Detail of "25549-16-0"

Reference

Removal of mercury from waste water

Removal of mercury from waste water. Fenchel, Dieter; Scjmidt, Werner; Pfueller, Peter (Hoechst A.-G., Ger.). Ger. Offen. DE 2555693 23 Jun 1977, 18 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C02C005-02. APPLICATION: DE 75-2555693 11 Dec 1975. DOCUMENT TYPE: Patent CA Section: 60 (Sewage and Wastes) Section cross-reference(s): 49 Hg is removed from wastewater by extn. with water-insol. trialkylamines, e.g., triisooctylamine [25549-16-0] or triisotridecyl amine [35723-83-2], dissolved in petroleum, isodecanol, and/or xylene to sep. the Hg complex in the org. phase. The extn. is carried out in the presence of a large excess of Cl- which supresses the dissocn. of HgCl2. The pH of the soln. is <3; this prevents the formation of colloidal Fe(OH)3 and Al(OH)3. In the presence of a large amt. of Fe3+ the wastewater is treated with HNO3, H2SO4, or bisulfite soln. When the Hg concn. in the org. phase is >10 g/L, an anolyte soln. contg. 250-300 g NaCl and NaOH/L is added to prevent the formation of HgO. The regeneration is carried out at 50-100.degree.; the Na2HgCl4 complex can be returned to the electrolysis cells. Only a portion of the Hg complex is withdrawn. The first cycle removes 99% of Hg and the second cycle decreases it to <0.001 mg/L.

Separating metal constituents from ocean floor nodules

Separating metal constituents from ocean floor nodules. Cardwell, Paul H.; Kane, William S. (Deepsea Ventures, Inc., USA). U.S. US 4042664 16 Aug 1977, 27 pp. Cont. of U.S. 3,950,486. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C01G003-04. NCL: 423024000. APPLICATION: US 70-40564 26 May 1970. DOCUMENT TYPE: Patent CA Section: 54 (Extractive Metallurgy) Mn, Co, Cu, Fe, and Ni are recovered from nodules by chlorination leaching and solvent extn. Thus nodules contg. Mn 20, Fe 6.5, Ni 0.88, Cu 0.55, and Co 0.12 wt % were ground to <100 mesh and heated to 500.degree.. HCl(g) was passed through the powder for 2 h, and the crucible was flushed for 15 min with water vapor-satd. air at 300.degree.. The powder was then leached with aq. HCl at pH 3.5. The amts. of metals dissolved from the nodules were Mn 79, Fe 0, Ni 84, Cu 70, and Co 90%. The leach liquor was extd. with LIX-64N [39453-37-7] to recover the Cu, the pH was adjusted to 4.2 and the Ni + Co was extd. with 10 vol.% 7-[3-(5,5,7,7-tetramethyl-1-octenyl)]-8-hydroxyquinoline [29171-27-5], and the Co was sepd. from the Ni by extn. with triisooctylamine [25549-16-0]. The Mn was recovered from the raffinate by electrolysis.