Soil improver suitable for ecological restoration of mines in arid areas and its preparation and application method

Abstract

The invention discloses a soil conditioner applied to mine ecological restoration in an arid region as well as preparation and application methods thereof. The soil conditioner is prepared from the following raw materials: potassium polyacrylate, decomposed coal, biological potassium fulvate of sugar factory byproducts, natural zeolite powder and a compound microbial agent. The preparation method comprises the following steps: uniformly mixing the potassium polyacrylate, decomposed coal, biological potassium fulvate and natural zeolite powder in parts by weight; and adding water and diluting the compound microbial agent according to a ratio of 1:100, uniformly spraying, uniformly mixing again, and balancing for 10-20 days. The soil conditioner can be used for soil replacement covering engineering for repairing flat slope surface or slope surface with gentle slope in mining area and also can be used for ecological bag slope repair engineering for repairing soil sediment slope surface in mining area with steep slope and poor soil conditions. The soil conditioner can achieve the effects of obviously improving the plant emergence rate, improving water and nutrient conditions, improving physical and chemical properties of soil, increasing soil activity, accelerating the soil-ripening process and promoting vegetation growth.

Description

technical field [0001] The invention relates to an ecological restoration technology, in particular to a soil improver suitable for ecological restoration of mines in arid areas and a preparation and application method. Background technique [0002] (1) Current status of ecological problems in mines in arid areas: [0003] According to the mine geological environment investigation and assessment results of the China Geological Survey Bureau: by the end of 2005, more than 4,500 ground subsidences and more than 1,000 landslides were caused by mining in mines across the country. A total of 1.439 million hectares of land was occupied and destroyed by mining activities across the country. Therefore, mine ecological restoration is an urgent problem to be solved in the sustainable development of the national economy. During the mining process, abandoned mine pits, dumps, tailings ponds, and subsidence areas have brought serious ecological and environmental problems. The structure...

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Problems solved by technology

The surface soil has a great influence on the growth of plants. Generally, in mine restoration, due to the thin soil layer, poor conditions, accumulation of slag and heavy metal pollution in mine dumps and abandoned mine pits, surface soil backfilling is a kind of The most commonly used and most effective measures, but it involves topsoil collection, storage, secondary soil dumping, etc., which requires a large amount of engineering, high costs, and damage to scarce land resources

Chemical improvement technology improves the pH of mine soil by applying chemical substances and increasing soil fertility by applying fertilizers, which has a significant impact on vegetation restoration. However, the effect of chemical fertilizers is short-term and requires long-term human and material resources input and maintenance; urban sludge improvement is the current research One hotspot is that urban sludge is rich in organic matter, which is good for plants to absorb nutrients, but because it contains a lot of heavy metals and other pollutants, it may cause secondary pollution; in biological improvement technology, earthworms, algae and microorganisms are usually used to Significantly improve the physical and chemical properties of the soil, accelerate the soil maturation process, and at the same time select the appropriate plant configuration to speed up the greening and restoration of the mine. In addition, the inoculation technology such as fungal mycorrhiza is used in mine restoration, which is effective for soil improvement, but the site conditions in arid areas are harsh In some cases, biotechnology is limited and the effect is slow

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