Bay County past and present . n used in the dry kiln. Thetemperature of the brine in the settling tanks varies from forty tosixty degrees, according to the season of the year. In the pre-heatingtanks the temperature is raised to about 150°. This pre-heating isnot really necessary, but saves time in the next process. From the pre-heating tanks the brine is carried by pipes to thegrainer, another series of tanks where the temperature of the brineis raised to from 170° to 190°, the best being about 180°. The vaporin this part of the salt block is very dense, showing that the water isevaporating r
Bay County past and present . n used in the dry kiln. Thetemperature of the brine in the settling tanks varies from forty tosixty degrees, according to the season of the year. In the pre-heatingtanks the temperature is raised to about 150°. This pre-heating isnot really necessary, but saves time in the next process. From the pre-heating tanks the brine is carried by pipes to thegrainer, another series of tanks where the temperature of the brineis raised to from 170° to 190°, the best being about 180°. The vaporin this part of the salt block is very dense, showing that the water isevaporating rapidly. But it is necessary to take out only a part of thewater. While the brine is in these tanks the pure salt settles to thebottom. Machines called rakers then scrape the salt to the edge ofthe tank, where it drops into the conveyors or troughs, leaving theother chemicals, which are always present in the brine pumped out ofthe wells, in a solution called bittern water. This is passed through INDUSTRIAL DEVELOPMENT. Ill. S oo .b M 4_;i fl rrt 01 TJ P :3 H^ ;-i W) 0) a fl t3 rrl 1=1 bJO a bo t ^ o g m m 112 BAY COUNTY, PAST AND PRESENT. the bittern water tanks, where it is re-heated. More salt, this timeof a poorer grade, but suitable for certain uses, such as packing icecream, is raked out. The bittern water is emptied into tank cars andis shipped to chemical factories where bromide, calcium chloride, andother chemicals are taken from it to be used in the manufacture ofbaking soda, washing soda, and other products. It is said that theDow Chemical Company at Midland pumps brine from a depth ofabout 2,200 feet, and without making salt, proceeds to the manufactureof chemical materials. The pure salt that is raked into the conveyors is carried bymachinery to the stock or storage room, where it is dropped fromabove out of openings in the conveyors into large cone-shaped pilesonto the floor. By this time the salt is practically dry and is loaded bymeans of wheelbarrows into the
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Keywords: ., bookcentury1900, bookdecade1910, bookidbaycountypas, bookyear1918
