Process for acidizing and recycling lignin by using pulping black liquid
A technology of pulping black liquor and lignin, which is applied in the technical field of using pulping black liquor to acidify and recover lignin, which can solve the problems of unqualified discharge of wastewater, low pH value of wastewater, and high suspended solids, so as to achieve low and low suspended solids Waste liquid volume, low COD effect
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[0013] The present invention will be further explained below in conjunction with specific examples:
[0014] The example of the present invention adopts the following process:
[0015] 1. Acidification of thick black liquor:
[0016] Use a pump to add a certain amount of concentrated black liquor with a concentration of 60-80% to the reactor. When the amount of black liquor is half the volume of the reactor, stop adding the black liquor. Then slowly add 30-40% sulfuric acid solution to the black liquor, and while adding the sulfuric acid solution, turn on the agitator. When the pH value of the reaction mixture in the reaction kettle is in the range of 3-5, stop adding the sulfuric acid solution, and then Continue to stir for 5 minutes, that is, the entire acidification process is completed; the addition of sulfuric acid needs to be added slowly and completed within 20 minutes; the stirring speed is slow at the beginning and then fast, the stirring speed is 500 rpm for the first 15 m...
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