CN105985033A - Method for treating and utilizing electric furnace circulating water sludge - Google Patents

Abstract

The invention relates to a method for treating and utilizing electric furnace circulating water sludge. The method comprises the steps that the adopted electric furnace sludge is calcined at the temperature of 820 DEG C to 880 DEG C, the temperature rise rate is controlled to range from 5 DEG C/min to 20 DEG C/min, and after the temperature is raised to specified temperature, the temperature is preserved for 0.5 h to 2 h; the obtained calcined sludge is smashed till D50 ranges from 5 micrometers to 30 micrometers. Compared with cement kiln consumption conventional utilization ways, the sludge calcination temperature is low, and the advantage of being low in energy consumption is achieved. The calcined sludge is recycled, oxide of aluminum, calcium and silicon rich in the sludge is utilized, the activity is improved after calcination, the sludge is used as a cement admixture, and effective utilization of the components of the sludge is achieved.

Description

A kind of electric furnace Treatment of Sludge in Circulating Water and Application way

Technical field

The present invention relates to offal treatment and utilize field, being specifically related to process and the Application way of a kind of electric furnace circulating sludge.

Background technology

At present, mud is limited primarily to urban water plant mud in the application of building material industry.This is because urban water plant mud belongs to general Solid waste, Leaching Heavy Metals meets GB5085.3-1996 " hazardous waste judging standard " regulation.Urban water plant mud is made At home and abroad have for building material and study widely.Building trade raw material resources belongs to unsustainable resource, and country encourages energetically With the theory of promotion " green building material ", it is badly in need of finding the raw material substituted.Building material industry is a huge field, needs big The raw material of amount.At present, building material industry is that maximum solid waste produces industry, and the solid waste being also simultaneously maximum is dissolved industry.

Utilize mud to manufacture cement-based material as raw material, except resource, the making full use of of the energy can be realized, also can have therein Poison, harmful substance neutralize and sponge, and really thoroughly eliminate mud neatly, make harm be minimized, and these are existing many abroad Successfully example.The eco-cement produced such as Zhi Fu little Ye field company of Japan utilizes city garbage incinerator lime-ash and sewer exactly Mud is as raw material.Additionally, utilizing cement kiln to process mud is a kind of not only safety but also economic method, can save dirt in a large number The investment of mud incinerator, is also the important road of urban sustainable development.

Traditional method for sludge treatment has landfill, compost and burning etc..Comparative study shows, it is the most thorough that burning method processes mud The end, burning method has its significant advantage: can reduce sludge volume in burning process to greatest extent, it is achieved minimizing；Can make The whole carbonization of Organic substance, kills pathogen, farthest reduces heavy metal activity, it is possible to more thoroughly accomplish stability and nothing Evilization；Meanwhile, sludge calorific value during sludge incineration, can be made full use of, for mummification and the power generation and heat supply of mud self, burn Ashing can be made into building materials, it is achieved resource.

The residue of burning sludge resource in civil engineering material, it may be considered that: 1. as cement mixture, raw material or combustion Material；2. make thick, the fine aggregate of concrete, replace natural sandstone；3. concrete mineral additive (admixture) is made.Burn dirt Mud residue is used for cement concrete, it is necessary to follow following two principle: 1. environment can not be caused secondary pollution；2. can not be to mixed Coagulate the performance especially endurance quality of soil and have a negative impact service life.

Traditional method fills costly, and in mud, component does not get utilization.Compost inapplicable electric furnace circulating sludge. Because the electric furnace Sludge in Circulating Water content of organic matter is low, incineration treatment method is also unsuitable for processing electric furnace Sludge in Circulating Water.

Summary of the invention

Therefore, the technical problem to be solved in the present invention is to provide process and the Application way of a kind of electric furnace Sludge in Circulating Water.

The technical scheme is that, a kind of electric furnace Treatment of Sludge in Circulating Water and Application way, by electric furnace mud used from room temperature liter To 820 DEG C～880 DEG C calcine, control heating rate be 5～20 DEG C/min, the most at such a temperature insulation 0.5h～ 2h；It is 5～30 μm that the calcining mud of gained is crushed to d50 again.

D50 represents the diameter (or claiming 50% to pass through particle diameter) of accumulative 50%.The present invention 50% passes through size controlling 5～30 μm。

For ensureing that in mud, active component occurs to change stimulating activity at a certain temperature, considers to save energy consumption cost, mud simultaneously Calcining heat 820～880 DEG C.For ensureing the economy exciting and operating of active component activity, mud calcination time in mud It is 0.5～2h, less than 0.5 hour, the most active impacted；More than 2 hours, then cost was the highest.For improving calcining dirt further Property if mud, considers the economy of operation simultaneously, and after calcining sludge residue is pulverized, particle diameter to control within the specific limits, best D505～30 μm.

A kind of electric furnace Treatment of Sludge in Circulating Water according to the present invention and Application way, it is preferred that described electric furnace mud is steel mill The mud that electric furnace circulating water treatment produces, mud butt composition Al₂O₃30～60wt%, SiO₂5～20wt%, CaO 5～ 10%, total Fe 5～15%, MnO 0.5～10%, MgO 0.5～5%, TC 0.5～10%.

Preferably, the method that calcining mud is pulverized is ball milling or steam mill.

Preferably, the coagulant that in described circulating water treatment, coagulating kinetics uses is aluminium salt class coagulant.

Further, described aluminium salt class coagulant is selected from aluminium polychlorid, aluminum chloride or aluminum sulfate.

The present invention is to provide process and the Application way of a kind of steel mill electric furnace circulating water treatment mud, utilize in mud rich in Aluminum, silicon, calcareous active component are calcined exciting of hydration activity at a certain temperature, and are kept certain time；The nothing of calcining gained Machine residue, by ball milling or steam mill by the way of be processed into micropowder, the product of gained can individually or with flyash, breeze etc. Other mixing materials are mixed, again as cement active mixed material.Sludge in Circulating Water is because of containing quantitative Organic substance such as oils simultaneously, rich Containing certain calorific value, can partly compensate calcining institute calorific requirement.

--precipitation--technique of filtration that the circulating water treatment of the electric furnace operation that iron and steel produces typically uses coagulation, the mud of generation removes water Point and Organic substance outside, inorganic component mainly aluminum, siliceous be main, with enter containing quantitative calcareous, irony composition.

Quality coefficient K reflects the proportionate relationship in mixing material between active constituent and low activity, inert ingredient.GB/T203 -2008 " granulated blast-furnace slag in cement " specifies, quality coefficient more than 1.2 for active mixed material, less than 1.2 For nonactive mixing material.Quality coefficient K value is the biggest, and mixture activity is the highest.In theory, according to steel mill's Sludge in Circulating Water Inorganic chemistry composition calculates, generally its K value ＞ 2, so Sludge in Circulating Water has the basis becoming activity mixed material.

$K=\frac{{\mathrm{\ω}}_{\mathrm{CaO}}+{\mathrm{\ω}}_{\mathrm{MgO}}+{\mathrm{\ω}}_{{\mathrm{Al}}_2{O}_3}}{{\mathrm{\ω}}_{\mathrm{Si}{O}_2}+{\mathrm{\ω}}_{\mathrm{Tl}{O}_2}+{\mathrm{\ω}}_{\mathrm{MnO}}}$

In formula:

The quality coefficient of K sample；

ω_CaO、ω_MgO、ω_Al2O3、ω_SiO2、ω_TiO2、ω_MnORepresent the mass fraction/% of respective components in sample respectively；

Aluminium salt is used to make the aluminum matter in the Sludge in Circulating Water mud of coagulant, the inorganic component such as siliceous the most treated general with nonactive Form, such as hydras, the SiO2 etc. of setting of aluminum；When mud through calcining and activating process, in mud rich in aluminum, siliceous group Point calcining can be formed unbodied aluminium sesquioxide, silicon dioxide thus there is certain activity；Inactive Al2O3 therein Crystal formation or hydras can be changed into the Al2O3 crystal formation such as γ-Al2O3 of activity.Nonactive crystal formation is mutual with activity crystal formation Conversion needs suitable thermotonus condition, and this condition there are differences with mud component difference.

The micronization of mixing material is the effective means improving its activity, represent the case of type have slag micropowder, Slag super-fine powder, Steel-making slag powder and flyash etc., because the difference of the raw material chemical composition highly active particle size range of each material exists significant difference.Steel mill Inorganic residues after Sludge in Circulating Water calcining size-reduced is micronized to suitable particle size interval, and activity excitation can ensure that higher work Property, thus be suitable for use as mixing material.

The composition of steel mill's electric furnace Sludge in Circulating Water is mainly moisture content, Organic substance and inorganic matter, in mud calcination process, and moisture content quilt Evaporation, the organic component of low ignition point can be decomposed by exhaustive oxidation, the size-reduced micronization of remaining inorganic residues and be used as cement mix And material, thus realize safe handling and the utilization of mud.

The present invention is by using technique scheme so that it has a following beneficial effect:

1. mud calcining heat is relatively low, and dissolving with cement kiln utilizes conventional route to compare, and has the advantage that energy consumption is low.Water Stall temperature is typically more than 1100 DEG C, and clinker discharging is typically at 1350 DEG C.

2. recycling calcining mud, utilize in mud rich in aluminum, calcium, the oxide of silicon, activity carries after firing Rise so that it is as cement mixture, it is achieved that effective utilization of mud component.

3. taking full advantage of mud self because of contained Organic substance, self calorific value part compensate for the heat needed for mud calcining.

4. achieving the safe disposal of mud, the combustion oxidation in calcination process of the Organic substance in mud decomposes, inorganic residues portion Utilize as cement mixture after divisional processing.

Detailed description of the invention

Embodiment 1

Certain electric furnace operation Sludge in Circulating Water, calcines and is incubated 1h by this mud rising to 850 DEG C with 10 DEG C/min programming rate, dirty Mud calcining residue is ground into the micropowder that d50 is 12 μm in the way of ball milling, and the compressive strength rate of micropowder 28d (is lived after tested Sex index) it is 81%, meet the requirement of GB/T2847-2005 " the volcano grey matter mixed material in cement " 65%；Ginseng According to GB/T20491-2006 " steel-making slag powder in cement and concrete ", reach one-level steel-making slag powder to activity index 80% Requirement；After calcining, sludge chemical composition is shown in Table 1, it can be seen that Organic substance (TC) is efficiently removed, and its quality coefficient K It is 5.03.

(%) is formed after the calcining of electric furnace Sludge in Circulating Water

CaO

SiO2

MgO

Al2O3

TiO2

MnO

TFe

TC

After calcining

5.2

9.7

0.8

50.3

<0.1

1.5

11.5

<0.1

Embodiment 2

Certain electric furnace Sludge in Circulating Water, calcines and is incubated 1.5h, mud by this mud rising to 830 DEG C with 15 DEG C/min programming rate Calcining residue is ground into the micropowder that D50 is 6 μm, the after tested compressive strength rate (activity of micropowder 28d in the way of steam mill Index) it is 74%, meet the requirement of GB/T2847-2005 " the volcano grey matter mixed material in cement " 65%；Reference GB/T20491-2006 " steel-making slag powder in cement and concrete ", reaches two grades of steel-making slag powder wanting activity index 65% Ask；Before and after calcining, sludge chemical composition is shown in Table 2, it can be seen that Organic substance (TC) is efficiently removed, and its quality coefficient K It is 2.86.

(butt) (%) is formed after the calcining of electric furnace Sludge in Circulating Water

	CaO	SiO2	MgO	Al2O3	TiO2	MnO	TFe	TC
									After calcining	12.6	14.4	1.4	34.7	0.4	2.2	8.9	<0.1

Embodiment 3

Certain electric furnace Sludge in Circulating Water, calcines and is incubated 0.5h, mud by this mud rising to 870 DEG C with 20 DEG C/min programming rate Calcining residue is ground into the micropowder that D50 is 20 μm, the after tested compressive strength rate (activity of micropowder 28d in the way of ball milling Index) it is 76%, meet the requirement of GB/T2847-2005 " the volcano grey matter mixed material in cement " 65%；Reference GB/T20491-2006 " steel-making slag powder in cement and concrete ", reaches two grades of steel-making slag powder wanting activity index 65% Ask；Before and after calcining, sludge chemical composition is shown in Table 3, it can be seen that Organic substance (TC) is efficiently removed, and its quality coefficient K It is 2.45.

(%) is formed after the calcining of electric furnace Sludge in Circulating Water

	CaO	SiO2	MgO	Al2O3	TiO2	MnO	TFe	TC
									After calcining	6.8	16.3	2.8	42.2	0.2	4.6	6.6	<0.1

The present invention has considered mud recycling in building materials and the environmental safety of metallurgical mud, is forged by certain Firing technique, under the calcining heat that relative clinker is the lowest, makes the activity of iron and steel enterprise's electric furnace Sludge in Circulating Water be excited, Make it meet the cement-based material performance requirement to active mixed material, and reduce calcinating consumption as much as possible.This invention is further The new way that perfect metallurgical recycling sludge utilizes, utilizes with sludge incineration and landfill is compared, more directly, more effectively.? On recycling sludge utilization ways, complying fully with country's development strategy about " energy-saving and emission-reduction ", having extraordinary exploitation should Use prospect.

Claims (5)

1. an electric furnace Treatment of Sludge in Circulating Water and Application way, it is characterised in that: electric furnace mud used is risen to 820 from room temperature DEG C～880 DEG C at a temperature of calcine, control heating rate be 5～20 DEG C/min, the most at such a temperature insulation 0.5h～2h；Institute It is 5～30 μm that the calcining mud obtained is crushed to d50 again.

A kind of electric furnace Treatment of Sludge in Circulating Water the most according to claim 1 and the method for utilization, it is characterised in that described Electric furnace mud be the mud that steel mill electric furnace circulating water treatment produces, mud butt composition Al₂O₃30～60wt%, SiO₂5～ 20wt%, CaO 5～10%, total Fe 5～15%, MnO 0.5～10%, MgO 0.5～5%, TC 0.5～10%.

A kind of electric furnace Treatment of Sludge in Circulating Water the most according to claim 1 and the method for utilization, the side that calcining mud is pulverized Method is ball milling or steam mill.

A kind of electric furnace Treatment of Sludge in Circulating Water the most according to claim 2 and the method for utilization, it is characterised in that described The coagulant that in circulating water treatment, coagulating kinetics uses is aluminium salt class coagulant.

A kind of electric furnace Treatment of Sludge in Circulating Water the most according to claim 4 and the method for utilization, it is characterised in that described Aluminium salt class coagulant is selected from aluminium polychlorid, aluminum chloride or aluminum sulfate.