Ecological restoration method of oxidized ore waste rock field based on lake sediment acid control

Abstract

The invention provides an ecological restoration method applicable to an oxidized ore waste-rock yard and capable of realizing acidification control on the basis of lake sediment. The method comprises steps as follows: a slope surface is cleaned; a first layer of grating is laid; slope protection is realized by the aid of ecological bags; a lime layer is sprayed; the lake sediment covers the lime layer; 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 phenomena of lean soil, high heavy metal content and high acidity of the oxidized ore waste-rock yard, the oxidized ore waste-rock yard is ecologically restored through following measures: (1) quick lime and the lake sediment are used for achieving neutralization and isolated acidification control purposes; (2) a better soil environment is provided for plant planting through soil matrix improvement; (3) migration and transformation of heavy metals in soil are controlled through the plant stabilization technology, and the influence of the heavy metals on surroundings is reduced. The method is convenient to operate, low in cost and environment-friendly in the actual construction process.

Description

technical field [0001] The invention belongs to the field of ecological restoration, and in particular relates to an isolation and acid control method for ecological restoration of an oxidized ore waste rock field. Background technique [0002] The ecological restoration of oxidized ore waste rock sites is currently an extremely difficult ecological environmental problem to solve. The oxidized minerals are exposed to the air, coupled with natural leaching, fully contacted with air and water vapor, and catalyzed by iron ions and iron / sulfur oxidizing bacteria. Under the action, the oxidation reaction will occur rapidly to produce acid. The pollution of soil acidification and acid wastewater is extensive, serious and long-term. All countries in the world attach great importance to the research on the treatment of acidified solid waste. [0003] A commonly used method to control acidification is to add an acid neutralizer to eliminate the formed acidic substances and inhibit fu...

AI Technical Summary

Problems solved by technology

Secondly, because lime is slightly soluble in water, in a hot and rainy environment, the added lime may have been washed away by rainwater before most of the metal sulfides stored in the soil were fully oxidized, and then the soil began to acidify again. As a result, plants that have already grown are facing habitat threats

Furthermore, a large amount of limestone will also cause the deficiency of plant nutrients and various trace elements.

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