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Residual acid flowback method after acid method hole-flushing in-situ leach of uranium

A technology for in-situ leaching and uranium mining, which is applied in drilling compositions, chemical instruments and methods, and earth-moving drilling and mining, etc., can solve the problems of difficulty in reflowing residual acid, poor stability, etc., so as to improve hole washing efficiency and improve The efficiency of flowback and the effect of thorough sand cleaning

Active Publication Date: 2014-06-18
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

However, the residual acid flowback often has a high acidity, and the foam liquid is an anionic surfactant, which has poor stability in the acid solution, making it very difficult to flow back the residual acid in the foam.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Hole S31 of an in-situ leaching deposit was used, the hole depth was 185.77 meters, and the static water level in the hole was 88.32 meters. Its initial pumping volume is only 0.98m 3 / h, use acidification to wash holes and inject 1.5m acid 3 .

[0022] The method is carried out according to the following steps, and the whole washing process takes about 8 hours:

[0023] (1) Inject strong alkaline foam liquid into the pumping hole and / or liquid injection hole after pickling to wash the hole, and then perform foam liquid backflow; the strong alkaline foam liquid is an aqueous solution, which contains 0.4% by mass % of sodium alkylbenzene sulfonate, mass percent is 0.1% carboxymethyl cellulose, then adjust the pH value to 13 with sodium hydroxide;

[0024] The strong alkaline foam liquid is mixed with air to form foam before being injected into the pumping hole and / or the liquid injection hole, the gas-liquid volume ratio is 80:1, and the gas flow rate should make the ...

Embodiment 2

[0031] This example adopts hole S71 in an in-situ leaching deposit, the drilling depth is 180.0 meters, and the static water level in the hole is 87 meters. The pumping volume before washing the hole is 1.35m 3 / h, using the acid method to wash the holes and inject 150L of acid.

[0032] The method is carried out according to the following steps, and the whole washing process takes about 8 hours:

[0033] (1) Inject strong alkaline foam liquid into the pumping hole and / or liquid injection hole after pickling to wash the hole, and then carry out foam liquid backflow; the strong alkaline foam liquid is an aqueous solution, which contains 0.3% by mass % fatty alcohol polyoxyethylene ether sodium sulfate, mass percent are 0.05% carboxymethyl cellulose, then adjust the pH value to 12 with sodium hydroxide;

[0034] The strong alkaline foam solution is mixed with air to form foam before being injected into the pumping hole and / or the liquid injection hole, the gas-liquid volume ra...

Embodiment 3

[0041] This example adopts hole S113 in an in-situ leaching deposit, the drilling depth is 179.5 meters, and the static water level in the hole is 89 meters. The pumping volume before washing the hole is 1.26m 3 / h, using the acid method to wash the holes and inject 250L of acid.

[0042] The method is carried out according to the following steps, and the whole washing process takes about 10 hours:

[0043] (1) Inject strong alkaline foam liquid into the pumping hole and / or liquid injection hole after pickling to wash the hole, and then carry out foam liquid backflow; the strong alkaline foam liquid is an aqueous solution, which contains 0.5% by mass % of sodium alkylbenzene sulfonate and fatty alcohol polyoxyethylene ether sodium sulfate, mass percent is 0.2% carboxymethyl cellulose, then adjust the pH value to 13 with sodium hydroxide;

[0044] The strong alkaline foam solution is mixed with air to form foam before being injected into the liquid suction hole and / or liquid ...

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Abstract

The invention provides a residual acid flowback method after acid method hole-flushing in-situ leach of uranium. The flowback method comprises the steps of firstly using strong alkaline foam liquid with the pH value of 12 to 13 to flush a liquid drainage hole and / or a liquid injection hole, and allowing the foam fluid to flow back; then using alkaline foam liquid with the pH value of 10 to 11 to flush the liquid drainage hole and / or the liquid injection hole, and allowing the foam fluid to flow back; and finally using foam liquid with the pH value of 8 to 9 to flush the liquid drainage hole and / or the liquid injection hole, and allowing the foam fluid to flow back. The residual acid flowback method after acid method hole-flushing in-situ leach of uranium provided by the invention adjusts the alkalinity of conventional foam liquid to adapt to the requirement of the foam performance in residual acid flowback, thus the backflow is in the form of foam, the hole-flushing efficiency is improved, settling sand is thoroughly flushed, and the demand of in-situ leaching uranium is satisfied.

Description

technical field [0001] The invention relates to a method for cleaning boreholes in the process of in-situ leaching for uranium mining, in particular to a cleaning treatment method for residual acid flowback and sand settling after hole extraction and hole injection acid washing. Background technique [0002] There are many low-permeability sandstone-type uranium deposits in my country, and the water pumping and injection volume of the deposits is generally small. In addition, during the mining process, due to the damage of construction operations, the permeability of the ore seam will also be reduced, and the water volume of the injection hole will be reduced. For the above situation, hole washing, especially acid washing, acidizing, etc. are usually used to increase the water inflow of the well hole. [0003] The residual acid after uranium acid washing and acidification by in-situ leaching needs to be flowbacked. After the flowback is clean, the amount of pumping and inje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B37/06C09K8/52
Inventor 廖文胜王立民江国平
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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