Calcium chloride wastewater concentration material selection
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Dear friends, there is an existing calcium chloride monochloride wastewater concentration project, which contains about 5% calcium chloride and a water volume of 9T/H. Now I want to evaporate and concentrate it to about 70% and then flake it to produce calcium chloride dihydrate. However, the corrosion data manual seems to say that pure titanium is not suitable for such high chloride working conditions. I heard that TA10 can be used for such working conditions. I don’t know what material you choose for such working conditions.
If the temperature and pressure are suitable, you can choose graphite
Titanium has limited corrosion resistance in HCl, but unlike other metals, it will be in a passivation state rather than a corrosive state when oxygen, Fe3+ and Cu2+, nitrate, chromate, chlorine, and other oxidizing impurities are dissolved. In commercial applications, including in hot dilute acids, there are often sufficient impurities to provide good protection. For example, the addition of 0.2% FeCl3 reduces the corrosion rate of unalloyed titanium in boiling 4% HCl from 21.4 mm/yr (843 mils/yr) to 0.01 mm/yr (0.4 mils/yr).
This post was finally edited by Wang Genrong on 2017-3-5 08:32 to recommend the use of graphite concentrator. The graphite concentration device consists of a graphite evaporator, a graphite separation tank, a graphite preheater, a graphite condenser, a pipeline system and a vacuum system. If you need further communication, please contact me. -
This post was last edited by Wang Genrong at 2017-3-7 09:54 to consider glass-lined thin film evaporators.
Are there no metal materials with suitable cost performance?
Thank you, do you have any data on the corrosion of titanium in high chloride salts?
The amount of water is large, graphite is not considered for the time being, thank you.