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Acid pickling method of calcified clinker

A technology of calcified clinker and acid leaching, applied in the field of metallurgy, can solve the problems of limited site conditions, slow reaction, intense reaction, etc., and achieve the effect of ensuring the dissolution rate

Active Publication Date: 2019-01-22
PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in practical applications, the content of total vanadium and acid-soluble vanadium in calcified clinker changes and the ambient temperature changes. Controlling according to the inherent operating parameters will lead to uncontrollable leaching temperature during the acid leaching process of calcified clinker. Insufficient thermodynamic conditions, the reaction is slow, and a large amount of vanadium cannot be dissolved; if the temperature is too high, the reaction will be intense, and the vanadium will be dissolved and precipitated immediately, resulting in high vanadium content in the acid leaching residue, low vanadium yield, and the vanadium leaching rate is less than 90%.
Especially in summer, when the ambient temperature is too high, vanadium can be precipitated by vanadium leaching, and the vanadium content of the acid leaching residue can reach more than 7%; in winter, the ambient temperature is too low, and the temperature of the acid leaching system cannot meet the process requirements, and steam heating is required. But the site conditions are limited
When the system or / and T 环境 When the change is large, the reaction pH of the acid leaching system may be lower than 2.3 or higher than 3.2, and the reaction temperature of the system may be lower than 45°C or higher than 60°C according to the above-mentioned conventional process control, which will lead to incomplete leaching reaction or vanadium precipitation. occurs, the vanadium leaching rate of calcified clinker is below 90% or lower

Method used

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  • Acid pickling method of calcified clinker
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  • Acid pickling method of calcified clinker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 clinker or / and T 环境 <10℃(low temperature)

[0052] The clinker property parameter R is 0.73 and / or the ambient temperature is 7°C.

[0053] The amount of mother liquor and the amount of clinker are set at a liquid-solid ratio of 1.9 (the amount of mother liquor L is 15m 3 , clinker amount S is 8 tons) mixed to obtain acid leaching slurry;

[0054] Sulfuric acid with a mass concentration of 73.4% was slowly added dropwise to the above-mentioned slurry in 6 minutes, and the pH of the slurry was reduced to 2.3-2.5, and leached at a constant pH and temperature for 90 minutes;

[0055] Through the above operations, the temperature of the acid leaching system rose to 52.48°C in 6 minutes.

[0056] The leaching rate of clinker obtained in this embodiment is 97.45%. If it is leached according to the conventional method, the temperature of the acid leaching system is as high as 32.57°C, and the obtained vanadium leaching rate is 82.57%.

Embodiment 2

[0057] Example 2 without 0.85 or / and T 环境 =10~20℃ excluding 20℃(medium temperature)

[0058] The clinker property parameter R is 0.83 and / or the ambient temperature is 15°C.

[0059] The amount of mother liquor and the amount of clinker are based on a liquid-solid ratio of 2.3 (the amount of mother liquor L is 16.5m 3 , clinker amount S is 7.2 tons) mixed to obtain acid leaching slurry;

[0060] Sulfuric acid with a mass concentration of 55.09% was slowly added dropwise to the above slurry in 13 minutes to reduce the pH of the slurry to 2.5-2.7, and leached at a constant pH and temperature for 65 minutes;

[0061] Through the above operations, the temperature of the acid leaching system rose to 53.17°C in 13 minutes.

[0062] The leaching rate of clinker obtained in this embodiment is 98.36%. If it is leached according to the conventional method, the temperature of the acid leaching system is as high as 43.63°C, and the obtained vanadium leaching rate is 93.59%.

Embodiment 3

[0063] Example 3 or / and T 环境 >30℃(high temperature)

[0064] The clinker property parameter R is 0.93 and / or the ambient temperature is 34°C.

[0065] The amount of mother liquor and the amount of clinker are calculated according to the liquid-solid ratio of 3.2 (the amount of mother liquor L is 17.5m 3 , clinker amount S is 5.5 tons) mixed to obtain acid leaching slurry;

[0066] Sulfuric acid with a mass concentration of 31.51% was slowly added dropwise to the above slurry in 24 minutes to reduce the pH of the slurry to 2.9-3.1, and leached at a constant pH and temperature for 30 minutes;

[0067] Through the above operations, the temperature of the acid leaching system rose to 54.57°C in 24 minutes.

[0068] The leaching rate of clinker obtained in this embodiment is 98.65%. If it is leached according to the conventional method, the temperature of the acid leaching system can be as high as 67.61°C, and the obtained vanadium leaching rate is 73.59%.

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Abstract

The invention belongs to the field of metallurgy, and particularly relates to an acid pickling method of calcified clinker. Aiming at solving the technical problem, the invention provides the acid pickling method of the calcified clinker. In the acid pickling method, according to the different specific values of acid-soluble vanadium amounts to total vanadium amounts in roasted clinker and ambienttemperatures, the proper temperature rise rate is controlled; thus, the proper liquid-solid ratio of a mother liquor amount to a clinker amount is further controlled and the factors of a pH (potential of Hydrogen) change rate and the like are controlled; and therefore, the acid pickling rate of calcified and roasted clinker is enabled to be up to 95% or above.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to an acid leaching method for calcified clinker. Background technique [0002] The "vanadium oxide clean production process" adopts the process flow of vanadium slag "calcification roasting-sulfuric acid leaching-acid precipitation". In the process of sulfuric acid leaching to produce clean vanadium, the acid leaching reaction temperature is uncontrollable due to the properties of calcified clinker and changes in the external environment. Thus affecting the acid leaching effect. [0003] The existing technology only optimizes the acid leaching reaction parameters for calcified clinker with specific total vanadium and acid-soluble vanadium content. The acid leaching reaction heat generated by it is constant, the acid leaching reaction temperature is relatively stable, and the entire leaching process is highly controllable. , The vanadium leaching rate is 95-97%. The acid leac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B34/22
CPCC22B3/08C22B34/22Y02P10/20
Inventor 王进杨兵熊开伟张林
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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