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System and method for preparing building 3D printing material by using municipal waste and industrial solid waste

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: 2017-06-30
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 preparing building 3D printing material by using municipal waste and industrial solid waste
  • System and method for preparing building 3D printing material by using municipal waste and industrial solid waste
  • System and method for preparing building 3D printing material by using municipal waste and industrial solid waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] The above system and process are used for preparation, and the specific parameters, calculation results and detection are as follows: based on the mass of solid-liquid mixture after mixing and matching, the dry weight ratio of wet sludge, mineralized waste, red mud, desulfurized gypsum and calcium carbide slag 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 dioxin can be well eliminated. Then the flue gas passes through the waste heat recovery equipment to recover the heat. Finally, dust removal and flue gas treatment are carried out on the flue gas, and no harmful substances such as dioxins are found in the treated flue gas after testing. The obtained product is tested by the cement mortar strength test method (GB / T 17671-1999), and the 2h compressive strength is 15.4MPa, and ...

Embodiment 2

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

Embodiment 3

[0119] The above system and process are used for preparation, and the specific parameters, calculation results and detection are as follows: based on the mass of solid-liquid mixture after mixing and matching, the dry weight ratio of wet sludge, mineralized waste, red mud, desulfurized gypsum and calcium carbide slag 8:10:18:10:54. The mechanically dehydrated raw meal is directly transported into the rotary kiln for calcination, the calcination temperature is 1300°C, and the calcination time is 45 minutes. No harmful substances such as dioxins were found in the treated flue gas after testing. According to the cement mortar strength test method, the 2h compressive strength is 13.4MPa, and the 3day and 28day 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 for the use of architectural 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 fields of chemical industry, building materials technology, comprehensive utilization of resources and environmental protection and management of bulk industrial solid waste and urban sludge, and specifically relates to systems and methods 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, economical and environmentally friendly, precise processing, personalized production, and no production of construction waste. It is believed that it will subvert the traditional construction model and completely bring the construction industry into the digital era. [0003] The core of architectural 3D printing technology is the printing ink material used. At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/30C04B18/04B33Y70/00B33Y10/00
CPCY02W30/91C04B28/144B33Y10/00B33Y70/00C04B18/0409C04B18/0418C04B18/0481C04B18/30C04B2201/50C04B14/28C04B18/141C04B24/24C04B22/10C04B22/0013C04B2103/0068C04B14/06
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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