The preparation method of metal oxide
An oxide and metal technology, applied in the field of metal oxide preparation, can solve the problems of ammonia nitrogen wastewater and greenhouse gas environmental pollution, and achieve the effects of short preparation process, low cost of raw materials, and low-carbon environmental protection product performance.
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[0028]In view of the environmental pollution caused by ammonia nitrogen wastewater and greenhouse gas emissions in the metal oxide preparation process in the prior art, in a typical embodiment of the present invention, a metal oxide preparation method is provided, such asfigure 1 As shown, the preparation method includes: step S1, using ammonia gas and carbon dioxide gas to perform a precipitation reaction on a metal salt solution, and controlling the mass ratio of the three so that the pH value of the mixed system is in the range of 2.0 to 10.0 to obtain a slurry; step S2 , The slurry is subjected to solid-liquid separation to obtain a waste liquid containing ammonium ions and metal carbonates and / or metal alkali carbonates; and step S3, the metal carbonates and / or metal alkali carbonates are Roasting to obtain metal oxides and waste gas containing carbon dioxide gas; among them, ammonia gas is obtained by stripping and enriching the wastewater containing ammonium ions through alka...
Embodiment 1
[0070]A cerium chloride solution (absolute purity of 99.5%) with a concentration of 1.2 mol / L was prepared and added to the precipitation reactor. Ammonia gas was introduced into the precipitation reactor until the pH of the system reached 6 to 7, and then the ammonia gas and carbon dioxide gas The mass ratio is 1:1.3, and ammonia gas and industrial-grade carbon dioxide gas (concentration of 99.8%) are introduced into the precipitation reactor for carbonization reaction; during the carbonization reaction, the reaction system is open at atmospheric pressure and does not require external heating, but due to participation The reacted ammonia gas has a certain amount of heat, so the temperature of the reaction system is about 45°C. After the carbonization reaction lasts for 2.5 hours, a cerium carbonate slurry is obtained, which is filtered, washed, and dried to obtain cerium carbonate. At the same time, the filtered waste liquid is recovered after filtration. It is ammonium chloride wa...
Embodiment 2
[0073]A cerium chloride solution with a concentration of 0.5 mol / L is added to the precipitation reactor, and ammonia gas is introduced into the precipitation reactor until the pH of the system reaches 6 to 7, and then the mass ratio of ammonia gas and carbon dioxide gas is 1.2:1. Ammonia gas and industrial-grade carbon dioxide gas (carbon dioxide concentration of 99.8%) are introduced into the precipitation reactor for carbonization reaction; the reaction system is open to atmospheric pressure during the carbonization reaction process and does not require external heating, but because the ammonia gas involved in the reaction has A certain amount of heat, so the temperature of the reaction system is about 65℃, the carbonization reaction lasts for 3 hours to obtain basic cerium carbonate slurry, which is filtered, washed and spin-dried to obtain basic cerium carbonate. At the same time, the filtered waste liquid is recovered after filtration, which is chlorine Ammonium chloride waste...
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