Method for clearing pipelines in manufacturing process of aluminium oxide

A technology of production process and cleaning method, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of reduced equipment capacity, material waste, damage to the surrounding environment, etc., and achieve the effect of recycling.

Inactive Publication Date: 2009-11-18
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] One of the biggest production bottlenecks in alumina production is the scarring of pipelines in the wet production process, and most of the scarring components are Na 2 O, Al 2 o 3 , SiO 2 and crystallized water, due to scarring, the pipeline transportation capacity is reduced, and the equipment capacity is reduced
In the past, almost all pipeline cleaning methods were manually cleaned, which not only made it difficult to guarantee safety, but also caused fluctuations in production due to cleaning activities, which reduced the operation rate of equipment, caused waste of materials, increased production costs, and caused damage to the surrounding environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] For the cleaning of the semen pipeline in alumina production, the leaf filter is used to boil the lye storage tank, the semen pump, and the two feeding semen pipelines are connected to form a closed loop. The lye in the lye tank is prepared by mixing the mother liquor and liquid caustic soda, and the Nk concentration of the lye is controlled at 155g / L. The circulating lye in the lye tank is heated by steam to keep its temperature at 103°C. After the semen pump is started and the lye circulates normally, the height of the lye tank is 2.0 meters to keep the circulating pump with sufficient lift so that the flow rate of the lye circulating in the semen pipeline is 1.0m / s. As the time of circulating lye prolongs, take samples in time to analyze the concentration of lye, replenish lye regularly, and keep the Nk concentration of circulating lye greater than 155g / L. After 5 days of operation, the cleaning of the semen duct was completed. After segmental inspection of the sem...

Embodiment 2

[0022] For the cleaning of the semen pipeline in alumina production, the leaf filter is used to boil the lye storage tank, the semen pump, and the two feeding semen pipelines are connected to form a closed loop. The lye in the lye tank is prepared by mixing the mother liquor and liquid caustic soda, and the Nk concentration of the lye is controlled at 170g / L. The circulating lye in the lye tank is heated by steam to keep its temperature at 93°C. After the semen pump is started and the lye circulates normally, the height of the lye tank is 4.0 meters to keep the circulating pump with sufficient head, so that the flow rate of the lye circulating in the semen pipeline is 3m / s. As the time of circulating lye prolongs, take samples in time to analyze the concentration of lye, replenish lye regularly, and keep the Nk concentration of circulating lye greater than 155g / L. After 5 days of operation, the cleaning of the semen duct was completed. After segmental inspection of the semen...

Embodiment 3

[0024] For the cleaning of the semen pipeline in alumina production, the leaf filter is used to boil the lye storage tank, the semen pump, and the two feeding semen pipelines are connected to form a closed loop. The lye in the lye tank is prepared by mixing the mother liquor and liquid caustic soda, and the Nk concentration of the lye is controlled at 160g / L. The circulating lye in the lye tank is heated by steam to keep its temperature at 100°C. After the semen pump is started and the lye circulates normally, the height of the lye tank is 3.0 meters to keep the circulating pump with sufficient lift so that the flow rate of the lye circulating in the semen pipeline is 2m / s. As the time of circulating lye prolongs, take samples in time to analyze the concentration of lye, replenish lye regularly, and keep the Nk concentration of circulating lye greater than 155g / L. After 5 days of operation, the cleaning of the semen duct was completed. After segmental inspection of the semen...

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Abstract

The invention provides a method for clearing pipelines in the manufacturing process of aluminium oxide, which is applicable to the clearance of scars generated in the pipeline transportation section in the manufacturing process of aluminium oxide, in particular to the method for clearing the scars inside the pipelines. The clearing process is characterized in that the pipeline is full of floating NaOH alkali liquor with the temperature of 93-103 DEG C in the clearing process; the NaOH alkali liquor dissolves the scars in the pipelines and the scars can be cleared by the floating and eroding of the alkali liquor. The wet clearing method of pipelines in the process of manufacturing the aluminium oxide by the sintering method can realize scar decomposition and return to the flow by utilizing the principle that alkali solution with certain temperature, concentration and flow rate can dissolve the scars, thus realizing the recycling of the pipelines for transmitting materials in the manufacturing process of the aluminium oxide and improving production capability and device productivity.

Description

technical field [0001] The invention relates to a method for cleaning pipelines in the alumina production process, which is suitable for cleaning the scabs generated in the transmission part of the alumina production pipelines, and is especially aimed at cleaning the scabs inside the pipelines. Background technique [0002] One of the biggest production bottlenecks in alumina production is the scarring of pipelines in the wet production process, and most of the scarring components are Na 2 O, Al 2 o 3 , SiO 2 And crystallized water, due to scarring, the pipeline transportation capacity is reduced, and the equipment capacity is reduced. In the past, almost all pipeline cleaning methods were manually cleaned, which not only made it difficult to guarantee safety, but also caused fluctuations in production due to cleaning activities, which reduced the operation rate of equipment, caused waste of materials, increased production costs, and caused damage to the surrounding envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/14C01F7/02
Inventor 孙建峰邹荣玉崔华锋任云翔熊卫东秦国红冯国政李习杰王国宾贺东联
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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