CN101912865A - Method for solidifying and dry-stacking mill tailings without tailing reservoir - Google Patents
Method for solidifying and dry-stacking mill tailings without tailing reservoir Download PDFInfo
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- CN101912865A CN101912865A CN 201010241928 CN201010241928A CN101912865A CN 101912865 A CN101912865 A CN 101912865A CN 201010241928 CN201010241928 CN 201010241928 CN 201010241928 A CN201010241928 A CN 201010241928A CN 101912865 A CN101912865 A CN 101912865A
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- mine tailing
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- 238000002386 leaching Methods 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
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- 239000011701 zinc Substances 0.000 claims description 8
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- 238000001764 infiltration Methods 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 5
- 229910052602 gypsum Inorganic materials 0.000 claims description 5
- 239000010440 gypsum Substances 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
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- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 3
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- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 2
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- 238000005056 compaction Methods 0.000 claims description 2
- 239000011790 ferrous sulphate Substances 0.000 claims description 2
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000012141 concentrate Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 1
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 239000003344 environmental pollutant Substances 0.000 description 14
- 231100000719 pollutant Toxicity 0.000 description 14
- 239000008187 granular material Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
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- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 239000006210 lotion Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
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- 238000013461 design Methods 0.000 description 2
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- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
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- 235000019738 Limestone Nutrition 0.000 description 1
- 229910020218 Pb—Zn Inorganic materials 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 244000169641 Spondias dulcis Species 0.000 description 1
- 235000005138 Spondias dulcis Nutrition 0.000 description 1
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- WNQQFQRHFNVNSP-UHFFFAOYSA-N [Ca].[Fe] Chemical compound [Ca].[Fe] WNQQFQRHFNVNSP-UHFFFAOYSA-N 0.000 description 1
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- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a method for solidifying and dry-stacking mill tailings without a tailing reservoir, comprising the following steps of: firstly, concentration of tailings: introducing the mill tailings into a concentration basin and adding a coagulant to concentrate the tailings to the state of the mass concentration greater than 50%; secondly, solidification of the tailings: guiding the concentrated tailings into a solidifying stirrer, mixing with a solidifying agent and stirring; thirdly, primary curing of the solidified tailings: stacking the solidified tailings for 24 hours to carrying out primary curing; and fourthly, dry stacking of the solidified tailings: filling the primarily cured solidified tailings in a stacking field by using a layered and subdivided filling method, and compacting after each-layer filling. The method has the advantages that the liquid tailings are solidified into solidified bodies having certain strength and meeting the requirement of environmental quality and can be directly stacked in the stacking field without establishing the tailing reservoir, thereby thoroughly eliminating the wet stacking stability and environmental pollution risks of the tailings in the tailing reservoir, saving the land occupied area of the stacking field and having remarkable economic, social and environmental benefits.
Description
Technical field
What the present invention relates to is a kind of milltailings method for solidifying and dry-stacking of not establishing the mine tailing storehouse, is applicable to high-moisture percentage, high fineness, contains the safe disposal engineering of the milltailings of pollutants such as heavy metal, belongs to mine and field of environment engineering technology.
Background technology
Mine tailing is as the byproduct of mine ore dressing, be a kind of high-moisture percentage solid waste that does not have intensity, contains pollutant, very easily liquefies and flow, the a large amount of mine tailing of China mainly is placed as the master so that the mine tailing storehouse to be set at present, because the mine tailing stock is in great dam break risk under heavy rain or geological process, and the pollutant in the mine tailing storehouse also has great Environmental security hidden danger to surface water, underground water and soil around the storehouse.According to national Work Safety Supervision Bureau statistics in the end of the year 2008, by the end of the end of the year 2008, national mine tailing storehouse amounts to 12655, wherein normal 7745 in storehouse (accounting for 61%), danger 613 in storehouse (accounting for 5%), 1265 in dangerous storehouse (accounting for 10%), about 7,000,000,000 tons of all kinds of mine tailing total amounts are stored up in sick 3032 in storehouse (accounting for 24%).Early stage mine tailing storehouse is difficult to satisfy stability and safety and Environmental security simultaneously in design, construction and operation mostly, has caused numerous mine tailing storehouse destructive insidents.As on September 26th, 1962, all mine tailing storehouse dam breaks of the cloud tin Huo Gu of company caused 171 people's death, injured 92 people, population suffered from disaster 13970 people.August in 1985, the storehouse dam break of Hunan on the 25th persimmon bamboo plantation mine tailing caused 49 people's death.Anhui on April 30 yellow plum mountain iron ore mine storehouse dam break in 1986 causes 19 people's death, injured 100 people.On July 16th, 1994, Hubei Province Daye Nonferrous Metal Co.,Ltd dragon hornberg copper mine was because heavy rain impacts the dam break of mine tailing storehouse, dead 28 people, missing 3 people.On October 18th, 2000, the dam that collapses, the profit mill tailings storehouse, stand that Nandan County Da Chang town, Guangxi sour water is thin causes 28 people's death, and up to a hundred houses are ruined.Gold tailings storehouse, Zhenan County, Shaanxi on the 30th April in 2006 is when adding dam increase-volume construction to its mine tailing storehouse the 6th phase of implementing, part main body dam collapses, and causes 15 people's death, 2 people are missing, 5 people are injured.Mine tailing storehouse, Xiangfen, Shanxi on the 8th September in 2008 dam-break accident causes 254 dead 34 major accidents of hindering.The harm of mine tailing storehouse accident has at present become one of the world's the 18th big public hazards.
Since the mine tailing stock problems, country has also strengthened management being provided with of mill tailings storehouse on the problem, safety and environmental impact assessment all must be carried out in a lot of new storehouses in planning, and design and construction criteria all improve greatly.Present many mines cause production to be faced adverse conditions because mine tailing can not be properly settled, and demand developing new mine tailing safe disposal technology urgently.
Method of disposal to mine tailing has the way of carrying out the dry type stacking after the dehydration adopted at present, as Chinese invention patent numbers 200910094443.0, patent name: a kind of tailing dry heaping method, stack by concentrating with the dry type of method realization mine tailing in the mine tailing storehouse of natural drainage, this method in case rain can make that water-filling is saturated again in the mine tailing, very easily form mud-rock flow, and the pollutant in the mine tailing is easy to also diffuse out surrounding environment generation pollution along with rainwater.Chinese invention patent numbers 200510124013.0 for another example, patent name: the high concentration high viscosity mine tailing is carried and stacked arrangement, the method of thickening is adopted in this invention, the mine tailing slurry viscosity brought up to carry out dry method more than the 10000mPa.s and store up, because the intergranular bond of mine tailing is very weak, pollutant in the mine tailing is not stablized, and this method still exists the risk of great secondary argillization and pollutant migration conversion under the rainwater effect.
Also there is at present pair mine tailing to carry out the glued back of handling and in the stockyard, carries out the method that dry type is stacked; as Chinese invention patent numbers 200610109277.3; patent name: a kind of stacked arrangement of bauxite; bauxite at weight concentration 20%～70%; utilize cement; lime; gypsum; waterglass; and flyash; granulated blast-furnace slag; gangue; red mud; the silicon ash; volcanic ash; materials such as float stone carry out gluing with mine tailing to be handled; the addition content of base-material be dried mine tailing heavy 10%～70%; gelling exciting agent addition be dried mine tailing heavy 0%～15%, mine tailing mixes with curing agent and stirs lotion that the back forms weight concentration 30%～85% and carry out fluidization stack in the mine tailing storehouse.Because the slump of lotion is 10cm～29cm, therefore be difficult to control piling height and the stacking scope of lotion in the mine tailing storehouse, the stocking angle of storing up body is generally 13～22 degree.Therefore do not relate in this invention simultaneously the pollutant in the mine tailing is carried out stabilization processes, be placed in the mine tailing storehouse pollutant and still can move and be transformed in the surrounding environment medium, there is higher environmental pollution risk in this stacked arrangement.
Also has Chinese invention patent numbers 200610156329.2, patent name: a kind of method of bauxite ore dressed and ore cleaned tailings piling, this method at first mine tailing is concentrated or dehydration after reach and contain admittedly greater than 600g/L, with pulverized limestone as main curing agent, add anhydrite again, flyash, slag powders or sulfate are as auxiliary curing agent, the addition of total curing agent is 0.5%～50% of a mine tailing weight, curing agent and mine tailing are delivered directly to behind mechanical mixing and carry out compacting curing processing in the mine tailing storehouse, because mine tailing and curing agent have just stirred and have come out still to be flow regime, the shortcoming that has transportation inconvenience and be difficult to compacting in the stockyard, can not realize bigger stacking height, this method does not equally realize the stablizing effect of pollutant in the mine tailing yet simultaneously, is placed on to have the environmental pollution risk in the mine tailing storehouse yet.
Summary of the invention
No matter wet type is stacked, dehydration back dry type stacks to the present invention is directed to present mine tailing, and technology such as glued or the dry type stacking of curing back still need to be provided with the mine tailing storehouse, and the mine tailing stock provides a kind of milltailings method for solidifying and dry-stacking of not establishing the mine tailing storehouse in the problem of bigger stable or Environmental security risk.This method at first concentrates the mine tailing after the ore dressing back importing solidifying mixer and mixes stirring with curing agent, be transported to the stacking place of not establishing tailing dam in 24 hours again through maintenance afterwards and roll and fill, can realize after filling that the long-term safety of solidifying mine tailing stores up or recycling.
Technical solution of the present invention: a kind of milltailings method for solidifying and dry-stacking of not establishing the mine tailing storehouse is characterized in that this method may further comprise the steps:
One, mine tailing concentration, milltailings enters concentration basin, adds coagulant 60～90 grams in the dried mine tailing per ton, and mine tailing is condensed into mass concentration greater than 50% state;
Two, mine tailing solidifies processing, and the mine tailing after concentrating is imported solidifying mixer and curing agent mixing stirring, adds 50～200 kilograms in curing agent in every cubic metre of mine tailing;
Three, solidify the initial curing of mine tailing, the mine tailing after curing is handled is banked up and was carried out initial curing in 24 hours, and the initial stage unconfined compressive strength that solidify mine tailing this moment reaches 25～50kPa;
Four, the dry type of solidifying mine tailing is stored up, the method that in stacking the place, adopts layering, subdivision to fill through the curing mine tailing of initial curing, and every layer is carried out compaction treatment after filling; 28 days cohesiveness 〉=40kPa of filling body, internal friction angle 〉=30 degree when filled height is below 30 meters, fills slope angle and is 45 degree when following, and the safety coefficient of filling body stability of slope is greater than 1.5; The infiltration coefficient of filling body is less than 1 * 10
-6Cm/s tests according to the HJ/T299-2007 method, and the leaching amount of copper is less than 100mg/L in the filling body test block, the leaching amount of zinc is less than 100mg/L, and the leaching amount of cadmium is less than 1mg/L, and plumbous leaching amount is less than 5mg/L, the leaching amount of chromium is less than 15mg/L, and the leaching amount of arsenic is less than 5mg/L.
Advantage of the present invention: great advantage is not need to be provided with the mine tailing storehouse just can realize that mine tailing storing up for a long time stacking stable and pollution-free on the place than small size, its effect mainly come from institute's curing agent that uses and dam filling construction to mine tailing in the effect aspect mechanical property and the pollutant stable two:
(1) the mechanical property aspect of raising mine tailing
Curing agent is one or two or more kinds of cement, lime, flyash, gypsum, when it joins concentration when being higher than in 40% the mine tailing, hydration reaction, pozzolanic reaction, carbonic acid reaction and ion-exchange reactions can take place, main hydrated calcium silicate, drated calcium aluminate, aquation iron calcium aluminate, calcium hydroxide, calcium carbonate and the entringite of generating, entringite is a kind of crystal attitude material with 32 crystallizations water, for the moisture mine tailing of height, generate entringite is the effective means that improves intensity more.Hydrated product combines with water in course of reaction and has consumed the moisture in the slurry, and the product that generates has glued character, the mine tailing granular cementation can be got up, the a large amount of entringite that generate can be supported on again in the glued mine tailing particle and form skeleton, so the gluing of hydrated product and skeleton supporting role are the main sources of curing agent intensity.Rely on the effect of curing agent, solidify 28 days cohesiveness 〉=40kPa of mine tailing filling body, internal friction angle 〉=30 degree, when filled height is below 30 meters, fill slope angle and be 45 degree when following, the safety coefficient of filling body stability of slope is greater than 1.5, and filling body can be realized stablizing for a long time.Higher filled height has also been saved the floor space of stacking the field simultaneously.
(2) the stable aspect of pollutant in the raising mine tailing
The hydrated product that curing agent reaction back produces has bigger adsorptivity, the heavy metal of easy stripping in the mine tailing can be adsorbed, is wrapped in the firming body, makes it be difficult for entering in the surrounding medium.The hydrated product of crystalline state also can be attached to pollutant in the crystal simultaneously, makes heavy metal become more stable chemical binding state, is not easy more to be discharged in the environment.Mine tailing is behind overcuring, and its infiltration coefficient is less than 1 * 10
-6Cm/s, the soluble state heavy metal is difficult to along with moisture oozes out.For such firming body, even under very disadvantageous acid rain condition, the pollutant that is absorption, parcel or crystalline state can not moved in the surrounding environment in a large number yet, thereby has realized that mine tailing do not establish the Environmental security that mine tailing storehouse dry type is stored up.
According to above technical scheme, can realize following beneficial effect:
(1) solidifies the mine tailing of handling fluidised form and change filler into, and pollutant is enclosed in the firming body, realized not establishing the mine tailing storehouse and just can carry out stability and the Environmental security that dry type is stored up mine tailing with certain intensity;
(2) solidify mine tailing through initial curing, be convenient to transport and fill, thereby can realize higher filled height, save the area of stacking the place;
(3) mine tailing of stacking in the place can use as good fill material, also can take use away from the stockyard when requirement of engineering is arranged, and stacks an occupation of land thereby vacate;
(4) processing cost of the present invention is low, efficient is high, can work continuously, and meets the requirement of mine tailing safe disposal.
The specific embodiment
Nonrestrictive each the related parameter of the embodiment of the invention that disclosed of table 1 explains the technical scheme of embodiment involved in the present invention below with reference to table 1.
Embodiment 1
A kind of Pb-Zn tailings, wherein＞74 micron granule content accounts for 27.40%, 37～74 microns granule content and accounts for 15.90%, and＜37 microns granule content accounts for 56.70%, and its material consists of: SiO
2Account for 36.79%, Al
2O
3Account for 1.72%, MgO accounts for 2.15%, CaO accounts for 30.15%, Fe
2O
3Account for 15.11%, other compositions account for 14.08%.According to the HJ/T299-2007 method mine tailing is tested, the leaching amount of copper is that 100.6mg/L, zinc are that 300mg/L, cadmium are that 1.3mg/L, the plumbous 100.8mg/L of being, chromium are that 40mg/L, arsenic are 16.21mg/L in the mine tailing that is untreated.The mass concentration of mine tailing is 30% before concentrating, and adds polyacrylamide or aluminium polychloride or polyaluminium sulfate 60 grams by dried mine tailing per ton, precipitates the mine tailing that formed mass concentration 73% in 6 hours.Add 80 kilograms of cement hardener mixing stirrings in every square tail ore deposit, the unconfined compressive strength that stirs back maintenance curing in 24 hours mine tailing sample is 40kPa, and the density in the time of will filling 28 days in the stockyard through the curing mine tailing of initial curing is 1650kg/m
3, cohesiveness be 80kPa, internal friction angle be 40 the degree, infiltration coefficient is 0.5 * 10
-6Cm/s, according to the HJ/T299-2007 method 28 days curing mine tailing is tested, the leaching amount of copper is that 78mg/L, zinc are that 87mg/L, cadmium are 0.8mg/L, plumbous for 4.5mg/L, chromium are that 12mg/L, arsenic are 3.2, less than the limit value of stipulating among the GB 5085.3-2007.Stacking highly is 30 meters, and stacking slope angle is 45 degree, and this moment, the buckling safety factor of filling body was 2.4, satisfied the needs of filling body long-term stability.
Embodiment 2
A kind of iron tailings, wherein＞74 micron granule content accounts for 14.20%, 37～74 microns granule content and accounts for 13.10%, and＜37 microns granule content accounts for 72.70%, and its material consists of: SiO
2Account for 70.70%, Al
2O
3Account for 3.17%, MgO accounts for 3.22%, CaO accounts for 6.04%, Fe
2O
3Account for 10.60%, other compositions account for 6.27%.According to the HJ/T299-2007 method mine tailing is tested, the leaching amount of copper is that 86.7mg/L, zinc are that 20.8mg/L, cadmium are that 2mg/L, the plumbous 46.2mg/L of being, chromium are that 10.19mg/L, arsenic are 8.33mg/L in the mine tailing that is untreated.The mass concentration of mine tailing is 25% before concentrating, and adds polyacrylamide 45 grams and ferrous sulfate 45 grams by dried mine tailing per ton, precipitates the mine tailing that formed mass concentration 50% in 6 hours.In every square tail ore deposit, add 200 kilograms of curing agent (wherein cement accounts for 80%, gypsum accounts for 20%) and mix stirring, the unconfined compressive strength that stirs back maintenance curing in 24 hours mine tailing sample is 50kPa, and the density in the time of will filling 28 days in the stockyard through the curing mine tailing of initial curing is 1520kg/m
3, cohesiveness be 100kPa, internal friction angle be 35 the degree, infiltration coefficient is 0.1 * 10
-6Cm/s, according to the HJ/T299-2007 method 28 days curing mine tailing is tested, the leaching amount of copper is that 57mg/L, zinc are that 10.7mg/L, cadmium are 0.9mg/L, plumbous for 3.8mg/L, chromium are that 6.8mg/L, arsenic are 4.3mg/L, less than the limit value of stipulating among the GB 5085.3-2007.Stacking highly is 30 meters, and stacking slope angle is 45 degree, and this moment, the buckling safety factor of filling body was 2.6, satisfied the needs of filling body long-term stability.
Embodiment 3
A kind of copper mine tailing that selects, wherein＞74 micron granule content accounts for 8.50%, 37～74 microns granule content and accounts for 9.10%, and＜37 microns granule content accounts for 82.40%, and its material consists of: SiO
2Account for 63.94%, Al
2O
3Account for 15.78%, MgO accounts for that v%, CaO account for 2.22%, Fe
2O
3Account for 3.74%, other compositions account for 12.35%.According to the HJ/T299-2007 method mine tailing is tested, the leaching amount of copper is that 325.1mg/L, zinc are that 35.1mg/L, cadmium are that 2.4mg/L, the plumbous 53.8mg/L of being, chromium are that 35.7mg/L, arsenic are 1.9mg/L in the mine tailing that is untreated.The mass concentration of mine tailing is 31% before concentrating, and adds polyacrylamide 30 grams and poly-ferric chloride 20 grams and poly-ferric chloride 20 grams by dried mine tailing per ton, precipitates the mine tailing that formed mass concentration 65% in 6 hours.In every square tail ore deposit, add 120 kg curing agent (wherein cement accounts for 25%, lime accounts for 10%, flyash accounts for 50, gypsum account for 15%) and mix stirring, the unconfined compressive strength that stirs back maintenance curing in 24 hours mine tailing sample is 35kPa, and the density in the time of will filling 28 days in the stockyard through the curing mine tailing of initial curing is 1630kg/m
3, cohesiveness be 70kPa, internal friction angle be 40 the degree, infiltration coefficient is 0.9 * 10
-6Cm/s, according to the HJ/T299-2007 method 28 days curing mine tailing is tested, the leaching amount of copper is that 88.5mg/L, zinc are that 21.7mg/L, cadmium are 0.77mg/L, plumbous for 3.9mg/L, chromium are that 8.5mg/L, arsenic are 0.9mg/L, less than the limit value of stipulating among the GB 5085.3-2007.Stacking highly is 30 meters, and stacking slope angle is 45 degree, and this moment, the buckling safety factor of filling body was 2.3, satisfied the needs of filling body long-term stability.
Claims (5)
1. milltailings method for solidifying and dry-stacking of not establishing the mine tailing storehouse is characterized in that this method may further comprise the steps:
One, mine tailing concentration, milltailings enters concentration basin, adds coagulant 60～90 grams in the dried mine tailing per ton, and mine tailing is condensed into mass concentration greater than 50% state;
Two, mine tailing solidifies processing, and the mine tailing after concentrating is imported solidifying mixer and curing agent mixing stirring, adds 50～200 kilograms in curing agent in every cubic metre of mine tailing;
Three, solidify the initial curing of mine tailing, the mine tailing after curing is handled is banked up and was carried out initial curing in 24 hours, and the initial stage unconfined compressive strength that solidify mine tailing this moment reaches 25～50kPa;
Four, the dry type of solidifying mine tailing is stored up, the method that in stacking the place, adopts layering, subdivision to fill through the curing mine tailing of initial curing, and every layer is carried out compaction treatment after filling; 28 days cohesiveness 〉=40kPa of filling body, internal friction angle 〉=30 degree when filled height is below 30 meters, fills slope angle and is 45 degree when following, and the safety coefficient of filling body stability of slope is greater than 1.5; The infiltration coefficient of filling body is less than 1 * 10
-6Cm/s tests according to the HJ/T299-2007 method, and the leaching amount of copper is less than 100mg/L in the filling body test block, the leaching amount of zinc is less than 100mg/L, and the leaching amount of cadmium is less than 1mg/L, and plumbous leaching amount is less than 5mg/L, the leaching amount of chromium is less than 15mg/L, and the leaching amount of arsenic is less than 5mg/L.
2. according to the described a kind of milltailings method for solidifying and dry-stacking of not establishing the mine tailing storehouse of claim 1, it is characterized in that the described coagulant of step 1 is one or two or more kinds of polyacrylamide, aluminium polychloride, ferrous sulfate, poly-ferric chloride, polyaluminium sulfate.
3. select a kind of milltailings method for solidifying and dry-stacking of not establishing the mine tailing storehouse according to claim 1 is described, it is characterized in that, the described curing agent of step 2 is one or two or more kinds of cement, lime, flyash, gypsum.
4. according to the described a kind of milltailings method for solidifying and dry-stacking of not establishing the mine tailing storehouse of claim 1, it is characterized in that the described mixing stirring of step 2 is meant stirred mine tailing slurry and curing agent 1～5 minute in solidifying mixer.
5. according to the described a kind of milltailings method for solidifying and dry-stacking of not establishing the mine tailing storehouse of claim 1, it is characterized in that, the described curing mine tailing stacking of step 4 place is not built tailing dam, do not do the place antiseepage, drainage measure is not set, and the curing mine tailing direct filling after the process initial curing is in stacking the field.
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| CN111530624B (en) * | 2020-05-12 | 2022-03-04 | 云南金鼎锌业有限公司 | Mineral separation combined process for recovering pyrite and zinc oxide from lead-zinc tailings |
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