Process for treating and recycling rare-earth wastewater containing magnesium sulfate, ammonium sulfate and sulfuric acid
A wastewater treatment and ammonium sulfate technology, which is applied in metallurgical wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems that affect the enthusiasm of enterprises to recycle, have not found public patent documents, and are unfavorable for rare earth smelting. Factory processing and other issues to achieve the effect of improving efficiency and working range, reducing energy consumption, and reducing costs
Inactive Publication Date: 2012-08-29
INNER MONGOLIA TIANYI ENVIRONMENTAL TECH
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Problems solved by technology
[0002] Evaporation and crystallization has always been a conventional process for the treatment and recovery of rare earth wastewater containing magnesium sulfate, ammonium sulfate and sulfuric acid. Through multi-pole and multi-effect evaporation to extract water, the crystallized salt will be recycled and reused; when the wastewater composition is complex and the concentration is too high, treatment When the amount is large, the cost and energy consumption of this process will also increase, and it is also not conducive to the local treatment of rare earth smelters. The remaining magnesium sulfate and ammonium sulfate crystals are not raw materials for rare earth smelters, and their recycling profits are very important for rare earth smelters. Very low, which affects the enthusiasm of enterprises to recycle
[0003] Through searching, no published patent documents identical to this patent application have been found
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[0016] The present invention will be further described in detail with reference to specific embodiments below through the accompanying drawings. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.
[0017] A process for the treatment and recycling of rare earth wastewater containing magnesium sulfate, ammonium sulfate and sulfuric acid, the specific process steps are:
[0018] (1) The suspension treated by natural sedimentation is input into the DEP microfiltration, and the working pressure is 1 to 2 bar to separate the solid particles contained in the suspension, and the concentrated solution is recycled to the sedimentation again, and the treated The liquid without solid suspension is input into the DEP nanofiltration group;
[0019] (2) In the DEP nanofiltration unit, the magnesium sulfate, ammonium sulfate and sulfuric acid in the liquid without solid suspended matter will be concentrated, thereby...
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Abstract
The invention relates to a process for treating and recycling rare-earth wastewater containing magnesium sulfate, ammonium sulfate and sulfuric acid, which comprises the following steps that (1) suspension subjected to natural settling treatment is input into a DEP (diethyl phthalate) microfiltration unit so as to separate out solid particles contained in the suspension under the working pressuredrop of 1 to 2bar, concentrated solution is circulated into a sedimentation tank, and treated solution without solid suspensoid is input into a DEP nanofiltration unit; (2) in the DEP nanofiltration unit, magnesium sulfate, ammonium sulfate and sulfuric acid in the solution without the solid suspensoid are concentrated so as to remove salt in the wastewater, liquid generated after the salt is removed is used for industrial water, and the concentrated salt solution is input into an osmotic pressure power station for generating electricity, wherein the pressure drop required by the nanofiltration work is in the range of 5 to 6bar; and (3) domestic sewage subjected to microfiltration treatment and concentrated sulfuric acid solution are input into the osmotic pressure power station for generating electricity and wastewater output by the power station is respectively input into the DEP nanofiltration unit and the DEP microfiltration unit again to be treated and then is continuously used for generating the electricity.
Description
technical field [0001] The invention belongs to the technical field of environmental protection, and relates to waste water treatment of rare earth smelters based on magnesium sulfate, ammonium sulfate and sulfuric acid and the recovery of effective substances for recycling, and the energy generated by the treatment and recovery is used for energy supplementation of the treatment process, especially a sulfuric acid-containing Rare earth wastewater treatment and recycling process for magnesium, ammonium sulfate and sulfuric acid. Background technique [0002] Evaporation and crystallization has always been a conventional process for the treatment and recovery of rare earth wastewater containing magnesium sulfate, ammonium sulfate and sulfuric acid. Through multi-pole and multi-effect evaporation to extract water, the crystallized salt will be recycled and reused; when the wastewater composition is complex and the concentration is too high, treatment When the amount is large, ...
Claims
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IPC IPC(8): C02F9/06C02F1/52C02F1/469C02F103/16
Inventor 杜飞王冰
Owner INNER MONGOLIA TIANYI ENVIRONMENTAL TECH