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A method for reducing suspended particles in wet-process white carbon black production wastewater

A technology for wet-process silica and production wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of high treatment cost, uneconomical, and poor sedimentation effect and other problems, to achieve the effect of low suspended solids content and good waste water sedimentation

Active Publication Date: 2022-02-15
QUECHEN SILICON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the particles of silica are very small, flocculants such as polyaluminum chloride and polyacrylamide are not effective in sedimentation of silica wastewater, and the dehydration of sedimentation sludge is poor, and the filtrate in the press filtration process still contains a large amount of suspended solids
The processing cost of sand filtration, microfiltration and other methods is too high and uneconomical

Method used

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  • A method for reducing suspended particles in wet-process white carbon black production wastewater

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preparation example Construction

[0023] The preparation method of the modified wood powder in the embodiment is as follows: fully stir and mix 100 g of wood powder and 100 g of absolute ethanol, the wood powder is 300 mesh, after heating to 190-200 ° C, slowly add 200 g of sodium hydroxide with a concentration of 20 wt % Solution (40g sodium hydroxide dissolved in 160mL water), after mixing, alkalinize for 1h. After the alkalization reaction, add 100 g of chloroacetic acid solution with a concentration of 10 wt % (10 g of chloroacetic acid dissolved in 90 mL of water), and react at 95-100° C. for 2 hours to obtain a carboxylated product. Add 1g of potassium persulfate and 20g of polyacrylamide to the carboxylation product, mix well and react at 50-52°C for 1.5h. After the reaction is completed, the obtained material is diluted with 100 times the volume of water to obtain the obtained product.

[0024] White carbon black production wastewater comes from mother hydraulic filtration in the production process of...

Embodiment 1

[0027] A method for reducing suspended particles in wet-process white carbon black production wastewater, adjusting the pH value of white carbon black production wastewater to 8.2, taking the volume of white carbon black production wastewater as a benchmark, adding 1% of the above-mentioned modified wood powder flocculation of wastewater volume agent, slowly stirring and flocculating for 8min. Then add 300-mesh zeolite powder to the wastewater, the amount of zeolite powder added is 0.07g per 1L of wastewater, and slowly stir and flocculate for 3min. After flocculation, the waste water was settled for 4 hours, the supernatant was discharged, and the settled sludge was subjected to plate and frame filter press.

Embodiment 2

[0029] A method for reducing suspended particles in wet-process white carbon black production wastewater, adjusting the pH value of the white carbon black production wastewater to 8.0, taking the volume of the white carbon black production wastewater as a benchmark, adding the above-mentioned modified wood powder flocculation of 1.2% of the waste water volume agent, slowly stirring and flocculating for 8min. Then add 300-mesh zeolite powder into the waste water, the amount of zeolite powder added is 0.08g per 1L of waste water, and slowly stir and flocculate for 4min. After flocculation, the waste water is settled for 3 hours, the supernatant is discharged, and the settled sludge is subjected to plate and frame filter press.

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Abstract

The invention discloses a method for reducing suspended particles in waste water produced by wet process white carbon black, adjusting the pH value of waste water produced by white carbon black, adding modified wood flour flocculant for the first flocculation, and then adding zeolite powder for the second flocculation Flocculation, sedimentation after the second flocculation, and dehydration of the sedimented sludge by plate and frame filter press. In the method, modified wood powder and zeolite powder are used as flocculants to successively flocculate white carbon black production wastewater, the wastewater after flocculation has good settleability, sludge is easy to dehydrate, and supernatant has low suspended matter content.

Description

technical field [0001] The invention belongs to the field of industrial waste water, and in particular relates to a method for reducing suspended particles in wet-process white carbon black production waste water. Background technique [0002] White carbon black is the general term for white powder X-ray amorphous silicic acid and silicate products, mainly refers to precipitated silica, fumed silica and ultrafine silica gel, and also includes powdered synthetic silicic acid Aluminum and calcium silicate, etc., its composition can be SiO 2 ·nH 2 O represents, where nH 2 O exists in the form of surface hydroxyl groups. [0003] Precipitated silica refers to sulfuric acid, hydrochloric acid, CO 2 Silica produced with water glass as the basic raw material exists in the form of amorphous microporous powder. Its main production process is: industrial water glass is produced by reacting quartz sand with soda ash under high temperature conditions, and the water glass is diluted ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCC02F9/00
Inventor 王永庆
Owner QUECHEN SILICON CHEM