Soil heavy metal passivator as well as preparation method and application thereof

A heavy metal passivator and soil technology, applied in the field of soil remediation, can solve the problems of large amount of passivator application, soil structure damage, complex components, etc., achieve excellent heavy metal activity, reduce heavy metal absorption, and not damage the soil structure Effect

Pending Publication Date: 2020-09-15
INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the relatively large amount of passivating agent containing bone meal in the prior art, the high cost, comp

Method used

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  • Soil heavy metal passivator as well as preparation method and application thereof
  • Soil heavy metal passivator as well as preparation method and application thereof
  • Soil heavy metal passivator as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Present embodiment provides a kind of soil heavy metal deactivator, and its composition is:

[0039] 75kg of carbonized bone powder; 30kg of metal salt antagonists, including 20kg of manganese chloride and 10kg of ferrous sulfate; 50kg of solid alkali, including 25kg of slaked lime and 25kg of plant ash.

[0040] The preparation method of described soil heavy metal deactivator is:

[0041] Commercially available bone meal (bone meal for feed that meets the requirements of the "GB / T 20193-2006 Feed Bone Meal and Meat and Bone Meal" standard) was subjected to low-temperature carbonization under nitrogen conditions. The carbonization temperature was 600°C, the carbonization time was 2 hours, and the nitrogen flow rate was 3.0 L / min, obtain carbonized bone meal;

[0042] Dissolve the metal antagonist in 90kg of water, then mix evenly with carbonized bone meal, dry at 90°C for 6 hours, and then mix evenly with solid base to obtain a soil heavy metal passivator.

Embodiment 2

[0044] Present embodiment provides a kind of soil heavy metal deactivator, and its composition is:

[0045] 33kg of carbonized bone powder; 7kg of metal salt antagonists, including 3kg of zinc sulfate and 4kg of magnesium chloride; 10kg of solid alkali, including 5kg of slaked lime and 5kg of limestone.

[0046] The preparation method of described soil heavy metal deactivator is:

[0047] Carry out low-temperature carbonization of commercially available bone meal (bone meal for feed that conforms to the standard requirements of "GB / T 20193-2006 Feed Bone Meal and Meat and Bone Meal") under nitrogen. The carbonization temperature is 300°C, the carbonization time is 5 hours, and the nitrogen flow rate is 0.5 L / min, obtain carbonized bone meal;

[0048] The metal antagonist was dissolved in 7kg of water, then mixed evenly with carbonized bone meal, dried at 70°C for 6 hours, and then mixed evenly with solid base to obtain a soil heavy metal passivator.

Embodiment 3

[0050] Present embodiment provides a kind of soil heavy metal deactivator, and its composition is:

[0051] 60kg of carbonized bone powder; 23kg of metal salt antagonists, including 10kg of manganese sulfate, 8kg of ferric chloride, and 5kg of calcium chloride; 40kg of solid alkali, including 40kg of quicklime.

[0052] The preparation method of described soil heavy metal deactivator is:

[0053] Commercially available bone meal (bone meal for feed that meets the requirements of the "GB / T 20193-2006 Feed Bone Meal and Meat and Bone Meal" standard) was subjected to low-temperature carbonization under nitrogen conditions. The carbonization temperature was 600°C, the carbonization time was 2 hours, and the nitrogen flow rate was 3.0 L / min, obtain carbonized bone meal;

[0054] Dissolve the metal antagonist in 46kg of water, then mix evenly with the carbonized bone powder obtained by the above method, dry at 80°C for 6 hours, and then mix evenly with solid alkali to obtain a soil...

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Abstract

The invention belongs to the technical field of soil remediation, and particularly relates to a soil heavy metal passivator and a preparation method and an application thereof. The soil heavy metal passivator comprises the following components in parts by weight: 33-75 parts of carbonized bone meal; 7-30 parts of a metal salt antagonist; and 10 to 50 parts of solid alkali. The passivator takes thecarbonized animal bone meal and the metal salt antagonist as main components, the raw materials are cheap and easy to obtain, and mineral nutrients such as phosphorus and calcium can be provided forsoil; solid alkali is added as a precipitant of the metal salt antagonist, so that rapid dissolution and loss of metal salt are avoided, the purpose of persistently releasing metal antagonist ions isachieved, and the heavy metal absorption amount of crops is further reduced.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a soil heavy metal passivator and its preparation method and application. Background technique [0002] In recent years, with the development of industry and the extensive use of agricultural inputs, the world is facing more and more serious soil environmental safety issues, among which heavy metal pollution has received the most attention. Restricted by the current scientific level, the heavy metal pollutants entering the soil cannot be separated from the soil simply and quickly. For the treatment of polluted soil, the passivation / stabilization method is mainly used at present, that is, the total amount of heavy metals in the soil is not reduced, but the mobility and bioavailability of pollutants are reduced by technical means, so as to curb their impact and ecological risk . [0003] Efficient, cheap, and environmentally friendly passivation materials are...

Claims

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Application Information

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IPC IPC(8): C09K17/06C09K101/00
CPCC09K17/06C09K2101/00
Inventor 谢杰董爱琴陈院华徐昌旭苏金平李建国范芳杨涛陈霞胡美蓉张丽芳王于娟
Owner INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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