Method for producing three-dimensional network solidification and sealing carbonaceous ceramsite by hot dipping of leather sludge

Abstract

The invention provides a method for producing three-dimensional network solidification and sealing carbonaceous ceramsite by hot dipping of leather sludge. Then put it into a cracking furnace, and thermally crack it in isolation from air at 300-800°C until no cracking gas is produced, forming carbonaceous ceramsite with a large number of micropores on the surface; then impregnated in the impregnated material, using carbon The temperature of the ceramsite itself melts the impregnated material, infiltrates the carbonaceous ceramsite and enters the micropores of the carbonaceous ceramsite for heavy metal fixation and three-dimensional network sealing, and natural cooling, that is, the finished three-dimensional network is solidified and sealed carbonaceous ceramsite; The impregnating material is polymer resin. The cured metal ions of the present invention are basically unable to dissolve and have high safety. At the same time, the carbonaceous ceramsite has certain hydrophobicity, strong weather resistance and toughness, and has high application value in light building materials, water resistance, heat insulation materials and the like.

Description

【Technical field】 [0001] The invention relates to a method for producing solidified and sealed carbonaceous ceramsite by thermal dipping of leather sludge. 【Background technique】 [0002] The leather industry is the pillar industry of my country's light industry and an important export-oriented industry. From the perspective of the global leather industry, the total annual demand for leather is about 200 million m 2 , which is equivalent to the output of about 300 million pieces of cowhide (standard leather), and China’s leather output is equivalent to nearly 70 million pieces of standard leather, accounting for about 23.33% of global leather production. Quanzhou is one of the main centers of the leather industry in Fujian Province, with an annual output value of more than 10 billion yuan, and the environmental pollution problem has been relatively serious in history. After years of rectification and relocation, most of the large-scale enterprises that remain in the local ...

AI Technical Summary

Problems solved by technology

[0005] Existing problems are: 1. This type of sludge itself is highly viscous, and the phenomenon of hardening during the drying process is serious. When stacking, it hinders air oxygen from entering the soil and stockpile. Therefore, the existing composting and landfill processes are mainly based on anaerobic fermentation and degradation. A large amount of methane and odorous gases generated during the process will migrate to the air and cause serious environmental pollution. The scheduling technology required to solve this anaerobic problem should include low-temperature drying / tail gas treatment and sludge porous technology research and development. It is estimated that the investment in equipment is large and the cost-effectiveness ratio Not good; 2. Leather sludge is high-salinity sludge and is not easy to wash off, which is unfavorable to the survival and absorption of conventional bacillus, actinomycetes and other fermentation bacteria and plants after composting; 3. The pollutant chromium in the sludge is not easy to be Soil minerals and ions are fixed, leaching and removal are difficult to industrialize due to the high water retention of compost

2. Pollutants are fixed and discharged into the ground

[0007] Existing problems are: 1. When incinerated below 800 degrees Celsius, it is difficult to solve the problem that a large number of dioxins are generated due to the presence of O, Cl and other elements at the same time, and the incineration ash is not easy to form highly stable glass-phase closed slag (expensive boron Except for salt glass phase, and the problem of phase separation and dissolution of borate glass phase is still difficult to solve), heavy metal chlorides volatilize seriously when it is higher than 800 degrees Celsius, but it is easy to form an effective glass phase seal; leather pyrolysis gas during incineration has a foul smell and high sulfur content If the traditional incineration method of removing pyrolysis gas requires a large amount of air supplementation, the energy consumption and tail gas treatment difficulty will be increased accordingly. Catalytic supplementary combustion will require complex pre-treatment equipment due to the presence of a large amount of incineration fly ash, which is unacceptable for current incineration plants; 2 .The problem of the fixed reliability of the pollutants mainly includes the weather resistance of the stationary phase, the amount of dissolution, the mechanical strength, etc. Since the leather sludge contains a large amount of soluble salts, it needs to add a large amount of glass phase products to effectively wrap it. It means that traditional methods such as firing building bricks (coarse pottery) and sintering traditional ceramsite are also very dangerous, and the cost is expected to be high

[0009] Existing problems: The leather sludge after conventional thermal cracking treatment at 300-800 degrees Celsius is a kind of black porous hydrophilic carbon particles with a large amount of inorganic salts embedded inside, the mechanical strength is not high and easy to break, and moisture enters the gaps in the acid-base environment It leads to easy precipitation of salt and heavy metals, and various performances cannot fully meet the main detection methods such as GB5086.2-1997; the national standard of ceramsite "Light Aggregate and its Test Method" GB / T17431.1-1998

It is necessary to solve the problem of excessive porosity

2. The problem of mechanical strength

3. The dissolution of heavy metals

4. Cost issues

This type of embedded body is a core-shell embedded structure. Once the shell is broken, the pollutants are easily dissolved from the core under the action of water, which is poor in safety and difficult to recycle; some pollutants are mixed with cement, magnesium oxychloride, Mixed curing of glass, gypsum, asphalt, etc. requires a large amount of curing and high cost