| 摘要 |
Method for recovering chemicals in conjunction with gasification of residual products from pulp production, the said gasification taking place under understoichiometric conditions, with formation of at least one phase of solid and/or molten material and at least one phase of combustible gaseous material. The principal gasification material supplied for gasification is a mixture of electric filter ash from a recovery boiler process and a support fuel in fluid form, which consists of one or more liquids from the group comprising sulphate soap, tall oil, turpentine or methanol, where the ratio between the electric filter ash and the support fuel is such that there are essentially equal quantities. By this means, it is possible to achieve a sufficiently high temperature to reduce the said sulphur-containing material. The invention means that a product liquid in the form of white liquor, which can be returned to the pulp process, can be obtained without intermediate causticization, while at the same time a considerable waste problem is solved and sodium and/or sulphur compounds are returned to the process. The invention also relates to an arrangement for mixing liquid support fuel with the electric filter ash. |
