An ion-type rare earth mine wastewater membrane separation technology treatment method and device

A technology for ionic rare earth and mine wastewater, which is applied in mining wastewater treatment, multi-stage water treatment, water/sewage treatment, etc. It can solve the problems of ammonium sulfate cannot be recycled, waste of resources, and difficulty in rare earth wastewater treatment, so as to reduce Treatment cost, good effect, high retention effect

Active Publication Date: 2016-03-09
NANJING TONGCHANG NEW MATERIAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that rare earth wastewater is difficult to treat, ammonium sulfate in wastewater cannot be recycled, and resources are wasted

Method used

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  • An ion-type rare earth mine wastewater membrane separation technology treatment method and device
  • An ion-type rare earth mine wastewater membrane separation technology treatment method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The ionic rare earth mine wastewater is pumped from the adjustment tank into the ceramic membrane equipment (the adjustment tank at this time also has a clarification function to remove large particles of solids) for removal and filtration of suspended solids. The ceramic membrane is controlled at a pressure of 0.2MPa, a flow velocity of 3m / s on the membrane surface, and a normal temperature. The material of the ceramic membrane is zirconia, and the average pore size is 0.2μm; The period is 30 minutes; the operation adopts continuous constant flow operation, and when the solid content in the dope reaches wt3%, constant concentration multiple filtration is carried out. The solid content of suspended solids in the clear liquid of the ceramic membrane is below 0.5NTU, which meets the requirements for entering nanofiltration membranes and reverse osmosis membranes.

[0048] The supernatant of the ceramic membrane is pumped into the nanofiltration membrane to separate the ra...

Embodiment 2

[0051] The ionic rare earth mine wastewater is pumped from the adjustment tank into the ceramic membrane equipment (the adjustment tank at this time also has a clarification function to remove large particles of solids) for removal and filtration of suspended solids. The ceramic membrane is controlled at a pressure of 0.2MPa, a flow velocity of 2m / s on the membrane surface, and a normal temperature. The material of the ceramic membrane is zirconia, and the average pore size is 0.05μm; The period is 45 minutes; the operation adopts continuous constant flow operation, and when the solid content in the dope reaches wt3.3%, constant concentration multiple filtration is carried out. The solid content of suspended solids in the clear liquid of the ceramic membrane is below 0.5NTU, which meets the requirements for entering nanofiltration membranes and reverse osmosis membranes.

[0052] The supernatant of the ceramic membrane is pumped into the nanofiltration membrane to separate the...

Embodiment 3

[0055] The ionic rare earth ore wastewater is pre-filtered through the quartz sand filter, and then enters the ceramic membrane equipment for removal and filtration of suspended solids. The ceramic membrane is controlled at a pressure of 0.2MPa, a membrane surface flow velocity of 2.5m / s, and a normal temperature. The material of the ceramic membrane is zirconia, and the average pore size is 0.05μm; the ceramic membrane has a timing recoil process, and the recoil time is 5s. The flushing period is 30 minutes; the operation adopts continuous constant flow operation, and when the solid content in the dope reaches wt3.8%, constant concentration multiple filtration (diafiltration) is carried out. The solid content of suspended solids in the clear liquid of the ceramic membrane is below 0.5NTU, which meets the requirements for entering nanofiltration membranes and reverse osmosis membranes.

[0056] The supernatant of the ceramic membrane is pumped into the nanofiltration membrane ...

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Abstract

The invention relates to a membrane separation technology treatment method and device for ionic rare earth mine wastewater, belonging to the field of water treatment. The method comprises the following steps: step 1, pre-removing impurities from ionic rare earth mine wastewater to obtain a clear solution; step 2, filtering the clear solution with a ceramic membrane to obtain a ceramic membrane clear solution and a ceramic membrane dope; step 3, The ceramic membrane clear liquid is concentrated with a nanofiltration membrane, and the nanofiltration concentrated liquid and the nanofiltration liquid are concentrated; the fourth step is to adjust the nanofiltration liquid to pH=3 to 5 with dilute sulfuric acid, and then concentrate it with a reverse osmosis membrane to obtain Reverse osmosis serum and reverse osmosis concentrate. The present invention adopts the membrane separation technology to treat the ionic rare earth mine wastewater, which not only makes the mine wastewater purified, meets the discharge requirements, and is beneficial to environmental protection; but also enables the trace rare earth ions and ammonium sulfate in the wastewater to be well recycled and recycled. Valuable resources, with good economic and environmental benefits.

Description

technical field [0001] The present invention relates to a treatment method and device of membrane separation technology for ionic rare earth mine wastewater, in particular to a process for treating ionic rare earth mine wastewater that uses membrane separation technology as the core process and integrates membrane separation and traditional techniques. Wastewater treatment field. Background technique [0002] Southern ionic rare earth mines have been mined in my country since the 1970s. After more than 30 years of development, the mining process has developed from the most primitive "pool leaching process" to the existing "in-situ leaching process". The agent was also changed from sodium chloride to ammonium sulfate. This transformation is friendly to the environment. First, it avoids the large-scale ore mining "Mountain Movement" and protects the vegetation on the surface of the mine; second, the use of ammonium sulfate leaching agent also prevents the weathering of the min...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCC02F1/44C02F1/441C02F1/442C02F1/66C02F9/00C02F2103/10C02F2301/08
Inventor 王志高彭文博王金荣张建嵩张宏范克银
Owner NANJING TONGCHANG NEW MATERIAL RES INST CO LTD
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