D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/36.3
D21C 3/02 (2006.01) D21C 11/00 (2006.01)
Patent
CA 1185408
A method of recovering chemicals and heat in sulphate spent liquor by means of A1(OH)3 or TiO2.n.H2O circulation and gasification of the waste liquor Abstract of the Disclosure The invention relates to a method of recovering chemicals and heat in sulphate spent liquor, wherein evaporated black liquor is granulated by means of circulated A1(OH)3 and NaA102 or TiO2.n.H2O and Na2TiO3, whereafter the granules are fed into a spent liquor gasifier where the temperature is from 700 to 1250°C. The granules which do not contain carbon, organic matter or sulphur are discharged from the gasifier, cooled with air and crushed, whereafter a part of the sodium aluminate or sodium titanate formed, if desired, is circulated to granulation and the remainder is dissolved in water. Hereby either NaOH and TiO2.n.H2O is formed which is precipitated or recirculated, or, when using A1(OH)3 circulation, an alkaline aluminate solution which can be directly used as absorption solution for H2S or cooking liquor in sulphate cooking. A1(OH)3 can also be precipitated from the solution and recirculated to granulation, whereby the remaining mother liquor mainly containing Na2CO3 is passed to causticizing. The gas mixture obtained from the gasification of spent liquor is cooled, whereafter H2S is absorbed from the gas into the NaOH solution or directly into the alkaline aluminate solution. The obtained solution is passed to the preparation of cooking liquor, and the flue gas is burned.
406445
Johansson Allan
Tanner Teemu
Hewson Donald E.
Johansson Allan
Tanner Teemu
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