CN110777272A - Use method of organic chlorine oxidant in neutral in-situ leaching uranium mining - Google Patents

Use method of organic chlorine oxidant in neutral in-situ leaching uranium mining Download PDF

Info

Publication number
CN110777272A
CN110777272A CN201911099702.9A CN201911099702A CN110777272A CN 110777272 A CN110777272 A CN 110777272A CN 201911099702 A CN201911099702 A CN 201911099702A CN 110777272 A CN110777272 A CN 110777272A
Authority
CN
China
Prior art keywords
leaching
concentration
oxidant
uranium
oxygen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911099702.9A
Other languages
Chinese (zh)
Inventor
邓锦勋
原渊
成弘
许影
赵利信
李建华
周根茂
程威
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Research Institute of Chemical Engineering and Metallurgy of CNNC
Original Assignee
Beijing Research Institute of Chemical Engineering and Metallurgy of CNNC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Research Institute of Chemical Engineering and Metallurgy of CNNC filed Critical Beijing Research Institute of Chemical Engineering and Metallurgy of CNNC
Priority to CN201911099702.9A priority Critical patent/CN110777272A/en
Publication of CN110777272A publication Critical patent/CN110777272A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention belongs to the technical field of in-situ leaching uranium mining, and particularly relates to a method for using an organic chlorine oxidant in neutral in-situ leaching uranium mining. Injecting carbon dioxide and oxygen into underground water to prepare a leaching agent, and controlling the pH of the leaching agent to be 6.8-7.5; when the uranium concentration of the leachate reaches the peak value and does not rise any more, stopping adding oxygen; adding sodium dichloroisocyanurate as an oxidant, and adding the prepared sodium dichloroisocyanurate solution into a liquid injection main pipe through a metering pump, wherein the mass concentration is 200-300 mg/L; monitoring the free chlorine concentration of the leachate, and when the free chlorine concentration is more than 20mg/L, reducing the mass concentration of the oxidant sodium dichloroisocyanurate to be 30-40% of the original mass concentration, namely 60-120 mg/L; and when the leaching rate of the block section is more than 70%, stopping adding the oxidant until the leaching process is finished. The method can overcome the defect that oxygen is used as an oxidant in neutral leaching uranium mining, effectively oxidize the tetravalent uranium in the ore, improve the uranium concentration in the leaching liquid, and shorten the leaching period of the ore.

Description

Use method of organic chlorine oxidant in neutral in-situ leaching uranium mining
Technical Field
The invention belongs to the technical field of in-situ leaching uranium mining, and particularly relates to a method for using an organic chlorine oxidant in neutral in-situ leaching uranium mining.
Background
The neutral in-situ leaching uranium mining method is suitable for sandstone type uranium deposit with high carbonate content, has the advantages of low leaching cost, high uranium concentration in the leaching solution, environmental protection and the like, and is mainly applied to in-situ leaching production in China and America. Uranium mineral part in sandstone-type uranium deposit exists in tetravalent form, oxidant is required to be added to oxidize tetravalent uranium to hexavalent state, and O is commonly used in neutral leaching mountains in China 2As an oxidizing agent. Under standard conditions, oxygen has a density of 1.429g/L and is soluble in water, but has little solubility. In the leaching process, the oxygen concentration is 300-500 mg/L, and the oxygen concentration is gradually reduced along with the leaching. The problems that oxygen has low solubility in water, is difficult to mix with underground water, has the solubility limited by the confined water head of the underground water and can generate air blockage when used in a low-permeability deposit are found in the use process. Sodium dichloroisocyanurate is an important N-chloroimide compound, has the characteristics of high content of available chlorine, high content of active chlorine, strong sterilizing bleaching power, long time for releasing free chlorine in water, stable storage, convenient use, safety, less discharge of three wastes in production and the like, and is a very potential uranium leaching oxidant.
Disclosure of Invention
The invention aims to provide a method for using an organic oxychlorination agent in neutral in-situ leaching uranium mining, which can overcome the defect that oxygen is used as an oxidant in neutral leaching uranium mining, effectively oxidize tetravalent uranium in ores, improve the uranium concentration in a leaching solution, shorten the leaching period of the ores, improve the leaching efficiency, and avoid adverse effects such as uranyl ion secondary precipitation, gas blockage and the like.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for using an organic chlorine oxidant in neutral leaching uranium mining,
the first step is as follows: injecting carbon dioxide and oxygen into underground water to prepare a leaching agent, and controlling the pH of the leaching agent to be 6.8-7.5;
the second step is that: when the uranium concentration of the leachate reaches the peak value and does not rise any more, stopping adding oxygen; adding sodium dichloroisocyanurate as an oxidant, and adding the prepared sodium dichloroisocyanurate solution into a liquid injection main pipe through a metering pump, wherein the mass concentration is 200-300 mg/L;
the third step: monitoring the free chlorine concentration of the leachate, and when the free chlorine concentration is more than 20mg/L, reducing the mass concentration of the oxidant sodium dichloroisocyanurate to be 30-40% of the original mass concentration, namely 60-120 mg/L;
the fourth step: and when the leaching rate of the block section is more than 70%, stopping adding the oxidant until the leaching process is finished.
The first step is as follows: the carbon dioxide addition concentration is 200-1200 mg/L, the oxygen addition concentration is 300-600 mg/L, and the carbon dioxide addition concentration is determined according to the content of bicarbonate in the underground water of the mineral-bearing aquifer of the ore deposit.
The second step is that: the oxygen addition was stopped after 10 days.
The beneficial effects obtained by the invention are as follows:
the method is used in-situ leaching uranium extraction tests and production of certain ore deposit, the uranium concentration of the leaching solution is high, the leaching period is shortened by more than 10%, the oxidation effect is very obvious, and gas blockage influencing the liquid pumping and injecting amount of a well site does not occur.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The use method of the organic chlorine oxidant in neutral leaching uranium mining comprises the following steps:
the first step is as follows: injecting carbon dioxide and oxygen into underground water to prepare a leaching agent, wherein the adding concentration of the carbon dioxide is 200-1200 mg/L, the adding concentration of the oxygen is 300-600 mg/L, the pH of the leaching agent is controlled to be 6.8-7.5 according to the content of bicarbonate in the underground water of the mineral-bearing aquifer of the ore deposit;
the second step is that: when the uranium concentration of the leachate reaches the peak value, the oxygen is not added any more, and the addition of the oxygen is stopped after 10 days. Adding sodium dichloroisocyanurate as an oxidant, and adding the prepared sodium dichloroisocyanurate solution into a liquid injection main pipe through a metering pump, wherein the mass concentration is 200-300 mg/L;
the third step: monitoring the free chlorine concentration of the leachate, and when the free chlorine concentration is more than 20mg/L, reducing the mass concentration of the oxidant sodium dichloroisocyanurate to be 30-40% of the original mass concentration, namely 60-120 mg/L;
the fourth step: and when the leaching rate of the block section is more than 70%, stopping adding the oxidant until the leaching process is finished.
Example 1
The uranium deposit ore body is mainly platy, the average thickness of the ore body is 2.0-4.5 m, the average grade is 0.020%, and the average amount of uranium per square meter is 2.083kg/m 2The average content of carbonate is 4.03%, and a neutral leaching process is suitable.
The first step is as follows: the bicarbonate concentration in the underground water is 1800mg/L, carbon dioxide and oxygen are injected into the underground water to prepare a leaching agent, the carbon dioxide addition concentration is 300mg/L, the oxygen addition concentration is 400mg/L, and the pH value of the leaching agent is about 7.2;
the second step is that: when the uranium concentration of the leachate reaches the peak value of 38.2mg/L, the oxygen is stopped being added after 10 days. Adding sodium dichloroisocyanurate as oxidant, adding the prepared sodium dichloroisocyanurate solution into a liquid injection header pipe through a metering pump, wherein the mass concentration is 220 mg/L;
the third step: monitoring the free chlorine concentration of the leachate, and when the free chlorine concentration reaches 21.0mg/L, reducing the concentration of the oxidant to 40 percent of the original concentration, namely 88 mg/L;
the fourth step: and when the leaching rate of the block section reaches 70.6%, stopping adding the oxidant until the uranium concentration of the leaching liquid is lower than 10mg/L, and finishing the leaching process.
Example 2
The uranium deposit ore body is mainly platy, the average thickness of the ore body is 6.19m, the average grade is 0.042%, and the average amount of uranium per square meter is 4.83kg/m 2The average content of carbonate is 2.58%, and a neutral leaching process is suitable.
The first step is as follows: the bicarbonate concentration in the underground water is 400mg/L, carbon dioxide and oxygen are injected into the underground water to prepare a leaching agent, the carbon dioxide addition concentration is 600mg/L, the oxygen addition concentration is 500mg/L, and the pH value of the leaching agent is about 6.8;
the second step is that: when the uranium concentration of the leachate reaches the peak value of 56.2mg/L, the oxygen is stopped being added after 10 days. Adding sodium dichloroisocyanurate as oxidant, adding the prepared sodium dichloroisocyanurate solution into a liquid injection header pipe through a metering pump, wherein the mass concentration is 260 mg/L;
the third step: monitoring the concentration of free chlorine in the leachate, and when the concentration of the free chlorine reaches 22.0mg/L, reducing the concentration of the oxidant to 35 percent of the original concentration, namely 90 mg/L;
the fourth step: and when the leaching rate of the block section reaches 72.0%, stopping adding the oxidant until the uranium concentration of the leaching liquid is lower than 10mg/L, and finishing the leaching process.

Claims (3)

1. A use method of an organic chlorine oxidant in neutral leaching uranium extraction is characterized in that:
the first step is as follows: injecting carbon dioxide and oxygen into underground water to prepare a leaching agent, and controlling the pH of the leaching agent to be 6.8-7.5;
the second step is that: when the uranium concentration of the leachate reaches the peak value and does not rise any more, stopping adding oxygen; adding sodium dichloroisocyanurate as an oxidant, and adding the prepared sodium dichloroisocyanurate solution into a liquid injection main pipe through a metering pump, wherein the mass concentration is 200-300 mg/L;
the third step: monitoring the free chlorine concentration of the leachate, and when the free chlorine concentration is more than 20mg/L, reducing the mass concentration of the oxidant sodium dichloroisocyanurate to be 30-40% of the original mass concentration, namely 60-120 mg/L;
the fourth step: and when the leaching rate of the block section is more than 70%, stopping adding the oxidant until the leaching process is finished.
2. The method for using the organochlorine oxidant in neutral in-situ uranium leaching according to claim 1, wherein the method comprises the following steps: the first step is as follows: the carbon dioxide addition concentration is 200-1200 mg/L, the oxygen addition concentration is 300-600 mg/L, and the carbon dioxide addition concentration is determined according to the content of bicarbonate in the underground water of the mineral-bearing aquifer of the ore deposit.
3. The method for using the organochlorine oxidant in neutral in-situ uranium leaching according to claim 1, wherein the method comprises the following steps: the second step is that: the oxygen addition was stopped after 10 days.
CN201911099702.9A 2019-11-12 2019-11-12 Use method of organic chlorine oxidant in neutral in-situ leaching uranium mining Pending CN110777272A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911099702.9A CN110777272A (en) 2019-11-12 2019-11-12 Use method of organic chlorine oxidant in neutral in-situ leaching uranium mining

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911099702.9A CN110777272A (en) 2019-11-12 2019-11-12 Use method of organic chlorine oxidant in neutral in-situ leaching uranium mining

Publications (1)

Publication Number Publication Date
CN110777272A true CN110777272A (en) 2020-02-11

Family

ID=69390416

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911099702.9A Pending CN110777272A (en) 2019-11-12 2019-11-12 Use method of organic chlorine oxidant in neutral in-situ leaching uranium mining

Country Status (1)

Country Link
CN (1) CN110777272A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111455173A (en) * 2020-04-24 2020-07-28 核工业北京化工冶金研究院 In-situ leaching uranium mining method for sandstone-type uranium deposit
CN115612869A (en) * 2022-09-27 2023-01-17 核工业北京化工冶金研究院 Secondary enhanced leaching method for neutral in-situ leaching uranium mine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860289A (en) * 1972-10-26 1975-01-14 United States Steel Corp Process for leaching mineral values from underground formations in situ
CN106507865B (en) * 2009-12-30 2012-10-17 核工业北京化工冶金研究院 Add O2 in-situ leaching uranium techniques in heavy carbonic root type subsoil water
CN106507867B (en) * 2011-07-13 2014-01-08 核工业北京化工冶金研究院 Soak and leach liquid processing method in Bicarbonatetypegroundwater plus CO2 and O2 ground
CN109576511A (en) * 2018-12-05 2019-04-05 核工业北京化工冶金研究院 A kind of In Pregnant Solution From In-situ Leaching method for removing iron

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860289A (en) * 1972-10-26 1975-01-14 United States Steel Corp Process for leaching mineral values from underground formations in situ
CN106507865B (en) * 2009-12-30 2012-10-17 核工业北京化工冶金研究院 Add O2 in-situ leaching uranium techniques in heavy carbonic root type subsoil water
CN106507867B (en) * 2011-07-13 2014-01-08 核工业北京化工冶金研究院 Soak and leach liquid processing method in Bicarbonatetypegroundwater plus CO2 and O2 ground
CN109576511A (en) * 2018-12-05 2019-04-05 核工业北京化工冶金研究院 A kind of In Pregnant Solution From In-situ Leaching method for removing iron

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
邓锦勋等: "不同氧化剂在酸法地浸铀矿山难浸出矿石中的应用研究", 《中国矿业》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111455173A (en) * 2020-04-24 2020-07-28 核工业北京化工冶金研究院 In-situ leaching uranium mining method for sandstone-type uranium deposit
CN115612869A (en) * 2022-09-27 2023-01-17 核工业北京化工冶金研究院 Secondary enhanced leaching method for neutral in-situ leaching uranium mine
CN115612869B (en) * 2022-09-27 2024-02-13 核工业北京化工冶金研究院 Neutral in-situ uranium ore mountain secondary intensified leaching method

Similar Documents

Publication Publication Date Title
CN110777272A (en) Use method of organic chlorine oxidant in neutral in-situ leaching uranium mining
CN110684907B (en) In-situ leaching uranium extraction leaching method for high-mineralization-degree underground water uranium ore
CN106640023B (en) A kind of coal seam with gas anti-reflection method of carbon dioxide explosion and acidifying synergy
CN102250603A (en) Separated injection oil well composite blocking remover and injection method thereof
CN111101005A (en) Supercritical CO2In-situ leaching uranium mining method by fluid synergistic organisms
CN106507865B (en) Add O2 in-situ leaching uranium techniques in heavy carbonic root type subsoil water
CN110241809A (en) A kind of microorganism reinforces the curing agent and its reinforcement means of cohesiveless soil
CN104481475B (en) Oil well carbon dioxide carbonated water is handled up method for increasing
CN102977868A (en) Hole sealing material for gas and blast drilling underground coal mine
CN104110023A (en) Device for processing lead pollution foundation by carbonization acceleration and operating method
CN104343428A (en) Verification method for scale on stratum of water injection well
CN115612869B (en) Neutral in-situ uranium ore mountain secondary intensified leaching method
CN110669950A (en) Enhanced leaching method for in-situ leaching uranium mining
CN112853127B (en) Use method of organic chlorine oxidant in acid leaching uranium mining
CN104789200A (en) Blockage removal agent for barite pollution of oil-gas well
CN111456802A (en) Highway tunnel coal seam coal uncovering outburst prevention construction method
CN111075496B (en) Device for comprehensively eliminating and suppressing outburst and dust of coal bed by injecting flue gas absorption liquid at low pressure and outburst-eliminating and dust-suppressing method
CN111455173A (en) In-situ leaching uranium mining method for sandstone-type uranium deposit
CN104060586B (en) A kind of reservoir conveyance tunnel lined steel pipe watertight grouting method
CN103437800A (en) Gas instant eliminating liquid preparing method and use method
CN102797446B (en) Steam flooding Injection Well suppresses oil reservoir to generate the method and apparatus of hydrogen sulfide
CN110714131B (en) Air pre-oxidation method for in-situ leaching uranium mining
CN113004000A (en) Polymer type double-liquid grouting material suitable for quick leakage stoppage of underground engineering, preparation method and use method
CN103437806A (en) Preparation method and using method of coal mine gas dissolving agent
CN115506768B (en) Sandstone type uranium ore supercritical CO2Fracturing-in-situ leaching mining and CO2Sealing and storing integrated method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination