Method for preparing ferric chloride by spent pickling solution
A technology for polymerizing ferric chloride and pickling waste liquid, applied in the fields of environmental protection and environmental chemical industry, can solve the problems of low investment, pollution of pickling waste liquid, etc. Effect
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[0017] Example 1
[0018] Add 600L of hydrochloric acid pickling waste liquid with Fe(II) content of 165g / L, 19.8L of concentrated nitric acid with a concentration of 65-68% and 80L of concentrated hydrochloric acid with a concentration of 36-38% into the corrosion-resistant reactor, and stir thoroughly , Under the condition of 1.0 atmosphere pressure and continuous oxygen, control the temperature at about 90℃, react for 90 minutes, the base degree is 8-16%, the total iron content is 13.8%, Fe(II)<0.1% and stable performance Polyferric chloride products.
Example Embodiment
[0019] Example 2
[0020] Add 600L of hydrochloric acid pickling waste liquid with Fe(II) content of 145g / L, 16L of concentrated nitric acid with a concentration of 65-68%, and 70L of concentrated hydrochloric acid with a concentration of 36-38% into the corrosion-resistant reactor, and fully stir. Under the conditions of 1.2 atmospheres and continuous oxygen supply, the temperature is controlled at about 95 DEG C, and the reaction is 70 minutes to prepare a polyferric chloride product with stable performance with a base degree of 8-16% and Fe(II)<0.1%.
Example Embodiment
[0021] Example 3
[0022] Add 600L of hydrochloric acid pickling waste liquid with a Fe(II) content of 110g / L, 12L of concentrated nitric acid with a concentration of 65-68% and 50L of concentrated hydrochloric acid with a concentration of 36-38% into the corrosion-resistant reactor, and stir thoroughly. Under the condition of 1.5 atmospheres and continuous oxygen supply, the temperature is controlled at about 110 DEG C, and the reaction is conducted for 60 minutes to obtain a polyferric chloride product with stable performance with a base degree of 8-16% and Fe(II)<0.1%.
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