Method for recovering water and sulfate substances from rare earth sulfate production wastewater

A sulfate and production waste water technology, which is applied in the field of recycling water and sulfate substances, can solve the problems of inability to achieve clean production goals, poor treatment effects, and low treatment efficiency, and achieve treatment costs without secondary pollution and treatment costs The effect of low, high processing efficiency

Active Publication Date: 2015-08-12
南京绿联环境科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods have problems such as low treatment efficiency, poor treatment effect, large investment, high operating cost, secondary pollution, etc., and cannot achieve the goal of clean production

Method used

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  • Method for recovering water and sulfate substances from rare earth sulfate production wastewater
  • Method for recovering water and sulfate substances from rare earth sulfate production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1; To the sulfuric acid wastewater pilot test (August 2013) of a rare earth enterprise in Baotou, Inner Mongolia, the steps are as follows:

[0049] (1) Component detection: The wastewater is sulfuric acid wastewater produced by the sodium bicarbonate precipitation process. After testing: the amount of wastewater is 0.8 tons, and there are obviously suspended and precipitated calcium and magnesium salts in the wastewater; pH: 6.17; conductivity: 25200us / cm; soluble solids: 3.5%; total hardness: 2129.57 mg / L (CaCO 3 ).

[0050] (2) Pretreatment: According to the water quality index of the wastewater, stir and add sodium hydroxide solution, adjust the pH to 9.5, settle for 2 hours, and filter the supernatant with a 5 μm bag filter to remove large suspended particles in it The next processing procedure. After the sediment is collected, it is separated by a centrifuge, weighed, dried and stored.

[0051] Softening treatment: Add polyepoxysuccinic acid (PESA) ...

Embodiment 2

[0054] Example 2: Commissioning of a sulfuric acid wastewater treatment project carried out by a rare earth enterprise under Inner Mongolia Baotou Iron and Steel Company (February 2014), including the following steps:

[0055] (1) Component detection: The wastewater is sulfuric acid wastewater produced by the sodium bicarbonate precipitation process. The amount of wastewater treated on that day is 30 tons, and there are suspensions and sediments visible to the naked eye in the wastewater. Its pH: 6.50; conductivity: 42000us / cm; soluble solids 5%.

[0056] (2) Pretreatment: According to the water quality index of the wastewater, add sodium hydroxide and sodium carbonate solution respectively under stirring, and adjust the pH to 10.3; advective precipitation, the supernatant adopts a 25 μm bag filter and a 0.1um microfiltration membrane Combined filtration, the filtrate is transferred to the next treatment process; the sediment is filtered out with a plate and frame filter press...

Embodiment 3

[0060]Embodiment three: the pilot test (in March 2014) of the ammonium bicarbonate process wastewater of a rare earth enterprise in Baotou, Inner Mongolia, including the following steps:

[0061] (1) Component detection: The wastewater is the wastewater produced by the ammonium bicarbonate precipitation process. After testing, the amount of wastewater is 0.95t. There are obviously suspended and precipitated calcium and magnesium salts in the wastewater, and it emits a heavy ammonia smell. Its pH: 8.9; conductivity: 32000us / cm; soluble solids: 4.5%.

[0062] (2) Pretreatment: According to the water quality index of the wastewater, stir and add sodium hydroxide solution, adjust the pH to 9.7, and settle for one hour. The supernatant is filtered with a 1 μm filter element and then transferred to the next treatment process. After the sediment is collected, it is separated by a centrifuge and dried for storage.

[0063] Softening treatment: add aspartic acid or maleic anhydride to...

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Abstract

The invention relates to a method for recycling water and sulfate substances from rare earth sulfate production wastewater, and belongs to the technical field of comprehensive treatment on pollutants generated in rare earth wet method smelting and chemical production. The method for treating rare earth sulfate production wastewater with high salt content comprises the following steps: respectively collecting two different properties of wastewater of ammonium bicarbonate precipitate or sodium bicarbonate precipitate, detecting the components of the wastewater, performing pretreatment, softening treatment, reverse osmosis separation concentration, evaporation concentration or precipitation and ammonium sulfate recycling, and the like. A conventional sewage treatment method is tightly combined with a modern separation technique, the wastewater can be effectively treated, the environment is protected, valuable substances in the wastewater can be recycled, and recycling of the water resource and the sulfate substances is achieved. Moreover, the equipment can be stably operated, at the same time the energy consumption in the treatment process is reduced, and the cost of rare earth production companies is lowered.

Description

technical field [0001] The invention relates to a method for comprehensive treatment of pollutants produced by rare earth wet smelting and chemical production, in particular to a method for recovering water and sulfate substances from wastewater produced by rare earth sulfate. Background technique [0002] Rare earth carbonate is one of the main products in the rare earth industry. The current production process is: first use concentrated sulfuric acid to roast, mix the rare earth concentrate and sulfuric acid and roast in a rotary kiln; the primary product after roasting, add water to leach soluble rare earth sulfate, and become a leaching solution containing rare earth sulfuric acid; then pour it into the leaching solution Ammonium bicarbonate or sodium bicarbonate is added to convert the rare earth into carbonate semi-finished products, and the crude rare earth carbonate product is obtained by combining precipitation and press filtration; during this period, it is also re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01C1/24C01D5/00
Inventor 戴永琪李蕾戴臻宁
Owner 南京绿联环境科技发展有限公司
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