CN114622866B - In-situ leaching mine NaOH well washing process - Google Patents
In-situ leaching mine NaOH well washing process Download PDFInfo
- Publication number
- CN114622866B CN114622866B CN202011474442.1A CN202011474442A CN114622866B CN 114622866 B CN114622866 B CN 114622866B CN 202011474442 A CN202011474442 A CN 202011474442A CN 114622866 B CN114622866 B CN 114622866B
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- Prior art keywords
- naoh
- solution
- well
- hole
- well washing
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 title claims abstract description 96
- 238000005406 washing Methods 0.000 title claims abstract description 25
- 238000002386 leaching Methods 0.000 title claims abstract description 19
- 238000011065 in-situ storage Methods 0.000 title claims description 6
- 239000000243 solution Substances 0.000 claims abstract description 32
- 238000002347 injection Methods 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000005553 drilling Methods 0.000 claims abstract description 13
- 238000011010 flushing procedure Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 239000003513 alkali Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 14
- 239000008235 industrial water Substances 0.000 claims description 9
- 239000003929 acidic solution Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 abstract description 10
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 10
- 229920000642 polymer Polymers 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 229910052770 Uranium Inorganic materials 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000012670 alkaline solution Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses an on-site leaching mine NaOH well washing process, which comprises the following steps: step 1: replacing with clear water; step 2: alkali liquor feeding; step 3: soaking and dissolving; step 4: flushing the well by an air compressor; step 5: and (5) installing a pipeline, and directly recovering the liquid injection at the maximum flow. The invention has the beneficial effects that: when the NaOH well washing process is applied to the field, the change of the injection flow after well washing is seen, the test hole injection capacity is obviously improved after the well washing is carried out by the NaOH soaking, and the maintenance time is longer. From the analysis result of the well washing water, the SiO in the well washing water can be seen 2 The content is more than 10 times of that of the leaching solution, which shows that the silicic acid polymer in the drilling hole can be effectively dissolved by adding NaOH into the drilling hole, and the problem of blockage of the drilling hole by washing the well with NaOH can be solved.
Description
Technical Field
The invention belongs to the field of on-site leaching uranium mining, and particularly relates to an on-site leaching mine NaOH well washing process, which is applied to a method for rapidly improving the operation flow of a liquid pumping and injecting well and removing blockage and increasing seepage of a mineral bearing layer in an acid-process on-site leaching mine well site.
Background
The existing domestic in-situ uranium leaching mines are mostly leached by an acid method, and uranium in a mineral layer is transferred into a solution (leaching solution) through chemical reaction by continuously injecting an acid solution (leaching solution) from a liquid injection hole. Along with the circulating movement of the solution, the well site injection pressure continuously rises, and the total volume of the injection liquid in the mining area rapidly drops. After well flushing measures such as air compression and air compressors are adopted, the injection flow is not obviously improved.
Disclosure of Invention
The invention aims to provide an on-site leaching mine NaOH well washing process, which mainly aims at the condition that a mineral layer is blocked by silicic acid generated in the uranium mining process by on-site leaching by an acid method, and the method is characterized in that a silicic acid polymer blocking a drilling hole is dissolved by soaking the blocked drilling hole with NaOH, and the dissolved waste liquid is washed out, so that the liquid passing capacity is effectively improved.
The technical scheme of the invention is as follows: an in-situ leaching mine NaOH well washing process comprises the following steps:
step 1: replacing with clear water;
step 2: alkali liquor feeding;
step 3: soaking and dissolving;
step 4: flushing the well by an air compressor;
step 5: and (5) installing a pipeline, and directly recovering the liquid injection at the maximum flow.
And the step 1 is to inject a certain volume of industrial water into the well to be washed.
The specific process of the step 1 is as follows:
calculating the volume Q of a casing of a drill hole, injecting a proper amount of industrial water into the drill hole, and diluting the acidic solution in the drill hole;
Q＝HπR 2
q: borehole casing volume, H: drilling hole depth, R: bore inner diameter radius.
Step 2 is to prepare NaOH solutions with different concentrations of 0.5m each 3 And sequentially injecting the materials into the drill hole from the high concentration to the low concentration.
The step 2 is to prepare NaOH with concentration of 20-25% in turn0.5m of solution 0.5m3, 15-20% 3 10-15% solution 0.5m 3 5-10% solution 1.5m 3 And sequentially injecting into the liquid injection holes.
And step 3, after the NaOH solution is injected, injecting a certain volume of industrial water into the injection hole, and standing for 24 hours after the injection is completed.
And step 4, flushing the drilled hole by using an air compressor, and washing out impurities and sediments in the drilled hole until flushing liquid is acidic and the solution is clear.
The invention has the beneficial effects that: when the NaOH well washing process is applied to the field, the change of the injection flow after well washing is seen, the test hole injection capacity is obviously improved after the well washing is carried out by the NaOH soaking, and the maintenance time is longer. From the analysis result of the well washing water, the SiO in the well washing water can be seen 2 The content is more than 10 times of that of the leaching solution, which shows that the silicic acid polymer in the drilling hole can be effectively dissolved by adding NaOH into the drilling hole, and the problem of blockage of the drilling hole by washing the well with NaOH can be solved.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Aiming at the problems in the prior art, after analyzing the components of the injection component by assaying, judging that the reason for the decline of the injection capability is the blockage of silicic acid polymerization, the physical and chemical properties of the silicic acid are stable, the silicic acid is insoluble in water and insoluble in acid (dissolved in HF acid), and the silicic acid is heated to 150 ℃ to be decomposed into SiO 2 Can react with strong alkali. Therefore, the NaOH well washing method is provided, the silicate polymer blocking the drilling hole is dissolved by carrying out NaOH soaking on the blocking drilling hole, and the dissolved waste liquid is washed out by carrying out well washing of an air compressor in a matching way, so that the liquid passing capacity is effectively improved.
An in-situ leaching mine NaOH well washing process comprises the following steps:
step 1: clean water replacement
And injecting a certain volume of industrial water into the injection hole of the well to be washed (the original leaching solution in the injection hole is fully pressed to an ore layer, and the acidic solution is isolated from the alkaline solution to be injected, so that the content of impurities in the leaching solution is extremely high, and the main purpose of isolation is to reduce metal precipitates and prevent the injection hole from being blocked so as to keep the subsequent solution from being injected smoothly).
The specific process is as follows:
calculating the volume Q of a casing of a drill hole, injecting a proper amount of industrial water into the drill hole, and diluting the acidic solution in the drill hole;
Q＝HπR 2
q: borehole casing volume, H: drilling hole depth, R: bore inner diameter radius.
Step 2: alkali liquor feeding
Preparing NaOH solutions with different concentrations of 0.5m each 3 And sequentially injecting the materials into the drill hole from high to low in concentration, wherein the method comprises the following steps of:
sequentially preparing 0.5m3 of solution with NaOH concentration of 20-25% and 0.5m of solution with NaOH concentration of 15-20% 3 10-15% solution 0.5m 3 5-10% solution 1.5m 3 And sequentially injecting into the liquid injection holes.
Step 3: soaking and dissolving
After the NaOH solution is injected, a certain volume of industrial water is injected into the injection hole, and the alkaline solution injected in the earlier stage is pressed to the filter and the peripheral mineral layer so as to fully dissolve silicic acid polymers accumulated around the filter. After the addition was completed, it was left to stand for 24 hours. The specific process is as follows:
and (3) after the prepared NaOH solution is completely injected into the drilled hole, injecting the clean water with the same volume in the step (1) into the drilled hole, and standing for 24 hours.
Step 4: air compressor well-flushing
And (3) flushing the drilled hole by using an air compressor, and washing out impurities and sediments in the drilled hole until flushing liquid is acidic (pH is less than 2) and the solution is clear.
Step 5: and (5) installing a pipeline, and directly recovering the liquid injection at the maximum flow.
The foregoing is illustrative of an example of an application of the NaOH well flushing method to a uranium leaching site, and any equivalent and obvious modification of the well flushing method to unblock a plugged seam by dissolving the silicic acid polymer with NaOH solution is within the spirit of the present description and shall be protected by the present invention.
Claims (1)
1. An in-situ leaching mine NaOH well washing process is characterized by comprising the following steps of:
step 1: replacing with clear water;
step 2: alkali liquor feeding;
step 3: soaking and dissolving;
step 4: flushing the well by an air compressor;
step 5: installing a pipeline, and directly recovering the liquid injection at the maximum flow;
step 1 is to inject a certain volume of industrial water into a liquid injection hole of a well to be washed;
the specific process of the step 1 is as follows:
calculating the volume Q of a casing of a drill hole, injecting a proper amount of industrial water into the drill hole, and diluting the acidic solution in the drill hole;
Q＝HπR 2
q: borehole casing volume, H: drilling hole depth, R: the radius of the inner diameter of the drill hole;
step 2 is to prepare NaOH solutions with different concentrations of 0.5m each 3 Sequentially injecting the materials into the drill holes from high to low in concentration;
step 2 is to prepare 0.5m of solution with NaOH concentration of 20-25% in sequence 3 15-20% solution 0.5m 3 10-15% solution 0.5m 3 5-10% solution 1.5m 3 Sequentially injecting the liquid into the liquid injection holes;
step 3 is to inject a certain volume of industrial water into the injection hole after the NaOH solution is injected, and to stand for 24 hours after the injection is completed;
and step 4, flushing the drilled hole by using an air compressor, and washing out impurities and sediments in the drilled hole until flushing liquid is acidic and the solution is clear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011474442.1A CN114622866B (en) | 2020-12-14 | 2020-12-14 | In-situ leaching mine NaOH well washing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011474442.1A CN114622866B (en) | 2020-12-14 | 2020-12-14 | In-situ leaching mine NaOH well washing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114622866A CN114622866A (en) | 2022-06-14 |
| CN114622866B true CN114622866B (en) | 2024-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011474442.1A Active CN114622866B (en) | 2020-12-14 | 2020-12-14 | In-situ leaching mine NaOH well washing process |
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| Country | Link |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4487262A (en) * | 1982-12-22 | 1984-12-11 | Mobil Oil Corporation | Drive for heavy oil recovery |
| CN1435464A (en) * | 2002-11-08 | 2003-08-13 | 郝占元 | Borehole synthetic chlorine dioxide blocking remover and broken down method therewith for oil field |
| CN102720467A (en) * | 2012-05-18 | 2012-10-10 | 核工业北京化工冶金研究院 | Residual acid flowback method after acid method hole-flushing in-situ leach of uranium |
| CN104724849A (en) * | 2013-12-19 | 2015-06-24 | 中国科学院沈阳应用生态研究所 | Method for removal of polyacrylamide and hydrolysis product thereof from polymer flooding well washing water |
| CN106968639A (en) * | 2017-03-13 | 2017-07-21 | 中国石油化工股份有限公司 | A kind of method of hydrogen sulfide in improvement oil well |
| CN109989727A (en) * | 2017-12-29 | 2019-07-09 | 新疆中核天山铀业有限公司 | A kind of ground-dipping uranium extraction drilling de-plugging anatonosis technique |
| CN111878039A (en) * | 2020-08-03 | 2020-11-03 | 核工业北京化工冶金研究院 | Well washing method for in-situ leaching uranium mining |
-
2020
- 2020-12-14 CN CN202011474442.1A patent/CN114622866B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4487262A (en) * | 1982-12-22 | 1984-12-11 | Mobil Oil Corporation | Drive for heavy oil recovery |
| CN1435464A (en) * | 2002-11-08 | 2003-08-13 | 郝占元 | Borehole synthetic chlorine dioxide blocking remover and broken down method therewith for oil field |
| CN102720467A (en) * | 2012-05-18 | 2012-10-10 | 核工业北京化工冶金研究院 | Residual acid flowback method after acid method hole-flushing in-situ leach of uranium |
| CN104724849A (en) * | 2013-12-19 | 2015-06-24 | 中国科学院沈阳应用生态研究所 | Method for removal of polyacrylamide and hydrolysis product thereof from polymer flooding well washing water |
| CN106968639A (en) * | 2017-03-13 | 2017-07-21 | 中国石油化工股份有限公司 | A kind of method of hydrogen sulfide in improvement oil well |
| CN109989727A (en) * | 2017-12-29 | 2019-07-09 | 新疆中核天山铀业有限公司 | A kind of ground-dipping uranium extraction drilling de-plugging anatonosis technique |
| CN111878039A (en) * | 2020-08-03 | 2020-11-03 | 核工业北京化工冶金研究院 | Well washing method for in-situ leaching uranium mining |
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|---|---|
| CN114622866A (en) | 2022-06-14 |
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