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Method for recycling carbon-ammonia in production process of rare earth oxide
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A production process and a technology for oxidizing rare earths, applied in the field of comprehensive utilization of resources
Pending Publication Date: 2021-05-28
GANZHOU NONFERROUS METALLURGICAL RES INST
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The method provided by the invention can recycle ammonia and carbon in the preparation process of rare earth oxides, solve the problems of ammonia nitrogen wastewater and greenhousegas emissions, reduce the cost of ammonium bicarbonate raw materials, and at the same time greatly reduce the ammonia nitrogen content in ammonia nitrogen wastewater , to make it meet emission standards
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Embodiment 1
[0049] The preparation steps of rare earth oxide are:
[0050] (1) Saponification: Saponify the 50vol% P507+50vol% kerosene organic phase with ammonia water to obtain a saponified organic phase;
[0052] (3) Stripping: back-extracting the organic phase loaded with cerium with hydrochloric acid to produce a cerium chloride solution.
[0053] (4) Precipitation: adjust the lanthanum chloride concentration of the solution in step (2) at 90g / L, heat up to 65°C, control the concentration of the ammonium bicarbonate solution at 1.5mol / L, add it to the lanthanum chloride solution after preheating , until the pH of the mixed solution is 6.8, let it stand for 2 hours, filter a...
Embodiment 2
[0059] Rare earth raw material is praseodymiumneodymium chloride, and the preparation step of rare earth oxide is similar to embodiment 1, and the condition of change is as follows: gained stripping solution is praseodymiumneodymium chloride solution, during precipitation, praseodymiumneodymium chloride concentration is 70g / L, precipitation temperature is 50°C, and the concentration of ammonium bicarbonate solution is 2mol / L. NdPrO is obtained after drying and calcination of NdPrCO.
[0060] Combine the ammonium chloride wastewater generated during the extraction and precipitation process, adjust the pH value of the ammonium chloride wastewater to 12 using a sodiumhydroxide solution with a mass fraction of 32%, preheat it to 70°C, and then enter the ammonia distillationtower to strip and distill ammonia The temperature is 85°C, and the pressure inside the control tower is 0.03MPa. Ammonia vapor is condensed into ammonia water in the tower and discharged from the top of t...
Embodiment 3
[0064] Rare earth raw material is samarium chloride, and the preparation step of rare earth oxide is similar to embodiment 1, and the conditions of change are as follows: stripping liquid is samarium chloride solution, during precipitation, samarium chloride concentration is 100g / L, and precipitation temperature is 25 ℃, The concentration of ammonium bicarbonate solution is 1.2mol / L. Samariumcarbonate is dried and calcined to obtain samarium oxide.
[0065] Combine the ammonium chloride wastewater generated during the extraction and precipitation process, adjust the pH value of the ammonium chloride wastewater to 11 using a sodiumhydroxide solution with a mass fraction of 32%, preheat it to 70°C, and then enter the ammonia distillation tower to strip and distill ammonia The temperature is 100°C, and the pressure inside the control tower is 0.06MPa. Ammonia vapor is condensed into ammonia water in the tower and discharged from the top of the ammonia distillation tower.
[0...
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technical field [0001] The invention relates to the technical field of comprehensive utilization of resources, in particular to a method for recycling carbon-ammonia in the production process of rare earth oxides. Background technique [0002] Due to their excellent optical, electrical, magnetic and other physical properties, rare earths have played an important role in improving product performance and product structure, and are widely used in defense industry, petrochemical industry, microelectronics industry, new energy, new functional materials and agriculture, etc. multiple fields. [0003] At present, the production process of rare earth oxides in industry is mainly as follows: rare earth raw materialmother liquor is extracted and separated-re-extraction to obtain rare earth sulfate or rare earth chloride solution, and then a precipitant is added to prepare rare earth precipitates, and rare earth oxide products are obtained after washing and burning . The rare earth...
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