A method for regulating monoammonium phosphate supernutrients by utilizing phosphate rock flotation tailings

Abstract

The invention provides a method for adjusting enriched nutrients in monoammonium phosphate through utilizing phosphate flotation tailings. The method includes the following steps: taking phosphate flotation tailings as raw materials, and adding phosphate flotation tailings subjected to concentration and treated by a filter to diluted phosphoric acid for mixed reaction; introducing ammonia gas for neutralizing and then adding nitrogenous fertilizer, uniformly mixing for nitrogen increment, so as to obtain qualified monoammonium phosphate slurry; performing concentration, spraying granulation, drying, sieving, cooling, wrapping and package to the slurry to obtain the monoammonium phosphate product. According to the invention, an effective technological approach is provided for the comprehensive utilization of phosphate flotation tailings, the method has important practical significances in saving phosphate rock resources, improving the pelleting performance of monoammonium phosphate slurry, increasing the nutritional value of the monoammonium phosphate product, adjusting the enriched nutrients of the monoammonium phosphate product, reducing discharge and stockpiling of phosphate flotation tailings and promoting the sustainable development of the phosphate and compound fertilizer industry; besides, raw materials are wide in source and low in cost, and new waste residues and waste water cannot be generated.

Description

technical field

[0001] The invention relates to the field of chemical fertilizer production, in particular to a method for regulating monoammonium phosphate supernutrients by utilizing phosphate ore flotation tailings. Background technique

[0002] my country's phosphate rock resources are mainly medium and low-grade phosphate rock, with high impurity content. Most of the phosphate rock needs to be enriched by flotation before it can be used in the production of wet-process phosphoric acid, and wet-process phosphoric acid is mainly used for monoammonium phosphate. (MAP) and diammonium phosphate (DAP) production. According to the characteristics of phosphate rock resources in our country, the flotation and enrichment methods of phosphate rock mainly include single repeated election, forward flotation, forward-reverse flotation, double double election, gravity beneficiation, washing, etc. No matter what kind of flotation enrichment The collection method will produce a large am...

Examples

Embodiment 1

[0026] In this example, phosphate rock flotation tailings slurry is used as raw material, and qualified monoammonium phosphate slurry is obtained through tailings slurry thickening and filtration, phosphoric acid leaching, slurry neutralization, and nitrogen supplementation, and the adjustment of monoammonium phosphate supernutrients is realized. Its production process is shown in the appendix figure 1 .

[0027] (1) The chemical composition (mass percentage %) of the phosphate rock flotation tailings raw material used in this example

[0028]

[0029] (2) The technological process and operation steps of this example are as follows:

[0030] The phosphate ore flotation tailings 6 are sent to the high-efficiency thickener thickener 1, and the bottom dense phase 11 is sent to the filter 2 for filtration and separated into filter cake 12 and filtrate 17, and the filtrate 17 and the upper clear liquid 16 are combined to form tailings backwater 10 Return to Phosphate Float

...

Embodiment 2

[0037] (1) The chemical composition (mass percentage %) of the phosphate rock flotation tailings raw material used in this example

[0038]

[0039] (2) Send the phosphate ore flotation tailings 6 to the high-efficiency thickener thickener 1, and the bottom dense phase 11 is sent to the filter 2 for filtration and separated into filter cake 12 and filtrate 17, and the filtrate 17 and the supernatant liquid 16 merge to form tailings Backwater 10 returns to the phosphate rock flotation unit; metered filter cake 12 and 25.02%P 2 o 5 Dilute phosphoric acid 7 is placed in the phosphoric acid leaching tank 3, the reaction temperature is controlled at 80-85°C, the stirring speed is 400r / min, and the reaction time is 70min, and the mixed slurry 13 is obtained after the phosphoric acid leaching reaction is sufficient; the measured mixed slurry 13 and ammonia 8 in the neutralization tank 4 until the pH value reaches 4.5-4.7 to obtain a neutralized slurry 14, and control the neutrali...

Embodiment 3

[0045] (1) The chemical composition (mass percentage %) of the phosphate rock flotation tailings raw material used in this example

[0046]

[0047] (2) The technological process and operation steps of this example are as follows:

[0048] The phosphate ore flotation tailings 6 are sent to the high-efficiency thickener thickener 1, and the bottom dense phase 11 is sent to the filter 2 for filtration and separated into filter cake 12 and filtrate 17, and the filtrate 17 and the upper clear liquid 16 are combined to form tailings backwater 10 Back to phosphate rock flotation unit; metered filter cake 12 and 30.63% P 2 o 5 Dilute phosphoric acid 7 is placed in the phosphoric acid leaching tank 3, the reaction temperature is controlled at 85-90°C, the stirring speed is 500r / min, and the reaction time is 60min, and the mixed slurry 13 is obtained after the phosphoric acid leaching reaction is sufficient; the measured mixed slurry 13 and ammonia 8 in the neutralization tank 4 u...

technical field

[0001] The invention relates to the field of chemical fertilizer production, in particular to a method for regulating monoammonium phosphate supernutrients by utilizing phosphate ore flotation tailings. Background technique

[0002] my country's phosphate rock resources are mainly medium and low-grade phosphate rock, with high impurity content. Most of the phosphate rock needs to be enriched by flotation before it can be used in the production of wet-process phosphoric acid, and wet-process phosphoric acid is mainly used for monoammonium phosphate. (MAP) and diammonium phosphate (DAP) production. According to the characteristics of phosphate rock resources in our country, the flotation and enrichment methods of phosphate rock mainly include single repeated election, forward flotation, forward-reverse flotation, double double election, gravity beneficiation, washing, etc. No matter what kind of flotation enrichment The collection method will produce a large am...

Examples

Embodiment 1

[0026] In this example, phosphate rock flotation tailings slurry is used as raw material, and qualified monoammonium phosphate slurry is obtained through tailings slurry thickening and filtration, phosphoric acid leaching, slurry neutralization, and nitrogen supplementation, and the adjustment of monoammonium phosphate supernutrients is realized. Its production process is shown in the appendix figure 1 .

[0027] (1) The chemical composition (mass percentage %) of the phosphate rock flotation tailings raw material used in this example

[0028]

[0029] (2) The technological process and operation steps of this example are as follows:

[0030] The phosphate ore flotation tailings 6 are sent to the high-efficiency thickener thickener 1, and the bottom dense phase 11 is sent to the filter 2 for filtration and separated into filter cake 12 and filtrate 17, and the filtrate 17 and the upper clear liquid 16 are combined to form tailings backwater 10 Return to Phosphate Float

...

Embodiment 2

[0037] (1) The chemical composition (mass percentage %) of the phosphate rock flotation tailings raw material used in this example

[0038]

[0039] (2) Send the phosphate ore flotation tailings 6 to the high-efficiency thickener thickener 1, and the bottom dense phase 11 is sent to the filter 2 for filtration and separated into filter cake 12 and filtrate 17, and the filtrate 17 and the supernatant liquid 16 merge to form tailings Backwater 10 returns to the phosphate rock flotation unit; metered filter cake 12 and 25.02%P 2 o 5 Dilute phosphoric acid 7 is placed in the phosphoric acid leaching tank 3, the reaction temperature is controlled at 80-85°C, the stirring speed is 400r / min, and the reaction time is 70min, and the mixed slurry 13 is obtained after the phosphoric acid leaching reaction is sufficient; the measured mixed slurry 13 and ammonia 8 in the neutralization tank 4 until the pH value reaches 4.5-4.7 to obtain a neutralized slurry 14, and control the neutrali...

Embodiment 3

[0045] (1) The chemical composition (mass percentage %) of the phosphate rock flotation tailings raw material used in this example

[0046]

[0047] (2) The technological process and operation steps of this example are as follows:

[0048] The phosphate ore flotation tailings 6 are sent to the high-efficiency thickener thickener 1, and the bottom dense phase 11 is sent to the filter 2 for filtration and separated into filter cake 12 and filtrate 17, and the filtrate 17 and the upper clear liquid 16 are combined to form tailings backwater 10 Back to phosphate rock flotation unit; metered filter cake 12 and 30.63% P 2 o 5 Dilute phosphoric acid 7 is placed in the phosphoric acid leaching tank 3, the reaction temperature is controlled at 85-90°C, the stirring speed is 500r / min, and the reaction time is 60min, and the mixed slurry 13 is obtained after the phosphoric acid leaching reaction is sufficient; the measured mixed slurry 13 and ammonia 8 in the neutralization tank 4 u...

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