this list of indian inventions and discoveries details the inventions, scientific discoveries and contributions of india, including the ancient, classical and post-classical nations in the subcontinent historically referred to as india and the modern indian state. it ds from the whole cultural and technological history of india, during which architecture, astronomy, cartography, metallurgy .
silicosis is a form of occupational lung disease caused by inhalation of crystalline silica dust. it is marked by inflammation and scarring in the form of nodular lesions in the upper lobes of the lungs.it is a type of pneumoconiosis. silicosis particularly the acute form is characterized by shortness of breath, cough, fever, and cyanosis bluish skin . it may often be misdiagnosed as .
a wet grinder is a food preparation appliance used especially in indian cuisine for grinding food grains to produce a paste or batter.wet grinding is rare in western cuisine but common in indian cuisine. wet grinders are used to make pastes from grains and lentils and is used extensively in south indian cuisine for preparation of popular dishes such as dosa, idly, vada, appam and paniyaram.
the isamill is an energy-efficient mineral industry grinding mill that was jointly developed in the 1990s by mount isa mines limited and netzsch feinmahltechnik, a german manufacturer of bead mills. the isamill is primarily known for its ultrafine grinding applications in the mining industry, but is also being used as a more efficient means of coarse grinding. by the end of 2008, over 70% of the isamill’s installed capacity was for conventional regrinding or mainstream grinding .
the efficiency of the early stages of grinding in a ball mill is much greater than that for formation of ultra-fine particles, so ball mills operate most efficiently by making a coarse product, the fine fractions of this then being separated, and the coarse part being returned to the mill inlet. the proportion of the mill-exit material returned .
surface grinding. does this section need to be presented more as a summary, with most of the details residing in the main surface grinding article? wilhkar 21:16, 20 february 2010 utc wilhkar cylindrical grinding. should this section, on the process, refer to the main article, cylindrical grinder? that article is an equipment article. i linked .
a bench grinder is a benchtop type of grinding machine used to drive abrasive wheels. a pedestal grinder is a similar or larger version of grinder that is mounted on a pedestal, which may be bolted to the floor or may sit on rubber feet. these types of grinders are commonly used to hand grind various cutting tools and perform other rough grinding.
for comminution of finer particle size ranges 20mm > p 80 > 30 μm machines like the ball mill, vertical roller mill, hammer mill, roller press or high compression roller mill, vibration mill, jet mill and others are used. for yet finer grind sizes sometimes referred to as 'ultrafine grinding' , specialist mills such as the isamill are used.
comminution is the reduction of solid materials from one average particle size to a smaller average particle size, by crushing, grinding, cutting, vibrating, or other processes. in geology, it occurs naturally during faulting in the upper part of the earth's crust. in industry, it is an important unit operation in mineral processing, ceramics, electronics, and other fields, accomplished with .
the respirable fraction of lunar dusts may be toxic to humans. nasa has therefore determined that an exposure standard is necessary to limit the amount of respirable airborne lunar dusts to which astronauts will be exposed. the nominal toxicity that is expected from ordinary mineral dust may be increased for lunar dusts due to the large and chemically reactive surfaces of the dust grains.
shanghai clirik machinery co., ltd, located in pudong new area of shanghai, china, is a large professional manufacturer with import & export rights specializing in research, manufacture and sales of crushing machinery, mining equipment, and grinding machines, such as micro powder grinding mills, ultrafine mills, stone grinder mills, hammer crushers, jaw crushers and associated accessories.
titanium dioxide nanoparticles, also called ultrafine titanium dioxide or nanocrystalline titanium dioxide or microcrystalline titanium dioxide, are particles of titanium dioxide tio 2 with diameters less than 100 nm. ultrafine tio 2 is used in sunscreens due to its ability to block uv radiation while remaining transparent on the skin. it is in rutile crystal structure and coated with silica or/and alumina to prevent photocatalytic phenomena.
from 10 coarsest to 600 finest , determines the average physical size of the abrasive grains in the wheel. a larger grain will cut freely, allowing fast cutting but poor surface finish. ultra-fine grain sizes are for precision finish work. generally grain size of grinding wheel are 10-24 coarse ,30-60 medium ,80-200 fine and 220-600 very fine .
the concentrate is then treated at an isamill ultra fine grinding ufg mill at fimiston and then cyanidised, or trucked to the gidji processing plant, 20 kilometres north of kalgoorlie. at gidji, the concentrate is treated in ultrafine grinding ufg mills, and then subjected to cyanide extraction of gold.
a unifine mill is a single one-pass impact milling system which produces ultrafine-milled whole-grain wheat flour that requires no grain pre-treatment and no screening of the flour. like the grist or stone mills that had dominated the flour industry for centuries, the bran, germ, and endosperm elements of grain are processed into a nutritious whole wheat flour in one step.
gypsum and calcium carbonate are relatively soft minerals, and rapidly grind to ultra-fine particles. grinding aids are typically chemicals added at a rate of 0.01-0.03% that coat the newly formed surfaces of broken mineral particles and prevent re-agglomeration. they include 1,2-propanediol, acetic acid, triethanolamine and lignosulfonates.
the term 'energetically modified cement' abbreviated as 'emc' or 'emc cement' refers to a class of cementitious materials which have been produced using a special activation process. this process is entirely mechanical, as opposed to thermal, and is carried out by finely grinding the materials to increase binding capacity.