EP0178009A1
Expired / Lapsed
EP
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Process for reconditioning contaminated soil
Assignee: Heidemij Realisatie BV
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Filing: 1985-09-25
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Granted: —
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Expires: 2005-09-25
Abstract
Abstract The invention relates to a process for reconditioning soil contaminated with cyanides, heavy metals, organic compounds and/or the like, comprising: a) the step wherein contaminants are separated from the contaminated soil by flotation; b) the step wherein the float is removed; and c) the step wherein the flotation residue is washed, and is characterized by: d) the step wherein contamination is freed from the flotation residue by hydrolysis, and/or the step wherein prior to the flotation step a, a soil fraction up to a predetermined particle dimension is separated by scalping. Preferably a mono-unsaturated fatty acid notably oleic acid is used as collector during flotation. Advantageously the flotation residue is washed in a number of subsequent groups of cyclones, each group consists of at least one cyclone.
Inventors
- 👤 Antonius Johannes Maria Broeders
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 10:27
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/001; B03D1/004; B03D1/008; B03D1/01; B03D1/011; B03D1/012; B09; B09C; B09C1/00; B09C1/02; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/006
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
61 words
Process for reconditioning soil contaminated with cyanides, heavy metals, organic compounds and/or the like, comprising: a. the step wherein contaminants are separated from the contaminated soil by flotation; b. the step wherein the float is removed; and c. the step wherein the flotation residue is washed, characterized hy: d. the step wherein contamination is freed from the flotation residue by hydrolysis.
Claim 2
Dependent Claim
61 words
Process for reconditioning soil contaminated with cyanides, heavy metals, organic compounds and/or the like, comprising: a. the step wherein contaminants are separated from the contaminated soil by flotation; b. the step wherein the float is removed; and c. the step wherein the flotation residue is washed, characterized hy: d. the step wherein contamination is freed from the flotation residue by hydrolysis.
Claim 3
Dependent Claim
13 words
Process as claimed in claim 1, characterized in that the float is thickened.
Claim 4
Dependent Claim
29 words
Process as claimed in claim 1 or 2, characterized in that prior to flotation step a, soil fraction up to a pre- determined particle dimension is separated by scalping.
Claim 5
Dependent Claim
21 words
Process as claimed in claim 3, characeterized in that said particle dimension lies between 100-50 µm, and is preferably 75 µm.
Claim 6
Dependent Claim
22 words
Process as claimed in claim 3 or 4, characterized in that the scalped fraction is added to the soil to be reconditioned.
Claim 7
Dependent Claim
15 words
Process as claimed in claim 3-5, characterized in that the scalped soil fraction is thickened.
Claim 8
Dependent Claim
51 words
Process as claimed in claims 1-6, characterized in that a mono-unsaturated fatty acid is used as collector during flotation, preferably the cis isomer of the fatty acid is used and more preferably the number of methylene (CH 2 ) groups on either side of the double carbon carbon bond is equal.
Claim 9
Dependent Claim
19 words
Process as claimed in claim 7, characterized in that the fatty acid is oleic acid (cis-8 heptadecane-1 carboxylic acid).
Claim 10
Dependent Claim
18 words
Proces as claimed in claims 1-8, characterized in that the pH of the flotation medium lies between 7-11.
Claim 11
Dependent Claim
29 words
Process as claimed in claims 7-9, characterized in that on the basis of up to 6 kg dry substance, preferably 100 g per ton of contaminated soil is used.
Claim 12
Dependent Claim
24 words
Process as claimed in claims 1-10, characterized in that a quartenary ammonium compound is also used as collector, preferably ethylhexadecyltrimethyl ammonium chloride is used.
Claim 13
Dependent Claim
41 words
Process as claimed in claims 7-11, characterized in that prior to the flotation step a using the mono-unsaturated fatty acid as collector, other contamination is separated from the soil in an additional flotation step at pH 7-9 using xanthates as collector.
Claim 14
Dependent Claim
31 words
Process as claimed in any of the preceeding claims, characterized by washing the flotation residue in a number of subsequent groups of cyclones, each group consists of at least one cyclone.
Claim 15
Dependent Claim
77 words
Process for reconditioning soil contaminated with cyanides, heavy metals, organic compounds and/or the like, comprising: a. the step wherein contaminants are separated out of the contaminated soil by flotation; b. the step wherein the float is removed; and c. the step wherein the flotation residue is washed, c. the step wherein the flotation residue is washed, characterized in that prior to the flotation step a, soil fraction up to a pre-determined particle dimension is separated by scalping.
Claim 16
Dependent Claim
77 words
Process for reconditioning soil contaminated with cyanides, heavy metals, organic compounds and/or the like, comprising: a. the step wherein contaminants are separated out of the contaminated soil by flotation; b. the step wherein the float is removed; and c. the step wherein the flotation residue is washed, c. the step wherein the flotation residue is washed, characterized in that prior to the flotation step a, soil fraction up to a pre-determined particle dimension is separated by scalping.
Claim 17
Dependent Claim
21 words
Process as claimed in claim 14, characterized in that said particle dimension lies between about 100-50µm, and is preferably 75 µm.
Claim 18
Dependent Claim
21 words
Process as claimed in claim 15, characterized in that the scalped soil fraction is added to the soil to be reconditioned.
Claim 19
Dependent Claim
70 words
Process for reconditioning soil contaminated with cyanided, heavy metals, organic compounds and/or the like, comprising: a. the step wherein contaminants are separated out of the contaminated soil by flotation; b. the step wherein the float is removed; and c. the step wherein the flotation residue is washed, characterized in that prior to the flotation step a, soil fraction up to a pre-determined particle dimension is separated and is preferably 75µm.
Claim 20
Dependent Claim
70 words
Process for reconditioning soil contaminated with cyanided, heavy metals, organic compounds and/or the like, comprising: a. the step wherein contaminants are separated out of the contaminated soil by flotation; b. the step wherein the float is removed; and c. the step wherein the flotation residue is washed, characterized in that prior to the flotation step a, soil fraction up to a pre-determined particle dimension is separated and is preferably 75µm.
References Cited (Backward Citations)
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Cited
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US4336136A
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NL8203415A
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