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Device and method for accelerating evaporation of acid in-situ leaching uranium mining evaporation pond waste liquid

A technology of in-situ leaching for uranium mining and evaporation pools, which is applied in mining wastewater treatment, heating water/sewage treatment, radioactive pollutants, etc., can solve problems such as high risk of leakage, damage to surface vegetation, and difficulty in surface restoration, achieving savings Effects of construction cost, reduced footprint, and faster evaporation

Inactive Publication Date: 2019-04-16
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the amount of wastewater to be treated, the area of ​​the evaporation pool can reach several mu, tens of mu or even more. When constructing the evaporation pool, a large area of ​​ground needs to be broken, and the vegetation on the surface will be destroyed. The risk of leakage during use is high, and it is difficult to restore the surface after decommissioning.
On the other hand, large-scale evaporation ponds need to invest in land acquisition, land rent, construction and maintenance costs

Method used

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  • Device and method for accelerating evaporation of acid in-situ leaching uranium mining evaporation pond waste liquid

Examples

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Effect test

Embodiment 1

[0042] In a uranium mine in Inner Mongolia, the average annual evaporation is 2449mm, and the average annual rainfall is 185mm. The uranium leaching unit is 1 pumping and 4 injections, and the pumping volume is 10m after reaching the pumping balance. 3 / h, leachate pH=2.0, dosing liquid sulfuric acid concentration is 10g / L, adopts the acid method ground leaching mining uranium of the present invention to utilize the concentrated sulfuric acid dilution exothermic method to accelerate waste water evaporation and comprise the following steps:

[0043] 1) 92.5% industrial sulfuric acid and adsorption tail liquid from the sulfuric acid storage tank are passed into the mixing chamber of the graphite heat exchanger, the sulfuric acid flow rate is 100kg / h, the adsorption tail liquid flow rate is 200L / h, and the system temperature is 20°C. After dilution, the temperature of the sulfuric acid solution rose to 71°C.

[0044] 2) The diluted sulfuric acid solution flows into the liquid mix...

Embodiment 2

[0050] In an acid leaching uranium mine in Inner Mongolia, the average annual evaporation is 1849mm, the average annual rainfall is 175mm, and the leaching unit has 2 pumps and 6 injections, and the pumping volume is 24m after the pumping balance is reached. 3 / h, the remaining acid in the leachate is 1g / L, and the sulfuric acid concentration of the dosing solution is 8g / L, adopting the acid method ground leaching mining uranium of the present invention utilizes the concentrated sulfuric acid dilution exothermic method to accelerate the waste water evaporation and comprises the following steps:

[0051] 1) 92.5% industrial sulfuric acid and adsorption tail liquid from the sulfuric acid storage tank are passed into the mixing chamber of the graphite heat exchanger, the sulfuric acid flow rate is 170kg / h, and the adsorption tail liquid flow rate is 170L / h. The system temperature is 10°C. After dilution, the temperature of the sulfuric acid solution rises to 80°C.

[0052] 2) Th...

Embodiment 3

[0058] In an acid leaching uranium mine in Xinjiang, the average annual evaporation is 2102 mm, the average annual rainfall is 120 mm, and the leaching unit has 6 pumps and 12 injections, and the pumping volume is 70 m after reaching the pumping balance. 3 / h, the remaining acid in the leachate is 2g / L, and the sulfuric acid concentration of the dosing solution is 5g / L, adopting the acid method ground leaching mining uranium of the present invention utilizes the concentrated sulfuric acid dilution exothermic method to accelerate the waste water evaporation and comprises the following steps:

[0059] 1) 92.5% industrial sulfuric acid and adsorption tail liquid from the sulfuric acid storage tank are passed into the graphite heat exchanger mixing chamber, the flow rate of sulfuric acid is 210kg / h, and the flow rate of adsorption tail liquid is 210L / h. The system temperature is 15°C. After dilution, the temperature of the sulfuric acid solution rises to 80°C.

[0060] 2) The dil...

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Abstract

The invention relates to a device and method for accelerating evaporation of an acid in-situ leaching uranium mining evaporation pond waste liquid. The device comprises a sulfuric acid dilution heat exchanger, wherein the sulfuric acid dilution heat exchanger is divided into a mixing chamber and a heat exchange chamber; a water inlet of the mixing chamber is connected with a tail liquid pipe usedfor receiving and adsorbing a tail liquid through a pipeline; an acid inlet of the mixing chamber is connected with an acid storage tank used for receiving concentrated sulfuric acid through a pipeline; a liquid outlet of the mixing chamber is connected with a fluid preparation pond through a pipeline. The device and method for accelerating the evaporation of the acid in-situ leaching uranium mining evaporation pond waste liquid have the advantages that the temperature of the wastewater in an evaporation pond before heating is 0-20 DEG C, and the temperature of the wastewater in the evaporation pond after heating is 30-90 DEG C; the evaporation of the wastewater after heating is accelerated; compared with natural evaporation alone, the area of the evaporation pond can be reduced to 20-90%,thereby not only reducing the floor space of the evaporation pond, but also greatly saving the construction cost of the evaporation pond.

Description

technical field [0001] The invention belongs to the field of environmental protection for uranium mining by in-situ leaching, and in particular relates to a device and method for accelerating the evaporation of waste liquid in an evaporation pool for uranium mining by acid-based in-situ leaching. Background technique [0002] In-situ leaching uranium mining has become an important method for mining sandstone-type uranium deposits in China, the United States, Kazakhstan, Uzbekistan, Australia and other countries. Sulfuric acid has the advantages of low price, stable properties, high leaching rate of uranium in ore, and easy procurement, so it has become the preferred leaching agent raw material for acid in-situ leaching of uranium. [0003] The mass concentration of industrial concentrated sulfuric acid is generally 92.5%. In the acid leaching uranium mine, the concentrated sulfuric acid is directly added from the acid storage tank through the pipeline to the liquid preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F103/10
CPCC02F1/04C02F2101/006C02F2103/10
Inventor 闻振乾姚益轩胥国龙张翀郑剑平李宏星高明哲
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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