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Modified red mud and preparation method thereof

A red mud modification technology, applied in chemical instruments and methods, organic fertilizers, fertilizer mixtures, etc., can solve the problems of poor red mud treatment effect, unfavorable large-scale popularization and application, and large amount of phosphorus leaching, etc., and achieves a simple and convenient preparation method Easy to implement, conducive to large-scale promotion and application, and good application effect

Inactive Publication Date: 2012-08-01
重庆绿色智能技术研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although red mud has a certain fixing effect on phosphorus, it can be used to control the loss of phosphorus in the soil, but the treatment effect of direct application of red mud is poor, and the amount of phosphorus leached in the soil is large, which is not conducive to its large-scale application

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  • Modified red mud and preparation method thereof
  • Modified red mud and preparation method thereof

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preparation example Construction

[0031] The present invention also provides a preparation method of modified red mud, comprising the following steps:

[0032] Red mud, inorganic acid and water are mixed to obtain modified red mud after reaction.

[0033] The present invention mainly uses red mud and inorganic acid as raw materials, and uses water as solvent to prepare modified red mud. The modified red mud not only has better application effect in controlling phosphorus loss in soil, but also has a simple and convenient preparation method, and its price is low. , Conducive to environmental protection.

[0034] The present invention uses red mud as one of the raw materials. The red mud is a red muddy waste produced during the production process of extracting alumina from bauxite. It can play a role in fixing phosphorus in the soil to a certain extent.

[0035] According to different production methods of alumina, the red mud can be divided into sintering red mud, combined red mud and Bayer red mud. Among the...

Embodiment 1

[0050] Mix 1 kg of red mud with a particle size of less than 2 mm and 10 L of hydrochloric acid solution with a concentration of 0.5 mol / L, and react to obtain modified red mud.

[0051] After the modified red mud is obtained, it is uniformly mixed into the surface soil within 10cm of the long-term application of phosphorus fertilizer at the application rate of 10 tons / ha, 30 tons / ha, 50 tons / ha and 70 tons / ha, respectively. According to my country's environmental protection standard HJ 557-2010 "Solid Waste Leaching Toxicity Leaching Method Horizontal Oscillating Method", the phosphorus leaching experiment was carried out to evaluate the application effect of the obtained modified red mud to fix phosphorus in the soil. The experimental results show that the leaching amount of phosphorus in the soil is 4.59 mg / kg, 2.60 mg / kg, 1.83 mg / kg and 1.39 mg / kg respectively, the results are as shown in Table 1, and Table 1 is Example 1 of the present invention and Comparative Example The...

Embodiment 2～8

[0055] According to the ratio of the volume of the hydrochloric acid solution to the mass of the red mud is 10L:1kg, the concentration of the red mud with a particle size of less than 2mm is 0.01mol / L, 0.05mol / L, 0.1mol / L, 0.25mol / L, 0.5 mol / L, 1.0mol / L and 2.0mol / L hydrochloric acid solutions were mixed to obtain modified red mud respectively after reaction.

[0056] Put 0.05g of the obtained modified red mud into a 250mL conical flask, add 100.0mL potassium dihydrogen phosphate solution with a concentration of 5mg / L, and use 0.01mol / L potassium chloride solution as the electrolyte for batch experiments Solution, adjust the pH value with 1mol / L hydrochloric acid solution and 1mol / L sodium hydroxide solution, then place it in a constant temperature oscillator, and reciprocate at a speed of 160rpm for 4h under a constant temperature condition of 25±1°C, then shake it at a speed of 4000r / Centrifuge at a speed of 10 min for 10 min, take the supernatant, filter it with a 0.45 μm ...

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Abstract

The invention provides modified red mud, which is prepared by reacting red mud and inorganic acid in water. According to the modified red mud, the inorganic acid reacts with the red mud to remove substances which do not facilitate the fixing of phosphorus and are distributed in a red mud pore passage, so that the pore passage is dredged; and hydrogen ions with a small volume in the inorganic acid can replace cations among red mud layers, so that the pore passage is dredged further, the diffusion of the phosphorus in the red mud is facilitated, and the fixing of the phosphorus in soil is promoted further; and therefore, the loss of the phosphorus in the soil is controlled better. Experimental results show that when 10 tons of the modified red mud is applied to each hectare of soil, the leaching amount of the phosphorus in the soil is below 5 milligrams / kilogram, namely the modified red mud has a good application effect. In addition, the modified red mud is low in cost and environment-friendly; and the preparation method is simple, convenient and easy and facilitates large-scale popularization and application. The invention also provides a preparation method for the modified red mud.

Description

technical field [0001] The invention relates to the technical field of water pollution control, in particular to a modified red mud and a preparation method thereof. Background technique [0002] With the strengthening of environmental pollution control, the point source pollution of my country's water environment has been effectively controlled and treated, and the quality of the water environment has been improved to a certain extent, but the degree of improvement is generally not obvious. The reason is that after point source pollution has been effectively controlled, non-point source pollution has become a new source of pollution, especially the water environment pollution caused by agricultural non-point source pollution has not received more attention. For example, the use of phosphorus fertilizers in agriculture can promote crop growth , improve crop yield and quality, but continuous high application of phosphorus fertilizer will lead to excess phosphorus content in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08C09K101/00
Inventor 梁震徐愿坚刘志梅杨舒
Owner 重庆绿色智能技术研究院
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