A modified dolomite used for desalinated water conditioning and tempering

Abstract

The invention provides modified dolomites for hardening and tempering desalination water and belongs to the technical field of seawater desalination. The modified dolomites are characterized by being prepared by modifying dolomite raw ores, the modification process includes a light roasting stage, a carbonation stage and a stabilization stage, the prepared modified dolomites are loose in crystal structure and large in porosity and are uniformly distributed, the porosity is not lower than 10%, more than 50 times of the porosity of the corresponding raw ores can be achieved, the dissolution rate of the dolomites is obviously improved when being used for hardening and tempering the desalination water, and the retention time is shortened by 10% compared with the retention time of the dolomite raw ores under the same conditions. Therefore, only the desalination water is needed to flow through a hardening and tempering tank containing the modified dolomites, additional reagents are not needed in the hardening and tempering process, the produced water subjected to the hardening and tempering is slightly alkaline, is moderate in hardness and alkalinity and contains small water molecule clusters, rich beneficial mineral elements including calcium, magnesium, iron, zinc and the like and rich bicarbonate.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a modified dolomite used for conditioning and tempering of desalinated water. Background technique [0002] With the development of membrane science and technology, reverse osmosis has gradually become an effective method to solve the world's fresh water crisis. Reverse osmosis can remove most bacteria, inorganic salts, organic matter, etc. in seawater, but it does not remove all ionic components in seawater in equal proportions, and Ca 2+ , Mg 2+ , SO 4 2- The interception rate of divalent ions is higher than that of monovalent ions, which makes the buffer capacity of desalinated water relatively weak. In addition, because reverse osmosis cannot intercept carbon dioxide gas in seawater, the carbon dioxide will return to the water and be converted into HCO after passing through the membrane module to the product water side. 3 - , which will make th...

AI Technical Summary

Problems solved by technology

Although the medical stone mineralization device connected in series has a certain effect on increasing the mineral elements in the effluent, but there are many equipments and a large area, the operation is difficult, and the degree of automation is low.

[0008] The conditioning agent should meet the characteristics of portability, fast dissolution rate, no need to add chemicals during the conditioning process, simple equipment operation, and high controllability. Traditional conditioning agents cannot meet the above requirements. Therefore, a conditioning and conditioning agent that can meet the above requirements should be developed. agent is necessary

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