CN101665844B - Method for preparing blast furnace slag micropowder by using sintering desulfuration byproducts as auxiliary materials - Google Patents
Method for preparing blast furnace slag micropowder by using sintering desulfuration byproducts as auxiliary materials Download PDFInfo
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- CN101665844B CN101665844B CN2009100936468A CN200910093646A CN101665844B CN 101665844 B CN101665844 B CN 101665844B CN 2009100936468 A CN2009100936468 A CN 2009100936468A CN 200910093646 A CN200910093646 A CN 200910093646A CN 101665844 B CN101665844 B CN 101665844B
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to a method for preparing blast furnace slag micropowder by using sintering desulfuration byproducts as auxiliary materials, belonging to the field of integrated utilization of key resources. The method comprises the following steps: stirring and mixing blast furnace slag output by a water-slag-washing pool of an iron mill with sintering desulfuration byproducts by a dry process and a semidry process uniformly to form a mixing material; reacting free water in the slag with free calcium oxide in the desulfuration byproducts while stirring to realize stable treatment of the free calcium oxide; drying the mixing material, oxidizing calcium sulfite in the desulfuration byproducts during the desorption of the free water to generate calcium sulfate; and passing the dried material through a grinder to form the blast furnace slag micropowder. After the desulfuration byproducts are doped into the slag, because the calcium oxide and the calcium sulfate are introduced into the desulfuration byproducts, the invention improves the reactivity of the slag micropowder, ensures that the slag micropowder can achieve corresponding specifications of national standard, and solves the difficulty of integrated utilization of the desulfuration byproducts by the dry process.
Description
Technical field
The invention belongs to the comprehensive utilization of resources field, particularly relating to a kind of is the method that auxiliary material prepares blast-furnace cinder micro-powder with the sintering desulfuration by product, utilize existing Iron and Steel Production operation, on to dry method semi-dry desulphurization by product pre-treatment basis, be used for slag micropowder production preparation.
Background technology
Iron and steel enterprise is SO
2Discharging rich and influential family, and the SO of sintering process discharging
2Account for the whole SO of iron and steel enterprise
290% of total emission volumn.Along with improving constantly of China's Economic development and environmental requirement, steel enterprise sintering flue gas desulfurization is extremely urgent, carries out sintering flue gas desulfurization and administers for the SO of iron and steel enterprise
2Reduce discharging, improve the control of air quality and regional acid rain and have positive effect.
The Eleventh Five-Year Plan outline clearly proposed, to national SO in 2010
2Total emission volumn cuts down 10% than " 15 " end of term.Point out in " national acid rain and sulfur dioxide pollution control Eleventh Five-Year Plan " that State Bureau of Environmental Protection is put into effect, implement 14 flue gas of sintering machine engineerings, work out steel industry sulfurous gas and reduce discharging planning, emphasis advances steel industry flue gas of sintering machine engineering, the Eleventh Five-Year Plan period, non-electric industry such as iron and steel forms 400,000 tons sweetening power, adjusted the emission standard of sintering gas flue gas sulfuric dioxide simultaneously, implement in full the pollutant discharging license system, the blue law responsibility, prevent and remedy pollution or the like, this all will promote to improve the emission standard of steel industry pollutent in accordance with the law, and it is imperative that sintering desulfuration is administered.
More sophisticated both at home and abroad at present sulfur removal technology has tens of kinds, but because the investment of dry sintering sulfur removal technology is low, occupation of land is little, water consumption is few, technology is simple, and overcome some problem and shortage that wet desulfurizing process exists well, become the main flow technology of steel enterprise sintering desulfurization gradually.But, had a strong impact on the comprehensive utilization of desulfurizing byproduct owing to contain higher calcium oxide and calcium sulfite in the sintering dry method semi-dry desulphurization by product.At present, also do not have both at home and abroad technology and the technology that can effectively handle and fully utilize preferably, cause desulfurizing byproduct mostly to store up disposal, this has not only taken a large amount of soils, and also surrounding enviroment has been caused serial problem in it is stored up.
Application number is that the patent " is the manufacture method of the cement of retardant with the desulfurization ash " of 200410015724.X has been described a kind of cement manufacturing method, with desulfurization ash as retardant, by cement clinker, desulfurization ash, flyash and blast-furnace slag with 80～98: 2～6: 0～15: 0～15 weight ratio prepares cement.
Application number is that 200610085414.4 patent " masonry cement " has been described a kind of desulphurize fly ash of utilizing the circular fluid bed discharging and prepared the method for inferior grade masonry cement for main raw material, and cement formula is: desulphurize fly ash 50%～70%, gypsum 2%～6%, cement clinker 24%～48%.
Application number is that 200610068783.2 patent " utilizing the Technology of desulphurize fly ash sintering sulfur aluminate cement " has been described a kind of Technology of utilizing desulphurize fly ash to prepare aluminosulfate cement by high-temperature calcination, this technology need not alumina, need not or only need a small amount of gypsum, just can realize the production of aluminosulfate cement.
Application number is that 200710003052.4 patent " is the method that raw material is made fiber with desulphurize fly ash calcium " and application number are that 200710003054.3 patent " a kind of desulphurize fly ash calcium fibre pulp and be the papermaking process of raw material " has been described and utilized desulphurize fly ash to prepare fibre pulp and be the papermaking process of raw material.
By retrieval, existing patent mainly concentrates on fields such as utilizing the preparation of power plant desulfurization ash cement setting retarder, masonry cement and cement baking, does not retrieve the relevant patent of utilizing power plant desulfurization ash preparation slag micropowder; Find no and close the patent of invention that sinter fume dry method semi-dry desulphurization byproduct comprehensive utilizes.
Summary of the invention
The object of the present invention is to provide a kind of is the method that auxiliary material prepares blast-furnace cinder micro-powder with the sintering desulfuration by product, utilize existing Iron and Steel Production operation, with the sintering dry desulphurization by product as auxiliary material, be used for slag micropowder production, use the sintering dry desulphurization by product to produce slag micropowder as auxiliary material, the stabilization of calcium oxide and the oxide treatment of calcium sulfite have been realized in process of production, improved the reactivity worth of slag powders, solve the comprehensive utilization difficult problem of dry desulfurization by product, can realize the extensive utilization of steel enterprise sintering dry desulfurization by product.
Technical scheme of the present invention be with the sintering dry desulphurization by product as auxiliary material, be used to prepare blast-furnace cinder micro-powder, the incorporation of desulfurizing byproduct is no more than 10% of blast-furnace slag (dry state), desulfurizing byproduct gross weight, makes the SO in the slag micropowder
3Content satisfies the requirement of national standard relevant regulations.
The blast-furnace slag water ratio of exporting from iron work flush slag pond is 10%～40%, with the blast-furnace slag exported in the iron work flush slag pond in proportion with sintering desulfuration by product stirring and evenly mixing, become mixture, when stirring, free-water in the slag and the free calcium oxide in the desulfurizing byproduct react, and realize the stabilization treatment of free calcium oxide; Mixture is dried subsequently, and in the free water removal process, the calcium sulfite generation oxidizing reaction in the desulfurizing byproduct generates calcium sulfate; Material after the oven dry carries out grinding, finally forms blast-furnace cinder micro-powder.
The slag micropowder of being produced, its chemical ingredients and reactivity worth satisfy the requirement of national standard relevant regulations.
The invention has the advantages that:
(1) utilizes existing Iron and Steel Production operation, in the certain working procedure that slag micropowder is produced, add the sintering dry desulphurization by product, because the mixing of dry method semi-dry desulphurization by product reduced the water ratio of water before the slag drying, reduced the production energy consumption of slag micropowder, promoted the development of recycling economy.
(2) utilize original slag micropowder production process, desulfurizing byproduct is mixed with moisture slag and drying after, realized the stabilization of calcium oxide in the dry desulfurization by product and the oxide treatment of calcium sulfite, for large utilization of desulfurizing byproduct is laid a good foundation.
(3) in slag, mix desulfurizing byproduct after because the introducing of calcium oxide, calcium sulfate in the desulfurizing byproduct, improved the reactivity worth of slag micropowder, can guarantee the slag micropowder performance respective specified that is up to state standards.
Description of drawings
Be illustrated in figure 1 as involved in the present invention a kind of be the process flow sheet that auxiliary material prepares blast-furnace cinder micro-powder with the sintering desulfuration by product.
Embodiment
In conjunction with Fig. 1 the specific embodiment of the present invention is described below:
Add desulfurizing byproduct in the slag of in iron work flush slag pond, exporting (moisture 10%～40%), and stir, in this process, realized the stabilization treatment of calcium oxide in the desulfurizing byproduct; The hygrometric state grain slag that is mixed with desulfurizing byproduct is dried, and under the high temperature in drying course, the oxidizing atmosphere, has realized the oxide treatment of calcium sulfite in the desulfurizing byproduct, generates calcium sulfate; Material after the oven dry generates slag micropowder by grinding.Because the introducing of calcium oxide, calcium sulfate in the desulfurizing byproduct, improved the reactivity worth of slag micropowder, can guarantee the slag micropowder performance respective specified that is up to state standards.
Embodiment 1
Simulated above-mentioned industrial application process by experiment:
With desulfurizing byproduct is that 20% water mixes towards slag in 0 (A sample), 3% (B sample), 7% (C sample), 10% (D sample), 12% (E sample) ratio and water ratio respectively, the material ratio is all calculated with butt weight of material ratio, 105 ℃ of following constant temperature 4 hours, material grinding to the specific surface area after will drying at last was 410m then
2/ kg.
Analyzed the influence of pure slag powder sample (A sample), 3% desulfurizing byproduct volume (B sample), 7% desulfurizing byproduct volume (C sample), 10% desulfurizing byproduct volume (D sample), 12% desulfurizing byproduct volume (E sample) to chemical ingredients, reactive behavior and the stability of slag micropowder.
" cement normal consistency water consumption, time of coagulation, the stability method of inspection " (GB/T 1346-2001) standard of employing is measured stability.
Activity index is measured: adopt the ultimate compression strength of " Test method for strength of hydraulic cement mortar (ISO method) " (GB/T 17671-1999) mensuration sample 7d, 28d, by contrasting the calculated activity index with the benchmark sample.
The sample measurement result sees Table 1:
Table 1 sample performance measurement result
| Sample | Desulfurizing byproduct volume/% | 7d activity index/% | 28d activity index/% | SO 3/％ | Stability |
| The A sample | 0 | 102 | 113 | 3.00 | Qualified |
| The B sample | 3 | 111 | 119 | 3.18 | Qualified |
| The C sample | 7 | 107 | 115 | 3.42 | Qualified |
| The D sample | 10 | 101 | 110 | 3.60 | Qualified |
| The E sample | 12 | 94 | 106 | 3.72 | Qualified |
As shown in table 1, be 3%, 7%, 10% o'clock at the desulfurizing byproduct volume, 7d, 28d activity index all are better than benchmark sample A sample, and are 12% o'clock at the desulfurizing byproduct volume, and then activity index is relatively poor than the benchmark sample.Each sample SO
3Content and stability all meet the relevant national standard requirement.
Therefore, the present invention can be not more than at 10% o'clock at the desulfurizing byproduct volume, and prepared composite powder performance satisfies the relevant national standard requirement.
Claims (2)
1. one kind is the method that auxiliary material prepares blast-furnace cinder micro-powder with the sintering desulfuration by product, it is characterized in that: with the blast-furnace slag exported in the iron work flush slag pond in proportion with sintering dry method semi-dry desulphurization by product stirring and evenly mixing, become mixture, when stirring, free-water in the slag and the free calcium oxide in the desulfurizing byproduct react, and realize the stabilization treatment of free calcium oxide; Mixture is dried subsequently, and in the free water removal process, the calcium sulfite generation oxidizing reaction in the desulfurizing byproduct generates calcium sulfate; Material after the oven dry carries out grinding, finally forms blast-furnace cinder micro-powder;
The incorporation of desulfurizing byproduct is no more than 10% of dry state blast-furnace slag, desulfurizing byproduct gross weight, makes the SO in the slag micropowder
3Content satisfies the requirement of national standard relevant regulations.
2. it is characterized in that in accordance with the method for claim 1: the scoriaceous weight in wet base of pulling out in the described iron work flush slag pond is 10%～40%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100936468A CN101665844B (en) | 2009-10-14 | 2009-10-14 | Method for preparing blast furnace slag micropowder by using sintering desulfuration byproducts as auxiliary materials |
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| CN2009100936468A CN101665844B (en) | 2009-10-14 | 2009-10-14 | Method for preparing blast furnace slag micropowder by using sintering desulfuration byproducts as auxiliary materials |
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| CN101665844A CN101665844A (en) | 2010-03-10 |
| CN101665844B true CN101665844B (en) | 2010-12-01 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103708753A (en) * | 2013-12-06 | 2014-04-09 | 马钢(集团)控股有限公司 | Applications of semi-dry desulphurization product and usage method |
| CN105384375A (en) * | 2015-12-14 | 2016-03-09 | 文登蓝岛建筑工程有限公司 | Active admixture for building materials |
| CN106064172B (en) * | 2016-05-31 | 2018-02-23 | 武汉钢铁有限公司 | CaSO in a kind of Desulphurization3Stabilization method |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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