Harmless treatment method for tail mud of paper mill

Abstract

The invention relates to a harmless treatment method for tail mud of a paper mill, which belongs to the technical field of harmless treatment of sludge and particularly comprises the following steps: sterilizing the tail mud of the paper mill through a sterilization system, then carrying out filter pressing treatment on the tail mud in a filter pressing system, squeezing part of moisture, then conveying the filter-pressed tail mud of the paper mill to a drying system, and drying for 10-15 hours, the dried tail mud of the paper mill is conveyed to a grinding system for grinding treatment, the granularity of the treated tail mud is 100-150 meshes, then the ground tail mud of the paper mill is mixed with resin powder and water-soluble rubber powder, the mixture is conveyed into a reaction kettle after being mixed, a reaction is conducted under the heat tracing condition, the reaction temperature is 100-200 DEG C, the reaction time is 48-72 h, and the tail mud of the paper mill is obtained. The reacted mixture is subjected to color mixing treatment and then is used for industrial coating treatment, operation is easy, and harmless treatment of the paper mill tail mud can be achieved.

Description

Technical Field

[0001] The present invention relates to a method for harmless treatment of papermill tail mud, belonging to the technical field of sludge harmless treatment. Background Art

[0002] When treating papermill wastewater, it is generally adsorbed by powdered calcium hydroxide. After adsorption, a paste-like solid waste product will be formed, which is very difficult to treat. Summary of the Invention

[0003] To solve the technical problems existing in the prior art, the present invention provides a method for harmless treatment of papermill tail mud.

[0004] To achieve the above object, the technical solution adopted by the present invention is a method for harmless treatment of papermill tail mud. The papermill tail mud is sterilized by a sterilization system and then enters a filter press system for filter press treatment to squeeze out part of the water. Then, the filter-pressed papermill tail mud is transported to a drying system for drying treatment for 10 - 15 h. The dried papermill tail mud is transported to a grinding system for grinding treatment, and the particle size of the treated tail mud is 100 - 150 mesh. Then, the ground papermill tail mud is mixed with resin powder and water-soluble rubber powder, and the mixture is transported to a reaction kettle and reacted under heat tracing conditions. The reaction temperature is 100°C - 200°C, and the reaction lasts for 48 - 72 h. After the reaction, the mixture is subjected to color adjustment treatment and then used as an industrial coating.

[0005] Preferably, part of the ground papermill tail mud is input into a calcination kiln by a screw pump for aerobic calcination at a calcination temperature of 1000°C - 1200°C for 3 - 6 h. After calcination, the papermill tail mud recovers its activity and is sealed and stored under anaerobic conditions.

[0006] Compared with the prior art, the present invention has the following technical effects: The present invention uses chemical decomposition and physical degradation for harmless treatment to stimulate and transform the solid waste. All the sterilization groups in the solid waste are eliminated, and after drying, grinding, reacting with resin powder and water-soluble rubber powder, an industrial coating is formed. It can also be calcined in a calcination kiln to recover its activity and be reused. Detailed Embodiments

[0007] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0008] Example 1, a method for harmless treatment of papermill sludge. The papermill sludge is sterilized by a sterilization system and then enters a filter press system for filter pressing to squeeze out part of the water. Then, the filter-pressed papermill sludge is transported to a drying system for drying for 10 - 15 hours. The dried papermill sludge is transported to a grinding system for grinding, and the particle size of the treated sludge is 100 - 150 mesh. Then, the ground papermill sludge is mixed with resin powder and water-soluble rubber powder, and the mixture is transported into a reaction kettle and reacts under heat tracing conditions. The reaction temperature is 100°C - 200°C, and the reaction lasts for 48 - 72 hours. After the reaction, the mixture is subjected to color adjustment treatment and then used for industrial coating treatment.

[0009] Example 2, a method for harmless treatment of papermill sludge. The papermill sludge is sterilized by a sterilization system and then enters a filter press system for filter pressing to squeeze out part of the water. Then, the filter-pressed papermill sludge is transported to a drying system for drying for 10 - 15 hours. The dried papermill sludge is transported to a grinding system for grinding, and the particle size of the treated sludge is 100 - 150 mesh. Then, the ground papermill sludge is pumped into a calcination kiln by a screw pump for aerobic calcination. The calcination temperature is 1000°C - 1200°C, and the calcination lasts for 3 - 6 hours. After calcination, the papermill sludge regains its activity and is stored in a sealed manner under anaerobic conditions.

[0010] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the scope of the present invention.

Claims

1. A method for harmless treatment of tail mud in a paper mill, characterized in that: The papermill sludge enters the pressure filtration system for pressure filtration after being sterilized by the sterilization system, squeezing out some moisture. Then, the pressure-filtered papermill sludge is transported to the drying system for drying for 10 - 15 hours. After drying, the papermill sludge is transported to the grinding system for grinding. The particle size of the treated sludge is 100 - 150 mesh. Then, the ground papermill sludge is mixed with resin powder and water-soluble rubber powder, and the mixture is transported into the reaction kettle and reacts under heat tracing conditions. The reaction temperature is 100°C - 200°C, and the reaction lasts for 48 - 72 hours. After the reaction mixture is subjected to color adjustment treatment, it is used for industrial coating treatment.

2. The harmless treatment method of the tail mud of a paper mill according to claim 1, characterized in that: Part of the ground papermill sludge is pumped into the calcination kiln by a screw pump for aerobic calcination at a calcination temperature of 1000°C - 1200°C for 3 - 6 hours. After calcination, the papermill sludge regains its activity and is stored in a sealed manner under anaerobic conditions.