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Jordanhigh quality medium diabasebriquette making machine

Jordanhigh quality medium diabasebriquette making machine

An average production rate in common material (no rock) from an equipment performance handbook might be 150 bank cubic meters per hour for a 300 hp power-shift tractor with ripper. The tractor cost is $80/hr. The rate of excavation would be P = (150 m3/hr)/(2100 m3/km) = .07 km/hr UC = 80/.07 = $1143/km If the earthwork is not being placed or sidecast within 50 meters of the cut, the production rate for pushing the material to the placement location must be made. Scrapers or excavators and dump trucks may be used. Excavation rates in rock vary with the size of job, hardness of rock and other local conditions. Often there is a local market price for blasting. Estimates of blasting production can be made by knowing the size of equipment and the type of job. For example, a 10 cm track-mounted drill and 25 cubic meter per minute air-compressor may prepare 40 cubic meters per hour for small, shallow blasts and 140 cubic meters per hour for larger, deeper blasts including quarry development to produce rock surfacing. A major cost will be explosives. For example, 0.8 kg of explosive such as Tovex might be used per cubic meter of rock at a cost of approximately $2 per kg.4.5 Finish Grading Finish grading of the subgrade can be estimated by determining the number of passes a grader must make for a certain width subgrade and the speed of the grader. This number can be converted to the number of hours per hectare of subgrade. For example, a 120 hp grader may require about 10 hours of productive machine time without delays per hectare of subgrade or 0.1 hectares per hour. The production rate for final grading of a 6.0 meter subgrade would then be, P = (0.1 ha/hr)/(0.6 ha/km) = .17 km/hr If the grader cost is $30/hr, the unit cost of grading is UC = 30/.17 = $176/km Similarly, the rate of pulling ditches per kilometer can be estimated.4.6 Surfacing Surfacing costs are a function of the type of surfacing material, the quantity of surfacing material per square meter, and the length of haul. Local information is the best guide in constructing surfacing costs due to the wide range of conditions that can be encountered. Natural gravel from streams may require only loading with front-end loaders directly to dump trucks, transporting, spreading, and may or may not be compacted. Laterite may be ripped by crawler tractor, loaded by front-end loader, transported, spread and grid-rolled with a sheeps-foot roller to produce a sealed running surface. Rock may have to be blasted, loaded into one or more crusher(s), stockpiled, reloaded, transported, spread, and compacted. The costs for each of these operations can be developed by estimating the equipment production rates and machine rates. EXAMPLE: A relatively complex surfacing operation requires developing a 20,000 cubic meter solid rock source (26,400 cubic meters in the road prism) to surface 26.4 km of road including shooting and crushing rock, loading, transporting, and spreading rock as follows. To open up rock source, use data from clearing and common excavation: (a) To clear and excavate to rock: Equipment Machine Hours Machine Rate Cost Tractor 27 72.00 1944.00 Cost per cubic meter solid rock = $0.10 (b) To drill and blast at a production rate of 140 cubic meters per hour Equipment Machine Hours Machine Rate Cost Drills 1.0 60.00 60.00 Compressor 1.0 55.00 55.00 Explosives 0.8 kg $2.0/kg 140 m3 224.00 339.00 Cost per cubic meter solid rock = $2.42 (c) To crush 225 tons per hour (2.6 tons/solid cubic meter): Equipment Machine Hours Machine Rate Cost Tractor 0.5 72.00 36.00 Loader 1.0 90.00 90.00 Crusher 1.0 90.00 90.00 Stacker 1.0 15.00 15.00 Generator 1.0 20.00 20.00 251.00 Cost per cubic meter solid rock = $2.90 (d) To load, transport, spread 20,000 cubic meters of rock. 1 truck 3 loads/hr 20 tons/ld m3/2.6 ton = 23 m3/hr If 4 trucks are used: Equipment Machine Hours Machine Rate Cost 4 trucks 870 50.00 43,500 Loader 218 90.00 19,600 Tractor 218 72.00 15,700 Grader 30 60.00 1,800 80,600 Cost per cubic meter solid rock = $4.03 The total unit cost of per cubic meter of rock spread on the road is Activity $/m3solid $/m3prism $/km Develop pit 0.10 0.08 74 Drill and blast 2.42 1.83 1833 Crush 2.90 2.20 2197 Load, transport, and spread 4.03 3.05 3053 9.45 7.16 7157 Equipment balancing plays an important role in obtaining the minimum cost per cubic meter for surfacing. In some areas, market prices for various types of surfacing may exist and tradeoffs between aggregate cost, aggregate quality, and hauling distance will have to be evaluated. Since surfacing is often expensive, a surveying crew is sometimes added to stake and monitor the surfacing operation.4.7 Drainage Drainage costs vary widely with the type of drainage being installed. The costs of drainage dips (water bars), culverts, and bridges are often expressed as a cost per lineal foot which can then be easily applied in road estimating. Local values for cost per lineal foot for culverts and different types of bridges are generally available. If not, constructed costs can be made by using time study data. EXAMPLE: A 45 cm culvert, 10 meters long, is being installed. Experience indicates that a small backhoe and operator, and two laborers can install 3 culverts per day. The culvert crew uses a flat-bed truck to transport themselves and the pipe each day. To install 3 culverts: Equipment Machine Hours Machine Rate Cost Backhoe 6 60.00 360.00 Truck 9 12.00 108.88 Pipe Cost 30 meters $15/meter 450.00 918.00 Cost per lineal meter of culvert = $30.60 per meter Alternatively the cost could be stated as $306 per culvert or if there were an average of 4 culverts per km, then $1224 per km

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low price environmentalgypsum briquetting plant in Mardel

low price environmentalgypsum briquetting plant in Mardel

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It is the purpose of this report, as an appendix to the report of the Assessment Team, to review and to bring modern developments in environmentally-acceptable, whole-coal-based briquettes to the attention of both the researchers in this field and the concerned government authorities in the Kyrgyz Republic. The briquette manufacturing technology, illustrated in part B of this appemdix, and the estimates of costs are guidance for work which must be done under the technical, economic, and commercial conditions which prevail in the Kyrgyz Republic

Growth rates and immunocompetence have been shown to be depressed in cattle with excitable temperaments (Voisinet et al., 1997; Burdick et al., 2011). Changes in both intake (Caf et al., 2011b) and efficiency (Petherick et al., 2002) have been implicated as contributors to such responses. Receiving stress is associated with decreased intake and is likely to compromise ruminal function (Loerch and Fluharty, 1999). As a result, it is important to ensure adequate RDP intake in receiving cattle. If receiving stress is differentially expressed in animals from different temperament groups, it is possible that these groups will respond differently to RDP supply. Furthermore, animals' behavior may be related to gut microbial populations (Bercik et al., 2011). In ruminants, passage rate is a large determinant of the microbial population in the gut. Varied intake among temperament groups would be expected to correlate to varied passage rate and thus to potential variation in gut microbial populations. Because of the potential for differences in intake, growth rate, and gut microbial populations, it is reasonable to assume that differences in temperament among receiving cattle may be associated with differences in RDP requirements

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Mexico City highend medium copper mine briquette making

Mexico City highend medium copper mine briquette making

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where db.max is the maximum size of feed (mm); is compression strength (MPa); E is modulus of elasticity (MPa); b is density of material of balls (kg/m3); D is inner diameter of the mill body (m)

Feedstock solution is pumped into the atomizer at a controllable rate. Keeping the atomization pressure constant, there is an increase in the droplet size with increasing feed flow rates. This is easily understandable bearing in mind that the nozzle would have the same energy amount to spend in the atomization process of higher feeding volumes. Thus, the droplet fissions are minimized, provoking a small reduction of its size [2]

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Crushers are machines that use a rigid surface to compress and break large rocks into smaller rocks. They come in many varieties, and a summary of different crusher types is provided in Table

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