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System and method for preparing sulphoaluminate cement from municipal waste and industrial solid waste

A technology of sulphoaluminate cement and industrial solid waste, which is applied in the system field of preparing sulphoaluminate cement, which can solve the problems of odor pollution, high energy consumption, waste of water resources, etc., and reduce dehydration costs and energy consumption , Reduce the difficulty of control and save water resources

Active Publication Date: 2019-08-20
山东卓联环保科技有限公司 +1
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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.
[0005] 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 sulphoaluminate cement from municipal waste and industrial solid waste
  • System and method for preparing sulphoaluminate cement from municipal waste and industrial solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] 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 the solid-liquid mixture after mixing and matching, the dry weight ratio of wet sludge, red mud, desulfurized gypsum and calcium carbide slag is 10:30 :20:40. 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. After the cement standard mortar strength test, the 3-day and 28-day compressive strengths are 47.8Mpa and 60.5Mpa respectively.

Embodiment 2

[0072] 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 the solid-liquid mixture after mixing and matching, the dry weight ratio of wet sludge, red mud, desulfurized gypsum and calcium carbide slag is 5:15 :10:60. 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. After the cement standard mortar strength test, the 3-day and 28-day compressive strengths are 47.4Mpa and 56.2Mpa respectively.

Embodiment 3

[0074] The above system and process are used for preparation, and the specific parameters, calculation results and tests are as follows: based on the mass of solid-liquid mixture after mixing and matching, the dry weight ratio of wet sludge, red mud, desulfurized gypsum and calcium carbide slag is 8:23 :15:54. 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. After the cement standard mortar strength test, the 3-day and 28-day compressive strengths are 47.6Mpa and 58.4Mpa respectively.

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Abstract

The invention discloses a system and method for preparing sulfoaluminate cement by use of urban waste and industrial solid waste. The system comprises a homogenizing tank, a wet-process pulverizer, a filter press, a rotary kiln and a hot water storage tank. The method comprises the following steps: homogenizing and dealkalizing red mud, desulfurized gypsum, carbide slag, wet sludge and industrial water in the homogenizing tank; pulverizing the dealkalized product in the wet-process pulverizer; performing mechanical filter pressing in the filter press; performing high-temperature calcination on the solid material obtained after the filter pressing in the rotary kiln to obtain sulfoaluminate clinker; and performing mixed pulverizing on the sulfoaluminate clinker and desulfurized gypsum in a cement pulverizer to obtain sulfoaluminate cement, wherein hot water in the hot water storage tank supplies heat to the homogenizing tank. With the system and method, urban sludge and industrial solid waste with high moisture content and production of high-performance sulfoaluminate cement can be perfectly combined on a production line.

Description

technical field [0001] The invention relates to the fields of chemical industry, building material technology, comprehensive resource utilization of bulk industrial solid waste and urban sludge, and environmental protection treatment, and specifically relates to a system and method for preparing sulphoaluminate cement by utilizing urban waste and industrial solid waste. Background technique [0002] Since the reform and opening up, with the rapid development of my country's industry and the acceleration of urbanization, a large number of various toxic and harmful industrial solid wastes have been produced, and the number is still rising. Bulk industrial solid waste, referred to as bulk solid waste, refers to the industrial solid waste that produces more than 10 million tons annually in the field of industrial production in my country and has a great impact on the environment and safety, mainly including red mud, desulfurized gypsum, smelting slag, and tailings sand and coal g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/32
Inventor 吴长亮任常在刘晓斌刘全勋王勇付华辉
Owner 山东卓联环保科技有限公司