CN104928419A - Method of using coal chemical industry waste water to treat directly-reduced iron melt separation slag to produce water-quenched slag - Google Patents
Method of using coal chemical industry waste water to treat directly-reduced iron melt separation slag to produce water-quenched slag Download PDFInfo
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Abstract
The invention discloses a method of using coal chemical industry waste water to treat directly-reduced iron melt separation slag to produce water-quenched slag. The method includes: feeding directly-reduced iron generated by a direct-reduction vertical furnace into a melt-separation electric furnace; obtaining melt separation slag through slag-iron separation; utilizing high-temperature sensible heat of the melt separation slag; using concentrated coal chemical industry waste water to perform water-quenching treatment on the melt separation slag to obtain the water-quenched slag serving as a raw material for cement production. By the method, impurity content of waste heat smelting directly-reduced iron is lowered, and purity of directly-reduced iron melt is improved; the coal chemical industry waste water is utilized for water-quenching treatment of the directly-reduced iron melt separation slag to generate the water-quenched slag used for producing cement, so that harmful waste water is changed into a useful resource, and near-zero emission and waste heat utilization of industrial production waste water of coal chemistry industry, metallurgy and power generation.
Description
Technical field
The present invention relates to the comprehensive utilization of industrial waste, particularly relate to and a kind ofly fully utilize during coal chemical industrial waste water and direct-reduced iron are produced the method producing waste residue.
Background technology
After the blast furnace slag that blast furnace ironmaking produces carries out Water Quenching, can produce Water Quenching Slag, the Water Quenching Slag produced at present is mainly used as the raw material of manufacture of cement.
Generally, steel scrap and direct-reduced iron directly add for steel-making in steel melting furnace, and solid-state direct-reduced iron is melted into molten steel and liquid steel slag in steelmaking process, utilize the different of liquid steel slag and molten steel proportion, liquid steel slag is separated with molten steel.The slag produced can directly carry out Water Quenching and obtains utilizable Water Quenching Slag unlike blast furnace slag because in slag containing a small amount of metallic iron and there is certain viscosity do not clear up lime particulate, by its production Water Quenching Slag, the quality of cement can be had a strong impact on.Be adopt hot vexed slag method to process slag at present, hot vexed slag method utilizes steel slag waste heat, produces a large amount of steam after adding cold water in container with lid, the CaO in slag being cleared up, reaching the object of slag sluicing system by expanding with heat and contract with cold.Steel-slag performance after the vexed process of heat, eliminates the impact of free state CaO on slag performance, can as the raw material of slag micro powder, steel slag building block brick etc.
No. 2013101947061 method of comprehensive utilization that patent discloses a kind of high temperature rough gas waste heat overbottom pressure residual air, be by high-temperature dust removal after high temperature rough gas be transported to and be filled with in the reduction shaft furnace of iron ore_coal pellet, pass from iron ore_coal pellet moving particles bed, through the dedusting of iron ore_coal pellet moving granular bed, and heating iron ore briquet is to produce direct-reduced iron; Stock gas is for the production of after Chemicals, and residual gas is used for industrial combustion gas or combined combustion and steam turbine power.
No. 2010101245421 patent discloses a kind of method utilizing sensible heat of raw gas to produce direct-reduced iron, raw gas grain bed hot precipitator is made so that direct-reduction shaft furnace is double, iron ore in shaft furnace (comprises iron ore_coal pellet, iron oxide pellet nodulizing, coal parcel powdered iron ore pelletizing) doublely do moving granular bed dedusting particle, coproduction direct-reduced iron in the process to high temperature rough gas dedusting, complete simultaneously and utilize sensible heat, reduced iron, cooling, dedusting, reduce gas pressure 5 functions in reduction shaft furnace, from reduction shaft furnace the stock gas of output after purification for the production of the unstripped gas of Chemicals or combustion gas, can effectively improve Coal Energy Source comprehensive utilization ratio.
Above two patents are owing to have employed iron ore_coal pellet raw material, ash content in coal enters in direct-reduced iron, become the impurity in direct-reduced iron, make steel if direct-reduced iron more for this impurity is directly added in steel melting furnace, more slag can be produced, have influence on the quality of steel, therefore can only smelt general steel, be difficult to smelt Clean Steel and high-quality steel.
A large amount of coal chemical industry sewages can be produced in Coal Chemical Industry production process.Be generally water in first adopting sewage purification technology to recycle at present, remaining strong brine, organic strong sewage are joined sewage crystallization processes with evaporation pool again and are processed.The Evaporation of evaporating pool winter significantly declines, and has sewage to overflow the risk of dike, there is again the risk of meeting heavy rain and inrushing summer.Sewage evaporation crystallization treatment not only consumes a large amount of heat energy, also there is the reprocessing of xln pollutent and long-term problem of preserving, and adds a new dangerous contamination source.
Summary of the invention
The object of this invention is to provide a kind of coal chemical industrial waste water process direct-reduced iron and melt a point method for slag production Water Quenching Slag, to reduce the foreign matter content in direct-reduced iron.
Utilizing the molten point slag of coal chemical industrial waste water process direct-reduced iron, effectively to process coal chemical industrial waste water, is another goal of the invention of the present invention.
It is loaded by the direct-reduced iron of direct-reduction shaft furnace output in molten point electric furnace that coal chemical industrial waste water process direct-reduced iron of the present invention melts a point method for slag production Water Quenching Slag, after fusing, slag iron gravity separation obtains molten point slag, utilize the high temperature sensible heat of molten point slag, use concentrated coal chemical industrial waste water to carry out Water Quenching to a molten point slag, obtain can be used as the Water Quenching Slag of producing cement raw material.
The concrete grammar of technique scheme of the present invention is:
A) coal chemical industrial waste water is through sewage purification process process, after the Treated sewage reusing of generation, collects residue sewage, is concentrated into 5 ~ 10% of coal chemical industrial waste water cumulative volume;
B) in iron ore_coal pellet raw material, allocate the calcic inorganic material accounting for iron ore_coal pellet quality 0.1 ~ 10% into, produce the iron ore_coal pellet being furnished with calcic inorganic material, be seated in direct-reduction shaft furnace, pass into gas maked coal height temperature rough gas, utilize the sensible heat of gas maked coal height temperature rough gas to smelt direct-reduced iron;
C) loaded by the direct-reduced iron of direct-reduction shaft furnace output in molten point electric furnace, slag sluicing system, obtains direct-reduction molten iron for steel-making, and obtains the molten point slag of 1400 ~ 1600 DEG C;
D) with 1400 ~ 1600 DEG C of molten point slags that the above-mentioned concentrated direct punching of residue sewage is come out of the stove, Water Quenching obtains Water Quenching Slag, as cement producting material.
Wherein, described calcic inorganic material is the one in lime powder, slaked lime powder, light dolomite powder, ground dolomite, ground silica, glass powder, spoil powder, wilkinite, flyash, or several arbitrary proportion mixtures.
In the present invention, described coal chemical industrial waste water residue sewage is strong brine and/or the strong sewage containing organic pollutant.
Further, described strong sewage containing organic pollutant and strong brine can be respectively used to punching Water Quenching Slag, for punching Water Quenching Slag after also can mixing.Usually, process Water Quenching Slag and compare with mixing, use strong brine or the strong sewage containing organic pollutant respectively punching Water Quenching Slag appropriateness can reduce the energy consumption of process.
One of feature of the present invention is the carbonaceous pelletizing of reductive agent in order to coal, as Carbon Composite Iron Ore Hot Briquette etc. produces direct-reduced iron, and by the molten point slag punching Water Quenching Slag of direct-reduced iron.Wherein use electric furnace molten point slag and molten iron, purer molten iron can be obtained for steel-making, and tapping temperature reaches 1400 ~ 1600 DEG C of molten point slags, then obtain Water Quenching Slag with the molten point slag of coal chemical industrial waste water residue sewage Water Quenching.
Two of feature of the present invention is in iron ore_coal pellet, allocate calcic inorganic material into, both produces the high-temperature agglomerant of direct-reduced iron as iron ore_coal pellet, the chemical composition again for regulating direct-reduced iron to melt point slag.Direct-reduced iron melts point slag and derives from ash content in powdered iron ore and coal, and identical with blast furnace slag is all contain SiO
2, Al
2o
3, Fe
2o
3, MnO, CaO, MgO and a small amount of S, unlike with the addition of lime, rhombspar in blast furnace ironmaking process, its objective is the basicity in order to improve blast furnace slag, to improve the mobility of blast furnace slag, and then improving the smelting performance of blast furnace and the quality of molten iron.The molten point slag of direct-reduced iron compares with blast furnace slag, and its CaO, content of MgO are lower.In order to supplementary direct-reduced iron melts CaO, the MgO lacked in point slag, the present invention is when making iron ore_coal pellet, allocate the high-temperature agglomerant of the mixture of one or more in the calcic inorganic materials such as lime powder, slaked lime powder, light dolomite powder, ground dolomite, ground silica, glass powder, spoil powder, wilkinite, flyash as direct-reduced iron reduction process into, the amount of allocating into 1 ~ 15%.The mineral binder bond allocated into becomes molten point slag ingredient after molten point of direct-reduced iron, makes the molten point slag ingredient of direct-reduced iron reach following table index, unanimous on the whole with blast furnace slag composition.
Three of feature of the present invention is the high temperature sensible heats utilizing molten point slag, uses coal chemical industrial waste water residue sewage (strong brine and/or the strong sewage containing organic pollutant) the shrend molten point of slag production grain slag after concentrating.After smelting direct-reduced iron by shaft furnace waste heat; again direct-reduced iron is divided by molten point electric furnace is molten; make slag sluicing system; when the molten point slag tapping temperature of direct-reduced iron electric furnace reaches 1400 ~ 1600 DEG C; carry out Water Quenching with coal chemical industrial waste water residue sewage, the every physical and chemical index of the Water Quenching Slag obtained reaches GB/T 18046-2008 " granulated bf slag in cement " standard-required.
Four of feature of the present invention is that the calcic inorganic material added imparts the new function of iron ore_coal pellet.When adding lime, slaked lime, light dolomite etc. in iron ore_coal pellet, when making CaO mass percentage >=8% in iron ore_coal pellet, the generation that in direct-reduced iron reduction process, within the scope of 900 ~ 1050 DEG C, iron must be brilliant can be eliminated, also the growth that iron palpus is brilliant can be suppressed during CaO mass percentage 3 ~ 8%, thus it is brilliant to avoid generating iron palpus in iron ore_coal pellet reduction process, cause the undesirable extention of pelletizing, with the hot strength keeping iron ore_coal pellet required in Direct Reduction.
Five of feature of the present invention uses the molten point direct-reduced iron of molten point electric furnace to be separated molten point slag.Sink in molten point molten iron to enable direct-reduced iron, direct-reduced iron is carried out hot wafering by the present invention, add in the molten iron of molten point electric furnace after increasing proportion, or use special feeder to be added by direct-reduced iron in molten point electric furnace molten iron, to ensure that the molten point slag of direct-reduced iron fully dissolves.
Six of feature of the present invention is the crystallization processes that instead of coal chemical industrial waste water residue sewage with Water Quenching.Utilize existing sewage purification process flow process, after Treated sewage reusing, remaining strong brine and/or the molten point slag of the strong sewage shrend direct-reduced iron containing organic pollutant produce Water Quenching Slag, salinity in residue sewage and organic pollutant are attracted in Water Quenching Slag, bring in the process procedure preparing cement and do further process, eliminate sewage crystallization and ingot solid is sealed up for safekeeping, not only can eliminate a permanent industrial pollution source, the process energy consumption of sewage crystallization can also be saved, realize the near zero release of the industrial sewages such as Coal Chemical Industry, metallurgy, electric power.Generally speaking, the molten point quantity of slag of direct-reduced iron is less, and it is comparatively large to originate in coal chemical industrial waste water amount, therefore needs by coal chemical industrial waste water first through sewage purification Treated sewage reusing, and concentrated residue sewage is used further to punching Water Quenching Slag after 5 ~ 10% of raw wastewater amount.
Seven of feature of the present invention the strong brine that Coal Chemical Industry, metallurgy, generating produce can be separated with strong sewage, is respectively used to punching Water Quenching Slag.Strong sewage mainly containing having pollution machine thing in a large number, as the coal chemical industrial waste water of tar, ammonia, phenol, prussiate, COD etc., with the Water Quenching Slag of its punching, needs to heat under the oxidizing atmosphere of 800 ~ 1300 DEG C, to guarantee that organic pollutant oxygenolysis becomes CO
2and H
2o, generally selects cement rotary kiln or shaft furnace to carry out calcination processing.And with not containing after the strong brine punching Water Quenching Slag of organic pollutant, after only need drying with the hot blast of more than 100 DEG C or waste heat gas, the slag powders of production cement can be become after corase grind, fine grinding, with other cement ingredient together abrasive dust production cement.Therefore, by strong brine and strong sewage punching Water Quenching Slag respectively, drying respectively or high temperature oxidation process, reducing process energy consumption than both being mixed process Water Quenching Slag.
Eight of feature of the present invention is that processing method is flexible.Direct-reduced iron melts point production technique of slag punching Water Quenching Slag and production unit is selected flexibly, and the processing methodes such as " OCP " method (end filter method), " RASA " method (Lhasa method), " INBA " method (Yin Bafa) all can adopt.
Nine of feature of the present invention is that lectotype selection is flexible.Molten point of direct-reduced iron can configure two electric furnaces, a molten point direct-reduced iron, and another is for steel-making; Also only can configure an electric furnace, time sharing segment is used for molten point direct-reduced iron or a steel-making.
The present invention is by first dividing direct-reduced iron with electric furnace is molten, again by the technique of direct-reduction molten iron steel-making after slag sluicing system, solve waste heat and smelt the more problem of direct-reduction iron contamination, to reduce the direct-reduced iron steel-making of foreign matter content, improve the purity of direct-reduction molten iron, decrease slag amount, improve the quality of steel.
The present invention utilizes the molten point slag of coal chemical industrial waste water Water Quenching direct-reduced iron, and the Water Quenching Slag of generation is for the production of cement.In the process of producing cement, moisture evaporates, and organism high temperature oxidation resolves into H
2o and CO
2, inorganic salt are cured in cement, and harmful waste water is become useful resource.
The enforcement of aforesaid method of the present invention, achieve near zero release and the UTILIZATION OF VESIDUAL HEAT IN of the industrial production wastewaters such as Coal Chemical Industry, metallurgy, generating, environmental protection and energy saving, can effectively promote the industrial construction recycling economy ecological Industrial Area such as Coal Chemical Industry, iron and steel, electric power, nonferrous metallurgy, building materials.
Embodiment
Embodiment 1
By saliferous coal chemical industrial waste water through sewage purification process process, produce Treated sewage reusing, and collect residue sewage, be concentrated into 5% of raw wastewater volume, obtain the strong brine concentrated.
With fine iron breeze 65 ~ 80kg, mixed coal powder 10 ~ 22kg, binding agent 2 ~ 6kg, lime powder 2kg, slaked lime powder 3kg, flyash 2kg for raw material, mix and make iron ore_coal pellet.
Coal ash fusion temperature is selected to be raw material higher than the coal of direct-reduced iron reduction temperature at least 200 DEG C, raw gas is produced in coal-made gas furnace, when the raw gas temperature in coal-made gas furnace reaches 1000 ~ 1150 DEG C, through tornado dust collector dedusting, be transported in direct-reduction shaft furnace by the bustle pipe be located in reduction shaft furnace, the iron ore_coal pellet made loaded in direct-reduced iron shaft furnace through feeding lock hopper simultaneously.The raw gas entering reduction shaft furnace passes from iron ore_coal pellet moving granular bed, and heating iron ore briquet is to produce direct-reduced iron.Direct-reduced iron erects furnace inner gas pressure 6 ~ 8kg, N bottom reduction shaft furnace
2envelope gaseous tension is greater than direct-reduced iron and erects furnace inner gas pressure, while guaranteeing that in direct-reduced iron shaft furnace, reducing gas does not leak, and direct-reduced iron N bottom reduction shaft furnace of generation
2envelope discharge port, at N
2shaft furnace is discharged under protective atmosphere.
Added in molten point electric furnace by the direct-reduced iron of output with feeder, direct-reduced iron melts in electric furnace, makes slag sluicing system, obtains direct-reduction molten iron for steel-making, and obtains the molten point slag of 1400 ~ 1600 DEG C.
By INBA grain slag production process equipment, with the molten point slag of above-mentioned concentrated strong brine punching 1400 ~ 1600 DEG C, obtain being used as cement raw material after Water Quenching Slag is dried.
Embodiment 2
Containing organism coal chemical industrial waste water through sewage purification process process, Treated sewage reusing will be produced, and collect residue sewage, and be concentrated into 5% of raw wastewater volume, obtain the organic strong sewage concentrated.
With fine iron breeze 65 ~ 80kg, mixed coal powder 10 ~ 22kg, binding agent 2 ~ 6kg, lime powder 2kg, slaked lime powder 3kg, flyash 2kg for raw material, mix and make iron ore_coal pellet.
Coal ash fusion temperature is selected to be raw material higher than the coal of direct-reduced iron reduction temperature at least 200 DEG C, raw gas is produced in coal-made gas furnace, when the raw gas temperature in coal-made gas furnace reaches 1000 ~ 1150 DEG C, through tornado dust collector dedusting, be transported in direct-reduction shaft furnace by the bustle pipe be located in reduction shaft furnace, the iron ore_coal pellet made loaded in direct-reduced iron shaft furnace through feeding lock hopper simultaneously.The raw gas entering reduction shaft furnace passes from iron ore_coal pellet moving granular bed, and heating iron ore briquet is to produce direct-reduced iron.Direct-reduced iron erects furnace inner gas pressure 6 ~ 30kg, and the direct-reduced iron of generation is discharged by discharge port after lock hopper lower bottom reduction shaft furnace loses heart decompression, is pressed into hot wafering by press.
Added in molten point electric furnace by the direct-reduced iron hot wafering of output with feeder, direct-reduced iron melts in electric furnace, makes slag sluicing system, obtains direct-reduction molten iron for steel-making, and obtains the molten point slag of 1400 ~ 1600 DEG C.
By INBA grain slag production process equipment, with the molten point slag of above-mentioned concentrated organic sewage punching 1400 ~ 1600 DEG C, obtain Water Quenching Slag and send into cement burning operation, as cement raw material after harmless treatment.
Embodiment 3
By saliferous and organic coal chemical industrial waste water through sewage purification process process, after producing Treated sewage reusing, and collect residue sewage, be concentrated into 5% of raw wastewater volume, obtain the residue sewage concentrated.
With fine iron breeze 65 ~ 80kg, mixed coal powder 15 ~ 21kg, binding agent 2 ~ 6kg, lime powder 2kg, slaked lime powder 3kg, flyash 5kg for raw material, mix and make iron ore_coal pellet.
Coal ash fusion temperature is selected to be raw material higher than the coal of direct-reduced iron reduction temperature at least 200 DEG C, raw gas is produced in coal-made gas furnace, when the raw gas temperature in coal-made gas furnace reaches 1000 ~ 1150 DEG C, through tornado dust collector dedusting, be transported in direct-reduction shaft furnace by the bustle pipe be located in reduction shaft furnace, the iron ore_coal pellet made loaded in direct-reduced iron shaft furnace through feeding lock hopper simultaneously.The raw gas entering reduction shaft furnace passes from iron ore_coal pellet moving granular bed, and heating iron ore briquet is to produce direct-reduced iron.Direct-reduced iron erects furnace inner gas pressure 6 ~ 40kg, and the direct-reduced iron of generation is discharged by discharge port after lock hopper lower bottom reduction shaft furnace loses heart decompression, is pressed into hot wafering by press.
Added in molten point electric furnace by the direct-reduced iron hot wafering of output with feeder, direct-reduced iron melts in electric furnace, makes slag sluicing system, obtains direct-reduction molten iron for steel-making, and obtains the molten point slag of 1400 ~ 1600 DEG C.
By INBA grain slag production process equipment, with the molten point slag of above-mentioned concentrated residue sewage punching 1400 ~ 1600 DEG C, obtain Water Quenching Slag and send into cement burning operation, as cement raw material after harmless treatment.
Embodiment 4
Coal conversion Coal Chemical Industry, iron and steel, industrial combustion gas ecological Industrial Area are set, dry pulverized coal two stage pressurization vapourizing furnace is included in garden, utilize the direct-reduced iron shaft furnace that high temperature rough gas waste heat is smelted iron, the methyl alcohol product installation of methanol after stock gas purification, methanol purge gas is used for the power generation assembly of combined combustion and steam turbine power, waste heat ironmaking adds the steel-smelting device of steel scrap steel-making, and continuous casting and rolling unit.The waste water that ecological Industrial Area produces comprises strong brine, strong sewage, after purification Treated sewage reusing, strong brine and strong sewage is concentrated into 5% of original volume further, is respectively used to rush the molten point slag of direct-reduced iron and produces Water Quenching Slag.The molten point slag of direct-reduced iron goes out furnace temperature 1400 ~ 1600 DEG C, adopts two cover INBA grain slag production process equipment, punching strong brine Water Quenching Slag and strong sewage Water Quenching Slag respectively.Directly be used as cement raw material after drying with the Water Quenching Slag of strong brine punching, the Water Quenching Slag of strong sewage punching first sends into cement burning operation, is re-used as cement raw material after harmless treatment.
Embodiment 5
After saliferous and the mixing of organic coal chemical industrial waste water, through sewage purification process process, produce Treated sewage reusing, and collect residue sewage, be concentrated into 5% of raw wastewater volume, obtain the residue sewage concentrated.
With fine iron breeze 65 ~ 80kg, mixed coal powder 10 ~ 22kg, lime powder 2kg, slaked lime powder 3kg, flyash 3kg, light dolomite powder 2kg for raw material, fine iron breeze, lime powder, slaked lime powder, flyash, the mixing of light dolomite powder are heated to 350 ~ 600 DEG C, mix with the mixed coal powder being heated to 240 ~ 430 DEG C again, be hot pressed into containing charcoal pelletizing, destructive distillation 3 ~ 6h in gas retort through 800 ~ 1000 DEG C of reducing gas or neutral atmosphere gas again, obtains hot pressing destructive distillation containing charcoal pelletizing.
Coal ash fusion temperature is selected to be raw material higher than the coal of direct-reduced iron reduction temperature at least 200 DEG C, reducing atmosphere raw gas is produced in coal-made gas furnace, when raw gas temperature reaches 1000 ~ 1150 DEG C, through tornado dust collector dedusting, be transported in direct-reduction shaft furnace by the bustle pipe be located in reduction shaft furnace, the hot pressing destructive distillation carbonaceous pelletizing made loaded in direct-reduced iron shaft furnace through feeding lock hopper simultaneously.The raw gas entering reduction shaft furnace passes from hot pressing destructive distillation containing charcoal pelletizing moving granular bed, and heat hot press dry and heats up in a steamer containing charcoal pelletizing to produce direct-reduced iron.Direct-reduced iron erects furnace inner gas pressure 6 ~ 8kg, N bottom reduction shaft furnace
2envelope gaseous tension is greater than direct-reduced iron and erects furnace inner gas pressure, while guaranteeing that in direct-reduced iron shaft furnace, reducing gas does not leak, and direct-reduced iron N bottom reduction shaft furnace of generation
2envelope discharge port, at N
2shaft furnace is discharged under protective atmosphere.
Added in molten point electric furnace by the direct-reduced iron of output with feeder, direct-reduced iron melts in electric furnace, makes slag sluicing system, obtains direct-reduction molten iron for steel-making, and obtains the molten point slag of 1400 ~ 1600 DEG C.
By INBA grain slag production process equipment, with the molten point slag of above-mentioned concentrated residue sewage punching 1400 ~ 1600 DEG C, obtain Water Quenching Slag and send into cement burning operation, as cement raw material after harmless treatment.
Claims (6)
1. melt a point method for slag production Water Quenching Slag with coal chemical industrial waste water process direct-reduced iron, the direct-reduced iron of direct-reduction shaft furnace output is loaded in molten point electric furnace, after fusing, slag iron gravity separation obtains molten point slag, utilize the high temperature sensible heat of molten point slag, use concentrated coal chemical industrial waste water to carry out Water Quenching to a molten point slag, obtain can be used as the Water Quenching Slag of producing cement raw material.
2. coal chemical industrial waste water process direct-reduced iron according to claim 1 melts a point method for slag production Water Quenching Slag, comprising:
A) coal chemical industrial waste water is through sewage purification process process, after the Treated sewage reusing of generation, collects residue sewage and concentrates;
B) in iron ore_coal pellet raw material, allocate the calcic inorganic material accounting for iron ore_coal pellet quality 0.1 ~ 10% into, produce the iron ore_coal pellet being furnished with calcic inorganic material, be seated in direct-reduction shaft furnace, pass into gas maked coal height temperature rough gas, utilize the sensible heat of gas maked coal height temperature rough gas to smelt direct-reduced iron;
C) loaded by the direct-reduced iron of direct-reduction shaft furnace output in molten point electric furnace, slag sluicing system, obtains direct-reduction molten iron for steel-making, and obtains the molten point slag of 1400 ~ 1600 DEG C;
D) with 1400 ~ 1600 DEG C of molten point slags that the above-mentioned concentrated direct punching of residue sewage is come out of the stove, Water Quenching obtains Water Quenching Slag, as cement producting material.
3. coal chemical industrial waste water process direct-reduced iron according to claim 1 melts a point method for slag production Water Quenching Slag, it is characterized in that described calcic inorganic material is the one in lime powder, slaked lime powder, light dolomite powder, ground dolomite, ground silica, glass powder, spoil powder, wilkinite, flyash, or several arbitrary proportion mixtures.
4. coal chemical industrial waste water process direct-reduced iron according to claim 1 melts a point method for slag production Water Quenching Slag, it is characterized in that described coal chemical industrial waste water residue sewage concentration to 5 ~ 10% of coal chemical industrial waste water cumulative volume.
5. coal chemical industrial waste water process direct-reduced iron according to claim 1 melts a point method for slag production Water Quenching Slag, it is characterized in that described coal chemical industrial waste water residue sewage is strong brine and/or the strong sewage containing organic pollutant.
6. coal chemical industrial waste water process direct-reduced iron according to claim 1 melts a point method for slag production Water Quenching Slag, and the strong sewage containing organic pollutant described in it is characterized in that and strong brine are for difference punching Water Quenching Slag.
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| CN113387499A (en) * | 2021-07-02 | 2021-09-14 | 东华大学 | Catalytic degradation method for organic pollutants in printing and dyeing wastewater |
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| CN106521170A (en) * | 2016-12-06 | 2017-03-22 | 江苏省冶金设计院有限公司 | Method and system for treating zinc kiln slag |
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Application publication date: 20150923 |