CN102154561A - Non-cyanide gold leaching method for refractory gold concentrate - Google Patents
Non-cyanide gold leaching method for refractory gold concentrate Download PDFInfo
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- CN102154561A CN102154561A CN2011101327426A CN201110132742A CN102154561A CN 102154561 A CN102154561 A CN 102154561A CN 2011101327426 A CN2011101327426 A CN 2011101327426A CN 201110132742 A CN201110132742 A CN 201110132742A CN 102154561 A CN102154561 A CN 102154561A
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Abstract
The invention discloses a non-cyanide gold leaching method for refractory gold concentrate, which comprises the following steps: grinding gold concentrate to gold concentrate with grain of 0.074mm and mass content of 100%; regulating the mass concentration of an ore pulp solid to be 10-30%, and feeding the ore pulp solid into a reactor; adding nitric acid or nitrate as a catalyst into the reactor; using chloride as a complexing agent of gold; introducing oxygen to oxidize sulfide minerals and carbon materials; and simultaneously leaching the gold. When the gold leaching is carried out to the refractory gold concentrate by the method disclosed by the invention, the gold leaching rate can reach over 90%. The method disclosed by the invention has short process flow, does not use cyanide, and is beneficial to environmental-protection.
Description
Technical field
The present invention relates to a kind of gold Wet-process metallurgy method, particularly a kind of no cyanogen of refractory gold concentrate soaks golden method.
Background technology
The method of leaching gold with prussiate from contain the gold mineral raw material is called cyanide process.Cyanide process is the main method that countries in the world gold mine and Metallurgical Factory leach gold.But, the fatal shortcoming of cyanide process is the hypertoxicity of prussiate, under the situation that environmental protection standard improves day by day and the environmental protection management is strengthened day by day, the environment protection treating expense that cyanide process is produced gold also rises synchronously, and disapproves the new project of producing with cyanide process in the high area of environmental requirement.
Most of gold is distributed among the sulfide mineral with fine dip-dye form in the general refractory gold concentrate, directly adopts the gold leaching rate of cyanide process very low, in order to improve gold leaching rate, need carry out pre-treatment to gold ore, and then adopt cyanide process to leach gold.
The pretreatment process of general refractory gold concentrate has roasting oxidation method, bacterial oxidation method, reactor oxidation style, chemical oxidization method.The carbonaceous refractory gold concentrate is the refractory gold concentrate that contains the carbonate minerals composition of adsorption activity, and carbonate minerals comprises organism carbon and unformed simple substance carbon, and this carbonaceousfuel component leaches gold to cyanide process and produces serious the interference.For the pre-treatment work of carbonaceous refractory gold concentrate, not only want the oxygenolysis sulfide mineral, also to solve the interference problem of carbonate minerals.
In a word, at present refractory gold concentrate is soak gold with cyanide process again, so technical process to be long, and must to resolve the problem of environmental pollution of prussiate after the pre-treatment with carrying out someway earlier, is necessary to study without cyanide process and soaks golden novel method.
Summary of the invention
The present invention soaks golden problem of environmental pollution for the problem of soaking the gold difficulty and the cyanide process that solve refractory gold concentrate, and the no cyanogen that a kind of refractory gold concentrate is provided soaks golden method, this method with oxygen as oxygenant, nitric acid or nitrate are as catalyzer, and with the complexing agent of muriate as gold, not only oxygenolysis sulfide mineral and carbonaceous also just can reach the purpose that leaches gold without prussiate.
The present invention's method may further comprise the steps in regular turn:
(1), gold ore is levigate to-0.074mm grade gold ore mass content 100%, adjusting the pulp solids mass concentration is that 10-30% feeds in the reactor;
(2), feed nitric acid or nitrate in the reactor as catalyzer, with the complexing agent of muriate as gold, aerating oxygen oxidation of sulfureted mineral and carbonaceous thing, and leach gold simultaneously;
Described nitrate is a kind of in SODIUMNITRATE, saltpetre, nitrocalcite, magnesium nitrate and the ammonium nitrate or its two kinds combinations or its three kinds combinations or its four kinds combinations or its five kinds of combinations;
Described muriate is a kind of in sodium-chlor, Repone K, calcium chloride, magnesium chloride and the ammonium chloride or its two kinds combinations or its three kinds combinations or its four kinds combinations or its five kinds of combinations;
Operational condition is different because of the difference of gold ore composition and ore character, in general the operational condition variation range is, nitric acid or nitrate consumption are the 0.4-0.8mol/L ore pulp, muriate consumption 0.2-2.0mol/L ore pulp, slurry temperature 200-250 ℃, stagnation pressure 3.2-5.2MPa in the still, ore pulp is residence time 120-300min in still.
Nitric acid or nitrate are as the chemical reaction of catalyzer
Sulfide mineral oxygenolysis result produces sulfuric acid and vitriol in the gold ore, makes ore pulp solution be acid, is example with the main pyritous oxidizing reaction of sulfide mineral in the gold ore
4FeS
2+15O
2+2H
2O＝2Fe
2(SO
4)
3+2H
2SO
4
Nitrate is converted into nitric acid in sulphuric acid soln
2NaNO
3+H
2SO
4＝2HNO
3+Na
2SO
4
Carbonaceous is by nitric acid oxidation
C+HNO
3＝CO
2+NO+H
+
Easy and the oxygen reaction of NO
2NO+O
2＝2NO
2
NO
2Water-soluble and generate nitric acid
3NO
2+H
2O＝2HNO
3+NO
The nitric acid that is generated reacts with carbonaceous again, and the NO that produces reoxidizes and generate nitric acid.What consume in this working cycle is oxygen, and nitric acid does not consume because of reacting back regeneration.In the carbonaceous oxidising process, the carbonaceous electronics is delivered to the Sauerstoffatom of oxygen through the nitrogen-atoms of peroxy-nitric acid, so oxygen is oxygenant, and nitric acid is catalyzer.
Muriatic chlorion and golden complex reaction
Au+4Cl
-+HNO
3+H
2O＝AuCl
4 -+NO+3OH
-
Description of drawings
Fig. 1 is a schema of the present invention.
Embodiment
Embodiment 1: cooperate shown in Figure 1:
The carbonaceous refractory gold concentrate contains amorphous simple substance carbon 0.94%, organism carbon 0.81%, sulphur 15.70%, arsenic 0.94%, iron 16.46% in golden 35.19g/t, the carbonaceous.Sulfide mineral is mainly pyrite, secondly is mispickel that the method for embodiment 1 may further comprise the steps in regular turn:
(1), levigate with ball mill to-0.074mm grade mass content 100%, adjust pulp solids mass concentration 10-30%, feed in the reactor;
(2) feed nitric acid or nitrate in the reactor as catalyzer, feed the complexing agent of muriate as gold, and aerating oxygen oxidation of sulfureted mineral and carbonaceous thing;
Operational condition is that nitric acid or nitrate consumption are the 0.4-0.8mol/L ore pulp, and the muriate consumption is the 0.2-2.0mol/L ore pulp, slurry temperature 200-250 ℃, and stagnation pressure 3.2-5.2MPa in the still, ore pulp residence time 120-300min;
(3), from reactor, take out ore pulp, pour out supernatant liquor after staticly settling, add in the ore deposit that sinks to the bottom and staticly settle and pour out supernatant liquor after water stirs, it is 3-6 that amount of water is controlled at liquid-solid mass ratio, so washing is 3-5 time, and to pouring out supernatant liquor pH value greater than till 6, breeze is dried post analysis and contained gold grade.Through test of many times as a result gold leaching rate reach more than 90%.
The simultaneous test of embodiment 1:
With the carbonaceous refractory gold concentrate that adopts among the embodiment 1, and employing and embodiment 1 identical job order, operational condition is operation as different from Example 1, does not promptly feed muriate in step (2), and remaining operational condition and embodiment 1 are identical.Through multiple comparison test as a result gold leaching rate all be lower than 30%, hence one can see that, feeds the no cyanogen that muriate can significantly improve refractory gold concentrate and soak golden effect.
Embodiment 2:
The carbonaceous refractory gold concentrate contains amorphous simple substance carbon 0.98%, organism carbon 0.78%, sulphur 16.22%, arsenic 0.80%, iron 15.91% in golden 24.98g/t, the carbonaceous.Sulfide mineral is mainly pyrite, next is mispickel; The method of embodiment 1 may further comprise the steps in regular turn:
(1), levigate with ball mill to-0.074mm grade mass content 100%, adjust pulp solids mass concentration 25%, feed in the reactor;
(2) feed nitric acid in the reactor as catalyzer, feed the complexing agent of sodium-chlor as gold, and aerating oxygen carries out oxidation and soaks gold, operational condition is that nitric acid dosage is the 0.4-0.8mol/L ore pulp, the muriate consumption is the 0.2-2.0mol/L ore pulp, slurry temperature 200-240 ℃, stagnation pressure 3.5-4.5MPa in the still, ore pulp residence time 120-240min;
(3), from reactor, take out ore pulp, pour out supernatant liquor after staticly settling, add in the ore deposit that sinks to the bottom and staticly settle and pour out supernatant liquor after water stirs, it is 3-6 that amount of water is controlled at liquid-solid mass ratio, so washs 3-5 time, to pouring out supernatant liquor pH value greater than till 6.Breeze oven dry post analysis contains gold grade.Through test of many times as a result gold leaching rate all reach more than 90%.
Embodiment 3:
The carbonaceous refractory gold concentrate contains amorphous simple substance carbon 1.33%, organism carbon 1.02%, sulphur 17.56%, arsenic 0.90%, iron 18.09% in golden 37.25g/t, the carbonaceous.Sulfide mineral is mainly pyrite, next is mispickel.The method of embodiment 1 may further comprise the steps in regular turn:
(1), levigate with ball mill to-0.074mm granularity solid masses content 100%, adjust pulp solids mass concentration 25%, feed in the reactor;
(2), feed nitric acid in the reactor as catalyzer, feed the complexing agent of muriate as gold, and aerating oxygen oxidation of sulfureted mineral and carbonaceous thing, operational condition is that nitric acid dosage is the 0.45-0.8mol/L ore pulp, the muriate consumption is the 0.2-2.0mol/L ore pulp, slurry temperature 200-240 ℃, stagnation pressure 3.6-5.0MPa in the still, ore pulp residence time 120-240min;
(3) take out ore pulp from reactor, pour out supernatant liquor after staticly settling, add in the ore deposit that sinks to the bottom and staticly settle and pour out supernatant liquor after water stirs, it is 3-6 that amount of water is controlled at liquid-solid mass ratio, so washs 3-5 time, to pouring out supernatant liquor pH value greater than till 6.Breeze oven dry post analysis contains gold grade.Through test of many times as a result gold leaching rate all reach more than 90%.
Nitrate described in the embodiment 1 is a kind of in SODIUMNITRATE, saltpetre, nitrocalcite, magnesium nitrate and the ammonium nitrate or its two kinds combinations or its three kinds combinations or its four kinds combinations or its five kinds of combinations;
Muriate described in embodiment 1 and the embodiment 3 is a kind of in sodium-chlor, Repone K, calcium chloride, magnesium chloride and the ammonium chloride or its two kinds combinations or its three kinds combinations or its four kinds combinations or its five kinds of combinations.
Claims (3)
1. the no cyanogen of a refractory gold concentrate soaks golden method, and this method is:
Gold ore is levigate to-0.074mm grade mass content 100%, and adjusting the pulp solids mass concentration is that 10-30% feeds in the reactor;
In reactor with nitric acid or nitrate as catalyzer, aerating oxygen oxygenolysis sulfide mineral and carbonate minerals, and with the complexing agent of muriate as gold, carry out the leaching of gold, described nitric acid or nitrate consumption are the 0.4-0.8mol/L ore pulps, muriate consumption 0.2-2.0mol/L ore pulp, slurry temperature 200-250 ℃, stagnation pressure 3.2-5.2MPa in the still, ore pulp is residence time 120-300min in still.
2. the no cyanogen of a kind of refractory gold concentrate according to claim 1 soaks golden method, it is characterized in that: described nitrate is a kind of in SODIUMNITRATE, saltpetre, nitrocalcite, magnesium nitrate and the ammonium nitrate or its two kinds combinations or its three kinds combinations or its four kinds combinations or its five kinds of combinations.
3. the no cyanogen of a kind of refractory gold concentrate according to claim 1 soaks golden method, it is characterized in that: described muriate is a kind of in sodium-chlor, Repone K, calcium chloride, magnesium chloride and the ammonium chloride or its two kinds combinations or its three kinds combinations or its four kinds combinations or its five kinds of combinations.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104372178A (en) * | 2014-07-14 | 2015-02-25 | 刘书志 | Composite gold-leaching agent and preparation method thereof |
| CN106086451A (en) * | 2016-07-27 | 2016-11-09 | 长春黄金研究院 | A kind of method of collaborative reduction thiosulfate consumption |
| CN108193049A (en) * | 2017-11-29 | 2018-06-22 | 贵州省地质矿产中心实验室 | Method for chemical pre-oxidation synchronous cyanide-free leaching of primary gold ore |
| CN110669939A (en) * | 2019-11-12 | 2020-01-10 | 长春黄金研究院有限公司 | Method for recovering gold from wafer waste |
| CN114540634A (en) * | 2022-01-21 | 2022-05-27 | 浙江大学 | Method for extracting noble metal elements from high-concentration salt solution |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU4719000A (en) * | 1999-07-13 | 2001-01-18 | James Hamilton Kyle | Process for dissolving precious metals |
-
2011
- 2011-05-23 CN CN2011101327426A patent/CN102154561A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU4719000A (en) * | 1999-07-13 | 2001-01-18 | James Hamilton Kyle | Process for dissolving precious metals |
Non-Patent Citations (2)
| Title |
|---|
| 《矿产综合利用》 20031231 陈玉明 等 "金精矿常压稀硝酸自循环氧化浸金工艺研究" 第7-10页 1-3 , 第6期 * |
| 《黄金生产工艺指南》 20000131 《黄金生产工艺指南》编委会 稀硝酸/氯化钠氧化浸出金 地质出版社 424-426 1-3 , * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104372178A (en) * | 2014-07-14 | 2015-02-25 | 刘书志 | Composite gold-leaching agent and preparation method thereof |
| CN106086451A (en) * | 2016-07-27 | 2016-11-09 | 长春黄金研究院 | A kind of method of collaborative reduction thiosulfate consumption |
| CN108193049A (en) * | 2017-11-29 | 2018-06-22 | 贵州省地质矿产中心实验室 | Method for chemical pre-oxidation synchronous cyanide-free leaching of primary gold ore |
| CN110669939A (en) * | 2019-11-12 | 2020-01-10 | 长春黄金研究院有限公司 | Method for recovering gold from wafer waste |
| CN114540634A (en) * | 2022-01-21 | 2022-05-27 | 浙江大学 | Method for extracting noble metal elements from high-concentration salt solution |
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Application publication date: 20110817 |