Soil restoring agent with heavy metal ion adsorption and immobilization functions, and preparation method thereof

Abstract

The invention provides a soil restoring agent with heavy metal ion adsorption and immobilization functions, and a preparation method thereof. The raw material formula of the soil restoring agent comprises 60-80 parts of waste soil obtained after oil decolorizing and waste white clay oil extraction, 2-5 parts of a sulfur-containing compound, 8-15 parts of aluminum magnesium silicate and 10-20 parts of humic acid. The preparation method of the soil restoring agent comprises the following steps: 1, reacting the waste soil with the sulfur-containing compound at 500-700DEG C to obtain sulfenyl group-containing modified soil with an octahedral structure; and 2, mixing the modified soil with aluminum magnesium silicate and humic acid to obtain the soil restoring agent. The soil restoring agent has the advantages of recycling of the waste white clay, excellent heavy metal ion adsorption and immobilization functions, high added values, simple preparation and low cost.

Description

technical field

[0001] The invention relates to the technical field of soil restoration, in particular to a soil restoration agent capable of absorbing and fixing heavy metal ions. Background technique

[0002] Soil pollution has become a worldwide problem, and heavy metal pollution has become the "invisible killer" of my country's agricultural products. Excessive use of chemical fertilizers will cause soil acidification, which in turn will induce an increase in the activity of heavy metal ions in the soil. Every time the soil pH value drops by one unit, the activity of heavy metal cadmium will increase by 100 times, which will increase the risk of diseases such as bone pain disease. "The biggest characteristics of agricultural non-point source pollution are concealment, long-term and scattered nature. It is consciously or unconsciously produced in every process of agricultural production, and it is more troublesome to deal with. According to preliminary statistics, about 1...

Examples

Embodiment 1

[0027] A kind of soil remediation agent, is prepared through the following steps:

[0028] 1) Put 70 parts of waste soil at 600°C to roast for 0.5h, add 3 parts of calcium polysulfide, and react for 2h to obtain modified soil;

[0029] 2) Stir and mix the modified soil body obtained in step 1) with 12 parts of magnesium aluminum silicate and 15 parts of soil humic acid, and finally grind it into granules to obtain a soil remediation agent.

[0030] The appearance of the soil remediation agent is gray-black granular solid, and the pH is 8.20 when the solid-liquid ratio is 1:2.5.

Embodiment 2

[0032] A kind of soil remediation agent, is prepared through the following steps:

[0033] 1) Put 70 parts of waste soil at 600°C to roast for 0.6 hours, add 5 parts of calcium polysulfide, and react for 2 hours to obtain modified soil;

[0034] 2) Stir and mix the modified soil body obtained in step 1) with 8 parts of magnesium aluminum silicate and 20 parts of soil humic acid, and finally grind it into granules to obtain a soil remediation agent.

[0035] The appearance of the soil remediation agent is gray-black granular solid, and the pH is 8.50 when the solid-liquid ratio is 1:2.5

Embodiment 3

[0037] A kind of soil remediation agent, is prepared through the following steps:

[0038] 1) Put 80 parts of waste soil at 600°C and roast for 0.5h, add 2 parts of sodium polysulfide, and react for 2h (time) to obtain modified soil;

[0039] 2) Stir and mix the modified soil body obtained in step 1) with 15 parts of magnesium aluminum silicate and 10 parts of soil humic acid, and finally grind it into granules to obtain a soil remediation agent.

[0040] The appearance of the soil remediation agent is gray-black granular solid, and the pH is 8.10 when the solid-liquid ratio is 1:2.5.

technical field

[0001] The invention relates to the technical field of soil restoration, in particular to a soil restoration agent capable of absorbing and fixing heavy metal ions. Background technique

[0002] Soil pollution has become a worldwide problem, and heavy metal pollution has become the "invisible killer" of my country's agricultural products. Excessive use of chemical fertilizers will cause soil acidification, which in turn will induce an increase in the activity of heavy metal ions in the soil. Every time the soil pH value drops by one unit, the activity of heavy metal cadmium will increase by 100 times, which will increase the risk of diseases such as bone pain disease. "The biggest characteristics of agricultural non-point source pollution are concealment, long-term and scattered nature. It is consciously or unconsciously produced in every process of agricultural production, and it is more troublesome to deal with. According to preliminary statistics, about 1...

Examples

Embodiment 1

[0027] A kind of soil remediation agent, is prepared through the following steps:

[0028] 1) Put 70 parts of waste soil at 600°C to roast for 0.5h, add 3 parts of calcium polysulfide, and react for 2h to obtain modified soil;

[0029] 2) Stir and mix the modified soil body obtained in step 1) with 12 parts of magnesium aluminum silicate and 15 parts of soil humic acid, and finally grind it into granules to obtain a soil remediation agent.

[0030] The appearance of the soil remediation agent is gray-black granular solid, and the pH is 8.20 when the solid-liquid ratio is 1:2.5.

Embodiment 2

[0032] A kind of soil remediation agent, is prepared through the following steps:

[0033] 1) Put 70 parts of waste soil at 600°C to roast for 0.6 hours, add 5 parts of calcium polysulfide, and react for 2 hours to obtain modified soil;

[0034] 2) Stir and mix the modified soil body obtained in step 1) with 8 parts of magnesium aluminum silicate and 20 parts of soil humic acid, and finally grind it into granules to obtain a soil remediation agent.

[0035] The appearance of the soil remediation agent is gray-black granular solid, and the pH is 8.50 when the solid-liquid ratio is 1:2.5

Embodiment 3

[0037] A kind of soil remediation agent, is prepared through the following steps:

[0038] 1) Put 80 parts of waste soil at 600°C and roast for 0.5h, add 2 parts of sodium polysulfide, and react for 2h (time) to obtain modified soil;

[0039] 2) Stir and mix the modified soil body obtained in step 1) with 15 parts of magnesium aluminum silicate and 10 parts of soil humic acid, and finally grind it into granules to obtain a soil remediation agent.

[0040] The appearance of the soil remediation agent is gray-black granular solid, and the pH is 8.10 when the solid-liquid ratio is 1:2.5.