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Method for separating lignin from black liquor, a lignin product, and use of a lignin product for the production of fuels or materials
Method for separating lignin from black liquor, a lignin product, and use of a lignin product for the production of fuels or materials
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机译:从黑液,木质素产物中分离木质素的方法以及木质素产物用于生产燃料或材料的用途
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摘要
The method is for controlling a sodium and sulphur balance of a pulp mill while separating lignin from black liquor. Lignin is precipitated by using an acid followed by filtration. The lignin filter cake thus obtained is re-suspended in acidic liquid and dewatered to form a second cake. The filtrate obtained after dewatering of the second cake is returned for washing and suspension of the first cake. Sodium sulphate-rich ESP (electrostatic precipitator) dust produced in the recovery boiler is used in the washing of the precipitated lignin cake.
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