Ecological restoration method of oxidized ore waste rock site based on phosphate fertilizer to control acid

Abstract

The invention discloses an ecological restoration method applicable to an oxidized ore waste-rock yard and capable of realizing acidification control on the basis of phosphate fertilizer. The method comprises steps as follows: a slope surface is cleaned; a grating is laid; slope protection is realized by the aid of ecological bags; a lime layer is spread; a phosphate fertilizer layer is sprayed; ecological rods are erected; a second layer of grating is laid; a soil improvement matrix layer and a seed layer are sprayed and seeded; straw curtains are used for shading; intercepting and draining ditches are arranged. According to the method, lime is used for shallow acid and alkali neutralization improvement, the phosphate fertilizer is used for controlling further oxidation of sulfides so as to realize the acidification control effect, pollutants such as heavy metals and the like are fixed through a plant stabilization technology, the ecological restoration purpose is achieved, adopted materials are cheap and easy to obtain, the construction process is simple, and the ecological restoration cost of the oxidized ore waste-rock yard is greatly reduced.

Description

technical field [0001] The invention belongs to the field of soil ecological restoration, and in particular relates to an ecological restoration method for an oxidized ore waste rock field. Background technique [0002] Due to the reduction process, oxidation process, acid dissolution and complexation reaction, the oxidized ore waste rock dump shows extremely strong acidity, and the pH value of the soil is between 2-4, and acidification is the waste rock dump An important limiting factor for vegetation reestablishment, high concentrations of H + It will lead to the inactivation of the enzyme system, inhibit the respiration of the plant and the absorption of water and nutrients by the root system. Therefore, the key to the ecological restoration of oxidized ore waste rock dumps is to inhibit the acidification process. [0003] Regarding acidification control technology, it can be roughly divided into physical isolation, chemical neutralization, plant stabilization, microbia...

AI Technical Summary

Problems solved by technology

However, the H buried under the topsoil + , salt, heavy metals and other harmful substances may rise to the topsoil layer or even the surface through soil capillary action, and continue to cause harm

Another mainstream physical isolation method is to cover one to several layers of inert materials such as coal slag, steel slag, gravel, etc. between the waste rock and the topsoil, which can prevent H + , Toxic metal ions migrate to the surface soil layer, but this method is usually very expensive, and it is difficult to realize when the mine area is large; the commonly used method of chemical neutralization to control acidification is to add acid neutralizer to eliminate the formed acidic substances and inhibit For the further oxidation of sulfides and the production of new acidic substances, the most commonly used neutralizers are limestone slag, slaked lime or hydrated lime, and burnt lime, but the modified method only eliminates the formed acidic substances and can use a fast-reaction acid neutralizer to inhibit Further oxidation of sulfides and generation of new acidic species is less ideal; control of acidification using plants is a challenging subject

Some of these plants (ecotypes) have been commercially used for vegetation restoration of acid mining wasteland, but the growth of surface vegetation is not sustainable if the acid production process in oxidized ore waste rock dumps cannot be fundamentally inhibited; and Compared with chemical treatment, microbial treatment technology is generally more difficult to predict and control, and its long-term and stability are more uncertain. Therefore, further exploration is needed to truly implement this technology in the treatment of acid mining wasteland

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