Passivant for inhibiting iron and aluminium impurity acid split leaching of phosphorite and operation method thereof

A passivating agent and phosphate rock technology, applied in the field of acid hydrolysis of phosphate rock, can solve the problems of large acid consumption, difficult cleaning, easy clogging of equipment by sludge, etc., and achieve the effect of inhibiting leaching of iron and aluminum impurities and high leaching rate

Inactive Publication Date: 2009-10-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a passivator that can effectively inhibit the leaching of iron and aluminum impurities during the acid hydrolysis of phosphate rock, and to use the passivator to control the leaching of iron and aluminum impurities during the acid hydrolysis of phosphate rock. Process leaching process to solve the problem of acid hydrolysis of phosphate rock in the prior art due to the large amount of acid consumption and phosphorus loss caused by the large amount of iron and aluminum impurities entering the liquid phase, it is difficult to produce high-quality phosphoric acid from high-iron-aluminum phosphate rock, and The sludge formed by iron and aluminum impurities in the phosphoric acid storage tank is easy to block the equipment, and it is difficult to clean up and many other problems
[0005]

Method used

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  • Passivant for inhibiting iron and aluminium impurity acid split leaching of phosphorite and operation method thereof
  • Passivant for inhibiting iron and aluminium impurity acid split leaching of phosphorite and operation method thereof
  • Passivant for inhibiting iron and aluminium impurity acid split leaching of phosphorite and operation method thereof

Examples

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Example Embodiment

[0027] Example 1

[0028] Sodium hexametaphosphate 25w%, sodium nitrate 20w%, sodium tripolyphosphate 10w%, sodium hydrogen phosphate 20w%, 2-benzoyl 3-hydroxypropene 25w%.

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[0029] Example 2

[0030] Sodium tripolyphosphate 40w%, nitric acid 15w%, thiourea 45w%.

Example Embodiment

[0031] Example 3

[0032] Sodium trimetaphosphate 20w%, ammonium nitrate 15w%, sodium tripolyphosphate 20w%, zinc phosphate 15w%, o-xylylthiourea 30w%.

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Abstract

The invention discloses a passivant for inhibiting iron and aluminium impurity leaching during acid splitting process of phosphorite; the invention also discloses an operation method for controlling iron and aluminium impurity leaching of phosphorite by passivant. The passivant mainly comprises components distributed according to weight percentage as follows: 20-50%w of polyphosphates, 10-30w % of at least one selected from nitric acid, nitrate and acetic acid, and 30-60%w of sulfur nitrogen compound. The method for controlling iron and aluminium impurity leaching of phosphorite by passivant comprises adding passivant with a weight content which is not larger than that of sesquioxide R2O3 in the phosphorite during the acid splitting process of the phosphorite. The passivant of the invention is used in acid splitting process of phosphorite to effectively inhibit iron and aluminium impurity leaching while maintaining a high leaching rate of effective phosporus component, thereby solving a plurality of problems caused by entering of excess iron and aluminium impurity into the liquid phase in the acid splitting process of phosphorite of prior art.

Description

technical field [0001] The present invention relates to the technical field of phosphate rock acid hydrolysis, more specifically, relates to a passivating agent capable of inhibiting the leaching of iron and aluminum impurities in phosphate rock during the acid hydrolysis reaction process of phosphate rock, and using the passivator to control the iron and aluminum in phosphate rock The method of impurity leaching. Background technique: [0002] With the massive development of the phosphorus chemical industry, high-grade phosphate rock resources are gradually being exhausted. In order to maintain the survival and development of phosphorus chemical enterprises and meet people's demand for phosphorus chemical products, countries all over the world are scrambling to develop and utilize low-grade and medium-grade phosphate rock resources. New technology for phosphate rock. The inventor of the present invention has been paying attention to the development and utilization of low- ...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/08C23C22/23
CPCY02P10/20
Inventor 刘代俊杨军
Owner SICHUAN UNIV
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