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Method for recycling desilication wastewater by produced capacitance carbon

A technology of wastewater recovery and capacitive carbon, applied in chemical instruments and methods, silicon oxide, silicon dioxide, etc., can solve the problems of desiliconization wastewater pollution and other problems, and achieve the effect of making full use of energy, making full use of resources, and reducing energy loss.

Active Publication Date: 2019-07-26
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for the recycling of capacitor carbon desiliconization waste water, using pyrolytic carbon to absorb desiliconization waste water and adding acid to co-precipitate with silicon dioxide to prepare uniformly dispersed and non-agglomerated C / SiO2 composite material precursor , the C / SiO2 composite material was prepared by pulverization, modification and modification, which not only solved the problem of desiliconization wastewater polluting the environment, but also produced high value-added biomass chemical products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1. Rice husk pyrolysis

[0033] Select rice husks, screen and purify them and put them into the pyrolysis tower through a bucket elevator, raise the temperature to 650°C, and pyrolyze for 1.0h, and the rice husks will be decomposed into pyrolysis gas and pyrolysis charcoal;

[0034] Step 2. Constant temperature carbonization and tar catalytic cracking

[0035] The 650°C pyrolysis gas and pyrolysis charcoal obtained in the first step continue down the pyrolysis tower, and maintain a constant temperature to remove tar for 1.0 hours to obtain tar-free pyrolysis gas and pyrolysis charcoal, and the pyrolysis gas is drawn out from the side , enter the heat exchanger to prepare hot air, cool the pyrolysis gas to 300°C-350°C, and separate the pyrolysis gas and pyrolysis carbon fine powder through the cyclone separator; the pyrolysis carbon continues to enter the water-cooled cooling section of the pyrolysis tower, Cool down to 300℃~350℃, and send it to the storage bin thr...

Embodiment 2

[0041] Step 1. According to the mass ratio of pyrolytic charcoal to sodium silicate in the desiliconization wastewater is 2:1, add part of the pyrolytic charcoal in Step 2 of Example 1 to the desiliconization wastewater in Step 4, stir and mix evenly, add The concentration is 15wt% sulfuric acid to neutralize to a pH value of 7, continue to stir for 30min, filter, and separate the solid phase and the liquid phase;

[0042] Step 2. According to the molar ratio of sodium silicate: calcium hydroxide = 1:1, add calcium hydroxide solution to the liquid phase obtained in step 1, stir for 30 minutes, age for 12 hours, filter and separate CaSO3 precipitate and NaOH solution , the liquid phase is returned to the alkali matching process to prepare the alkali solution;

[0043] Step 3, washing the solid phase prepared in step 1 twice with deionized water, centrifugal dehydration, and drying the filter cake to prepare a C / SiO2 composite material precursor.

Embodiment 3

[0045] Add the dry C / SiO2 composite material precursor obtained in step 3 of Example 2 into a ball mill, and pulverize it to a particle size range of 0.1 μm to 10 μm. According to the modifier and C / SiO2 2 The mass ratio of the powder is 3:100, add modifier, and continue ball milling for 60 minutes to prepare active C / SiO 2 composite material.

[0046] The modifier is a compound of one or more of silane coupling agent, titanate coupling agent, carboxylated polyethylene glycol, methacrylic acid, asphalt, and phenolic resin.

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Abstract

The invention discloses a method for recycling desilication wastewater by produced capacitance carbon, and belongs to the field of biomass energy chemical industry. The method includes the steps: (1)performing thermolysis on a biomass to generate thermolysis gas and thermolysis carbon; (2) dissolving out silicon dioxide by the thermolysis carbon, adsorbing pale yellow wastewater containing sodiumsilicate by the thermolysis carbon, adding acid to precipitate to prepare a C / SiO2 composite material precursor, and crushing and modifying the precursor to prepare a C / SiO2 composite material. The desilication wastewater is adsorbed by the thermolysis carbon, the acid is added, the acid and the silicon dioxide are co-precipitated to prepare uniformly dispersed non-agglomerated C / SiO2 composite material precursor, and the precursor is crushed and modified to prepare the C / SiO2 composite material. The method solves the problem that the environments are polluted by the desilication wastewater,and biomass chemical products with high additional values are prepared.

Description

technical field [0001] The invention belongs to the field of biomass energy chemical industry, and specifically discloses a method for recycling and utilizing waste water from desiliconization produced by capacitor carbon. Background technique [0002] In my country, capacitive carbon prepared from rice husks has been recognized by the industry as an electrode material for supercapacitors. Scientists and entrepreneurs cooperate to use domestic capacitive carbon to fill the gap in domestic production. Pyrolytic charcoal is prepared by pyrolysis of rice husks. Pyrolytic charcoal is mainly composed of silica and charcoal. Before charcoal is activated, silica and charcoal are generally separated by alkali-dissolving silica. Due to the existence of a small amount of tar in the pyrolytic carbon, the solution is light yellow, and after concentration, a brown solution is formed, which becomes waste and pollutes the environment. The use of desiliconization wastewater to produce whit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/05C01B33/18
CPCC01B32/324C01B32/05C01B33/18C01P2004/80Y02E60/13
Inventor 王晓峰杨晓敏朱燕超田玉美王子忱
Owner JILIN UNIV
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