. Based on the above reasons, the current production ratio of seawater desalination by distillation is generally around 8-10, which cannot be further expanded, which limits the development of the seawater desalination industry. In addition, since the concentrated brine attached to seawater desalination contains calcium salts, the obtained concentrated brine cannot be further uti...

AI Technical Summary

Problems solved by technology

Since seawater contains calcium sulfate salt, calcium scale will be formed during seawater desalination, which will affect the efficiency and operation of desalination equipment

Based on the above reasons, the water production ratio of seawater desalination by distillation is generally around 8-10, which cannot be further expanded, which limits the development of seawater desalination industry

In addition, since the brine attached to seawater after desalination contains calcium salts, the obtained brine cannot be further used and can only be discharged, causing pollution to the environment

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