Reference

Filtration of a Hanford site tank 241-AN-102 waste sample with alternate Sr/TRU precipitation conditions at bench and pilot scales

Filtration of a Hanford site tank 241-AN-102 waste sample with alternate Sr/TRU precipitation conditions at bench and pilot scales. Duignan, Mark R.; Steeper, Timothy J.; Williams, Michael R.; Townson, Paul S.; Abodishish, Hani A. (Westinghouse Savannah River Company, USA). AIChE Spring National Meeting, Conference Proceedings, New Orleans, LA, United States, Apr. 25-29, 2004, Meeting Date 2004, 983-997. American Institute of Chemical Engineers: New York, N. Y. ISBN: 0-8169-0942-3(English) 2004. CODEN: 69FQDB. DOCUMENT TYPE: Conference; (computer optical disk) CA Section: 71 (Nuclear Technology) Section cross-reference(s): 60, 61 As part of the River Protection Project at Hanford, Washington, Bechtel National, Inc. was contracted by the United States Department of Energy to design a Waste Treatment and Immobilization Plant to stabilize liq. radioactive waste. Because of its experience with radioactive waste stabilization, the Savannah River Technol. Center of the Westinghouse Savannah River Company is working with Bechtel National and Washington Group International, to help design and test certain parts of the Waste Treatment Plant. One part of the process is the sepn. of radioactive isotopes from the liq. waste by a pptn. reaction and cross-flow ultrafiltration. To better understand those combined processes an expt. was performed using a simulated radioactive waste, made to prototypically represent the chem. and phys. characteristics of a Hanford waste in tank 241-AN-102 and pptd. under prototypic conditions. The resultant slurry was then filtered using a cross-flow filter prototypic in porosity, length, and diam. to the plant design. An important aspect of filtration for waste treatment is the rate at which permeate is produced. There are many factors that affect filtration rate and one of the most difficult to obtain is the effect of particles in the waste streams. The Waste Treatment Plant will filter many waste streams, with varying concns. and types of dissolved and undissolved solids. An added complication is the need to ppt. org. complexants so they can be efficiently sepd. from the supernatant. Depending on how pptn. is performed, the newly created solids will add to the complicating factors that det. permeate flux rate. To study the effect of pptd. solids on filter flux a pilot-scale test was performed and 2 different mixing mechanisms were used for the pptn. reaction. A std. impeller-type mixer, which created a homogeneous mixt., and a pulse jet mixer, which created a less than homogeneous pptn. environment. Pulse jet mixers are included in the design of the Waste Treatment Plant because they have no moving parts, which is advantageous for radioactive operations as no maintenance is required. A pulse jet mixer uses alternate pulses of pressurized air and vacuum to mix tank contents. This pulse jet mixer was not expected to establish a homogeneous mixt. throughout the test tank, therefore, it was important to know its effect on filtration after a waste is pptd. This paper discusses the exptl. results of cross-flow filter flux after a simulated waste is pptd. 10101-50-5 and 7440-45-1 are just another two chemicals used in this study. under each of the 2 mixing methods. The main conclusion reached is that while the less than well mixed jet-pulsed waste gave a lower av. filter flux it may still be sufficiently large enough to meet plant requirements. .

Burning coal element capable of desulfurizing and de-dusting and saving coal in coal-burning process

All Rights Reserved. In this study， 10101-50-5 and 471-34-1 are also used. Burning coal element capable of desulfurizing and de-dusting and saving coal in coal-burning process. Xu, Risheng (Peop. Rep. China ). Faming Zhuanli Shenqing Gongkai Shuomingshu CN 1891798 A 10 Jan 2007,8pp. (Chinese). (People's Republic of China). CODEN: CNXXEV. APPLICATION: CN 2010-71283 29 Mar 2006. DOCUMENT TYPE: Patent CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) The title burning coal element consists of (by wt.%) Mg oxide 1.3, NaCl 66, Na permanganate 6, paraffin 2, K chlorate 5, KNO3 5, NaNO3 5, Mn dioxide 6, Ca carbonate 1.5, Co chloride 1, and is manufd. by mixing, grinding to 80 mesh powder, then packaging. Coal can be mixed with the burning coal element at 100 ton coal/1 ton burning coal element under doping with 6-12% Ca silicate and spraying 7% H2O. The burning coal element can be used as additive product for achieving coal-saving rate >20%. .