Dewatering method for carbon-powder-containing sludge of acid production wastewater generated after purification of flue gas of sintering machine

A flue gas purification and sludge dehydration technology, applied in water/sludge/sewage treatment, chemical instruments and methods, dehydration/drying/thickened sludge treatment, etc., can solve the problems of processing environment requirements and high cost of processing equipment, Achieve the effects of avoiding complex chemicals, achieving removal, and improving dehydration performance

Inactive Publication Date: 2019-04-16
BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In step (4) of the method, the sludge should be made into a mud cake and the sludge cake should be pyrolyzed at 650-700°C for 2-2.5 hours under an inert atmosphere, so the processing environment required by the method requires and processing equipment cost prohibitive

Method used

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  • Dewatering method for carbon-powder-containing sludge of acid production wastewater generated after purification of flue gas of sintering machine

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Experimental program
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Embodiment 1

[0034]Step 1: adding metal chlorides or metal oxides to the sludge containing carbon powder, adjusting the mass ratio of carbon powder to total metal ions to less than 1.5, preferably 1. The metal chloride or oxide is a metal chloride or oxide capable of forming insoluble precipitates under alkaline conditions. Here, the feature of rich surface functional groups and large specific surface area of ​​activated carbon is utilized, and a certain amount of metal ions are added under acidic conditions at this time to modify the activated carbon so that the activated carbon forms a composite of activated carbon and metal ions; wherein, the carbon The particle size of the powder ranges from 1 to 100 μm, preferably 10 to 50 μm, and the metal chloride or oxide includes but is not limited to one or more of iron, copper, lead, calcium, zinc, cadmium, cobalt, nickel, and aluminum salts various;

[0035] Step 2: Add lye to the solution obtained after step 1 that has adjusted the ratio of c...

Embodiment 2

[0040] Other steps of the present invention remain unchanged, wherein in step 1, add metal chloride or metal oxide in this step to the sludge containing carbon powder, change the metal chloride or metal oxide into acid waste water containing metal ions, At this time, it is carried out according to the principle that other steps remain unchanged. After dehydration, the present invention can realize the synergistic removal of metal ions and carbon powder, which is very environmentally friendly and convenient.

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Abstract

The invention provides a dewatering method for carbon-powder-containing sludge of acid production wastewater generated after purification of flue gas of a sintering machine. The method comprises the five steps of 1, adding metal chloride or metal oxide to the carbon-powder-containing sludge; 2, adding an alkaline solution into a solution with the adjusted carbon powder and metal ion ratio in the first step, conducting full stirring, and controlling the pH of the solution to 8-12; 3, adding anionic PAM into the solution obtained in the second step; 4, after the anionic PAM is added into the solution obtained in the third step, quickly stirring the solution at first, and afterwards slowly stirring the solution to obtain carbon powder sludge; 5, transferring the carbon powder sludge obtainedin the fourth step into sludge dewatering equipment for dewatering. By means of the dewatering method, the modification and deep flocculation of activated carbon powder are achieved, the dewatering performance is improved, selected reagents are relatively common, the proportion is easy to control, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a carbon powder-containing sludge dehydration method for purifying acid-making wastewater with flue gas of a sintering machine. Background technique [0002] After the sintering machine flue gas is desulfurized and denitrified by activated carbon, complex analytical gas (SRG gas) containing high concentration of sulfur dioxide, high dust, and high salt content will be produced during the high-temperature analysis of activated carbon. The gas is discharged from the outlet of the analysis tower and sent to the acid system Prepare sulfuric acid. In order to ensure the quality of sulfuric acid and the stability of the acid system, it is necessary to adopt the wet scrubbing method to wash and remove impurities from the SRG gas while cooling down the temperature of the SRG gas. SRG gas contains a large amount of dust (mainly activated carbon powder), which enters the washing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/148
CPCC02F11/14
Inventor 王天球朱彤龚天龙浦志敏吴万江张文刚
Owner BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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