Burden preparation

Continuous sintering of fine ore and dusts. Burden preparation in tumbling drums. 

Solid particles that are entrained in the combustion air, settle in bins, which are part of the main suction duct and fine dust is removed in a dust collector. These solids are transported to the burden preparation plant and ultimately fed back to the sintering machine. Fig. 6.8-13 already includes two improvements. First, oversized pieces from the sinter crusher are recrushed in closed loop with a screen (not shown) and all screen fines are recirculated to provide a hearth layer, which protects the grate from excessive temperatures. Second, to achieve uniform bed depth across the grate, feed is placed onto the insulating hearth layer with a swinging conveyor and leveled with a roll feeder. 

The Iron Bla.stFurna.ee, The reduction of iron oxides by carbon in the iron (qv) blast furnace is the most important of all extractive processes, and the cornerstone of all industrial economies. Better understanding of the reactions taking place within the furnace has made possible a more efficient operation through better preparation of the burden, higher blast temperature, and sometimes increased pressure. Furnace capacity has doubled since the 1800s, whereas coke consumption has been reduced by about half The ratio of coke to iron produced on a per weight basis is ca 0.5 to 1. 

The reactivity and product selectivity increase as dispersing agents were introduced. Simultaneously, a higher silicon conversion was also obtained. A higher silicon conversion will decrease the burden of waste disposal. Therefore, this study provides a convenient and economical way for the preparation of highly effective CuCl catalyst that can be used in practical production using the direct process. 

Lead-containing ceramic ware used in food preparation has also been associated with childhood lead exposure in children of Hispanic ethnicity in San Diego County, California. One study (Gersberg et al. 1997) used the IEUBK to determine that dietary lead exposure from beans prepared in Mexican ceramic bean pots may account for a major fraction of blood lead burden in children whose families use such ceramic ware. 

Vaccination of lambs with a contortin-enriched preparation gave a mean reduction in worm burdens of 78% (Table 13.1) (Munn et al., 1987). This result was particularly significant because it showed that proteins expressed on the surface of the gut, albeit from a blood-feeding nematode, could induce high levels of protective immunity when used as an immunogen. These proteins are not normally accessible to the host immune system during the course of infection they are termed hidden or concealed antigens and the immunity conferred by them is described as artificial immunity. 

When high-specific-activity, non-colloidal preparations are administered (a) they are partitioned characteristically between liver and bone (b) in rodents the rate of loss of the liver burden is high (halftime = 6.5 to 10.8 d) (Durbin, 1973) (c) the spleen content is low and (d) autoradiographs show uniform distribution in hepatic cells rather than of phagocytosis of radioactive particles in the reticuloendothelial cells of the liver, spleen, and bone marrow, and there is deposition on bone surfaces. 

The effective pretreatments for enzymatic hydrolysis of cellulose in hardwoods and agricultural residues have been developed over the past 90 years and new or improved ones are still being developed. The initial impetus for pretreatment research was the expansion of a feed base for ruminants (i.e., cattle and sheep). The concentration of pretreatment research on animal feed preparation placed an additional burden on researchers, because the product must be not only fully convertible to animal live-weight, but also nontoxic and palatable. Early feeding trials of pretreated fine sawdust to cattle produced very dismal results (55). This may be the reason, besides the... 

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