Recycle method of pulping effluent of wheat straw chemi-mechanical pulp

Abstract

The invention provides a recycle method of pulping effluent of wheat straw chemi-mechanical pulp, which comprises the following steps of (1) concentrating the pulping effluent of the wheat straw chemi-mechanical pulp to the mass concentration of 10 to 30% and standing until delamination; (2) regulating supernatant liquid to be alkalinity, and then stirring for 5 to 20 minutes in a water bath of 25 to 55 DEG C; (3) adding the mixture of functional monomers and catalysts in an hour after increasing the temperature of the water bath to 60 to 85 DEG C, uniformly stirring, and then regulating the pH value to neutrality to prepare a wet end additives of semi-chemical corrugated paper, wherein the mass ratio of the supernatant liquid to the functional monomers to the catalysts is 100: (20 to 45): (5 to 10); and (4) taking away lower sediments, mixing with an adhesive X at the temperature of 25 to 45 DEG and adding functional additives to prepare a laminating agent of the semi-chemical corrugated paper. The invention can ensure that the effluent is processed and then used as the wet end additive and the laminating agent of the semi-chemical corrugated paper, thereofre the effluent is fully utilized and resources are saved; and moreover the operation is simple and the cost is low.

Description

【Technical field】 [0001] The invention belongs to the field of energy saving and comprehensive resource utilization in the pulp and paper industry, in particular to a method for resource utilization of wheat straw chemical pulping waste liquid. 【Background technique】 [0002] The chemical-mechanical pulping process is a pulping method that uses light chemical treatment and mechanical refining to produce pulp. Compared with the traditional chemical pulp production process, the chemical treatment conditions for fiber raw materials in the chemical-mechanical pulp production process are relatively mild, such as the amount of chemicals used is less, the treatment temperature is lower and the treatment time is shorter, resulting in the remaining in the pulp. There are more components such as carbohydrates and lignin, and correspondingly less organic matter and residual chemicals dissolved in the pulping wastewater, so the pulping yield is higher, and the content of harmful substan...

AI Technical Summary

Problems solved by technology

[0005] In recent years, researchers at home and abroad have isolated hemicellulose from plant fiber raw materials or pulping waste liquid to modify it for surface sizing, beating process, and papermaking wet end addition, etc., and have achieved good expected results. Relatively important theoretical value, but in practical application, there are problems of poor operability and high application cost

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