Use of attapulgite in soil heavy metal pollution restoration agent

Abstract

The invention discloses a use of attapulgite in a soil heavy metal pollution restoration agent. A preparation method of the attapulgite-based soil heavy metal pollution restoration agent comprises the following steps of 1, raw ore treatment: crushing attapulgite ore, 2, acidification treatment: slowly adding 2mol / L of dilute sulphuric acid into the attapulgite ore, carrying out acidification treatment and then carrying out activation, 3, drying in the sun and screening: transporting the acidified attapulgite clay to a cement place, carrying out drying in the sun until water content is less than 14%, carrying out crushing and carrying out screening by a vibrating screen, and 4, roasting and packaging: inputting the screened powder into a roasting furnace, carrying out roasting and carrying out cooling and packaging so that the attapulgite-based soil heavy metal pollution restoration agent is prepared. The attapulgite clay subjected to sulfuric acid acidification has the characteristics of large specific surface area and high amount of porosity, has high activity and adsorptivity, can reduce a ratio of liquid heavy metal in the soil and realizes soil heavy metal passivation and heavy metal-polluted soil restoration.

Description

Technical field [0001] The invention belongs to the technical field of remediation of heavy metal contaminated soil, and in particular relates to the use of an attapulgite as a remediation agent for soil heavy metal pollution. Background technique [0002] At present, soil heavy metal pollution control methods are mainly divided into engineering remediation and bioremediation. Each method has certain advantages and disadvantages. Remediation of heavy metal contaminated soil by engineering has the advantages of thoroughness and stability, but the large amount of engineering and the high cost of treatment can easily lead to weakening of soil fertility. Bioremediation measures are simpler to implement, less investment, and less disturbing to the environment, but the governance efficiency is low. The main manifestation is that the hyperaccumulative plants that have been used in production are usually short, low biomass, slow growth and long cycle, and it is difficult to achieve the ...

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Problems solved by technology

Although my country has a large resource reserve of attapulgite, due to its late discovery, its development and utilization level is low, and the foundation of the national non-metallic mineral processing industry is relatively weak, and the attapulgite products that can be produced are still relatively low compared with other countries. Quite few, so that the application of this economically significant mineral deposit is limited to general fillers, and even exported cheaply in the form of raw soil, resulting in a waste of resources