Treatment method for heavy metal solid waste pollutants

Abstract

The invention provides a treatment method for heavy metal solid waste pollutants. The treatment method comprises the following treatment steps of: preparing a heavy metal dissolvent according to heavymetal containing components; mixing the heavy metal solid waste pollutants, the heavy metal dissolvent and hot water according to a ratio and afterwards carrying out wet grinding on the mixture in agrinding machine; primarily separating a solution containing heavy metal ions from slurry by using a multi-stage separator; purifying or refining the primarily-separated heavy metal ion solution; stewing the treated ion solution, and guiding out the stewed solution as circulating water for production; proportionally mixing the slurry separated in the step (3), the water obtained in the step (5) and other materials and reagents; manufacturing a blank body by using a novel building base material in the step (6); compacting the blank body in the step (7); carrying out steam-curing on the blank body inside a high-temperature and high-pressure steam-curing kettle for 17-22 h; and getting the blank body out of the steam-curing kettle to obtain a finished product, or deeply processing the finished product. The treatment method provided by the invention has the characteristics of saving energy, reducing environmental pollution and the like.

Description

(1) Technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to a method for treating heavy metal solid waste pollutants. (2) Background technology [0002] At present, heavy metal waste solid waste pollutants, waste water, etc. seriously endanger the natural environment of our country. Heavy metal pollution has seriously affected people's production environment. The solution to the problem of heavy metal pollution is an imminent problem. There are three commonly used methods for waste pollutants: landfill method, cement brick method, and sintering method; some of these methods are a waste of resources in themselves, or have high economic costs, which are not conducive to promotion. The landfill method refers to digging a foundation pit for filling, making an anti-seepage layer at the bottom of the pit, then filling the pit with heavy metal solid waste pollutants, covering it with clay, and then planting trees on the clay ...

AI Technical Summary

Problems solved by technology

However, there are many shortcomings in the landfill method, such as serious waste of resources, need to occupy a large amount of land area, and cause secondary pollution to the surrounding environment. At the same time, this method is very uneconomical. The anti-seepage layer, covering clay, planting trees, etc. all require a large amount of capital investment, but there is no output if there is too much investment

The cement brick method refers to mixing heavy metal solid waste pollutants into cement mortar bricks in proportion, but this method also has the following disadvantages: the surface of cement mortar bricks is rough, the surface is difficult to coat with paint, and the surface is easy to leak heavy metal trace elements. The parameters of heavy metal waste in bricks are limited, and it is difficult to deal with large quantities of heavy metal solid waste pollutants

As for the sintering method, the heavy metal waste sludge or clay is made into clay bricks and sintered into bricks to achieve the purpose of solidifying heavy metal solid waste pollutants. However, the production of sintered bricks requires high energy consumption. When the composition is complex, the quality of sintered bricks is difficult to guarantee, and the scope of use of sintered bricks is limited, and the small amount makes the treatment of heavy metal solid waste pollutants also limited.