System and method for utilizing municipal waste and industrial solid waste construction 3D printing materials

A 3D printing and industrial solid waste technology, applied in the direction of solid waste management, sustainable waste treatment, additive processing, etc., can solve the problems of high investment in sludge dewatering equipment, high operation and maintenance costs, and environmental pollution caused by odorous gas, achieving Effect of eliminating dehydration process, reducing dehydration cost and energy consumption, and reducing production cost

Active Publication Date: 2019-04-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies cannot completely and simultaneously realize the reduction, stabilization, harmlessness and recycling of sludge, and there will always be many follow-up problems, such as large energy consumption, foul gas pollution caused by technical operations, and incineration. Exhaust gas produces toxic gases such as dioxins, etc.
[0007] At present, in order to utilize sludge as a resource, it is necessary to dehydrate the sludge first to reduce its water content to about 50%. However, the investment in sludge dewatering equipment is high, and the later operation and maintenance costs are also high and cause a lot of waste of water resources.

Method used

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  • System and method for utilizing municipal waste and industrial solid waste construction 3D printing materials
  • System and method for utilizing municipal waste and industrial solid waste construction 3D printing materials
  • System and method for utilizing municipal waste and industrial solid waste construction 3D printing materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] Preparation using the above system and process, the specific parameters, calculation results and testing are as follows: based on the quality of the solid-liquid mixture after mixing and matching, the dry weight ratio of wet sludge, mineralized garbage, red mud, desulfurized gypsum and calcium carbide slag It is 8:12:25:15:40. The mechanically dehydrated raw meal is directly transported into the rotary kiln for calcination. The calcination temperature is 1310°C and the calcination time is 60 minutes. At this time, toxic and harmful substances such as dioxins can be eliminated. Then the flue gas passes through the waste heat recovery equipment to recover the heat. Finally, the flue gas was subjected to dust removal and flue gas treatment, and no harmful substances such as dioxins were found in the flue gas after treatment. The obtained product was tested by the cement mortar strength test method (GB / T 17671-1999), and the compressive strength for 2 hours was 15.4MPa, and...

Embodiment 2

[0117] Preparation using the above system and process, the specific parameters, calculation results and testing are as follows: based on the quality of the solid-liquid mixture after mixing and matching, the dry weight ratio of wet sludge, mineralized garbage, red mud, desulfurized gypsum and calcium carbide slag It is 8:15:20:12:45. The mechanically dehydrated raw meal is directly transported into the rotary kiln for calcination, the calcination temperature is 1280 ℃, and the calcination time is 60 minutes. No harmful substances such as dioxins were found in the flue gas after treatment. According to the cement mortar strength test method, the 2h compressive strength is 14.2MPa, and the 3-day and 28-day compressive strength are 41.5MPa and 54.5MPa, respectively. The initial setting time is 24min, and the final setting time is 35min. It meets the requirements of building 3D printing materials.

Embodiment 3

[0119] Preparation using the above system and process, the specific parameters, calculation results and testing are as follows: based on the quality of the solid-liquid mixture after mixing and matching, the dry weight ratio of wet sludge, mineralized garbage, red mud, desulfurized gypsum and calcium carbide slag It is 8:10:18:10:54. The mechanically dehydrated raw meal is directly transported into the rotary kiln for calcination, the sintering temperature is 1300°C, and the calcination time is 45 minutes. No harmful substances such as dioxins were found in the flue gas after treatment. According to the cement mortar strength test method, the 2h compressive strength is 13.4MPa, and the 3-day and 28-day compressive strength are 39.6MPa and 51.8MPa, respectively. The initial setting time is 30 minutes, and the final setting time is 42 minutes. It meets the requirements of building 3D printing materials.

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Abstract

The present invention discloses a system and a method for preparing a building 3D printing material by using municipal waste and industrial solid waste. The system comprises a homogenization pool, a wet powder mill, a filter press, a rotary kiln, a powder mill and a hot water storage tank. According to the method, wet sludge produced from an urban sewage treatment plant is directly mixed with mineralized garbage, red mud, desulfuration gypsum, carbide slag and industrial water to form a mixed solution without dewatering, a dry weight ratio of the wet sludge to the mineralized garbage to the red mud to the desulfuration gypsum to the carbide slag in the mixed solution is 5-10:5-10:15-30:10-20:30-60, the solid-liquid ratio in the mixed solution is maintained at 1:3-1:4, the mixed solution is sequentially subjected to wet milling, homogenization treatment and alkali removing, the homogenization treatment temperature is 60-70 DEG C, the homogenized material is subjected to mechanical pressure filtration dehydration, and the filtered material is subjected to high temperature calcination to obtain the building 3D printing material precursor.

Description

Technical field [0001] The invention relates to the field of comprehensive utilization of resources of chemical industry, building materials technology and bulk industrial solid waste and urban sludge and environmental protection treatment, and specifically relates to a system and method for utilizing urban waste and industrial solid waste construction 3D printing materials. Background technique [0002] 3D printing is affecting people's production and life as a rapidly developing new manufacturing technology. Architectural 3D printing technology has outstanding features such as high efficiency in modeling, economy and environmental protection, precise processing, individualized production, and no construction waste. It is believed that it will subvert the traditional construction model and bring the construction industry into the digital age. [0003] The core of architectural 3D printing technology is the printing ink materials used. The materials used in 3D printing buildings ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B18/30C04B18/04B33Y70/00B33Y10/00
CPCY02W30/91
Inventor 王文龙李国麟赵希强毛岩鹏孙静宋占龙
Owner SHANDONG UNIV
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