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Method for on-line detection of molecular ratio of high-pressure digestion pulp produced in production of alumina

A technology of high-pressure dissolution and alumina, which is applied in the detection of the molecular ratio of the high-pressure dissolution pulp in the alumina production process, and in the field of on-line detection of the molecular ratio of the high-pressure dissolution pulp of alumina. The effect of reducing system fluctuations

Active Publication Date: 2018-03-06
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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AI Technical Summary

Problems solved by technology

Some alumina enterprises use the method of detecting the conductivity of the dissolution slurry to establish a soft-sensing model for the molecular ratio of the dissolution slurry. However, due to the unstable pressure after dissolution, bubbles will be generated during the flash evaporation process. The soft-sensing model needs to be adjusted frequently. The process cannot be used normally

Method used

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  • Method for on-line detection of molecular ratio of high-pressure digestion pulp produced in production of alumina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Such as figure 1 A method for on-line detection of the molecular ratio of alumina high-pressure stripping pulp is shown. The high-pressure stripping flash end tank 1 discharges the slurry for split flow, and 2-20% of the stripping slurry 5 enters the normal pressure flash tank 6 for thorough extraction. Flash to normal pressure; use the conductivity meter 8 to detect the conductivity of the stripping slurry after flashing to normal pressure online, use the thermocouple 7 to detect the temperature of the stripping slurry online, and combine chemical analysis to obtain the dissolution molecular ratio and conductivity and temperature The soft-sensing model of the relationship realizes the online detection of the molecular ratio of the high-pressure dissolution slurry.

[0016] The high-pressure dissolution temperature is 200~300°C.

[0017] The final tank pressure of high-pressure stripping and flash evaporation is 0.05~0.25MPa.

[0018] The exhausted steam 9 that splits...

Embodiment 2

[0022] Such as figure 1 A method for on-line detection of the molecular ratio of alumina high-pressure stripping pulp is shown. The high-pressure stripping flash end tank 1 discharges the slurry for split flow, and 2-20% of the stripping slurry 5 enters the normal pressure flash tank 6 for thorough extraction. Flash to normal pressure; use the conductivity meter 8 to detect the conductivity of the stripping slurry after flashing to normal pressure online, use the thermocouple 7 to detect the temperature of the stripping slurry online, and combine chemical analysis to obtain the dissolution molecular ratio and conductivity and temperature The soft-sensing model of the relationship realizes the online detection of the molecular ratio of the high-pressure dissolution slurry.

[0023] The high-pressure dissolution temperature is 200~300°C.

[0024] The final tank pressure of high-pressure stripping and flash evaporation is 0.05~0.25MPa.

[0025] The exhausted steam 9 split and f...

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Abstract

The invention relates to a detection method for the molecular ratio of high-pressure digestion pulp during production of alumina, especially to a method and apparatus for on-line detection of the molecular ratio of high-pressure digestion pulp produced in production of alumina. According to the method, pulp discharged from high-pressure-digestion flash-evaporation tail tank is diverted, and 2 to 20% of the digestion pulp enters a normal-pressure flash evaporation tank for thorough flash evaporation until a normal pressure is reached; then the conductivity of the digestion pulp which reaches the normal pressure through flash evaporation is detected on line by using a conductivity meter, and a thermocouple is used for on-line detection of the temperature of the digestion pulp; and chemical analysis is cooperatively carried out so as to obtain a soft measurement model for the relationship between the digestion molecular ratio molecular ratio and the conductivity and temperature, so on-line detection of the molecular ratio of high-pressure digestion pulp is realized. The method has the advantages that on-line continuous measurement of the high-pressure digestion pulp is realized; and ore blending for digestion can be timely adjusted according to measurement results, so equipment used in the procedure of digestion is allowed to efficiently operate, and system fluctuation is reduced.

Description

technical field [0001] The invention relates to a method for detecting the molecular ratio of high-pressure leached pulp in the alumina production process, in particular to an online detection method for the molecular ratio of the high-pressure leached pulp of alumina, which belongs to the technical field of alumina production. Background technique [0002] High-temperature dissolution is a key process in alumina production, and the dissolution index and effect determine the overall output and efficiency of the alumina plant. The molecular ratio of the dissolution slurry is a key indicator of the dissolution process. Due to the high temperature, high alkalinity and easy scarring characteristics of the dissolution process, this indicator has not yet been detected online. Currently, it is detected by chemical analysis after regular sampling. Sampling and analysis lead to a lag in production control and adjustment, resulting in inefficient operation of the dissolution process e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/00C01F7/02
CPCC01F7/02G01N25/00
Inventor 李来时刘涛涛杨琦
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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