CN111303887A - A kind of soil conditioner prepared by utilizing calcium silicate board waste and preparation method thereof - Google Patents

Abstract

The invention discloses a soil conditioner prepared by using calcium silicate board waste, comprising the following components in parts by weight: 5-50 parts of calcium silicate board particles, 50-95 parts of ceramsite, and the ceramsite is composed of the following The components in parts by weight are prepared: 70-90 parts of calcium silicate board powder and 10-30 parts of binder; wherein the particle size of the calcium silicate board particles is greater than 100 meshes and less than 20 meshes, and the calcium silicate board particles are The particle size of the powder is less than 100 mesh. The soil conditioner provided in the present invention uses calcium silicate board as the main raw material, and the calcium silicate board has the characteristics of strong adsorption, low specific gravity and many pores, which can absorb the useful elements and water required by vegetation in the soil, prevent useful The loss of elements and water improves soil fertility and water holding capacity. The present invention also provides a method for preparing soil conditioner by utilizing calcium silicate board waste.

Description

A kind of soil conditioner prepared by utilizing calcium silicate board waste and preparation method thereof

technical field

The invention belongs to the technical field of waste material recycling, and in particular relates to a soil conditioner prepared by using calcium silicate board waste and a preparation method thereof.

Background technique

Calcium silicate board is made of siliceous raw materials (fly ash, diatomite, powder quartz) and calcareous raw materials (lime, calcium carbide mud, etc.), and is made by adding reinforcing fibers (such as asbestos, glass fibers, etc.). Sheets made from pulping, forming, pre-curing, autoclaving, drying, cutting, sanding and other processes. Calcium silicate board has the characteristics of high strength, heat insulation, fire prevention, moisture resistance, not easy to deform, long life, no toxic and harmful chemical components, etc. It is suitable for walls, ceilings, floors, furniture, road sound insulation, sound absorption barriers, ship insulation Industrial panels such as cabins and air ducts, as well as sound-absorbing walls, sound-absorbing ceilings, pouring walls, panels of composite wall panels, etc.

With the acceleration of construction industrialization and residential industrialization, according to the national policy requirements of energy conservation and emission reduction and green environmental protection, the large-scale application of calcium silicate board as a new wall material will become a trend. When the calcium silicate board is produced in large quantities, a large amount of waste will be generated, such as the defective products of the calcium silicate board, polishing powder and leftovers. If the calcium silicate board waste is not properly treated, it will pollute the environment, and the cost of dealing with these wastes alone is high. How to effectively deal with the calcium silicate board waste is an urgent problem to be solved at present.

As a big agricultural country, my country's land resources are not optimistic. On the one hand, the development of urbanization has occupied a large amount of good cultivated land. On the other hand, the continuous increase of soil erosion has caused land degradation and is no longer suitable for crop growth. As well as the excessive use of chemical fertilizers and pesticides, soil degradation has become increasingly serious, soil fertility has declined, and productivity has decreased. The increasingly serious soil problems have prompted the development of soil amendments. The use of soil amendments has a significant effect on soil improvement. However, due to the high cost, large dosage and single effect of most soil amendments, they cannot be widely promoted. , It is of great significance to develop low-cost, multi-function soil conditioners.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned technical deficiencies, and propose a soil conditioner prepared by utilizing calcium silicate board waste, which effectively utilizes discarded calcium silicate boards, and the prepared soil conditioner can improve soil performance. Fertilizer, water retention and enhanced soil permeability without toxic and harmful chemicals. Another object of the present invention is to propose a method for preparing a soil conditioner by using calcium silicate board waste.

In order to achieve the above technical purpose, the technical solution of the present invention provides a soil conditioner prepared by using calcium silicate board waste, including the following components by weight: 5-50 parts of calcium silicate board particles, 50-50 parts of ceramsite 95 parts, the ceramsite is prepared from the following components by weight: 70-90 parts of calcium silicate board powder and 10-30 parts of binder; wherein the particle size of the calcium silicate board particles is larger than 100 mesh and smaller than 20 mesh, and the particle size of the calcium silicate board powder is less than 100 mesh.

The technical solution of the present invention also provides a method for preparing a soil conditioner by utilizing calcium silicate board waste, comprising the following steps:

S1. Pulverize the defective calcium silicate board to below 20 mesh, pass through a 20-mesh sieve and a 100-mesh sieve in turn, and collect materials with a particle size larger than 100 mesh and less than 20 mesh to obtain calcium silicate board particles, and the collected particle size is less than 100 mesh. The powder is mixed with calcium silicate board polishing powder to obtain calcium silicate board powder, and the particle size of the calcium silicate board polishing powder is less than 100 meshes;

S2, the calcium silicate board powder and the binder are uniformly mixed according to 70-90 parts of calcium silicate board powder and 10-30 parts of binder, and the water content of the obtained mixture is adjusted to 50-250%, Subsequently, granulation is carried out, and the granules obtained after granulation are dried to a moisture content of 7-12% to obtain ceramsite;

S3, uniformly mixing the ceramsite and calcium silicate board particles according to 50-95 parts of ceramsite and 5-50 parts of calcium silicate board particles to obtain a soil conditioner.

Compared with the prior art, the beneficial effects of the present invention include:

1. The soil conditioner provided in the present invention uses waste calcium silicate board as the main raw material. The calcium silicate board has the characteristics of strong adsorption, low specific gravity and many pores, which can absorb the useful elements and moisture required by vegetation in the soil. , prevent the loss of useful elements and water, and improve soil fertility and water holding capacity;

2. The particle size of the calcium silicate board particles in the soil conditioner provided in the present invention is greater than 100 mesh and less than 20 mesh, and the particle size of the calcium silicate board powder in the ceramsite is less than 100 mesh. When used together with the plate, the soil conditioner obtained has a certain particle size distribution. The particles with larger particle size can make the soil looser, increase the permeability of the soil, and prevent soil compaction. The particles with smaller particle size have a larger specific surface area and can fully touch;

3. The preparation method for preparing soil conditioner using calcium silicate board provided by the present invention uses waste calcium silicate board as raw material, the raw material cost is low and the waste calcium silicate board is effectively used, and the preparation method is simple and suitable for industrial mass production.

Description of drawings

Fig. 1 is a process flow diagram for preparing the soil conditioner of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

An embodiment of the present invention provides a soil conditioner prepared by using calcium silicate board waste, comprising the following components by weight:

5-50 parts of calcium silicate board particles and 50-95 parts of ceramsite, the ceramsite is prepared from the following components in parts by weight: 70-90 parts of calcium silicate board powder and 10-30 parts of binder; The particle size of the calcium silicate board particles is larger than 100 mesh and smaller than 20 mesh, and the particle size of the calcium silicate board powder is less than 100 mesh.

In some preferred embodiments of the present invention, the calcium silicate board includes a calcium silicate board produced by an autoclave method using siliceous materials, calcareous materials and additives based on the reaction principle of silicon oxide and calcium oxide; wherein the silicon Calcium materials include one or more of powdered quartz, diatomite, fly ash, perlite and protein soil; calcareous materials include lime and/or calcium carbide mud; additives include plant pulp, asbestos, wollastonite, One or more of glass fiber and mineral fiber.

In some preferred embodiments of the present invention, the calcium silicate board powder includes materials smaller than 100 meshes produced after the crushing of defective calcium silicate boards and polishing powders with a particle size smaller than 100 meshes produced during the production of the calcium silicate board.

In some preferred embodiments of the present invention, the binder is sepiolite and/or attapulgite. By optimizing the types of binders and using natural minerals as binders, the calcium silicate board powders are bonded together to make ceramsite for easy transportation and spreading. Harmful to soil.

An embodiment of the present invention also provides a method for preparing a soil conditioner by utilizing calcium silicate board waste, comprising the following steps:

(1) Crush the defective calcium silicate board to less than 20 mesh, pass through a 20-mesh sieve and a 100-mesh sieve in turn, and collect the materials with a particle size larger than 100 mesh and less than 20 mesh to obtain calcium silicate board particles, and the collected particle size is less than 100 mesh Mesh powder and calcium silicate board polishing powder are mixed to obtain calcium silicate board powder, and the particle size of calcium silicate board polishing powder is less than 100 mesh;

(2) The calcium silicate board powder and the binder are uniformly mixed according to 70-90 parts of the calcium silicate board powder and 10-30 parts of the binder, and the water content of the obtained mixture is adjusted to 50-250%, and then granulating, drying the granules obtained after granulation, and drying to a moisture content of 7-12% to obtain ceramsite;

(3) The ceramsite and calcium silicate board particles are uniformly mixed according to 50-95 parts of ceramsite and 5-50 parts of calcium silicate board particles to obtain a soil conditioner.

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The experimental methods in the present invention are conventional methods unless otherwise specified. The experimental materials used in the present invention are all commercially available unless otherwise specified.

The defective calcium silicate board and the calcium silicate board polishing powder used in the present invention are all from a calcium silicate board factory in Inner Mongolia, and the main component is calcium silicate hydrate; the sepiolite used is taken from Xiangtan, Hunan, and its magnesium oxide content is 10.55 %, the silica content is 38.45%; the attapulgite used is taken from Mingguang, Anhui, with a magnesium oxide content of 8.63% and a silica content of 40.76%. The particle sizes of sepiolite and attapulgite are both below 200 mesh.

Example 1:

Embodiment 1 of the present invention provides a soil conditioner prepared by using calcium silicate board waste, including the following components by weight: 14.3 parts of calcium silicate board particles and 85.7 parts of ceramsite, and the ceramsite is composed of the following parts by weight The components are prepared: 70 parts of calcium silicate board powder and 30 parts of sepiolite; wherein the particle size of calcium silicate board particles is larger than 100 mesh and smaller than 20 mesh, and the particle size of calcium silicate board powder is smaller than 100 mesh.

The present embodiment 1 also provides a method for preparing a soil conditioner by utilizing calcium silicate board waste, comprising the following steps:

(1) Crush the broken calcium silicate board defective products to less than 20 meshes, sieve the crushed materials with 20 mesh sieves and 100 mesh sieves in turn, and collect the materials with particle sizes larger than 100 meshes and smaller than 20 meshes to obtain silicic acid Calcium board particles, collect powder with particle size less than 100 meshes, and mix it with polishing powder with particle size less than 100 meshes produced during the processing of calcium silicate board to obtain calcium silicate board powder;

(2) The calcium silicate board powder and sepiolite are mixed according to 70 parts of calcium silicate board powder and 30 parts of sepiolite, put into a vortex mixer, stirred for 30 minutes and mixed evenly, and then the mass ratio of the mixture to water is Add water to the mixture in a ratio of 2:3, adjust the water content of the mixture to 150%, and then put the water-containing mixture into an extrusion granulator with a die hole of 2.5 mm for granulation, and finally granulate the obtained granules Bake in hot air at 105°C for 10 hours, and dry the particles to a moisture content of 7% to obtain ceramsite;

(3) The ceramsite and calcium silicate board particles are uniformly mixed according to 85.7 parts of ceramsite and 14.3 parts of calcium silicate board particles to obtain a soil conditioner.

Example 2:

Embodiment 2 of the present invention provides a soil conditioner prepared by using calcium silicate board waste, including the following components by weight: 30 parts of calcium silicate board particles and 70 parts of ceramsite, and the ceramsite is composed of the following parts by weight The components are prepared: 80 parts of calcium silicate board powder and 20 parts of sepiolite; wherein the particle size of calcium silicate board particles is larger than 100 mesh and smaller than 20 mesh, and the particle size of calcium silicate board powder is smaller than 100 mesh.

The present embodiment 2 also provides a method for preparing a soil conditioner by utilizing calcium silicate board waste, comprising the following steps:

(1) Crush the broken calcium silicate board defective products to less than 20 meshes, sieve the crushed materials with 20 mesh sieves and 100 mesh sieves in turn, and collect the materials with particle sizes larger than 100 meshes and smaller than 20 meshes to obtain silicic acid Calcium board particles, collect powder with particle size less than 100 meshes, and mix it with polishing powder with particle size less than 100 meshes produced during the processing of calcium silicate board to obtain calcium silicate board powder;

(2) Mix the calcium silicate board powder and sepiolite according to 80 parts of calcium silicate board powder and 20 parts of sepiolite, put them into a vortex mixer, stir for 20 minutes and mix them evenly, and then according to the mass ratio of the mixture to water: Add water to the mixture in a ratio of 1:1, adjust the water content of the mixture to 100%, and then put the water-containing mixture into an extrusion granulator with a die hole of 2.5mm for granulation, and finally granulate the obtained granules Bake in hot air at 110°C for 8 hours, and dry the particles to a moisture content of 10% to obtain ceramsite;

(3) The ceramsite and the calcium silicate board particles are uniformly mixed according to 70 parts of ceramsite and 30 parts of calcium silicate board particles to obtain a soil conditioner.

Example 3:

Embodiment 3 of the present invention provides a soil conditioner prepared by using calcium silicate board waste, including the following components by weight: 50 parts of calcium silicate board particles and 50 parts of ceramsite, and the ceramsite is composed of the following parts by weight The components are prepared: 90 parts of calcium silicate board powder and 10 parts of sepiolite; wherein the particle size of calcium silicate board particles is larger than 100 mesh and smaller than 20 mesh, and the particle size of calcium silicate board powder is smaller than 100 mesh.

The present embodiment 3 also provides a method for preparing a soil conditioner by utilizing calcium silicate board waste, comprising the following steps:

(1) Crush the broken calcium silicate board defective products to less than 20 meshes, sieve the crushed materials with 20 mesh sieves and 100 mesh sieves in turn, and collect the materials with particle sizes larger than 100 meshes and smaller than 20 meshes to obtain silicic acid Calcium board particles, collect powder with particle size less than 100 meshes, and mix it with polishing powder with particle size less than 100 meshes produced during the processing of calcium silicate board to obtain calcium silicate board powder;

(2) The calcium silicate board powder and sepiolite are mixed according to 90 parts of calcium silicate board powder and 10 parts of sepiolite, put into a vortex mixer, stirred for 15 minutes and mixed evenly, and then the mass ratio of the mixture to water is Add water to the mixture in a ratio of 3:2, adjust the water content of the mixture to 66.7%, and then put the water-containing mixture into an extrusion granulator with a die hole of 2.5 mm for granulation, and finally granulate the obtained granules Bake in hot air at 100°C for 6 hours, and dry the particles to a moisture content of 12% to obtain ceramsite;

(3) Mixing ceramsite and calcium silicate board particles uniformly according to 50 parts of ceramsite and 50 parts of calcium silicate board particles to obtain a soil conditioner.

Example 4:

Embodiment 4 of the present invention provides a soil conditioner prepared by using calcium silicate board waste. The difference between the soil conditioner and Example 1 is that the binder is attapulgite, and the rest of the preparation methods are the same as Example 1 is the same.

Example 5:

Embodiment 5 of the present invention provides a soil conditioner prepared by using calcium silicate board waste. The difference between the soil conditioner and Example 2 is that the binder is attapulgite, and the rest of the preparation methods are the same as Example 2 is the same.

Example 6:

Embodiment 6 of the present invention provides a soil conditioner prepared by using calcium silicate board waste. The difference between the soil conditioner and Example 3 is that the binder is attapulgite, and the rest of the preparation methods are the same as Example 3 is the same.

The following methods were used to test the effects of the soil conditioners provided in Examples 1 to 6 of the present invention:

Divide the experimental culture soil into 7 parts, and each part weighs 5kg, and equal amounts of urea and calcium dihydrogen phosphate are added to each part, the consumption of urea is 1.5g/kg, and the consumption of calcium dihydrogen phosphate is 1g/kg. Among the 7 groups of culture soils after adding chemical fertilizers, one group without soil conditioner was randomly selected as a comparative example, and the other six groups were respectively added with the soil conditioner obtained in Examples 1-6, and the dosage of soil conditioner was 100g/kg. Stir each group of culture soils evenly, add 1000ml of deionized water to each, and culture them outdoors for 7 days statically to obtain the results shown in Table 1. The method for determining the leaching rate in Table 1 is: take 50g samples from each group of culture soils. , each sample was rinsed with 800ml of deionized water, the eluate was collected, and the content of available nitrogen and available phosphorus in the solution was determined.

The index values of soil in Table 1 Examples 1-6 and Comparative Example

It can be seen from Table 1 that, compared with the comparative example, the capacity of the soil improved with the soil amendments prepared in Examples 1 to 6 decreased, the porosity increased, the water content also increased, and the leaching rate decreased. It is indicated that the soil conditioner in the present invention can greatly increase the water holding capacity and the fertilizer retention capacity of the soil. The main raw materials of the soil conditioner provided in the present invention are discarded calcium silicate board and polishing powder, the calcium silicate board waste is effectively utilized, and the cost of preparing the soil conditioner is also lower.

The specific embodiments of the present invention described above do not limit the protection scope of the present invention. Any other corresponding changes and modifications made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (5)

1. a soil conditioner prepared by utilizing calcium silicate board waste is characterized in that, comprising the following components by weight: 5-50 parts of calcium silicate board particles, 50-95 parts of ceramsite, and said ceramsite It is prepared from the following components in parts by weight: 70-90 parts of calcium silicate board powder and 10-30 parts of binder; wherein the particle size of the calcium silicate board particles is greater than 100 meshes and less than 20 meshes, and the silicic acid The particle size of the calcium board powder is less than 100 meshes. 2 . The soil conditioner according to claim 1 , wherein the calcium silicate board comprises the use of siliceous materials, calcareous materials and additives based on the reaction principle of silicon oxide and calcium oxide, and is produced by autoclaving. 3 . The calcium silicate board; the siliceous material includes one or more of powder quartz, diatomite, fly ash, perlite and protein soil; the calcareous material includes lime and/or calcium carbide mud; The auxiliary agent includes one or more of plant pulp, asbestos, wollastonite, glass fiber and mineral fiber. 3 . The soil conditioner according to claim 1 , wherein the calcium silicate board powder includes materials less than 100 meshes produced after the crushing of defective calcium silicate boards and materials produced during the production of calcium silicate boards. 4 . The particle size is less than 100 mesh polishing powder. 4. The soil conditioner according to claim 1, wherein the binder is sepiolite and/or attapulgite. 5. a method for utilizing calcium silicate board waste to prepare soil conditioner, is characterized in that, comprises the steps: S1. Pulverize the defective calcium silicate board to below 20 mesh, pass through a 20-mesh sieve and a 100-mesh sieve in turn, and collect materials with a particle size larger than 100 mesh and less than 20 mesh to obtain calcium silicate board particles, and the collected particle size is less than 100 mesh. The powder is mixed with calcium silicate board polishing powder to obtain calcium silicate board powder, and the particle size of the calcium silicate board polishing powder is less than 100 meshes; S2, the calcium silicate board powder and the binder are uniformly mixed according to 70-90 parts of calcium silicate board powder and 10-30 parts of binder, and the water content of the obtained mixture is adjusted to 50-250%, Subsequently, granulation is carried out, and the granules obtained after granulation are dried to a moisture content of 7-12% to obtain ceramsite; S3, uniformly mixing the ceramsite and calcium silicate board particles according to 50-95 parts of ceramsite and 5-50 parts of calcium silicate board particles to obtain a soil conditioner.

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