GB190405712A - Improvements in or relating to the Manufacture of Artificial Asphalt or the like Composition - Google Patents

Abstract

5712. Shedlock, J. J. March 8. Moving-stirrer apparatus.-Relates to the manufacture of an asphalt for paving &c. Finely comminuted lime, in one or other of its forms, together with silica or similar material, is mixed with liquid tar or other suitable hydrocarbon in the proportion of about 3 to 1, and the mixture is then subjected in a divided state to the action of superheated steam or heated inert gas in an airtight chamber. The volatile constituents separate out and are drawn off. As shown, the lime is fed from the hopper A and the tar from the receptacle E on to a revolving cone C, from which they are removed by fixed scrapers F. Revolving scrapers H then feed them from the inner surface of the cone G on to a worm I, whence they fall, over a cone J on to the upper tray K of a series in the airtight chamber N. Gas or steam passes from the superheater 3 between, and sometimes into, the trays. The material is fed down through holes, preferably placed spirally in the trays, by means of revolving beaters L fitted by means of square holes in their ends to the shaft T. There may be more than one beater and one hole for each tray, and some of the extra beaters may have serrated lower edges to stir up the mass. The revolving scraper 0 forces the material out of the bottom through a hole Q, the shelf or other receptacle on to which it falls being so placed as to keep the chamber airtight The gases and volatile constituents pass away in to the condenser 6, from which condensed water and distillates pass out through pipes 7, 8, respectively. If steam is not used, the inert gases from the condenser may be taken round by pipes 11, 4 to the superheater 3, and used again. The steam or inert gases are at a temperature of about 300‹-500‹ F. Air forced through red-hot coke is sometimes employed.