CN101570829A - Gold extraction method for aqua regia in no need of nitrate removal - Google Patents
Gold extraction method for aqua regia in no need of nitrate removal Download PDFInfo
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- CN101570829A CN101570829A CNA2009100596038A CN200910059603A CN101570829A CN 101570829 A CN101570829 A CN 101570829A CN A2009100596038 A CNA2009100596038 A CN A2009100596038A CN 200910059603 A CN200910059603 A CN 200910059603A CN 101570829 A CN101570829 A CN 101570829A
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- gold
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- extracting method
- nitre
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Abstract
The invention relates to the field of gold silver smelting technique, more particularly to a gold extraction method for aqua regia in no need of nitrate removal. The inventive gold extraction method comprises the following steps of: 1) adding NaOH solution having more than 30% of concentration or solid NaOH slowly into the gold-containing aqua regia under room temperature while agitating, and stopping the addition until brown precipitates are present in aqua regia solution; (2) then reducing the solution directly with a reducing agent to sponge gold, filtering, washing, drying and casting the sponge gold into gold ingot. The invention has the following advantageous effects that: the inventive method has good working conditions, excellent environment, no generation of oxides of toxic brown nitrogen and good benefit for physical and metal health of operators, can be implemented with or without ventilation facilities, is different from nitrate removal that requires ventilation facilities, and is simple in operation, easy in control and free from the situation of difficult nitrate removal; the gold-containing aqua regia is reduced at pH of 5.0-5.2, after the reduction, the reduced solution is detected by means of atomic absorption until no gold is detected. The produced finished gold has high gold grade (which is not less than 99.9% in general).
Description
Technical field
The present invention relates to the silver smelting technical field, specifically relate to the gold extracting method that a kind of chloroazotic acid need not caught up with nitre.
Background technology
The extraction of king's underwater gold, prior art are that hydrochloric acid catches up with nitre or urea to catch up with nitre.It is will contain golden chloroazotic acid to be heated to 80～100 ℃ that hydrochloric acid is caught up with nitre, divides to add hydrochloric acid for 3～4 times, and the limit adds the hydrochloric acid limit stirs, and does not have when adding hydrochloric acid that tobacco is emerged and show thickness slightly, removes NO in the chloroazotic acid with this
3 -It is to add urea 85 ℃ of temperature toward containing in the golden chloroazotic acid that urea is caught up with nitre, adding speed from slow to fast, the limit adds the urea limit stirs, and does not have tobacco and emerge when adding urea, add urea after, 90 ℃ of controlled temperature reacted 0.5～1 hour.Catch up with behind the nitre liquid with reductive agent such as Na
2SO
3, NaHSO
4, SO
2, FeCl
2, Na
2S
2O
3, Na
2S
2O
5, H
2C
2O
4Deng being reduced into cake of gold, filtration, washing, oven dry, founding become ingot.Chloroazotic acid catches up with nitre to consume hydrochloric acid, urea amount is big, and labor condition is abominable, and environment is relatively poor, trivial operations, and the finished product gold grade of output not high (generally 99～99.9%).
It is difficult to catch up with nitre to reach terminal point, and particularly hydrochloric acid is caught up with nitre, catches up with nitre not thorough, easily causes Jin Fanrong.
It is slow that urea catches up with nitre requirement urea to add fashionable commencing speed, after from slow to fast, the limit adds the urea limit stirs, otherwise a large amount of gases that produce can cause material excessive.
Summary of the invention
The technical problem to be solved in the present invention is at the deficiencies in the prior art, provides a kind of chloroazotic acid need not catch up with the gold extracting method of nitre.
A kind of chloroazotic acid of the present invention need not catch up with the gold extracting method of nitre to be achieved by following technical proposals: a kind of chloroazotic acid of the present invention need not catch up with the gold extracting method reaction of nitre to be simple acid-base neutralisation reaction, and promptly the pH with NaOH adjustment chloroazotic acid is 5.0～5.2.
H
++OH
-＝H
2O
Described gold extracting method comprises the steps:
1) will contain golden chloroazotic acid and at room temperature slowly add concentration greater than 30% NaOH solution or solid NaOH, and stir while adding, brown precipitate just having occurred to wang aqueous solution is terminal point, this moment pH value of solution 5.0～5.2;
2) be available reductive agent such as Na then
2SO
3, NaHSO
4, SO
2, FeCl
2, Na
2S
2O
3, Na
2S
2O
5, H
2C
2O
4Be reduced into cake of gold Deng directly, filtration, washing, oven dry, founding become ingot.
A kind of chloroazotic acid of the present invention need not catch up with the gold extracting method of nitre that following beneficial effect is arranged compared with prior art: the inventive method labor condition is good, environment is good, not having deleterious brown nitrogen oxide produces, the physical and mental health that is of value to the operator, have or not ventilation equipment all can, be different from and catch up with nitre to need ventilation equipment.
Simple to operate, be easy to control.Do not exist and catch up with the nitre situation of difficult, contain time reduction in pH5.0～5.2 of golden chloroazotic acid, reduction back liquid detects with atomic absorption, and gold can't check.
The finished product gold grade height of output (general 〉=99.9%).
Embodiment
Need not catch up with the gold extracting method technical scheme of nitre to be further described below in conjunction with embodiment to a kind of chloroazotic acid of the present invention.
A kind of chloroazotic acid of the present invention need not catch up with the gold extracting method reaction of nitre to be simple acid-base neutralisation reaction, and promptly the pH with NaOH adjustment chloroazotic acid is 5.0～5.2;
H
++OH
-＝H
2O
Described gold extracting method comprises the steps:
1) will contain golden chloroazotic acid and at room temperature slowly add concentration greater than 30% NaOH solution or solid NaOH, and stir while adding, brown precipitate just having occurred to wang aqueous solution is terminal point, this moment pH value of solution 5.0～5.2;
2) be available reductive agent such as Na then
2SO
3, NaHSO
4, SO
2, FeCl
2, Na
2S
2O
3, Na
2S
2O
5, H
2C
2O
4Be reduced into cake of gold Deng directly, filtration, washing, oven dry, founding become ingot.
Described adding NaOH solution or solid NaOH requirement slowly add, because of reacting violent after adding and producing a large amount of heat.
Described pH value of solution 5.0～5.2 usefulness accurate pH test papers or pH meter detect.
Embodiment 1.
The reaction that present embodiment takes place is simple acid-base neutralisation reaction, and promptly the pH with NaOH adjustment chloroazotic acid is 5.0～5.2.
H
++OH
-＝H
2O
To contain golden chloroazotic acid at room temperature slowly adds concentration and (notes: 1., require slowly to add, violent and produce a large amount of heat because of reaction after adding greater than 30% NaOH solution or solid NaOH; 2., the NaOH strength of solution is low, easily causes volumetric expansion), stir while adding, brown precipitate just having occurred to wang aqueous solution is terminal point, pH value of solution 5.0～5.2 this moment (detecting with accurate pH test paper or pH meter).Be available reductive agent such as Na then
2SO
3, NaHSO
4, SO
2, FeCl
2, Na
2S
2O
3, Na
2S
2O
5, H
2C
2O
4Be reduced into cake of gold Deng directly, filtration, washing, oven dry, founding become ingot.
Claims (3)
1, a kind of chloroazotic acid need not caught up with the gold extracting method of nitre, it is characterized in that: described gold extracting method reaction is simple acid-base neutralisation reaction, and promptly the pH with NaOH adjustment chloroazotic acid is 5.0～5.2;
H
++OH
-＝H
2O
Described gold extracting method comprises the steps:
1) will contain golden chloroazotic acid and at room temperature slowly add concentration greater than 30% NaOH solution or solid NaOH, and stir while adding, brown precipitate just having occurred to wang aqueous solution is terminal point, this moment pH value of solution 5.0～5.2;
2) be available reductive agent such as Na then
2SO
3, NaHSO
4, SO
2, FeCl
2, Na
2S
2O
3, Na
2S
2O
5, H
2C
2O
4Be reduced into cake of gold Deng directly, filtration, washing, oven dry, founding become ingot.
2, chloroazotic acid according to claim 1 need not caught up with the gold extracting method of nitre, it is characterized in that: described adding NaOH solution or solid NaOH requirement slowly add, because of reacting violent after adding and producing a large amount of heat.
3, chloroazotic acid according to claim 1 need not caught up with the gold extracting method of nitre, it is characterized in that: described pH value of solution 5.0～5.2 usefulness accurate pH test papers or pH meter detect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100596038A CN101570829A (en) | 2009-06-10 | 2009-06-10 | Gold extraction method for aqua regia in no need of nitrate removal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100596038A CN101570829A (en) | 2009-06-10 | 2009-06-10 | Gold extraction method for aqua regia in no need of nitrate removal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101570829A true CN101570829A (en) | 2009-11-04 |
Family
ID=41230312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100596038A Pending CN101570829A (en) | 2009-06-10 | 2009-06-10 | Gold extraction method for aqua regia in no need of nitrate removal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101570829A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517452A (en) * | 2011-12-09 | 2012-06-27 | 紫金矿业集团股份有限公司 | Method for recovering gold from gold-containing tail liquid produced by gold-loaded carbon desorption and electrodeposition technology |
| CN102690950A (en) * | 2012-06-15 | 2012-09-26 | 紫金矿业集团股份有限公司 | Method for recycling gold from low-grade gold-containing tail liquid generated from gold-carrying carbon desorption-electrodeposition technology |
| CN105154685A (en) * | 2015-06-04 | 2015-12-16 | 昆山鸿福泰环保科技有限公司 | Technology for recovering gold by potentiometer control method |
-
2009
- 2009-06-10 CN CNA2009100596038A patent/CN101570829A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517452A (en) * | 2011-12-09 | 2012-06-27 | 紫金矿业集团股份有限公司 | Method for recovering gold from gold-containing tail liquid produced by gold-loaded carbon desorption and electrodeposition technology |
| CN102690950A (en) * | 2012-06-15 | 2012-09-26 | 紫金矿业集团股份有限公司 | Method for recycling gold from low-grade gold-containing tail liquid generated from gold-carrying carbon desorption-electrodeposition technology |
| CN105154685A (en) * | 2015-06-04 | 2015-12-16 | 昆山鸿福泰环保科技有限公司 | Technology for recovering gold by potentiometer control method |
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Open date: 20091104 |