CN106381153A - Soil passivating agent used for repairing heavy metal soil and preparation method thereof - Google Patents

Abstract

The invention discloses a soil passivating agent used for repairing heavy metal soil. The soil passivating agent comprises the following components in parts by weight: 60-80 parts of humic acid, 30-40 parts of calcium phosphate, 20-40 parts of red mud, 20-30 parts of lime, 30-50 parts of diammonium phosphate, 30-40 parts of sodium alginate and 20-50 parts of Chinese medical stone. The invention also discloses a preparation method of the soil passivating agent. Compared with the prior art, the time consuming for soil restoration is less, normal production of the grains cannot be influenced; the problem of soil micronutrient element deletion due to long-term usage of the passivating agent is solved; the method is simple and easy to carry out, massive manpower resource cannot be required; a current soil restoration technology is fully used, and the heavy metal in the soil is removed.

Description

A kind of soil passivator for remediating heavy metal soil and preparation method thereof

Technical field

The invention belongs to agriculture field is and in particular to a kind of soil passivator for remediating heavy metal soil and its preparation Method.

Background technology

In China existing about 1 × 108hm2 arable land, there are about 1/5 and be subject to different degrees of polluting, cause grain to subtract every year Product reaches 2.5 × 109kg, and agriculture total losses amount reaches more than 1 × 1011 yuan every year.Meanwhile, the dirts such as the heavy metal that soil pollution causes Dye thing content overproof, and be enriched in human body and animal by food, endanger human and livestock health, cause human cancer and other diseases Deng.

China's soil restoring technology research is started late, regional development lack of uniformity in addition, soil types multiformity, pollution Site characteristic variability, pollution type complexity, the factor such as technical need multiformity, mainly based on phytoremediation.Plant is repaiied The farmland of recovering technology repairing heavy metal pollution is excessively single, and time-consuming for reparation, can affect grain normal production cycles.

Content of the invention

Goal of the invention：Present invention aims to the deficiencies in the prior art, provide a kind of native for remediating heavy metal The soil passivator of earth.

Another object of the present invention is to providing the preparation method of above-mentioned soil passivator.

Technical scheme：In order to reach foregoing invention purpose, the present invention is specifically achieved like this：One kind is used for repairing weight The soil passivator of metal soil, including the component of following parts by weight：60 ~ 80 parts of humic acid, 30 ~ 40 parts of calcium phosphate, 20 ~ 40 parts of red mud, 20 ~ 30 parts of Calx, 30 ~ 50 parts of diammonium phosphate, 30 ~ 40 parts of sodium alginate and 20 ~ 50 parts Maifanitum.

The method preparing the soil passivator for remediating heavy metal soil, comprises the following steps：

（1）By calcium phosphate, red mud, Maifanitum is pulverized and mixed；

（2）By humic acid, Calx, diammonium phosphate, sodium alginate adds in step 1 mixture, continuously stirred 20 ~ 30 minutes；

（3）In 40 ~ 50 degrees Celsius of lower baking step 2 gained mixture, and gained drying object is sieved, powdery dress wraps into storehouse.

Wherein, after in described step 3, drying object is sieved, Task-size Controlling is below 200 mesh.

Beneficial effect：Compared with conventional art, rehabilitating soil takes less the present invention, does not affect the normal production of grain； Solve the problems, such as that life-time service passivator causes the disappearance of soil micronutrient element；Method is simple to operation, need not put into big The human resourcess of amount；Make full use of existing soil restoring technology, remove the heavy metal in soil.

Specific embodiment

Embodiment 1：

Parts by weight are 30 parts of calcium phosphate, 20 parts of red muds, 20 parts of Maifanitums are pulverized and mixed；Then by 60 parts of humic acid, 20 parts Calx, 30 parts of diammonium phosphate, 30 parts of sodium alginates add and mix, continuously stirred 20 ~ 30 minutes；Dry under 40 ~ 50 degrees Celsius Dry gained mixture, and gained drying object is sieved, powdery dress wraps into storehouse.

Embodiment 2：

Parts by weight are 40 parts of calcium phosphate, 40 parts of red muds, 50 parts of Maifanitums are pulverized and mixed；Then by 80 parts of humic acid, 30 parts Calx, 50 parts of diammonium phosphate, 40 parts of sodium alginates add and mix, continuously stirred 20 ~ 30 minutes；Dry under 40 ~ 50 degrees Celsius Dry gained mixture, and gained drying object is sieved, powdery dress wraps into storehouse.

Embodiment 3：

Parts by weight are 35 parts of calcium phosphate, 30 parts of red muds, 30 parts of Maifanitums are pulverized and mixed；Then by 70 parts of humic acid, 25 parts Calx, 40 parts of diammonium phosphate, 35 parts of sodium alginates add and mix, continuously stirred 20 ~ 30 minutes；Dry under 40 ~ 50 degrees Celsius Dry gained mixture, and gained drying object is sieved, powdery dress wraps into storehouse.

Embodiment 4：

Parts by weight are 30 parts of calcium phosphate, 25 parts of red muds, 40 parts of Maifanitums are pulverized and mixed；Then by 6 parts of humic acid, 30 parts of stones Ash, 35 parts of diammonium phosphate, 30 parts of sodium alginates add and mix, continuously stirred 20 ~ 30 minutes；Dry under 40 ~ 50 degrees Celsius Gained mixture, and gained drying object is sieved, powdery dress wraps into storehouse.

Embodiment 5：

Parts by weight are 40 parts of calcium phosphate, 35 parts of red muds, 45 parts of Maifanitums are pulverized and mixed；Then by 75 parts of humic acid, 20 parts Calx, 45 parts of diammonium phosphate, 40 parts of sodium alginates add and mix, continuously stirred 20 ~ 30 minutes；Dry under 40 ~ 50 degrees Celsius Dry gained mixture, and gained drying object is sieved, powdery dress wraps into storehouse.

Claims (3)

1. a kind of soil passivator for remediating heavy metal soil is it is characterised in that include the component of following parts by weight：60 ~ 80 parts of humic acid, 30 ~ 40 parts of calcium phosphate, 20 ~ 40 parts of red mud, 20 ~ 30 parts of Calx, 30 ~ 50 parts of phosphoric acid hydrogen two Ammonium, the Maifanitum of 30 ~ 40 parts of sodium alginate and 20 ~ 50 parts.

2. the method preparing soil passivator for remediating heavy metal soil is it is characterised in that comprise the following steps：

（1）By calcium phosphate, red mud, Maifanitum is pulverized and mixed；

（2）By humic acid, Calx, diammonium phosphate, sodium alginate adds in step 1 mixture, continuously stirred 20 ~ 30 minutes；

（3）In 40 ~ 50 degrees Celsius of lower baking step 2 gained mixture, and gained drying object is sieved, powdery dress wraps into storehouse.

3. the method for the soil passivator for remediating heavy metal soil according to claim 2 is it is characterised in that described After in step 3, drying object is sieved, Task-size Controlling is below 200 mesh.