CN104860280A - Method for processing phosphorite tailings and producing magnesium-containing calcium carbonate - Google Patents
Method for processing phosphorite tailings and producing magnesium-containing calcium carbonate Download PDFInfo
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Abstract
The invention relates to the technical field of phosphorite tailings processing and treatment, in particular to a phosphorite tailings processing technology and a method for producing magnesium-containing calcium carbonate. First, the decomposition process of calcium-magnesium carbonate is quickened through calcination and digestion treatment, then, combined extraction is carried out with an ammonium nitrate solution and a salpeter solution so that magnesium can be completely extracted and isolated from phosphorite tailings in quantity, and the quality of phosphorite is improved; waste liquid and waste gas generated in the process are recovered, the processed solvent is recycled, magnesium-containing calcium carbonate is obtained while high-quality phosphorite is obtained, calcium and magnesium are effectively recycled, discharge of the waste liquid and the waste gas is avoided, tailings are prevented from accumulating, and therefore, the ecological environment is improved.
Description
Technical field
The present invention relates to phosphate ore processing processing technology field, the method particularly relating to the processing of a kind of phosphorite tailings and produce containing magnesium calcium carbonate.
Background technology
China's phosphorus ore reserves occupy second place of the world, but about 80% of reserves is mid low grade phosphate rock, wherein mostly be the mid-low grade collophanite ore of difficult choosing, thin, the embedding cloth of mineral grain is tight, the impurity such as association magnesium are higher, it can reduce the grade of Rock Phosphate (72Min BPL), increases sulfuric acid consumption during phosphorus ore wet processing, affects the quality of phosphoric acid and phosphoric acid salt deep processing and product.Therefore need to carry out pre-treatment to phosphorus ore, the ore dressing of current China phosphorus ore mainly adopts the method such as flotation, reverse flotation, wherein discharges mine tailing containing P through a reverse flotation and simple scouring
2o
5≤ 15%, MgO>=10%; Mine tailing P is discharged through secondary counter flotation
2o
5≤ 10%, MgO>=15%.Therefore, the mine tailing after ore dressing is more, and wherein also containing more rich available stock, overwhelming majority heap is stored in Tailings Dam, there is comparatively overall situation risk.
Because the composition of various places phosphorus ore is different, the composition difference of phosphorite tailings is also larger, therefore the comprehensive Utilization Ways for phosphorite tailings is also not the same, as the raw material with products such as making cement, gas concrete, devitrified glasses, siliceous high phosphorite tailings is used for the batching of fused(calcium magnesium)phosphate or kiln-process phosphoric acid.But the composition of Guizhou province phosphorus ore is rhombspar and a small amount of phosphatic rock mainly, in prior art, the method adopting Mixed phosphoric acid and sulfuric acid to decompose mine tailing produces calcium superphosphate (magnesium) fertilizer, although the Utilizing question of phosphorite tailings can be solved to a certain extent, but consume a large amount of sulfuric acid, phosphoric acid removes to process the mine tailing that is equivalent to rhombspar and obtain phosphorus fertiliser containing magnesium, do not conform to convention, and normal superphosphate physical property is poor in the market, quality need treat further raising.A large amount of phosphogypsums will be produced in addition after vitriolization, and phosphogypsum is emitted on the severe contamination that will cause environment in physical environment, and the elements such as magnesium are not effectively separated in mine tailing, and then the quality that result in the mine tailing after sulfur acid pretreatment does not improve, do not reach the object of screening concentrate, comprehensive utilization; And in treating processes, after magnesium sulfate and sulfuric acid forms micro-soluble material, make sulfuric acid be difficult to carry out returning recycle, and then cause to carry out the cost in mine tailing preprocessing process larger.CN85107209 discloses a kind of method of chemical sepn, the mode separating magnesium of ammonium chloride and ammonium nitrate mixing leaching will be adopted after phosphorus ore radiation roasting, a kind of processing mode is provided for the quality and by-product recovery that improve low-grade phosphate ore utilize, but in engineer applied, because the chlorion in ammonium chloride and nitrate radical can corrode stainless steel equipment, be difficult to carry out process that is a large amount of and persistence, so have high requirements to the material of equipment, and can not be extensive and economical be applied in actual large production.
For this reason, this researchist carries out analysis and discussion by the form that exists Vanadium Pentoxide in FLAKES in phosphorus mine tailing, calcium, magnesium elements and content etc., and traditional mine tailing complete processing is adjusted, after adopting nitric acid and ammonium nitrate solution to carry out being combined into Combined Processing liquid, again pre-treatment is carried out to phosphorus mine tailing, improve P in mine tailing
2o
5content, then further adopt ammonium sulfate leaching method process, make magnesium elements present ionic state in the solution and then be separated, thus improve the quality of mine tailing; Finally the ammonium salt leaching liquid after separation is processed, obtain calcium, magnesium products.At present employing nitric acid leach with ammonium nitrate compound and improves phosphorite tailings quality, and the method that production contains magnesium calcium carbonate yet there are no bibliographical information, this is the processing of mine tailing, increase added value of product provides a kind of new approaches.
Summary of the invention
The method that the invention provides the processing of a kind of phosphorite tailings and produce containing magnesium calcium carbonate, its step of preparation process is simple, technical process is short, the treatment solution consumed can recycle, without the discharge of waste gas, waste liquid, waste residue, and the content of the Vanadium Pentoxide in FLAKES of phosphorus ore can be increased to more than 35%, Mg content in phosphorus concentrate is reduced to≤1.0%, thus improve quality and the quality of low-grade phosphorus mine tailing, reach the object that resource of tailings utilizes, and can obtain containing magnesium calcium carbonate, improve the comprehensive utilization value of mine tailing.
Concrete technical scheme is as follows:
Phosphorite tailings processing and a method of producing containing magnesium calcium carbonate, comprise the following steps:
By mid low grade phosphate rock high-temperature calcination, hot water digestion; Postdigestive slip adds ammonium nitrate solution and salpeter solution, stirs leaching, is separated, and obtains leached mud and leach liquor, and leached mud is dried, and obtains phosphorus concentrate; Adopt water to absorb the ammonia produced in the carbonic acid gas of calcining generation and leaching process to process, obtain sal volatile, then mix with ammonium nitrate leach liquor, be separated after stirring reaction, filter cake is dried, and obtains containing magnesium calcium carbonate.
Further, described phosphorite tailings processing and the method for producing containing magnesium calcium carbonate, is characterized in that, comprise the following steps:
(1) calcining digestion: middle phosphorite tailings is placed in calcining furnace, high-temperature calcination, hot water digestion;
(2) compound leaching: mine tailing digestion process completed is placed in leaching groove, and then adding concentration is the ammonium nitrate solution of 10%-50% and the salpeter solution of 5%-90%, stirs leaching;
(3) be separated: the slip after step (2) leaching process is carried out filtering, washing, obtains leached mud and leach liquor; Filter residue is dried, and obtains phosphorus concentrate;
(4) absorb: the ammonia produced in the carbonic acid gas of step (1) calcining generation and step (2) leaching process is passed in absorption tower, adopts water to absorb process, obtain sal volatile;
(5) sal volatile that step (4) obtains is mixed with leach liquor step (3) obtained, stirring reaction; Reacted mixed solution filters, washing, returns in leaching step and recycle after ammonium nitrate filtrate and washings mix; Filter cake after leaching is dried, and obtains containing magnesium calcium carbonate.
Aforesaid phosphorite tailings processing and the method for producing containing magnesium calcium carbonate, wherein:
In described step (2), the consumption of ammonium nitrate (rolls over 100% ammonium nitrate for adding 250-350g according to every 100g mine tailing, lower same), the add-on of nitric acid (rolls over 100% nitric acid for adding 2-25g according to every 100g mine tailing, lower same), stir process 50-70min at the temperature of 80-85 DEG C.
In described step (5), volatile salt consumption is for adding 100-110g (rolling over 100% volatile salt, lower same) according to every 100g phosphorus mine tailing, and before using, adjustment concentration is 10-35%, stirring reaction 50-70min at the temperature of 50-80 DEG C.
Be 100-120 DEG C by filter residue bake out temperature in described step (5), the drying and processing time is >=1h.
In described step (1), high-temperature calcination treatment temp is 900-1100 DEG C, and the time is 45-75min; In water digestion process, hot water temperature is 60-100 DEG C, and the consumption of water is that every 100g phosphorus mine tailing adopts 90-110ml water.
Stirring in described step (2), (5) is that treated substance is fully suspended in treatment solution.
Washing in described step (3), (5) is water washing precipitation being adopted every 100g phosphorus mine tailing 20-40ml.
Above-mentioned ammonium nitrate solution and the salpeter solution compound of utilizing leaches in the scheme of processing mine tailing, ammonium nitrate solution can be taked first to join in mine tailing leach, and then join in slip by salpeter solution; Or after salpeter solution and ammonium nitrate solution are mixed, then joined in mine tailing and leached; In adition process, the mode stirred while adding can be adopted to add, also can adopt after having added and stir again.
Compared with prior art, the present invention has following beneficial effect:
(1) the present invention is first by calcining digestion process, accelerates the decomposition course of calcium carbonate and magnesium carbonate, then leaches mode in conjunction with the compound cycle of excess nitric acid ammonium solution and salpeter solution under high temperature, magnesium elements is leached fully, isolate in phosphorus ore in a large number, and then obtain phosphorus concentrate, make P
2o
5content be increased to more than 35%, Mg content is reduced to≤1.0%, improves mine tailing quality, resource is fully used;
(2) the present invention absorbs the ammonia of output in the waste gas produced in calcination process and leaching process, in addition the filtrate after volatile salt process and washings are recycled, greatly protect environment, adapt to the development need of ecotope from now on;
(3) ammonium nitrate and nitric acid compound cycle are leached the filter residue after obtaining high-quality phosphorus ore or filtrate carries out follow-up process, obtain containing magnesium calcium carbonate, not only effective recycling is carried out to calcium magnesium element, the accumulation of phosphorite tailings can also be greatly reduced, both resource recovery was conducive to, improve value-added content of product, be conducive to environment protection again;
(4) processing step of the present invention is simple, and treatment cycle is short, and the energy consumption in treating processes is low, and raw material especially leaching agent can be partially recovered recycle, reduces pretreated cost; And there is no the discharge of waste liquid, waste residue in treating processes, improve the added value of product of whole technique;
(5) the present invention utilizes ammonium nitrate and nitric acid compound to leach and substitutes traditional sulfuric acid treating processes, and reduce the quantity discharged of phosphogypsum, what avoid phosphogypsum stores up the pollution brought to environment in a large number, has the significant value of environmental protection and economic benefit.
Test is adopted to be further elaborated technical scheme of the present invention, to prove effect of the present invention below.
Select the phosphorite tailings in area, Wengan, Guizhou as experimental raw, and the every composition in phosphorus ore detected, draw raw material phosphor mine tailing as shown in table 1:
Table 1
| Composition | P 2O 5 | CaO | MgO | Fe 2O 3 | Al 2O 3 | F | AI | Burn and lose |
| ％ | 7.23 | 34.94 | 17.65 | 0.22 | 0.24 | 0.62 | 3.15 | 37.2 |
Test example 1 technical study
1.1 calcining digestion
Mid low grade phosphate rock powder is calcined, digests, following reaction occurs:
CaCO
3·Mg CO
3→CaO+MgO+2CO
2
CaO+MgO+2H
2O→Ca(OH)
2+Mg(OH)
2
At the temperature lower calcination process 45-75min of 900-1100 DEG C, ensure the abundant decomposition of calcium carbonate and magnesium carbonate.
1.2 ammonium nitrate, nitric acid compound leach
Get 100g phosphorus mine tailing respectively, after carrying out calcining digestion process, investigate different ammonium nitrate consumptions (200g, 250g, 300g, 350g, 400g), concentration (10%, 20%, 30%, 40%, 50%) respectively, leaching temperature (20-25 DEG C, 65-75 DEG C, 80-85 DEG C), leaching time (40min, 50min, 60min, 70min, 80min, 90min), the factors such as concentration of nitric acid (5%, 15%, 25%, 35%, 45%, 60%, 75%, 90%), consumption (2g, 5g, 10g, 18g, 20g, 22g, 25g) are to P
2o
5the impact of content, investigates result and shows, selects the consumption of ammonium nitrate for add 250-350g, concentration 10%-50% according to every 100g phosphorus mine tailing, the add-on of salpeter solution is for add 2-25g, concentration 5%-90% according to every 100g phosphorus mine tailing, leaching 50-70min, leaching temperature 80-85 DEG C, P
2o
5content is increased to 36.14%.The consumption of preferred ammonium nitrate is for add 300g, concentration 30% according to every 100g phosphorus mine tailing, and the add-on of salpeter solution, for add 20g, concentration 60% according to every 100g phosphorus mine tailing, leaches 60min, leaching temperature 80 DEG C.
Reaction formula is as follows:
Ca(OH)
2+NH
4NO
3+HNO
3→Ca(NO
3)
2+NH
3+2H
2O
Test example 2 process certification
Get phosphorus mine tailing 1kg respectively, process according to the method for embodiment of the present invention 1-3, again the content of the Vanadium Pentoxide in FLAKES in phosphorus concentrate and magnesian content are detected, draw: the content of Vanadium Pentoxide in FLAKES is 36.4-37.0%, and magnesian content is 0.7-0.9%; Visible, the technical scheme in this invention can make the content of the Vanadium Pentoxide in FLAKES in the phosphorus ore of middle-low grade improve 28-30 percentage point, Mg content in phosphorus mine tailing can be reduced to≤1.0%; Reach the object of recycling; Reduce the waste residue saturation of phosphorus ore advanced treatment, reduce environmental pollution.
Further, follow-up ammonium salt leaching liquid volatile salt liquid precipitate is produced containing magnesium calcium carbonate, its composition amounts to that calcium carbonate content is 53.1%, magnesiumcarbonate 46.5%.Can be used as the filler of Plastic Rubber Products, be better than conventional calcium carbonates.Improve value-added content of product after the pre-treatment of phosphorus mine tailing.
In addition, by carrying out the process certification under laboratory condition to the phosphorus mine tailing of other areas as Fuquan area, Kaiyang Region, result shows the processing and utilization that technical scheme of the present invention is suitable for above-mentioned regional phosphorus mine tailing equally, the phosphorus concentrate of phosphorus pentoxide content more than 35% can be obtained, and can also obtain containing magnesium calcium carbonate product, also resource is fully reclaimed simultaneously, in treating processes, there is no the discharge of waste gas, waste liquid, waste residue, improve the added value of product of whole technique.
Accompanying drawing explanation
Fig. 1 is phosphorite tailings of the present invention processing and the process flow sheet producing the method containing magnesium calcium carbonate.
Embodiment:
Below in conjunction with accompanying drawing and concrete embodiment, further restriction is done to technical scheme of the present invention, but claimed scope is not only confined to done description
Embodiment 1
Phosphorite tailings processing and a method of producing containing magnesium calcium carbonate, comprise the following steps:
(1) calcining digestion: mid low grade phosphate rock is placed in calcining furnace, at the temperature lower calcination process 60min of 950 DEG C, then carries out water digestion process; Described water digestion process is that employing 85 DEG C of hot water carry out, and the consumption of water is that every 100g phosphorus mine tailing adopts 100ml water;
(2) compound leaching: phosphorus mine tailing digestion process completed is placed in leaching groove, and then adding concentration is the ammonium nitrate solution of 30% and the salpeter solution of 60%, stir process 60min at the temperature of 85 DEG C; The consumption of ammonium nitrate is for add 300g according to every 100g phosphorus mine tailing, and the add-on of salpeter solution is for add 20g according to every 100g phosphorus mine tailing;
(3) being separated: by step 2) slip after leaching process carries out filtering, washing, and obtains leached mud and leach liquor; Filter residue dries 1h at 110 DEG C, obtains phosphorus concentrate;
(4) absorb: the ammonia produced in the carbonic acid gas of step (1) calcining generation and step (2) leaching process is passed in absorption tower, adopts water to absorb process, obtain sal volatile;
(5) sal volatile adjustment concentration step (4) obtained is 25%, and mix with leach liquor step (3) obtained, stirring reaction 60min, temperature of reaction is 65 DEG C; Reacted mixed solution filters, washing, returns in leaching step and recycle after ammonium nitrate filtrate and washings mix; Filter cake after leaching 110 DEG C of oven dry >=1h, obtain containing magnesium calcium carbonate.Described volatile salt consumption is for add 105g according to every 100g phosphorus mine tailing.
Stirring in described step (2), (5) is that treated substance is fully suspended in treatment solution.
Washing in described step (3), (5) is water washing precipitation being adopted every 100g phosphorus mine tailing 20-40ml.
Result: P in phosphorus concentrate
2o
5content 36.6%, Mg content 0.80%.
Embodiment 2
Phosphorite tailings processing and a method of producing containing magnesium calcium carbonate, comprise the following steps:
(1) calcining digestion: middle-low grade phosphorus mine tailing is placed in calcining furnace, at the temperature lower calcination process 75min of 900 DEG C, then carries out water digestion process; Described water digestion process is that employing 60 DEG C of hot water carry out, and the consumption of water is that every 100g phosphorus mine tailing adopts 110ml water;
(2) compound leaching: phosphorus mine tailing digestion process completed is placed in leaching groove, and then adding concentration is the ammonium nitrate solution of 10% and the salpeter solution of 50%, stir process 70min at the temperature of 80 DEG C; The consumption of ammonium nitrate is for add 250g according to every 100g phosphorus mine tailing, and the add-on of salpeter solution is for add 18g according to every 100g phosphorus mine tailing;
(3) being separated: by step 2) slip after leaching process carries out filtering, washing, and obtains leached mud and leach liquor; Filter residue dries 1.5h at 110 DEG C, obtains phosphorus concentrate;
(4) absorb: the ammonia produced in the carbonic acid gas of step (1) calcining generation and step (2) leaching process is passed in absorption tower, adopts water to absorb process, obtain sal volatile;
(5) sal volatile adjustment concentration step (4) obtained is 10%, and mix with leach liquor step (3) obtained, stirring reaction 70min, temperature of reaction is 50 DEG C; Reacted mixed solution filters, washing, returns in leaching step and recycle after ammonium nitrate filtrate and washings mix; Filter cake after leaching dries 1h at 110 DEG C, obtains containing magnesium calcium carbonate.Described volatile salt consumption is for add 100g according to every 100g phosphorus mine tailing.
Stirring in described step (2), (5) is that treated substance is fully suspended in treatment solution.
Washing in described step (3), (5) is water washing precipitation being adopted every 100g phosphorus mine tailing 20-40ml.
Result: P in phosphorus concentrate
2o
5content 36.4%, Mg content 0.87%.
Embodiment 3
Phosphorite tailings processing and a method of producing containing magnesium calcium carbonate, comprise the following steps:
(1) calcining digestion: middle-low grade phosphorus mine tailing is placed in calcining furnace, at the temperature lower calcination process 45min of 1100 DEG C, then carries out water digestion process; Described water digestion process is that employing 100 DEG C of hot water carry out, and the consumption of water is that every 100g phosphorus mine tailing adopts 90ml water;
(2) compound leaching: phosphorus mine tailing digestion process completed is placed in leaching groove, and then adding concentration is the ammonium nitrate solution of 50% and the salpeter solution of 80%, stir process 50min at the temperature of 85 DEG C; The consumption of ammonium nitrate is for add 350g according to every 100g phosphorus mine tailing, and the add-on of salpeter solution is for add 22g according to every 100g phosphorus mine tailing;
(3) being separated: by step 2) slip after leaching process carries out filtering, washing, and obtains leached mud and leach liquor; Filter residue, at 110 DEG C of oven dry >=1h, obtains phosphorus concentrate;
(4) absorb: the ammonia produced in the carbonic acid gas of step (1) calcining generation and step (2) leaching process is passed in absorption tower, adopts water to absorb process, obtain sal volatile;
(5) sal volatile adjustment concentration step (4) obtained is 35%, and mix with leach liquor step (3) obtained, stirring reaction 50min, temperature of reaction is 80 DEG C; Reacted mixed solution filters, washing, returns in leaching step and recycle after ammonium nitrate filtrate and washings mix; Filter cake after leaching, at 110 DEG C of oven dry >=1h, obtains containing magnesium calcium carbonate.Described volatile salt consumption is for add 110g according to every 100g phosphorus mine tailing.
Stirring in described step (2), (5) is that treated substance is fully suspended in treatment solution.
Washing in described step (3), (5) is water washing precipitation being adopted every 100g phosphorus mine tailing 20-40ml.
Result: P in phosphorus concentrate
2o
5content 37.0%, Mg content 0.71%.
Embodiment 4
Phosphorite tailings processing and a method of producing containing magnesium calcium carbonate, comprise the following steps:
(1) calcining digestion: middle-low grade phosphorus mine tailing is placed in calcining furnace, at the temperature lower calcination process 60min of 1000 DEG C, then carries out water digestion process; Described water digestion process is that employing 100 DEG C of hot water carry out, and the consumption of water is that every 100g phosphorus mine tailing adopts 90ml water;
(2) compound leaching: phosphorus mine tailing digestion process completed is placed in leaching groove, and then adding concentration is the ammonium nitrate solution of 20% and the salpeter solution of 90%, stir process 60min at the temperature of 85 DEG C; The consumption of ammonium nitrate is for add 280g according to every 100g phosphorus mine tailing, and the add-on of salpeter solution is for add 21g according to every 100g phosphorus mine tailing;
(3) being separated: by step 2) slip after leaching process carries out filtering, washing, and obtains leached mud and leach liquor; Filter residue, at 110 DEG C of oven dry >=1h, obtains phosphorus concentrate;
(4) absorb: the ammonia produced in the carbonic acid gas of step (1) calcining generation and step (2) leaching process is passed in absorption tower, adopts water to absorb process, obtain sal volatile;
(5) sal volatile adjustment concentration step (4) obtained is 25%, and mix with leach liquor step (3) obtained, stirring reaction 50min, temperature of reaction is 80 DEG C; Reacted mixed solution filters, washing, returns in leaching step and recycle after ammonium nitrate filtrate and washings mix; Filter cake after leaching, at 110 DEG C of oven dry >=1h, obtains containing magnesium calcium carbonate.Described volatile salt consumption is for add 110g according to every 100g phosphorus mine tailing.
Stirring in described step (2), (5) is that treated substance is fully suspended in treatment solution.
Washing in described step (3), (5) is water washing precipitation being adopted every 100g phosphorus mine tailing 20-40ml.
Result: P in phosphorus concentrate
2o
5content 36.8%, Mg content 0.73%.
Claims (8)
1. phosphorite tailings processing and production are containing a method for magnesium calcium carbonate, it is characterized in that, comprise the following steps:
By mid low grade phosphate rock high-temperature calcination, hot water digestion; Postdigestive slip adds ammonium nitrate solution and salpeter solution, stirs leaching, is separated, and obtains leached mud and leach liquor, and leached mud is dried, and obtains phosphorus concentrate; Adopt water to absorb the ammonia produced in the carbonic acid gas of calcining generation and leaching process to process, obtain sal volatile, then mix with ammonium nitrate leach liquor, be separated after stirring reaction, filter cake is dried, and obtains containing magnesium calcium carbonate.
2. phosphorite tailings processing as claimed in claim 1 and production are containing the method for magnesium calcium carbonate, it is characterized in that, comprise the following steps:
(1) calcining digestion: phosphorite tailings is placed in calcining furnace, high-temperature calcination, hot water digestion;
(2) compound leaching: mine tailing digestion process completed is placed in leaching groove, and then adding concentration is the ammonium nitrate solution of 10%-50% and the salpeter solution of 5%-90%, stirs leaching;
(3) be separated: the slip after step (2) leaching process is carried out filtering, washing, obtains leached mud and leach liquor; Filter residue is dried, and obtain phosphorus concentrate, the content of Vanadium Pentoxide in FLAKES is increased to more than 35%, Mg content in phosphorus concentrate is reduced to≤1.0%;
(4) absorb: the ammonia produced in the carbonic acid gas of step (1) calcining generation and step (2) leaching process is passed in absorption tower, adopts water to absorb process, obtain sal volatile;
(5) sal volatile that step (4) obtains is mixed with leach liquor step (3) obtained, stirring reaction; Reacted mixed solution filters, washing, returns in leaching step and recycle after ammonium nitrate filtrate and washings mix; Filter cake after leaching is dried, and obtains containing magnesium calcium carbonate.
3. phosphorite tailings processing as claimed in claim 1 or 2 and production contain the method for magnesium calcium carbonate, it is characterized in that: in described step (2), the consumption of ammonium nitrate is for add 250-350g according to every 100g mine tailing, the add-on of nitric acid for add 2-25g according to every 100g mine tailing, stir process 50-70min at the temperature of 80-85 DEG C.
4. phosphorite tailings processing as claimed in claim 1 or 2 and production contain the method for magnesium calcium carbonate, it is characterized in that: in described step (5), volatile salt consumption is for add 100-110g according to every 100g phosphorus mine tailing, before using, adjustment concentration is 10-35%, stirring reaction 50-70min at the temperature of 50-80 DEG C.
5. phosphorite tailings processing as claimed in claim 1 or 2 and the method for producing containing magnesium calcium carbonate, is characterized in that: be 100-120 DEG C by filter residue bake out temperature in described step (5), the drying and processing time is >=1h.
6. phosphorite tailings processing as claimed in claim 1 or 2 and production are containing the method for magnesium calcium carbonate, it is characterized in that: in described step (1), high-temperature calcination treatment temp is 900-1100 DEG C, and the time is 45-75min; In water digestion process, hot water temperature is 60-100 DEG C, and the consumption of water is that every 100g phosphorus mine tailing adopts 90-110ml water.
7. phosphorite tailings processing as claimed in claim 1 or 2 and production are containing the method for magnesium calcium carbonate, it is characterized in that: the stirring in described step (2), (5) is that treated substance is fully suspended in treatment solution.
8. phosphorite tailings processing as claimed in claim 1 or 2 and production are containing the method for magnesium calcium carbonate, it is characterized in that: the washing in described step (3), (5) is to precipitate the water washing adopting every 100g phosphorus mine tailing 20-40ml.
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| CN1113900A (en) * | 1994-06-01 | 1995-12-27 | 门伟 | Producing method for nitrate phosphate fertilizer |
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| CN105399068A (en) | 2016-03-16 |
| CN105399068B (en) | 2018-09-07 |
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