CN101747091B - Method for preparing calcium magnesium phosphate fertilizer by using phosphorite floatation tailing as raw material - Google Patents

Method for preparing calcium magnesium phosphate fertilizer by using phosphorite floatation tailing as raw material Download PDF

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CN101747091B
CN101747091B CN 200910218354 CN200910218354A CN101747091B CN 101747091 B CN101747091 B CN 101747091B CN 200910218354 CN200910218354 CN 200910218354 CN 200910218354 A CN200910218354 A CN 200910218354A CN 101747091 B CN101747091 B CN 101747091B
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phosphate
raw material
calcium magnesium
fused
cyclone furnace
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CN101747091A (en
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赵建国
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Yunnan Chemical Research Institute
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Yunnan Chemical Research Institute
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Abstract

The invention relates to a method for preparing calcium magnesium phosphate fertilizer through cyclone furnace process by using phosphorite floatation tailings as raw materials, in particular to a method for preparing calcium magnesium phosphate fertilizer through adopting a cyclone furnace by using phosphorite floatation tailings as main raw materials, belonging to the technical field of phosphate fertilizer chemical industry. The method uses the phosphorite floatation tailings as the main raw materials and adopts the cyclone furnace to prepare calcium magnesium phosphate fertilizer, and comprises the following steps: (1) the phosphorite floatation tailings are used as the raw materials, pulp dry basis contains 8-12 percent of P2O5 by weight percent, tailing filter cakes are obtained through treatment and the tailing filter cakes contain 20-40 percent of water; (2) the tailing filter cakes obtained through the step (1) are dried to tailing power containing water less than 2 percent by using a dryer, and the required grain size of tailing powder is that more than 80 percent of particles can pass through a 100-mesh sieve; (3) other primary phosphorite, coal, serpentine stone and silica to be jointly calcined are metered, mixed, cracked and crushed into joint-calcination mixed powder with fineness that more than 80 percent of particles can pass through the 100-mesh sieve; (4) 100 parts of phosphorite raw material, 190-280 parts of pulverized coal, 0-10 parts of silica and 0-20 parts of serpentine stone powder are added in the cyclone furnace by weight; and (5) the calcined powder raw material obtained through the step (4) is used to prepare calcium magnesium phosphate fertilizer by adopting the cyclone furnace. The invention has the advantages that the source of the raw materials is wide and the cost is low; sulfuric acid and phosphoric acid are not consumed, the product quality is reliable, the use is economic and feasible, and the social benefit is remarkable.

Description

A kind of take the phosphate rock floating mine tailing as raw material cyclone furnace legal system the method for standby fused(calcium magnesium)phosphate
Technical field
The invention belongs to the phosphate fertilizer chemical technology field, particularly a kind of take the phosphate rock floating mine tailing as main raw material, adopt cyclone furnace to prepare the method for fused(calcium magnesium)phosphate.
Background technology
In recent years high dense phosphoric ﹠ compound fertilizer industry is fast-developing both at home and abroad, causes the phosphorus rich ore reserves that can be directly used in phosphoric acid by wet process processing sharply to descend, and a lot of regional phosphorus abundant ore sources are closely exhausted.For guaranteeing the Sustainable development of high dense phosphoric ﹠ compound fertilizer industry, many countries are all processing the phosphorus concentrate that adopts take mid low grade phosphate rock or high-magnesium-phosphorus ore as raw material flotation production is suitable for phosphoric acid by wet process.In the process to phosphate rock floating processing, want by-product to account for the mine tailing of total amount 25-35%, and be discharged into tailing dam with the form of Tailings Slurry.A large amount of floating washed storing up of phosphorus mine tailing, not only will take a large amount of land resources, also brings the pollution to environment, and has huge potential safety hazard.Rhombspar class carbonate (CaMg (CO in (high magnesium) flotation phosphate mine tailing 3) content is generally more than 70%, W (P 2O 5) at 8-12%, belonging to the poor phosphorus ore product of high magnesium, the ore pulp water content is large, and it is had the resource utilization exploitation of economic worth purposes is global problem.
Summary of the invention
The object of the invention is to utilization and the deficiencies in the prior art for the flotation phosphate mine tailing, provide that a kind of raw material sources are wide, cost is low, do not consume sulfuric acid and phosphoric acid, reliable product quality, economically feasible, social benefit be the method for standby fused(calcium magnesium)phosphate take the phosphate rock floating mine tailing as raw material cyclone furnace legal system significantly.
Of the present invention take the phosphate rock floating mine tailing as raw material cyclone furnace legal system the method for standby fused(calcium magnesium)phosphate, take the phosphate rock floating mine tailing as main raw material, adopt the method for cyclone furnace fused(calcium magnesium)phosphate processed may further comprise the steps:
(1) take the flotation phosphate Tailings Slurry as raw material, the ore pulp butt contains P 2O 5Mass percent be 8~12%, obtain tailing cake by enrichment machine and filter processed, control tailing cake moisture 20-40%;
(2) adopt drying machine to be dried to the mine tailing material powder of moisture<2% mine tailing of piling up in step (1) tailing cake or the Tailings Dam, its granularity accounts for more than 80% for the 100 purpose particles that sieve;
(3) that other primary phosphorus ore, coal, snake mosquito stone, the silica metering that will join burning mixes is broken, be ground into fineness is that the 100 purpose particles that sieve account for and join the burning mixed powder more than 80%, and wherein the quality proportioning of each ore deposit product meets into stove and fuses raw material to the quality ratio requirement of each ore deposit product; Control is the quantity that adds of primary phosphorus ore wherein so that entering of obtaining of step (2) phosphorus mine tailing powder and its collocation the butt mass ratio of the two is 100: 12~95 in the stove phosphorus ore raw material, make into stove phosphorus ore raw material butt to contain P 2O 5Mass percent be 14~20%;
(4) add the powdery that metering mixes in the cyclone furnace and fuse raw material, the metering proportion that fuses various ore deposits product in the raw material is:
Step (3) gained powdery be mixed 100 parts of phosphorus ore raw materials, 190~280 parts of coal dusts, 0~10 part of ground silica, snake stone flour 0-20 part;
(5) powdery with step (4) gained fuses raw material, adopts cyclone furnace to prepare fused(calcium magnesium)phosphate.
The described primary phosphorus ore butt of step (3) contains P 2O 5Mass percent 〉=23%.The described coal of step (3) is bituminous coal, meager coal or coke.
The standby fused(calcium magnesium)phosphate of the described employing cyclone furnace of step (5) legal system, undertaken by following production operation step:
1. step (5) is fused raw material and air mixed sprays in the cyclone furnace, the control furnace temperature is carried out high-temperature fusion at 1350~1450 ℃, gets melt by slag discharge port;
2. with the shrend of melt water, the solid materials after the shrend is pulled out draining, drying, pulverizes, sieved, get the fused(calcium magnesium)phosphate finished product.
That adopts step (4) preparation enters stove phosphorus ore raw material, as its W (P 2O 5) when being not less than respectively 14%, 17% and 20%, the effective W (P of the fused(calcium magnesium)phosphate product that makes 2O 5) difference 〉=12%, 15% and 18%; The method is extremely low to the processing rate of dilution that enters stove phosphorus ore raw material, generally is lower than 12%.
Of the present invention take the phosphate rock floating mine tailing as raw material cyclone furnace legal system the method for standby fused(calcium magnesium)phosphate, the useful value of its innovation is: high magnesium flotation phosphate mine tailing is rich in moderate-element magnesium and the calcium constituent (W (MgO) 9~18% that plant-growth needs, W (CaO) 29~38%) reaches abundant trace element, and contain phosphorus, Si element (W (P 2O 5) %8~12%, W (SiO 2) 8~16%), take it as the main material production fused(calcium magnesium)phosphate, contain magnesium, silicon fusing assistant and a large amount of CO are arranged owing to can add less or not add 2Burn and lose the reason of two aspects, so that the effective P of main composition in the melt (fertilizer) 2O 5Be able to enrichment, W (P in the phosphorus ore that generally is mixed 2O 5) 〉=17% can make effective W (P 2O 5) fused(calcium magnesium)phosphate more than 15%, fuse that the flotation phosphate Mine Tailings Utilization can reach more than 70% in the phosphorus ore raw material that is mixed, greatly reduce the production cost of fused(calcium magnesium)phosphate.The present invention provides an economically viable Processes For Effective Conversion for the recycling of high magnesium flotation phosphate mine tailing, for saving phosphor resource, reducing waste sludge discharge, promotes the development of phosphate rock floating Cyclic Economy to have important practical significance.Utilize the phosphate rock floating mine tailing to be main raw material, adopt cyclone furnace to prepare fused(calcium magnesium)phosphate, these production method raw material sources are wide, cost is low; Do not consume sulfuric acid and phosphoric acid, reliable product quality, economically feasible, social benefit is remarkable.
Description of drawings
Fig. 1 whirlwind oven process phosphate rock floating mine tailing feed stock for blast furnace preparation flow figure.
Fig. 2 whirlwind oven process of the present invention fused(calcium magnesium)phosphate production technological process.
Embodiment
The present invention is described further below in conjunction with embodiment, but be not limited to embodiment.
Embodiment 1
The present invention is take the phosphate rock floating mine tailing as main raw material, and the Production Flow Chart main points that adopt cyclone furnace to prepare fused(calcium magnesium)phosphate are described below:
(1) preparation of phosphate rock floating mine tailing raw material
Take the flotation phosphate Tailings Slurry as raw material, by enrichment machine, filter dehydration, obtain moisture 20~40% flotation tailings filter cake; With the wet mine tailing material drying and dehydrating that contains of storing up in this filter cake or the Tailings Dam, obtain the phosphorus mine tailing powder of moisture<2%, mine tailing butt W (P 2O 5) be 8~12%, this powder self fineness accounts for more than 80% for the 100 purpose particles that sieve.The technological process of production is seen Fig. 1.
(2) entering stove fuses the preparation of raw material and is mixed
Other primary phosphorus ore W (P that will join burning 2O 5〉=23%), coal, snake mosquito stone, silica are broken, metering mixes, be ground into fineness is that the 100 purpose particles that sieve account for and join the burning mixed powder more than 90%, wherein the quality proportioning of each ore deposit product meets into stove and fuses raw material to the quality ratio requirement of each ore deposit product, and control is primary phosphorus ore W (P wherein 2O 5〉=23%) quantity that adds so that entering of obtaining of step (1) phosphorus mine tailing powder and its collocation the butt mass ratio of the two is that 100: 12~95-makes the butt W (P into stove phosphorus ore raw material in the stove phosphorus ore raw material 2O 5) be 14~20%.
To join the burning mixed powder and mix with the metering of phosphorus mine tailing, and obtain fusing raw material into stove.Entering the metering proportion that stove fuses various ore deposits product in the raw material is:
What collocation obtained enters 100 parts of stove phosphorus ore raw materials, 190~280 parts of coal dusts, 0~10 part of ground silica, snake stone flour 0-25 part.
(3) raw material enters that stove fuses and the preparation of finished product
Enter stove powder raw material and the air mixed that are mixed are sprayed in the cyclone furnace and fuse; Control cyclone furnace fusing sintering temperature is at 1350 ℃; The control material high-temperature melting time was at 35 minutes; Carry out shrend in the rapid impouring water of melt with the discharge of cyclone furnace slag mouth, control hardening temperature is 25 ℃, melt is come out of the stove be cooled to rapidly after shrend<700 ℃; The fixed melt of loose shape after the shrend by picking up in the pond, is delivered to stockyard filter draining and divided; The solid slag of moisture<25% is dried to moisture<0.5% with whizzer, then to this material pulverize, sub-sieve, fineness requirement accounts for more than 80% of total amount by 250 μ m standard sieve particulate fractions; With the packing of product warehouse-in that is up to the standards.Can guarantee that by this technique the transformation efficiency of phosphorus ore is more than 95%.
Accompanying drawing 2 is seen in the technical process of standby fused(calcium magnesium)phosphate take the phosphate rock floating mine tailing as main raw material cyclone furnace legal system.
The used flotation phosphate mine tailing of this example and enter stove phosphorus ore raw material typical case chemical ingredients (quality %)
Chemical ingredients P 2O 5 MgO CaO SiO 2
Flotation tailings 8.00 13.20 31.80 7.82
Enter stove phosphorus ore raw material 14.00 11.20 30.65 13.80
The prepared fused(calcium magnesium)phosphate technical performance index of this example (chemical ingredients W%)
Chemical ingredients Effective P 2O 5 Effective MgO% CaO% Solvable SiO 2 Moisture %/ Fineness: by 0.25mm standard sieve %/
Fused(calcium magnesium)phosphate 12.40 9.60 31.72 32.02 ≤0.5 ≥80
Embodiment 2
(1) flotation phosphate mine tailing and enter stove phosphorus ore raw material chemical constitution
The used flotation phosphate mine tailing of this example and enter stove phosphorus ore raw material typical case chemical ingredients (quality %)
Chemical ingredients P 2O 5 MgO CaO SiO 2
Flotation tailings 9.20 12.10 30.60 6.10
Enter stove phosphorus ore raw material 15.50 10.96 32.65 14.30
[0039](2) adopt cyclone furnace to prepare Production Flow Chart and the operation steps of fused(calcium magnesium)phosphate
Production Flow Chart and operation control step are identical with embodiment 1, process flow sheet such as Fig. 1, Fig. 2.
(3) the typical process condition of this example
The typical process condition of this example
Fusing sintering temperature (℃) 1380
Fuse the time (min) 40
The hardening temperature (℃) 32
(4) the prepared fused(calcium magnesium)phosphate performance index of this example
The prepared fused(calcium magnesium)phosphate technical performance index of this example (chemical ingredients W%)
Chemical ingredients Effective P 2O 5 Effective MgO% CaO% Solvable SiO 2 Moisture %/ Fineness: by 0.25mm standard sieve %/
Fused(calcium magnesium)phosphate 14.20 11.10 32.18 30.30 ≤0.5 ≥80
Embodiment 3
(1) flotation phosphate mine tailing and enter stove phosphorus ore raw material chemical constitution
The used flotation phosphate mine tailing of this example and enter stove phosphorus ore raw material typical case chemical ingredients (quality %)
Chemical ingredients P 2O 5 MgO CaO SiO 2
Flotation tailings 10.08 11.65 31.68 9.62
Enter stove phosphorus ore raw material 15.85 10.26 32.94 13.96
(2) adopt cyclone furnace to prepare Production Flow Chart and the operation steps of fused(calcium magnesium)phosphate
Production Flow Chart and operation control step are identical with embodiment 1, process flow sheet such as Fig. 1, Fig. 2.
(3) the typical process condition of this example
The typical process condition of this example
Fusing sintering temperature (℃) 1400
Fuse the time (min) 45
The hardening temperature (℃) 40
(4) the prepared fused(calcium magnesium)phosphate performance index of this example
The prepared fused(calcium magnesium)phosphate technical performance index of this example (chemical ingredients W%)
Chemical ingredients Effective P 2O 5 Effective MgO% CaO% Solvable SiO 2 Moisture %/ Fineness: by 0.25mm standard sieve %/
Fused(calcium magnesium)phosphate 14.51 10.39 33.45 30.94 ≤0.5 ≥80
Embodiment 4
(1) flotation phosphate mine tailing and enter stove phosphorus ore raw material chemical constitution
The used flotation phosphate mine tailing of this example and enter stove phosphorus ore raw material typical case chemical ingredients (quality %)
Chemical ingredients P 2O 5 MgO CaO SiO 2
Flotation tailings 10.52 11.34 31.87 10.84
Enter stove phosphorus ore raw material 16.64 10.03 33.42 14.63
(2) adopt cyclone furnace to prepare Production Flow Chart and the operation steps of fused(calcium magnesium)phosphate
Production Flow Chart and operation control step are identical with embodiment 1, process flow sheet such as Fig. 1, Fig. 2.
(3) the typical process condition of this example
The typical process condition of this example
Fusing sintering temperature (℃) 1415
Fuse the time (min) 44
The hardening temperature (℃) 42
(4) the prepared fused(calcium magnesium)phosphate performance index of this example
The prepared fused(calcium magnesium)phosphate technical performance index of this example (chemical ingredients W%)
Chemical ingredients Effective P 2O 5 Effective MgO% CaO% Solvable SiO 2 Moisture %/ Fineness: by 0.25mm standard sieve %/
Fused(calcium magnesium)phosphate 15.47 10.31 34.46 30.19 ≤0.5 ≥80
Embodiment 5
(1) flotation phosphate mine tailing and enter stove phosphorus ore raw material chemical constitution
The used flotation phosphate mine tailing of this example and enter stove phosphorus ore raw material typical case chemical ingredients (quality %)
Chemical ingredients P 2O 5 MgO CaO SiO 2
Flotation tailings 11.20 10.40 31.84 10.15
[0075]
Enter stove phosphorus ore raw material 17.56 9.85 33.86 12.86
(2) adopt cyclone furnace to prepare Production Flow Chart and the operation steps of fused(calcium magnesium)phosphate
Production Flow Chart and operation control step are identical with embodiment 1, process flow sheet such as Fig. 1, Fig. 2.
(3) the typical process condition of this example
The typical process condition of this example
Fusing sintering temperature (℃) 1430
Fuse the time (min) 50
The hardening temperature (℃) 45
(4) the prepared fused(calcium magnesium)phosphate performance index of this example
The prepared fused(calcium magnesium)phosphate technical performance index of this example (chemical ingredients W%)
Chemical ingredients Effective P 2O 5 Effective MgO% CaO% Solvable SiO 2 Moisture %/ Fineness: by 0.25mm standard sieve %/
Fused(calcium magnesium)phosphate 16.05 9.95 34.30 28.83 ≤0.5 ≥80
Embodiment 6
(1) flotation phosphate mine tailing and enter stove phosphorus ore raw material chemical constitution
The used flotation phosphate mine tailing of this example and enter stove phosphorus ore raw material typical case chemical ingredients (quality %)
Chemical ingredients P 2O 5 MgO CaO SiO 2
Flotation tailings 11.68 10.85 33.63 8.15
Enter stove phosphorus ore raw material 18.42 10.34 33.94 13.64
(2) adopt cyclone furnace to prepare Production Flow Chart and the operation steps of fused(calcium magnesium)phosphate
Production Flow Chart and operation control step are identical with embodiment 1, process flow sheet such as Fig. 1, Fig. 2.
(3) the typical process condition of this example
The typical process condition of this example
Fusing sintering temperature (℃) 1450
Fuse the time (min) 48
[0093]
The hardening temperature (℃) 42
(4) the prepared fused(calcium magnesium)phosphate performance index of this example
The prepared fused(calcium magnesium)phosphate technical performance index of this example (chemical ingredients W%)
Chemical ingredients Effective P 2O 5 Effective MgO% CaO% Solvable SiO 2 Moisture %/ Fineness: by 0.25mm standard sieve %/
Fused(calcium magnesium)phosphate 16.98 11.55 34.68 29.87 ≤0.5 ≥80
Embodiment 7
(1) flotation phosphate mine tailing and enter stove phosphorus ore raw material chemical constitution
The used flotation phosphate mine tailing of this example and enter stove phosphorus ore raw material typical case chemical ingredients (quality %)
Chemical ingredients P 2O 5 MgO CaO SiO 2
Flotation tailings 12.00 9.10 32.84 6.18
Enter stove phosphorus ore raw material 20.00 11.56 34.49 12.38
(2) adopt cyclone furnace to prepare Production Flow Chart and the operation steps of fused(calcium magnesium)phosphate
Production Flow Chart and operation control step are identical with embodiment 1, process flow sheet such as Fig. 1, Fig. 2.
(3) the typical process condition of this example
The typical process condition of this example
Fusing sintering temperature (℃) 1430
Fuse the time (min) 50
The hardening temperature (℃) 40
(4) the prepared fused(calcium magnesium)phosphate performance index of this example
The prepared fused(calcium magnesium)phosphate technical performance index of this example (chemical ingredients W%)
Chemical ingredients Effective P 2O 5 Effective MgO% CaO% Solvable SiO 2 Moisture %/ Fineness: by 0.25mm standard sieve %/
Fused(calcium magnesium)phosphate 18.10 11.68 34.61 29.02 ≤0.5 ≥80

Claims (7)

  1. One kind take the phosphate rock floating mine tailing as raw material cyclone furnace legal system the method for standby fused(calcium magnesium)phosphate, take the phosphate rock floating mine tailing as main raw material, adopt the method for cyclone furnace fused(calcium magnesium)phosphate processed, it is characterized in that, may further comprise the steps:
    (1) take the flotation phosphate Tailings Slurry as raw material, the ore pulp butt contains P 2O 5Mass percent be 8~12%, obtain tailing cake by enrichment machine and filter processed, control tailing cake moisture 20-40%;
    (2) adopt drying machine to be dried to the mine tailing material powder of moisture<2% mine tailing of piling up in step (1) tailing cake or the Tailings Dam, its granularity accounts for more than 80% for the 100 purpose particles that sieve;
    (3) that other primary phosphorus ore, coal, snake mosquito stone, the silica metering that will join burning mixes is broken, be ground into fineness is that the 100 purpose particles that sieve account for and join the burning mixed powder more than 80%; Control is the quantity that adds of primary phosphorus ore wherein so that its collocation obtain to enter the two butt mass ratio of stove phosphorus ore raw material and step (2) phosphorus mine tailing powder be 100: 12~95, enter stove phosphorus ore raw material butt and contain P 2O 5Mass percent be 14~20%;
    (4) add the powdery that metering mixes in the cyclone furnace and fuse raw material, the metering proportion that fuses various ore deposits product in the raw material is:
    Step (3) gained powdery enters 100 parts of stove phosphorus ore raw materials, 190~280 parts of coal dusts, 0~10 part of ground silica, snake stone flour 0-20 part;
    (5) powdery with step (4) gained fuses raw material, adopts cyclone furnace to prepare fused(calcium magnesium)phosphate.
  2. According to claim 1 take the phosphate rock floating mine tailing as raw material cyclone furnace legal system the method for standby fused(calcium magnesium)phosphate, it is characterized in that, in the described primary phosphorus ore of step (3), P 2O 5Mass percent 〉=23%.
  3. According to claim 1 take the phosphate rock floating mine tailing as raw material cyclone furnace legal system the method for standby fused(calcium magnesium)phosphate, it is characterized in that the described coal of step (3) is bituminous coal, meager coal or coke.
  4. According to claim 1 take the phosphate rock floating mine tailing as raw material cyclone furnace legal system the method for standby fused(calcium magnesium)phosphate, it is characterized in that the standby fused(calcium magnesium)phosphate of the described employing cyclone furnace of step (5) legal system is undertaken by following production operation step:
    1. step (5) is fused raw material and air mixed sprays in the cyclone furnace, the control furnace temperature is carried out high-temperature fusion at 1350~1450 ℃, gets melt by slag discharge port;
    2. with the shrend of melt water, the solid materials after the shrend is pulled out draining, drying, pulverizes, sieved, get the fused(calcium magnesium)phosphate finished product.
  5. According to claim 1 take the phosphate rock floating mine tailing as raw material cyclone furnace legal system the method for standby fused(calcium magnesium)phosphate, it is characterized in that that adopts step (4) preparation enters stove phosphorus ore raw material, its butt contains P 2O 5Mass percent 〉=14%, effective P in the fused(calcium magnesium)phosphate product that makes 2O 5Content 〉=12%.
  6. According to claim 1 take the phosphate rock floating mine tailing as raw material cyclone furnace legal system the method for standby fused(calcium magnesium)phosphate, it is characterized in that that adopts step (4) preparation enters stove phosphorus ore raw material, its butt contains P 2O 5Mass percent 〉=17%, effective P in the fused(calcium magnesium)phosphate product that makes 2O 5Content 〉=15%.
  7. According to claim 1 take the phosphate rock floating mine tailing as raw material cyclone furnace legal system the method for standby fused(calcium magnesium)phosphate, it is characterized in that that adopts step (4) preparation enters stove phosphorus ore raw material, its butt contains P 2O 5Mass percent 〉=20%, effective P in the fused(calcium magnesium)phosphate product that makes 2O 5Content 〉=18%.。
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AU2014208288B2 (en) * 2013-08-05 2017-05-11 HALL, Robert Hamilton MR Improvements in and relating to rock treatment process
CN103641516B (en) * 2013-12-04 2016-01-20 宣威市恒邦磷化工业有限公司 Calcium magnesium blast furnace realizes fertilizer, iron with stove smelting process
CN113387744B (en) * 2021-05-26 2022-12-02 龙蟒大地农业有限公司 Granular medium-element fertilizer based on phosphorite flotation tailings and preparation method thereof
CN113636883A (en) * 2021-08-13 2021-11-12 云南善施化工有限公司 Method for producing calcium magnesium phosphate fertilizer from phosphate ore flotation tailings
CN113735631A (en) * 2021-09-23 2021-12-03 湖北富邦科技股份有限公司 Production method of low-energy-consumption potassium-calcium-magnesium-phosphate fertilizer

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