FIELD: paper.
SUBSTANCE: method of cleaning ash of heat-recovery boiler of cellulose plant, used together with single-step or multi-step method of leaching ash, is characterised by that at least one calcium compound, most preferably, calcium oxide (CaO) and/or calcium hydroxide (Ca(OH)2) is used as an additive on one or more leaching stages. Liquid fraction, formed during leaching, is outside main cycle of chemical extraction preferably as a substitute of commercial sodium hydroxide at bleaching line of cellulose plant, and solid fraction may be mixed with stream of black liquor or subjected to additional processing in order to separate a calcium compound for recycling.
EFFECT: as a result ash is cleaned from a significant amount of carbonate that it contains.
7 cl, 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR COMPENSATING SODIUM LOSS AT PULP MILL, METHOD AND SYSTEM FOR PRODUCING BLEACHED PULP | 2020 |
|
RU2803238C2 |
| METHOD FOR CONTROLLING CHEMICAL BALANCE OF PULP MILL | 2018 |
|
RU2768230C2 |
| METHOD FOR MANUFACTURE OF PULP AND BLACK LYE RECYCLING | 2004 |
|
RU2348749C2 |
| METHOD OF LOWERING CHLORIDE CONTENT IN CHEMICAL REAGENT REGENERATION SYSTEM FOR PULPING | 1993 |
|
RU2095504C1 |
| INCORPORATED SYSTEM OF KRAFT-PULP PLANT AND THERMOCHEMICAL TRANSFORMATION | 2015 |
|
RU2696962C2 |
| METHOD AND DEVICE FOR PROCESSING LIQUID FLOWS ON PULP MILL | 2013 |
|
RU2636560C2 |
| METHOD AND PLANT FOR PROCESSING OF CELLULOSE PLANT BLACK LIQUOR | 2010 |
|
RU2546514C2 |
| METHOD FOR UTILIZING LIGNIN SEPARATED FROM BLACK LIQUID AS LIME-KILN FUEL | 2015 |
|
RU2677946C2 |
| METHOD OF OBTAINING SODIUM HYDROXIDE FROM LIQUID WASTES OF FIBROUS MASS PRODUCTION | 2010 |
|
RU2550177C2 |
| METHOD FOR HANDLING SPENT WASH SOLUTION OF LIGNIN-RECOVERY PROCESS | 2015 |
|
RU2675454C2 |
