阅读说明：本技术 一种利用工业烟气对固废基人造种植土壤碱度的调节方法 (Method for adjusting alkalinity of artificial planting soil of solid waste base by using industrial flue gas ) 是由 高宏宇 苏迪 周凯 令狐超 程芳琴 于 2021-08-24 设计创作，主要内容包括：一种利用工业烟气对固废基人造种植土壤碱度的调节方法,属于碳减排、固废资源化利用和生态修复领域,可解决工业烟气资源浪费和固废基人造种植土壤碱度高导致对种植植物种类的范围选择窄等问题,工业烟气中CO-(2)浓度为5%wt.～25%wt.,SO-(2)浓度≤100mg/m～(3),通过管道输送进入养护室,养护室内的固废基人造种植土以颗粒形态铺设在多层台盘上,养护湿度≥90%,养护气体压力大于1MPa,养护温度20～200℃,养护时间5～30min,养护后的固废基人造种植土颗粒的pH为7～8。本发明降低了人造土壤的pH,提高了植物生长的适应性,提高了土壤的整体强度,可矿化固定二氧化碳温室气体,对二氧化碳减排有积极贡献。(A method for adjusting alkalinity of solid waste base artificial planting soil by using industrial flue gas belongs to the fields of carbon emission reduction, solid waste resource utilization and ecological restoration, and can solve the problems of narrow selection of the variety of planted plants caused by waste of industrial flue gas resources and high alkalinity of solid waste base artificial planting soil, and the like, and CO in the industrial flue gas 2 Concentration of 5-25% wt., SO 2 The concentration is less than or equal to 100mg/m 3 Delivering the soil to a curing room through a pipeline, paving the solid waste base artificial planting soil in the curing room on a multilayer table plate in a granular form, wherein the curing humidity is more than or equal to 90 percent, and the pressure of curing gasAnd (3) curing at the curing temperature of 20-200 ℃ for 5-30min under the pressure of more than 1MPa, wherein the pH value of the cured solid waste base artificial planting soil particles is 7-8. The invention reduces the pH value of artificial soil, improves the adaptability of plant growth, improves the overall strength of the soil, can mineralize and fix carbon dioxide greenhouse gas, and makes positive contribution to carbon dioxide emission reduction.)

1. A method for adjusting the alkalinity of artificial planting soil of solid waste base by using industrial flue gas is characterized by comprising the following steps: the method comprises the following steps:

step one, material distribution: laying solid waste base artificial planting soil particles with the particle size of less than 5mm on a multilayer table disc by a material distributor, and placing the solid waste base artificial planting soil particles in a curing chamber, wherein the thickness of the solid waste base artificial planting soil particles is less than 60 mm;

step two, adjusting maintenance technological parameters: closing the curing chamber after the first step is finished, spraying water into the curing chamber by using an atomizer to adjust the humidity to be more than or equal to 90%, spraying industrial flue gas from pipelines at the bottom of the periphery of the curing chamber, controlling the curing temperature to be 20-200 ℃, controlling the air pressure in the curing chamber to be not less than 1MPa, and controlling the curing time to be 5-30 min;

step three, discharging: closing the smoke, opening the air valve, and discharging the multilayer table plate loaded with the artificial planting soil particles of the solid waste base out of the curing chamber along with the track;

fourthly, drying: pouring out the solid waste base artificial planting soil particles obtained in the third step from a multilayer table plate, and placing the solid waste base artificial planting soil particles in a drying oven at 50-120 ℃ or naturally airing the solid waste base artificial planting soil particles in a ventilated place;

step five, granulating: and (4) putting the dried and formed solid waste base artificial planting soil prepared in the fourth step into a rolling crusher for granulation to prepare the solid waste base artificial planting soil with the granularity less than 5 mm.

2. The method for adjusting the alkalinity of the artificial planting soil of the solid waste base by using the industrial flue gas as claimed in claim 1, is characterized in that: in the first step, the solid waste base artificial planting soil comprises the following components in percentage by mass: solid waste: ordinary silica cement or fly ash cement or self-gelling powder: foaming agent: the proportion of water is 90-98: 2-10: 0.01-0.09: 0.1-0.5.

3. The method for adjusting the alkalinity of the artificial planting soil of the solid waste base by using the industrial flue gas as claimed in claim 1, is characterized in that: the solid waste comprises washing tailings/tail mud or hydrometallurgy tail mud.

4. The method for adjusting the alkalinity of the artificial planting soil of the solid waste base by using the industrial flue gas as claimed in claim 1, is characterized in that: the solid waste comprises any one of fly ash, coal gangue, iron tailings, copper tailings, red mud, kaolin mud and gypsum.

5. The method for adjusting the alkalinity of the artificial planting soil of the solid waste base by using the industrial flue gas as claimed in claim 1, is characterized in that: the self-gelling powder comprises the following components in percentage by mass: fly ash: steel slag: carbide slag: the proportion of the phosphogypsum or the desulfurized gypsum is 60-70: 15-25: 5-15: 5-10.

6. The method for adjusting the alkalinity of the artificial planting soil of the solid waste base by using the industrial flue gas as claimed in claim 1, is characterized in that: the foaming agent comprises any one of aluminum powder, hydrogen peroxide and baking soda.

7. The method for adjusting the alkalinity of the artificial planting soil of the solid waste base by using the industrial flue gas as claimed in claim 1, is characterized in that: CO in the industrial flue gas₂Concentration of 5-25% wt., SO₂The concentration is less than or equal to 100mg/m³。

Technical Field

The invention belongs to the technical field of carbon emission reduction, solid waste resource utilization and ecological restoration, and particularly relates to a method for adjusting the alkalinity of solid waste base artificial planting soil by using industrial flue gas.

Background

The artificial planting soil prepared by taking the solid waste and the cement-based gelled material as main raw materials has over-high alkalinity, has adverse effect on the growth of plants, is one of the main reasons for restricting the application range and the use effect of the solid waste-based artificial planting soil, and urgently needs to solve the problem. On the other hand, the industrial flue gas subjected to desulfurization and denitrification pretreatment still contains a large amount of water vapor, carbon dioxide, a small amount of sulfur dioxide and the like, and is directly discharged outside, so that not only is the environmental pollution and the small-area greenhouse effect caused, but also the waste of resources is caused. Therefore, how to combine the further utilization of the industrial flue gas with the alkalinity problem of the artificial planting soil of the solid waste base has practical significance.

At present, related research and patent reports of using tailings to prepare artificial garden soil are few, and recycled aggregate (application number: CN 200810139085.6) prepared from domestic patent carbonized curing waste is used for treating industrial waste such as steel slag, sludge, waste concrete and the like by using an accelerated carbonization technology, and is prepared by solidifying and storing greenhouse gas carbon dioxide. The pollution problem of wastes such as steel slag, waste gas and the like is relieved, and simultaneously, the lightweight recycled aggregate with good performance is prepared, wherein CO₂The gas concentration is more than 15 wt%, the curing gas pressure is more than 1bar, and the carbonization curing temperature is 30-200 ℃; the domestic patent carbonized maintenance aerated concrete (application number: CN200710017006. X) utilizes industrial waste gas, reduces the emission of carbon dioxide greenhouse gas, prepares an aerated concrete product with good performance and shortens the production period. No patent literature report about the alkalinity regulation of the artificial solid waste planting soil by using industrial flue gas is found.

Disclosure of Invention

The invention aims to solve the problems of waste of industrial flue gas resources and narrow selection range of planted plant species caused by high alkalinity of solid waste base artificial planting soil, and provides a method for adjusting the alkalinity of the solid waste base artificial planting soil by using industrial flue gas.

The invention adopts the following technical scheme:

a method for adjusting the alkalinity of artificial planting soil of solid waste base by using industrial flue gas comprises the following steps:

step one, material distribution: laying solid waste base artificial planting soil particles with the particle size of less than 5mm on a multilayer table disc by a material distributor, and placing the solid waste base artificial planting soil particles in a curing chamber, wherein the thickness of the solid waste base artificial planting soil particles is less than 60 mm;

step two, adjusting maintenance technological parameters: closing the curing chamber after the first step is finished, spraying water into the curing chamber by using an atomizer to adjust the humidity to be more than or equal to 90%, spraying industrial flue gas from pipelines at the bottom of the periphery of the curing chamber, controlling the curing temperature to be 20-200 ℃, controlling the air pressure in the curing chamber to be not less than 1MPa, and controlling the curing time to be 5-30 min;

step three, discharging: closing the smoke, opening the air valve, and discharging the multilayer table plate loaded with the artificial planting soil particles of the solid waste base out of the curing chamber along with the track;

fourthly, drying: pouring out the solid waste base artificial planting soil particles obtained in the third step from a multilayer table plate, and placing the solid waste base artificial planting soil particles in a drying oven at 50-120 ℃ or naturally airing the solid waste base artificial planting soil particles in a ventilated place;

step five, granulating: and (4) putting the dried and formed solid waste base artificial planting soil prepared in the fourth step into a rolling crusher for granulation to prepare the solid waste base artificial planting soil with the granularity less than 5 mm.

Further, the solid waste base artificial planting soil in the first step comprises the following components in percentage by mass: solid waste: ordinary silica cement or fly ash cement or self-gelling powder: foaming agent: the proportion of water is 90-98: 2-10: 0.01-0.09: 0.1-0.5.

Further, the solid waste comprises washing tailings/tailings or hydrometallurgical tailings.

Further, the solid waste comprises any one of fly ash, coal gangue, iron tailings, copper tailings, red mud, kaolin mud and gypsum.

Further, the self-gelling powder comprises the following components in percentage by mass: fly ash: steel slag: carbide slag: the proportion of the phosphogypsum or the desulfurized gypsum is 60-70: 15-25: 5-15: 5-10.

Further, the foaming agent comprises any one of aluminum powder, hydrogen peroxide and baking soda.

Further, CO in the industrial flue gas₂Concentration of 5-25% wt., SO₂The concentration is less than or equal to 100mg/m³。

The principle of the invention is as follows:

the artificial planting soil is prepared by taking solid waste, ordinary silica cement or fly ash cement or self-gelling powder, a foaming agent and water as raw materials, and is prepared by gelling reaction under alkaline conditions, so that excessive active calcium oxide still does not react completely before entering a curing room. Therefore, the main factor causing the solid waste base artificial soil to be alkaline is excessive active calcium oxide. In the maintenance process, moisture gets into in the space of artificial soil for excessive active calcium oxide dissolves and generates calcium hydroxide, and simultaneously, carbon dioxide in the environment dissolves in moisture and produces carbonate ion, and carbonate ion and calcium ion take place acidolysis neutralization reaction and generate calcium carbonate deposit and fill the shutoff in the inside in hole, have both blocked the inside alkaline material of artificial soil granule and salt and have released, have remain the pore structure of artificial soil again. In addition, high CO in the curing chamber₂The calcium carbonate generated under the concentration has low concentration CO in the air₂Provided that the calcium bicarbonate reaction is difficult to occur and is destroyed. Therefore, the method of the invention has good adjusting and improving effects on the alkalinity and salinity of the artificial soil, and the artificial soil can not be affected by CO in the air in the using process₂Is damaged by erosion.

The invention has the following beneficial effects:

according to the invention, industrial flue gas is used as a main raw material, the alkalinity of the solid waste base artificial planting soil is adjusted through industrial flue gas curing, the pH of the solid waste base artificial planting soil particles after curing is 7-8, the adaptability of good growth of plants in the solid waste base artificial planting soil is solved, the practical problems of narrow selection of the variety of the planted plants and the like caused by waste of industrial flue gas resources and high alkalinity of the solid waste base artificial planting soil are solved, the alkalinity of the solid waste base artificial planting soil can be adjusted, and the carbon emission of the industrial flue gas can be effectively reduced.

Drawings

FIG. 1 is a flow chart of the preparation of the present invention.

FIG. 2 is a graph showing the effect of industrial fumes on the porosity of the artificial planting soil of example 1 of the present invention.

FIG. 3 is a graph showing the effect of industrial fumes on the porosity of the artificial planting soil in example 2 of the present invention.

FIG. 4 is a diagram of an artificial planting soil cultivated plant of example 3 of the present invention which is not cured by industrial fumes.

FIG. 5 is a diagram of a plant cultivated after curing of artificial planting soil by industrial flue gas in example 3 of the present invention.

Detailed Description

Example 1

Firstly, paving solid waste base artificial planting soil particles with the particle size of less than 5mm on a multilayer table plate by a material distributor, wherein the thickness of the solid waste base artificial planting soil particles is less than 60mm, and the solid waste base artificial planting soil is prepared from coal gangue and ordinary cement (the ratio of the coal gangue to the ordinary cement to a foaming agent to water is 95: 4.41: 0.09: 0.5.). Then the curing chamber is closed, and the atomizer is adopted to spray water into the curing chamber to adjust the humidity of the curing chamber, wherein the humidity is more than or equal to 90 percent; the industrial flue gas is sprayed from the bottom pipelines around the curing chamber, and CO in the flue gas₂Concentration of 20% wt., SO₂The concentration is less than or equal to 100mg/m³The curing temperature is controlled at 20 ℃, the indoor air pressure is 1MPa, and the curing time is controlled at 25 min. And closing the smoke, opening the air valve, and discharging the multilayer table plate loaded with the artificial planting soil particles of the solid waste base out of the curing room along with the track. And pouring the obtained solid waste base artificial planting soil particles out of a multi-layer tray, and drying in a 60 ℃ drying oven. And granulating the obtained dry-formed solid waste base artificial planting soil by using a rolling crusher to obtain the solid waste base artificial planting soil with the granularity of less than 5 mm.

As can be seen from FIG. 2, the cement-gangue based artificial soil prepared from ordinary cement and gangue is in CO₂The aperture and the pore volume before and after the maintenance are obviousA significant change. Compared with the artificial soil before maintenance, the pore volume of the artificial soil after maintenance in the pore diameter ranges of 800-3000nm and 10000-100000nm is increased to a certain extent, and particularly the pore volume increase in the pore diameter range of 10000-100000nm is obvious. This also indicates that CO₂The maintenance is beneficial to improving the water retention, heat preservation and nutrient element bearing capacity of the cement-coal gangue based artificial soil. This is because the gelling reaction of ordinary cement is relatively slow, and the gelling reaction and CO occur during curing₂The mineralization reaction is synchronously carried out, the volume expansion of calcium carbonate generated by the mineralization and the pore wall of calcium silicate series generated by the gelation reaction are synchronously solidified, so that the pore volume is increased.

Example 2

The solid waste base artificial planting soil particles with the particle size of less than 5mm are laid on a multilayer table plate by a material distributor, the thickness of the solid waste base artificial planting soil particles is less than 60mm, the solid waste base artificial planting soil particles are prepared from coal gangue and multi-component self-gelling powder prepared by compounding coal gangue, steel slag, carbide slag, phosphogypsum or desulfurized gypsum solid waste micro powder, wherein the mass ratio of the coal gangue to the multi-component self-gelling powder to foaming agent to water is 92: 7.43: 0.07: 0.5, and the multi-component self-gelling powder comprises the following components by mass ratio of the coal gangue to the steel slag to the carbide slag to the phosphogypsum or desulfurized gypsum is 60: 20: 10: 10). Then the curing chamber is closed, and the atomizer is adopted to spray water into the curing chamber to adjust the humidity of the curing chamber, wherein the humidity is more than or equal to 95 percent; the industrial flue gas is sprayed from the bottom pipelines around the curing chamber, and CO in the flue gas₂Concentration of 15% wt., SO₂The concentration is less than or equal to 100mg/m³The curing temperature is controlled at 50 ℃, the indoor air pressure is 1MPa, and the curing time is controlled at 20 min. And closing the smoke, opening the air valve, and discharging the multilayer table plate loaded with the artificial planting soil particles of the solid waste base out of the curing room along with the track. And pouring the obtained solid waste base artificial planting soil particles out of a multi-layer tray, and drying in a 60 ℃ drying oven. And granulating the obtained dry-formed solid waste base artificial planting soil by using a rolling crusher to obtain the solid waste base artificial planting soil with the granularity of less than 5 mm.

As can be seen from FIG. 3, the multicomponent self-gelling powder-coal gangue based artificial soil prepared from multicomponent self-gelling powder and coal gangueIn CO₂The pore diameter and pore volume change before and after curing is not obvious. Compared with the artificial soil before curing, the pore volume of the cured artificial soil is slightly increased within the pore diameter range of 10000-100000nm, which also indicates that CO is slightly increased₂The maintenance does not obviously influence the water retention property, the heat preservation property, the nutrient element bearing capacity and other properties of the multi-component self-gelling powder-coal gangue based artificial soil. This is because the gelling reaction of the multicomponent self-gelling powder is relatively fast, the gelling reaction is completed before curing, and a firm pore structure has been formed. CO in curing process₂The volume expansion of the calcium carbonate produced by mineralization has only a slight influence on the pore volume in the pore size range of 10000-.

Example 3

Firstly, paving solid waste base artificial planting soil particles with the particle size of less than 5mm on a multilayer table plate by a material distributor, wherein the thickness of the solid waste base artificial planting soil particles is less than 60mm, and the solid waste base artificial planting soil is prepared from dredging sludge and fly ash cement (the ratio of the dredging sludge to the fly ash cement to a foaming agent to water is 90: 9.61: 0.09: 0.3.). Then the curing chamber is closed, and the atomizer is adopted to spray water into the curing chamber to adjust the humidity of the curing chamber, wherein the humidity is more than or equal to 98 percent; the industrial flue gas is sprayed from the bottom pipelines around the curing chamber, and CO in the flue gas₂Concentration of 15% wt., SO₂The concentration is less than or equal to 100mg/m³The curing temperature is controlled at 60 ℃, the indoor air pressure is 1.5MPa, and the curing time is controlled at 25 min. And closing the smoke, opening the air valve, and discharging the multilayer table plate loaded with the artificial planting soil particles of the solid waste base out of the curing room along with the track. And pouring the obtained solid waste base artificial planting soil particles out of a multi-layer tray, and drying in a 60 ℃ drying oven. And granulating the obtained dry-formed solid waste base artificial planting soil by using a rolling crusher to obtain the solid waste base artificial planting soil with the granularity of less than 5 mm.

As can be seen from fig. 4 and fig. 5, under the same conditions, the artificial soil prepared by the raw material ratio in example 3 has obvious difference in the growth conditions of the planted plants before and after industrial flue gas curing, the plants in fig. 4 are relatively sparse and have disordered growth directions, the plants in fig. 5 are relatively dense, the growth directions are upward, the stems and leaves of the plants are relatively healthy, and the nutrition is relatively sufficient, which indicates that the alkalinity adjustment of the artificial soil is beneficial to the healthy growth of the plants.

The performance profiles of the above examples before and after flue gas curing are shown in table 1.