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Silicon removal method for wastewater discharged by aerospace furnace gasification process

A waste water and process technology, which is applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems that the long-term operation of the system cannot be guaranteed, and the total silicon in the discharged waste water does not meet the standard, so as to meet the requirements Environmental protection and production management, reducing sewage treatment costs, and obvious effects

Pending Publication Date: 2021-03-30
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem in the prior art that the total silicon in the waste water discharged from the gasification process of the space furnace is not up to the standard and the long-term operation of the system cannot be guaranteed, the invention provides a method for removing silicon from the waste water discharged from the gasification process of the space furnace, and specifically relates to a method for Chemical industry, coal-fired power plants, coal mines and other silicon-containing sewage are solidified and removed before their silicon ions are discharged or recycled to meet the environmental protection requirements of external drainage and the process stability of circulating water

Method used

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  • Silicon removal method for wastewater discharged by aerospace furnace gasification process
  • Silicon removal method for wastewater discharged by aerospace furnace gasification process
  • Silicon removal method for wastewater discharged by aerospace furnace gasification process

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The ash water from the gasification unit of the aerospace furnace has a temperature of 75°C and a total silicon content of 260mg / L. Add liquid caustic soda to the wastewater in the pipeline to adjust the pH to 10, and then transfer the alkali-adjusted water to Reactor 1 for the reaction of adding magnesium agent, the reaction time is 30 minutes; add a coagulant with a concentration of 10wt% to the discharged wastewater The aluminum salt is 1200mg / L, and the two are reacted in the reactor 2 together with the waste water for 25 minutes. After the reaction, they enter the solid-liquid separator for solid-liquid separation. The residence time is 10 minutes. The dosage of cationic polyacrylamide is 3mg / L; the stirring speed is adjusted according to the size of the sludge alum flower and the sedimentation rate. The supernatant is discharged from the system, and 1% of the sludge discharged from the bottom is returned to the secondary reaction coagulation tank, and the rest is ...

Embodiment 2

[0045] The ash water from the gasification unit of the aerospace furnace has a temperature of 75°C and a total silicon content of 260mg / L. Add liquid caustic soda to the wastewater in the pipeline to adjust the pH to 10.50, and then transfer the alkali-adjusted water to Reactor 1 for the reaction of adding magnesium agent. The reaction time is 30 minutes; add a coagulant with a concentration of 10wt% to the discharged wastewater The aluminum salt is 1200mg / L, and the two are reacted in the reactor 2 together with the waste water for 25 minutes. After the reaction, they enter the solid-liquid separator for solid-liquid separation. The residence time is 10 minutes. The dosage of cationic polyacrylamide is 3mg / L; the stirring speed is adjusted according to the size of the sludge alum flower and the sedimentation rate. The supernatant is discharged from the system, and 1% of the sludge discharged from the bottom is returned to the secondary reaction coagulation tank, and the rest ...

Embodiment 3

[0047] The ash water from the gasification unit of the aerospace furnace has a temperature of 75°C and a total silicon content of 260mg / L. Add liquid caustic soda to the wastewater in the pipeline to adjust the pH to 9.50, and then transfer the alkali-adjusted water to Reactor 1 for the reaction of adding magnesium agent. The reaction time is 30 minutes; add a coagulant with a concentration of 10wt% to the discharged wastewater The aluminum salt is 1200mg / L, and the two are reacted in the reactor 2 together with the waste water for 25 minutes. After the reaction, they enter the solid-liquid separator for solid-liquid separation. The residence time is 10 minutes. The dosage of cationic polyacrylamide is 3mg / L; the stirring speed is adjusted according to the size of the sludge alum flower and the sedimentation rate. The supernatant is discharged from the system, and 1% of the sludge discharged from the bottom is returned to the secondary reaction coagulation tank, and the rest i...

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Abstract

The invention relates to a silicon removal method for wastewater discharged by an aerospace furnace gasification process, belongs to the technical field of coal liquefaction sewage treatment, and solves the problem that the total silicon of the wastewater discharged by the aerospace furnace gasification process in the prior art does not reach the standard and the long-period operation of a systemcannot be ensured. A method combining magnesium agent silicon removal, aluminum salt coagulation and a solid-liquid separator is adopted, under the conditions that the sludge discharge amount is reduced and a settling tank with a large occupied area is not used, soluble silicon dioxide and part of colloidal silicon in water are effectively removed, and the concentration of silicon dioxide in recycled water is controlled to be 20 mg / L. The method is obvious in effect, simple in technological process, small in occupied area and convenient and reliable to control, the requirement of industrial enterprises for reducing the sewage treatment cost can be met, silicon dioxide influencing long-period operation of the system is effectively removed, and the requirements of environmental protection, production and operation of the enterprises are met.

Description

technical field [0001] The invention belongs to the technical field of coal liquefaction sewage treatment, and in particular relates to a method for removing silicon from waste water discharged from a space furnace gasification process. Background technique [0002] At present, in the field of coal chemical industry, especially the pressurized gasification technology of aerospace furnace, pulverized coal particles 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 generated. When using the "three high" coal in Jincheng, Shanxi, the silicon waste generated during the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/66C02F1/5236C02F1/60
Inventor 陈慧刚王宏斌张莉莉张国华裴育斐司俊宋刘芳王博郭晓晓王文斌
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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