CN111579338A - Method for measuring gold in secondary utilization waste - Google Patents
Method for measuring gold in secondary utilization waste Download PDFInfo
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- CN111579338A CN111579338A CN202010600177.0A CN202010600177A CN111579338A CN 111579338 A CN111579338 A CN 111579338A CN 202010600177 A CN202010600177 A CN 202010600177A CN 111579338 A CN111579338 A CN 111579338A
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- 239000002699 waste material Substances 0.000 title claims abstract description 75
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000010931 gold Substances 0.000 title claims abstract description 61
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000002386 leaching Methods 0.000 claims abstract description 59
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 33
- 239000003814 drug Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- TXUICONDJPYNPY-UHFFFAOYSA-N (1,10,13-trimethyl-3-oxo-4,5,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl) heptanoate Chemical compound C1CC2CC(=O)C=C(C)C2(C)C2C1C1CCC(OC(=O)CCCCCC)C1(C)CC2 TXUICONDJPYNPY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910021626 Tin(II) chloride Inorganic materials 0.000 claims abstract description 24
- 239000001119 stannous chloride Substances 0.000 claims abstract description 24
- 235000011150 stannous chloride Nutrition 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 239000000243 solution Substances 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000002101 nanobubble Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- VNTKRIKCFGOCSI-UHFFFAOYSA-I [Au+3].[I-].[K+].[I+].[I-].[I-].[I-].[I-] Chemical compound [Au+3].[I-].[K+].[I+].[I-].[I-].[I-].[I-] VNTKRIKCFGOCSI-UHFFFAOYSA-I 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 229910052935 jarosite Inorganic materials 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 28
- 239000003513 alkali Substances 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 230000035484 reaction time Effects 0.000 claims description 13
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 12
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 6
- 241000931705 Cicada Species 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 2
- DKNPRRRKHAEUMW-UHFFFAOYSA-N Iodine aqueous Chemical compound [K+].I[I-]I DKNPRRRKHAEUMW-UHFFFAOYSA-N 0.000 claims description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- 150000001413 amino acids Chemical class 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- 229910052740 iodine Inorganic materials 0.000 claims description 2
- 239000011630 iodine Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 18
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 5
- 239000011707 mineral Substances 0.000 abstract description 5
- 239000011259 mixed solution Substances 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- 229940071182 stannate Drugs 0.000 abstract description 2
- 125000005402 stannate group Chemical group 0.000 abstract description 2
- 239000010793 electronic waste Substances 0.000 description 6
- 239000010813 municipal solid waste Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 125000003275 alpha amino acid group Chemical group 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012822 chemical development Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- HNDVDQJCIGZPNO-UHFFFAOYSA-N histidine Natural products OC(=O)C(N)CC1=CN=CN1 HNDVDQJCIGZPNO-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for measuring gold in secondary utilization waste, belonging to the technical field of comprehensive utilization of solid waste. The method comprises the steps of preparing waste, preparing a dilute hydrochloric acid extracting agent, mixing stannous chloride and dilute hydrochloric acid to prepare a reducing agent, taking the waste and the dilute hydrochloric acid extracting agent to carry out leaching reaction after mixing, synchronously adding a stannous chloride solution reducing agent, simultaneously heating in a water bath, taking a gold-containing waste leaching material, mixing the gold-containing waste leaching material with a cyanide-free medicament or an environment-friendly medicament or an iodine-potassium iodide gold leaching solution to carry out leaching reaction, synchronously introducing micro-nano bubbles into the cyanide-free or environment-friendly leaching reaction to obtain a gold-free waste leaching material after the leaching reaction is finished, and calculating the leaching rate of gold according to a test result. The method has the advantages that the natural solubility of the jarosite and the stannate is fully exerted, and the improvement of the recovery rate of gold minerals is facilitated; a small amount of stannous chloride mixed solution is added as a reducing agent, the reaction is more sufficient and thorough by heating in a water bath, the leaching rate of gold minerals is ensured, and the gold recovery rate is high.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of solid wastes, and particularly relates to a method for measuring gold in secondary utilization waste.
Background
With the gradual increase of the update rate of electronic products in the society, the generation rate of secondary utilization resources such as electronic garbage and the like is gradually increased. According to the relevant survey information of the domestic social environment management department: the quantity of the electronic garbage generated in China every year accounts for 60.17% of the proportion of the social garbage. Scientists have found that these electronic wastes contain a remarkable amount of "gold mine" which is a resource amount at least as much as gold obtained by mining. It is known that 50 pounds of gold and 2 million pounds of copper can be extracted from one million abandoned mobile phones if the treatment method is proper, and the method is a considerable secondary utilization resource.
However, the current situation of electronic waste treatment has a great problem, and it is known that the yield of electronic waste is 4470 ten thousand tons in 2016 worldwide, the effective recovery rate is 20%, while the environmental-friendly recovery rate of electronic waste in China is only about 10%, which is obviously lower than the average recovery rate of electronic waste worldwide. A series of problems exist in the recovery and treatment processes, firstly, the system design and the loss of a recovery system are eliminated, so that waste electronic garbage in China is in a rough state, a gray industrial chain of individual household recovery and individual workshop treatment is gradually formed, and normal enterprises are difficult to operate; then, the treatment method is improper and low in efficiency, most of the treatment methods adopted are mechanical crushing and sorting treatment methods, such as rough disassembly, strong acid extraction, random landfill, incineration, abandonment and other treatment means, and the regeneration and harmlessness of resource treatment are ignored: finally, the method for measuring the heavy metal elements in the treatment process is inaccurate, the recovery rate is low, and the precious secondary utilization resources are seriously lost.
According to the data, domestic electronic waste is large in generation base number, the effective treatment proportion is low, heavy metal element measurement methods are improper in the treatment process, the problem of large environmental pollution is brought, and the problem of resource waste is also caused. Therefore, the reasonable solid waste treatment method and the heavy metal element gold measurement method not only can carry out harmless treatment on the gold, but also can recycle the useful components in the gold to the maximum extent, meet the requirement of green chemical development and meet the requirement of the market on gold.
Disclosure of Invention
The invention provides a method for measuring gold in secondary utilization waste, aiming at utilizing the existing secondary resources to the maximum extent, effectively measuring the content of the gold in the waste and obtaining higher recovery rate.
The technical scheme adopted by the invention is that the method comprises the following steps:
1) preparing waste materials;
2) mixing concentrated hydrochloric acid with water to prepare a dilute hydrochloric acid extractant with a certain concentration;
3) mixing stannous chloride with dilute hydrochloric acid, and preparing a reducing agent after the stannous chloride is completely dissolved;
4) mixing the waste material with a dilute hydrochloric acid extracting agent, carrying out leaching reaction, synchronously adding a stannous chloride solution reducing agent in the leaching reaction, simultaneously heating in a water bath, and placing the mixture after heating in the water bath for full reaction, thereby obtaining a gold-containing waste material leaching material after completing the leaching reaction;
5) mixing a cyanide-free medicament or an environment-friendly medicament with alkali liquor to prepare an extracting agent; or iodine-potassium iodide gold leaching solution;
6) and mixing the gold-containing waste leaching material with a cyanide-free medicament or an environment-friendly medicament or an iodine-potassium iodide gold leaching solution, carrying out leaching reaction, synchronously introducing micro-nano bubbles into the cyanide-free or environment-friendly leaching reaction to obtain a gold-free waste leaching material subjected to the leaching reaction, and calculating the leaching rate of gold according to a test result.
In the step 1), the waste is mainly complex salt rich in tin, jarosite and the like, the fineness of the waste is-0.074 mm, and the content of the waste is 60-80%.
In the step 2), the concentration of the prepared dilute hydrochloric acid extractant is 4.8-6 mol/L.
In the step 3), the solid-liquid ratio between the mass of the stannous chloride and the volume of the diluted hydrochloric acid is 1: 4-1: 6 g/ml and the concentration of dilute hydrochloric acid is 4.8-6 mol/L.
In the step 4), the solid-liquid ratio between the mass of the waste and the volume of the dilute hydrochloric acid extractant is 1: 10-1: 20 g/ml, wherein the solid-liquid ratio between the mass of the added waste and the volume of the added stannous chloride reducing agent is 10: 0.25-10: 0.35 g/ml, leaching reaction time of 2-3 h, water bath heating temperature of 60-100 ℃, and water bath reaction time of 1-1.5 h.
In the step 5), the concentration of the cyanide-free medicament in the medicament is 0.05-1.0 mol/L; the pH value is 10-12; the cyanide-free medicament is selected from one of amino acid, thiourea, thiosulfate and halogen.
In the step 5), the concentration of the medicament in the environment-friendly medicament is 0.05-1.0 mol/L; the pH value is 10-12; the environment-friendly medicament is selected from one of a cicada gold beneficiation agent, a minjedgkin beneficiation agent and a saint (Sandios) beneficiation agent.
In the step 5), the alkali liquor is an alkali-containing aqueous solution, and the alkali in the alkali liquor is selected from one of sodium hydroxide, calcium hydroxide and calcium oxide;
in the step 5), the iodine-potassium iodide gold leaching solution is prepared from iodine: potassium iodide: water-12: 28: 200 g/g/ml;
the solid-liquid ratio of the adding mass of the waste to the adding volume of the cyanide-free medicament in the step 6) is 1: 2-8 g/ml;
the solid-liquid ratio of the adding mass of the waste to the adding volume of the environment-friendly medicament in the step 6) is 1: 2-8 g/ml;
the solid-liquid ratio between the mass of the added waste and the volume of the iodine-potassium iodide gold leaching solution is 50: 200 g/ml, when the added mass of the waste is less than 50g, 200ml of gold leaching solution is added according to the minimum proportion.
Leaching reaction temperature of the cyanide-free medicament or the environment-friendly medicament in the step 6) is 40-80 ℃, and leaching reaction time is 24-72 h; leaching reaction of an iodine-potassium iodide system at normal temperature for 1.5-3 h;
the diameter of the micro-nano bubbles is 8 nm-8 um;
the gas-liquid mixing ratio when the micro-nano bubbles are generated is 1: 10-1: 30, of a nitrogen-containing gas;
the origin of the micro-nano bubbles is selected from one of air, oxygen or ozone.
The invention can not only carry out harmless treatment on the secondary utilization waste materials, but also recycle the useful components in the waste materials to the maximum extent, adapts to the development requirement of green chemistry and meets the requirement of the market on gold.
For the leaching process, gold in the waste is secondarily utilized, particularly the gold-containing waste of complex double salt forms wrapped gold, so that the leaching is difficult to be thorough and the recovery is complete. The method has the advantages that the recovery rate of gold in the secondary utilization waste is extremely low, the resource loss is serious, and the method for measuring gold needs to be systematically researched, so that the method enhances the reasonable and comprehensive recovery and utilization of gold. The method is beneficial to accurately determining the grade of the gold ore.
The invention has the following advantages and effects: because the process is carried out under the condition of medium acid environment, the natural solubility of the jarosite and the stannate is fully exerted, and the improvement of the recovery rate of gold minerals is facilitated; a small amount of stannous chloride mixed solution is added as a reducing agent, so that the generation of ferric iron is greatly reduced, and the possibility of forming an oxide film so as to form a package is reduced; the water bath heating ensures that the reaction is more sufficient and thorough, is favorable for smooth reaction and ensures the leaching rate of the gold mineral. The process has the advantages of simple operation, low production cost and high gold recovery rate.
Detailed Description
Example 1
The method takes the waste crushed by the circuit board of the washing machine as a sample, and the gold grade of the raw material is 30.58g/t, and the method specifically comprises the following steps:
1) grinding the crushed raw waste sample until the content of the crushed raw waste sample is 62 percent in the range of-0.074 mm;
2) proportioning dilute hydrochloric acid extractant with the concentration of 4.8 mol/L;
3) 2g of stannous chloride and 10ml of dilute hydrochloric acid with the concentration of 4.8mol/L are mixed to form a stannous chloride solution;
4) the dosage of the hydrochloric acid extractant is determined according to the solid-liquid ratio of the mass of the solid added in the waste to the volume of the dilute hydrochloric acid extractant of 1: 10 g/ml, the relative proportion is increased, the dosage of the stannous chloride reducing agent is 10: 0.25, g/ml, relative proportion increased; the leaching reaction time is 2h, the water bath heating temperature is 60 ℃, and the water bath reaction time is 1 h;
5) the environment-friendly agent is a cicada gold beneficiation agent, the concentration of the traditional Chinese medicine agent prepared from the environment-friendly extractant is 0.05mol/l, the alkali in the alkali liquor is sodium hydroxide, and the pH value is adjusted to 10;
6) the solid-liquid ratio of the adding mass of the waste to the adding volume of the cicada is 1: 2, g/ml, the reaction temperature is 50 ℃, the time is 24 hours, the air source of the micro-nano bubbles is air, and the gas-liquid mixing ratio generated by the micro-nano bubbles is 1: 10.
finally, the leaching rate of gold is calculated to reach 91.5 percent according to the test result, and a good recovery index is obtained.
Example 2
The method takes the crushed waste of the mobile phone circuit board as a sample, and the gold grade of the raw material is 38.24g/t, and the method specifically comprises the following steps:
1) grinding the crushed raw waste sample until the content of-0.074 mm accounts for 70 percent;
2) the concentration of the proportioned hydrochloric acid is 5.4 mol/L;
3) 2g of stannous chloride and 10ml of dilute hydrochloric acid with the concentration of 5.4mol/L are mixed to form a stannous chloride solution;
4) the dosage of the hydrochloric acid extractant is determined according to the solid-liquid ratio of the mass of the solid added in the waste to the volume of the dilute hydrochloric acid extractant of 1: 15 g/ml, the relative proportion is increased, and the dosage of the stannous chloride reducing agent is 10: 0.30, g/ml, relative proportion increased. The leaching reaction time is 2.5h, the water bath heating temperature is 80 ℃, and the water bath reaction time is 1.5 h;
5) the cyanogen-free agent is amino acid, the concentration of the cyanogen-free agent in the prepared cyanogen-free extracting agent is 0.2mol/l, alkali in the alkali liquor is calcium oxide, and the pH value is adjusted to be 11;
6) the solid-liquid ratio of the adding mass of the waste to the adding volume of histidine is 1: 2, g/ml, the cyanide-free reaction temperature is 70 ℃, the time is 48 hours, the gas source of the micro-nano bubbles is oxygen, and the gas-liquid mixing ratio generated by the micro-nano bubbles is 1: 20.
finally, the leaching rate of gold is calculated to reach 94.32 percent according to the test result, and a good recovery index is obtained.
Example 3
The method takes the waste material crushed by the computer circuit board as a sample, and the gold grade of the raw material is 44.61g/t, and comprises the following steps:
1) grinding the crushed raw waste sample until the content of-0.074 mm accounts for 80 percent;
2) the concentration of the proportioned hydrochloric acid is 6 mol/L;
3) 2g of stannous chloride and 10ml of dilute hydrochloric acid with the concentration of 6mol/L are mixed to form a stannous chloride solution; 4) the dosage of the hydrochloric acid extractant is determined according to the solid-liquid ratio of the mass of the solid added in the waste to the volume of the hydrochloric acid extractant of 1: 20 g/ml, relative proportion increased. The dosage of the stannous chloride reducing agent is 10 according to the solid-liquid ratio between the mass of the added waste and the volume of the added stannous chloride reducing agent: 0.35, g/ml, relative proportion increased. The leaching reaction time is 3h, the water bath heating temperature is 100 ℃, and the water bath reaction time is 1.5 h;
5) the iodine-potassium iodide gold leaching system is characterized in that the solid-liquid ratio of the solid mass added in the waste to the volume added in the gold leaching extractant is 50: 200, g/ml, relative proportion increased;
6) the reaction temperature is normal temperature and the reaction time is 2 hours;
finally, the leaching rate of gold is calculated to reach 97.83 percent according to the test result, and a good recovery index is obtained.
Example 4
5) The environment-friendly medicament is a Minjie gold extracting agent, the concentration of the medicament in the prepared environment-friendly extracting agent is 0.5mol/l, the alkali in the alkali liquor is sodium hydroxide, and the pH value is adjusted to 11;
6) the solid-liquid ratio of the added mass of the waste to the added volume of the Minjie gold reagent is 1: 5, the ratio of the water to the water is 5 g/ml,
the rest of the procedure was the same as in example 1.
Example 5
5) The environment-friendly agent is a Sandios mineral processing agent, the concentration of the agent in the prepared environment-friendly extracting agent is 1.0mol/l, the alkali in the alkali liquor is sodium hydroxide, and the pH value is adjusted to be 12;
6) the solid-liquid ratio of the added mass of the waste to the added volume of the Minjie gold reagent is 1: 8, the concentration of the active carbon in g/ml,
the rest of the procedure was the same as in example 1.
Example 6
5) The cyanogen-free agent is thiourea, the concentration of the cyanogen-free agent in the prepared cyanogen-free extracting agent is 0.5mol/l, the alkali in the alkali liquor is calcium oxide, and the pH value is adjusted to be 10;
6) the solid-liquid ratio of the adding mass of the waste to the adding volume of the thiourea is 1: 5, the ratio of the water to the water is 5 g/ml,
the rest of the procedure was the same as in example 2.
Example 7
5) The cyanide-free agent is thiosulfate, the concentration of the cyanide-free agent in the prepared cyanide-free extracting agent is 1.0mol/l, the alkali in the alkali liquor is calcium oxide, and the pH value is adjusted to be 12;
6) the solid-liquid ratio of the adding mass of the waste to the adding volume of the thiourea is 1: 8, the concentration of the active carbon in g/ml,
the rest of the procedure was the same as in example 2.
Example 8
5) The cyanogen-free agent is halogen, the concentration of the cyanogen-free agent in the prepared cyanogen-free extracting agent is 0.05mol/l, the alkali in the alkali liquor is calcium oxide, and the pH value is adjusted to be 10;
6) the solid-liquid ratio of the adding mass of the waste to the adding volume of the thiourea is 1: 5, the ratio of the water to the water is 5 g/ml,
the rest of the procedure was the same as in example 2.
Claims (10)
1. A method for measuring gold in secondary utilization waste is characterized by comprising the following steps:
1) preparing waste materials;
2) mixing concentrated hydrochloric acid with water to prepare a dilute hydrochloric acid extractant with a certain concentration;
3) mixing stannous chloride with dilute hydrochloric acid, and preparing a reducing agent after the stannous chloride is completely dissolved;
4) mixing the waste material with a dilute hydrochloric acid extracting agent, carrying out leaching reaction, synchronously adding a stannous chloride solution reducing agent in the leaching reaction, simultaneously heating in a water bath, and placing the mixture after heating in the water bath for full reaction, thereby obtaining a gold-containing waste material leaching material after completing the leaching reaction;
5) mixing a cyanide-free medicament or an environment-friendly medicament with alkali liquor to prepare an extracting agent; or iodine-potassium iodide gold leaching solution;
6) and mixing the gold-containing waste leaching material with a cyanide-free medicament or an environment-friendly medicament or an iodine-potassium iodide gold leaching solution, carrying out leaching reaction, synchronously introducing micro-nano bubbles into the cyanide-free or environment-friendly leaching reaction to obtain a gold-free waste leaching material subjected to the leaching reaction, and calculating the leaching rate of gold according to a test result.
2. The method for measuring gold in secondary used waste according to claim 1, wherein the method comprises the following steps: in the step 1), the waste is mainly complex salt rich in tin, jarosite and the like, the fineness of the waste is-0.074 mm, and the content of the waste is 60-80%.
3. The method for measuring gold in secondary used waste according to claim 1, wherein the method comprises the following steps: in the step 2), the concentration of the prepared dilute hydrochloric acid extractant is 4.8-6 mol/L.
4. The method for measuring gold in secondary used waste according to claim 1, wherein the method comprises the following steps: in the step 3), the solid-liquid ratio between the mass of the stannous chloride and the volume of the diluted hydrochloric acid is 1: 4-1: 6 g/ml and the concentration of dilute hydrochloric acid is 4.8-6 mol/L.
5. The method for measuring gold in secondary used waste according to claim 1, wherein the method comprises the following steps: in the step 4), the solid-liquid ratio between the mass of the waste and the volume of the dilute hydrochloric acid extractant is 1: 10-1: 20 g/ml, wherein the solid-liquid ratio between the mass of the added waste and the volume of the added stannous chloride reducing agent is 10: 0.25-10: 0.35 g/ml, leaching reaction time of 2-3 h, water bath heating temperature of 60-100 ℃, and water bath reaction time of 1-1.5 h.
6. The method for measuring gold in secondary used waste according to claim 1, wherein the method comprises the following steps: in the step 5), the concentration of the cyanide-free medicament in the medicament is 0.05-1.0 mol/L; the pH value is 10-12; the cyanide-free medicament is selected from one of amino acid, thiourea, thiosulfate and halogen.
7. The method for measuring gold in secondary used waste according to claim 1, wherein the method comprises the following steps: in the step 5), the concentration of the medicament in the environment-friendly medicament is 0.05-1.0 mol/L; the pH value is 10-12; the environment-friendly medicament is selected from one of a cicada gold beneficiation agent, a minjedgkin beneficiation agent and a saint (Sandios) beneficiation agent.
8. The method for measuring gold in secondary used waste according to claim 1, wherein the method comprises the following steps: in the step 5), the alkali liquor is an alkali-containing aqueous solution, and the alkali in the alkali liquor is selected from one of sodium hydroxide, calcium hydroxide and calcium oxide.
9. The method for measuring gold in secondary used waste according to claim 1, wherein the method comprises the following steps: in the step 5), the iodine-potassium iodide gold leaching solution is prepared from iodine: potassium iodide: water-12: 28: 200 g/g/ml.
10. The method for measuring gold in secondary used waste according to claim 1, wherein the method comprises the following steps:
the solid-liquid ratio of the adding mass of the waste to the adding volume of the cyanide-free medicament in the step 6) is 1: 2-8 g/ml;
the solid-liquid ratio of the adding mass of the waste to the adding volume of the environment-friendly medicament in the step 6) is 1: 2-8 g/ml;
the solid-liquid ratio between the mass of the waste material added in the step 6) and the volume of the iodine-potassium iodide gold leaching solution is 50: 200 g/ml, when the added mass of the waste is less than 50g, adding 200ml of gold leaching solution according to the lowest proportion;
leaching reaction temperature of the cyanide-free medicament or the environment-friendly medicament in the step 6) is 40-80 ℃, and leaching reaction time is 24-72 h; leaching reaction of an iodine-potassium iodide system at normal temperature for 1.5-3 h;
the diameter of the micro-nano bubbles is 8 nm-8 um;
the gas-liquid mixing ratio when the micro-nano bubbles are generated is 1: 10-1: 30, of a nitrogen-containing gas;
the origin of the micro-nano bubbles is selected from one of air, oxygen or ozone.
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