Method for restoring organic contaminated soil by using ceramsite preparation process

Abstract

The invention relates to a harmless and resource technology for preparing a lightweight aggregate ceramsite by curing sintering of organic contaminated soil, at the same time, belongs to the field of contaminated soil restoration, and particularly provides a method for restoring the organic contaminated soil by using a ceramsite preparation process. The method includes the following steps: a, drying the organic contaminated soil in a 90-110 DEG C drying oven; b, crushing and grinding finely the organic contaminated soil of the step (a) with a ball mill, passing through a 100 mesh sieve, and sieving; c, stirring and mixing evenly the organic contaminated soil powder sieved in the step (b) with fly ash by a measuring and feeding system, conveying to a stirring nucleation system, adding water, mixing and nucleating, then producing molded blanks in a double-disc granulator machine, and conveying the blanks to a secondary drying room; d, preheating and sintering in an ignition sintering system; e, taking natural gas and coal gas in the step (d) as fuels, taking hot air as a co-fuel, mixing, and allowing the mixed gas to enter an ignition furnace spray nozzle in the ignition sintering system; and f, naturally cooling to room temperature in a finished product sieving system to obtain the ceramsite product.

Description

technical field [0001] The invention relates to a harmless and resource-based technology for producing lightweight aggregate ceramsite by solidifying and sintering polluted soil, and belongs to the field of polluted soil restoration, in particular to a method for preparing ceramsite to repair organic polluted soil. Background technique [0002] At present, there are mainly the following methods for soil remediation of semi-volatile highly toxic organic pollution (polycyclic aromatic hydrocarbons, organochlorine pesticides, etc.): chemical oxidation technology, thermal desorption technology, soil elution technology, cement kiln co-processing technology, phytoremediation technology, bioremediation technology, gas stripping technology, etc. Except for thermal desorption and cement kiln co-processing technologies, other remediation technologies have limited effects on semi-volatile highly toxic organic pollution, and it is difficult to achieve low-concentration remediation targe...

AI Technical Summary

Problems solved by technology

Except for thermal desorption and cement kiln co-processing technology, other remediation technologies have limited effect on semi-volatile highly toxic organic pollution, and it is difficult to achieve the remediation target value of low concentration

[0003] For example, the related equipment for thermal desorption is expensive, the desorption time is too long, and the treatment cost is too high. The problems have not been well solved; the cement kiln co-processing technology is suitable for treating all organic polluted soils, but this process uses polluted soils to produce cement cooked Due to the characteristics of raw materials, the treatment volume of contaminated soil is relatively small (for example, a 4,000-ton cement production line can only process 200 tons of soil per day), which affects the treatment progress and increases the difficulty of secondary pollution prevention and control

Images