Reference

Wastewater treatment by electrolysis

Wastewater treatment by electrolysis. Nakade, Kazuhiko; Narabe, Hiroshi (Mitsui Mining and Smelting Co., Ltd., Japan). Japan. Kokai JP 52008662 22 Jan 1977 Showa, 3 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C02C005-12. APPLICATION: JP 75-84669 10 Jul 1975. DOCUMENT TYPE: Patent CA Section: 60 (Sewage and Wastes) Section cross-reference(s): 48, 72 Na aluminate is added to a wastewater to form Al(OH)3, followed by electrolysis with an insol. anode to purify the wastewater. Thus, NaOH was added to pH 7.5 to an acidic wastewater contg. 1.0 ppm Zn and 10 ppm Ni, the wastewater was filtered, then 15 ppm Na aluminate [1302-42-7] was added to the filtrate, which was electrolyzed at pH 7.5 with a C anode and an Fe cathode to give an effluent contg. 0.8 ppm each of Zn and Ni.

Micro-texture of alumina and silicon carbide ceramics

Micro-texture of alumina and silicon carbide ceramics.Some chemicals with cas registry numbers like 1344-28-1 and 1302-74-5 are also used. Moser, Miklos (Kem. Technol. Tansz., Budapesti Musz. Egy., Budapest, Hung.). Epitoanyag, 28(10), 365-72 (Hungarian) 1976. CODEN: EPITAA. DOCUMENT TYPE: Journal CA Section: 57 (Ceramics) A suitable model was obtained for grinding wheels by bonding glass spheres with fluxes. Using 2-8% flux, only connecting bridges were formed between the particles, with no coating around them. For 10-28% flux, the size of bridges increased with a simultaneous increase of coating width. For >28% flux, the texture lost its regularity. The most frequent and rather harmful contaminant of electrocast corundum prepd. from industrial Al2O3 is Na aluminate (I) [1302-42-7] with an approx. formula Na1.5Al10.83O17 which is usually unevenly distributed in the corundum [1302-74-5] abrasive grains as proved by microprobe tests. The microhardness of I-rich parts is 20-30% lower as contrasted to I-free zones. Upon heating, Na2O vaporizes and I transforms into corundum. The harm caused by I can thus be eliminated by a high-temp. firing of the grinding wheels. .