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Passivator for cadmium in neutral soil and application method thereof

An application method and technology of passivation agents, applied in chemical instruments and methods, applications, soil conditioning materials, etc., can solve problems such as passivation agents that cannot be effectively polluted

Active Publication Date: 2014-05-21
HUNAN RES INST FOR NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a cadmium passivator in neutral soil and its application method, to solve the technical problem in the prior art that the passivator cannot effectively pollute the heavy metal cadmium in neutral soil

Method used

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  • Passivator for cadmium in neutral soil and application method thereof
  • Passivator for cadmium in neutral soil and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The neutral soil polluted by heavy metal cadmium from Shuikou Mountain in Hunan was air-dried and ground through a 2 mm sieve. Grind the charcoal to 1mm, weigh 0.42% CaO, 0.3% plaster of paris, 0.3% charcoal powder and mix with the soil according to the soil weight, pour 20ml of water, and shake for 2 hours to make it fully mixed , infiltrate, and let stand for 1 week. figure 1 This is the result of the treatment of soil available cadmium in this implementation case. Depend on figure 1 It can be seen that column 1 is the effective content of cadmium in the soil before using the cadmium passivator, which is 0.72 mg / kg. Column 2 is the effective content of cadmium in the soil after using the cadmium passivator, which is 0.28mg / kg. As shown in line 3, the pH value of the soil before and after treatment increased from 6.58 to 6.73. It shows that the passivating agent provided by the invention can effectively reduce the content of available cadmium in neutral soil, and a...

Embodiment 2

[0044] The neutral soil polluted by heavy metal cadmium from Shuikou Mountain in Hunan was air-dried and ground through a 2 mm sieve. Weigh 50g of sieved soil, grind the charcoal to 1mm, weigh in 0.34% CaO, 1.24% plaster of paris, 0.42% charcoal and mix with the soil according to the weight of the soil, pour 22ml of water, shake for 2 hours, make it fully mixed , infiltrate, and let stand for 1 week. figure 2 For this implementation case, the treatment effect on soil available cadmium. Depend on figure 2 It can be seen that column 4 is the effective content of cadmium in the soil before using the cadmium passivator, which is 0.72 mg / kg. Column 5 is the effective content of cadmium in the soil after using the cadmium passivator, which is 0.35 mg / kg. As shown in line 6, the pH value of the soil before and after treatment dropped from 6.58 to 6.47. It shows that the passivating agent provided by the invention can effectively reduce the content of available cadmium in neutra...

Embodiment 3

[0047] The neutral soil polluted by heavy metal cadmium from Shuikou Mountain in Hunan was air-dried, ground and passed through a 1 mm sieve. Take the soil under the sieve, weigh calcium oxide by soil weight 1.5%, weigh plaster of paris by soil weight 0.48%, take charcoal powder with a particle size of 3mm by soil weight 1.02%, drop into the soil respectively, and mix well to obtain mixture. Drizzle 35-50% of the volume of water into the mixture, vibrate for 2 hours, make it fully mixed, infiltrate, and let stand for 5 days. The effective content of cadmium in the soil before using the cadmium passivator is 0.72mg / kg. The effective content of cadmium in soil after using cadmium passivator is 0.25mg / kg. After treatment, the soil pH value rose from 6.66 to 6.92. It shows that the passivating agent provided by the invention can effectively reduce the content of available cadmium in neutral soil, and at the same time maintain the stability of the pH value of the soil, and the e...

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Abstract

The invention provides a passivator for cadmium in neutral soil and an application method thereof. The passivator is composed of calcium oxide with a weight accounting for 0.3-2.0% of the weight of neutral soil, calcium dithionate monohydrate with a weight accounting for 0.3-2.5% of the weight of the neutral soil, and charcoal with a weight accounting for 0.3-1.34% of the weight of the neutral soil. The passivator for cadmium in neutral soil provided by the invention reacts with effective cadmium in the neutral soil by using calcium oxide and calcined gypsum (calcium dithionate monohydrate) so as to generate small-activity cadmium sediments such as cadmium hydroxide and the like, and charcoal and the like in the passivator can selectively adsorb cadmium ions with large activity in the soil so as to reduce the transportability of the cadmium ions, therefore, an effect of reducing the quantity of effective-state cadmium in the neutral soil is achieved, the restoration of contaminated soil is implemented, and a situation that the pH value of the soil before and after the soil is treated is not changed can be ensured.

Description

technical field [0001] The invention relates to the field of degradation of heavy metal cadmium pollution, in particular to a cadmium passivator in neutral soil, and another aspect of the invention also provides an application method of the passivator. Background technique [0002] With the development of industry, cadmium is widely used in industrial production. Some enterprises discharge production wastewater at will. Before the cadmium-containing wastewater penetrates into the groundwater layer, it needs to pass through a large amount of soil layer. The soil layer absorbs cadmium in the wastewater and purifies the wastewater. But the soil is also polluted. In recent years, poisonous rice incidents have occurred frequently, and the cadmium in rice mainly comes from the available cadmium in the soil where rice is grown. When the cadmium content in the soil where rice is grown exceeds the standard, the rice absorbs excessive cadmium and eventually accumulates in the rice se...

Claims

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Application Information

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IPC IPC(8): C09K17/06
Inventor 黄顺红李倩陈伟袁翠玉徐溢万斯王兵彭新平孙建德欧阳坤万文玉朱安玲尹柳娟曹柏林
Owner HUNAN RES INST FOR NONFERROUS METALS
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