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A method for preventing dust and environmental pollution from red mud stockpile

A technology of red mud and storage yards, which is applied in the field of prevention and control of environmental pollution in red mud storage yards, can solve problems such as soil and groundwater pollution, dust, etc., and achieve the effect of reducing environmental pollution risks and broad application prospects

Active Publication Date: 2017-10-10
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve environmental problems such as dust, soil and groundwater pollution caused by the large amount of red mud storage in the existing combined method, and to provide a method for preventing and controlling dust and environmental pollution in the red mud storage yard

Method used

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  • A method for preventing dust and environmental pollution from red mud stockpile
  • A method for preventing dust and environmental pollution from red mud stockpile
  • A method for preventing dust and environmental pollution from red mud stockpile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Greenhouse pot experiment: add 60g of green alum to 2000g of crushed combined red mud, add 0.805L of water, stir well until it becomes a uniform slurry, then add 100g of nitrohumic acid, and stir again until it becomes a uniform slurry , Natural aging for 30 days. Take a small amount for chemical analysis (see Table 2 for the results), and use the rest for cultivation experiments. Lay 5cm thick vinegar residue on the bottom of the flowerpot, and sprinkle the improved red mud on the vinegar residue after aging, and then sow 20 seeds of Caragana korshinskii after the zinc phosphide dressing, watering every 10 days One time, the amount of watering is 700ml each time, the seed germination rate is 60%, and the growth is very good.

[0061] Table 2 The basic physical and chemical properties of red mud and the leaching concentration of harmful substances (mg / kg) at the lowest addition amount (3%)

[0062]

Embodiment 2

[0064] Greenhouse pot experiment: add 200g of green alum to 2000g of crushed combined red mud, add 1.04L of water, stir well until it becomes a uniform slurry, then add 400g of nitrohumic acid, and stir again until it becomes a uniform slurry , Natural aging for 30 days. Take a small amount for chemical analysis (see Table 3 for the results), and use the rest for cultivation experiments. Lay 5cm thick vinegar residue on the bottom of the flowerpot, and sprinkle the improved red mud on the vinegar residue after aging, and then sow 20 seeds of Caragana korshinskii after the zinc phosphide dressing, watering every 10 days The watering amount is 700ml each time, the germination rate of seeds is 90%, and the growth is very good.

[0065] Table 3 The basic physical and chemical properties of red mud and the leaching concentration of harmful substances (mg / kg) at the highest addition amount (10% and 20%)

[0066]

Embodiment 3

[0068] Soil column simulation experiment: add 60g of green vitriol to 2000g of crushed combined red mud, add 1.484L of water, stir thoroughly until it becomes a uniform slurry, then add 100g of nitrohumic acid, and stir again until it becomes a uniform slurry After 30 days of natural aging, fill the bottom of the 100cm high soil column with 50cm thick combined red mud, cover the surface of the red mud with 5cm thick gravel, and bury the water filter tube in the coarse sand at a certain dump angle (One end of the filter pipe protrudes from the sampling port on the side wall of the soil column), and then fill with 5cm thick fine gravel. Cover the surface of fine gravel with 10cm thick vinegar residue, and finally cover the vinegar residue with 10cm thickness of the improved combined red mud, and then sow 20 seeds of Caragana korshinskii after zinc phosphide dressing, every 10 Water once every day, and the watering amount is 200ml each time, the seed germination rate is 55%, and t...

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Abstract

The invention provides a method for preventing red mud stacking field from dust and environment pollution. The method includes: using copperas and nitro humic acid to improve combined red mud, wherein the addition amount of the copperas is 3%-10% of the dry weight of the combined red mud, the addition amount of the nitro humic acid is 5%-20% of the dry weight of the combined red mud, the moisture content of the combined red mud is adjusted to 40%-70%, the combined red mud is fully stirred, and then natural ageing is performed for more than 10 days, and the combined red mud has the basic condition of plant growth; reducing influence of salt returning and alkali returning phenomena in the actual situation on plant growth by arranging a drainage layer and a butter layer between the improved combined red mud and red mud in the lower layer of the stacking field, wherein the thickness of the drainage layer and the buffer layer is greater than 10 cm, the drainage layer includes inclined water filtering pipes, a rough gravel layer and a fine gravel layer, and the buffer layer adopts an acid material having excellent water-retaining property and covers the drainage layer; and evenly paving the improved combined red mud on the buffer layer, and planting a saline-alkali tolerant plant caragana microphylla after the substrate is aged and stable.

Description

Technical field [0001] The invention relates to a method for preventing and controlling fugitive dust and environmental pollution in a red mud yard, and belongs to the technical field of methods for preventing and controlling environmental pollution in a red mud yard. Background technique [0002] Red mud is a high-alkali and high-salt waste produced in the alumina production process. For every ton of alumina produced, 1 to 2 tons of red mud are produced. As the world's fourth largest alumina producer, China discharges up to 7 million tons of red mud each year. The long-term storage of red mud not only occupies a large amount of land and valuable farmland, but also pollutes the ecological environment. The main components of red mud are CaO and Fe 2 O 3 , Al 2 O 3 , Na 2 O, etc., the pH value is between 10-12, and the particle size is mostly less than 63μm. The dust pollution caused by migration with the wind greatly harms the surrounding crops, building surfaces, soil and human ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01B79/02A01G17/00A01G9/10C09K17/40C09K101/00
CPCA01B79/02A01G17/005A01G24/00C09K17/40C09K2101/00
Inventor 任杰杜平刘继东陈娟刘小莲杨宾李发生
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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