. Coke breeze briquetting. ressure. 105 ------ They united little effort at this temperature. Melting Point. The tar was placed in a pan and heatedslowly by the application of a bunsen thermometer was suspended in the liquid. Temp. Characteristics. 115 _-___- The pitch readily flowedbecoming a thick heavy liquid. 225 - - It became quite fluid and is approxim^-tely in its most liquified state. 250 It boils in much the same manner as water. 36 Investi,nation of TJaterlals Used. From these last results the follovringimportant points Trere I. As the tar only starts to sticko
. Coke breeze briquetting. ressure. 105 ------ They united little effort at this temperature. Melting Point. The tar was placed in a pan and heatedslowly by the application of a bunsen thermometer was suspended in the liquid. Temp. Characteristics. 115 _-___- The pitch readily flowedbecoming a thick heavy liquid. 225 - - It became quite fluid and is approxim^-tely in its most liquified state. 250 It boils in much the same manner as water. 36 Investi,nation of TJaterlals Used. From these last results the follovringimportant points Trere I. As the tar only starts to stickor adhere at 105 degrees no briquettesshould he made with the mixture below thistemperature. II. During the process of hot mixingthe temperature should range bet-reen 235and 350 degrees in order to have the mostfluid liquid to wor> ivith. III. At this temperature of manufactureall moisture originally in the fuel would beevciporated. If the coke breeze was ofsufficient fineness no preliminary drying7;ould be necessary. 37. Cast Iron Mould and Steel PlungerUsed in Briquetting. 38 INVESTIGATION FOR THE CORRECT COJilPRESSINGLOAD In order to design the machinery tobe used and the most economic-il briquetteto be made, the effect of loading must beknown. This is very important also for thequality of the briquettes. As the load isapplied there is a point reached where anyadditional force does not produce anyappreciable further compression. This pointis the object of the following test. In order to apply a known load uponan element of area a special apparatus wasmade. This consisted of a cast iron cylinderas is shown in the sketch with a wholethrough the center exactly one square inchin cross-section. A steel pistion was turnedto act as a plun^-er in this opening. 39 Correct Coppre3_3ing^ Load A lOfj mixture of cokebreeze and pitch was made. The coke breezewas ground in an electric grinder andpassed through a ten inhh sieve. It was thenweighed out, put in a pan, and heated to 250decre
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