CN106478034A - A kind of method preparing autoclaved lime-sand brick using Pb-Zn tailings curing heavy metal - Google Patents

A kind of method preparing autoclaved lime-sand brick using Pb-Zn tailings curing heavy metal Download PDF

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Publication number
CN106478034A
CN106478034A CN201610906673.2A CN201610906673A CN106478034A CN 106478034 A CN106478034 A CN 106478034A CN 201610906673 A CN201610906673 A CN 201610906673A CN 106478034 A CN106478034 A CN 106478034A
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China
Prior art keywords
tailings
grade
stone fragment
water
carbide slag
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Pending
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CN201610906673.2A
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Chinese (zh)
Inventor
王长龙
常永智
田小平
吴平川
栗东平
陈烈
杨建�
刘世昌
钱伟
刘振宇
靳倡智
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Tianjin Shunneng Sega Environmental Technology Co Ltd
Hebei University of Engineering
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Tianjin Shunneng Sega Environmental Technology Co Ltd
Hebei University of Engineering
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Priority to CN201610906673.2A priority Critical patent/CN106478034A/en
Publication of CN106478034A publication Critical patent/CN106478034A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/10—Lime cements or magnesium oxide cements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/02—Conditioning the material prior to shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/12—Waste materials; Refuse from quarries, mining or the like
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • C04B18/144—Slags from the production of specific metals other than iron or of specific alloys, e.g. ferrochrome slags
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/16—Waste materials; Refuse from building or ceramic industry
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mining & Mineral Resources (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The present invention provides a kind of method preparing autoclaved lime-sand brick using Pb-Zn tailings curing heavy metal, including：(1) Pb-Zn tailings, stone fragment, waste aerocrete, the powder of carbide slag and water are fully mixed by a certain percentage；(2), after the material standing 2h after mixing, carry out the secondary stirring that adds water；(3) compound is pressed into the adobe of 240mm × 115mm × 53mm；(4) and then by the adobe suppressing stand stacking, be then fed in still kettle carrying out steam pressure, autoclaved condition is：Intensification 2h, constant temperature 4～8h, pressure 1.0～1.3MPa, temperature is 170～190 DEG C, and lower the temperature 2h；Kettle is gone out after cooling.Autoclaved lime-sand brick raw materials for production are all industrial residue, simple and easy to get, low production cost, simple production process, product extensive market, open new approach to the recycling of the solid waste such as the Pb-Zn tailings, stone fragment, waste aerocrete and the carbide slag that are difficult by, advantageously account for solid waste store up in a large number cause occupy cultivated land, environmental pollution and the problems such as social safety.

Description

A kind of method preparing autoclaved lime-sand brick using Pb-Zn tailings curing heavy metal
Technical field
The application belongs to comprehensive utilization of resources field and building material field, specifically, is related to one kind and utilizes lead zinc tail The method that ore deposit curing heavy metal prepares autoclaved lime-sand brick.
Background technology
At present, China's non-ferrous metal lead zinc, during selecting and purchasing, produces the Mine Solid Wastes lead zinc tail of substantial amounts Ore deposit.Quickly growing with nonferrous metal property, the exploitation popularization of Pb-Zn deposits and the prolongation of mining history, lead zinc The accumulating amount of mine tailing is also in increase year by year, and the comprehensive utilization to Pb-Zn tailings is less, and how substantial amounts of Pb-Zn tailings are with nature Method of piling is stored in Tailings Dam.These store up solid waste bring environmental pollution, occupy cultivated land, mining area safety etc. A series of problem, is unfavorable for the coordinated development of mine environment and recycling economy.
Stone fragment is the waste material that stone material or stone pit carry out generation in raw material processing, contains bulky grain, also contain in bits Powder, surface is more coarse than sand, has sharp corners, and is less than the stone powder of 0.16mm containing more particle diameter.
Aero-crete factory aborning, often has machining chips and waste product to produce, simultaneously using aerated concrete products Construction site also often have broken aerated concrete products to discard as building waste, most discarded plus Gas concrete is not reasonably utilized, and leads to the degree that some aero-crete factories have nowhere stacked, and affects air entrained concrete The production and operation of factory.
Carbide slag is carbide (CaC2) it is dissolved in hydrolysis generation acetylene (C2H2) industrial by-products that produce afterwards, China disappears every year Carbide about 3,000,000 t of consumption, the solid waste carbide slag (dry slag) simultaneously producing every year measures nearly 5,000,000 t.The granule of carbide slag Superfine, 10～50 μm of granules account for 60～80%, and in alkalescence, its main component is Ca (OH)2, the content of CaO in chemical composition Account for more than 70%, additionally contain a small amount of Organic substance (SiO2、MgO、FeO、Fe2O3、Al2O3、P2O5Deng) and inorganic impurity, so Carbide slag has micro- stink, and because it produces, quantity is big, and cost of transportation is high, and a lot of enterprises are especially in limestone reserves than larger Area, is processed frequently with the mode stored up on the spot, so not only wastes substantial amounts of land resource but also makes to surrounding enviroment Become secondary pollution.
China attaches great importance to the protection to land resource, base as the country typically having a large population and a few land, all the time country In this situation, land occupation resource stacked by trade waste becomes critical problem urgently to be resolved hurrily.Simultaneous environment The pressure of protection and the banning the production of fired brick, need no-firing brick product to replace.With industrial solid castoff preparation Autoclaved lime-sand brick is one of very typical no-firing brick.Produce autoclaved lime-sand brick using industrial solid castoff, both eliminated Solid waste stacks land occupation resource and the environmental problem causing, and the replacement that again can become vitrified bond solid brick is produced Product, be also simultaneously realize turning waste into wealth, one of the effective way of the utilization of three wastes.The enterprise in Some Domestic area has carried out at present Produce research and the application of autoclaved lime-sand brick using solid waste.
Patent of invention《A kind of method that Pb-Zn tailings prepare silicate brick》(publication number CN103058618A, publication date 2013.04.24) disclose one kind and make aggregate using Pb-Zn tailings, be subsequently adding quartz sand, fluvial sand and quick lime and prepare silicate The method of steam-pressing brisk.It is characterized in make use of the spy of Pb-Zn tailings easy-formation in steam-pressing brisk pressing process of higher true density Point.But the shortcoming of this patent is that the utilization rate of industrial residue is too low, and employs the raw materials such as quartz sand, fluvial sand, increased life Produce cost.
Patent of invention《A kind of autoclaved Brick from high content construction garbage and its production method》(publication number CN101306929A, public Open a day 2008.11.19) to disclose a kind of be raw material production MU10 using discarded brick powder, discarded concrete, carbide slag and pulverized limestone Steam-pressing brisk method.Its production technology is：First discarded brick powder and the concrete of suitable particle size will be prepared, then with carbide slag or Pulverized limestone adds water mix and blend, compressing after carry out steam pressure.It is characterized in that industrial residue is mainly former as production steam-pressing brisk Material, can play the effect of reducing energy consumption and waste gas discharge.But its shortcoming is the steam-pressing brisk low intensity producing first, only reaches MU10 standard, the scope of application is little；Secondly the cost of steam-pressing brisk is partly increased in the steam-pressing brisk producing using pulverized limestone.
Content of the invention
It is an object of the invention to overcome its Pb-Zn tailings to manufacture the potential low intensity that steam-pressing brisk brings, density big and The problem of frost resistance difference, provides a kind of method preparing autoclaved lime-sand brick using Pb-Zn tailings curing heavy metal, its be a kind of with Pb-Zn tailings, stone fragment, waste aerocrete and carbide slag be raw material, can 100% utilize solid waste prepare steam pressure The technology of preparing of Dinas brickes, makes full use of solid waste, so that large entirety of solid waste is dissolved using being possibly realized.
A kind of method preparing autoclaved lime-sand brick using Pb-Zn tailings curing heavy metal, comprises the following steps：
(1) powder of Pb-Zn tailings, stone fragment, waste aerocrete, carbide slag is mixed by a certain percentage with water and stirs Mix 10min, so that material is fully mixed；
(2), after the material standing 2h after mixing, carry out the secondary stirring that adds water, the secondary stirring time is 5min；
(3) compound is pressed into the adobe of 240mm × 115mm × 53mm, briquetting pressure is 20～30KN；
(4) and then by the adobe suppressing stand stacking, be then fed in still kettle carrying out steam pressure, autoclaved condition is：Rise Warm 2h, constant temperature 4～8h, pressure 1.0～1.3MPa, temperature is 170～190 DEG C, and lower the temperature 2h；Kettle is gone out after cooling.
Further, method as above, in step (1), the addition of water is the 6～11% of siccative gross mass.
Further, method as above, in step (2), secondary amount of water accounts for the 2% of siccative gross mass.
Further, method as above, in step (1), the grade of described Pb-Zn tailings is -0.074mm ＜ 10%, + 0.16mm ＞ 33% ,+1.25mm ＜ 5%, and make its clay content ＜ 5%.
Further, method as above, in step (1), the grade of described stone fragment is less than 0.01～10mm.
Further, method as above, in step (1), described waste aerocrete grade is less than 1mm.
Further, method as above, the grade of described carbide slag accounts for 80% for -0.074mm content, and it is aqueous Amount is less than 1%.
Further, method as above, the Pb-Zn tailings of use, wherein chemical analysis are by percentage to the quality： SiO245%～65%；Al2O31%～12%；Fe2O3+ FeO 3%～17%；P2O50.01%～4%；MgO 0.1%～ 8%；CaO 15%～30%；K2O 0.1%～1%；Na2O 0.1%～1%；TiO20.01～0.3%；MnO 0.01～ 0.7%；Loss on ignition 0.1%～4%, other 0.01%～2%.
Further, method as above, the stone fragment of use, wherein chemical analysis are by percentage to the quality： SiO240%～80%；Al2O30.1%～15%；Fe2O3+ FeO 0.1%～10%；SO20.1%～10%；MgO 0.1%～10%；CaO 5%～20%；Other 5%～15%.
Further, method as above, the stone fragment of use, wherein chemical analysis are by percentage to the quality： SiO21%～5%；Al2O30.1%～5%；Fe2O3+ FeO 0.01%～5%；CaO 40%～80%；K2O 0.1%～ 1%；Na2O 0.1%～1%；Loss on ignition 20%～30%；Other 0.1%～3%.
Beneficial effect：
Autoclaved lime-sand brick raw materials for production are all industrial residue, simple and easy to get, low production cost, simple production process, product Extensive market, to the resource of the solid waste such as the Pb-Zn tailings being difficult by, stone fragment, waste aerocrete and carbide slag Change using opening new approach, advantageously account for solid waste store up in a large number cause occupy cultivated land, environmental pollution and society Can security problems.
Brief description
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, this Shen Schematic description and description please is used for explaining the application, does not constitute the improper restriction to the application.In the accompanying drawings：
Fig. 1 prepares the method flow diagram of autoclaved lime-sand brick for the present invention using Pb-Zn tailings curing heavy metal.
Specific embodiment
To describe presently filed embodiment in detail below in conjunction with drawings and Examples, thereby how the application to be applied Technological means are solving technical problem and to reach realizing process and fully understanding and implement according to this of technology effect.
The present invention provides a kind of method preparing autoclaved lime-sand brick using Pb-Zn tailings curing heavy metal.Used herein The essential mineral of Pb-Zn tailings have hedenbergite, johannsenite, allochite, calcite and quartz, belong to skarn type lead zinc Mine tailing.Add trade waste stone fragment, waste aerocrete, carbide slag in order to reduce production cost.Using Pb-Zn tailings And active SiO in stone fragment2And Al2O3With the Ca (OH) in carbide slag2Issue raw hydration reaction in hydro-thermal alkalescence condition, generate Hydrated product C-S-H gel, water stone garnet and tobermorite, Pb2+And Zn2+Enter hydrated product replacement Ca Deng divalent ion2+ Or Mg2+, serve good solidification.Meanwhile, hydrated product and have neither part nor lot in reactionlessness granule, stone fragment aggregate and discarded Air entrained concrete is well combined, and the autoclaved lime-sand brick intensity of preparation and physical property meet Production requirement, is that Pb-Zn tailings etc. are many The comprehensive utilization planting garbage provides a new direction.Autoclaved lime-sand brick raw materials for production are all industrial residue, simple and easy to get, Low production cost, simple production process, product extensive market, to the Pb-Zn tailings being difficult by, stone fragment, discarded aerating coagulation The recycling of the solid waste such as soil and carbide slag opens new approach, advantageously accounts for solid waste and stores up in a large number Cause occupy cultivated land, environmental pollution and the problems such as social safety.
The present invention comprises the following steps that：
1. the Pb-Zn tailings of original grade are carried out by hydraulic classiciation using hydrocyclone, fine fraction product of skimming, obtain Coarse fraction product as brick-making raw material, the Pb-Zn tailings grade obtaining is -0.074mm ＜ 10% ,+0.16mm ＞ 33% ,+ 1.25mm ＜ 5%, and make its clay content ＜ 5%.
2. stone fragment is carried out pre-screening, the stone fragment less than 0.01～10mm grade obtaining is transported to feed bin, is more than The stone fragment of 10mm grade is broken in jaw crusher to be most less than 10mm.
3. waste aerocrete is put into jaw crusher, the product after crushing is sieved, and it is defeated that grade is less than 1mm Deliver to feed bin, the granule return jaw crusher that grade is more than 1mm continues to crush.
4. first carbide slag is dried and be less than 1% to water content, then the carbide slag after drying is put into powder in ball mill It is milled to -0.074mm content and account for 80%.
5. by after the material metering in step 1,2,3,4, add the water accounting for siccative gross mass 6～11%, be placed in strength and stir Mix stirring 10min in machine, so that material is fully mixed；After material after mixing stands 2h in slaking silos, carry out secondary adding water and stir Mix, secondary amount of water accounts for the 2% of siccative total amount, the secondary stirring time is 5min；By compound be pressed into 240mm × 115mm × The adobe of 53mm, briquetting pressure is 20～30KN.Then the adobe suppressing is stood stacking, be then fed into carrying out in still kettle Steam pressure, autoclaved condition is：Intensification 2h, constant temperature 4～8h (maximum pressure 1.0～1.3MPa, temperature is 170～190 DEG C), cooling 2h；Kettle is gone out after cooling.
Embodiment 1：
1. the Pb-Zn tailings of original grade are carried out hydraulic classiciation using hydrocyclone, fine fraction product of skimming, obtain Coarse fraction product as brick-making raw material, the Pb-Zn tailings grade obtaining is -0.074mm ＜ 10% ,+0.16mm ＞ 33% ,+ 1.25mm ＜ 5%, and make its clay content ＜ 5%.Stone fragment is carried out pre-screening, obtain is broken less than 0.01～7mm grade Aggregate chips is transported to feed bin, crushes more than the stone fragment of 7mm grade and be most less than 7mm in jaw crusher.Discarded aerating is mixed Solidifying soil puts into jaw crusher, and the product after crushing is sieved, and grade is transported to feed bin less than 0.8mm, and grade is more than The granule of 0.8mm returns jaw crusher to be continued to crush.Carbide slag after drying is put in grinding extremely -0.074mm in ball mill Content accounts for 80%.
2. the Pb-Zn tailings, stone fragment, discarded concrete and the carbide slag that prepare step 1 are according to siccative mass percent lead After zinc mine tailing 55%, stone fragment 20%, discarded concrete 5%, carbide slag 20% mix homogeneously, add siccative gross weight 8% Water is sufficiently stirred for, and mixing time is 10min.Carry out the secondary stirring that adds water, secondary amount of water is siccative gross weight after standing 2h The 2% of amount, mixing time is 5min.
3. the compound stirring obtaining in step 2 is pressed, pressing pressure is 20KN.To suppress Maintenance in still kettle is put in the adobe of molding.Autoclaved condition is：(maximum pressure 1.25MPa, temperature is 185 for intensification 2h, constant temperature 6h DEG C), lower the temperature 2h.Kettle is gone out after cooling.
Performance indications by the steam-pressing brisk of above-mentioned steps preparation are as shown in table 1.
The steam-pressing brisk performance indications of table 1 embodiment 1 preparation
Embodiment 2：
1. the Pb-Zn tailings of original grade are carried out hydraulic classiciation using hydrocyclone, fine fraction product of skimming, obtain Coarse fraction product as brick-making raw material, the Pb-Zn tailings grade obtaining is -0.074mm ＜ 10% ,+0.16mm ＞ 33% ,+ 1.25mm ＜ 5%, and make its clay content ＜ 5%.Stone fragment is carried out pre-screening, obtain is broken less than 0.01～9mm grade Aggregate chips is transported to feed bin, crushes more than the stone fragment of 9mm grade and be most less than 9mm in jaw crusher.Discarded aerating is mixed Solidifying soil puts into jaw crusher, and the product after crushing is sieved, and grade is transported to feed bin less than 0.5mm, and grade is more than The granule of 0.5mm returns jaw crusher to be continued to crush.Carbide slag after drying is put in grinding extremely -0.074mm in ball mill Content accounts for 80%.
2. the Pb-Zn tailings, stone fragment, discarded concrete and the carbide slag that prepare step 1 are according to siccative mass percent lead After zinc mine tailing 50%, stone fragment 25%, discarded concrete 7%, carbide slag 18% mix homogeneously, add siccative gross weight 10% Water is sufficiently stirred for, and mixing time is 10min.Carry out the secondary stirring that adds water, secondary amount of water is siccative gross weight after standing 2h The 2% of amount, mixing time is 5min.
3. the compound stirring obtaining in step 2 is pressed, pressing pressure is 25KN.To suppress Maintenance in still kettle is put in the adobe of molding.Autoclaved condition is：(maximum pressure 1.3MPa, temperature is 180 for intensification 2h, constant temperature 7h DEG C), lower the temperature 2h.Kettle is gone out after cooling.
Performance indications by the autoclaved lime-sand brick of above-mentioned steps preparation are as shown in table 2.
The steam-pressing brisk performance indications of table 2 embodiment 2 preparation
Embodiment 3：
1. the Pb-Zn tailings of original grade are carried out hydraulic classiciation using hydrocyclone, fine fraction product of skimming, obtain Coarse fraction product as brick-making raw material, the Pb-Zn tailings grade obtaining is -0.074mm ＜ 10% ,+0.16mm ＞ 33% ,+ 1.25mm ＜ 5%, and make its clay content ＜ 5%.Stone fragment is carried out pre-screening, obtain is broken less than 0.01～5mm grade Aggregate chips is transported to feed bin, crushes more than the stone fragment of 5mm grade and be most less than 5mm in jaw crusher.Discarded aerating is mixed Solidifying soil puts into jaw crusher, and the product after crushing is sieved, and grade is transported to feed bin less than 1mm, and grade is more than 1mm's Granule returns jaw crusher to be continued to crush.Carbide slag after drying is put in grinding to -0.074mm content in ball mill account for 80%.
2. the Pb-Zn tailings, stone fragment, discarded concrete and the carbide slag that prepare step 1 are according to siccative mass percent lead After zinc mine tailing 62%, stone fragment 19%, discarded concrete 4%, carbide slag 15% mix homogeneously, add siccative gross weight 7% Water is sufficiently stirred for, and mixing time is 10min.Carry out the secondary stirring that adds water, secondary amount of water is siccative gross weight after standing 2h The 2% of amount, mixing time is 5min.
3. the compound stirring obtaining in step 2 is pressed, pressing pressure is 30KN.To suppress Maintenance in still kettle is put in the adobe of molding.Autoclaved condition is：(maximum pressure 1.2MPa, temperature is 190 for intensification 2h, constant temperature 8h DEG C), lower the temperature 2h.Kettle is gone out after cooling.
Performance indications by the autoclaved lime-sand brick of above-mentioned steps preparation are as shown in table 3.
The steam-pressing brisk performance indications of table 3 embodiment 3 preparation
Embodiment 4：
1. the Pb-Zn tailings of original grade are carried out hydraulic classiciation using hydrocyclone, fine fraction product of skimming, obtain Coarse fraction product as brick-making raw material, the Pb-Zn tailings grade obtaining is -0.074mm ＜ 10% ,+0.16mm ＞ 33% ,+ 1.25mm ＜ 5%, and make its clay content ＜ 5%.Stone fragment is carried out pre-screening, obtain is broken less than 0.01～10mm grade Aggregate chips is transported to feed bin, crushes more than the stone fragment of 10mm grade and be most less than 10mm in jaw crusher.By discarded aerating Jaw crusher put into by concrete, and the product after crushing is sieved, and grade is transported to feed bin less than 0.6mm, and grade is more than The granule of 0.6mm returns jaw crusher to be continued to crush.Carbide slag after drying is put in grinding extremely -0.074mm in ball mill Content accounts for 80%.
2. the Pb-Zn tailings, stone fragment, discarded concrete and the carbide slag that prepare step 1 are according to siccative mass percent lead After zinc mine tailing 44%, stone fragment 20%, discarded concrete 6%, carbide slag 30% mix homogeneously, add siccative gross weight 10% Water is sufficiently stirred for, and mixing time is 10min.Carry out the secondary stirring that adds water, secondary amount of water is siccative gross weight after standing 2h The 2% of amount, mixing time is 5min.
3. the compound stirring obtaining in step 2 is pressed, pressing pressure is 20KN.To suppress Maintenance in still kettle is put in the adobe of molding.Autoclaved condition is：(maximum pressure 1.25MPa, temperature is 185 for intensification 2h, constant temperature 5h DEG C), lower the temperature 2h.Kettle is gone out after cooling.
Performance indications by the autoclaved lime-sand brick of above-mentioned steps preparation are as shown in table 4.
The steam-pressing brisk performance indications of table 4 embodiment 4 preparation
Embodiment 5：
1. the Pb-Zn tailings of original grade are carried out hydraulic classiciation using hydrocyclone, fine fraction product of skimming, obtain Coarse fraction product as brick-making raw material, the Pb-Zn tailings grade obtaining is -0.074mm ＜ 10% ,+0.16mm ＞ 33% ,+ 1.25mm ＜ 5%, and make its clay content ＜ 5%.Stone fragment is carried out pre-screening, obtain is broken less than 0.01～6mm grade Aggregate chips is transported to feed bin, crushes more than the stone fragment of 6mm grade and be most less than 6mm in jaw crusher.Discarded aerating is mixed Solidifying soil puts into jaw crusher, and the product after crushing is sieved, and grade is transported to feed bin less than 0.5mm, and grade is more than The granule of 0.5mm returns jaw crusher to be continued to crush.Carbide slag after drying is put in grinding extremely -0.074mm in ball mill Content accounts for 80%.
2. the Pb-Zn tailings, stone fragment, discarded concrete and the carbide slag that prepare step 1 are according to siccative mass percent lead After zinc mine tailing 65%, stone fragment 15%, discarded concrete 3%, carbide slag 17% mix homogeneously, add siccative gross weight 9% Water is sufficiently stirred for, and mixing time is 10min.Carry out the secondary stirring that adds water, secondary amount of water is siccative gross weight after standing 2h The 2% of amount, mixing time is 5min.
3. the compound stirring obtaining in step 2 is pressed, pressing pressure is 23KN.To suppress Maintenance in still kettle is put in the adobe of molding.Autoclaved condition is：(maximum pressure 1.15MPa, temperature is 190 for intensification 2h, constant temperature 7h DEG C), lower the temperature 2h.Kettle is gone out after cooling.
Performance indications by the autoclaved lime-sand brick of above-mentioned steps preparation are as shown in table 5.
The steam-pressing brisk performance indications of table 5 embodiment 5 preparation
Embodiment 6：
1. the Pb-Zn tailings of original grade are carried out hydraulic classiciation using hydrocyclone, fine fraction product of skimming, obtain Coarse fraction product as brick-making raw material, the Pb-Zn tailings grade obtaining is -0.074mm ＜ 10% ,+0.16mm ＞ 33% ,+ 1.25mm ＜ 5%, and make its clay content ＜ 5%.Stone fragment is carried out pre-screening, obtain is broken less than 0.01～10mm grade Aggregate chips is transported to feed bin, crushes more than the stone fragment of 10mm grade and be most less than 10mm in jaw crusher.By discarded aerating Jaw crusher put into by concrete, and the product after crushing is sieved, and grade is transported to feed bin less than 0.6mm, and grade is more than The granule of 0.6mm returns jaw crusher to be continued to crush.Carbide slag after drying is put in grinding extremely -0.074mm in ball mill Content accounts for 80%.
2. the Pb-Zn tailings, stone fragment, discarded concrete and the carbide slag that prepare step 1 are according to siccative mass percent lead After zinc mine tailing 46%, stone fragment 20%, discarded concrete 6%, carbide slag 28% mix homogeneously, add siccative gross weight 8% Water is sufficiently stirred for, and mixing time is 10min.Carry out the secondary stirring that adds water, secondary amount of water is siccative gross weight after standing 2h The 2% of amount, mixing time is 5min.
3. the compound stirring obtaining in step 2 is pressed, pressing pressure is 20KN.To suppress Maintenance in still kettle is put in the adobe of molding.Autoclaved condition is：(maximum pressure 1.3MPa, temperature is 185 for intensification 2h, constant temperature 6h DEG C), lower the temperature 2h.Kettle is gone out after cooling.
Performance indications by the autoclaved lime-sand brick of above-mentioned steps preparation are as shown in table 6.
The steam-pressing brisk performance indications of table 6 embodiment 6 preparation
Described above illustrate and describes some preferred embodiments of the present invention, but as previously mentioned it should be understood that the present invention Be not limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and can be used for various other combinations, Modification and environment, and can be in invention contemplated scope described herein, by technology or the knowledge of above-mentioned teaching or association area It is modified.And the change that those skilled in the art are carried out and change without departing from the spirit and scope of the present invention, then all should be at this In the protection domain of bright claims.

Claims (10)

1. a kind of prepare the method for autoclaved lime-sand brick it is characterised in that comprising the following steps using Pb-Zn tailings curing heavy metal：
(1) by Pb-Zn tailings, stone fragment, waste aerocrete, the powder of carbide slag and water mix and blend by a certain percentage 10min, makes material fully mix；
(2), after the material standing 2h after mixing, carry out the secondary stirring that adds water, the secondary stirring time is 5min；
(3) compound is pressed into the adobe of 240mm × 115mm × 53mm, briquetting pressure is 20～30KN；
(4) and then by the adobe suppressing stand stacking, be then fed in still kettle carrying out steam pressure, autoclaved condition is：Intensification 2h, Constant temperature 4～8h, pressure 1.0～1.3MPa, temperature is 170～190 DEG C, and lower the temperature 2h；Kettle is gone out after cooling.
2. method according to claim 1 is it is characterised in that in step (1), the addition of water is the 6 of siccative gross mass ～11%.
3. method according to claim 1 is it is characterised in that in step (2), secondary amount of water accounts for siccative gross mass 2%.
4. method according to claim 1 is it is characterised in that in step (1), and the grade of described Pb-Zn tailings is- 0.074mm ＜ 10% ,+0.16mm ＞ 33% ,+1.25mm ＜ 5%, and make its clay content ＜ 5%.
5. method according to claim 1 is it is characterised in that the grade of described stone fragment is less than 0.01～10mm.
6. method according to claim 1 is it is characterised in that described waste aerocrete grade is less than 1mm.
7. method according to claim 1 is it is characterised in that the grade of described carbide slag accounts for for -0.074mm content 80%, and its water content is less than 1%.
8., it is characterised in that the Pb-Zn tailings of use, wherein chemical analysis are with quality hundred for method according to claim 1 Ratio is divided to be calculated as：SiO245%～65%；Al2O31%～12%；Fe2O3+ FeO 3%～17%；P2O50.01%～4%； MgO 0.1%～8%；CaO 15%～30%；K2O 0.1%～1%；Na2O 0.1%～1%；TiO20.01～0.3%； MnO 0.01～0.7%；Loss on ignition 0.1%～4%, other 0.01%～2%.
9., it is characterised in that the stone fragment of use, wherein chemical analysis are with percent mass for method according to claim 1 Ratio is calculated as：SiO240%～80%；Al2O30.1%～15%；Fe2O3+ FeO 0.1%～10%；SO20.1%～10%； MgO 0.1%～10%；CaO 5%～20%；Other 5%～15%.
10., it is characterised in that the stone fragment of use, wherein chemical analysis are with percent mass for method according to claim 1 Ratio is calculated as：SiO21%～5%；Al2O30.1%～5%；Fe2O3+ FeO 0.01%～5%；CaO 40%～80%；K2O 0.1%～1%；Na2O 0.1%～1%；Loss on ignition 20%～30%；Other 0.1%～3%.
CN201610906673.2A 2016-10-18 2016-10-18 A kind of method preparing autoclaved lime-sand brick using Pb-Zn tailings curing heavy metal Pending CN106478034A (en)

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