Concentration of sulfuric acid pickle liquor

Claim 1

PROCESS FOR CONCENTRATION OF PICKLE LIQUOR CONTAINING FERROUS SULFATE AND FREE SULFURIC ACID, WHEREBY SAID FERROUS SULFATE IS SUBSTANTIALLY COMPLETELY RECOVERED AS SOLID FERROUS SULFATE MONOHYDRATE, WHICH COMPRISES COMBINING PICKLE LIQUOR WITH STRONG SULFURIC ACID SOLUTION TO FORM A COMBINED LIQUID STREAM, GENERATING A HOT DRYING GAS STREAM, ACCELERATING SAID DRYING GAS STREAM TO A HIGH VELOCITY BY PASSING SAID DRYING GAS STREAM DOWNWARDS THROUGH A PASSAGE DEFINED BY DOWNWARDLY CONVERGING SIDE WALLS, PASSING SAID COMBINED LIQUID STREAM DOWNWARDS ON THE SIDE WALLS OF SAID PASSAGE, PROJECTING SAID COMBINED LIQUID STREAM IN TRANSVERSE CONTACT WITH SAID HIGHLY ACCELERATED STREAM OF HOT DRYING GAS AT THE LOWER TERMINUS OF SAID PASSAGE, THEREBY DISPERSING SAID COMBINED LIQUID STREAM INTO SAID HOT GAS STREAM IN THE FORM OF FINE LIQUID DROPLETS WHEREBY SUDDEN EVAPORATION OF LIQUID WATER INTO SAID GAS STREAM TAKES PLACE, SEPARATING THE RESULTING MOISTURE-LADEN GAS STREAM FROM THE REMAINING LIQUID PHASE, COLLECTING SAID LIQUID PHASE AS A SLURRY OF SOLID CRYSTALS OF FERROUS SULFATE MONOHYDRATE IN STRONG SULFURIC ACID SOLUTION, AND FILTERING SAID SOLID CRYSTALS FROM SAID SLURRY.