CN105057338A - Method for improving saline alkali soil with steel works sintering flue gas wet desulphurization gypsum - Google Patents
Method for improving saline alkali soil with steel works sintering flue gas wet desulphurization gypsum Download PDFInfo
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- CN105057338A CN105057338A CN201510441076.2A CN201510441076A CN105057338A CN 105057338 A CN105057338 A CN 105057338A CN 201510441076 A CN201510441076 A CN 201510441076A CN 105057338 A CN105057338 A CN 105057338A
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Abstract
The invention relates to a method for improving saline alkali soil with steel works sintering flue gas wet desulphurization gypsum. Gypsum slurry generated in wet desulphurization equipment is subjected to precipitation and briquetting and dehydration through a filter press; the chemical components of the desulphurization gypsum are analyzed, the contents of harmful substances such as heavy metal and dioxin are analyzed, and the desulphurization gypsum can be directly applied under the condition that the heavy metal meets the national standards related to agriculture and soil; the application amount is calculated according to the content of CaSO4 in the sintering flue gas wet desulphurization gypsum; the desulphurization gypsum is applied in a ground surface throwing mode, and the desulphurization gypsum is mixed well with surface soil in a plowing mode; after irrigation or rainwater leaching, improvement on moderate and serious saline alkali soil is realized. The method for improving the saline alkali soil with the steel works sintering flue gas wet desulphurization gypsum realizes resource utilization of the steel works sintering flue gas wet desulphurization gypsum, reduces resource waste and secondary pollution caused by stacking, throwing and other simple treatment methods, improves the physical properties and granular structure of the saline alkali soil, lowers the alkalinity of the saline alkali soil, improves the ecological environment of the land, and changes salty land into oases.
Description
Technical field
The present invention relates to a kind of processing method of steel works sintering flue gas wet flue gas desulfurization gypsum, particularly relate to a kind of method steel works sintering flue gas wet flue gas desulfurization gypsum being applied to improvement salt affected soil.
Background technology
Ferrous metal smelting and rolling processing industry is the second largest industry of sulfur dioxide (SO2) emissions after power industry, and wherein in smelting iron and steel, sintering circuit is major polluting sources.2013, smelting iron and steel enterprise 740 that include Chinese Ministry of Environmental Protection's focal investigation scope of statistics in, that have sintering machine or pelletizing equipment, accounted for 0.5% of focal investigation industrial enterprise sum.Have sintering machine number 1258 altogether, wherein 447 have desulfurization equipment; Have pelletizing equipment number 598 to overlap, wherein 52 covers have desulfurization equipment.Smelting iron and steel enterprise SO2 emissions are 199.3 ten thousand tons, reduce by 0.4% than last year, account for 11.8% of focal investigation industrial enterprise discharge capacity, account for 84.8% of ferrous metal smelting and rolling processing industry discharge capacity.Sulfur dioxide removal amount is 75.8 ten thousand tons, and removal rate of sulfur dioxide is 27.6%, lower than focal investigation industrial enterprise average level 44.6 percentage points.
Sintering flue gas desulfurization can be divided into three classes substantially: wet method, semidry method and dry method.Wherein wet method and limestone/lime-gypsum method are current most widely used a kind of flue gas desulfurization techniques, iron and steel enterprise at present more adopts this method, its principle adopts agstone/lime to make slurries as desulfurization absorbent, enter absorption tower to mix with smoke contacts, calcium carbonate/calcium hydroxide in slurries and the SO2 in flue gas and the oxidation air blasted carry out chemical reaction, finally generate gypsum.Limestone/lime-gypsum law technology is ripe, and desulfuration efficiency is high, and desulfurizing agent price is lower, but produces a large amount of desulfurizing byproduct---and desulfurated plaster, and progressively popularizing along with domestic sintering desulfuration equipment, the desulfurated plaster output of corresponding generation will grow with each passing day.Because China exists a large amount of cheap plaster of paris, therefore the sintered flue gas desulfurization gypsum of inferior quality is not effectively recycled in China, although to have certain applications in cement additire, roadbed material, construction material etc., but disposal cost is higher and apply not general at home, comparatively simple disposal options such as stacking and abandon is got by part iron enterprise still Bian, land occupation, waste resource, and secondary pollution is caused to environment.
The measure in current improvement salt-soda soil mainly contains physically improved, water conservancy improvement, chemical modifying, biological modification etc.Apply gypsum improvement soil in the world and originate from 19th-century later stage Soil Loss scholar Hilgad, and means of flue gas desulfurization of power plant gypsum improvement salt affected soil is proposed by Tokyo Univ Japan professor Song Bencong and ding fang zhengyi early 1990s.Tsing-Hua University patent CN200610011116.0 discloses a kind of purposes of flue gas desulfurization waste of fire coal and the method for improvement basic soil thereof, the application that CN200810119806.7 describes flue gas desulfurization waste of fire coal and the method for planting trees for salt-soda soil thereof, patent CN200510063399.9, CN200910091734.4, CN201110190313.4, CN201210589939.7 all relate to the method that coal-fired power plant flue gas desulfurization waste is applied to improvement saline-alkali soil.And for steel enterprise sintering flue gas wet flue gas desulfurization gypsum be applied to salt affected soil transformation scheme there is no report.
If iron and steel enterprise can apply sintering smoke wet method sulphur gypsum transforming salinization soil, can operating Mode of Circular Economy be realized, make enterprise while Environment control, can turn waste into wealth, improve eco-land planning, ensure China's grain security and promote national economy sustainable development.
Summary of the invention
The object of the invention is to solve steel enterprise sintering flue gas wet flue gas desulfurization gypsum recycling problem, reduce the saline alkali of salinized soil simultaneously, improve saline and alkaline eco-land planning.
The present invention utilizes the calcium ion (Ca in steel works sintering flue gas wet flue gas desulfurization gypsum
2+) exchange the sodium ion (Na adhered in soil colloid
+) displacement, generate Na
2sO
4, enter the soil liquid from soil colloid, with oozing under irrigation water or draining via drainage ditch.Thus reduce the basicity of soil, improve the physical behavior of soil and the crumb structure of soil, increase loosing soil degree and water penetration, be conducive to plant growth and absorb water and nutrient.
The present invention's gypsum used is steel works sintering flue gas wet flue gas desulfurization gypsum, the gypsum slurries produced in wet desulphurization equipment is through precipitation, after venting part clear liquid, adopt filter press briquetting, adsorbed water 10 ~ 30%, does not need to adopt vacuum or drying mode to dewater, has both reduced the energy consumption of processing procedure, improve treatment effeciency, also prevent in storage, transportation the secondary pollution producing dust and cause.
Gypsum component is analyzed: with reference to " GB/T5484 chemical analysis of gypsum method " to the attached water of steel works sintering flue gas wet flue gas desulfurization gypsum, the crystallization water, CaO, SO
3, SO
2etc. analyzing, and draw CaSO in gypsum by conversion
4, CaSO
3content, in dry base, CaSO4 content is 60 ~ 70%, and containing other be hydrolyzed to alkalescence salt constituents; Analyze the content of the harmful substances such as its heavy metal, bioxin simultaneously, can directly use when heavy metal meets the concerned countries standard of agricultural and soil.Generally, in sintering smoke wet method sulphur gypsum, content of beary metal meets relevant criterion, even if Partial Elements is a little more than standard value, but because amount of application is less, and only use once, mix with soil after using and be equivalent to dilute, final heavy metal in soil content still meets standard of soil environment quality.
Soil of the present invention is moderate and alkaline-saline soil, and pH is 8 ~ 10, basicity >20%.
Amount of application: ensure CaSO in the steel works sintering flue gas wet flue gas desulfurization gypsum used
4content is 1000kg ~ 3000kg/ mu, and earth's surface is shed and used, and by plowing, desulfurated plaster is mixed with topsoil, through irrigation or the rain of >3 time, and each 80 ~ 100 cubic metres/mu of water yield or more.
The invention provides a kind of novelty teabag of steel works sintering flue gas wet flue gas desulfurization gypsum, steel works sintering flue gas wet flue gas desulfurization gypsum is introduced in the improvement of salt affected soil, not only solve the recycling of steel works sintering flue gas wet flue gas desulfurization gypsum, the wasting of resources that the simple process modes such as reduction is stacked, abandon are brought and secondary pollution, also can improve physical behavior and the crumb structure of salt affected soil simultaneously, reduce the basicity of salt affected soil, large area saline-alkali wasteland is made to become oasis, improve the ecological environment in soil, there is good Social benefit and economic benefit.
Detailed description of the invention
Make the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with embodiment.
The embodiment of the present invention 1 and embodiment 2 are applied to the test situation of improvement salt affected soil for steel works sintering flue gas wet flue gas desulfurization gypsum, soil selects littoral saline and alkaline soil, and basicity ESP is 63.5%, and pH value is 8.38, soil sample salinity is greater than 1%, is high-basicity alkaline earth.
Embodiment 1: steel plant A sintering flue gas desulfurization adopts lime-gypsum method sulfur removal technology, gypsum to dewater briquetting via chamber filter press, and analyze its main chemical compositions in table 1 according to chemical analysis of gypsum method GB/T5484-2012, attached water is 26.70%, as calculated, CaSO
4account for 48.57%, content of beary metal meets the relevant criterion such as pollutant catabolic gene standard GB8173-87 in agricultural flyash, standard of soil environment quality (secondary) GB15618-1995 in table 2.Calculating this kind of sintered flue gas desulfurization gypsum improvement salt affected soil amount of application according to this method is 2000 ~ 6000kg/ mu, and actual amount of application is 4200kg/ mu, is evenly spread on salt affected soil surface, plow through tractor, this gypsum is mixed in topsoil, and divide and irrigate for four times, each water yield is 85m
3/ mu, gets pedotheque after each irrigation, air-dry sieve after, carry out water and soil mixing according to weight ratio 1:1, through stirring, after precipitation, drawing the soil liquid, measuring filtrate pH, electrical conductivity, salinity and ion concentration after filtering, in table 3.The known increase soil pH along with irrigation frequency declines, and electrical conductivity EC, salinity and ion concentration all significantly reduce, and when third time irrigates close to stable, the permeability of process of the test soil also makes moderate progress, and proves that the salinization and alkalization of salt affected soil improves.
Table 1 different enterprise desulfurated plaster main chemical compositions (mass fraction %)
(note: attached water represents with As-received; All the other are with dry basis representation)
Table 2 enterprise desulfurated plaster content of beary metal (mg/kg)
| Hg | As | Pb | Cr | Cd | Cu | Zn | Ni | |
| Steel plant A | <0.1 | <0.1 | 128.5 | <2.5 | <0.5 | 14 | 16 | 6 |
| Steel plant B | 4.2 | 8.8 | 52.0 | <2.5 | <0.5 | 19 | 19 | 2 |
Table 3 native fish test data
Embodiment 2: steel plant B sintering flue gas desulfurization adopts desulfurization method of limestone-gypsum technique, and analyze its main chemical compositions in table 1 according to chemical analysis of gypsum method GB/T5484-2012, attached water is 10.22%, as calculated, CaSO
4account for 63.37%, content of beary metal is except Hg content is a little more than standard of soil environment quality (secondary) GB15618-1995, other all meet the relevant criterion such as pollutant catabolic gene standard GB8173-87 in agricultural flyash, standard of soil environment quality (secondary) GB15618-1995, but consider that the amount of application of gypsum is less and only disposable employed, therefore on Hg content in soil substantially without impact.Calculating this kind of sintered flue gas desulfurization gypsum improvement salt affected soil amount of application according to this method is 1500 ~ 4700kg/ mu, and actual amount of application is 3000kg/ mu, is evenly spread on salt affected soil surface, plow through tractor, this gypsum is mixed in topsoil, and divide and irrigate for four times, each water yield is 90m
3/ mu, gets pedotheque after each irrigation, air-dry sieve after, carry out water and soil mixing according to weight ratio 1:1, stir, precipitation, and draw the soil liquid, after filtering, measure each leaching filtrate pH, electrical conductivity, salinity and ion concentration, in table 4.The known increase soil pH along with irrigation frequency declines, and electrical conductivity EC, salinity and ion concentration all significantly reduce, and when third time irrigates close to stable, the permeability of process of the test soil also makes moderate progress, and proves that the salinization and alkalization of salt affected soil improves.
Table 4 native fish test data
Claims (2)
1. utilize steel works sintering flue gas wet flue gas desulfurization gypsum to improve a method for saline-alkali soil, it is characterized in that comprising the steps:
1) gypsum slurries produced in wet desulphurization equipment is through precipitation, and after venting part clear liquid, adopt filter press briquetting, adsorbed water 10 ~ 30%, does not adopt vacuum or drying mode to dewater;
2) chemical composition analysis is carried out to sintering smoke wet method sulphur gypsum, comprise attached water, the crystallization water, CaO, SO
3, SO
2deng, and draw CaSO by conversion
4, CaSO
3content; CaSO in dry base
4content is 60 ~ 70%, and is not hydrolyzed to the salt constituents of alkalescence containing other; Analyze the content of its heavy metal, bioxin harmful substance simultaneously, directly use when heavy metal meets the concerned countries standard of agricultural and soil;
3) CaSO in the steel works sintering flue gas wet flue gas desulfurization gypsum used is ensured
4content is 1000kg ~ 3000kg/ mu, and earth's surface is shed and used, and by plowing, desulfurated plaster is mixed with topsoil, through irrigation or the rain of >3 time, and each 80 ~ 100 cubic metres/mu of the water yield.
2. utilize steel works sintering flue gas wet flue gas desulfurization gypsum to improve the method for saline-alkali soil according to claim 1, it is characterized in that improvement soil is moderate and alkaline-saline soil, pH is 8 ~ 10, basicity >20%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111167847A (en) * | 2020-01-06 | 2020-05-19 | 北京建工环境修复股份有限公司 | Novel ex-situ thermal desorption method and system for efficiently utilizing waste heat in cascade mode |
| CN112005649A (en) * | 2020-08-15 | 2020-12-01 | 刘学红 | Method for desulfurizing slag by semidry method |
| CN112205111A (en) * | 2020-07-21 | 2021-01-12 | 中国矿业大学(北京) | Method for improving soil of open pit coal mine dump by desulfurized gypsum |
| CN113390752A (en) * | 2021-06-15 | 2021-09-14 | 广西电网有限责任公司电力科学研究院 | Method for rapidly testing content of calcium sulfate in limestone wet desulphurization gypsum |
| CN114487025A (en) * | 2022-01-29 | 2022-05-13 | 中国建筑材料工业规划研究院 | Method for controlling content of crystal water in hydrate and application |
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| CN101544889A (en) * | 2009-05-18 | 2009-09-30 | 史汉祥 | Soil conditioner manufactured by the product after absorbing sulfur dioxide for improving alkali soil |
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| CN101544889A (en) * | 2009-05-18 | 2009-09-30 | 史汉祥 | Soil conditioner manufactured by the product after absorbing sulfur dioxide for improving alkali soil |
Non-Patent Citations (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111167847A (en) * | 2020-01-06 | 2020-05-19 | 北京建工环境修复股份有限公司 | Novel ex-situ thermal desorption method and system for efficiently utilizing waste heat in cascade mode |
| CN112205111A (en) * | 2020-07-21 | 2021-01-12 | 中国矿业大学(北京) | Method for improving soil of open pit coal mine dump by desulfurized gypsum |
| CN112005649A (en) * | 2020-08-15 | 2020-12-01 | 刘学红 | Method for desulfurizing slag by semidry method |
| CN113390752A (en) * | 2021-06-15 | 2021-09-14 | 广西电网有限责任公司电力科学研究院 | Method for rapidly testing content of calcium sulfate in limestone wet desulphurization gypsum |
| CN114487025A (en) * | 2022-01-29 | 2022-05-13 | 中国建筑材料工业规划研究院 | Method for controlling content of crystal water in hydrate and application |
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