CN101810130A - Method for using major metal tailings after harmless treatment as culture medium - Google Patents
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Abstract
The invention discloses a method for using ten or more major metal tailings after harmless treatment as a culture medium, wherein the metal tailings comprise iron (Fe) tailings, alumina (Al) tailings, molybdenum (Mo) tailings, lead zinc (Pb), (Zn) tailings, nickel (Ni) tailings, copper (Cu) tailings, manganese (Mn) tailings, tungsten (W) tailings, tin (Sn) tailings, aurum (Au), and the like, namely a method for recovering valuable elements (components) and using five major metals of Hg, Pb, Cr, Cd after harmless treatment as a greenhouse substrate for solanaceous fruit and melon vegetables and a turf culture substrate.
Description
Technical field
The invention belongs to agroecological environment and recycling economy interleaving techniques field, mine.
Noun defines
(1) major metal mine tailing: the metal tailings that the present invention relates to is: 10 kinds of common metal tailings such as iron (Fe) mine tailing, alum clay (Al) mine tailing (red mud), molybdenum (Mo) mine tailing, plumbous zinc (Pb, Zn) mine tailing, nickel (Ni) mine tailing, copper (Cu) mine tailing, manganese (Mn) mine tailing, tungsten (W) mine tailing, tin (Sn) mine tailing, gold (Au) mine tailing, do not contain whole metal tailings, so be called the major metal mine tailing.
(2) innoxious: comprise three aspects, the first, according to present advanced person's the technology that sorts, after valuable element in the metal tailings (component) recovery, main heavy metal Hg, Pb, Cd, As reclaim Cr from tail gas
2O
3Magnetic separation is reclaimed, and residual heavy metal adopts passivating technique, makes it to be converted into the stable state compound; The second, eliminate the harm of poisonous, harmful ore dressing additive, the sodium salt in the cyanide in for example golden mine tailing, alum clay and other mine tailing, organic compound etc.; The 3rd, SiO in the metal tailings
2Mainly be distributed in quartz, the feldspar, quartz should not be used on soil, and particularly light soil should be separated quartzy and part feldspar, as the building materials raw material.SiO in the mine tailing after the harmless treatment
2Content is no more than 35%.
(3) heavy metal passivation: after heavy metal reclaimed from tail gas, residual heavy metal was converted into silicate stable state compound under hot conditions, be called the heavy metal passivation.
Background technology
1. China's metal tailings present situation and harm
According to incompletely statistics, former China metal tailings total amount was 50.26 hundred million t in 2000, wherein, and iron tailings amount 26.14 hundred million t, main non-ferro metals debris amount 21.09 hundred million t, gold tailings amount 2.72 hundred million t, other 0.31 hundred million t.Discharging mine tailing amount reached 600,000,000 t in 2000, calculated in view of the above, and the total amount of existing mine tailing should be more than 8,000,000,000 t, but also in the speed increment (online issue in Ministry of Industry and Information's on June 19th, 2009: the comprehensive utilization of tailing potentiality are abundant) to produce 500,000,000 t mine tailings every year.
These mine tailings also destroy ecotope except taking a large amount of soils, cause serious water and soil loss, airborne dust and polluted source.Geological disasters such as the debris flow of hiding in a large amount of mine tailing storehouses, landslide, dam break are endangering Chinese society and economic sustainable development constantly.
For example occurred in the black burn incident of the Northwest in 1993, because sandstorm is all thrown one 340,000 t nickel of Gansu Jinchang City mine tailing sky and formed a rare black burn, cause 85 people's death exactly, 31 people are missing, and 264 people are injured; The death of 120,000 (only) livestocks, lose, 730,000 (only) livestocks are injured; 370,000 hectares of crops are disaster-stricken, 4330 house collapses, and direct economic loss reaches 7.25 hundred million yuans.Iron tailings storehouse, tower mountain, Xiangfen County, Linfen, Shanxi Province on the 8th September in 2007 collapses the dam incident for another example, causes 268 people wrecked or missing.
2. China's metal tailings recycling present situation and problem
(1) utilizes present situation
1) the most metallic ores of mine tailing secondary sorting recovery valuable metal element and nonmetalloid China are symbiosis and association mineral deposit.The National Development and Reform Commission points out in the Eleventh Five-Year Plan comprehensive utilization of resources instruction of sending on December 24th, 2006: " continue to support Panzhihua, Bayan Obo, Jinchuan three large resources comprehensive utilization construction of base ... attach most importance to iron ore, copper mine, bauxite, gold mine, plumbous zinc ore, tungsten ore, build several spoil reclaming demonstration projects." domestic each state operated mining enterprise all carries out the recovery operation of valuable metal element to some extent.
2) metal tailings is agricultural 1971, Zhang Fudao, Jiang Xiaoli and former Shandong Zibo aluminium manufacturer cooperate, utilize this factory's red mud, behind the water wash-out sodium salt, 47 field fertilizer efficiencies have been arranged at Jinhua, Zhejiang and Jiangxi red earth area, crop is a paddy rice, rape, barley, corn, soybean, broad bean, citrus, volume increase 8.5%～17.0%, (soil and fertilizer research institute of the Chinese Academy of Agricultural Sciences transferred to the Shandong Dezhou City in 1970 on the scientific research annual report in 1972 in Shandong Province's soil and fertilizer research institute in the result of study publication, in the Shandong Province, claim earth fertilizer research institute in the Shandong Province, when at a time when during " Culture Revolution ", all academic journals are suspended publication, and clay fertilizer used " annual report " form exchanges with associate organization).Zhang Fudaos in 1973 etc. utilize Zhaoyuan, Shandong high phosphorus gold mine tailing to produce superphosphate, preside over by the chemical industry Room, Shandong Province, built up annual output 5000t phosphate fertilizer plant, the research is summed up " select add sulfuric acid in the golden waste residue remove cyanide and produce general calcium technology " publication on 1974 the 5th phase bulletins in Shandong Province's soil and fertilizer research institute scientific research annual report in 1974 and the chemical industry Room, Shandong Province.Because of environmental consciousness was too shallow at that time, only consider to remove cyanide, do not consider heavy metal pollution problem, do not measure content of beary metal in the mine tailing yet.
3) be used to produce the raw material, paveio(u)r, devitrified glass raw material etc. of common wall body brick, cement raw material, ornament materials as the construction material metal tailings.
4) as the mine worked-out section filler.
5) by magnetization, as soil conditioner and magnetic fertilizer.
6) utilize mine tailing to reclaim and plant crops.
(Guo Jianwen etc., China's iron tailings current resources situation and comprehensive utilization, modern mining industry, 2009 (10) 23～25)
(2) existing problems:
1) the mine tailing availability is low
Data had only for 10%～12% (comprising the colliery) to China's mine land reclamation rate in 2008 according to statistics, and the metal tailings comprehensive utilization ratio has only about 8.2%.
2) heavy metal contaminants diffusion
According to mensuration such as Huang Lanchun, big Golconda mine tailing is directly used in the manufacturing magnetic fertilizer, content of beary metal severe overweight problem occurs.Wherein, Cr exceeds standard 6.8 times, and Pb exceeds standard 12.7 times, and incorporation of fertilizerin the soil will cause the diffusion (Huang Lanchun etc., big Golconda metal sulfide ore tailings comprehensive Utilization Ways research, metal mine, 2009 (7) 164～168) of heavy metal contaminants.
3) the mine tailing problem of reclaiming
1. mine tailing is reclaimed kind of plant with enriching heavy metal, and it is edible all dangerous no matter the people still is livestock and poultry.
2. still have debris flow hidden danger, mine tailing claims tailings again, and its physical property is as quicksand, even earth backing is planted trees also dangerous on the mine tailing storehouse.The tailing dam of China more than 90% built and built in the mountain valley, exceeds tens of meters even hundred meters of residential blocks, downstream, still has the danger of collapsing dam generation debris flow if Freshets roar down from the mountains.Old mine tailing storehouse, Ningan City, Heilongjiang Province Sha Lan town for example might be that the Japanese opens a mine when puppet is full and carries over, and is that forest is dense already, and on June 11st, 2005, Jiang Shalan town primary school flowed or blow over and cover completely because of heavy rain generation debris flow, 105 pupil's death.
Goal of the invention:
1. replace the peat composed of rotten mosses, peat and arable soil with the metal tailings raw material after the harmless treatment,, both saved the peat composed of rotten mosses and peat, protected the arable land again as cultivation matrix.
2. during mine tailing is rich in, trace element, in can replacing, the trace element chemicals.
Summary of the invention
The present invention will plant matrix as solanberry class, gourd vegetables greenhouse cultivation matrix and turf after iron tailings, alum clay mine tailing, molybdenum mine tailing, Pb-Zn tailings, nickel mine tailing, copper mine tailing, manganese mine tailing, tungsten mine tailing, tailing, 10 kinds of metal tailings harmless treatments of golden mine tailing, and its raw material proportioning is as follows:
(1) solanberry class, gourd vegetables greenhouse cultivation matrix: the matrix of nutrient fluid drip irrigation planting patterns is formed, and by butt, innoxious up to standard and be milled to 300 order mine tailings and account for 70%～80%, silt loam accounts for 30%～20%; Full nutrient matrix-water droplet is irritated the matrix of planting patterns and is formed, and by butt, innoxious up to standard and be milled to 300 order mine tailings and account for 25%～30%, fermentation maturity feces of livestock and poultry up to standard accounts for 10%～15%, the special-purpose slowly/controlled releasing fertilizer (N: P of vegetables
2O
5: K
2O=1: 0.4～0.5: 1.2～1.5) account for 65%～55%;
(2) compounded turf matrix: by butt, innoxious up to standard and be milled to 200 purpose mine tailings and account for 50%～55%, fermentation maturity domestic sludge up to standard accounts for 50%～45%.
Specific descriptions of the present invention:
One, the agricultural harmless treatment of major metal mine tailing
Number according to iron content is divided, and 10 kinds of metal tailings is divided into two big classes: the metal tailings that non-iron tailings and iron-holder are low, iron tailings and high Fe content mine tailing; The former adopts method recovery Hg, Pb, Cd, Cr, As 5 heavy metal species that add dolomite, dissolve oxidation under alkali condition, the latter adopts full carbon reduction method to reclaim iron and 5 heavy metal species, the passivation under hot conditions of residual heavy metal is converted into the stable state compound; No matter be which kind of type mine tailing, every is gangue mineral, SiO with quartzy, feldspar
2Content all at first separates quartzy and part feldspar recovery SiO greater than 35%
2
(1) the low metal tailings of non-iron ore mine and iron-holder
1. valuable element (component) reclaims again
(1) valuable metal element (component) reclaims again
Carrying out valuable metal element (component) according to present advanced person's associated metal component sorting process reclaims again.
(2) SiO
2Separate and reclaim
SiO
2Be the solvent of soil, even in the minimum laterite of content, SiO
2Content is also 35.57%～42.55%.Do not formulate at present the agricultural standard of metal tailings as yet, preside over " the long-term position monitor base complex of national soil fertility and the fertilizer benefit " experience in 15 years, be manured into soil SiO as long as mine tailing is agricultural according to me
2Content should not surpass 35%.
SiO
2Mainly be distributed in gangue mineral quartz, feldspar, muscovite, a small amount of biotite, olivine, talcum, the serpentine, wherein the distributive law in quartzy and feldspar accounts for more than 80%, and quartzy, the granularity of feldspar in mine tailing is generally 0.03～0.5mm.Test of many times result adopts separable quartz and the feldspar that goes out more than 90% of cyclone separator, that is to say the separable SiO that goes out more than 72%
2, quartz of separating and feldspar can be used for the raw material of building materials.
2. the removal of poisonous, harmful ore dressing additive and innoxious
These ore dressing additives mainly comprise mercurial, cyanide, and sodium salt, organic compound etc., sodium salt is converted into sodium silicate under hot conditions, and organic compound will decompose, and mercury reclaims from tail gas; Potassium cyanide, Cymag in the gold mine tailing are all water-soluble, behind the water wash-out, add sulfuric acid in eluting water, generate HCN, with air exhauster HCN gas are sent in the NaOH buck jar and are generated NaCN, recycling; The sodium salt of alum clay mine tailing is the water wash-out repeatedly, and eluting water recycles.
3. the recovery of heavy metal, passivation and in, the activation of trace element
The heavy metal element that soil and fertilizer circle and environmental protection circle are generally acknowledged is mercury (Hg), plumbous (Pb), chromium (Cr), cadmium (Cd), arsenic (As).
The reference standard:
Before not formulating the metal tailings agricultural standards, can use for reference " the agricultural shale of urban wastewater treatment firm sludge treatment " heavy metal limit value index (CJJ309-2009), total cadmium and total mercury: A level＜3mg/kg, B level＜15mg/kg; Total plumbous: A level＜300mg/kg, B level＜1000mg/kg; Total chromium: A level＜500mg/kg, B level＜1000mg/kg; Total arsenic: A level＜30mg/kg, B level＜75mg/kg.
(1) chromium (Cr)
Chromium does not have independent mineral deposit, modally is and the iron association, might be to compose with form coated or that adhere to be stored in the high metallic ore of iron ore and iron-holder Cr
2O
3Have magnetic, but magnetic separation is reclaimed.
(2) other heavy metal element
1) batching
Adopt the mode of adding basic anhydride MgO and CaO (dolomite) cooling auxiliary agent, reduce the frit reaction temperature and finish below 1200 ℃.If mine tailing neutral and alkali oxide molar total amount is greater than acidic oxide mole total amount, can not add dolomite, also can reach the purpose of finishing reaction below 1200 ℃, in order to promote the more tail gas that enter of heavy metal, be convenient to reclaim, temperature is decided to be 1200 ℃～1250 ℃, test of many times proves, add to react more thorough into 3%～5% amount of auxiliary on theoretical value, the amount that reclaims heavy metal is more.
Acidic oxide: SiO
2, Al
2O
3, Fe
2O
3, SO
3 -2Basic anhydride: Na
2O, K
2O, CaO, MgO.Test dolomite (MgCO
3CaCO
3) select Tianzhen County, Shanxi dolomite mineral, MgO content 32.85%, CaO content 15.25%, (MgO+CaO) the mole total amount is 1.087.
2) roasting
With mine tailing (if the SiO in the mine tailing behind sorting quartz and the feldspar
2Content is no more than 35% does not need sorting) be milled to-200 purpose dolomite dusts and mix, advance to turn round calcining kiln, 1200 ℃～1250 ℃ of sintering temperatures, roasting time 20～25min.
Observe material variation in the kiln from peephole, with full-fusing the best.
Tail gas recycle heavy metal: result of the test, recyclable most Hg, Cd, As, Pb, Cr
2O
3Magnetic separation is reclaimed, and residual heavy metal is converted into silicate stable state compound.
3) shrend and in, trace element activation
With the quick shrend fusion of giant mine tailing mixed material, about 20% silicate and in, trace element forms solubility in citric acid available state compound.
4) the air-dry molten mass material of airing is through being the irregular particle thing, ground on the scene airing, natural air drying after the shrend fast.
5) if adjust pH and the levigate innoxious mine tailing of oven dry use, then need regulate pH value to 7.0～7.5 on nonacid soil, oven dry, levigate to-300 orders with 3%～5% sulfuric acid solution.
(2) the high mine tailing of iron tailings and iron-holder
1.SiO
2Separate and reclaim
Every SiO
2Content is greater than 35% and be the metal tailings of gangue mineral with quartzy, feldspar, uses cyclone separator that quartz separated recovery with the part feldspar, is used as the raw material of building materials.
2. iron reclaims
Adopt the method for carbon reduction, with Fe
2O
3Be converted into Fe
3O
4, FeO is converted into Fe, CO
2Absorb generation CaCO with CaO
3, guarantee to react and carry out to right.Carbon reduction reaction, except that scheme 1 (inventor is called half carbon (C) reducing process) is present the method for extensive use, the inventor thinks: in theory also have full carbon (C) reducing process and mix reducing process.Scheme 1 is to generate CO earlier, and CO participates in reduction reaction; The scheme 2 of inventor's design is that carbon (C) is participated in reduction reaction directly, and mixing reducing process is that C and CO participate in reduction reaction simultaneously, and is too complicated because of chemical reaction, will not discuss.Only with regard to iron, chemical reaction is as follows:
1: half former also method scheme 2 of carbon of scheme: full carbon reduction method
Chemical equation is: chemical equation is:
2C+O
2＝2CO (1) 6Fe
2O
3+C＝4Fe
3O
4+CO
2 (1)
3Fe
2O
3+CO＝2Fe
3O
4+CO
2 (2) 2FeO+C＝2Fe+CO
2 (2)
Fe
3O
4+CO＝3FeO+CO
2 (3) CO
2+CaO＝CaCO
3 (3)
FeO+CO＝Fe+CO
2 (4)
CO
2+CaO＝CaCO
3 (5)
Outwardly, full carbon reduction method and half carbon reduction method in theory all are feasible, and just the chemical reaction step of half carbon reduction method is more than full carbon reduction method, and half carbon reduction method is difficult to operation in practice, and key is first step reaction, how to control O
2Tolerance is only permitted carbon (C) and is generated CO, and do not generate CO
2, sense of propriety is difficult to hold; In addition, half carbon reduction method totally consumes the carbon amount greater than full carbon reduction method, and cost must enter into consideration in industrial production.Therefore, this patent selection scheme 2, promptly full carbon (C) reducing process.
Calculate anthracite (C content＞80%) and CaO consumption according to scheme 2 reaction equations, mine tailing, coal and calcium oxide all are milled to-200 orders, mix that (someone claims stove at the reduction roasting kiln, also the someone claims calcining kiln) in carry out, 1100 ℃～1150 ℃ of sintering temperatures, roasting time 25～30min, iron is reclaimed by magnetic separation in the cooling back.
Heavy metal reclaim and in, the trace element activation
From tail gas, reclaim heavy metal Hg, Pb, Cd, Cr, As, because under reducing condition, As
2O
3Be reduced to As by C, As is 615 ℃ of distillations; Cr
2O
3Have magnetic, can reclaim simultaneously when magnetic separation iron, the boiling point of Hg is 356.9 ℃, and the boiling point of Cd is 767 ℃, and under hot conditions, Pb is also volatile; In, trace element is through calcination activation, is converted into solubility in citric acid available state compound.
(patent application of April 26 submitting to referring to Zhang Fudao .2010 201010155263.1)
Two, the mine tailing after the harmless treatment is as the essential condition of cultivation matrix
1. valuable element (or component) reclaims again.
2. remove poisonous, harmful substance: comprise poisonous, harmful ore dressing interpolation medicament, cyanide, sodium salts etc. must not contain cyanide and poisonous, harmful organic compound.
3. it is the stable state compound that the residue after heavy metal Hg, Pb, Cr, Cd, As reclaim needs passivation.Its content meets " the agricultural shale of urban wastewater treatment firm Treatment of Sludge " (CJJ309-2009) standard:
Total cadmium (mg/kg butt): A level＜3, B level＜15; Total mercury (mg/kg butt): A level＜3, B level＜15; Total plumbous (mg/kg butt): A level＜300, B level＜1000; Total chromium (mg/kg butt): A level＜500, B level＜1000; Total arsenic (mg/kg butt): A level＜30, B level＜75.
4. sodium salt＜0.1%.
5. the seed sprouting index is greater than 90%.
6.SiO
2Content＜35%.
7. in, trace element must activate and be the available state compound.
8. the requirement of acid-base value: pH value 6.5～7.5.
9. the requirement of mine tailing granularity: 200～300 orders.
Three, the mine tailing after innoxious is as the method for booth vegetable matrix
Booth vegetable (claiming facilities vegetable again) is owing to the continuous cropping plantation produces continuous cropping obstacle, except soil salt increases, outside soil physical and chemical property changes, its main cause is that the soil organisms population structure changes, wherein, microbiotic fungal population changes maximum, and Pseudomonas rolls up cause of disease; In soil fauna, and Turbatrix variation maximum (work such as Zhang Fudao, Chinese soil is biological to be developed and safety evaluation, P.120-141, Chinese agriculture publishing house, 2006.9, Beijing).The most frequently used method one is soil disinfection, the 2nd, and soil removal and replacement, in recent years, substrate culture is adopted in big cities such as Beijing.Inorganic cultivation matrix commonly used is: rock wool, river sand, chad, vermiculite, perlite, expanded ceramsite, slag etc.; Organic culture substrate commonly used is: the peat composed of rotten mosses, and peat (content of organic matter is greater than 40%), reed, sawdust, bagasse, rice husk, mushroom slag and cotton seed hulls bacterium chaff etc. are at the still peat composed of rotten mosses and the peat of big or middle city suburbs consumption maximum.China has signed the La Musaier pact, should not exploit the peat composed of rotten mosses and peat in a large number, utilizes mine tailing after innoxious as cultivation matrix, not only can replace the peat composed of rotten mosses and peat, in also can replacing, the chemicals of trace element.For safety, had better not plant leaf vegetables, can plant solanberry class, gourd vegetables.
1. the proportioning of cultivation matrix (in butt):
(1) matrix of nutrient fluid drip irrigation planting patterns is formed
Innoxious mine tailing up to standard (crossing 300 mesh sieve holes): 70%～80%;
Silt loam: 20%～30%;
PH value: 6.5～7.0.
(2) full nutrient matrix-water droplet is irritated the matrix composition of planting patterns
Innoxious mine tailing up to standard (crossing 300 mesh sieve holes): 25%～30%;
The feces of livestock and poultry that fermentation maturity is up to standard: 10%～15%;
The special-purpose slow/controlled release fertilizer of vegetables (N: P
2O
5: K
2O=1: 0.4～0.5: 1.2～1.5): 65%～55%.It should be noted that, add feces of livestock and poultry, the one, in order to increase clay level constituent content, the 2nd, microbe inoculation, down with;
PH value: 6.5～7.0.
2. planting patterns
(1) slot type plantation: groove depth 25～30cm, groove width 20cm after groove digs, lays plastic film (groove behind the 1d that dries in the air
Lay entirely on the end and groove both sides), matrix is put into groove, transplant vegetable seedling, open droping irrigating pipe afterwards, the beginning drip irrigation.
(2) pocket type plantation: matrix is put into plastic sack, put into the above-mentioned groove of not laying plastic film behind the tying, transplant two strain vegetables, drip irrigations then for every bag.
Four, the metal tailings after innoxious is as the method for Turf Culture matrix
At present urban greening is to be cost to sacrifice a large amount of arable lands with the lawn, and turf of every plantation is then peeled off 1/4～1/3 of soil plough horizon, plants 3～4 times, and topsoil soils all is handled upside down, thereby no longer cultivated.Can use the mine tailing after innoxious to replace the soil species turfing.
1. compounded turf matrix is formed (in butt)
Innoxious mine tailing up to standard (crossing 200 mesh sieve holes): 50%～55%;
The domestic sludge that fermentation maturity is up to standard: 50%～45%;
PH value: nonacid soil region, 6.5～7.0; The acid ground area, 7.0～7.5.
2. kind method for planting
On the threshing ground or idle dead level (need ground is evened out), lay plastic film, wide 2～the 3m of every furrow, there is the aisle on length visual field ground and deciding between furrow, above-mentioned matrix blending is even, pave on plastic film thickness 8～10cm, water content 25%～27%, spread grass-seed after floating, spread above and cover a bed thickness 0.5～1cm fine earth.Be noted that to sprinkle water with water sprager in the back of emerging, moistening getting final product do not need fertilising, and the nutrient in the domestic sludge just can satisfy the needs before turf is sold.
Advantage of the present invention:
1 metal tailings is used as cultivation matrix after reclaiming valuable element (component) and harmless treatment, and not only consumption is big, and the alternative peat composed of rotten mosses, peat and arable soil, protects farmland.
2, in the mine tailing activation after in, the trace element alternative in, the trace element chemicals, be comprehensive utilization of waste materials, can realize energy-saving and emission-reduction again.
Claims (1)
- After an iron tailings, alum clay mine tailing, molybdenum mine tailing, Pb-Zn tailings, nickel mine tailing, copper mine tailing, manganese mine tailing, tungsten mine tailing, tailing, 10 kinds of metal tailings harmless treatments of golden mine tailing as the method for cultivation matrix, it is characterized in that its raw material proportioning is as follows as solanberry class, gourd vegetables greenhouse cultivation matrix and turf plantation matrix:(1) solanberry class, gourd vegetables greenhouse cultivation matrix: the matrix of nutrient fluid drip irrigation planting patterns is formed, and by butt, innoxious up to standard and be milled to 300 order mine tailings and account for 70%～80%, silt loam accounts for 30%～20%; Full nutrient matrix-water droplet is irritated the matrix of planting patterns and is formed, and by butt, innoxious up to standard and be milled to 300 order mine tailings and account for 25%～30%, fermentation maturity feces of livestock and poultry up to standard accounts for 10%～15%, N: P 2O 5: K 2O=1: 0.4～0.5: the special-purpose slowly/controlled releasing fertilizer of 1.2～1.5 vegetables accounts for 65%～55%; The pH value of two kinds of cultivation matrixes is 6.5～7.0;(2) compounded turf matrix: by butt, innoxious up to standard and be milled to 200 purpose mine tailings and account for 50%～55%, fermentation maturity domestic sludge up to standard accounts for 50%～45%, uses at nonacid soil region, and the pH value of matrix is 6.5～7.0; Use in the acid ground area, the pH value of matrix is 7.0～7.5.
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| CN107586224A (en) * | 2017-09-08 | 2018-01-16 | 大连青松智慧生态科技有限公司 | A kind of sludge and alkaline residue mixed method |
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