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CN-121975528-A - Mineral source nitro humic acid-desulfurized gypsum soil conditioner and preparation method thereof

CN121975528ACN 121975528 ACN121975528 ACN 121975528ACN-121975528-A

Abstract

The invention provides a mineral source nitro humic acid-desulfurized gypsum soil conditioner, wherein the mass ratio of the mineral source nitro humic acid to the desulfurized gypsum is (50-150): 100, and the particle diameter of the mineral source nitro humic acid is 60-100 meshes. The invention adopts the combination of the mineral source nitro humic acid and the desulfurization gypsum to prepare the soil conditioner, which can avoid the consequences of cation exchange limitation, crop growth inhibition, moisture absorption agglomeration and the like caused by independently using the desulfurization gypsum for improvement. The mineral source nitro humic acid contains more acidic functional groups, so cations in soil can be adsorbed and exchanged, and heavy metals in the desulfurized gypsum can be adsorbed, complexed and solidified, thereby reducing the influence of the heavy metals on plants. Compared with biomass charcoal-desulfurized gypsum soil conditioner, the invention adopts the mineral source nitro humic acid as the raw material, has high humus content in the raw material, effectively utilizes the desulfurized gypsum and simultaneously solves the problem of environmental pollution caused by the accumulation of the desulfurized gypsum.

Inventors

  • TANG MIN
  • XIE RUIYIN
  • REN YUAN
  • BAI WEILIAN
  • WANG KAI
  • XIAO JUN

Assignees

  • 重庆天融绿丽生物科技有限公司

Dates

Publication Date
20260505
Application Date
20260121

Claims (5)

  1. 1. The soil conditioner is characterized in that the mass ratio of the mineral source nitro humic acid to the desulfurized gypsum is (50-150): 100, and the particle diameter of the mineral source nitro humic acid is 60-100 meshes.
  2. 2. The mineral source nitro-humic acid-desulfurized gypsum soil conditioner of claim 1, wherein the mineral source nitro-humic acid comprises the following substances in dry basis: The humic acid content is more than or equal to 55 percent The content of fulvic acid is more than or equal to 3 percent Cation exchange capacity not less than 300 Total nitrogen not less than 2.5 Nitrate nitrogen not less than 1.5 Free acid is less than or equal to 1 PH (1:100) of 2-4 The moisture is less than or equal to 30 percent.
  3. 3. The mining source nitro-humic acid-desulfurized gypsum soil conditioner of claim 1, wherein the heavy metal index in the mining source nitro-humic acid meets the "HGT5604-2019 nitro-humic acid standard".
  4. 4. The mining nitrohumic acid-desulfurized gypsum soil conditioner according to claim 1, wherein the desulfurized gypsum is detected according to the detection method in NY/T3936-2021 soil conditioner and use procedure flue gas desulfurized gypsum raw material.
  5. 5. A method for preparing the soil conditioner according to claim 1, which is characterized by comprising the following steps: (1) Grinding lignite/weathered coal into 80-120 mesh powder; (2) Placing the powder in the step (1) in a closed reaction kettle, and adding nitric acid under the reaction conditions of 0-0.15MPa and 60-120 ℃ for activation reaction; (3) Curing and cooling the powder subjected to the activation reaction in the step (2) to room temperature, and crushing to obtain mineral source nitro humic acid powder; (4) And (3) uniformly mixing the mineral source nitro-humic acid prepared by the activation reaction in the step (3) with the desulfurization gypsum to obtain the mineral source nitro-humic acid-desulfurization gypsum soil conditioner.

Description

Mineral source nitro humic acid-desulfurized gypsum soil conditioner and preparation method thereof Technical Field The invention relates to the technical field of soil amendments, in particular to a soil amendment based on mineral source nitro humic acid-desulfurized gypsum and a preparation method thereof. Background The annual emission of desulfurization gypsum (FGD gypsum) of coal-fired power plants exceeds hundred million tons, the main component is calcium sulfate dihydrate (CaSO 4·2H2 O), the utilization rate is less than 50%, the main component of the desulfurization gypsum for accumulating and polluting the environment is calcium sulfate dihydrate (CaSO 4·2H2 O), the desulfurization gypsum also contains components such as CaSO3 and fly ash, the desulfurization gypsum contains rich S, ca, si and the like, the substances are mineral nutrition necessary or beneficial for plants, and meanwhile, the characteristics of the desulfurization gypsum can change the soil salt alkalinity, so that the desulfurization gypsum can be used as a saline-alkali soil modifier. However, due to the complexity of the components in the coal-fired flue gas, the coal-fired flue gas desulfurization gypsum also contains Pb, cd, cr, as, se, ni, cu and other heavy metals, and the heavy metals can harm plants after entering soil along with the desulfurization gypsum. The direct use of the desulfurized gypsum is easy to cause soil hardening, and the desulfurized gypsum has strong hygroscopicity, so that the desulfurized gypsum is easy to agglomerate and shed unevenly, is difficult to use and is unevenly mixed with soil. Patent CN103069944a discloses a rapid improvement method of severe soda saline-alkali soil. However, due to its relatively strong hygroscopicity, desulfurized gypsum tends to cake, spread unevenly, be difficult to apply, mix unevenly with soil, and may have serious consequences such as cation exchange limitations, alkalinity enhancement, and crop growth inhibition when used alone. Patent CN201611168726.1 discloses a biomass charcoal-desulfurized gypsum soil conditioner, a preparation method and application thereof. The organic matters contained in the biomass are changed into tar, gas and coke after high-temperature carbonization, and a large amount of organic matters cannot be added to the soil after the organic matters are applied to the soil. And biomass raw materials are wide in category, nonuniform in components, difficult to collect and store, and difficult to form large scale. Therefore, the invention provides a soil conditioner based on mineral source nitro-humic acid-desulfurized gypsum and a preparation method thereof, wherein the soil conditioner is prepared by combining the mineral source nitro-humic acid with desulfurized gypsum, so that the desulfurized gypsum is effectively utilized and the problem of environmental pollution caused by accumulation of the desulfurized gypsum is solved. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a soil conditioner based on mineral source nitro humic acid-desulfurized gypsum and a preparation method thereof. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the soil conditioner is prepared from (50-150) mineral source nitro humic acid and desulfurized gypsum (100), and has particle diameter of 60-100 meshes. Preferably, the mineral source nitro humic acid comprises the following substances in terms of dry weight: The humic acid content is more than or equal to 55 percent The content of fulvic acid is more than or equal to 3 percent Cation exchange capacity not less than 300 Total nitrogen not less than 2.5 Nitrate nitrogen not less than 1.5 Free acid is less than or equal to 1 PH (1:100) of 2-4 The moisture is less than or equal to 30 percent. Preferably, the heavy metal index in the mineral source nitro humic acid meets the HGT5604-2019 nitro humic acid standard. Preferably, the desulfurized gypsum is detected according to the detection method in NY/T3936-2021 soil conditioner and use procedure flue gas desulfurized gypsum raw material. The preparation method of the soil conditioner specifically comprises the following steps: (1) Grinding lignite/weathered coal into 80-120 mesh powder; (2) Placing the powder in the step (1) in a closed reaction kettle, and adding nitric acid under the reaction conditions of 0-0.15MPa and 60-120 ℃ for activation reaction; (3) Curing and cooling the powder subjected to the activation reaction in the step (2) to room temperature, and crushing to obtain mineral source nitro humic acid powder; (4) And (3) uniformly mixing the mineral source nitro-humic acid prepared by the activation reaction in the step (3) with the desulfurization gypsum to obtain the mineral source nitro-humic acid-desulfurization gypsum soil conditioner. Compared with the prior art, the invention has the beneficial effects that: The invention adopts the combination of the minera