CN105838900B - One kind uses I2The method that gold refining is carried out with NaI - Google Patents
One kind uses I2The method that gold refining is carried out with NaI Download PDFInfo
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- CN105838900B CN105838900B CN201610221644.2A CN201610221644A CN105838900B CN 105838900 B CN105838900 B CN 105838900B CN 201610221644 A CN201610221644 A CN 201610221644A CN 105838900 B CN105838900 B CN 105838900B
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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
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/20—Electrolytic production, recovery or refining of metals by electrolysis of solutions of noble metals
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to metal smelt technical field, and in particular to one kind uses I2The method that gold refining is carried out with NaI.The step of methods described is：The reduction electrolysis of powder by atomization dissolution filter.The method of the invention does not produce waste gas waste water, and refining cycle is only 35 hours, only need to use electric energy, security risk is low, and the purity for obtaining gold can reach 99.995%；The high target of environment-friendly, economical rationality, technical feasibility, safe operation, product quality is truly realized, is the optimal selection for realizing pollution-free gold metallurgy.
Description
Technical field
The invention belongs to metal smelt technical field, and in particular to one kind uses I2The method that gold refining is carried out with NaI.
Background technology
For most of gold manufacturing enterprises, the gold product purity of traditional smelting process production can not be met
It is required that.In order to adapt to the change in market as early as possible, more economic benefits are created, enterprise is just actively fermenting carries out skill to smelting process
Art updates, and using advanced gold refining techniques, promotes the product up-gradation of enterprise.Therefore, the research of gold refining techniques and open
Hair application is increasingly paid attention to by gold manufacturing enterprises.
Being presently used for the method for gold refining mainly has chloroazotic acid method, chloridising (Boliden techniques), extraction, electrolysis
Four kinds.Wherein, chloroazotic acid method, extraction have the shortcomings that similar：Exhausted air quantity is big, and intractability is high；Wastewater flow rate is larger, HCl concentration
Height, processing cost is high；During using chloridising, waste gas, waste water yield are big, and processing cost is high, and equipment investment is big, and contains in raw material
There is chlorine, there is larger potential safety hazard；The waste water and gas yield of electrolysis is small, and processing cost is low, but gold overstock compared with
Many, refining cycle is long, and production cost is higher.Table 1 is the comparison figure of four kinds of gold method of refining.
The comparison sheet of 1 four kinds of gold method of refining of table
As can be seen from the above table, these four gold method of refining are respectively provided with certain limitation, hinder them in industry
On further application, therefore, also urgently need a kind of new gold method of refining of development.
The content of the invention
I is used the invention provides one kind2The method that gold refining is carried out with NaI, concrete technical scheme is as follows：
One kind uses I2The method that gold refining is carried out with NaI, is concretely comprised the following steps：
(1) powder by atomization：Using hydraulic atomized powder manufacturing apparatus, thick gold is melted, and be atomized, coagulated using High-Pressure Water
Gu, obtain bronze；
(2) dissolve：The bronze that step (1) is obtained is added in the reactor equipped with elemental iodine and NaI, adds ion exchange
Water, leaching is completely dissolved bronze, obtains NaAuI4Solution；Reaction equation is：2Au+3I2+ 2NaI=2NaAuI4；
(3) filter：Solution is adjusted to pH=8.5-9.0, insoluble AgI and other metal impurities is filtered to remove, filter residue is sent
Enter silver recovery system；
(4) reduce：NaAuI is reduced with catholyte4Solution, washs after drying through deionized water, obtains proof gold powder；Reaction equation
For：2NaAuI4+ 6NaOH=2Au+7NaI+NaIO3+3H2O；
(5) it is electrolysed：The micro NaAuI not reduced by catholyte4Negative electrode is deposited on silver, platinum, palladium, step (4) generation
NaI solution is electrolysed into iodine generator, and cathodic region obtains NaOH and NaI mixed solution, and anode region obtains iodine and NaI
Mixed solution；NaOH and NaI is used for step (4) and reduces process, and iodine and NaI are used for step (2) dissolution process；Reaction equation is：
Anode 2NaI=I2+2Na++2e
Negative electrode NaIO3+3H2O+6e=NaI+6OH-
Na++OH-=NaOH.
Step (1) obtains the mesh of the particle diameter of bronze≤60.
In step (1), the model JTSWH-30 of hydraulic atomized powder manufacturing apparatus, the time is 40-60min.
In step (2), the ratio between bronze, elemental iodine, consumption of NaI and ion exchange water are 1kg：2kg：3.1kg：(6-
10L)。
In step (2), reaction temperature is 40-55 DEG C, and speed of agitator is 120r/min, and extraction time is 80-120min.
In step (3), with 1.0 × 10-2M sodium hydroxide solution adjusts the pH value of solution.
The composition of step (4) described catholyte includes NaOH and NaI, concentration >=3M of the NaOH, the NaOH with it is thick
The quality of gold is (620-730g)：1000g.
The percent reduction of step (4) reduction is 98.5-99.6%.
In step (5), electrolytic condition is：Tank voltage 3.8-4.3V, current density 150-230A/m2, step (4) generation
The concentration of NaI solution is 500-800g/L.
Fineness of gold >=99.995% obtained using the above method.
Beneficial effects of the present invention are：The present invention avoids using strong acid and severe poisonous chemicals, refining in gold refining process
Golden raw material I2With NaI is renewable in system realizes automatic cycle, the NaOH of output is used to reduce gold, once puts into, no
Chemical reagent must be added again；And I2It is the important source material of medicine food industry with NaI.The method of the invention does not produce waste gas and given up
Water, refining cycle is only 3-5 hours, only need to use electric energy, security risk is low, and the purity for obtaining gold can reach 99.995%.
The gold method of refining is truly realized the high target of environment-friendly, economical rationality, technical feasibility, easy to operate, product quality,
It is the optimal selection for realizing pollution-free gold metallurgy.
Figure of description
Fig. 1 is the purity detecting report for the gold that embodiment 1 is prepared.
Embodiment
With reference to specific embodiment, the present invention is described further, but not thereby limiting the invention required
The scope of protection.
Embodiment 1
(1) powder by atomization：Using model JTSWH-30 hydraulic atomized powder manufacturing apparatus, melt thick gold, and profit
It is atomized, solidified with High-Pressure Water, the time is 40-60min, obtains the bronze of the mesh of particle diameter≤60.
(2) dissolve：The bronze that step (1) is obtained is added in the reactor equipped with elemental iodine and NaI, adds ion exchange
Water, leaching is completely dissolved bronze, obtains NaAuI4Solution；Reaction equation is：2Au+3I2+ 2NaI=2NaAuI4；Wherein,
The ratio between bronze, elemental iodine, consumption of NaI and ion exchange water are 1kg：2kg：3.1kg：(6-10L)；Reaction temperature is 40-55
DEG C, speed of agitator is 120r/min, and extraction time is 80-120min.
(3) filter：With 1.0 × 10-2The pH value of M sodium hydroxide solution regulation solution is filtered to remove insoluble to 8.5-9.0
AgI and other metal impurities, filter residue feeding silver recovery system；
(4) reduce：NaAuI is reduced with catholyte4Solution, washs after drying through deionized water, obtains proof gold powder, percent reduction
For 98.5-99.6%；Reaction equation is：2NaAuI4+ 6NaOH=2Au+7NaI+NaIO3+3H2O；The composition of the catholyte includes
The quality of NaOH and NaI, the NaOH concentration >=3M, the NaOH and thick gold is (620-730g)：1000g.
(5) it is electrolysed：The micro NaAuI not reduced by catholyte4Negative electrode is deposited on silver, platinum, palladium, step (4) generation
NaI solution (concentration is 500-800g/L) is electrolysed into iodine generator, and electrolytic condition is：Tank voltage 3.8-4.3V, electric current
Density 150-230A/m2；Cathodic region obtains NaOH and NaI mixed solution, and anode region obtains iodine and NaI mixed solution；
NaOH and NaI is used for step (4) and reduces process, and iodine and NaI are used for step (2) dissolution process；Reaction equation is：
Anode 2NaI=I2+2Na++2e
Negative electrode NaIO3+3H2O+6e=NaI+6OH-
Na++OH-=NaOH.
Fineness of gold >=99.995% obtained using the above method, examining report is as shown in Figure 1.This report is purple by Fujian
Gold mine smelting measuring technology Co., Ltd provides, and detection project foundation is GB/T 25934.2-2010 High Purity Gold chemical analysis methods,
The content of ICP-MS- Standard entertions correction-internal mark method determination impurity element.
Claims (8)
1. one kind uses I2The method that gold refining is carried out with NaI, it is characterised in that concretely comprise the following steps：
(1) powder by atomization：Using hydraulic atomized powder manufacturing apparatus, melt thick gold, and using High-Pressure Water atomization, solidification,
Obtain bronze；
(2) dissolve：The bronze that step (1) is obtained is added in the reactor equipped with elemental iodine and NaI, adds ion exchange water,
Leaching, is completely dissolved bronze, obtains NaAuI4Solution；Reaction equation is：2Au+3I2+ 2NaI=2NaAuI4；The gold
The ratio between powder, elemental iodine, consumption of NaI and ion exchange water are 1kg：2kg：3.1kg：(6-10L)；The reaction temperature is 40-
55 DEG C, speed of agitator is 120r/min, and extraction time is 80-120min；
(3) filter：Solution is adjusted to pH=8.5-9.0, insoluble AgI and other metal impurities, filter residue feeding silver is filtered to remove
Recovery system；
(4) reduce：NaAuI is reduced with catholyte4Solution, washs after drying through deionized water, obtains proof gold powder；Reaction equation is：
2NaAuI4+ 6NaOH=2Au+7NaI+NaIO3+3H2O；
(5) it is electrolysed：The micro NaAuI not reduced by catholyte4Negative electrode is deposited on silver, platinum, palladium, the NaI of step (4) generation is molten
Liquid is electrolysed into iodine generator, and cathodic region obtains NaOH and NaI mixed solution, and anode region obtains iodine and NaI mixing
Solution；NaOH and NaI is used for step (4) and reduces process, and iodine and NaI are used for step (2) dissolution process；Reaction equation is：
Anode 2NaI=I2+2Na++2e
Negative electrode NaIO3+3H2O+6e=NaI+6OH-
Na++OH-=NaOH.
2. according to the method described in claim 1, it is characterised in that step (1) obtains the mesh of the particle diameter of bronze≤60.
3. according to the method described in claim 1, it is characterised in that in step (1), the model of hydraulic atomized powder manufacturing apparatus
JTSWH-30, the time is 40-60min.
4. according to the method described in claim 1, it is characterised in that in step (3), with 1.0 × 10-2M sodium hydroxide solution
Adjust the pH value of solution.
5. according to the method described in claim 1, it is characterised in that the composition of step (4) described catholyte include NaOH and
The quality of NaI, the NaOH concentration >=3M, the NaOH and thick gold is (620-730g)：1000g.
6. according to the method described in claim 1, it is characterised in that the percent reduction of step (4) reduction is 98.5-99.6%.
7. according to the method described in claim 1, it is characterised in that in step (5), electrolytic condition is：Tank voltage 3.8-4.3V,
Current density 150-230A/m2, the concentration of the NaI solution of step (4) generation is 500-800g/L.
8. the method according to claim any one of 1-7, it is characterised in that the gold obtained using methods described, purity
>=99.995%.
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| CN106256914B (en) * | 2016-08-29 | 2021-03-23 | 许良秋 | Bromine-sodium bromide gold refining method |
| CN107354308B (en) * | 2017-07-28 | 2019-09-24 | 许良秋 | A method of gold of purifying metals |
| CN110983065A (en) * | 2019-12-23 | 2020-04-10 | 昆山全亚冠环保科技有限公司 | Method for reducing gold in iodine-containing waste liquid |
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| KR890002443A (en) * | 1987-07-14 | 1989-04-10 | 다나까 준-이찌로 | Gold refining method and apparatus |
| CN101392325B (en) * | 2008-10-21 | 2010-08-11 | 东华大学 | Method for extracting gold from waste printed circuit board |
| CN102586617B (en) * | 2012-02-14 | 2014-02-19 | 中国航天科技集团公司第九研究院第七七一研究所 | Method for recovering gold from iodine-potassium iodide leachate |
| CN105018725B (en) * | 2015-08-07 | 2017-11-21 | 珠海格力电器股份有限公司 | Gold leaching solution and method for recovering gold |
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Effective date of registration: 20230630 Address after: No. 13 Hengshan Road, Xinluo District, Longyan City, Fujian Province, 364000 Patentee after: Longyan Huanmei New Material Technology Co.,Ltd. Address before: No. 56, Zhongyang, Yongjia Village, Chishui Town, Dehua County, Quanzhou City, Fujian Province, 362503 Patentee before: Xu Liangqiu Patentee before: Ma Xiaohong Patentee before: Zhuang Guangjun Patentee before: Lin Wenhui |