Investigation of organic impurity and its occurrence in industrial waste salt produced by physicochemical process

Industrial waste salt is classified as hazardous waste to the environment. The organic impurity and its occurrence in industrial waste salt affect the salt resource utilization. In this paper, composition quantitative analysis, XRD, TG-DSC, SEM/FIB-SEM coupled with EDS, FTIR, XPS and GC-Ms were chosen to investigate the organic impurity and its occurrence in industrial waste salt. The organic impurities owe small proportion (1.77%) in the specimen and exhibit weak thermal stability within the temperature of 600°C. A clear definition of organic impurity, including 11 kinds of organic compounds, including aldehyde, benzene and its derivatives etc., were detected in the industrial waste salt. These organic impurities, owing (C-O/C-O-C, C-OH/C = O, C–C/CHx/C = C etc.)-containing function group substance, are mainly distributed both on the surface and inside of the salt particles. Meanwhile, the organic substance may combine with metal cations (Ni2+, Mg2+, Cu2+ etc.) through functional groups, such as hydroxide, carbonyl etc., which increases its stability in the industrial waste salt. These findings provide comprehensive information for the resource utilization of industrial waste salt from chemical industry etc.

Quantum Dots Ceramic Nano Membrane for Copper Mining Water Treatment, Turning Na2SO4 to NaOH and Pretreatment for Seawater Desalination

<p><a></a><a>This paper </a>reports on performance of ceramic nanofiltration membrane to treat copper mining water, waste salt recycling and purification of seawater. The ceramic filters have α-Al₂O₃ flat-sheet supporter, with sintered TiO₂, Fe₂O₃, or ZrO₂nanoparticles as membrane on the surface of supporter. The membrane has photoluminescence phenomenon when irradiating with UV lamp. It indicates that they are quantum dots material, whose sizes may be between 2-10nm. The Nanofilter can remove more 90% contaminants from copper mining water. It shows good functional stability in the corrosive mining water. It is also able to turn Na₂SO₄ to NaOH by adding Ca(OH)₂. This provides a novel technology to reuse waste salt. The ceramic nanofilter can remove all suspended solid from seawater to ease the subsequent desalination of seawater with reserve osmosis membrane. </p>

Quantum Dots Ceramic Nano Membrane for Copper Mining Water Treatment, Turning Na2SO4 to NaOH and Pretreatment for Seawater Desalination

<p><a></a><a>This paper </a>reports on performance of ceramic nanofiltration membrane to treat copper mining water, waste salt recycling and purification of seawater. The ceramic filters have α-Al₂O₃ flat-sheet supporter, with sintered TiO₂, Fe₂O₃, or ZrO₂nanoparticles as membrane on the surface of supporter. The membrane has photoluminescence phenomenon when irradiating with UV lamp. It indicates that they are quantum dots material, whose sizes may be between 2-10nm. The Nanofilter can remove more 90% contaminants from copper mining water. It shows good functional stability in the corrosive mining water. It is also able to turn Na₂SO₄ to NaOH by adding Ca(OH)₂. This provides a novel technology to reuse waste salt. The ceramic nanofilter can remove all suspended solid from seawater to ease the subsequent desalination of seawater with reserve osmosis membrane. </p>