Reclaimator process, mechanical

Allowable when the pan, dry digestion, mechanical reclaimed processes are integrated with a wet digestion reclaimed rubber process. 

The significant reclaim processes in use in 1974 were the digester process, heater process, and mechanical processes [3], But there were at that time numerous variations and combinations of these. All have similar finishing steps. The reclaim is usually further compounded, refined on tight mills, and strained to remove foreign solids. 

The reclaimator process is more attractive than the above processes. The reclaimator is essentially a high-pressure extruder that devulcanizes fiber-free rubber continuously. Ground scrap is mechanically treated in hammer mills to remove the textile material, mixed with reclaiming oils and other materials, and then fed into the reclaimator. High pressure and shear between the rubber mixture and the extruder barrel walls effectively reclaim the rubber mixture. Devulcanization occurs at 175-205°C in a few minutes and turns the rubber into reclaim that issues from the machine continuously. The whole regeneration, which is a dry process, may be completed in about 30 min. 

A mechanical or reclaimator process (LaGrone, 1986 Szilard, 1973 Klingensmith, 1991 Leyden 1991) has been used for the continuous reclaiming of whole tire scrap. Fine mbber crumb (typically 30 mesh) mixed with various reclaiming oils is subjected to high temperature with intense mechanical working in a modified extmder for reclaiming the mbber scrap. 

A mechanical or reclaimator process [25, 32-34] has been used for the continuous reclaiming of whole tire scrap. Fine rubber crumb (typically 30... 

Acids and alkaUes were used to decompose the fiber to cellulose. The alkaU digester process, developed in 1899, is stiU used. Fiber glass reinforcement must be removed mechanically before the mbber can be reclaimed. A highly efficient method involves hammer mills and reel beaters to separate the fiber from the mbber an air current subsequentiy drives off the fiber. 

Additionally, amino acids may be reclaimed as dipeptides. The transport mechanisms for dipeptides are less specific than those for individual amino acids but require the dipeptide to carry a net positive charge so there is cotransport of protons, rather than of Na+ as for free amino acids. A potential advantage of dipeptide transport process is the favourable cell-lumen concentration gradient, which exists for peptides compared with free amino acids. 

Ground mbber has replaced reclaim in many tire applications including treads, carcasses, innerliners, subtreads, and bead components. It is also used in mechanical goods, footwear, solid tires, mats, and retreads. Cryogenically and wet-ground mbbers which are of smaller particle size can be used at moderately bigb levels and still allow compounds to be processible. 

Blends of PC with ABS or ABS/HIPS can be prepared by direct mixing for the reclaimed materials, i.e., blending without the need of sorting before. It has been demonstrated that these mixtures can be easily processed. Furthermore, the mixtures show acceptable mechanical properties (40). 

When plasma HCOJ concentration increases above 28 mmol/L, the capacity of the proximal and distal tubules to reclaim is exceeded, and HCOf is excreted in the urine. The process of bicarbonate reclamation is enhanced in acidosis (and decreased in alkalosis), most likely as a result of increased Na -H exchange. In this way, the kidneys in acidosis or alkalosis support the other compensatory mechanisms to restore the normal cHC03/cdC02 ratio. Type II RTA is a decreased ability to reabsorb HCO3 in the proximal tubules, leading to a decrease in blood pH. 

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