A waste recycling system and method for a concrete mixing plant

Abstract

The invention relates to the technical field of waste recycling, in particular to a method and a system for recycling waste materials in a concrete mixing station. The method comprises the following steps: collecting waste slurry, separating waste slurry from gravels, preparing homogenous waste slurry, pumping the homogenous waste slurry into a concentration detection barrel, calculating the density of the homogenous waste slurry according to a relation between the volume V and the weight m, then calculating the concentration of the homogenous waste slurry according to a linear relation between the percentage concentration and the density of the homogenous waste slurry, comparing the calculated concentration of the homogenous waste slurry with a set solid content percentage concentration K, and blending to enable the concentration of the homogenous waste slurry to be less than or equal to the set solid content percentage concentration K; when the solid content percentage concentration is less than or equal to the set solid content percentage concentration K, pumping the homogenous waste slurry into a finished product slurry tank for storage to realize new concrete mixing and blending. According to the method, the problem of waste material treatment of the concrete mixing station can be thoroughly solved; the method has the characteristics of being easy to operate, reducing the cost of a concrete production enterprise and the like.

Description

technical field [0001] The invention relates to the technical field of waste recycling, in particular to a waste recycling system and method for a concrete mixing plant. Background technique [0002] Concrete mixing plant is the place where the concentrated production of concrete is produced. After the concrete is synthesized, it needs to be transported to the construction site by a mixer truck. However, after the mixing plant and transportation, the mixing plant and the mixer truck will generate a lot of waste, which will lead to the failure of the concrete mixing plant. Waste piles up into mountains. According to data analysis results, every cubic concrete produced will produce 20-30kg of waste. Among them, sand and gravel can be recycled and used by sand and gravel separator, but 8-10kg (converted into solid content) waste slurry with small particles (less than 4.75mm) is difficult to handle, which will cause great pollution to the internal environment of the mixing stati...

AI Technical Summary

Problems solved by technology

[0002] Concrete mixing plant is the place where the concentrated production of concrete is produced. After the concrete is synthesized, it needs to be transported to the construction site by a mixer truck. However, after the mixing plant and transportation, the mixing plant and the mixer truck will generate a lot of waste, which will lead to the failure of the concrete mixing plant. Waste piles up into mountains. According to data analysis results, every cubic concrete produced will produce 20-30kg of waste

Among them, sand and gravel can be recycled and used by sand and gravel separator, but 8-10kg (converted into solid content) waste slurry with small particles (less than 4.75mm) is difficult to handle, which will cause great pollution to the internal environment of the mixing station

[0003] The current treatment methods for the waste generated by the concrete mixing plant and its mixing transport vehicles include: (1) First, the sand and gravel separation device is used to separate the sand and gravel. After the separation, the sand and gravel are recycled. This treatment method not only costs a lot, and the dumping place is difficult to find, but also cannot be dumped at will due to environmental protection requirements; (2) After the sand and gravel are separated and used for mixing, the existing problem is that the concentration fluctuates greatly, which is difficult to control, resulting in large fluctuations in the quality of the concrete, etc. (3) After the sand and gravel separation, the waste slurry is dehydrated to form a solid block with a low water content, and then transported to the mixing station for dumping. Ask questions that cannot be dumped at will

[0004] The application number is 201310692247.X Chinese invention patent discloses a waste water recovery system and a method of recycling using the system. In this method, the waste slurry is subjected to sedimentation treatment. It is used as cleaning equipment for the related equipment of the mixing station. The problems of this method include: 1. The waste water used for car washing and cleaning equipment enters the waste slurry pool again, and the waste slurry cannot be reduced. 2. The part of the waste used for mixing concrete Waste water cannot be used at a fixed concentration, and there are quality risks. 3. According to the proportion of waste water generated, the system can only use a small amount of waste water, and the remaining part of waste water needs to be treated by other methods

The application number is 201510375198.6 Chinese invention patent discloses a concrete mixing station waste residue utilization system and operation process, the method measures the concentration of waste slurry through a sensor, and automatically converts it into the replaced fly ash content and water consumption through the calculation control platform, and the The required sewage is pumped into the sewage metering scale on the mixing station, and after being weighed by the sewage scale, the required clean water is simultaneously discharged into the mixer to produce qualified concrete. The problems of this method include: 1. The concentration range of the waste slurry is small, The accuracy of using sensors to measure the concentration of waste pulp is low, and the amount of use cannot be precisely controlled; 2. This method uses sensors to measure the concentration of waste pulp. According to different concentration values, technicians are required to adjust the amount of waste pulp in production, which increases manpower. cost, and there is a risk of inaccurate calculation; 3. In order to ensure the quality of concrete, this method minimizes the amount of sewage used, which will lead to endless use of waste slurry water, and the remaining sewage needs to be treated by other treatment methods; 4 1. The waste slurry contains fine cement and other particles. The sensor may be damaged in the waste slurry for a long time, and the maintenance frequency is high.

The application number is 201511025619.9 Chinese invention patent discloses a waste slurry recycling process for concrete mixing plants. The solution is to add retarder, cement, mineral admixtures, water, water reducing agent, early strength agent and Activator, then generate concrete products, the problems of this method include: 1, the way is to use the waste slurry treatment to prepare foam concrete or air-entrained concrete, need to increase the relevant equipment for making foam concrete or air-entrained concrete, and the investment cost is large , 2. This method requires several acres of open space for processing, and has high requirements for the site. 3. The patent has not yet solved the related problems of accurately controlling the concentration of waste pulp

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