Preparation process of soil modifier for saline-alkali soil

Abstract

The application relates to the technical field of saline-alkali soil improvement, and particularly discloses a preparation process of a saline-alkali soil improver capable of preventing salt and alkali from returning, which comprises the following steps: (1) uniformly mixing vinegar residue powder, zeolite powder and molasses water solution, granulating, coating wood powder on the obtained granules, separating the granules, drying, obtaining an inner core and reserving; (2) uniformly mixing silicon calcium stone or pseudo-wollastonite powder, zeolite powder and desulfurization gypsum powder, adding water, uniformly stirring to form a slurry, coating the slurry on the surface of the inner core, and drying to obtain the improver. The improver prepared by the process can not only reduce the alkali content in saline-alkali soil and improve the microbial environment of the soil, but also prevent the absorbed salt from returning to the soil to cause salt and alkali to return, so that the improvement effect is more durable.

Description

Technical Field

[0001] This invention relates to the field of saline-alkali land improvement technology, and in particular to a process for preparing a soil conditioner for saline-alkali land that prevents salinization and alkali return. Background Technology

[0002] Saline-alkali land is generally characterized by high salt content or alkalinity, poor soil structure, easy compaction, low organic matter content, and nutrient deficiency. It is a degraded soil with poor properties and low fertility, seriously affecting crop growth. Saline-alkali land is mostly formed in arid climates, high groundwater levels, low-lying areas, and coastal regions. Saline-alkali land is widespread in Northwest, Northeast, and North my country, regions that are chronically arid or semi-arid with low rainfall and high evaporation, leading to the accumulation of large amounts of salt in the soil and causing salinization. Comprehensive transformation and utilization of saline-alkali land is an important aspect of natural resource protection and improvement. It is an important strategic reserve resource for improving the quality and expanding the capacity of arable land in my country and a "potential granary" for increasing grain production.

[0003] Chemical remediation technology is currently one of the important methods for improving saline-alkali land. It typically involves adding chemicals such as desulfurized gypsum and phosphogypsum to the soil to neutralize soil alkalinity and reduce salinity. However, the effects of this method are not lasting and are prone to reversion to salinity and alkalinity, requiring regular replenishment of these chemicals to maintain the improvement effect. Furthermore, with the continuous accumulation of these chemicals, excessive amounts can easily disrupt the soil's ecological balance, affecting the survival environment of soil microorganisms and producing adverse effects. Summary of the Invention

[0004] This invention provides a process for preparing a soil conditioner to prevent salinization and alkali return in saline-alkali land. This process not only reduces the alkali content in saline-alkali soil and improves the soil's microbial environment, but also prevents absorbed salts from returning to the soil, thus preventing salinization and alkali return, resulting in a more lasting improvement effect. The specific technical solution of this invention is as follows.

[0005] A process for preparing a soil conditioner to prevent salinization and alkali reversion in saline-alkali land includes the following steps:

[0006] (1) Mix vinegar residue powder, zeolite powder and molasses aqueous solution evenly and then granulate. Then add wood flour to the obtained particles for coating. After completion, separate the particles and dry them to obtain the core for later use.

[0007] (2) Mix the calcium silicate or pseudo-wollastonite powder, zeolite powder, and desulfurized gypsum powder evenly, then add water and stir to form a slurry. Then coat the core surface with the slurry and dry it to obtain the modifier.

[0008] Further, in step (1), the ratio of vinegar residue powder, zeolite powder, and molasses aqueous solution is 60~80 parts by weight: 30~45 parts by weight: 15~22 parts by weight.

[0009] Further, in step (1), the volume ratio of molasses to water in the molasses aqueous solution is 1:1.3~1.7.

[0010] Furthermore, in step (1), the fineness of the zeolite powder is 10~30 mesh.

[0011] Further, in step (1), the mass ratio of the particulate matter to the wood flour is 1:0.15~0.25. Optionally, the fineness of the wood flour is 30~50 mesh.

[0012] Furthermore, in step (1), the drying temperature is 60~80℃ and the time is 1~1.5 hours.

[0013] Furthermore, in step (1), the particle size of the kernel is 0.5~2cm, and other particles of any suitable size can also be selected as needed.

[0014] Further, in step (2), the ratio of the calcium silicate or pseudowollastonite powder, zeolite powder, and desulfurized gypsum powder is 100-130 parts by weight: 40-58 parts by weight: 30-41 parts by weight. Optionally, the fineness of the powders is 80-120 mesh.

[0015] Furthermore, in step (2), the solid content of the slurry is 50~60 wt.%.

[0016] Further, in step (2), the slurry is applied to the core and rolled evenly according to the mass ratio of 0.35 to 0.5:1 between the slurry and the core. Then, the particles are separated and dried to obtain the modifier.

[0017] Furthermore, in step (2), the drying temperature is 50~60℃ and the time is 1~1.5 hours.

[0018] Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects: The saline-alkali soil conditioner of the present invention uses a mixture of vinegar residue, zeolite powder, and molasses as its core, and is coated with a shell of calcium silicate or pseudo-wollastonite, zeolite powder, and desulfurized gypsum powder. When this conditioner with its structural and component characteristics is added to saline-alkali soil, on the one hand, the vinegar residue and molasses in the core release acidic substances to neutralize the alkalinity of the soil, thus rapidly reducing soil alkalinity. Simultaneously, the molasses provides the soil with a large amount of organic matter lacking in saline-alkali soils, allowing for the reproduction of soil microorganisms, increasing soil fertility, reducing compaction, and improving soil structure. On the other hand, the core absorbs and concentrates salt in the soil through its adsorption properties, thereby achieving the goal of rapidly reducing the salt content in the soil. On the other hand, the silicate or pseudo-wollastonite in the outer shell undergoes a carbonation reaction with carbonate ions in the soil in the presence of moisture, forming calcium carbonate and nano-silica. This solidifies the carbonate ions in the form of insoluble calcium carbonate using the silicate or pseudo-wollastonite, reducing the carbonate ions, the main source of alkalinity in the soil. This is because the hydrolysis of carbonate ions produces hydroxide ions, leading to soil alkalinity. Furthermore, after the silicate or pseudo-wollastonite is consumed, the calcium ions released from the nano-silica and calcium sulfate react with the hydroxide ions in the soil to form calcium hydroxide, creating a hydrated calcium silicate cementitious component. This component seals the outer shell, effectively preventing the salts adsorbed in the core from re-entering the soil and causing salinization and alkali degradation. Additionally, the amendment can be separated from the soil by sieving, thus completely preventing the salts in the core from re-entering the soil and causing salinization and alkali degradation. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation thereof. Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings, wherein:

[0020] Figure 1 The image shows a sample of the saline-alkali soil conditioner prepared in Example 1 below.

[0021] Figure 2 The image shows a sample of the saline-alkali soil conditioner prepared in Example 2 below. Detailed Implementation

[0022] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of skill in the art. All reagents and materials used in this invention are readily available through conventional means, and unless otherwise specified, they shall be used in accordance with conventional methods in the art or as per the product instructions.

[0024] Furthermore, any methods and materials similar to or equivalent to those described herein can be applied to the methods of this invention. The invention will now be further described in conjunction with the accompanying drawings and specific embodiments. The preferred embodiments and materials described herein are for illustrative purposes only.

[0025] Example 1:

[0026] A process for preparing a soil conditioner to prevent salinization and alkali reversion in saline-alkali land includes the following steps:

[0027] (1) Molasses and water are mixed at a volume ratio of 1:1.3 and stirred evenly to obtain a molasses aqueous solution. 20-mesh vinegar residue powder, 20-mesh zeolite powder, and the molasses aqueous solution are mixed at a ratio of 70 parts by weight: 40 parts by weight: 16 parts by weight and stirred evenly, then granulated. Then, 50-mesh wood flour is added to the obtained granules at a mass ratio of 1:0.18. The granules are rolled to uniformly coat the surface with wood flour, and then the granules are separated and dried at 60°C for 1.5 hours to obtain a core with a particle size distribution between 1 and 1.5 cm, for later use.

[0028] (2) Mix 100-mesh silica-calcium stone powder, zeolite powder, and desulfurized gypsum powder in a ratio of 110 parts by weight: 48 parts by weight: 36 parts by weight, stir evenly, then add water and stir evenly to obtain a slurry with a solid content of 55 wt.%. Then, according to the mass ratio of the slurry to the core, apply the slurry to the tumbling core and continue tumbling to form a uniform coating layer on the surface of the core. Then, dry the obtained particles at 60°C for 1.5 hours to obtain a saline-alkali soil conditioner (such as...). Figure 1 (As shown).

[0029] Performance test: (1) The amendment prepared in this embodiment was added to saline-alkali soil with a total salt content (including sodium chloride, potassium chloride, sodium sulfate, and sodium carbonate) of 10.27g per kilogram of soil and a pH of 8.59. The amount added was 25% of the soil mass. After stirring evenly, water was sprinkled into the soil at a moisture content of 20%. The total salt content and pH value in the soil were tested after 15 days and 45 days (the moisture content was maintained during the process), and the salt removal rate was calculated. The results are shown in the table below. It can be seen that the salt content and alkalinity of the soil decreased significantly after the amendment, and the phenomenon of salt re-entering the soil and causing salt and alkali re-entry was effectively overcome.

[0030]

[0031] Example 2:

[0032] A process for preparing a soil conditioner to prevent salinization and alkali reversion in saline-alkali land includes the following steps:

[0033] (1) Molasses and water are mixed at a volume ratio of 1:1.5 and stirred evenly to obtain a molasses aqueous solution. 30-mesh vinegar residue powder, 20-mesh zeolite powder, and the molasses aqueous solution are mixed at a ratio of 80 parts by weight: 45 parts by weight: 22 parts by weight and stirred evenly, then granulated. Then, 30-mesh wood flour is added to the obtained granules at a mass ratio of 1:0.25. The granules are rolled to uniformly coat the surface with wood flour, and then the granules are separated and dried at 70°C for 1.0 hour to obtain a core with a particle size distribution between 1.5 and 2 cm, for later use.

[0034] (2) Mix 120-mesh silica-calcium stone powder, zeolite powder, and desulfurized gypsum powder in a ratio of 100 parts by weight: 40 parts by weight: 30 parts by weight, stir evenly, then add water and stir evenly to obtain a slurry with a solid content of 60 wt.%. Then, according to the mass ratio of the slurry to the core, apply the slurry to the tumbling core and continue tumbling to form a uniform coating layer on the surface of the core. Then, dry the obtained particles at 60°C for 1.0 hour to obtain a saline-alkali soil conditioner (such as...). Figure 2 (As shown).

[0035] Performance test: (1) The amendment prepared in this embodiment was added to saline-alkali soil with a total salt content (including sodium chloride, potassium chloride, sodium sulfate, and sodium carbonate) of 10.27g per kilogram of soil and a pH of 8.59. The amount added was 25% of the soil mass. After stirring evenly, water was sprinkled into the soil at a moisture content of 20%. The total salt content and pH value in the soil were tested after 15 days and 45 days (the moisture content was maintained during the process), and the salt removal rate was calculated. The results are shown in the table below. It can be seen that the salt content and alkalinity of the soil decreased significantly after the amendment, and the phenomenon of salt re-entering the soil and causing salt and alkali return was effectively overcome.

[0036]

[0037] Example 3:

[0038] A process for preparing a soil conditioner to prevent salinization and alkali reversion in saline-alkali land includes the following steps:

[0039] (1) Molasses and water are mixed at a volume ratio of 1:1.7 and stirred evenly to obtain a molasses aqueous solution. Vinegar residue powder (10 mesh), zeolite powder (10 mesh), and the molasses aqueous solution are mixed at a ratio of 60 parts by weight: 30 parts by weight: 15 parts by weight and stirred evenly, then granulated. Then, 40 mesh wood flour is added to the obtained granules at a mass ratio of 1:0.15. The granules are rolled to uniformly coat the surface with wood flour, and then the granules are separated and dried at 80°C for 1.0 hour to obtain a core with a particle size distribution between 0.5 and 1.0 cm, for later use.

[0040] (2) Mix calcium silicate powder, zeolite powder, and desulfurized gypsum powder, all with a fineness of 80 mesh, in a ratio of 130 parts by weight: 58 parts by weight: 41 parts by weight, and stir until homogeneous. Then add water and stir until homogeneous to obtain a slurry with a solid content of 50 wt.%. Then, according to the mass ratio of the slurry to the core, apply the slurry to the tumbling core and continue tumbling to form a uniform coating layer on the surface of the core. Then dry the obtained particles at 50°C for 1.5 hours to obtain a saline-alkali soil conditioner.

[0041] Performance test: (1) The amendment prepared in this embodiment was added to saline-alkali soil with a total salt content (including sodium chloride, potassium chloride, sodium sulfate, and sodium carbonate) of 10.27g per kilogram of soil and a pH of 8.59. The amount added was 25% of the soil mass. After stirring evenly, water was sprinkled into the soil at a moisture content of 20%. The total salt content and pH value in the soil were tested after 15 days and 45 days (the moisture content was maintained during the process), and the salt removal rate was calculated. The results are shown in the table below. It can be seen that the salt content and alkalinity of the soil decreased significantly after the amendment, and the phenomenon of salt re-entering the soil and causing salt and alkali return was effectively overcome.

[0042]

[0043] Example 4:

[0044] A process for preparing a soil conditioner to prevent salinization and alkali reversion in saline-alkali land includes the following steps:

[0045] (1) Molasses and water are mixed at a volume ratio of 1:1.3 and stirred evenly to obtain a molasses aqueous solution. Zeolite powder with a fineness of 20 mesh is mixed with the molasses aqueous solution at a ratio of 110 parts by weight: 16 parts by weight and stirred evenly, and then granulated. Then, 50 mesh wood flour is added to the obtained granules at a mass ratio of 1:0.18, and the granules are rolled to uniformly coat the surface of the granules with wood flour. The granules are then separated and dried at 60°C for 1.5 hours to obtain a core with a particle size distribution between 1 and 1.5 cm, which is then set aside for later use.

[0046] (2) Mix calcium silicate powder, zeolite powder, and desulfurized gypsum powder, all with a fineness of 100 mesh, in a ratio of 110 parts by weight: 48 parts by weight: 36 parts by weight, and stir evenly. Then add water and stir evenly to obtain a slurry with a solid content of 55 wt.%. Then, according to the mass ratio of the slurry to the core, apply the slurry to the tumbling core and continue to tumble to form a uniform coating layer on the surface of the core. Then dry the obtained particles at 60°C for 1.5 hours to obtain a saline-alkali soil conditioner.

[0047] Performance test: (1) The amendment prepared in this embodiment was added to saline-alkali soil with a total salt content (including sodium chloride, potassium chloride, sodium sulfate, and sodium carbonate) of 10.27g per kilogram of soil and a pH of 8.59. The amount added was 25% of the soil mass. After stirring evenly, water was sprinkled into the soil at a moisture content of 20%. The total salt content and pH value in the soil were tested after 15 days and 45 days (the moisture content was maintained as described above), and the salt removal rate was calculated. The results are shown in the table below. It can be seen that although the effect of the amendment prepared in this embodiment on the removal of salt and reduction of alkalinity in the soil decreased, it showed good prevention of the salt in the amendment from re-entering the soil and causing the problem of salt and alkali return.

[0048]

[0049] Example 5:

[0050] A process for preparing a soil conditioner to prevent salinization and alkali reversion in saline-alkali land includes the following steps:

[0051] (1) Molasses and water are mixed at a volume ratio of 1:1.5 and stirred evenly to obtain a molasses aqueous solution. 30-mesh vinegar residue powder, 20-mesh zeolite powder, and the molasses aqueous solution are mixed at a ratio of 80 parts by weight: 45 parts by weight: 22 parts by weight and stirred evenly, then granulated. Then, 30-mesh wood flour is added to the obtained granules at a mass ratio of 1:0.25. The granules are rolled to uniformly coat the surface with wood flour, and then the granules are separated and dried at 70°C for 1.0 hour to obtain a core with a particle size distribution between 1.5 and 2 cm, for later use.

[0052] (2) Zeolite powder with a fineness of 120 mesh and desulfurized gypsum powder are mixed at a ratio of 140 parts by weight to 30 parts by weight and stirred evenly. Then water is added and stirred evenly to obtain a slurry with a solid content of 60 wt.%. Then, according to the mass ratio of the slurry to the core, the slurry is applied to the tumbling core and tumbling is continued to form a uniform coating layer on the surface of the core. Then the obtained particles are dried at 60°C for 1.0 hour to obtain the saline-alkali soil conditioner.

[0053] Performance test: (1) The amendment prepared in this embodiment was added to saline-alkali soil with a total salt content (including sodium chloride, potassium chloride, sodium sulfate, and sodium carbonate) of 10.27g per kilogram of soil and a pH of 8.59. The amount added was 25% of the soil mass. After stirring evenly, water was sprinkled into the soil at a moisture content of 20%. The total salt content and pH value in the soil were tested after 15 days and 45 days (the moisture content was maintained as described above), and the salt removal rate was calculated. The results are shown in the table below. It can be seen that the amendment prepared in this embodiment has a significantly reduced effect on the removal of salt and the reduction of alkalinity in the soil. Moreover, it failed to effectively prevent the salt absorbed in the amendment from re-entering the soil, resulting in salt and alkali return.

[0054]

[0055] Example 6:

[0056] A process for preparing a soil conditioner for saline-alkali land to prevent salinization and alkali return includes the following steps: Molasses and water are mixed at a volume ratio of 1:1.7 and stirred evenly to obtain a molasses aqueous solution. Vinegar residue powder (10 mesh), zeolite powder (10 mesh), and the molasses aqueous solution are mixed at a ratio of 60 parts by weight: 30 parts by weight: 15 parts by weight and stirred evenly, then granulated. Then, 40 mesh wood flour is added to the obtained granules at a mass ratio of 1:0.15, and the granules are rolled to uniformly coat the surface with wood flour. The granules are then separated and dried at 80℃ for 1.0 hour to obtain a soil conditioner for saline-alkali land with a particle size distribution between 0.5 and 1.0 cm.

[0057] Performance test: (1) The amendment prepared in this embodiment was added to saline-alkali soil with a total salt content (including sodium chloride, potassium chloride, sodium sulfate, and sodium carbonate) of 10.27g per kilogram of soil and a pH of 8.59. The amount added was 25% of the soil mass. After stirring evenly, water was sprinkled into the soil at a moisture content of 20%. The total salt content and pH value in the soil were tested after 15 days and 45 days (the moisture content was maintained as described above), and the salt removal rate was calculated. The results are shown in the table below. It can be seen that the amendment prepared in this embodiment has a significantly reduced effect on salt removal and alkalinity reduction in the soil, and obvious salt and alkali return phenomena have appeared.

[0058]

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A process for preparing a soil conditioner to prevent salinization and alkali return in saline-alkali land, characterized in that, Includes the following steps: (1) Mix vinegar residue powder, zeolite powder, and molasses aqueous solution in a ratio of 60-80 parts by weight: 30-45 parts by weight: 15-22 parts by weight, then granulate the mixture. Add wood flour to the resulting granules for coating. After completion, separate the granules and dry them to obtain the core for later use. (2) Mix calcium silicate or pseudo wollastonite powder, zeolite powder and desulfurized gypsum powder in a ratio of 100~130 parts by weight: 40~58 parts by weight: 30~41 parts by weight, add water and mix well to form a slurry; then coat the slurry onto the surface of the core and dry it to obtain the modifier.

2. The preparation process of the anti-saltification and anti-alkali soil conditioner for saline-alkali land according to claim 1, characterized in that, In step (1), the fineness of the zeolite powder is 10~30 mesh.

3. The preparation process of the anti-saltification and anti-alkali soil conditioner according to claim 1, characterized in that, In step (1), the volume ratio of molasses to water in the molasses aqueous solution is 1:1.3~1.

7.

4. The preparation process of the anti-saltification and anti-alkali soil conditioner according to claim 1, characterized in that, In step (1), the mass ratio of the particulate matter to the wood flour is 1:0.15~0.

25.

5. The preparation process of the anti-saltification and anti-alkali soil conditioner for saline-alkali land according to claim 1, characterized in that, In step (1), the fineness of the wood powder is 30~50 mesh.

6. The preparation process of the anti-saltification and anti-alkali soil conditioner according to claim 1, characterized in that, In step (1), the drying temperature is 60~80℃ and the time is 1~1.5 hours.

7. The preparation process of the anti-saltification and anti-alkali soil conditioner for saline-alkali land according to claim 1, characterized in that, In step (1), the particle size of the kernel is 0.5~2cm.

8. The preparation process of the anti-saltification and anti-alkali soil conditioner according to claim 1, characterized in that, In step (2), the fineness of the calcium silicate or pseudo-wollastonite powder, zeolite powder, and desulfurized gypsum powder is 80~120 mesh.

9. The preparation process of the anti-saltification and anti-alkali soil conditioner according to claim 1, characterized in that, In step (2), the solid content of the slurry is 50~60 wt.%.

10. The preparation process of the anti-saltification and anti-alkali soil conditioner for saline-alkali land according to claim 1, characterized in that, In step (2), the slurry is applied to the core and rolled evenly according to the mass ratio of 0.35 to 0.5:1 between the slurry and the core. Then, the particles are separated and dried to obtain the modifier.

11. The preparation process of the anti-saltification and anti-alkali soil conditioner according to any one of claims 1-10, characterized in that, In step (2), the drying temperature is 50~60℃ and the time is 1~1.5 hours.

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