Method for separating and porcelainizing soil for treating toxic land parcel

Abstract

The invention discloses a method for separating and porcelainizing soil for treating a toxic land parcel and relates to harmless treatment and utilization of the toxic land parcel. A method for detecting toxic areas of the toxic parcel is conducted based on composition of soil, separation of soil, high-temperature damage to toxic organic compound molecular structures, high-temperature damage to toxic inorganic compound molecular structures, mineral recombination, a sealing effect on glass phases and safety, volume weight and purposes of stoneware or ceramic particles and stoneware or ceramic sand grains. The toxic areas of the toxic land parcel are detected; the soil is separated; a stony material is cleaned and detoxified; the soil is broken and directly fired to be detoxified; gravel soil difficult to separate is smashed, formed and fired to be detoxified; sand and clay are formed and fired to be detoxified; and smoke is treated and metal is recovered. The fired stoneware or ceramic particles and the fired stoneware or ceramic sand grains are used for replacing river sand, gravel and ceramsite and to be used as backfill materials, roadbed materials, filtering materials, building materials, dustproof water seepage face materials of gardens and the like.

Description

technical field [0001] This technical solution involves the harmless treatment of toxic plots, the composition of soil in toxic plots, the separate treatment of different soil components, the destruction and decomposition of organic compound molecules by high temperature, the destruction of inorganic compound molecules by high temperature and the recombination of new minerals, the glass phase The role of stoneware or porcelain grains, the production, definition, bulk density, and use of stoneware or porcelain sand grains. Background technique [0002] In the 1970s, Europe, the United States, Japan and other countries discovered that industrial production and hazardous waste polluted the land and threatened sustainable development, and called the polluted land "brownfield" or "toxic land", and began research, governance, and legislation 1. According to the census of soil pollution, there are about 500,000 polluted plots in the United States and about 300,000 plots in Germany....

AI Technical Summary

Problems solved by technology

[0009] 2. There are often multiple pollutants in "toxic land", and each of the above methods generally cannot remove multiple pollutants at the same time, such as heating the soil to make volatile harmful heavy metals or volatile organic compounds volatilize from the soil and remove them. The method of collecting and processing them together has little effect on harmful metals with high melting point and high boiling point. For example, the melting point of chromium is 1857°C and the boiling point is 2672°C; the melting point of beryllium is 1283°C and the boiling point is 2920°C, etc.

[0010] 3. One of the essences of the treatment of "toxic land" is the treatment of hazardous waste. From 2005 to 2012, my country took 7 years to treat 4 million tons of chromium slag on the ground, and a considerable part of it was treated by chemical methods. For example, the former Changsha chromium salt factory 42 The 10,000-ton chromium slag cost 226 million yuan to be treated by chemical methods, that is, the ferrous sulfate reduction method was used to complete the treatment in October 2010. In May 2014, it was found that there were re-oxidation, poisonous return, and a large amount of toxic yellow water oozing out. Explain that the use of chemical methods has considerable risks

[0011] 4. Use bioremediation methods to plant plants that can absorb heavy metals in the soil on "toxic land" to reduce heavy metal pollution in the soil. Domestic researchers have found that this method is expensive and difficult, and the natural absorption process of plants is slow. Pollution cannot be solved fundamentally, it is only the transfer of harmful substances, it is impossible to allow it to enter the food chain, a large number of harvested plants are difficult to use, and long-term storage is also very risky

[0012] 5. Our country has built office buildings, residential buildings and schools in many "poisonous lands" in the past, leaving major hidden dangers

There are many kinds of pollutants that lead to "toxic plots". A "toxic plot" may contain many kinds of pollutants. According to the current treatment methods, the treatment cost of each treatment method is relatively high, and the reliability is not high. Imperfect governance methods, high governance costs, and the governance and use of "toxic land" have become unprecedented problems