CN110714131B - Air pre-oxidation method for in-situ leaching uranium mining - Google Patents

Air pre-oxidation method for in-situ leaching uranium mining Download PDF

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CN110714131B
CN110714131B CN201911012306.8A CN201911012306A CN110714131B CN 110714131 B CN110714131 B CN 110714131B CN 201911012306 A CN201911012306 A CN 201911012306A CN 110714131 B CN110714131 B CN 110714131B
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CN110714131A (en
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廖文胜
谭亚辉
王立民
杜志明
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Beijing Research Institute of Chemical Engineering and Metallurgy of CNNC
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Beijing Research Institute of Chemical Engineering and Metallurgy of CNNC
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B60/00—Obtaining metals of atomic number 87 or higher, i.e. radioactive metals
    • C22B60/02—Obtaining thorium, uranium, or other actinides
    • C22B60/0204—Obtaining thorium, uranium, or other actinides obtaining uranium
    • C22B60/0217—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes
    • C22B60/0221—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching

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Abstract

The invention relates to the technical field of in-situ leaching uranium mining, and particularly discloses an air pre-oxidation method for in-situ leaching uranium mining, which comprises the following steps: step 1: estimating the total demand of pre-oxidation air; step 2: selecting an injection well; and step 3: pre-oxidizing in air; and 4, step 4: and finishing the pre-oxidation. The method can rapidly oxidize uranium minerals by gas-liquid mixing and adopting air as an oxidant, thereby enhancing the leaching effect.

Description

Air pre-oxidation method for in-situ leaching uranium mining
Technical Field
The invention belongs to the technical field of in-situ leaching uranium mining, and particularly relates to an air pre-oxidation method for in-situ leaching uranium mining.
Background
In the process of in-situ leaching uranium mining, O is often adopted2As oxidant, the uranium mineral is oxidized into soluble hexavalent uranium. However, O2The water solubility is low, the dissolution speed is slow, and the water-soluble polymer is easy to become small bubbles in an ore bed. Because the gas density is small, oxygen bubbles which are not easy to dissolve can float upwards in the ore bed and are gradually consumed at the upper part of the ore bed, and the dilution and the oxygen consumption of the leaching agent are increased. The consumption of oxygen is great for uranium deposits with thin ore beds, thick water-bearing layers and good permeability.
The method is characterized in that air pre-oxidation is utilized, namely, air is injected into an ore bed in a large discharge amount, underground water is emptied, and the air is in contact with ore and oxidized to reduce oxygen consumption, and the method has proved to have good oxidation effect [ Su study bin and the like, in-situ uranium leaching field test of an air pre-oxidized ore bed of uranium mine in Xinjiang, metal mine, 2006 12: 33-36]. However, it is generally accepted that air pre-oxidation is only suitable for shallow burial of mineral deposits, and deep burial of mineral deposits is not suitable due to large and long air usage [ physico-chemical geological processes for uranium gold deposit development in the region of jolsdorf, kezilerkom, atomic energy press, 2003 ].
China has a plurality of sandstone uranium deposits which are buried deeply, have thick water-containing layers and have relatively good permeability. The development of such deposits tends to result in more dilute leachants, higher oxygen consumption, and relatively difficult leaching.
Therefore, it is desirable to employ a suitable pre-oxidation process to reduce the dilution of the leachant and the consumption of oxygen and to increase leaching efficiency.
Disclosure of Invention
The invention aims to provide an air pre-oxidation method for in-situ leaching uranium mining, which uses air as an oxidant, mixes the air with a leaching solution, performs air pre-oxidation, and simultaneously uses insoluble nitrogen in the air to plug an upper water-bearing layer of an ore layer so as to reduce reagent consumption and improve leaching strength.
The technical scheme of the invention is as follows:
an air pre-oxidation method for in-situ leaching uranium mining comprises the following steps:
step 1: estimating total pre-oxidation air demand
According to the pore volume V of the aquifer at the upper part of the ore bed, multiplying the ore bed pressure P and the porosity correction coefficient gamma, and estimating the total air demand;
step 2: selective injection well
Selecting single liquid injection well capable of performing air pre-oxidation, wherein the minimum liquid injection amount is more than 0.5m3H, gas injection amount is more than or equal to 0.5m3/h；
And step 3: air pre-oxidation
After the pumping and injecting circulation is started, air is filtered, deoiled and dried by an air compressor and an air bag, and is mixed with a leaching agent metered by an electromagnetic flowmeter in a gas-liquid mode after being metered by a gas flowmeter;
controlling the air injection pressure to be more than 0.4MPa initially, regulating the total injection pressure of an injection well valve to be more than 0.3MPa, mixing the injection and the injected gas according to the proportion of 1:1, and injecting;
after the liquid injection amount is basically unchanged for 0.5h, the liquid injection amount is increased by 0.1m3The gas injection amount per hour is increased by 0.1m after the liquid injection amount is basically unchanged for 0.5 hour3Gas injection amount per hour; gradually increasing the gas injection amount in this way, until the gas injection amount is increased for the last time, the liquid injection amount is obviously reduced within 0.5h, which indicates that gas blockage begins to exist, reducing the gas injection amount increased for the last time, and simultaneously maintaining liquid injection until the gas blockage is gradually eliminated;
then improving the power of a liquid injection pump, improving the liquid injection pressure by 0.1-0.2 MPa, increasing the gas injection quantity according to the method until the liquid injection pressure is improved to 1.0-1.5 MPa, enabling the gas injection quantity to be maximum at the moment, and injecting a leaching agent after gas-liquid mixing into an ore bed through a liquid injection well for pre-oxidation leaching;
estimating the number of days of pre-oxidation according to the estimated value of the total air demand and the air injection amount per hour, and making monitoring preparation;
and 4, step 4: end of pre-oxidation
When the concentration of dissolved oxygen in the leachate reaches 10mg/L or obvious bubbles are found in the leachate during sampling, stopping adding air, ending pre-oxidation, then injecting a leaching agent, and producing according to a normal leaching process.
And 3, if the gas blockage cannot be eliminated even if the gas injection quantity increased for the last time is reduced, closing the gas injection valve, exhausting gas at the wellhead, and injecting again according to the gas injection quantity which does not generate the gas blockage for the last time before the gas blockage is generated after the gas blockage is eliminated.
And 3, controlling the air injection pressure to be more than 0.05MPa greater than the liquid injection pressure in the whole process of the step 3.
In step 3, the initial injection is performed at 1m3Liquid addition 1m under standard conditions3The proportion of air is added.
In the step 1, a calculation formula for estimating the total demand of the pre-oxidation air is as follows:
P×V×γ×10＝P×(H×S×Φ)×γ×10，
in the formula:
p is the pressure of the ore bed, MPa;
v-pore volume of the upper aquifer of the mineral bed, m3：
Gamma-porosity correction coefficient, taking 0.05-0.2 according to pore size distribution;
h-thickness of water-containing layer on the upper part of the ore bed, m;
s-area of preoxidized ore body plane, m2；
Phi-core porosity,%.
In step 4, the leaching agent is CO2+O2。
The invention has the following remarkable effects:
(1) the method can rapidly oxidize uranium minerals by gas-liquid mixing and adopting air as an oxidant, thereby enhancing the leaching effect.
(2) The invention utilizes the characteristic of poor solubility of nitrogen to float and block the aquifer at the upper part of the ore bed in the ore bed, thereby reducing the dilution of the leaching agent and reducing the consumption of the agent.
(3) The method of the invention ensures that the air injection quantity is maximum according to the normal leaching injection pressure of each mine at present between 1.0MPa and 1.5MPa, and finishes pre-oxidation and plugging of an upper ore bed at the highest speed.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
An air pre-oxidation method for in-situ leaching uranium mining comprises the following steps:
step 1: estimating total pre-oxidation air demand
The total air demand can be estimated by multiplying the pore volume V of the aquifer at the upper part of the seam by the pressure P of the seam and the porosity correction coefficient gamma:
P×V×γ×10＝P×(H×S×Φ)×γ×10
in the formula:
p is the pressure of the ore bed, MPa;
v-pore volume of the upper aquifer of the mineral bed, m3：
Gamma-porosity correction coefficient, taking 0.05-0.2 according to pore size distribution;
h-thickness of water-containing layer on the upper part of the ore bed, m;
s-area of preoxidized ore body plane, m2；
Phi-core porosity,%.
Step 2: selective injection well
The in-situ leaching uranium extraction and injection well pattern for air pre-oxidation has a certain gas injection amount and is not easy to form gas blockage, and the minimum injection amount of a selected single liquid injection well is more than 0.5m3H, gas injection amount is more than or equal to 0.5m3/h。
And step 3: air pre-oxidation
After the pumping and injecting circulation is started, air is filtered, deoiled and dried by an air compressor and an air bag, the air is metered by a gas flowmeter and then is mixed with a leaching agent metered by an electromagnetic flowmeter in a gas-liquid mode, and the air injection pressure is controlled to be more than 0.05MPa greater than the liquid injection pressure in the whole process;
controlling the air injection pressure to be more than 0.4MPa initially and the total injection pressure of the injection well valve to be more than 0.3MPa, mixing the injection and the injected gas according to the proportion of 1:1, and injecting the mixture, namely injecting1m3Liquid addition 1m under standard conditions3Air;
after the liquid injection amount is basically unchanged for 0.5h, the liquid injection amount is increased by 0.1m3The gas injection amount per hour is increased by 0.1m after the liquid injection amount is basically unchanged for 0.5 hour3Gas injection amount per hour; gradually increasing the gas injection amount in this way, until the gas injection amount is increased for the last time, the liquid injection amount is obviously reduced within 0.5h, which indicates that gas blockage begins to exist, reducing the gas injection amount increased for the last time, and simultaneously maintaining liquid injection until the gas blockage is gradually eliminated; if the gas blockage can not be eliminated, closing the gas injection valve, exhausting gas at the wellhead, and injecting again according to the gas injection quantity which does not generate the gas blockage at the last time before the gas blockage occurs after the gas blockage is eliminated;
and then improving the power of a liquid injection pump, improving the liquid injection pressure by 0.1-0.2 MPa, increasing the gas injection amount according to the method until the liquid injection pressure is improved to 1.0-1.5 MPa, enabling the gas injection amount to be maximum at the moment, and injecting the leaching agent after gas-liquid mixing into the ore bed through a liquid injection well for pre-oxidation leaching.
And estimating the number of days of pre-oxidation according to the estimated value of the total air demand and the air injection amount per hour, and preparing for monitoring.
And 4, step 4: end of pre-oxidation
When the concentration of dissolved oxygen in the leachate reaches 10mg/L or obvious bubbles are found in the leachate during sampling, stopping adding air, ending pre-oxidation, then injecting a leaching agent, and producing according to a normal leaching process.
Example 1
The uranium leaching ore deposit is buried in a place with the depth of about 330 m, the well type is 5-point type, the well spacing is 25m, the water layer thickness at the upper part of the ore deposit is 10m, the average porosity is 40 percent, and CO is adopted2+O2And (4) process mining. The air pre-oxidation is implemented according to the following steps:
step 1: estimating total pre-oxidation air demand
And (3) estimating the gas injection quantity according to the pore volume V of the aquifer at the upper part of the ore bed, multiplied by the ore bed pressure P and the porosity correction coefficient gamma:
P×V×γ×10＝P×(H×S×Φ)×γ×10
in the formula (I), the compound is shown in the specification,the pressure was measured at 3.2MPa and the porosity correction factor was measured at 0.1. The pore volume of the upper aquifer of the ore bed is calculated to be about 5000m316000m3Air.
Step 2: selective injection well
The minimum injection amount of each injection well in the test area is more than 1.0m3H, can ensure that the gas injection quantity is more than 0.5m3H is used as the reference value. Thus, all injection wells are subjected to gas injection operations.
And step 3: air pre-oxidation
After the pumping and injecting circulation is started, air passes through an air compressor, an air bag, filtration, oil removal and drying, is metered by a gas flowmeter and then is mixed with a leaching agent metered by an electromagnetic flowmeter in a gas-liquid mode, and the injection pressure of the air is controlled to be more than 0.05MPa greater than the injection pressure;
controlling the initial air pressure to be more than 0.4MPa, adjusting the valve of the liquid injection well to control the total liquid injection pressure to be more than 0.3MPa, mixing the liquid injection and the injected gas according to the proportion of 1:1, and injecting the mixture, namely injecting the mixture every 1m3Liquid addition 1m under standard conditions3Air.
When the liquid injection amount is basically unchanged after 0.5h, the liquid injection amount is increased by 0.1m3The amount of air injected is increased by 0.1m after the amount of air injected is basically unchanged for 0.5h3Gas injection quantity per hour. The gas injection amount is gradually increased until the gas injection amount is obviously reduced within 0.5h after the gas injection amount is increased for the last time, which indicates that gas blockage begins to occur, the increased gas injection amount is reduced, the liquid injection is maintained, and the gas blockage is gradually eliminated; if the gas blockage can not be eliminated, the gas injection valve is required to be closed, gas is exhausted at the wellhead, and after the gas blockage is eliminated, the gas is injected again according to the gas injection quantity which does not generate the gas blockage at the last time before the gas blockage occurs;
and then increasing the power of the liquid injection pump, increasing the liquid injection pressure by 0.1-0.2 MPa, and increasing the gas injection amount according to the method until the pressure is increased to 0.6MPa, so that the gas injection amount is maximum.
Under the condition of stable gas injection and liquid injection, the minimum gas injection amount of a single well is more than 0.5m3H, average gas amount of 2.0m3H, average injected liquid amount 1.8m3/h。
And 4, step 4: end of pre-oxidation
After 30 days of liquid injection, the dissolved oxygen amount is increased to 2 mg/L; after 60 days of liquid injection, the liquid is increased to 6mg/L, and a small amount of insoluble gas exists in the leaching liquid; the injection liquid is increased to 8mg/L for 80 days, the uranium concentration is increased to 2mg/L, and the insoluble gas is obviously increased. Stopping injecting air, changing to injecting oxygen and carbon dioxide, and producing according to the normal leaching process.
In the pre-oxidation process, about 15500 square of air is co-injected.
Example 2
The uranium leaching ore deposit is buried in a place with the depth of about 320 m, the well type is 5-point type, the well spacing is 25m, the water layer thickness at the upper part of the ore deposit is 100 m, the average porosity is 30 percent, and CO is adopted2+O2And (4) process mining. The air pre-oxidation is implemented according to the following steps:
step 1: estimating total pre-oxidation air demand
And (3) estimating the gas injection quantity according to the pore volume V of the aquifer at the upper part of the ore bed, multiplied by the ore bed pressure P and the porosity correction coefficient gamma:
P×V×γ×10＝P×(H×S×Φ)×γ×10
wherein the pressure is 2.7MPa and the porosity correction factor is 0.05. The pore volume of the upper aquifer of the mineral layer is calculated to be about 37500m350625m is required3Air.
Step 2: selective injection well
The minimum injection amount of each injection well in the test area is more than 1.0m3H, can ensure that the gas injection quantity is more than 0.5m3H is used as the reference value. Thus, all injection wells are subjected to gas injection operations.
And step 3: air pre-oxidation
After the pumping and injecting circulation is started, air passes through an air compressor, an air bag, filtration, oil removal and drying, is metered by a gas flowmeter and then is mixed with a leaching agent metered by an electromagnetic flowmeter in a gas-liquid mode, and the injection pressure of the air is controlled to be more than 0.05MPa greater than the injection pressure;
the initial control air pressure is more than 0.8MPa, the total injection pressure of the injection well valve is adjusted to be more than 0.7MPa, and the injection is carried out after mixing according to the proportion of injection and gas injection 1:1, namely, 1m of injection is carried out every time3Liquid addition 1m under standard conditions3Air.
When the liquid injection amount is basically unchanged after 0.5h, the liquid injection amount is increased by 0.1m3The amount of air injected is increased by 0.1m after the amount of air injected is basically unchanged for 0.5h3Gas injection quantity per hour. And increasing the gas injection amount step by step until the gas injection amount is obviously reduced within 0.5h after the last gas injection amount is increased, indicating that gas blockage begins to exist, reducing the last increased gas injection amount, maintaining the liquid injection, and waiting for the gas blockage to be gradually eliminated.
And then increasing the power of the liquid injection pump, increasing the liquid injection pressure by 0.1-0.2 MPa, and increasing the gas injection amount according to the method until the pressure is increased to 1.0MPa, so that the gas injection amount is maximum.
Under the condition of stable gas injection and liquid injection, the minimum gas injection amount of a single well is more than 1.0m3H, average gas amount 4.5m3H, average injected liquid amount 2.0m3/h。
And 4, step 4: end of pre-oxidation
After 60 days of liquid injection, the dissolved oxygen is increased to 6mg/L, and a small amount of insoluble gas exists in the leaching liquid; the injection liquid is increased to 10mg/L in 100 days, the uranium concentration is increased to 2mg/L, and the insoluble gas is obviously increased. Stopping injecting air, changing to injecting oxygen and carbon dioxide, and producing according to the normal leaching process.
In the pre-oxidation process, about 40000 square of air is co-injected.
Example 3
The uranium leaching ore deposit is buried in a place with the depth of 350 m, the well type is 5-point type, the well spacing is 30 m, the water layer thickness at the upper part of the ore deposit is 15 m, the average porosity is 35 percent, and CO is adopted2+O2And (4) process mining. The air pre-oxidation is implemented according to the following steps:
step 1: estimating total pre-oxidation air demand
And (3) estimating the gas injection quantity according to the pore volume V of the aquifer at the upper part of the ore bed, multiplied by the ore bed pressure P and the porosity correction coefficient gamma:
P×V×γ×10＝P×(H×S×Φ)×γ×10
wherein the pressure is 3.4MPa and the porosity correction factor is 0.2. The calculated pore volume of the aquifer at the upper part of the mineral bed is about 9450m3Need 64260m3Air.
Step 2: selective injection well
The minimum injection amount of each injection well in the test area is more than 1.0m3H, can ensure that the gas injection quantity is more than 0.5m3H is used as the reference value. Thus, all injection wells are subjected to gas injection operations.
And step 3: air pre-oxidation
After the pumping and injecting circulation is started, air passes through an air compressor, an air bag, filtration, oil removal and drying, is metered by a gas flowmeter and then is mixed with a leaching agent metered by an electromagnetic flowmeter in a gas-liquid mode, and the injection pressure of the air is controlled to be more than 0.05MPa greater than the injection pressure;
controlling the initial air pressure to be more than 0.6MPa and regulating the total injection pressure of the injection well valve to be more than 0.5MPa, mixing the injection and the injected gas according to the proportion of 1:1, namely injecting 1m of the injected gas every time3Liquid addition 1m under standard conditions3Air.
When the liquid injection amount is basically unchanged after 0.5h, the liquid injection amount is increased by 0.1m3The amount of air injected is increased by 0.1m after the amount of air injected is basically unchanged for 0.5h3Gas injection quantity per hour. And increasing the gas injection amount step by step until the gas injection amount is obviously reduced within 0.5h after the last gas injection amount is increased, indicating that gas blockage begins to exist, reducing the last increased gas injection amount, maintaining the liquid injection, and gradually eliminating the gas blockage.
And then increasing the power of the liquid injection pump, increasing the liquid injection pressure by 0.1-0.2 MPa, and increasing the gas injection amount according to the method until the pressure is increased to 0.8MPa, so that the gas injection amount is maximum.
Under the condition of stable gas injection and liquid injection, the minimum gas injection amount of a single well is more than 1.5m3H, average gas amount of 5.0m3H, average injected liquid amount 2.4m3/h。
And 4, step 4: end of pre-oxidation
After 40 days of liquid injection, the dissolved oxygen amount is increased to 2 mg/L; after the liquid is injected for 80 days, the dissolved oxygen is increased to 6mg/L, and a small amount of insoluble gas exists in the leaching liquid; the injection liquid is increased to 10mg/L in 110 days, the uranium concentration is increased to 5mg/L, and the insoluble gas is obviously increased. Stopping injecting air, changing to injecting oxygen and carbon dioxide, and producing according to the normal leaching process.
During the pre-oxidation process, about 55000 square of air is co-injected.

Claims (5)

1. An air pre-oxidation method for in-situ leaching uranium mining is characterized by comprising the following steps: the method comprises the following steps:
step 1: estimating total pre-oxidation air demand
According to the pore volume V of the aquifer at the upper part of the ore bed, multiplying the ore bed pressure P and the porosity correction coefficient gamma, and estimating the total air demand;
the calculation formula for estimating the total demand of the pre-oxidation air is as follows:
P×V×γ×10＝P×(H×S×Φ)×γ×10，
in the formula:
p is the pressure of the ore bed, MPa;
v-pore volume of the upper aquifer of the mineral bed, m3：
Gamma-porosity correction coefficient, taking 0.05-0.2 according to pore size distribution;
h-thickness of water-containing layer on the upper part of the ore bed, m;
s-area of preoxidized ore body plane, m2；
Φ — core porosity,%;
step 2: selective injection well
Selecting single liquid injection well capable of performing air pre-oxidation, wherein the minimum liquid injection amount is more than 0.5m3H, gas injection amount is more than or equal to 0.5m3/h；
And step 3: air pre-oxidation
After the pumping and injecting circulation is started, air is filtered, deoiled and dried by an air compressor and an air bag, and is mixed with a leaching agent metered by an electromagnetic flowmeter in a gas-liquid mode after being metered by a gas flowmeter;
controlling the air injection pressure to be more than 0.4MPa initially, regulating the total injection pressure of an injection well valve to be more than 0.3MPa, mixing the injection and the injected gas according to the proportion of 1:1, and injecting;
after the liquid injection amount is not changed for 0.5h, the liquid injection amount is increased by 0.1m3The gas injection amount per hour is increased by 0.1m after the liquid injection amount is unchanged for 0.5 hour3Gas injection amount per hour; the amount of injected gas is gradually increased in such a way until the last injection is increasedAfter the gas flow, the liquid injection amount is obviously reduced within 0.5h, which indicates that gas blockage begins, the gas injection amount increased at the last time is reduced, and the liquid injection is maintained at the same time until the gas blockage is gradually eliminated; then, the power of the liquid injection pump is increased, and the liquid injection pressure is increased by 0.1-0.2 MPa;
gradually increasing the gas injection amount and the liquid injection pressure according to the method until the liquid injection pressure is increased to 1.0-1.5 MPa, enabling the gas injection amount to be maximum at the moment, and injecting the leaching agent after gas-liquid mixing into the ore bed through the liquid injection well for pre-oxidation leaching;
estimating the number of days of pre-oxidation according to the estimated value of the total air demand and the air injection amount per hour, and making monitoring preparation;
and 4, step 4: end of pre-oxidation
When the concentration of dissolved oxygen in the leachate reaches 10mg/L or obvious bubbles are found in the leachate during sampling, stopping adding air, ending pre-oxidation, then injecting a leaching agent, and producing according to a normal leaching process.
2. The air pre-oxidation method for in-situ leaching uranium mining according to claim 1, characterized in that: and 3, if the gas blockage cannot be eliminated even if the gas injection quantity increased for the last time is reduced, closing the gas injection valve, exhausting gas at the wellhead, and injecting again according to the gas injection quantity which does not generate the gas blockage for the last time before the gas blockage is generated after the gas blockage is eliminated.
3. The air pre-oxidation method for in-situ leaching uranium mining according to claim 1, characterized in that: and 3, controlling the air injection pressure to be more than 0.05MPa greater than the liquid injection pressure in the whole process of the step 3.
4. The air pre-oxidation method for in-situ leaching uranium mining according to claim 1, characterized in that: in step 3, the initial injection is performed at 1m3Liquid addition 1m under standard conditions3The proportion of air is added.
5. The air pre-oxidation method for in-situ leaching uranium mining according to claim 1, characterized in that: in step 4, the leaching agent is CO2+O2。
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