Patent ID: 6969429

Claim:
A process for removing an aqueous slurry suspension, comprising a blast medium and coating substance residues, produced when cleaning surfaces having a corrosion protection coating on the surfaces, which process comprises a) suctioning the aqueous slurry suspension comprising a blast medium and coating substance residues into a receiving tank by an air feed; b) diluting the suspension with water under vacuum in the receiving tank; c) feeding the diluted suspension by means of a pump into a settling tank, d) separating a solid materials portion of the suspension from the water by sedimentation, and e) recycling the separated water, wherein the suctioning of the aqueous slurry suspension into the receiving tank is conducted with a vacuums wherein, a pressure ratio of outside pressure to receiving tank pressure is 1:0.52 or more, whereby the aqueous suspension is diluted to a solid materials proportion of a maximum of about 10% by volume, and wherein the diluted suspension is fed continuously to the settling tank and overcomes a height differential of at least about 5 meters.