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Method for Clarifying Slimes.

Authors
Khalafalla-SE; Reimers-GW
Source
U S Pat 4 295 971 1981 Oct; :
Link
NIOSHTIC No.
10006737
Abstract
Slimes and other wastewaters containing negatively charged particles are clarified by flocculating with positively charged dodecylamine stabilized magnetite colloid. The flocs are separated by gravity or by the use of a magnetic field. For example, fecl2.4H2o and fecl3.6H2o solutions were combined to give a fe(III)-fe(II) molar ratio of 1.3:1, Nh4oh was added as precipitant, and the resulting precipitate was settled on a permanent magnet, separated, washed with nh4oh, settled on a permanent magnet, and decanted. Dodecylamine was then added to the precipitate and the mixture adjusted to a volume such that the composition had a saturation magnetization of 5 g. The dodecylamine content was 25 pct based on the magnetite. When 1.0 Ml of the composition was added to 100 ml of iron oxide slimes having a solids content of 0.035 pct and a turbidity reading of 59 nephelometric turbidity units (ntu), the ntu reading of the resultant supernatant was 5.5.
Publication Date
19811001
Document Type
PA;
Fiscal Year
1982
NTIS Accession No.
NTIS Price
Identifying No.
P 31-81
NIOSH Division
TCRC;
Source Name
U.S. Pat. 4,295,971, Oct. 20, 1981; Chem. Abstr. 95:191,956K
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