CN111996364B - Method for recovering gold from cyanidation tailings and synchronously magnetizing iron - Google Patents

Method for recovering gold from cyanidation tailings and synchronously magnetizing iron Download PDF

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CN111996364B
CN111996364B CN202010895484.6A CN202010895484A CN111996364B CN 111996364 B CN111996364 B CN 111996364B CN 202010895484 A CN202010895484 A CN 202010895484A CN 111996364 B CN111996364 B CN 111996364B
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cyanidation tailings
gold
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tailings
cinder
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CN111996364A (en
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郭学益
秦红
田庆华
于大伟
张磊
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Central South University
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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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • C22B1/08—Chloridising roasting
    • 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
    • C22B11/02—Obtaining noble metals by dry processes
    • C22B11/021—Recovery of noble metals from waste materials
    • C22B11/023—Recovery of noble metals from waste materials from pyrometallurgical residues, e.g. from ashes, dross, flue dust, mud, skim, slag, sludge
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • C22B7/002—Dry processes by treating with halogens, sulfur or compounds thereof; by carburising, by treating with hydrogen (hydriding)
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up slag
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    • 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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Abstract

The invention discloses a method for recovering gold from cyanidation tailings and synchronously magnetizing iron, which comprises the following steps: (1) grinding and uniformly mixing the cyanidation tailings, the chlorinating agent and the pyrite to obtain a mixture; (2) roasting the mixture obtained in the step (1) in a weak oxidizing atmosphere to obtain flue gas and cinder; (3) collecting flue gas to recover gold, and carrying out magnetic separation on the cinder to recover iron. When the invention is used for treating cyanidation tailings, gold is volatilized into flue gas to be enriched, and gases formed by valuable metals such as lead, zinc, arsenic and the like are volatilized and removed from the tailings; meanwhile, the iron oxide in the slag is converted into magnetite, and impurity metals are not remained in the magnetite, so that the grade of the magnetite is greatly improved, and the subsequent iron making difficulty is reduced.

Description

Method for recovering gold from cyanidation tailings and synchronously magnetizing iron
Technical Field
The invention belongs to the field of comprehensive utilization of tailing resources, and particularly relates to a method for treating cyanided tailings.
Background
China has been the biggest gold producing country in the world for more than 10 years, and the discharged cyanidation tailings each year reaches millions of tons. Because of containing cyanide and heavy metals such as arsenic, lead and the like, the piled cyanide tailings not only occupy a large amount of land, but also pollute the surface and underground water system, and bring serious threats to the ecological environment and the health of residents. The comprehensive utilization of the cyanidation tailings can realize the high-efficiency utilization of resources and effectively protect the ecological environment.
The existing comprehensive utilization method of cyanidation tailings mainly comprises a direct acid dissolution method, a reduction roasting method, a chlorination method, an iron making-electrolysis method, a sulfuric acid curing method, a thiourea leaching method and the like. Patent publication No. CN102168176A proposes mixing cyanidation tailings with hydrochloric acid, heating and continuously stirring, then adding sodium hypochlorite and chlorine gas and continuously stirring, and separating filtrate and filter residue. The patent with publication number CN111394577A discloses a method for leaching coated gold hematite in secondary calcine by oxalic acid, which is key to solve the problem of gold coating in gold roasting. The patent with publication number CN111151383A discloses a method for recycling gold by fractional flow flotation of cyanidation tailings, which effectively recycles the gold of micro-fine fraction in the cyanidation tailings by flotation technology, and the Au grade of the final gold concentrate is not less than 16.03g/t, and the Au recovery rate is not less than 76.81%. Patent publication No. CN111100995A discloses a method for recovering gold from roasting-cyanidation tailings, which facilitates subsequent gold leaching by destroying the mineral structure by roasting with the addition of sodium salts. The patent with publication number CN110819820A discloses a method for extracting gold by chlorination and volatilization of roasted cyanided tailings, which improves the volatilization rate of gold and the effective utilization rate of calcium chloride by prolonging the high-temperature-cooling zone and shortening the retention time of materials in the low-temperature-medium-temperature heating zone. The patent with publication number CN106498177A discloses a method for recovering gold, silver and iron from roasting cyanidation tailings and synchronously realizing harmless treatment, the method comprises the steps of mixing dried roasting cyanidation tailings with a fluxing agent and a reducing agent, roasting, carrying out hot roasting, quenching with water, cooling, grinding, carrying out flotation to remove residual carbon, leaching gold and silver by using an environment-friendly gold leaching agent in a non-cyanide manner, and carrying out magnetic separation on leaching residues to obtain iron concentrate.
The method in the prior art only focuses on the recovery of gold, omits the recovery and utilization of other valuable elements in cyanidation tailings, and has the problems of complex process flow and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects and shortcomings in the background technology, and provide a method for recovering gold from cyanidation tailings and synchronously magnetizing iron, which has the advantages of short process flow, low cost and high metal recovery rate. In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for recovering gold from cyanidation tailings and synchronously magnetizing iron comprises the following steps:
(1) grinding and uniformly mixing the cyanidation tailings, the chlorinating agent and the pyrite to obtain a mixture;
(2) roasting the mixture obtained in the step (1) in a weak oxidizing atmosphere to obtain flue gas and cinder;
(3) collecting flue gas to recover gold, and carrying out magnetic separation on the cinder to recover iron.
In the method for recovering gold from cyanidation tailings and synchronously magnetizing iron, the cyanidation tailings preferably contain 1-35g/t of Au and 34-70% of Fe2O3，1-20％SiO2And the other components are not limited. The cyanidation tailings with the components in the content are particularly suitable for reacting with the chlorinating agent and the pyrite substance in the invention under a weak oxidizing atmosphere, so that gold is volatilized and simultaneously iron is magnetized into ferroferric oxide.
In the above method for recovering gold from cyanidation tailings and magnetizing iron simultaneously, the chlorinating agent is preferably calcium chloride.
In the method for recovering gold from cyanidation tailings and magnetizing iron synchronously, the addition amount of the chlorinating agent is preferably 2-25% of the mass of the cyanidation tailings. The excessive use amount of calcium chloride is high in cost, and can cause the generation of calcium silicate salt, so that the melting point of slag is reduced, and the sintering phenomenon is easy to occur. The low consumption of calcium chloride is low in gold volatilization rate, and the sulfur added into sulfide can not generate calcium sulfate to be fixed due to the low consumption of calcium, so that the sulfur dioxide content of the flue gas is high, and the burden of flue gas treatment is heavy. The type of the chlorinating agent is selected, the dosage of the chlorinating agent is determined to be inseparable connected with the reaction system of the invention for adding the pyrite mineral, and not only the function of the chlorinating agent but also the influence of the chlorinating agent on the whole reaction system need to be considered.
In the above method for recovering gold from cyanidation tailings and magnetizing iron synchronously, preferably, the pyrite mineral is one or both of pyrite and ferrous sulfide.
In the method for recovering gold from cyanidation tailings and magnetizing iron synchronously, the addition amount of the pyrite mineral is preferably 1-15% of the mass of the cyanidation tailings. The addition of the pyrite substance in the invention mainly has the following functions: firstly, the decomposition of calcium chloride is promoted, and secondly, the reaction atmosphere is controlled, so that the generation of ferroferric oxide is facilitated. The low gold volatilization rate caused by adding too little pyrite mineral can not obtain ferroferric oxide at the same time; the excessive addition of the sulfur iron mineral is beneficial to the generation of ferroferric oxide, but can cause the reduction of the gold volatilization rate.
In the above method for recovering gold from cyanidation tailings and magnetizing iron simultaneously, preferably, the weakly oxidizing atmosphere comprises a mixed atmosphere of oxygen and inert gas, and the volume ratio of the oxygen to the inert gas is (0.01-1): 1, the inert gas is one or two of nitrogen or argon. More preferably, the volume ratio of the oxygen gas to the inert gas is (0.01-0.1): 1. the weak oxidizing atmosphere is adopted in the invention to ensure the volatilization rate of gold and prevent the over-reduction of iron into iron dioxide and elementary iron (which can cause the reduction of the melting point of slag and the sintering phenomenon) so as to obtain the ferroferric oxide. The weakly oxidizing atmosphere can be adjusted depending on the oxidizing or reducing atmosphere required for the reaction system. In the invention, the control of the weak oxidizing atmosphere is the key point of the method for recovering gold from cyanidation tailings and synchronously magnetizing iron, the oxygen content in the weak oxidizing atmosphere has a very significant influence on the effect of the method, and both too low and too high oxygen content can influence the volatilization rate of gold and the generation rate of iron to generate ferroferric oxide, and we preferably show that the volume ratio of oxygen to inert gas is controlled to be (0.01-0.1): 1, gold, zinc, lead and the like can be volatilized to the maximum extent, more iron can be converted into ferroferric oxide, the yield of the ferroferric oxide is higher, and impurity elements are less.
In the above method for recovering gold from the tailings of cyanidation and magnetizing iron simultaneously, preferably, the weakly oxidizing atmosphere is a flowing atmosphere, and the gas introduction rate of the weakly oxidizing atmosphere is controlled to be not more than 20L/(kg · min). The introduction speed of the weak oxidizing atmosphere is mainly the oxidation-reduction atmosphere influencing the reaction.
In the method for recovering gold from cyanidation tailings and magnetizing iron synchronously, the roasting temperature is preferably 600-1200 ℃, and the roasting time is preferably 10-120 min.
According to the invention, by adding sulfide minerals in the process of chloridizing and roasting cyanidation tailings and setting weak oxidizing atmosphere in a matching manner, gold is chloridized to form gas, and the gas is volatilized from the tailings and is discharged into flue gas in the roasting process, meanwhile, ferric oxide in the slag is converted into magnetite, and impurities such as lead, zinc and arsenic are volatilized into the flue gas and are removed and do not remain in the magnetite, so that the grade of the magnetite is greatly improved, and the difficulty in subsequent iron making is reduced. The chemical reaction equation mainly generated by the invention is as follows:
FeS2+28Fe2O3+2CaCl2＝19Fe3O4+2CaSO4+2Cl2(g)；
or FeS +16Fe2O3+CaCl2＝11Fe3O4+CaSO4+Cl2(g) (ii) a (formula one)
Au+Cl2(g) → AuClx (g); (formula II)
MOx+Cl2→MCl(g)+O2(g) (wherein M represents lead, zinc, arsenic, etc.); (III)
The chlorine generated in the first formula is used for volatilizing gold, lead, zinc, arsenic and the like in the slag (namely, the second formula and the third formula), so that iron oxide in the slag is magnetized while gold is recovered.
According to the formula I, the dosage of the pyrite mineral adopted in the invention can be less, and the dosage of the additive can be greatly reduced.
Compared with the prior art, the invention has the advantages that:
1. when the method is used for treating the cyanidation tailings, gold is volatilized into flue gas to be enriched by controlling the weak oxidation atmosphere and adopting pyrite substances, and valuable metal forming gases such as lead, zinc, arsenic and the like are volatilized and removed from the slag; meanwhile, the iron oxide in the slag is converted into magnetite, and impurity metals are not remained in the magnetite, so that the grade of the magnetite is greatly improved, and the subsequent iron making difficulty is reduced.
2. In addition, the added pyrite mineral has another important function of promoting the decomposition of a chlorinating agent, strengthening chlorination volatilization reaction, being beneficial to the volatilization and separation of impurity elements and obtaining purer magnetite.
3. The invention adopts the pyrite additive to treat cyanided tailings, and the pyrite additive has wide sources, low price and no secondary pollution and is beneficial to the generation of ferroferric oxide.
4. The method for recovering gold from cyanidation tailings and synchronously magnetizing iron has the advantages of short process flow, low cost, high metal recovery rate and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is an XRD pattern of cyanidation tailings #1 employed in the present invention.
FIG. 2 is an XRD pattern of cyanidation tailings #3 employed in the present invention.
FIG. 3 is an XRD pattern of the clinker in example 1.
FIG. 4 is an XRD pattern of the clinker in example 4.
FIG. 5 is an XRD pattern of the clinker in example 5.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The following examples and comparative examples were conducted by using raw material composition analyses shown in tables 1 and 2, and phase analyses of cyanide tailings #1 and cyanide tailings #3 shown in FIGS. 1 and 2, respectively.
Table 1: chemical composition of cyanidation tailings
Name of material Au(g/t) Ag(g/t) As(％) S(％) Fe(％) Zn(％) Pb(％) Cu(％)
Cyanidation tailings #1 30.10 51.74 2.68 0.72 47.82 1.06 1.01 0.11
Cyanidation tailings #2 7.96 29.42 0.92 1.21 36.14 0.89 1.93 0.31
Cyanidation tailings #3 11.94 27.37 1.40 1.14 34.60 0.56 0.44 0.32
The chemical composition of pyrite is shown in table 2 below.
Table 2: chemical composition of pyrite
Name (R) Fe S SiO2
Mass fraction (%) 43.36 45.26 4.63
Example 1:
a method for recovering gold from cyanidation tailings and synchronously magnetizing iron comprises the following steps:
(1) grinding 1000g of cyanidation tailings #1, 50g of calcium chloride and 20g of pyrite, and uniformly mixing to obtain a mixture; the XRD pattern of the cyanidation tailings is shown in figure 1;
(2) putting the mixture obtained in the step (1) into a tubular furnace, and introducing into the tubular furnace at a rate of 5L/(kg. min) according to the volume ratio of oxygen to nitrogen being 0.02: 1, starting the tubular furnace to heat, raising the temperature to 950 ℃, keeping the temperature for roasting for 1.5h, and stopping ventilation after the temperature of the tubular furnace is reduced to 50 ℃ after roasting is finished to obtain smoke and cinder;
(3) sampling and detecting the contents of gold, arsenic, iron, zinc, lead and copper in the cinder, and carrying out phase analysis and magnetic separation on the cinder. The volatilization rates of gold, arsenic, iron, zinc, lead and copper in the cyanidation tailings are calculated to be 87.94%, 93.76%, 3.75%, 98.79%, 99.26% and 79.43% respectively. Phase analysis is shown in fig. 3, and results show that iron oxide in cyanidation tailings is converted into ferroferric oxide; as a result of the magnetic separation, 630.79g of a magnetic substance was magnetically separated. The results of the examples show that the process of the embodiment can efficiently extract gold from the slag, magnetize ferric oxide in the slag, and volatilize arsenic, iron, zinc, lead, copper and other elements simultaneously, thereby obtaining ferroferric oxide concentrate.
Comparative example 1:
a method for recovering gold from cyanidation tailings and synchronously magnetizing iron comprises the following steps:
(1) grinding 1000g of cyanidation tailings #1 and 50g of calcium chloride, and uniformly mixing to obtain a mixture;
(2) putting the mixture obtained in the step (1) into a tubular furnace, and introducing into the tubular furnace at a rate of 5L/(kg. min) according to the volume ratio of oxygen to nitrogen being 0.02: 1, starting the tubular furnace to heat, raising the temperature to 950 ℃, keeping the temperature for roasting for 1.5h, and stopping ventilation after the temperature of the tubular furnace is reduced to 50 ℃ after roasting is finished to obtain smoke and cinder;
(3) sampling and detecting the contents of gold, arsenic, iron, zinc, lead and copper in the cinder, and carrying out magnetic separation on the cinder. The volatilization rates of gold, arsenic, iron, zinc, lead and copper in the cyanidation tailings are calculated to be 68.94%, 94.71%, 3.75%, 98.39%, 99.76% and 78.43% respectively. As a result of the magnetic separation, 20.47g of the magnetic substance was magnetically separated. Comparison with example 1 shows that the gold volatility of the comparative example is low, and iron in slag cannot be magnetized to obtain ferroferric oxide.
Comparative example 2:
a method for recovering gold from cyanidation tailings and synchronously magnetizing iron comprises the following steps:
(1) grinding 1000g of cyaniding tailings #1, 50g of calcium chloride and 20g of coke powder (84.4% of fixed carbon, 0.8% of S, 3.1% of volatile matter and 12.5% of common ash content), and uniformly mixing to obtain a mixture;
(2) putting the mixture obtained in the step (1) into a tubular furnace, and introducing into the tubular furnace at a rate of 5L/(kg. min) according to the volume ratio of oxygen to nitrogen being 0.02: 1, starting the tubular furnace to heat, raising the temperature to 950 ℃, keeping the temperature for roasting for 1.5h, and stopping ventilation after the temperature of the tubular furnace is reduced to 50 ℃ after roasting is finished to obtain smoke and cinder;
(3) sampling and detecting the contents of gold, arsenic, iron, zinc, lead and copper in the cinder, and carrying out magnetic separation on the cinder. The volatilization rates of gold, arsenic, iron, zinc, lead and copper in the cyanidation tailings are calculated to be 43.65%, 7.21%, 12.83%, 57.30%, 80.37% and 28.60% respectively. As a result of the magnetic separation, 509.13g of a magnetic substance was magnetically separated. Comparison with example 1 shows that the gold and other metals of this comparative example have a low volatilization rate and cause a slight increase in the volatilization rate of iron, and that the magnetic substance obtained is lower than that of example 1.
Example 2:
a method for recovering gold from cyanidation tailings and synchronously magnetizing iron comprises the following steps:
(1) grinding 1000g of cyanidation tailings #1, 70g of calcium chloride and 80g of pyrite, and uniformly mixing to obtain a mixture;
(2) putting the mixture obtained in the step (1) into a tubular furnace, and introducing into the tubular furnace at a speed of 10L/(kg. min) according to the volume ratio of oxygen to nitrogen being 0.01: 1, starting the tubular furnace to heat, raising the temperature to 1000 ℃, keeping the temperature for roasting for 1h, and stopping ventilation after the temperature of the tubular furnace is reduced to 50 ℃ after roasting is finished to obtain smoke and cinder;
(3) sampling and detecting the contents of gold, arsenic, iron, zinc, lead and copper in the cinder, and carrying out magnetic separation on the cinder. The volatilization rates of gold, arsenic, iron, zinc, lead and copper in the cyanidation tailings are calculated to be 95.10%, 99.53%, 6.27%, 99.31%, 99.7% and 81.37% respectively. As a result of the magnetic separation, 681.93g of a magnetic substance was magnetically separated.
Example 3:
a method for recovering gold from cyanidation tailings and synchronously magnetizing iron comprises the following steps:
(1) grinding 1000g of cyanidation tailings #1, 140g of calcium chloride and 120g of pyrite, and uniformly mixing to obtain a mixture;
(2) putting the mixture obtained in the step (1) into a tubular furnace, and introducing into the tubular furnace at a rate of 1L/(kg. min) according to a volume ratio of oxygen to nitrogen being 1: 1, starting the tubular furnace to heat, raising the temperature to 800 ℃, keeping the temperature for roasting for 1h, and stopping ventilation after the temperature of the tubular furnace is reduced to 50 ℃ after roasting is finished to obtain smoke and cinder;
(3) sampling and detecting the contents of gold, arsenic, iron, zinc, lead and copper in the cinder, and carrying out magnetic separation on the cinder. The volatilization rates of gold, arsenic, iron, zinc, lead and copper in the cyanidation tailings are calculated to be 74.52%, 79.37%, 1.74%, 86.47%, 78.23% and 64.95% respectively. As a result of the magnetic separation, 565.85g of a magnetic substance was magnetically separated.
Example 4:
a method for recovering gold from cyanidation tailings and synchronously magnetizing iron comprises the following steps:
(1) grinding 1000g of cyanidation tailings #2, 60g of calcium chloride and 20g of pyrite, and uniformly mixing to obtain a mixture;
(2) putting the mixture obtained in the step (1) into a tubular furnace, and introducing into the tubular furnace at a rate of 5L/(kg. min) according to a volume ratio of oxygen to nitrogen of 0.1: 1, starting the tubular furnace to heat, raising the temperature to 1050 ℃, keeping the temperature for roasting for 80min, and stopping ventilation after the temperature of the tubular furnace is reduced to 50 ℃ after roasting is finished to obtain smoke and cinder;
(3) sampling and detecting the contents of gold, arsenic, iron, zinc, lead and copper in the cinder, and carrying out phase analysis and magnetic separation on the cinder. The volatilization rates of gold, arsenic, iron, zinc, lead and copper in the cyanidation tailings are calculated to be 98.37%, 99.52%, 9.64%, 99.73%, 99.36% and 90.64% respectively. Phase analysis is shown in fig. 4, and results show that iron oxide in cyanidation tailings is converted into ferroferric oxide; as a result of the magnetic separation, 627.51g of a magnetic substance was magnetically separated.
Example 5:
a method for recovering gold from cyanidation tailings and synchronously magnetizing iron comprises the following steps:
(1) grinding 1000g of cyanidation tailings #3, 50g of calcium chloride and 30g of pyrite, and uniformly mixing to obtain a mixture; the XRD pattern of the cyanidation tailings is shown in figure 2;
(2) putting the mixture obtained in the step (1) into a tube furnace, and introducing into the tube furnace at a speed of 8L/(kg. min) according to the volume ratio of oxygen to nitrogen being 0.0125: 1, starting the tubular furnace to heat, raising the temperature to 1000 ℃, keeping the temperature for roasting for 120min, and stopping ventilation after the temperature of the tubular furnace is reduced to 50 ℃ after roasting is finished to obtain smoke and cinder;
(3) sampling and detecting the contents of gold, arsenic, iron, zinc, lead and copper in the cinder, and carrying out phase analysis and magnetic separation on the cinder. The volatilization rates of gold, arsenic, iron, zinc, lead and copper in the cyanidation tailings are calculated to be 99.64%, 98.83%, 11.73%, 99.05%, 99.43% and 94.17% respectively. Phase analysis is shown in fig. 5, and results show that iron oxide in cyanidation tailings is converted into ferroferric oxide; as a result of the magnetic separation, 520.37g of a magnetic substance was magnetically separated.

Claims (1)

1. A method for recovering gold from cyanidation tailings and synchronously magnetizing iron is characterized by comprising the following steps:
(1) grinding and uniformly mixing the cyanidation tailings, the chlorinating agent and the pyrite to obtain a mixture;
(2) roasting the mixture obtained in the step (1) in a weak oxidizing atmosphere to obtain flue gas and cinder;
(3) collecting flue gas to recover gold, and carrying out magnetic separation on the cinder to recover iron;
the cyanidation tailings contain 1-35g/t of Au and 34-70% of Fe2O3；
The weak oxidizing atmosphere comprises a mixed atmosphere of oxygen and inert gas, and the volume ratio of the oxygen to the inert gas is (0.01-0.1): 1, the inert gas is one or two of nitrogen or argon;
the weak oxidizing atmosphere adopts a flowing atmosphere, and the gas introduction speed of the weak oxidizing atmosphere is controlled to be not more than 20L/(kg-min);
the addition amount of the chlorinating agent is 2-25% of the mass of the cyanidation tailings;
the addition amount of the pyrite mineral is 1-15% of the mass of the cyanidation tailings;
the chlorinating agent is calcium chloride;
the pyrite mineral is one or two of pyrite and ferrous sulfide;
the roasting temperature is 600-1200 ℃, and the roasting time is 10-120 min.
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CN113430365A (en) * 2021-07-12 2021-09-24 山东国大黄金股份有限公司 Method for recovering iron ore concentrate by roasting cyanogen-containing waste residues with pyrite
CN113355524B (en) * 2021-08-11 2021-10-08 北京矿冶研究总院 Ultralow-temperature sublevel matte gold-capturing hazardous waste treatment method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101225468A (en) * 2008-01-30 2008-07-23 张伟晓 Method for recovering gold, silver, iron and lead from acid calcination slag by magnetization chlorination process
CN104726716A (en) * 2015-03-31 2015-06-24 招金矿业股份有限公司 Method for extracting gold from cyanidation tailings

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101225468A (en) * 2008-01-30 2008-07-23 张伟晓 Method for recovering gold, silver, iron and lead from acid calcination slag by magnetization chlorination process
CN104726716A (en) * 2015-03-31 2015-06-24 招金矿业股份有限公司 Method for extracting gold from cyanidation tailings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Pyrite enhanced chlorination roasting and its efficacy in gold and silver recovery from gold tailing;Qin Hong等;《Separation and Purification Technology》;20200527;第1-10页 *

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