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Method for deodorizing steam condensate of still kettle in production process of calcium silicate board

A technology for steam condensate and production process, which is applied in chemical instruments and methods, neutralization water/sewage treatment, filtration treatment, etc. The effect of easy promotion, simple process flow and mild operating conditions

Active Publication Date: 2020-06-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are no literature reports on the deodorization of steam condensate water in autoclaves during the production of calcium silicate boards

Method used

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  • Method for deodorizing steam condensate of still kettle in production process of calcium silicate board
  • Method for deodorizing steam condensate of still kettle in production process of calcium silicate board
  • Method for deodorizing steam condensate of still kettle in production process of calcium silicate board

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Experimental program
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Embodiment 1

[0031] The method for deodorizing the steam condensate in the autoclave during the production of the calcium silicate board provided in this embodiment includes:

[0032] S1: Add activated clay in an amount of 20g / L to the steam condensate water to be treated, stir for 75min, and press filter with a screw stacker to obtain filtered water.

[0033] S2: Add sulfuric acid solution with a mass fraction of 65% to the filtered water obtained in step S1, adjust the pH value to 1.85, then add potassium permanganate in an amount of 40 mg / L, stir evenly, and let stand for 24 hours.

[0034] S3: Under continuous stirring, add 50 mg / L activated carbon to the water obtained in step S2, stir for 120 min, then slowly add barium carbonate, adjust the pH value to 7.75, and then pass through a bag filter (filter precision 1 μm) and a filter element filter (Filtration accuracy 0.45μm) secondary filtration system, the effluent is the water body after treatment, such as figure 2 Shown in B.

Embodiment 2

[0036] The method for deodorizing the steam condensate in the autoclave during the production of the calcium silicate board provided in this embodiment includes:

[0037] S1: Add activated clay in an amount of 13.3g / L to the steam condensate water to be treated, stir for 90min, and press filter with a screw stacker to obtain filtered water.

[0038] S2: Add sulfuric acid solution with a mass fraction of 65% to the filtered water obtained in step S1, adjust the pH value to 2.07, then add potassium permanganate in an amount of 21 mg / L, stir evenly, and let stand for 20 hours.

[0039] S3: under constant stirring, add consumption 30mg / L gac to the water that step S2 obtains, stir 90min, then add barium carbonate, adjust pH value to 7.23, pass through bag filter (filter precision 1 μ m) and filter core filter ( The secondary filtration system with a filtration accuracy of 0.45μm), the effluent is the water after treatment.

Embodiment 3

[0041] The method for deodorizing the steam condensate in the autoclave during the production of the calcium silicate board provided in this embodiment includes:

[0042] S1: Add activated clay in an amount of 5.2g / L to the steam condensed water to be treated, stir for 90min, and press filter with a screw stacker to obtain filtered water.

[0043] S2: Add sulfuric acid solution with a mass fraction of 65% to the filtered water obtained in step S1, adjust the pH value to 2.59, then add potassium permanganate in an amount of 30 mg / L, stir evenly, and let stand for 20 hours.

[0044] S3: Under constant stirring, add 42 mg / L activated carbon to the water obtained in step S2, stir for 90 minutes, then add calcium hydroxide, adjust the pH value to 7.09, and then pass through a bag filter (filter precision 3 μm) and a filter element filter (Filtration accuracy 0.45μm) secondary filtration system, the effluent is the water body after treatment.

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Abstract

The invention belongs to the technical field of wastewater deodorization, and particularly discloses a method for deodorizing steam condensate of a still kettle in a production process of a calcium silicate board. The method specifically comprises the following steps: adding activated clay into to-be-treated steam condensate, uniformly mixing, and filtering to obtain filtered water; adding a sulfuric acid solution into the obtained filtered water, adjusting the pH value to 1-3, adding potassium permanganate, uniformly stirring, and standing to obtain a mixed solution; adding activated carbon into the obtained mixed solution under continuous stirring, uniformly mixing, adding a neutralizer, regulating the pH value to 6-8, filtering, and discharging water, thereby obtaining the treated waterbody. According to the method, the odor threshold removal rate of the steam condensate of the still kettle in the production process of the calcium silicate board can reach 85% or above, the odor threshold deodorization rate reaches 95.6%, the COD removal rate reaches 97.6%, the chromaticity is reduced to 0.1 degree, and the turbidity is reduced to 0 NTU.

Description

technical field [0001] The invention belongs to the technical field of waste water deodorization, and in particular relates to a method for deodorizing steam condensed water in an autoclave during the production process of a calcium silicate board. Background technique [0002] In the production process of calcium silicate board, it is necessary to use an autoclave for autoclave curing, and the CaO-SiO 2 -H 2 The hydrothermal reaction of O, but the process will produce a lot of pungent and unpleasant steam. In the past, calcium silicate board manufacturers collected the steam, passed it through a heat exchanger, and then passed UV photolysis and spray demisting, and then discharged the gas at high altitude. After the spray water and condensed water were collected, they were directly discharged to the outside world, which caused A lot of water resources are wasted and the environment is polluted. [0003] With the increasingly stringent environmental protection policies, m...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/12
CPCC02F1/001C02F1/281C02F1/283C02F1/66C02F1/72C02F9/00C02F2103/12C02F2301/08C02F2303/02
Inventor 缪飞杨仁党张旻昊
Owner SOUTH CHINA UNIV OF TECH
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