US1156551A - Waste-sulfite-liquor save-all. - Google Patents

Description

J. C. POLLANZ.

WASTE SULFITE LIQUOR SAVE-ALL.

APPLICATION FILED MAR. 29. 1915.

1,156,551. Patented Oct. 12, 191.3.

WITNESSES: lNI/EIV TOR 72 I By 4%? m4 A TTOR/V Y JACOB C. POLLANZ, OF OREGON CITY, OREGON.

WASTE-SULFITE-LIQUOR SAVE-ALL.

Specification of 'Letters Patent.

Patented (lot. 12, 11915.

Application filed March 29, 1915. Serial No. 17,794.

continuous system of reclaiming these fibers that is simple and effective.

The drawing shows a longitudinal elevation of the apparatus.

When the cooking of the chips in a digester is completed, the cook is then blown off into the blow pits, which are large rectangular or circular tanks capable of holding the solid contents of the digester. These tanks have perforated bottoms and as the mass of liquor and cooked chips are blown into the pit, the liquor runs out through the bottom, but the sulfite is retained. This must be thoroughly washed to remove as much of the acid as possible. During these operations of blowing off and washing much fine sulfite fiber goes off in the drains with the waste sulfite liquor and is not recovered. When it is considered that for every ton of fiber produced there are approximately nine tons of waste liquor it will be readily seen that here is a promising field of reclamation, for eachgallon of waste liquor carries a percentage of sulfite fiber.

Referring to the drawing, 2 shows a part of the perforated bottom of the blowpit 1. v

The waste liquor and washings filter through this bottom and pass to the trough 3, which empties into the chamber 4. This chamber in its lower section contains the screen plates 5 and the endless chain with scrapers 9 thereon. At the bottom of this chamber and below the screen plates is the drain 6. The screen plates, which are out about .016, are arranged lengthwise and are about four feet long by sixteen or eighteen inches wide and form a long narrow strip of screening that all the waste liquor must pass through in order to reach the drain 6. The screen plates are placed on an incline, the edge of the first plate being close to the bottom'of the chamber and the last plate being about twelve inches up from the bottom, in a disof about fifteenfeet. Anendless chain with floats 9 passes over the sprocket wheels 7 and 8, and as the sulfite screenings accumulate on the plates 5, the floats on the endless chain, which travels quite slowly, scrape the screenings into the pocket 10. The floats and chain pull some of the waste liquor along with them, but the screen plates being on an incline this soon runs back and when the screenings reach the high point toward the sprocket 8, they cover the plate in a solid layer. As the screenings or recovered fiber drop into the pocket 10, another endless chain 12, with floats thereon, running over sprockets 11 and 13 and moving somewhat faster than the scraper chain, carries the accumulated screenings to an opening let in the side of the blowpit and dumps the fiber back therein.

The shafts carrying the sprocket wheels 8 and 11 are extended outside of the chamher 4: and the motive power is applied to 8. Two sprockets and a'chain on the outside connect 8 and 11 and thus when sprocket 8 is rotated in the proper direction, causing the floats 9 to scrape the screenings toward 10, the chain 12 is also driven at the same time and carries the screenings to the blowp1t.

The waste liquor robbed of its fiber goes through the screen plates 5 and thence is carried away by the drain 6. Thus it will be seen that the apparatus is continuous in its operation; the liquor that goes through the gratings in the bottom of the blowpit is thoroughly screened before it goes to waste down the drain 6 and without any further attention whatsoever the fibers are recovered and-carried back to the blowpit and thus returned to the system. Such a device in a seventy ton plant has been saving an average of over a ton of sulfite fiber daily.

Having thus described my invention, what I claim is,-

.l. In a save-all for waste sulfite liquor, the combination with a blow-pit, of a drain from the blow-pit bottom, a screeningv chamber, with flat screen plates arranged therein on an inclined plane, means for removing the fiber from the to of the screen plates, which consists of a moving endless chain with suitable floats attached thereto, an endless carrier to convey the screened fibers backto the blow-pit and a drain at the bottom of said screening chamber to carry off the waste liquor.

2. In a save-all for waste sulfite liquor, the

combination with several blow-pits, of drains from the bottom of each blow-pit, a screening chamber, With fiat screen plates arranged therein on an inclined. plane, means for scraping the deposited fiber from said scr'een plates, which consists of a moving endless chain with floats thereon, an endless carrier to convey the screening back to one of the blow-pits, and a drain at the bottom of said screen chamber to carry ofi' the Waste liquor.

3. In a save-all for Waste sulfite liquor, the combination with a blow-pit, of a drain from the bottom of the blow-pit, a screening chamber, means for scraping the fiber 01f the screen plates and a carrier to convey the fiber from the screening chamber.

4. In a save-all for waste sulfite liquor, the

combination of a drain from the blow-pit bottom, a screening chamber with screen plates therein arranged on an inclined plane, means for scraping the deposited fiber from the screen plates and a carrier to take the recovered fiber from the screen chamber.

5: The method ofreclaiming fibers from Waste sulfite liquor by a continuous system which consists of draining the Waste liquor from the blow-pit through a screen chamber and returning the recovered fiber to a blowpit.

JACOB C. POLLANZ-v Witnesses:

F. F. SULLIVAN, R. -H. HARRISON.

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