CN105271624A - Method for synergistically treating heavy metal sludge - Google Patents
Method for synergistically treating heavy metal sludge Download PDFInfo
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- CN105271624A CN105271624A CN201410235279.1A CN201410235279A CN105271624A CN 105271624 A CN105271624 A CN 105271624A CN 201410235279 A CN201410235279 A CN 201410235279A CN 105271624 A CN105271624 A CN 105271624A
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Abstract
The present invention provides a method for synergistically treating heavy metal sludge. The method comprises: uniformly mixing heavy metal sludge with a water content of 20-50% and a calcium-based fluorine fixing agent, drying, crushing to obtain calcium-based sludge, uniformly mixing with a base sintering raw material and dust removing ash, granulating, and distributing the material, wherein a mass ratio of the base sintering raw material to the heavy metal sludge to the calcium-based fluorine fixing agent to the dust removing ash is 50-120:0.3-20:0.1-2:0.5-5; sintering the granulated mixing material to obtain sintered ore, wherein the flue gas produced during the sintering process passes through a dust removing and desulfurization device, and the purified flue gas is externally discharged through a chimney; and conveying the sintered ore into a blast furnace, and smelting, wherein the flue gas is externally discharged after the dust removing, the smelting residue is comprehensively utilized, and the alloy hot metal enters the steelmaking converter of the stainless steel enterprise. According to the present invention, dust, gas and wastewater can be discharged into the existing facilities so as to be treated; and with the synergetic treatment of the sintering process and the blast furnace smelting, most of the metal elements can be effectively recovered so as to achieve harmlessness and resources.
Description
Technical field
The invention belongs to industrial dangerous waste process and field of comprehensive utilization, particularly relate to a kind of method utilizing the existing sinter machine of stainless steel enterprises and blast-furnace smelting flow process cooperative disposal heavy metal sewage sludge.
Background technology
In the industrial production such as smelting, intermetallic composite coating, manufacture, plating, heavy-metal acid waste water source is wide, kind is many, complicated component, and its treatment process can be summarized as chemical method, Physical, physico-chemical processes and biochemical process.Take milk of lime as the chemical neutralization precipitator method of major pharmaceutical agent, because operational path is ripe, cost for wastewater treatment is low, maintenance management is convenient, level of automation high, at home and abroad be widely used, but consequent excess heavy metal sewage sludge, always be environmental protection difficult point and the emphasis of industrial enterprise.Especially in recent years, along with the increasingly stringent day by day improving and monitor Hazardous wastes transfer, treatment and disposal of environmental regulation, the outer committee disposal costs cumulative year after year of heavy metal sewage sludge, brings heavy economical load to enterprise.
Heavy metal sewage sludge so that stainless-steel cold-rolling waste water station produces: analyze and show, heavy metal sewage sludge water ratio 50 ~ 75% after the solid-liquid separation facilities such as filter press, vacuum filtration, diaphragm pressing, the total metal oxide content such as Cr, Ni, Zn, Pb, Fe, Cu, Ag, Cd 2 ~ 15%, calcium sulfate, Calcium Fluoride (Fluorspan), calcium chloride content 10 ~ 30%, other water soluble salts and foreign matter content about 5%.Heavy metal sewage sludge particle is comparatively thin, complicated component, Leaching are high, pollutant load fluctuation is large, is attributed to HW17 and HW21 class Hazardous wastes, and process can cause poisonous metal to the secondary pollution at soil and water source accidentally.
For alleviating or eliminate the harm of heavy metal sewage sludge, recycle valuable resource wherein, avoid the secondary pollution in recycling process, Chinese scholars is with reference to electroplating sludge, the disposal and utilization experience of chromium-bearing sludge, at sludge curing/stabilizing (CN1631940A, CN101863516A, CN101921090A, CN102514079A, CN1030219A etc.), wet underwater welding metal (CN101235439A, CN101618892A, CN101982433A, CN101618896A etc.), size mixing and reclaim chromium Ni ferrite (CN101863516A etc.), microbial acclimation leaches (CN102690956A, CN102719657A, CN101708936A etc.), roasting reduction prepares alloy (CN1733628A, CN1312391A etc.), prepare chromium system product (CN102625777A etc.), be mixed for building materials (CN101830681A, CN102414141A, CN102249730A etc.) or industrial chemicals (CN102491640A etc.), compost agricultural (CN101274861 etc.), for manufacture of cement (CN101475325A, CN102701549A etc.), metallurgical reuse (CN101805827A etc.), safe disposal (CN201560162U, CN102285743A, CN102583920A etc.) etc. aspect done a lot of useful exploration, but it is little to there is volume all to a certain extent, poor for applicability, heavy metal recovery rate is low, technical process is complicated, facility investment or working cost high, utilize process energy consumption high or easily cause secondary pollution problems.
Feature as CN1733628A is the first drying of electroplating sludge, then enters smelting furnace melting after preparing burden with flux, coke and reclaim valuable metal.The main drawback that this technique exists is mud without in-depth processed, but directly carries out drying, and energy consumption is large, and production cost is high.
The feature of CN102417987A is that electroplating sludge first uses acidleach valuable metal, and solid-liquid separation after vulcanization compound sinks copper, and then carries out solid-liquid separation and obtain cupric sulfide and heavy copper mother liquor, and last step-by-step processing reclaims the valuable metal in heavy copper mother liquor.The main drawback of this technique is that technical process is long, solid-liquid separation difficulty, and recovery rate of valuable metals is lower, adopts sulfuration method to sink the operating environment of copper poor, can produce new heavy metal wastewater thereby again in production process under acidic conditions.
The feature of CN1451495A is first by industrial residue, electroplating sludge with add by a certain percentage and regulate between pH to 1.5 ~ 9, then add solidifying agent, stablizer and water and stir evenly rear molding, and be solidified into building block, finally by laying bricks or stones module finished product is built to block curing, air-dry obtaining.This technique main drawback does not recycle valuable metal wherein, do not reach the dual purpose of resource utilization and harmless treatment.
The existing document patent report of comprehensive analysis, find up to now, for having a large capacity and a wide range, the heavy metal sewage sludge that coexists of hazardness and resource, there is no the utilization ways that properly safety is economical and practical again both at home and abroad, more large utilization ways is still bakes bricks or is used as cement spike, but because in heavy metal sewage sludge, the volatile substances such as fluorine, chlorine content is higher, under the high temperature conditions, fluorine, chlorine can with HF, SiF
4, the effusion of the gaseous state thing form such as HCl, not only etching apparatus, cause kilneye ring formation, also can endanger surrounding environment, even can cause the sericulture industry underproduction in the neighbourhood.Meanwhile, when mud volume is more than 2%, need to be assessed further to the environmental safety risk brought in cement or brick and tile use procedure because mixing burning Hazardous wastes.
On the other hand, containing various metals composition (as chromium, nickel, copper, lead, iron, zinc etc.) and Non-metallic components (as Calcium Fluoride (Fluorspan), calcium sulfate, calcium carbonate, calcium chloride etc.) in heavy metal sewage sludge, it itself is again a kind of renewable resources of cheapness.In view of the shortage of China metals resources, how while control secondary pollution, the heavy metals such as the chromium in effective recycling heavy metal sewage sludge, nickel, have caused the extensive concern of people.
Smelt in the production layout of long flow process at stainless steel enterprises, sintering process at reduction molten iron cost, High-quality Sinters be provided, in steel mill waste resource of dissolving, enterprise energy-conserving and environment-protective level etc., play more and more important effect." sintering+blast furnace " combination has become the mainstream configuration of molten iron of high quality and at a reasonable price.
If the existing sinter machine of stainless steel enterprises, blast furnace and auxiliary facility thereof can be utilized, develop a kind of method of disposal of heavy metal sewage sludge, make it to have concurrently and pollute advantages such as thoroughly eliminating, valuable material reclaims, processing cost is cheap, the closed cycle realizing iron and steel enterprise's heavy metal sewage sludge is disposed, and iron and steel enterprise works in coordination with other industry heavy metal sewage sludge of dissolving, expands its social environment-friendly function, all significant.
Summary of the invention
Therefore, little, poor for applicability for existing art breading amount, heavy metal recovery rate is low, technical process is complicated, facility investment or working cost high, utilize that process energy consumption is high, innoxious does not thoroughly easily cause the defects such as secondary pollution, the technical problem to be solved in the present invention is to provide a kind of method polluting thorough elimination, valuable material reclaims, processing cost is cheap disposal heavy metal sewage sludge.
Technical scheme of the present invention is, a kind of method of cooperative disposal heavy metal sewage sludge, comprises drying and the pulverizing of heavy metal sewage sludge,
(1) by water ratio be the heavy metal sewage sludge of 20 ~ 50% and calcium-based absorbents mixes, dry, pulverize, obtain calcium base mud, calcium base mud and basic raw materials for sintering and dedusting ash mixed, granulation, cloth; The mass ratio of described basic raw materials for sintering, heavy metal sewage sludge, calcium-based absorbents, dedusting ash is: 50-120:0.3 ~ 20:0.1 ~ 2:0.5 ~ 5;
(2) batch mixing after granulation is sintered, obtain agglomerate; The flue gas that sintering process produces, after dedusting, desulfurizer, neat stress is arranged outward through chimney;
(3) agglomerate is sent into blast furnace, smelt, outer row after flue gas ash removal, metallurgical slag fully utilizes, and alloy hot metal enters the steel-making converter of stainless steel enterprises.
Described cloth process, the moisture content of compound, granularity, degree of mixedness comply with the requirement of normal sintering batch mixing.
Described sintering process, be the sintering operation of routine, follow-up have dedusting and desulfurizer, and sintered discharge gas is after dedusting and desulfurization, and dedusting ash returns as sintered material, and neat stress is by smoke stack emission.
Described blast furnace ironmaking process, be the stainless steel blast furnace ironmaking process of routine, follow-up have cleaning apparatus; Dedusting ash returns as sintered material, and metallurgical slag fully utilizes, and alloy hot metal is transported to steel-making converter, carries out follow-up refinement treatment.
According to the method for cooperative disposal heavy metal sewage sludge of the present invention, preferably, described heavy metal sewage sludge is one or more of the by product from industry milk of lime-chemical precipitation art breading heavy metal wastewater therebies such as iron and steel, chemical industry, petrochemical industry, plating, nonferrous metallurgy, intermetallic composite coating, machinofacture.Mud, after the mechanical solid-liquid separation facilities such as filter press, diaphragm pressing, vacuum press filtration, can be taked naturally to store up mummification in canopy or in storehouse, be down to 20 ~ 50% to water ratio.
According to heavy metal sewage sludge source and different in kind, when its natural mummification to water ratio is 20 ~ 50%, appearance is comparatively hard, convenient conveying, storage, broken and follow-up mixing.Water ratio is too high, wet sticky shapeless, pulverizes broken sieved journey and has some setbacks, cause adhering device or putty; Water ratio is too low, and the natural mummification cycle is long first, occupation of land is large; Second, when water ratio is too low, when pulverizing broken sieve, dust secondary pollution can be produced.
Preferably, described calcium-based absorbents is a kind of in limestone powder, ground dolomite, unslaked lime.In sewage sludge sintering high-temperature treatment process, have the effect of flux concurrently, guarantee that mud liquid phase melting process carries out smoothly, and control the volatilization of fluoro-gas.In addition, in mud mix, fluorine fixing material also can play the effect absorbing cellular moisture, reduce mud agglomerate water ratio.The concrete adding proportion of fluorine fixing material is determined according to moisture percentage in sewage sludge and composition.
Preferably, after described in step (1), heavy metal sewage sludge and calcium-based absorbents are pulverized, the size range of calcium base mud is more than 0.01 ~ 10mm (99wt%), that is mud of more than 99%, and particle size range is at 0.01 ~ 10mm.Now moisture percentage in sewage sludge is 5 ~ 20%.
According to the method for cooperative disposal heavy metal sewage sludge of the present invention, preferably, described basic raw materials for sintering at least comprise fine ore, solid fuel, containing calcium flux, return mine, steel scale of steel rolling, bof sludge one or more; Described dedusting ash is flue gas ash removal ash.
Further, in described dedusting ash Zn content lower than 1.0%.Further, the dedusting ash that can collect from sintered discharge gas, blast furnace or converter waste gas for cleaning apparatus of this dedusting ash.Also can be environmental dust removal ash.
One or more or described fuel is selected from coke powder, coal dust, in carbon dust; The described calcium flux that contains is selected from ground dolomite, limestone powder, unslaked lime.
According to the method for cooperative disposal heavy metal sewage sludge of the present invention, preferably, the mass ratio of described basic raw materials for sintering, heavy metal sewage sludge, calcium-based absorbents, dedusting ash is: 100:0.3 ~ 10:0.1 ~ 2:0.5 ~ 5.
Heavy metal sewage sludge and calcium-based absorbents are in blending process, water ratio reduces further, sludge character (plasticity-, cohesiveness etc.) improves further, the calcium base mud obtained again with mixing, the cloth process of basic raw materials for sintering, dedusting ash, mixing and the distribution device of existing sinter machine can be made full use of; In sintering zone, heavy metal sewage sludge is heated to more than 1600 DEG C gradually, and keeps 30 ~ 60min, and in the process, metal in sludge element (representing with the Me of divalence) recurs oxyhydroxide thermolysis (Me (OH)
2=MeO+H
2o), Reduction of Oxide (MeO+CO=Me+CO
22MeO+C=2Me+CO
2) and slag making reaction (MeO+SiO
2=MeOSiO
22MeO+SiO
2=2MeOSiO
2meO+Me'O+SiO
2=MeOMe'OSiO
2).During this period, the metals such as most chromium, nickel, iron form agglomerate after high temperature action, and the sintered discharge gas produced is (containing dust, SO
2, NO
x, Dioxins, HF, HCl, SiF
4deng) drain into follow-up dedusting and desulfurizer through main exhauster, utilize existing smoke eliminator, purification is carried out to sintered discharge gas and disposes.
After sintering preliminary treatment, the agglomerate containing heavy metal sewage sludge enters blast furnace, is further processed, and under blast furnace strong reducing property condition, in agglomerate, the inorganics such as calcium, silicon, phosphorus, sulphur of more than 90% enters slag phase, ZnO, PbO, Na
2o, K
2the volatile gaseses such as low melting point such as O and dust enter in high-temperature gas, and after dedusting, low zinc dedusting ash is returned and done sintered material recycle.
For heavy metal element chromium representational in mud, set forth the rule of chromium in sintering, blast furnace ironmaking process in mud further: in sintering process, chromium hydroxide, after thermolysis, redoxomorphism, enters agglomerate; Under the strong reductive condition of blast-furnace smelting, about have the chromium of 90% to enter molten iron, less than 10% in agglomerate and enter slag, a small amount of chromium entering slag can only exist with trivalent, can not cause secondary pollution.The same slag composition of the allocation proportion of concrete chromium in slag, iron, hot metal composition and slag iron temperature are relevant, when chromium too high levels, may also affect the performance of slag; And when the addition of heavy metal sewage sludge in sintered material is less than 10%, can not impact slag.
Because the present invention relies on " sintering+blast furnace " technique and the auxiliary facility of existing stainless steel enterprises maturation, in whole process, dust, gas and discharge of wastewater can include existing utility disposal process in; For harmful element in heavy metal sewage sludge, the cooperative disposal of sintering process and blast-furnace smelting, can make most metallic element obtain efficient recovery, thus realizes its innoxious and resource utilization; And the metallic elements such as Cr, Ni of minute quantity enter in slag, basic impact can not be produced on slag.Therefore, from the angle of dissolve process and safe disposal heavy metal sewage sludge, this is one, and removing toxic substances is the most thorough, cost is most economical, the simplest approach of technique.
(1) technical process of stainless steel associated enterprises is long, existing sinter machine and blast furnace and auxiliary facility configuration is complete, environmental protection facility is complete, sensible heat aboundresources, there is high temperature reducing conditions, can cooperative disposal heavy metal sewage sludge, realizing that hazard component is innoxious, valuable material resource utilization, is that iron and steel enterprise's heavy metal sewage sludge closed cycle is disposed and the Beneficial of social large Hazardous wastes of dissolving.
(2) this technique can utilize stainless steel enterprises existing installation and flow process, without the need to building special treatment plant and smelting device, simple to operate, metal recovery rate is high, investment and working cost low, mud handling capacity is large, be easy to industrialization promotion, can the various heavy metal sewage sludge of in situ remediation, and considerable influence is not produced to stainless steel grain slag performance and later use, be Hazardous wastes resource utilization and innoxious effective ways.
(3) heavy metal sewage sludge and calcium-based absorbents mix, dry, pulverizes after the calcification mud that obtains, not only reduce sludge drying cost, also effectively can improve vertical sintering speed, yield rate and utilization coefficient during agglomerate sintering, the flux add-on in raw materials for sintering can also be reduced simultaneously, reduce raw materials cost, and in sintering process, reduce the volatile quantity of vapor-phase fluoride, achieve many things at one stroke.
(4) under " sintering+blast furnace " hot conditions, metallic element in heavy metal sewage sludge, inorganic component and combustibleconstituents, fully can there is physical-chemical reaction, participate in the synthesis of clinker mineral, and wherein the unwanted component such as foreign metal and fluorine element also can be solid-solution in clinker mineral structure and high-temperature liquid-phase, realize stable solidification.
(5) metallic element such as chromium, nickel, iron enters in stainless steel molten iron, it is the useful supplement to molten iron alloy mass, therefore this technique suitability is strong, except processing stainless-steel cold-rolling mud, the cold rolling mud of carbon steel, the cold rolling mud of special steel, electroplating sludge, nonferrous metallurgy mud, wiring board mud etc. containing heavy metal waste, also can to dissolve general industry refuse simultaneously, to make it be converted into recycling and be worth the stainless steel slag comparatively large, the scope of application is wider.
Accompanying drawing explanation
Fig. 1 is technical process of the present invention.
Embodiment
Embodiment 1
Heavy metal sewage sludge comes from certain stainless steel enterprises cold rolling wastewater treatment station, for the by product (being called for short cold rolling mud) of milk of lime-chemical precipitation art breading cold rolling wastewater, cold rolling mud is after filter press, heap is stored in substrate antiseepage, in draughty warehouse, this mud Exemplary chemical component is: Cr (3.0%), Ni (0.7%), Zn (0.02%), Pb (0.03%), Fe (22.4%), Si (3.1%), K (0.03%), Na (0.01%), total carbon (2.0%), scaling loss (15%), CaSO4 (22%), CaF2 (18%), CaCl2 (2%), heavy metal sewage sludge particle is thinner, complicated component, Leaching is high, be attributed to Hazardous wastes (National Hazard refuse register HW17 and HW21), according to environmental requirement, outer committee is needed to have the enterprise of qualification properly to dispose.
As shown in Figure 1, when the mummification of 1000 tons of cold rolling mud natures is to water ratio 50%, mix with 100 tons of unslaked limes (calcium-based absorbents), dry, pulverize, obtaining water ratio is 20%, size range is the calcium base mud of 0.01 ~ 5mm, in the commerical test of month by a definite date, calcium base mud and 10000 tons of basic raw materials for sintering are (by 80 parts of fine ores, 5 parts of coke powders, 8 parts of ground dolomites and 7 parts of compositions of returning mine, wherein fine ore adds this powder by 13 parts of OK a karaoke clubs respectively, 22 parts of CVRD powder, 3.5 parts of PB powder, 8.5 parts of oblique three ore deposits, 3 parts of assorted ore deposits, 14 parts of Mike's powder, spread out ore deposit, river for 5 parts, 31 parts of Yang Di powder compositions), 500 tons of dedusting ash (are made up of by a certain percentage the low zinc dedusting ash from sintered discharge gas cleaning apparatus and blast furnace waste gas cleaning apparatus, Zn content is lower than 1.0%) mixing after, carry out cloth and stoking, agglomerate, after fragmentation, screening, enters blast furnace as iron-smelting raw material and smelts, the waste gas sintering and produce in iron manufacturing process, respectively after dust-removal and desulfurizing and dedusting, neat stress is arranged outward, and dedusting ash returns the raw material making sintered material, agglomerate is through blast furnace high temperature reduction, and the alloy hot metal of generation enters the steel-making converter of stainless steel enterprises, refines further, stainless steel slag fully utilizes.
In sintering commerical test, after adding calcium base mud, in basic raw materials for sintering, lime adding amount decreases 1.2%, sintering finished rate increases 3.0%, and sintering utilization coefficient increases 10%, and solid burnup reduces 0.6kg/T, sintering performance significantly improves, and sintering cost significantly reduces.
Carry out in process in commerical test, to flue gas after sintering device handpiece flue gas, dust-removal and desulfurizing, BF Gas Washing water, blast furnace slag quenching water, carry out tracking monitor, to find in flue gas that the compositions such as SO2, NOX, fluorochemical, HCl, sulfuric acid mist are all in normal range, lower than " steel sintering, pelletizing industrial air pollution thing emission standard " (GB28662-2012) emission limit set, discharge of wastewater index meets " Iron And Steel Industry pollution discharge standard " (GB13456-2012).
Detect stainless steel slag composition, the Leaching of its main metal element (as chromium, lead, nickel, copper, zinc, cadmium, arsenic, silver etc.) is all lower than GB (GB5085.3-2007), this stainless steel slag illustrating that this technique produces can follow original building materials Land use models, as road administration material, concrete and cement products raw material.
Contrast blank group, based on heavy metal sewage sludge treatment capacity and composition (with Fe, Cr, Ni) and stainless steel slag generation and composition, the rate of recovery of Theoretical Calculation three kinds of major metals is respectively 92%, 95% and 93%.
Embodiment 2
When the mummification of 1000 tons of stainless-steel cold-rolling mud natures is to water ratio 45%, mix with 200 tons of ground dolomites (calcium-based absorbents), dry, pulverize, obtaining water ratio is 15%, size range is the calcium base mud of 1 ~ 5mm, in the commerical test of month by a definite date, calcium base mud and 15000 tons of basic raw materials for sintering are (by 85 parts of fine ores, 5 parts of coal dusts, 5 parts of ground dolomites and 5 parts of compositions of returning mine, wherein fine ore adds this powder by 15 parts of OK a karaoke clubs respectively, 20 parts of CVRD powder, 5 parts of PB powder, 10 parts of oblique three ore deposits, 3 parts of assorted ore deposits, 17 parts of Mike's powder, spread out fried rice noodles for 9 parts, 31 parts of Yang Di powder compositions), 400 tons of dedusting ash are (by from sintered discharge gas cleaning apparatus, the low zinc dedusting ash of blast furnace waste gas cleaning apparatus and converter dust-removing device forms by a certain percentage, Zn content is lower than 1.0%) mixing after, carry out cloth and stoking, other processes are with embodiment 1.
In sintering commerical test, after adding calcium base mud, in basic raw materials for sintering, lime adding amount decreases 1.5%, sintering finished rate increases 2.5%, and sintering utilization coefficient increases 8%, and solid burnup reduces 0.9kg/T, sintering performance significantly improves, and sintering cost significantly reduces.
In commerical test process, waste water, exhaust gas emission all meet GB, slag quality meets requirements of comprehensive utilization, contrast blank group, based on heavy metal sewage sludge treatment capacity and composition (with Fe, Cr, Ni) and slag generation and composition, the rate of recovery of Theoretical Calculation three kinds of major metals is respectively 90%, 92% and 95%.
Other are with embodiment 1.
Embodiment 3
When the mummification of 1000 tons of stainless-steel cold-rolling mud natures is to water ratio 35%, mix with 250 tons of ground dolomites (calcium-based absorbents), dry, pulverize, obtaining water ratio is 18%, size range is the calcium base mud of 0.5 ~ 5mm, in the commerical test of month by a definite date, calcium base mud and 18000 tons of basic raw materials for sintering are (by 82 parts of fine ores, 8 parts of coal dusts, 7 parts of ground dolomites and 3 parts of compositions of returning mine, wherein fine ore adds this powder by 10 parts of OK a karaoke clubs respectively, 25 parts of CVRD powder, 15 parts of PB powder, 5 parts of oblique three ore deposits, 5 parts of assorted ore deposits, 10 parts of Mike's powder, spread out fried rice noodles for 10 parts, 20 parts of Yang Di powder compositions), 350 tons of dedusting ash are (by from sintered discharge gas cleaning apparatus, the low zinc dedusting ash of blast furnace waste gas cleaning apparatus and converter dust-removing device forms by a certain percentage, Zn content is lower than 1.0%) mixing after, carry out cloth and stoking, other processes are with embodiment 1.
In sintering commerical test, after adding calcium base mud, in basic raw materials for sintering, lime adding amount decreases 2.5%, sintering finished rate increases 1.2%, and sintering utilization coefficient increases 7%, and solid burnup reduces 0.7kg/T, sintering performance significantly improves, and sintering cost significantly reduces.
In commerical test process, waste water, exhaust gas emission all meet GB, slag quality meets requirements of comprehensive utilization, contrast blank group, based on heavy metal sewage sludge treatment capacity and composition (with Fe, Cr, Ni) and slag generation and composition, the rate of recovery of Theoretical Calculation three kinds of major metals is respectively 91%, 93% and 96%.
From above embodiment, utilize the existing sinter machine of stainless steel enterprises and blast-furnace smelting flow process cooperative disposal heavy metal sewage sludge, can economical, realize dissolving and disposing of mud effectively, safely, to environment, alloy hot metal and stainless steel slag without negative impact, therefore, this technique is the Beneficial of iron and steel enterprise's heavy metal sewage sludge closed cycle disposal and social large Hazardous wastes of dissolving.
Claims (9)
1. a method for cooperative disposal heavy metal sewage sludge, comprises drying and the pulverizing of heavy metal sewage sludge, it is characterized in that:
(1) by water ratio be the heavy metal sewage sludge of 20 ~ 50% and calcium-based absorbents mixes, dry, pulverize, obtain calcium base mud, calcium base mud and basic raw materials for sintering and dedusting ash mixed, granulation, cloth; The mass ratio of described basic raw materials for sintering, heavy metal sewage sludge, calcium-based absorbents, dedusting ash is: 50-120:0.3 ~ 20:0.1 ~ 2:0.5 ~ 5;
(2) batch mixing after granulation is sintered, obtain agglomerate; The flue gas that sintering process produces, after dedusting, desulfurizer, neat stress is arranged outward through chimney;
(3) agglomerate is sent into blast furnace, smelt, outer row after flue gas ash removal, metallurgical slag fully utilizes, and alloy hot metal enters the steel-making converter of stainless steel enterprises.
2. the method for cooperative disposal heavy metal sewage sludge according to claim 1, it is characterized in that, described heavy metal sewage sludge is one or more of the by product from industry milk of lime-chemical precipitation art breading heavy metal wastewater therebies such as iron and steel, chemical industry, petrochemical industry, plating, nonferrous metallurgy, intermetallic composite coating, machinofacture.
3. the method for cooperative disposal heavy metal sewage sludge according to claim 1, is characterized in that, described calcium-based absorbents is a kind of in limestone powder, ground dolomite, unslaked lime.
4. the method for cooperative disposal heavy metal sewage sludge according to claim 1, is characterized in that, after described in step (1), heavy metal sewage sludge and calcium-based absorbents are pulverized, the size range of more than 99wt% calcium base mud is 0.01 ~ 10mm.
5. the method for cooperative disposal heavy metal sewage sludge according to claim 1, is characterized in that, described basic raw materials for sintering at least comprise fine ore, solid fuel, containing calcium flux, return mine, steel scale of steel rolling, bof sludge one or more; Described dedusting ash is flue gas ash removal ash.
6. the method for cooperative disposal heavy metal sewage sludge according to claim 5, is characterized in that, in described dedusting ash, Zn content is lower than 1.0%.
7. the method for the cooperative disposal heavy metal sewage sludge according to claim 5 or 6, is characterized in that, described dedusting ash is the dedusting ash that cleaning apparatus is collected from sintered discharge gas, blast furnace or converter waste gas.
8. the method for cooperative disposal heavy metal sewage sludge according to claim 5, is characterized in that, described fuel is selected from coke powder, coal dust, one or more in carbon dust; The described calcium flux that contains is selected from ground dolomite, limestone powder, unslaked lime.
9. the method for cooperative disposal heavy metal sewage sludge according to claim 1, is characterized in that, the mass ratio of described basic raw materials for sintering, heavy metal sewage sludge, calcium-based absorbents, dedusting ash is: 100:0.3 ~ 10:0.1 ~ 2:0.5 ~ 5.
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| CN112280973A (en) * | 2020-11-02 | 2021-01-29 | 宝钢湛江钢铁有限公司 | Method for co-processing emulsified oil sludge by sintering system |
| CN113881822A (en) * | 2021-08-23 | 2022-01-04 | 浙江省工业设计研究院有限公司 | Novel process method for blast furnace co-processing hazardous waste hw17 |
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| CN105907950A (en) * | 2016-04-29 | 2016-08-31 | 浙江大学 | Treatment method for metallurgy sintering of abandoned SCR flue gas denitrification catalyst |
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| CN113881822A (en) * | 2021-08-23 | 2022-01-04 | 浙江省工业设计研究院有限公司 | Novel process method for blast furnace co-processing hazardous waste hw17 |
| CN114074104A (en) * | 2021-11-04 | 2022-02-22 | 浙江工商大学 | Method for co-processing chromium-containing hazardous waste and zinc-containing waste residue |
| CN114317954A (en) * | 2021-12-31 | 2022-04-12 | 上海大学 | Method for cooperatively treating and utilizing stainless steel pickling sludge and blast furnace dust |
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