No abstract available

[en] A grinder for volume reduction of contaminated small containers is described. The design allows remote handling and easy dismanthing for cleaning or blade change

No abstract available

[en] In the continuation of the research work by BAM and the Commissariat a l'Energie Atomique (CEA), France, a study was made of the increased risk in regard to low-probability accidents, involving small, type B packages. An evaluation was made of the increased risk when small, type B packages are involved with a low-probability accident - one that involves both crush forces and exposure to a hydrocarbon fire. 3 references, 3 figures

[en] The test series described in this paper has shown that the proposed dynamic crush test or the alternate static crush test result in significantly greater packaging deformation than occurs when the regulatory 9 meter drop test is performed on lightweight, low density, Type B packagings. Furthermore, when the test results from the current program are compared with test results from an accident simulating test of a truck/trailer system carrying such lightweight packagings, the proposed dynamic crush test or the alternate static crush test both appear to provide a crush environment similar to that which can be expected in transport accidents, whereas the 9 meter drop test does not appear to simulate this environment. The energy absorbed by the packaging under the proposed dynamic crush test is independent of the packaging mass and can be significantly greater than the energy the packaging must absorb during a 9 meter drop test. The deformations produced in the 310 kN static crush test and the proposed dynamic crush test are very similar, and are generally greater than those experienced in the 9 meter drop test. The outer drum lid of the generic designs opened under these conditions, at times exposing the inner container. Such damage could lead to increased heating of the inner container during the following thermal test prescribed by regulations

[en] An industrial plant, situated in Niger, is described. This plant allows the crushing of 1500 metric tons of uranium per year in uranate form

[en] Many research studies have been conducted on the liberation of locked minerals using a crusher and comparing this device with the other devices. This paper reviews the liberation of middle coal by different methods of crushing force. In the Tabas coal washing plant, particles of 0.5-50 mm size are processed through the heavy media method (using 3 Tri-flo separators) and particles of 0-0.5 mm size are processed using the flotation method (using 6 column flotation cells). A Tri-flo separator with a diameter of 700 mm and the capacity of 120 tons per hour is used for the cleaning of 6-50 mm raw coal particles. The study was conducted using a laboratory jaw crusher and a cage mill with a specific comminution ratio, both crushing forces were analyzed with the same distribution and mechanism of production of fines. In this study, grading and washability characteristics of a representative sample of middle product were reviewed and the dimensions of the ash were measured for each section. Intermediate product crushing using a laboratory jaw crusher and an industrial cage mill were conducted at up to 5 mm size and 50 percent of final speed. The amount of coal released after each section grading was determined by a sinking and floating test for size +0.5 mm and release analysis and ash testing for smaller dimensions of -0.5, these tests were conducted for each section product dimension. The results indicated that utilizing a cage mill is more effective than a laboratory jaw crusher, resulting in 11-percent more yield with 12 ash. The rate of fines produced through the laboratory jaw crusher is less than the industrial cage mill.

No abstract available

[en] Natural resources have been serving the life of many civilizations, among these coals are of prime importance. Coal is the most important and abundant fossil fuel in India. It accounts for 55% of the country’s energy need. Coal will continue as the mainstay fuel for power generation. Previous researches has been made about the coal feed size and coal type had great influence on the crushing performance of the same jaw crusher and amount of fines generated from a particular coal depends not only upon coal friability but also on crusher type. Therefore, it necessitates crushing and grinding the coal for downstream process. In this paper the effect of crusher type and crusher discharge setting on washability characteristics of same crushed non-coking coal has been studied. Thus four different crushers were investigated at variable parameters like discharge settings, different capacities and feed openings. The experimental work conducted for all crushers with same feed size and HGI (Hardgrove Grindability Index). Based on the investigation the results indicate that the four crushers which has been involved for the experimental work shows that the variation in not only the product size distribution and also reduction ratio. Maximum breakage has been occurred at coarsest size fraction of irrespective of crusher type and discharge setting. (paper)

[en] We consider vacuum spacetimes with a crushing singularity. Under some scale-invariant curvature bounds, we relate the existence of Kasner-like regions to the asymptotics of spatial volume densities. (paper)