CN104261365A - Enriching and pelletizing method of low-grade powdered rock phosphate - Google Patents
Enriching and pelletizing method of low-grade powdered rock phosphate Download PDFInfo
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- CN104261365A CN104261365A CN201410493118.2A CN201410493118A CN104261365A CN 104261365 A CN104261365 A CN 104261365A CN 201410493118 A CN201410493118 A CN 201410493118A CN 104261365 A CN104261365 A CN 104261365A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses an enriching and pelletizing method of low-grade powdered rock phosphate. The enriching and pelletizing method comprises the steps of pretreating low-grade phosphorus ores by crushing, sieving, drying and homogenizing to prepare powdered rock phosphate with the water content of 5-8wt% and the particle size of smaller than or equal to 10mm, and adding an adhesive prepared from acid residues as intermediate products of dihydrate wet-process phosphoric acid production, wherein the weight ratio of the adhesive to the powdered rock phosphate is (3-4):(6-7); uniformly stirring to form a mixture; and after pressing the mixture to form a pellet, drying and preheating by virtue of hot air to prevent the green pellet from cracking; and roasting in a rotary kiln at the temperature of 850-950 DEG C, and carrying out air cooling. The P2O5 content of a phosphorus ore pellet produced by using the method is increased by about 10%, the rate of finished products is greatly increased, and the material return ratio is lower than 10%; the tail gas of the phosphorus furnace is sufficiently utilized, and no newly-increased energy consumption is generated, so that a great number of energy sources are saved; and the low-grade phosphorus ores which only contain 15-19% of P2O5 and cannot be used at present are applied to yellow phosphorus production, so that the efficient and comprehensive utilization of phosphate rock resources is realized.
Description
Technical field
The present invention relates to a kind of pelletizing method of low grade rock phosphate, belong to technical field of phosphorous chemical industry.
Technical background
China's phosphate rock resource rich reserves, but rich ore is less, and middle and low grade bauxite is in the majority.Along with the high speed development of phosphorus chemical industry, phosphate rock resource consumes in a large number, and phosphorus ore is classified as one of coming 10 years 20 mineral that can not meet national economic development demand by land resources department.The comprehensive utilization of middle-low grade, particularly low-grade phosphate ore becomes the key that sulphur dioxide of phosphor chemical industry is extricated oneself from a plight.In China's phosphate rock resource, more than 70% is the collophanite of middle-low grade, because its granularity is tiny, close structure, more containing detrimental impurity, ore dressing is more difficult, high expensive, be not suitable for high-concentration phosphate compound fertilizers to produce, but after the art breading such as enrichment of ore-forming block, can be used for phosphorus production, and relatively economical and reasonable.The conventional sintering of existing sulphur dioxide of phosphor chemical industry and knurl are tied two kinds of methods and are carried out the low-grade ground phosphate rock of centering and carry out enrichment and cause nugget, and as phosphorus production raw material, but sinter and rotary kiln baking temperature high (about 1250 ~ 1300 DEG C), fuel consumption is larger; P in phosphorus ore
2o
5content improve very limited, generally only about 1%; Qualified yield rate is lower, and returning charge rate is generally all more than 30 ~ 50%.CN 103663396 discloses a kind of method utilizing mid low grade phosphate rock or ground phosphate rock balling-up, it uses mid low grade phosphate rock powder or ground phosphate rock, water or phosphoric acid, coke powder, one or more in phosphate refractory mud, white clay, water glass, soda ash, calcium carbonate, serpentine, after raw material is mixed, balling-up is suppressed with ball press, drying, after roasting, to vertical calcining kiln, still with the yellow phosphoric tail gas after purification, be heated to 850 ~ 950 DEG C, the phosphorus ore ball made after carrying out roasting, for the production of yellow phosphorus or fused(calcium magnesium)phosphate.Though the method does not use binding agent, operation relative complex, it is more to add composition, is difficult to control and must the defect such as additional subsequent process after pyroreaction to the chemical composition in finished product and waste.
Summary of the invention
The object of this invention is to provide a kind of enrichment pelletizing method of low grade rock phosphate, utilize the binding agent that the intermediate product in two water thing method Wet-process Phosphoric Acid Production is made, with through broken, sieve, dry and the pretreated low grade rock phosphate Homogeneous phase mixing of operation, stirring, the pelletizing such as homogenizing, again through preheating, roasting and cooling, produce the phosphorus ore pelletizing for phosphorus production.The method effectively overcomes the defect that prior art exists, and proposes the new technical scheme of a kind of save energy, utilize resources synthetically.
The present invention is achieved through the following technical solutions:
A kind of enrichment pelletizing method of low grade rock phosphate, low-grade phosphate ore is after broken, screening, oven dry and homogenizing pre-treatment, making weight percent moisture is 5% ~ 8%, the ground phosphate rock of granularity≤10mm, send into mixing machine, the outstanding difference of itself and prior art is: the solid substance weight percentage that the intermediate product acid sludge adding two water thing method Wet-process Phosphoric Acid Production is made is 15% ~ 60%, P
2o
5weight percentage be the binding agent of 30% ~ 46%, the proportioning of binding agent and ground phosphate rock weight ratio is 3 ~ 4:6 ~ 7, uniform stirring 4 ~ 6 minutes, obtain the compound that weight percent moisture is 9% ~ 12%, send into the ball that ball press is pressed into diameter 20 ~ 50mm, with the hot-air pre-heating drying that temperature is 100 ~ 200 DEG C, time is 25 ~ 30 minutes, prevent green-ball from breaking, send into rotary kiln again, utilize phosphorus furnace exhaust gas, at 850 ~ 950 DEG C of roasting temperatures, time is 30 ~ 35 minutes, less than 100 DEG C are cooled to through air cooling, namely the phosphorus ore pelletizing for phosphorus production is made.
The waste gas that preheating and drying, roasting, cooling produce is qualified discharge after dedusting, washing, and fine particle and dust return mixing machine and reuse.
The phosphorus ore pelletizing that the middle acid sludge that technological method of the present invention makes full use of two water thing method wet method phosphoric acid manufacture process is produced as binding agent after processing, P
2o
5content improve about 10% than raw ore; The yield rate of phosphorus ore pelletizing significantly improves, and returning charge rate is lower than 10%; The maturing temperature of rotary kiln controls, between 850 ~ 950 DEG C, need not rise to the melt temperature of about 1300 DEG C, and also without the need to the consumption of newly-increased coke powder equal energy source, making full use of phosphorus furnace exhaust gas can meet the demands, and saves mass energy; By the P that also cannot use at present
2o
5content is only the production that 15% ~ 19% low-grade phosphate ore is applied to yellow phosphorus product, achieves the high-efficiency comprehensive utilization of phosphate rock resource.
Accompanying drawing explanation
Accompanying drawing 1 is production schematic diagram of the present invention.
Embodiment
Following embodiment is intended to describe in further detail and explain the present invention, instead of limits the present invention by any way.Those of ordinary skill in the art's any simple modifications made for the present invention and replacement, all should fall within protection scope of the present invention.
Embodiment 1
An enrichment pelletizing method for low grade rock phosphate, P
2o
5content is that the low-grade phosphate ore of 15% is after broken, screening, oven dry and homogenizing pre-treatment, making weight percent moisture is 5%, the ground phosphate rock of granularity≤10mm, sends into mixing machine, the solid substance weight percentage that the intermediate product acid sludge adding two water thing method Wet-process Phosphoric Acid Production is made is 20%, P
2o
5weight percentage be the binding agent of 45%, the proportioning of binding agent and ground phosphate rock weight ratio is 3:7, uniform stirring 5 minutes, obtain the compound that weight percent moisture is 9%, send into the ball that ball press is pressed into diameter 30mm, with warm air drying and preheating that temperature is 105 DEG C, time is 25 minutes, prevent green-ball from breaking, then send into rotary kiln, at 850 DEG C of roasting temperatures, time is 35 minutes, be cooled to less than 90 DEG C through air cooling, namely make the phosphorus ore pelletizing for phosphorus production, P in phosphorus ore pelletizing
2o
5content improve 10 %.
Embodiment 2
An enrichment pelletizing method for low grade rock phosphate, P
2o
5content is that the low-grade phosphate ore of 17% is after broken, screening, oven dry and homogenizing pre-treatment, making weight percent moisture is 7%, the ground phosphate rock of granularity≤10mm, sends into mixing machine, the solid substance weight percentage that the intermediate product acid sludge adding two water thing method Wet-process Phosphoric Acid Production is made is 30%, P
2o
5weight percentage be the binding agent of 43%, the proportioning of binding agent and ground phosphate rock weight ratio is 3:7, uniform stirring 5 minutes, obtain the compound that weight percent moisture is 10%, send into the ball that ball press is pressed into diameter 40mm, with warm air drying and preheating that temperature is 120 DEG C, time is 28 minutes, prevent green-ball from breaking, then send into rotary kiln, at 900 DEG C of roasting temperatures, time is 32 minutes, be cooled to less than 70 DEG C through air cooling, namely make the phosphorus ore pelletizing for phosphorus production, P in phosphorus ore pelletizing
2o
5content improve 9 %.
Embodiment 3
An enrichment pelletizing method for low grade rock phosphate, P
2o
5content is that the low-grade phosphate ore of 19% is after broken, screening, oven dry and homogenizing pre-treatment, making weight percent moisture is 8%, the ground phosphate rock of granularity≤10mm, sends into mixing machine, the solid substance weight percentage that the intermediate product acid sludge adding two water thing method Wet-process Phosphoric Acid Production is made is 50%, P
2o
5weight percentage be the binding agent of 35%, the proportioning of binding agent and ground phosphate rock weight ratio is 4:6, uniform stirring 5 minutes, obtain the compound that weight percent moisture is 12%, send into the ball that ball press is pressed into diameter 50mm, with warm air drying and preheating that temperature is 190 DEG C, time is 30 minutes, prevent green-ball from breaking, then send into rotary kiln, at 950 DEG C of roasting temperatures, time is 30 minutes, be cooled to less than 60 DEG C through air cooling, namely make the phosphorus ore pelletizing for phosphorus production, P in phosphorus ore pelletizing
2o
5content improve 8 %.
Claims (1)
1. the enrichment pelletizing method of a low grade rock phosphate, low-grade phosphate ore is after broken, screening, oven dry and homogenizing pre-treatment, making weight percent moisture is 5% ~ 8%, the ground phosphate rock of granularity≤10mm, send into mixing machine, it is characterized in that: the solid substance weight percentage that the intermediate product acid sludge adding two water thing method Wet-process Phosphoric Acid Production is made is 15% ~ 60%, P
2o
5weight percentage be the binding agent of 35% ~ 46%, the proportioning of binding agent and ground phosphate rock weight ratio is 3 ~ 4:6 ~ 7, uniform stirring 3 ~ 7 minutes, obtain the compound that weight percent moisture is 9% ~ 12%, send into the ball that ball press is pressed into diameter 20mm ~ 50mm, with warm air drying and preheating that temperature is 100 ~ 200 DEG C, time is 25 ~ 30 minutes, send into rotary kiln again, at 850 ~ 950 DEG C of roasting temperatures, time is 30 ~ 35 minutes, is cooled to less than 100 DEG C through air cooling, namely makes the phosphorus ore pelletizing for phosphorus production.
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| CN201410493118.2A CN104261365B (en) | 2014-09-24 | 2014-09-24 | A kind of enrichment pelletizing method of low grade rock phosphate |
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| CN201410493118.2A CN104261365B (en) | 2014-09-24 | 2014-09-24 | A kind of enrichment pelletizing method of low grade rock phosphate |
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| CN104261365A true CN104261365A (en) | 2015-01-07 |
| CN104261365B CN104261365B (en) | 2016-03-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108249411A (en) * | 2018-01-02 | 2018-07-06 | 昆明理工大学 | A kind of ground phosphate rock or broken phosphorus ore binding agent preparation method and type ore deposit production method |
| CN111186825A (en) * | 2020-01-10 | 2020-05-22 | 郑州大学 | Method for preparing sintered pellets from low-grade phosphate ore and phosphorus chemical industry waste |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102701164A (en) * | 2012-01-04 | 2012-10-03 | 张兴华 | Processing method for preparing phosphate rock powder into pellet yellow phosphorus charge |
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- 2014-09-24 CN CN201410493118.2A patent/CN104261365B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102701164A (en) * | 2012-01-04 | 2012-10-03 | 张兴华 | Processing method for preparing phosphate rock powder into pellet yellow phosphorus charge |
Non-Patent Citations (1)
| Title |
|---|
| 段付岗: "二水法磷酸生产中滤饼板结的原因及对策", 《磷肥与复肥》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108249411A (en) * | 2018-01-02 | 2018-07-06 | 昆明理工大学 | A kind of ground phosphate rock or broken phosphorus ore binding agent preparation method and type ore deposit production method |
| CN111186825A (en) * | 2020-01-10 | 2020-05-22 | 郑州大学 | Method for preparing sintered pellets from low-grade phosphate ore and phosphorus chemical industry waste |
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| CN104261365B (en) | 2016-03-30 |
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