Method for preparing unbleached pulp from sugarcane bagasse

Abstract

The invention discloses a method for preparing unbleached pulp from sugarcane bagasse. The method comprises the following steps of firstly, feeding the sugarcane bagasse subjected to impurity removal into a digester, and counted by oven dry weight of the sugarcane bagasse, adding 0.8 to 1 percent of Na5P3O, 10.2 to 2.5 percent of Na2SO3, 1.5 to 2 percent of KOH and 0.2 to 0.3 percent of anthraquinone, and cooking at the temperature of 130 to 135DEG C for 55 to 60 minutes; secondly, feeding the cooked raw materials into a twin screw refining extruder for performing rubbing and spreading to obtain coarse pulp; thirdly, washing the coarse pulp to obtain sugarcane bagasse unbleached pulp. Compared with traditional alkaline method and sulfate method, the method disclosed by the invention has the advantages that the pulping yield can reach 65 to 70 percent, the average length of fibers is 1.26 micrometers, the length-width ratio is greater, the ratio of BOD (Biochemical Oxygen Demand) / COD (Chemical Oxygen Demand) in sludge can reach about 0.5, a biochemical process is extremely-easily generated, and the pulping cost can be saved by about one third.

Description

technical field [0001] The invention relates to a method for preparing natural color paste from bagasse. Background technique [0002] As the main source of sugar cane raw materials in my country, sugarcane has a large planting area every year. Taking 2014 as an example, the total output of sugarcane in my country reached 128.2 million tons, and the output of bagasse was about 29.486 million tons. Excluding the 22.409 million tons burned by the sugar factory's own boiler, the remaining bagasse was 7.077 million tons per year. Among them, 50% of the fibers can be used for papermaking, which means that 3.538 million tons of bagasse raw materials can be used for papermaking every year. However, the bagasse used for papermaking in my country is not satisfactory, only about 1 / 3 of the existing bagasse, and a lot of raw materials are wasted every year. Mainly due to the existing papermaking technology, the existing bagasse papermaking mostly uses the traditional alkali method an...

AI Technical Summary

Problems solved by technology

However, the bagasse used for papermaking in my country is not satisfactory, only about 1 / 3 of the existing bagasse, and a lot of raw materials are wasted every year

Mainly due to the existing papermaking technology, the existing bagasse papermaking mostly uses the traditional alkali method and the sulfate method. With this kind of technology, alkali recovery equipment must be installed, which requires large investment and high cost. The middle water is difficult to biochemically, which makes many enterprises daunting