CN104099100A - Soil conditioner and preparation method thereof - Google Patents
Soil conditioner and preparation method thereof Download PDFInfo
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- CN104099100A CN104099100A CN201410288820.5A CN201410288820A CN104099100A CN 104099100 A CN104099100 A CN 104099100A CN 201410288820 A CN201410288820 A CN 201410288820A CN 104099100 A CN104099100 A CN 104099100A
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Abstract
The invention relates to a soil conditioner and a preparation method thereof. The soil conditioner is prepared through the following steps: crushing and sieving reverse flotation phosphorus mineral tailings calcinated at the temperature of 800-1200 DEG C and obtaining active phosphorus mineral tailings with particle diameters less than or equal to 50 mesh obtained through autoclaving curing processing, namely, obtaining the soil conditioner; the preparation method comprises the following steps: the reverse flotation phosphorus mineral tailings are calcinated at the temperature of 800-1200 DEG C and then crushed and sieved; then the crushed and sieved reverse flotation phosphorus mineral tailings are subjected to autoclaving curing under the condition of 170-180 DEG C, 0.8-1.0 MPa for 3-5 h to obtain the soil conditioner. The soil conditioner prepared by the invention has the advantages that the fertilizing value is high and the soil conditioner can be used in mine reclamation and soil amelioration in phosphorus deficient areas and has wider application prospect and avoids secondary pollution.
Description
Technical field
The invention belongs to soil improvement and solid waste reutilization technology field, relate to a kind of soil improvement agent and preparation method thereof.
Background technology
< < " 12 " the planning outline > > putting into effect in March, 2012 classifies energy-conserving and environment-protective first of seven great strategy new industries as.Wherein, soil remediation is the row of giving priority in environmental protection industry, and clearly proposes need to strengthen Soil Pollution Control supervision and management.Present stage, the method for soil restoration was broadly divided into physics, chemistry and biological three classes, was subdivided into following several: 1. thermodynamics reparation, 2. thermal desorption reparation, 3. burning method, 4. land fill, 5. chemical leaching, 6. composting process, 7. phytoremediation, 8. permeable reactive wall, 9 biological restoration.Wherein phytoremediation is to use agrotechnique as added soil improvement agent, improve the restricted condition of soil to the disadvantageous chemistry of plant-growth and physics aspect, make it to be suitable for plantation, and by planting preferred plant and rhizospheric microorganism thereof, directly or indirectly absorb, volatilize, separated, degradation of contaminant, restoration and reconstruction natural ecological environment and vegetation landscape.The effect of soil improvement agent improvement soil is very obvious, and purposes is also very many.
The raw material of preparing soil improvement agent is very many, mainly contains: natural mineral matter, as rhombspar, gypsum, ground phosphate rock, zeolite, montmorillonite powder, calcium silicate powder, olive stone flour, sulphur powder, lime or limestone powder, boron ore powder and zinc ore powder, peat; Agricultural wastes, as feces of livestock and poultry, crop material etc.; Industry byproduct, as alkaline cinder, blast furnace slag, flyash, coal gangue, Yellow Phosphorous Slag powder, bean dregs (SM), sewage sludge etc.; Organic fertilizer, as hog manure, leguminous green manure etc.; City and domestic refuse, as organic waste (swill, biosolids), building waste and life slag and other domestic refuses etc.; Biomass, as biomass class plant (high oil corn, Chinese sorghum etc.) of weeds, artificial growth etc.; Artificial polymkeric substance, as Polymer Synthesizing material, biotechnological formulation etc.
Adopt at present soil improvement agent improvement soil also to have following problem: (1) cost is high.Although the product of commensurability's research and development is not a lot, because cost is high (600～1800 yuan/m
2), it is applied always and be restricted; (2) research and development raw material is single, and causes quality product, effect, unstable properties because of Technology problem.Raw material focuses mostly in natural and synthetic material, few to the exploitation of domestic refuse, biomass and trade waste, causes the soil improvement starting material of a large amount of cheapnesss to put aside as useless, and contaminated soil and water body etc.In view of above problem, need badly and find a kind of easy, economic phytoremediation type soil improvement agent, to solve the reparation problem of barren or contaminatedground.
Phosphorus mine tailing is the byproduct of phosphate rock resource exploitation, be after mining, discharge do not made full use of waste material.The a large amount of phosphorus mine tailing of the annual generation of China's phosphate Industry is fine sand shape and is deposited in Tailings Dam.Not only expend fund, and cause series of environmental problems.China's reverse flotation phosphorus mine tailing existence form is mainly rhombspar (CaMgCO
3), wherein content of magnesia is generally in 17% left and right, and contains a certain amount of P
2o
5, mineral grain is thin, and mine tailing granularity is generally all below 200 orders.In most regional phosphorus mine tailings, the highest component and the content thereof of content is about: calcium oxide 34.11%, magnesium oxide 17.65%, Vanadium Pentoxide in FLAKES 5.30%, magnesium is mainly composed and is deposited with the form of rhombspar, and have on a small quantity and exist with phosphoric acid salt, silicate form, its in each phase proportion be respectively 99.80%, 0.10%, 0.10%; Phosphorus is mainly composed and is deposited (accounting for 97.08%) with the form of phosphatic rock, and has on a small quantity with ferriferous oxide (1.04%), monazite (0.19%), the existence of xenotime (1.83%) form; Calcium is mainly composed and is deposited (accounting for 96.95%) with the form of rhombspar, and has on a small quantity with calcite (1.11%), the existence of phosphoric acid salt (1.94%) form.
The domestic and international research and development about phosphorus mine tailing are at present mainly utilize phosphorus mine tailing to prepare some gas concrete and extract the utilizable material in phosphorus mine tailing.Mainly contain: (1) utilizes phosphorus mine tailing to prepare gas concrete; (2) produce mine tailing fertilizer; (3) make concrete aggregate and produce ordinary Portland cement; (4) magnesium in extraction phosphorus mine tailing, rare earth element etc.
Utilize phosphorus mine tailing can make full use of phosphorus resource of tailings as raw material production soil improvement agent, the disclosure of the invention that for example number of patent application is 201310001658.X a kind of method of utilizing phosphorus mine tailing and acid waste water to prepare phosphate fertilizer soil improvement agent, comprise the steps: that (1) prepare P
2o
5the phosphorus mine tailing ore pulp of content 10%～18% is as raw material; (2) preparing containing mass concentration is the acid waste water of 5%～10% sulfuric acid; (3) in phosphorus mine tailing ore pulp, add acid waste water, acid waste water and phosphorus mine tailing ore pulp are mixed 10～15 minutes, form mixed slurry, the tailings water pH value that is adjusted to mixed slurry eliminating is greater than 6.8; (4) by the mixed slurry of discharging tailings water through 6～12 months store up; (5) obtain the soil improvement agent with fused(calcium magnesium)phosphate effect that water content mass concentration is less than 10% after storing up, wherein active P
2o
5content is 7%～14%.This invention can realize the recycling of phosphorous magnesium phosphorus mine tailing and acid waste water, and the phosphorus major part in phosphorus mine tailing is converted into active P
2o
5, and the soil improvement agent that contains calcium and magnesium.But the method need to be carried out 6～12 months storing up to mixed slurry, not only consuming time, and large to the requirement in place, and the tailings water of discharge causes secondary pollution to environment.
Summary of the invention
Technical problem to be solved by this invention is for above shortcomings in prior art, a kind of soil improvement agent and preparation method thereof is provided, this soil improvement agent is usingd reverse flotation phosphorus mine tailing as main raw material, can not only consume in a large number and utilize phosphorus mine tailing, and preparation technology is simply efficient, environmentally friendly, can fully utilize phosphate rock resource.
The technical scheme of soil improvement agent of the present invention is:
Comprise that reverse flotation phosphorus mine tailing is through 800～1200 ℃ of calcinings, crushing and screening, then get particle diameter≤50 order particle (suitable with soil particle used) and carry out the active phosphorus mine tailing that steam press maintenance processing obtains, i.e. soil improvement agent.
Press such scheme, described calcining temperature is 850～950 ℃, calcination time >=1 hour.
Press such scheme, described steam press maintenance is steam press maintenance 3～5 hours under 170～180 ℃, 0.8～1.0MPa condition.
In order to improve the performance of soil improvement agent of the present invention, also can when reverse flotation phosphorus mine tailing steam press maintenance, add other components as silicon ash etc.
Further, above-mentioned soil improvement agent also comprises silicon ash, 15% of interpolation quality≤active phosphorus mine tailing quality of silicon ash.
Further, above-mentioned soil improvement agent also comprises soil, 84 times of the quality of described soil≤described active phosphorus mine tailing quality.Described soil can be gardens soil, vegetable mould or both mixtures, can certainly use the soil on required improvement ground as raw material.
Further, above-mentioned soil improvement agent also comprises phosphogypsum and phosphorus slag, 11 times of the quality of described phosphogypsum≤described active phosphorus mine tailing quality, 4.5 times of the quality of described phosphorus slag≤described active phosphorus mine tailing quality.
Further, above-mentioned soil improvement agent also comprises perlite, 3 times of described perlitic quality≤described active phosphorus mine tailing quality.
In addition, in order to improve the fertility of above-mentioned soil improvement agent, can also add therein appropriate fertilizer.
The preparation method of soil improvement agent of the present invention comprises the following steps:
(1) calcining: reverse flotation phosphorus mine tailing is calcined at 800～1200 ℃;
(2) crushing and screening steam press maintenance: the material after calcining is broken, and get≤50 object particles carry out steam press maintenance and obtain soil improvement agent.
Preferably, described calcining temperature is 850～950 ℃, calcination time >=1 hour.
Preferably, described steam press maintenance is steam press maintenance 3～5 hours under 170～180 ℃, 0.8～1.0MPa condition.
In order to improve the performance of soil improvement agent of the present invention, also can when reverse flotation phosphorus mine tailing steam press maintenance, add other components as silicon ash etc.
Further, described soil improvement agent also comprises silicon ash, 15% of interpolation quality≤active phosphorus mine tailing quality of silicon ash.
Further, described soil improvement agent also comprises soil, 84 times of the quality of described soil≤described active phosphorus mine tailing quality.
Further, described soil improvement agent also comprises phosphogypsum and phosphorus slag, 11 times of the quality of described phosphogypsum≤described active phosphorus mine tailing quality, 4.5 times of the quality of described phosphorus slag≤described active phosphorus mine tailing quality.
Further, described soil improvement agent also comprises perlite, 3 times of described perlitic quality≤described active phosphorus mine tailing quality.
In order to strengthen reclamation result, also can add water that soil improvement agent is stirred, the interpolation quality of water is 20～25% of soil improvement agent quality.Add the old homogenizing reaction that water wet mixing is conducive to various materials, build up fertility.Further, after wet mixing, old homogenizing time >=7 day are more conducive to improve the activity of phosphorus component in soil improvement agent, make it to be more easily absorbed by plants, and then improve reclamation result.
When using soil improvement agent provided by the invention, only need to be laid on the soil surface that needs improvement.
Beneficial effect of the present invention is: 1, soil improvement agent of the present invention is can utilize in a large number flotation phosphate mine tailing, there is low cost, environmental protection, but also can in a large number, integrally consume the phosphorus Industry Waste Solid things such as reverse flotation phosphorus mine tailing, phosphorus slag and phosphogypsum; 2, soil improvement agent using method of the present invention is simple, directly soil improvement agent is laid on to contaminated or poor soil the earth's surface, does not need workmen to carry out technical director, can save a large amount of human costs; 3, simple, the mild condition, with low cost of soil improvement agent preparation technology of the present invention, and can not cause secondary pollution in preparation process, be easy to realize, easy to utilize.
Accompanying drawing explanation
Fig. 1 is the XRD diffractogram of the embodiment of the present invention 1 reverse flotation phosphorus used mine tailing;
Fig. 2 is the XRD diffractogram of the rear prepared active phosphorus mine tailing of embodiment 1 reverse flotation phosphorus mine tailing calcining;
Fig. 3 is the process flow sheet that embodiment 1 prepares soil improvement agent.
Embodiment
For making those skilled in the art understand better technical scheme of the present invention, below in conjunction with accompanying drawing, the present invention is described in further detail.
Embodiment of the present invention reverse flotation phosphorus used mine tailing is taken from phosphatization group Jinning County, Yunnan phosphorus ore wheatland tailing dam, and its XRD diffracting spectrum can be participated in accompanying drawing 1; Phosphorus slag is taken from Yunnan phosphatization group Jinning County's Yellow Phosphorous Plant and is produced the phosphorus slag that yellow phosphorus produces; Phosphogypsum used is taken from Yunnan phosphatization group Jinning County's phosphorus ore.More than explanation, only for only the source of phosphorus mine tailing, phosphorus slag and phosphogypsum is described, does not form the restriction to the present invention, and this type of phosphorus ore waste material in other area also can be realized the present invention.
Embodiment 1
Reverse flotation phosphorus mine tailing is calcined and within 1.5 hours, obtained calcinate at 900 ℃, and the XRD diffractogram of reverse flotation phosphorus mine tailing is shown in accompanying drawing 1.Known from accompanying drawing 1, magnesium calcium carbonate and calcium monofluorophosphate contained in reverse flotation phosphorus mine tailing are all the materials that is difficult for reacting, and now contained silicon-dioxide is nonactive silicon-dioxide, also can not participate in reaction; After certain high-temperature calcination (after calcining, the XRD diffractogram of prepared active phosphorus mine tailing is referring to accompanying drawing 2), above-mentioned substance is converted into calcium oxide, magnesium oxide, calcium carbonate, silicon-dioxide and calcium monofluorophosphate etc., can react with other materials, to produce desired substance; By the material steam press maintenance after calcining, can accelerating oxidation calcium, silicon oxide etc. and silicon-dioxide accelerated reaction, reduce the alkalescence of steam-cured thing, make it to be applicable to as soil improvement agent.
Therefore we are known calcines reverse flotation phosphorus mine tailing with steam press maintenance and processes the active phosphorus mine tailing that can obtain having soil improvement action, and it can be used as soil improvement agent, is layed in lean soil, has certain reclamation result.
Steam press maintenance obtains soil improvement agent for 4 hours for steam press maintenance under 175 ℃, 0.9MPa condition in the present embodiment.
Embodiment 2-5
By the introduction of embodiment 1, we are known calcines reverse flotation phosphorus mine tailing with steam press maintenance and processes and can obtain soil improvement agent, but prepared like this soil improvement agent is poor property particle, need in actual use to wait it under operation of nature, to decompose, merge competence exertion effect with soil, onset time is long, poor effect, the invention provides embodiment 2-5 for this reason, by wherein adding soil raw material, improve soil improvement agent, the soil improvement agent of making after active phosphorus mine tailing and mixing with soil, can merge with lean soil better, can allow soil improvement agent bring into play faster effect.
In order to describe gradual change, in the following description for phosphorus mine tailing without all referring to reverse flotation phosphorus mine tailing in specified otherwise situation.
Table 1
| Numbering | Active phosphorus mine tailing (mass fraction) | Soil (mass fraction) |
| 2 | 1 | 84 |
| 3 | 20 | 65 |
| 4 | 50 | 35 |
| 5 | 80 | 5 |
Table 1 is the mass fraction proportioning of active phosphorus mine tailing and soil in embodiment 2～5, wherein active phosphorus mine tailing is that reverse flotation phosphorus mine tailing is calcined >=1 hour at 800～1200 ℃, through crushing and screening, process again, get≤50 object particles carry out obtaining active phosphorus mine tailing after steam press maintenance processing, and steam press maintenance is steam press maintenance 3～5 hours under 170～180 ℃, 0.8～1.0MPa condition.
In order to increase the activity of active phosphorus mine tailing, when steam press maintenance, be added with silicon ash, the addition of common above-mentioned silicon ash is less than or equal to 15% of active phosphorus mine tailing quality, and in embodiment 2～5, the addition of silicon ash is 11～15% of active phosphorus mine tailing quality.Need in addition explanation except silicon ash, diatomite also can play same effect, silicon ash and diatomite can certainly be mixed to use.
It is in order to reduce the content of calcium oxide, magnesium oxide, calcium carbonate, silica component that crushing and screening is processed, and improves phosphorus content, and reduces basic component content.In the present embodiment, the soil of selecting is gardens soil and mixture humous, and wherein gardens soil is 4:1 with mass ratio humous.Here need explanation to there is no harsh restriction for the selection of soil, but it is good to be preferably water retention property, the soil that fertilizer is high, in actual production, soil can be gathered materials on the spot.In addition, the particle diameter of soil is preferably 1～3mm, can better merge with active phosphorus mine tailing (grain diameter approaches) like this, both are preferably wet mixing at mixing, because after wet mixing, homo-effect is better, and has moisture to exist, can allow the phosphorus in active phosphorus mine tailing bring into play faster effect, allow soil improvement agent bring into play faster effect.In above embodiment, the old time of homogenizing is 7 days, certainly can the old time of proper extension homogenizing in order to obtain better result of use.
In addition, on embodiment 1 basis, can also add one or more in phosphogypsum, phosphorus slag, perlite, fertilizer and prepare soil improvement agent, wherein phosphogypsum and phosphorus slag add the content that can increase phosphorus in soil improvement agent, and can be by the solid waste comprehensive utilization of phosphor resource; Perlite Main Function is the water retention property that increases soil improvement agent; Fertilizer is in order to increase soil fertility, and can need improve soil demand according to different zones, selects different fertilizer.
Embodiment 6-30
Embodiment 6-30 is the preferred embodiment of the present invention, and the process flow sheet of its preparation method can be with reference to accompanying drawing 3.
Executing the mass ratio of soil and active phosphorus mine tailing in example 6～10 is 84:1, and each component proportion is in Table 2.
Table 2
In embodiment 6～10, the step of preparing above-mentioned soil improvement agent is as follows:
The active phosphorus mine tailing preparation method wherein providing in active phosphorus mine tailing preparation method and embodiment 2-5 is basic identical.Be about to reverse flotation phosphorus mine tailing and at 800 ℃, calcine 3 hours, then process through crushing and screening, get≤50 object particles carry out obtaining active phosphorus mine tailing after steam press maintenance processing, and steam press maintenance is steam press maintenance 3～5 hours under 170～180 ℃, 0.8～1.0MPa condition; When steam press maintenance, be added with silicon ash, the consumption of silicon ash sees the above table 2.Wherein soil improvement agent is divided into again base material and the water of dryness, and base material comprises active phosphorus mine tailing, soil, phosphogypsum, phosphorus slag, perlite, fertilizer, silicon ash etc.
(stirring 3～5min) stirs after subsequently active phosphorus mine tailing being mixed with phosphogypsum, phosphorus slag, and then add soil, perlite and fertilizer, (stirring 3～5min) stirs, finally add load weighted water, (stirring 5～10min) stirs, again by gained material ageing 7 days, obtain take the soil improvement agent that active phosphorus mine tailing and soil are main raw material.Here fertilizer is chosen as common agriculture composite fertilizer, in actual production process, can select different fertilizer according to required improvement soil fertility situation, can select the composite fertilizer of without phosphorus or few phosphorus.And fertilizer addition is also without strict restriction.
Phosphorus slag and phosphogypsum are as the useless solid thing of phosphorus industry, wherein the component in contained component and active phosphorus mine tailing can generate the effective constituent in soil improvement agent under weathering hydrolysising condition, improve soil improvement agent improved effect, perlite plays water retention, and fertilizer is used the initial stage to provide nutrient to plant at soil improvement agent, effective constituent in later stage soil improvement agent is brought into play.
In embodiment 11～15, the amount ratio of soil and active phosphorus mine tailing is 3:2, and each component proportion is in Table 3.
Table 3
Its preparation method is basic, and as embodiment 6, difference is that the calcining temperature of phosphorus mine tailing is 950 ℃, and calcination time is 1.5 hours.
In embodiment 16～20, the amount ratio of soil and active phosphorus mine tailing is 9:8, and each component proportion is in Table 4.
Table 4
In embodiment 16～20, the step of preparing above-mentioned soil improvement agent is substantially the same manner as Example 6, and difference is that the calcining temperature of phosphorus mine tailing changes 1000 ℃ into, and calcination time is 1.5 hours.
In embodiment 21～25, the amount ratio of soil and active phosphorus mine tailing is 5:12, and each component proportion is in Table 5.
In embodiment 21～25, the step of preparing above-mentioned soil improvement agent is substantially the same manner as Example 16.
Table 5
In embodiment 26～30, the amount ratio of soil and active phosphorus mine tailing is 1:16, and each component is joined in Table 6.
Table 6
In embodiment 26～30, the step of preparing above-mentioned soil improvement agent is substantially the same manner as Example 16, and difference is that the calcining temperature of phosphorus mine tailing changes 1200 ℃ into, and calcination time is 1 hour.
The soil improvement agent preparing of embodiment 6～30 is carried out to planting experiment, by the percentage of germination of its water-intake rate, water retention, plant and the upgrowth situation of plant, characterize the effectiveness of different ingredients soil improvement agent.
Test result shows that above-described embodiment soil improvement agent water-intake rate is 50～80%, water retention 47～76%, and percentage of germination is 51.3～83.2%, above index all meets the demand of plant-growth after soil improvement.
Measured the pH value of soil improvement agent, its pH value, between 6.5～9.4, meets the growth demand of plant simultaneously.
Choose embodiment 6,11,21,25,26 its available phosphorus contents of test, available phosphorus content of soil improvement agent planting plants pre-test, surveyed an available phosphorus content every 7 days after plantation.Available phosphorus content is in P2O5, and the available phosphorus in base material (P) content (mg/kg) is calculated as follows:
In formula:
W
p---available phosphorus amount, mg/kg;
C---from working curve, check in available phosphorus amount, μ g;
T---divide and get multiple (overall solution volume 50mL/ draw solution volume);
M---air-dry quality of soil sample, g;
K---air-dry soil sample is converted into the moisture reduction factor of drying soil sample.
The air-dry soil sample 5.0000g (being accurate to 0.0001g) taking by 2mm sieve aperture is placed in 200mL Erlenmeyer flask, adds 25mL hydrochloric acid-sulfuric acid digestion agent, jumps a queue, and is placed on the 5min that vibrates on vibrating machine.With filter paper filtering at a slow speed, in 50mL volumetric flask, wash with water, then be diluted with water to scale, shake up.Do blank test simultaneously.As filtrate has color, can add a small amount of without phosphorus gac and do decolouring processing.
Draw 2.00mL～10.00mL solution and be placed in 50mL volumetric flask, add water to 15mL～20mL, add 1 p-nitrophenol indicator, extremely yellow with 2mol/L sodium hydroxide solution regulator solution, use again 0.5mol/L sulphuric acid soln regulator solution to micro-yellow, add the anti-developer of 5mL molybdenum antimony, be diluted with water to scale, shake up.Place after 30min, on spectrophotometer, in 700nm wavelength place, with 1cm～2cm absorption vessel, measure absorbancy, from working curve, check in corresponding phosphorus amount.
Get respectively 0,5,10,15,20,25,30 μ g phosphorus standardized solution and be placed in 50mL volumetric flask, by the operation of aforesaid operations step, drawing curve.
Test result is as shown in table 7:
Table 7
As can be seen from the table, increase along with implantation time, the content of available phosphorus also can increase slowly, and plant can absorb phosphorus and cause consumption in process of growth, so the humic acid that known plant secretes in process of growth impels the calcium monofluorophosphate in phosphorus mine tailing to decompose, because plant secretion humic acid is process slowly, the available phosphorus content in sample can slowly increase, so such scheme can make the phosphorus in phosphorus mine tailing be fully used again.In addition, we also can find out, the rate of increase of available phosphorus content is along with active phosphorus mine tailing accounts for the growth of soil improvement agent mass fraction and increases, so its application is obvious to the effect of soil improvement.In addition, here need explanation a bit, along with active phosphorus mine tailing consumption increases, the alkalescence of soil improvement agent can strengthen, this is processed screening after the calcining of phosphorus mine tailing, get≤50 order particles carry out steam press maintenance can alleviate above problem, and sieves tailing over or good material of construction of obtaining, and can further recycle.
Know-why of the present invention has below been described in conjunction with specific embodiments.These are described is in order to explain principle of the present invention, and can not be interpreted as by any way limiting the scope of the invention.Explanation based on herein, those skilled in the art does not need to pay performing creative labour can associate other embodiment of the present invention, within these modes all will fall into protection scope of the present invention.
Claims (13)
1. a soil improvement agent, is characterized in that comprising that reverse flotation phosphorus mine tailing is through 800～1200 ℃ of calcinings, crushing and screening, then gets particle diameter≤50 order particle and carries out the active phosphorus mine tailing that steam press maintenance processing obtains, i.e. soil improvement agent.
2. soil improvement agent according to claim 1, is characterized in that described calcining temperature is 850～950 ℃, calcination time >=1 hour.
3. soil improvement agent according to claim 1 and 2, is characterized in that described steam press maintenance was for steam press maintenance under 170～180 ℃, 0.8～1.0MPa condition 3～5 hours.
4. soil improvement agent according to claim 3, characterized by further comprising silicon ash, 15% of interpolation quality≤active phosphorus mine tailing quality of silicon ash.
5. soil improvement agent according to claim 3, characterized by further comprising soil, 84 times of the quality of described soil≤described active phosphorus mine tailing quality.
6. soil improvement agent according to claim 3, characterized by further comprising phosphogypsum and phosphorus slag, 11 times of the quality of described phosphogypsum≤described active phosphorus mine tailing quality, 4.5 times of the quality of described phosphorus slag≤described active phosphorus mine tailing quality.
7. soil improvement agent according to claim 3, characterized by further comprising perlite, 3 times of described perlitic quality≤described active phosphorus mine tailing quality.
8. a preparation method for soil improvement agent, is characterized in that comprising the following steps:
(1) calcining: reverse flotation phosphorus mine tailing is calcined at 800～1200 ℃;
(2) crushing and screening steam press maintenance: the material after calcining is broken, and get≤50 object particles carry out steam press maintenance and obtain soil improvement agent.
9. the preparation method of soil improvement agent according to claim 8, is characterized in that described calcining temperature is 850～950 ℃, calcination time >=1 hour;
Described steam press maintenance is steam press maintenance 3～5 hours under 170～180 ℃, 0.8～1.0MPa condition.
10. the preparation method of soil improvement agent according to claim 8, is characterized in that described soil improvement agent also comprises silicon ash, 15% of interpolation quality≤active phosphorus mine tailing quality of silicon ash.
The preparation method of 11. soil improvement agents according to claim 8, is characterized in that described soil improvement agent also comprises soil, 84 times of the quality of described soil≤described active phosphorus mine tailing quality.
The preparation method of 12. soil improvement agents according to claim 8, it is characterized in that described soil improvement agent also comprises phosphogypsum and phosphorus slag, 11 times of the quality of described phosphogypsum≤described active phosphorus mine tailing quality, 4.5 times of the quality of described phosphorus slag≤described active phosphorus mine tailing quality.
The preparation method of 13. soil improvement agents according to claim 8, is characterized in that described soil improvement agent also comprises perlite, 3 times of described perlitic quality≤described active phosphorus mine tailing quality.
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| CN110684536A (en) * | 2018-07-06 | 2020-01-14 | 中化重庆涪陵化工有限公司 | Phosphogypsum micron soil conditioner and preparation method thereof |
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| CN116535143A (en) * | 2023-05-08 | 2023-08-04 | 湖北宜化磷石膏科技开发有限公司 | Method for producing lime profile by using flotation phosphate tailings |
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