Arizona weekly citizen., 1885-10-10
The Rickard Patent Oxldizlns.

AI AAC AC" e-1~ N-SE - ores (pyritous with about l5 per cent suIphur) of the Servisp Copper and Iron Co, the ordinary reverberatory having been found too slow and eX- pensive:
 After a successful run of some months, and the difficulties of the op- eratiou had been surmounted, the fol- loving vote of thanks was passed st 6 board meeting of the company and for wAr1ed to the inventor.
 MaldAnpek, Servis, July 10, 1876.
 WI RickArd, Esq.-Desr Sr: 1 am directed by the Board of tue Servisu Copper aud iron Co. to convey their thanks to you for your skill and energy m bringing into successful operation a process for the re iuction of the ores of | Maidanpek. l remain, dear sir, yours sincerly.
 BRESroS SYMoSs, Resident Director
 The grand defect in the old reverber- story consists in the time required to oX. ldize or burn of the sulphur, the air or oxidIEIng agent having to pass through the fireplace Eheie It is oeprlved of The greater part of its oxygen before It can attack the sulphur: and the amount oi hard labor required to rake and turn over the charge from time to tune iu order to expcse fresh surfaces to the ox' dizlng action of the air.
 Now, ss sulphur requires its own weight of oxygen, and iron SO per cent to convert the former into suIphnrous acid gas, and the latter into peroIide | it follows that a minimum of lSO Del cent of oxy gen must be introduced be fore these results can be obtained; aud as 8 cubic foot of air contains but one fourth of an ounce of oxygen, II IS ob vious that an enormous volume of ali must pass through the furnace before perfect calcIustIon can be secured: snC as only the excess of air passing througt the ignited and deoxidizlng fuel, as ap piled ID the ordinary reyerbsratory fur mace, is available, she operation Is ne cessarily slow, tedious, expensive snc unsatisfactory in the extreme.
 Thls difficulty has been comp!etel! overcome ID the "Rickard" furnace b, supplying 6 strong current of pure, ho ar (in addition to that passing through the tire-place) which burns of the sui phur with great rspidIty, and At th' same tune, by mesas of the force wiif winch 1t Is injected, keeps the charg, | in m tiun, presenting con inuslly fresf surfaces for oxidation snd thereby dis pensing (except m dischsrging) with the expensive and laborious process of rsk ing, so indispensable in the old rever beratory.
 This hot air is supplied without any additional cost for fuel. from fan ol any other good blower, and brought nI | to the temperature Of the furnace b. passing 1t through the fire bridge and | tiues bordering on the hearth tiil Il reaches its discharge outlet ID the | throat, where It encounters the powder | cd ore as 1t IS continuously introduced At the ra,e Of 30 1bs per minute. or ], ,oJ1 fbs per hour (more or less, according tI the amount of sulphur to be got rId of by means of a screw working n an ex ternal hopper, the amount of ore iLt.o duced being regulated by the 'peed oi the screw.
 The oxygen of this heated sir. uncon tsminaied by the products of combns ton thus introduced m excess of the re | quirements of the sulphur and iron, ID stantly attacks the finely divided sul | phuretted ore presented to It, and car ries of the sulphur as sulphurOus sciC gas, the lighter portions of the ore be jag carri-l by the force of the blast intS the upper hearths of the furnace and from thence to numerous dust chamber prepared for it's reception, the numbe of which can be regulated by the char acter Of the ore to be operated on. { little water sprinkled into the last on, prevent any loss through the chimney The ore collected in these chambers I the most thoroughly roasted, comin, almost, If not quite free from sulphur or "sVeet," ss II IS technically termed Ten to 3O per cent of the ore will hn' its way into these chambers. Thus on frequent objection. viz: loss of dust l made s prominently successful feature o this new arrangement.
 The heavier portion falls on the bot tom hearth, where it is attacked by sup plementary blssts of hot air from tns side fiues and fire bridge, winch keep tt m constant motion and prevents sg s!utinstion while the sulphur is bein, carried of.
 As the charge is ready for discharg ing every half hour, there is never nor shan about half a ton ou the hesrths R ! time, thus sfording room enough for | OA cL consequent oxidation. The discharge l effected in the customary manner, b raking through opening from one leve to another.
 A high degree of heat is thus devel oped by the rapid combustion of tn ! s1iphur and iron (which is no. ayailabl by the slow combustion of the old rev erberatoTyl and thereby a very consid ' IT ..H NNn..l |, ! effected, the operation RpproximRting m fact, to that of the "Hollwey" patent
 by which, under certsin conditions, tn
 sulphur and iron of She ore or matte ar the only fuels used. This besutifu
 process has. after many failures, bee
 recently brought to 6 successful issu
 at Parrot Copper Works" Butte. Mon tane, in connection with the Besseme converter. The large amount of oxy
 zen thrown ID by tbe blower also burn up every atom of csrbonsceons fuel use,
 in the fire place. IL IS claimed that m loss vf fuel can possibly take place, tb
 extensive dust chambers utilizing al
 waste heat before 1t reaches the chimney
 In practice it was found that two and
 half cords of wood was sufficient to cal cine 50 tons of ore with b per cent sul | puuE cNtttuctr lu <f uOuAc. Speed economy and efficiency havini
 been the objects Jn view, everything II the way of complicated machinery hs
 been carefully avoided, aud old ideas 0
 proved success retained ss far as pos -ible, the furnace being, iu fsct, DOthini
 more than 6 modified reverberator.
 with blast and dust chambers 90 sf range1 as to produce the maximum chemical results with minimum eI pe1diture O. fuel and labor.
 The advantages derived from its us
 may be seen in a comparison of Its Te suits with those of the common reveI beratory at present m use at some O our largest copper reduction works
 The reverberators burns three and
 half cords of wood n 2i hours. at S4
 cOrd-Sl4 Lahor. four men, at s3-Sl2 or, m all, S26, and cslcines 10 tons im perfectly ueRving 10 to l5 per cent sul phur bebinJ)-S26O per ton,
 The Rick, I'd" will burn but two sn' half cords of WOO i-Sl0. Labor, fou
 men at S3 SIP, or S22 ID all. and cal cines 70 tons periectly-sl 20 per ton being a direct saving of $40 per ton in addition to the gain effected in th, production ot a higher grade of matt or black copper, which may be es.imat