Note: The relative recovery capabilities of various inorganic acids are approximately as follows: hydrochloric acid ≥ nitric acid > sulfuric acid > hydrofluoric acid > phosphoric acid
Waste acid from titanium dioxide production process
Question:
The existing waste acid treatment process - the concentration method, uses a graphite evaporator for high negative pressure evaporation and concentration.
Problem 1: Blockage (aggregation of titanium dioxide particles and crystallization of ferrous sulfate) Problem 2: High energy consumption (steam consumption: single-effect 1.2 tons, double-effect 0.7 tons) Solution:
Sulfuric acid and metal ions can be separated, avoiding the crystallization of ferrous sulfate. Moreover, the recovery rate of the acid is very high.
Diffusion dialysis for nitric acid recovery
