Reference

Modification of hydroxyethyl cellulose fibers by crosslinking

Modification of hydroxyethyl cellulose fibers by crosslinking. Pastyr, Jan; Kuniak, Ludovit (Chem. Ustav, SAV, Bratislava, Czech.). Chem. Vlakna, 27(5), 308-12 (Slovak) 1977. CODEN: CMVLA8. ISSN: 0528-9432. DOCUMENT TYPE: Journal CA Section: 39 (Textiles) The physicomech. properties of hydroxyethylcellulose [9004-62-0] fibers are improved and the secondary swelling in H2O is decreased on crosslinking with Depremol G [1854-26-8] in the presence ofAl(NO3)3 [13473-90-0] as catalyst.

Preparation of rare earth element solutions for extraction

Preparation of rare earth element solutions for extraction. Lebedev, V. N.; Rudenko, A. V.; Uklein, G. I. (USSR). Fiz.-Khim. Osn. Redkomet. Syr'ya, 104-7. 13473-90-0 and 7440-21-3 are cas registry numbers. These chemicals are also mentioned in this article. Edited by: Kamenskaya, L. A. Akad. Nauk SSSR, Kol'sk. Fil.: Apatity, USSR. (Russian) 1983. CODEN: 50OUAR. DOCUMENT TYPE: Conference CA Section: 54 (Extractive Metallurgy) Removal of Si by pptn. was investigated after HNO3 dissoln. of carbamate ores contg. lanthanide oxide 48, CaO 5.8, SrO 2.9, ThO2 0.8, and SiO2 2.53%. Ore drying and calcination at 500° did not decrease the transfer of Si into soln. but lowered the recovery of rare-earth metals. Acid solns. were neutralized to pH 4 for Th sepn. and contained 0.4-1.6 g SiO2/L. Pptn. of SiO2 was promoted by the addn. of Al(NO3)3 and prior boiling to give 0.02-0.2 g SiO2/L. Further removal of SiO2 was possible by partial pptn. of rare earth metals. .