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A method for producing monoammonium phosphate by using medium and low-grade phosphate rock

A monoammonium phosphate, low-grade technology, applied in the direction of phosphate, phosphorus oxyacid, solid separation, etc., can solve unreported problems and achieve the effect of simple process steps and mild conditions

Active Publication Date: 2017-01-25
湖北宜化肥业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, none of the above have systematically reported on a series of processes such as phosphate ore blending, flotation, wet-process phosphoric acid purification, and monoammonium phosphate production.

Method used

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  • A method for producing monoammonium phosphate by using medium and low-grade phosphate rock

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Effect test

Embodiment 1

[0016] A method for producing monoammonium phosphate by utilizing medium and low-grade phosphate rocks, comprising the steps of:

[0017] 1) After mixing medium and low-grade high-magnesium phosphate rock with low-grade phosphate rock at a mass ratio of 4:1, P 2 o 5 The mass fraction of the phosphate rock mixture is 25-28%, and the phosphorus rock mixture is obtained after reverse flotation containing P 2 o 5 32% phosphate rock;

[0018] 2) Will contain P 2 o 5 32% phosphate rock is reacted with sulfuric acid to obtain phosphate pulp. Phosphate pulp is separated at 70-80°C and vacuum-filtered at -0.05~-0.08MPa to obtain phosphoric acid. After sedimentation and filtration, phosphoric acid enters the tubular reactor and ammonia The reaction yields monoammonium phosphate.

[0019] The collector in the reverse flotation process in the above-mentioned steps comprises the mixture of collector soap flakes and foaming agent with a mass ratio of 20:1, wherein the collector soap f...

Embodiment 2

[0022] A method for producing monoammonium phosphate by utilizing medium and low-grade phosphate rocks, comprising the steps of:

[0023] 3) Mix low-grade high-magnesium phosphate rock with low-grade phosphate rock at a mass ratio of 4:1 to obtain P 2 o 5 The mass fraction of the phosphate rock mixture is 25-28%, and the phosphorus rock mixture is obtained after reverse flotation containing P 2 o 5 32% phosphate rock;

[0024] 4) Will contain P 2 o 5 32% phosphate rock is reacted with sulfuric acid to obtain phosphate pulp. Phosphate pulp is separated at 70-80°C and vacuum-filtered at -0.05~-0.08MPa to obtain phosphoric acid. After sedimentation and filtration, phosphoric acid enters the tubular reactor and ammonia The reaction yields monoammonium phosphate.

[0025] The collector in the reverse flotation process in the above-mentioned steps comprises the mixture of collector soap flakes and foaming agent with a mass ratio of 10:1, wherein the collector soap flakes are l...

Embodiment 3

[0028] A method for producing monoammonium phosphate by utilizing medium and low-grade phosphate rocks, comprising the steps of:

[0029] 5) Mix low-grade high-magnesium phosphate rock with low-grade phosphate rock at a mass ratio of 4:1 to obtain P 2 o 5 The mass fraction of the phosphate rock mixture is 25-28%, and the phosphorus rock mixture is obtained after reverse flotation containing P 2 o 5 32% phosphate rock;

[0030] 6) Will contain P 2 o 5 32% phosphate rock is reacted with sulfuric acid to obtain phosphate pulp. Phosphate pulp is separated at 70-80°C and vacuum-filtered at -0.05~-0.08MPa to obtain phosphoric acid. After sedimentation and filtration, phosphoric acid enters the tubular reactor and ammonia The reaction yields monoammonium phosphate.

[0031] The collectors in the reverse flotation process in the above steps are 58 parts of fatty acid sulfoalkylamide, 14 parts of acetohydroxamic acid, 7.5 parts of titanium dioxide, 5.5 parts of cuprous oxide, and...

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Abstract

The invention relates to a method for producing monoammonium phosphate by utilizing medium and low grade phosphorus ore; the method specifically comprises the following steps: mixing medium and low grade high-magnesium phosphorus ore with low grade phosphorus ore at a mass ratio of 4:1 so as to obtain a phosphorus ore mixture, the P2O5 mass fraction of which is 25-28%, and carrying out reverse flotation of the phosphorus ore mixture to obtain phosphorus ore containing 32% of P2O5; and separating out phosphoric acid after filtering the phosphorus ore containing 32% of P2O5 in vacuum at high temperature, and reacting phosphoric acid with ammonia in a tubular reactor after settling and filtering so as to obtain monoammonium phosphate, wherein a collecting agent in the reverse flotation process comprises a mixture, the mass ratio of a collecting agent soap flake to a foaming agent in the mixture is 20:(1-3), the collecting agent soap flake is ketonic acid, oleic acid or linoleic acid, and the foaming agent is a composition of polyhydroxyl alkane and propylene oxide. By adopting the technical scheme provided by the invention, the recovery rate of monoammonium phosphate is 99.5%; the purity of the recovered monoammonium phosphate is of the food grade; and the method is simple in process step and moderate in condition and is applied to large-scale industrial production and application.

Description

technical field [0001] The invention relates to a method for producing monoammonium phosphate by using medium and low-grade phosphate rock. Background technique [0002] Li Zhiguo took the ore blending process of the phosphate rock flotation yard as the research object in the multi-objective optimal ore blending model of the phosphate rock stockyard, selected the quality index of the selected raw ore and the utilization of low-quality ore as the main objectives, and increased resource constraints and decision variables Based on non-negative constraints, a multi-objective optimization ore blending model of the stockyard was built. At the same time, the multi-objective programming solution function in the Matlab optimization toolbox was used to solve and verify the calculation example and the actual ore blending model, and compared with the on-site blending results, the blending The ore effect is obvious. The research results show that: the multi-objective optimization ore ble...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28B03D1/00
Inventor 宋万元黄安莲邹爽方娅兰魏旺玲蔡忠张战利王新娟何欣
Owner 湖北宜化肥业有限公司