Method for preventing red mud stacking field from dust and environment pollution

A technology for red mud and storage yard is applied in the field of preventing and controlling the environmental pollution of red mud storage yard, which can solve the problems of soil and groundwater pollution, fugitive dust, etc., and achieve the effect of reducing the risk of environmental pollution and having broad application prospects.

Active Publication Date: 2016-10-26
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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  • Method for preventing red mud stacking field from dust and environment pollution
  • Method for preventing red mud stacking field from dust and environment pollution
  • Method for preventing red mud stacking field from dust and environment pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Greenhouse pot experiment: Add 60g of green vitriol to 2000g of crushed combined red mud, add 0.805L of water, fully stir until it becomes a uniform slurry, then add 100g of nitro humic acid, and stir again until it becomes a uniform slurry , natural aging for 30 days. A small amount was taken for chemical analysis (the results are shown in Table 2), and the rest was used for cultivation experiments. Lay 5cm thick vinegar residue on the bottom of the flower pot, spread the aged and improved combined red mud on the vinegar residue, then sow 20 Caragana seeds after dressing with zinc phosphide, and water every 10 days Once, the amount of watering each time is 700ml, 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 minimum addition amount (3%)

[0062]

Embodiment 2

[0064] Greenhouse pot experiment: Add 200g of green vitriol to 2000g of crushed combined red mud, add 1.04L of water, fully stir until it becomes a uniform slurry, then add 400g of nitro humic acid, and stir again until it becomes a uniform slurry , natural aging for 30 days. A small amount was taken for chemical analysis (the results are shown in Table 3), and the rest was used for cultivation experiments. Lay 5cm thick vinegar residue on the bottom of the flower pot, spread the aged and improved combined red mud on the vinegar residue, then sow 20 Caragana seeds after dressing with zinc phosphide, and water every 10 days Once, the amount of watering each time is 700ml, the seed germination rate 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) under 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 process red mud, add 1.484L of water, fully stir until it becomes a uniform slurry, then add 100g of nitro humic acid, and stir again until it becomes a uniform slurry After natural aging for 30 days, 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 coarse gravel, and bury the filter pipe in the coarse sand at a certain pouring angle (One end of the filter pipe stretches out from the sampling port on the side wall of the soil column), and then fill in 5cm thick fine gravel. Evenly cover the 10cm thick vinegar residue on the surface of the fine gravel, and finally cover the improved combined red mud on the vinegar residue with a thickness of 10cm, and then sow 20 Caragana seeds after zinc phosphide seed dressing, every 10 Watering once a day, the amount of watering each time is 200ml, the seed germination ...

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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 dust and environmental pollution in red mud storage yards, and belongs to the technical field of methods for preventing and controlling environmental pollution in red mud storage yards. Background technique [0002] Red mud is a waste with high alkali and high salt characteristics produced in the alumina production process. For every ton of alumina produced, 1 to 2 tons of red mud will be produced. As the world's fourth largest producer of alumina, China discharges up to 7 million tons of red mud every year. The long-term stockpiling of red mud not only occupies a large amount of land and valuable farmland, but also pollutes the ecological environment that cannot be ignored. The main components of red mud are CaO, Fe 2 o 3 、Al 2 o 3 、Na 2 O, etc., the pH value is between 10 and 12, and the particle size is mostly less than 63 μm. The dust pollution caused by its migration with the w...

Claims

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Application Information

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Patent Type & Authority Applications(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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