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Inhibitor for controlling potassium and sodium in phosphate concentrate to enter phosphoric acid

A technology of inhibitors and phosphate concentrates, applied in the direction of phosphorus compounds, inorganic chemistry, chemical instruments and methods, etc., can solve undiscovered problems, achieve the effect of improving recovery rate, improving economic benefits, and cost control

Active Publication Date: 2019-09-17
YIDU XINGFA CHEM COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The idea of ​​the present invention is to use inhibitors to replace potassium- and sodium-containing ores to participate in the reaction without any impact on the decomposition of phosphorus-containing minerals. So far, the inventor has not found any reports on this research direction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the process of dihydrate wet phosphoric acid, inhibitors are used to control the amount of potassium and sodium entering phosphoric acid. The grade of phosphorus concentrate used in this example is: P 2 o 5 32.23w%, MgO 0.75w%, Al 2 o 3 2.63w%, Fe 2 o 3 1.52w%, K 2 O 1.15w%, Na 2 O 0.92w%, F3.10w%. Concentrate 100 grams, P 2 o 5 150 grams of 24w% dilute phosphoric acid, 90 grams of 98% concentrated sulfuric acid, adding inhibitors and no inhibitors, respectively controlling the temperature at 70-80 ° C for 3 hours, filtering and analyzing phosphoric acid and gypsum respectively, K 2 The amount of O decomposed into phosphoric acid accounts for 59% to 66% of the total content in the concentrate, and Na 2 O decomposes into phosphoric acid, which accounts for 60% to 67% of the total content in the concentrate, and P 2 o 5 The decomposition rate is 99%. In the comparative experiment, 14 grams of inhibitors were added before the reaction, and the inhibitor...

Embodiment 2

[0025] This example is the use of inhibitors to control the amount of potassium and sodium entering phosphoric acid in the semi-water-dihydrate wet-process phosphoric acid process. The grade of phosphorus concentrate used in this example is: P 2 o 5 32.75w%, MgO 0.76w%, Al 2 o 3 2.51w%, Fe 2 o 3 1.36w%, K 2 O 1.01w%, Na 2 O0.87w%, F3.07w%. Concentrate 100 grams, P 2 o 5 100 grams of 37w% dilute phosphoric acid, 90 grams of 98% concentrated sulfuric acid, adding inhibitors and no inhibitors, respectively controlling the temperature at 95-100 ° C for 3 hours, filtering and analyzing phosphoric acid and gypsum respectively, K 2 The amount of phosphoric acid decomposed by O accounts for 74% to 78% of the total content in the concentrate, the amount of phosphoric acid decomposed by Na2O accounts for 74% to 77% of the total content in the concentrate, and the decomposition rate of P2O5 is 99%. In the comparative experiment, 16 grams of inhibitors were added before the ...

Embodiment 3

[0027] This example is the use of inhibitors to control the amount of potassium and sodium entering phosphoric acid in the semi-aqueous wet-process phosphoric acid process. The grade of phosphorus concentrate used in this example is: P 2 o 5 32.55w%, MgO 0.73w%, Al 2 o 3 2.41w%, Fe 2 o 3 1.40w%, K 2 O 0.98w%, Na 2 O0.91w%, F3.01w%. Concentrate 100 grams, P 2 o 5 100 grams of 38w% dilute phosphoric acid, 90 grams of 98% concentrated sulfuric acid, adding inhibitors and no inhibitors, respectively controlling the temperature at 90-100 ° C for 3 hours, filtering and analyzing phosphoric acid and gypsum respectively, K 2 The amount of O decomposed into phosphoric acid accounts for 80% to 83% of the total content in the concentrate, and Na2 The amount of O decomposed into phosphoric acid accounts for 75% to 79% of the total content in the concentrate, and P 2 o 5 The decomposition rate is 99%. In the comparative experiment, 18 grams of inhibitors were added before t...

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Abstract

The invention discloses an inhibitor for controlling potassium and sodium in phosphate concentrate to enter phosphoric acid and an application method for controlling potassium and sodium in phosphate concentrate to enter phosphoric acid after acidolysis by using the inhibitor, which are suitable for a process for preparing wet-process phosphoric acid from fluorapatite phosphate concentrate with high content of Al2O3, K2O and Na2O. The inhibitor mainly comprises the following components in percentage by weight: 40-100% of SiO2, 0-50% of CaO and 0-10% of Al2O3. The inhibitor is added in the wet-process phosphoric acid acidolysis process, the addition amount of the inhibitor is calculated by the weight of SiO2, and the addition amount is calculated by the weight of F and SiO2 in the phosphate concentrate. By adopting the inhibitor and the application method in the acidolysis process of the phosphate concentrate, potassium and sodium impurities can be effectively controlled to enter a phosphoric acid system under the condition of ensuring that phosphorus-containing components are fully decomposed, the quality of phosphoric acid can be well improved, and the scale formation of the system can be effectively relieved. According to the invention, the utilization rate of the medium and low grade phosphorite with high potassium and sodium content can be obviously improved.

Description

technical field [0001] The invention relates to an inhibitor for controlling the entry of potassium and sodium into phosphoric acid in phosphate concentrate and its application method, which belongs to the field of wet phosphoric acid production from phosphate rock, and in particular relates to a method capable of controlling potassium, sodium, and potassium in phosphate concentrate during acidolysis. An inhibitor for controlling the decomposition of sodium minerals into phosphoric acid, and a method for using the inhibitor to control the entry of potassium and sodium into phosphoric acid in phosphate concentrate. Background technique [0002] Wet-process phosphoric acid is an important intermediate product for the production of ammonium phosphate, compound fertilizer, and refined phosphoric acid. Therefore, it is particularly critical to stabilize the production process of wet-process phosphoric acid and ensure the quality of phosphoric acid. However, with the continuous re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/222
CPCC01B25/222
Inventor 李防郑光明刘兵兵邹学勇沈维云孙桦林王旭东
Owner YIDU XINGFA CHEM COMPANY
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