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Deep purification method of feed-grade wet-process phosphoric acid

A wet-process phosphoric acid, deep purification technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of phosphoric acid product quality decline, high energy consumption, solvent loss, etc.

Active Publication Date: 2016-12-07
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are prominent problems in wet-process phosphoric acid: with the depletion of phosphate rock grade, the impurity content in phosphate rock is increasing. During the extraction reaction process between sulfuric acid and phosphate rock, such as Al 3+ , Mg 2+ , F - Harmful impurities and other harmful impurities enter the phosphoric acid extract together, resulting in a decline in the quality of phosphoric acid products
Disadvantages: high phosphorus loss rate, insufficient purification depth, and the introduction of other ions at the same time, bringing new troubles to deep purification
Disadvantages: The separation of phosphoric acid and solvent requires distillation, which consumes a lot of energy (except for back extraction with alkali), and there is a certain loss during solvent recovery, and the removal rate of impurities is not high

Method used

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  • Deep purification method of feed-grade wet-process phosphoric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 10 tons of dilute acid in the aging tank, add wet-process phosphoric acid purification agent inorganic salt I (sodium fluoride, 41kg), inorganic salt II (potassium carbonate, 103kg), inorganic salt III (potassium sulfate, 69kg), inorganic salt IV (calcium bicarbonate, 11kg), the temperature of phosphoric acid is 28°C, the reaction time is 10min, and the stirring rate is 44r / min. After treatment, the removal rates of aluminum phosphate and magnesium in wet process reach 97.19% and 72.68%, respectively. After hot air exchange, the mass ratio of phosphorus to fluorine is 420, P 2 o 5 The recovery rate is 98.9%.

Embodiment 2

[0024] Get 10 tons of dilute acid in the aging tank, add wet-process phosphoric acid deep purification agent inorganic salt I (sodium fluoride, 30kg; magnesium fluoride, 125kg), inorganic salt II (ammonium carbonate, 54kg), inorganic salt III (sulfuric acid Sodium, 77kg), inorganic salt IV (calcium phosphate, 15kg), the temperature of phosphoric acid is 29°C, the reaction time is 15min, and the stirring rate is 106r / min. After treatment, the removal rates of wet-process aluminum phosphate and magnesium reached 97.54% and 71.33%, respectively. After hot air exchange, the fluorine P 2 o 5 / F is 452, P 2 o 5 The recovery rate is 99.1%.

Embodiment 3

[0026] Take 10 tons of dilute acid in the aging tank, add wet-process phosphoric acid deep purification agent inorganic salt I (hydrogen fluoride, 109kg; beryllium fluoride, 1kg), inorganic salt II (potassium carbonate, 33kg; sodium carbonate, 102kg), inorganic salt III (potassium sulfate, 8kg; ammonium sulfate, 56kg; magnesium sulfate, 39kg), inorganic salt IV (calcium dihydrogen phosphate, 21kg), the phosphoric acid temperature is 24°C, the reaction time is 16min, and the stirring rate is 64r / min. After treatment, the removal rates of wet-process aluminum phosphate and magnesium reached 98.14% and 71.33%, respectively. After hot air exchange, the mass ratio of phosphorus to fluorine is 435, P 2 o 5 The recovery rate is 98.8%.

[0027] If the four inorganic salts are reduced to three or two, the test results are shown in Table 1.

[0028]

[0029] As can be seen from Table 1, only the four kinds of salt mixtures provided by the present invention can be used to deeply pu...

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Abstract

The invention discloses a deep purification method of feed-grade wet-process phosphoric acid. According to the deep purification method, inorganic salt I, inorganic salt II, inorganic salt III and inorganic salt IV are combined with aluminum and magnesium ions in wet-process phosphoric acid to generate indissolvable compound inorganic salt to be precipitated, aluminum and magnesium impurities are removed, and then fluorine is removed, thereby realizing the deep purification of wet-process phosphoric acid. According to a novel deep purification process of feed-grade wet-process phosphoric acid, aluminum, magnesium and fluorine can be removed from phosphoric acid by a wet process, so that the index requirements of raw material acid for producing feed calcium salt or high-concentration phosphatic fertilizers, soluble fertilizers and industrial grade phosphate products are met; and no new impurity ion is introduced into purified phosphate.

Description

technical field [0001] The invention belongs to the technical field of wet-process phosphoric acid treatment, and in particular relates to a deep purification method for feed-grade wet-process phosphoric acid. Background technique [0002] my country is rich in phosphate rock resources, and its reserves rank second in the world, second only to Morocco. Although the total reserves of phosphate rock in my country are very large, most of them belong to low-grade ore, and the ore contains a lot of impurities, which is a typical type of refractory low-activity phosphate rock. Wet-process phosphoric acid is an important intermediate product for the production of phosphate products, and provides important raw materials for phosphorus chemical industry, metallurgy, medicine, food, military industry and other industries. At present, there are two main production methods of phosphoric acid: thermal method and wet method. The first thermal phosphoric acid is to use the electric furna...

Claims

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Application Information

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IPC IPC(8): C01B25/238
CPCC01B25/2375C01B25/238
Inventor 张晖何宾宾周琼波
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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