Resourceful treatment method of paper-making sludge and system

Abstract

The invention provides a resourceful treatment method of paper-making sludge and a system; the method comprises the following steps: mechanical dehydration, untwining and granulation and secondary drying are carried out to the paper-making sludge, and then waste gas and waste heat are combusted and recovered, low-temperature slag after secondary drying is separated and is reacted with low-temperature waste gas which is dried preliminarily, finally, extraction is carried out, and the product is sent to a processing procedure; the system comprises a spiral dehydration device, a untwining and granulation machine, a waste gas drier, a high-temperature slag drier, a separation tank, a reaction tank and an extraction tank which are sequentially connected, the waste gas drier is provided with a high-temperature waste gas inlet port, the high-temperature slag drier is provided with a high-temperature slag inlet port, a waste gas and waste heat recovery device is arranged between the waste gasdrier and the high-temperature slag drier, a low-temperature waste gas outlet end of the waste gas drier is connected with the reaction tank, a waste water output end of the extraction tank is connected with the reaction tank. The method effectively realizes reclamation of energy resources and inorganic fillers in the paper-making sludge, reduces environmental pollution of solid waste and solves the problem that land is less with a paper-making sludge bury method.

Description

technical field [0001] The invention relates to the technical field of papermaking industry waste treatment and resource utilization, in particular to a papermaking sludge treatment method and system. Background technique [0002] Pulping and papermaking is one of the important industries of my country's national economy. At present, the output of paper and cardboard produced in my country has leapt to the first place in the world. In the past three years, the proportion of secondary fiber in papermaking raw materials has exceeded 56%. However, a large amount of papermaking waste sludge is produced in the papermaking process. With the current papermaking scale in my country, it is estimated that the papermaking sludge produced has reached 20 million tons per year. The treatment of papermaking sludge has become the main object of environmental protection in my country's papermaking industry. [0003] The papermaking sludge mainly comes from the following three aspects: one i...

AI Technical Summary

Problems solved by technology

[0005] At present, the main methods of dealing with papermaking sludge in the world are landfill and incineration, while the treatment of papermaking sludge in my country mainly adopts the method of direct landfill. The consequences of this method are: it needs to occupy a lot of land, and it will It causes secondary pollution to the environment around the landfill, and what is more serious is that many places have no land for landfill, which has become a bottleneck restricting the development of enterprises

Incineration treatment has been adopted in some large paper mills, but it is only used as sludge harmless and reduction treatment, and cannot recycle paper sludge, so it has not fundamentally solved the problem of land occupation and pollution of paper sludge

Images