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Method for removing silicon from waste water discharged from coal water slurry gasification process

A coal-water slurry and wastewater technology, which is applied in chemical instruments and methods, water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems such as unsatisfactory removal of total silicon in effluent wastewater

Inactive Publication Date: 2019-08-30
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for removing silicon from the effluent of the coal-water slurry gasification process, so as to solve the problem of unsatisfactory removal of total silicon in the effluent of the coal-water slurry gasification process in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]The wastewater from the coal-water slurry gasification unit has a temperature of 40°C and a total silicon content of 989mg / L. Flow the above-mentioned effluent wastewater into the primary reaction coagulation tank, add slaked lime solution with a concentration of 2wt% to the effluent wastewater, and control the pH value of the effluent wastewater at 11 by controlling the dosage; add Concentration of 1wt% flocculant polyaluminum ferric chloride 5000mg / L, the two together with the effluent waste water will undergo reaction coagulation in the primary reaction coagulation tank, and enter the secondary reaction coagulation tank after staying for 60 minutes. Add cationic polyacrylamide to the secondary reaction coagulation tank, the dosage is 3mg / L, and 3wt% of the secondary sedimentation sludge discharged from the sedimentation tank, after flocculation and sedimentation occurs and stays for 60min, it enters the sedimentation tank. In the above process, the primary reaction co...

Embodiment 2

[0034] The wastewater from the coal-water slurry gasification unit has a temperature of 40°C and a total silicon content of 989mg / L. Flow the above-mentioned effluent wastewater into the primary reaction coagulation tank, add slaked lime solution with a concentration of 2wt% to the effluent wastewater, and control the pH value of the effluent wastewater at 10 by controlling the dosage; add Concentration of 1wt% flocculant polyaluminum ferric chloride 5000mg / L, the two together with the effluent waste water will undergo reaction coagulation in the primary reaction coagulation tank, and enter the secondary reaction coagulation tank after staying for 60 minutes. Add cationic polyacrylamide to the secondary reaction coagulation tank, the dosage is 3mg / L, and 3wt% of the secondary sedimentation sludge discharged from the sedimentation tank, after flocculation and sedimentation occurs and stays for 60min, it enters the sedimentation tank. In the above process, the primary reaction c...

Embodiment 3

[0037] The wastewater from the coal-water slurry gasification unit has a temperature of 40°C and a total silicon content of 989mg / L. Flow the above-mentioned effluent wastewater into the primary reaction coagulation tank, add slaked lime solution with a concentration of 2wt% to the effluent wastewater, and control the pH value of the effluent wastewater at 11.5 by controlling the dosage; add Concentration of 1wt% flocculant polyaluminum ferric chloride 5000mg / L, the two together with the effluent waste water will undergo reaction coagulation in the primary reaction coagulation tank, and enter the secondary reaction coagulation tank after staying for 60 minutes. Add cationic polyacrylamide to the secondary reaction coagulation tank, the dosage is 3mg / L, and 3wt% of the secondary sedimentation sludge discharged from the sedimentation tank, after flocculation and sedimentation occurs and stays for 60min, it enters the sedimentation tank. In the above process, the primary reaction...

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Abstract

The invention provides a method for removing silicon from waste water discharged from a coal water slurry gasification process. The silicon removal method comprises the following steps: step S1, adjusting the pH value of the effluent to 10-13, and flocculating the effluent with a flocculant to obtain a first-stage mixed waste water; step S2, performing coagulation treatment on that first-stage mixed waste water by using a coagulant aid to obtain the second-stage mixed waste water; step S3, carrying out sedimentation treatment on that second-stage mixed waste water to obtain secondary supernatant and secondary precipitated sludge, and returning at least part of the secondary precipitated sludge to the second-stage mixed waste water for auxiliary coagulation treatment in the step S2. The invention adjusts the pH value of the effluent to 10-13 before the flocculation treatment to facilitate the formation of alum flower between the dissolved silicon and the flocculant, thereby improving the flocculation efficiency of the dissolved silicon; at that same time, the secondary precipitate sludge obtained by circumfluence sedimentation in the step S2 is used as a contact medium to acceleratethe growth of the precipitate, improve the coagulation effect and improve the silicon removal effect.

Description

technical field [0001] The invention relates to the field of coal liquefaction wastewater treatment, in particular to a method for removing silicon from wastewater discharged from a coal-water slurry gasification process. Background technique [0002] At present, in the field of coal chemical industry, especially the pressurized gasification technology of coal water slurry, coal water slurry and pure oxygen are used as raw materials, and partial oxidation reaction is carried out under high temperature and high pressure conditions to generate crude synthesis gas with carbon monoxide and hydrogen as active components. In the process, in order to wash the impurities in the crude synthesis gas and reduce the temperature of the slag, waste water containing a certain amount of calcium, magnesium metal ions, suspended solids, ammonia nitrogen, etc. is produced. Especially when coal is used in the Zhundong region of Xinjiang, the silicon wastewater generated during the production pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10
CPCC02F1/5236C02F1/56C02F1/66C02F2101/10C02F2301/08
Inventor 刘义李玉林郑红飞杜善明关丰忠吴国祥肖杰
Owner CHNA ENERGY INVESTMENT CORP LTD
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