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Use of desulfurized waste material of coal-burning smoke and method for modifying alkali soil by same

A technology for desulfurizing waste and improving soil, applied in the field of soil improvement, can solve problems affecting the effect of improvement, achieve good social and economic benefits, restore ecological vegetation, and solve pollution effects

Active Publication Date: 2007-08-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the predecessors used gypsum to improve the soil, the calculation of the amount of gypsum mainly considered the difference between the exchangeable sodium minus 5% or 10% of the degree of alkalization, which was used as the basis for the amount of gypsum. For Na 2 CO 3 , NaHCO 3 , when the amount is large, it will be included in the amount of gypsum applied, and if it is small, it will be ignored, and the exchangeable magnesium will not be included in the calculation. In this way, the amount of gypsum applied will be less than the amount required for actual improvement, which will affect the effect of improvement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Slightly alkalized soil: For soil with an alkalization degree of 10%, using the above method, the application rate of flue gas desulfurization waste is 1212 kg / mu, the plowing depth is 20cm, and the irrigation water volume is controlled at 150 cubic meters / mu, 2003 The annual planting crop is grain corn, the variety is Zhedan 7, the sowing rate is 1.75 kg / mu, and the sowing date is May 1-3. The emergence rate of the year was 100%, and the grain yield was 584 kg / mu, which was 60.4% higher than that of the control area. For the reduction degree of 17%, using the above method, the application rate of flue gas desulfurization waste is 1500 kg / mu, the plowing depth is 20cm, the crop planted in 2003 is grain corn, the variety is Zhedan 7, and the sowing rate is 1.75 kg / mu, the sowing date is May 1-3. The emergence rate was 100%, and the grain yield was 621 kg / mu, which was 70% higher than that in the control area.

Embodiment 2

[0030] Moderately alkalized soil: For the soil with a reduction degree of 20%, using the above method, the application rate of flue gas desulfurization waste is 1560 kg / mu, the plowing depth is 20cm, and the irrigation water volume is controlled at 200 cubic / mu, in 2003 The planted crop is grain corn, the variety is Zhedan 7, the sowing rate is 1.75 kg / mu, and the sowing date is May 1-3. The emergence rate of the year was 100%, and the grain yield was 748 kg / mu, which was 67% higher than that of the control area. For the soil with an alkalinity of 28%, using the above method, the application rate of flue gas desulfurization waste is 2067 kg / mu, and the plowing depth is 20cm. It is 1.75 kg / mu, and the sowing date is May 1-3. The emergence rate of the year was 100%, and the grain yield was 848 kg / mu, which was 90% higher than that of the control area.

Embodiment 3

[0032] Severely alkalized soil: For soil with an alkalization degree of about 32%, using the above method, the application rate of flue gas desulfurization waste is 2230 kg / mu, the plowing depth is 20cm, and the irrigation water volume is controlled at 100 cubic meters / mu, in 2003 The planted crop is grain corn, the variety is Zhedan 7, the sowing rate is 1.75 kg / mu, and the sowing date is May 1-3. The emergence rate of the year was 93%, and the grain yield was 751 kg / mu, while the grain yield in the control area was only 41.4 kg / mu. For the soil with a reduction degree of 79%, the application rate of flue gas desulfurization waste is 4708 kg / mu, and the plowing depth is 40 cm. The crop planted in 2003 is grain corn, the variety is Zhedan No. mu, the sowing date is May 1-3. The emergence rate of the year was 88%, and the grain yield was 492 kg / mu, while the grain yield in the control area was only 41.4 kg / mu.

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PUM

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Abstract

This invention relates to a new usage of desulfurized wastes of coal smoke and a method for improving alkali earth, in which, the method includes: sampling an earth-sample to test it and computing the volume of Na2CO3, NaHCO3, Mg(HCO3)2,+)Na and Mg, computing the mol volume of CaSO4 necessary for the reform then computing the necessary volume for getting the smoke desulfurized wastes based on their composition to spread the wastes on the earth's surface and irrigate it and applying the field management measure same to the ordinary earth.

Description

technical field [0001] The invention relates to the use of coal-fired flue gas desulfurization waste and a soil improvement technology, in particular to a method for improving alkaline soil by using coal-fired flue gas desulfurization waste, which belongs to the technical field of soil improvement. Background technique [0002] The main component of coal-fired flue gas desulfurization waste is gypsum (CaSO 4 2H 2 O) or its combination with calcium sulfite (CaSO 3 ), and a certain amount of fly ash and water. Pure calcium sulfate (gypsum) is a common building material; while calcium sulfite is waste, and because of its instability, it is easy to cause secondary pollution to the environment. In fact, since our country is a country rich in natural gypsum, the price is low; there is no need to use the gypsum containing a large amount of water and ash and other impurities generated after flue gas desulfurization, and use it directly as building gypsum, because it requires a lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/02B09B3/00
Inventor 陈昌和徐旭常定方正毅乌力更王淑娟新田义孝李跃进松本聰李彦
Owner TSINGHUA UNIV
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