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Rapid heating extraction method of extraction tank

An extraction tank and extraction technology, used in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of production stagnation, reduced production of compound fertilizer systems, and long heating time of extraction tanks, etc. The concentration time is fast and the effect of saving heating and concentration time

Active Publication Date: 2014-01-08
山东聊城鲁西化工第五化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the extraction tank takes a long time to heat up, which will force the compound fertilizer system to reduce production in advance and cause production stagnation

Method used

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  • Rapid heating extraction method of extraction tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 , the extraction tank shown in , after cleaning the extraction tank, add 140 cubic meters of light phosphoric acid with a concentration of 1 to 19% to the 1.5m of the extraction tank, turn on the stirring in each area of ​​the extraction tank and the exhaust fan, and keep the extraction tank slightly negative Pressure 300pa, at 3m 3 / h speed and at 5m 3 Add 93% sulfuric acid and 29% phosphorous pulp to the extraction tank at a speed of 1 / h to raise the temperature and increase the concentration. The volume ratio of sulfuric acid and phosphorous pulp is 1:1.6. 3 Concentration value, get SO 3 The concentration is 0.020g / ml, increase the adding speed of sulfuric acid to 5m 3 / h, SO 3 When the concentration is 0.028g / ml, the adding speed of callback sulfuric acid is 3m 3 / h; At this time, the specific gravity of the extracted phosphoric acid is 1.20g / cm 3 , add 80 cubic meters of 1-19% light phosphoric acid, so that the specific gravity of the extract...

Embodiment 2

[0020] After the extraction tank is cleaned up, add 140 cubic meters of light phosphoric acid with a concentration of 1 to 19% to the 1.5m of the extraction tank, turn on the stirring and exhaust fans in each area of ​​the extraction tank, and keep a slight negative pressure of 500pa in the extraction tank. 3 / h speed and at 5m 3 Add 93% sulfuric acid and 29% phosphorous pulp to the extraction tank at a speed of 1 / h to raise the temperature and increase concentration. The volume ratio of sulfuric acid and phosphorous pulp is 1:1.5. 3 Concentration value, get SO 3 The concentration is 0.036g / ml; the specific gravity of the extracted phosphoric acid is 1.28g / cm 3 , adding 50 cubic meters of sewage from the cleaning and filtration system, so that the specific gravity of the extracted phosphoric acid is 1.23g / cm 3 , the extraction bath is located at 2.9m.

[0021] When the extraction temperature reaches 60 degrees, adjust the negative pressure of the exhaust fan to 1500pa, with...

Embodiment 3

[0023] Such as figure 1 , the extraction tank shown in , after cleaning the extraction tank, add 140 cubic meters of light phosphoric acid with a concentration of 1 to 19% to the 1.5m of the extraction tank, turn on the stirring in each area of ​​the extraction tank and the exhaust fan, and keep the extraction tank slightly negative Pressure 400pa, at 3m 3 / h speed and at 5m 3 Add 93% sulfuric acid and 29% phosphorous pulp to the extraction tank at a speed of 1 / h to raise the temperature and increase concentration. The volume ratio of sulfuric acid and phosphorous pulp is 1:1.5. 3 Concentration value, get SO 3 The concentration is 0.021g / ml, increase the adding speed of sulfuric acid to 5m 3 / h,SO 3 When the concentration is 0.029g / ml, the adding speed of callback sulfuric acid is 3m 3 / h; At this time, the specific gravity of the extracted phosphoric acid is 1.20g / cm 3 , add 80 cubic meters of 1-19% light phosphoric acid, so that the specific gravity of the extracted ph...

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Abstract

The invention discloses a rapid heating extraction method of an extraction tank. The method comprises the steps: (1) after the extraction tank is cleared, complementing dilute phosphoric acid to a 1.5m position in the extraction tank; (2) starting stirring fans and tail gas fans in all regions, and keeping the extraction tank at micro-negative pressure; (3) respectively adding sulfuric acid and phosphoric ore pulp into the extraction tank at the speeds of 3m<3> / h and 5m<3> / h, heating and thickening, wherein the dilute phosphoric acid or sewage is complemented again into the heating process so that the liquid level of the extraction tank and the proportion of the extracted phosphoric acid are controlled; (4) when the extraction temperature is up to 60 DEG C, adjusting the negative pressure value of each tail gas fan, gradually increasing the adding amounts of the sulfuric acid and the phosphoric ore pulp, and shortening the heating and thickening times of the extraction tank; and (5) when the liquid level and all indexes of the extraction tank meet a filtrations condition, filtering and washing, collecting solids into a gypsum stockpile, collecting liquid into a phosphoric acid tank, and exhausting tail gas after the tail gas is washed and emptied by using a washing tower. The rapid heating extraction method has the advantages that the heating and thickening times are saved, reducing the production costs of enterprises is reduced, extraction reaction effect is good and the like.

Description

technical field [0001] The invention relates to a method for rapidly raising the temperature of an extraction tank, in particular to a method for rapidly raising the temperature of phosphoric acid extraction in industrial production. Background technique [0002] At present, in the process of cleaning the scale of the extraction tank, in order to ensure the stable control of the extraction rate, the cleaning cycle of the extraction tank has been formulated, and the extraction tank needs to be cleaned 3-4 times a year. For some light phosphoric acid and sewage, the temperature in the extraction tank is about 30 degrees, and steam needs to be added to raise the temperature. When the temperature rises to 60 degrees, a small amount of sulfuric acid and phosphate rock slurry are added to the extraction tank to increase the temperature and extract the concentration of phosphoric acid. However, the steam contains a lot of condensed water. The entry of a large amount of condensed wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/222
Inventor 孙海兵王广辉魏茂松于海徐斌
Owner 山东聊城鲁西化工第五化肥有限公司
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