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Chemical cleaning agent for alumina production pipeline scale

A technology of cleaning agent and aluminum oxide, which is applied in the direction of detergent composition, chemical instruments and methods, non-surface active detergent composition, etc., can solve problems such as pipeline blockage, and achieve small impact on equipment, good effect and thorough cleaning Effect

Active Publication Date: 2010-04-07
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a chemical cleaning agent for effectively dissolving scaling of multiphase complex aluminum compounds, improving equipment efficiency, and solving the problem of pipeline blockage in alumina production pipelines.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Cleaning the fouling of the material phase of the spiral plate heat exchanger used in the production of the Bayer process

[0010] The percentage by weight of the chemical cleaning agent of preparation alumina production pipeline fouling consists of: hydrochloric acid (12%), urotropine (6%), thiourea (4%), cupric chloride (2%), hydrogen fluoride (0.02 %) water, and the balance is water. The inlet and outlet of the material phase of the spiral plate heat exchanger are separated from the original process by a plug-in plate, and the inlet and outlet of cleaning agent are installed at the inlet and outlet respectively. The cleaning is started by the acid-resistant pump circulation method, and the cleaning is analyzed every half an hour during the cleaning period. If the concentration of hydrochloric acid is lower than 8%, add cleaning agent, and stop cleaning when the concentration difference between two adjacent analyzes is lower than 0.2%, and the residual cleaning soluti...

Embodiment 2

[0012] Cleaning the fouling of the material phase of the spiral plate heat exchanger used in the production of the Bayer process

[0013] The weight percentage of the chemical cleaning agent for preparing alumina production pipeline scaling is composed of: 18% hydrochloric acid, 8% urotropine, 7% thiourea, 5% copper chloride, 0.01% hydrogen fluoride, and the balance is water.

[0014] The inlet and outlet of the material phase of the spiral plate heat exchanger are separated from the original process by a plug-in plate, and the inlet and outlet of cleaning agent are installed at the inlet and outlet respectively. The cleaning is started by the acid-resistant pump circulation method, and the cleaning is analyzed every half an hour during the cleaning period. If the concentration of hydrochloric acid is lower than 8%, add cleaning agent, and stop cleaning when the concentration difference between two adjacent analyzes is lower than 0.2%, and the residual cleaning solution is neut...

Embodiment 3

[0016] Cleaning the fouling of the material phase of the spiral plate heat exchanger used in the production of the Bayer process

[0017] The weight percentage of the chemical cleaning agent for preparing alumina production pipeline scaling is composed of: 10% hydrochloric acid, 7% urotropine, 5% thiourea, 3% copper chloride, 0.02% hydrogen fluoride, and the balance is water.

[0018] The inlet and outlet of the material phase of the spiral plate heat exchanger are separated from the original process by a plug-in plate, and the inlet and outlet of cleaning agent are installed at the inlet and outlet respectively. The cleaning is started by the acid-resistant pump circulation method, and the cleaning is analyzed every half an hour during the cleaning period. If the concentration of hydrochloric acid is lower than 8%, add cleaning agent, and stop cleaning when the concentration difference between two adjacent analyzes is lower than 0.2%, and the residual cleaning solution is neut...

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PUM

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Abstract

The invention provides a chemical cleaning agent for alumina production pipeline scale, and relates to a chemical cleaning formulation applicable to multi-phase complex aluminum compound scale. The agent is characterized by comprising the following components in percentage by weight: 8 to 18 percent of hydrochloric acid, 6 to 8 percent of urotropine, 4 to 7 percent of thiourea, 2 to 5 percent of copper chloride, 0.01 to 0.02 percent of hydrogen fluoride, and the balance of water. The chemical cleaning agent for alumina production pipeline scale has the advantages of using the hydrochloric acid as a main solvent to dissolve main scale, using the urotropine, the thiourea and the copper chloride as corrosion inhibitors to prevent corrosion on equipment and using the hydrogen fluoride as surfactant to activate multi-phase complex aluminum compound scale substances difficult to dissolve, along with raw materials easy to purchase, few impact on equipment, thorough cleaning and good effects.

Description

technical field [0001] The invention discloses a chemical cleaning agent for fouling of alumina production pipelines, and relates to a chemical cleaning formula suitable for multiphase complex aluminum compound scaling. Background technique [0002] At present, in the alumina production process, the solution containing sodium aluminate will spontaneously decompose, and form complex aluminum compound scaling with other components in the solution, resulting in a series of problems such as equipment efficiency decline and pipeline blockage, while the commonly used chemical cleaning method and cleaning agent, it is difficult to clean the scale, and the equipment performance cannot be fully utilized. Contents of the invention [0003] The object of the present invention is to address the shortcomings of the above-mentioned prior art, and provide a chemical cleaning agent that effectively dissolves scales of multi-phase complex aluminum compounds, improves equipment efficiency, ...

Claims

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Application Information

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IPC IPC(8): C11D7/34C11D7/60C23G1/04
Inventor 任巨金张继荣张广曹晓东杨伟立蔡永明刘善芳崔金驹杨俊丙谢长胜
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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