CN115888970A - Cyanide removal treatment method for cyanidation tailings - Google Patents
Cyanide removal treatment method for cyanidation tailings Download PDFInfo
- Publication number
- CN115888970A CN115888970A CN202211467151.9A CN202211467151A CN115888970A CN 115888970 A CN115888970 A CN 115888970A CN 202211467151 A CN202211467151 A CN 202211467151A CN 115888970 A CN115888970 A CN 115888970A
- Authority
- CN
- China
- Prior art keywords
- cyanide
- tailings
- treating agent
- treatment
- treatment method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a cyanide removal treatment method for cyanide tailings, which is characterized by comprising the following steps: (1) pretreatment: pulping cyaniding tailings by using water, and adjusting the pH value to 4-6; (2) decyanation treatment: adding a main treating agent into the system obtained in the step (1), and reacting for 0.1 to 2h; adding a secondary treating agent, and reacting for 0.1 to 1h; wherein the main treating agent is one or more than two of sodium ferrate, ferrous sulfate, ferric sulfate, EDDHA-Fe, EDTA-Fe and ferric acetate; wherein the secondary treating agent is a mixture comprising cobalt 2-ethylhexanoate, octadecylamine and isopropanol; and (3) carrying out flotation separation treatment. The invention effectively solves the problem of separating the cyanogen complex from the ore pulp, simplifies the process and improves the cyanogen removal efficiency.
Description
Technical Field
The invention belongs to the technical field of hazardous waste treatment, and particularly relates to a cyanide removal treatment method for cyanide tailings.
Background
The cyaniding metallurgy technology is one of the main methods for gold extraction in gold mine enterprises at home and abroad, and has a history of more than one hundred years to date. The method has the advantages of simple process, wide action range, high recovery rate, low unit cost, strong adaptability to ores and the like, and is widely applied to practical production of gold extraction since the last century. Due to the use of cyanide, the waste water and tailings discharged by gold smelting often contain cyanide. According to statistics, the yield of cyanidation tailings in the main gold producing areas of China, south Africa, australia and the like is about 5 hundred million tons each year. At present, cyanide tailings are mainly piled or buried, and residual cyanide in the tailings is easy to cause serious environmental pollution and ecological harm to soil, water and the like.
At present, cyanide tailings are subjected to decyanation treatment by a principle of cyanide destruction, cyanide conversion and cyanide recovery. Among them, the cyanide destruction method is the mainstream of the decyanation research of cyanide tailings, and includes an alkaline chlorination method, an INCO method, a hydrogen peroxide oxidation method, an ozone oxidation method, a pressurized hydrolysis method, an electrolytic oxidation method, a ferrate oxidation method, a peroxosulfuric acid oxidation method, a pyrolysis method (incineration method), and the like. The cyanide conversion method includes a zinc salt precipitation method, an iron salt precipitation method, a copper salt precipitation method, and the like. The cyanide recovery method includes an acid recovery method, an ion exchange method, and the like.
However, the cyanide conversion method usually requires the generation of free cyanogen and metal cyanide complex ions to generate precipitates, which are usually used in the treatment of cyanide-containing wastewater, and the complete separation of the cyanide-containing wastewater from cyanide tailings becomes a problem; therefore, the application of the method in decyanation of cyanidation tailings is limited. Among them, iron salts are widely available and inexpensive, and are commonly used in the cyanide conversion method, but have a problem of deep separation in addition to the above-mentioned separation problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a cyanide removal treatment method for cyanide tailings, which solves the problem of separation of cyanide in cyanide tailings treatment and has high cyanide removal efficiency.
The specific technical scheme is as follows:
a cyanide removal treatment method for cyanidation tailings comprises the following steps:
(1) Pretreatment: slurry mixing cyaniding tailings with water, and adjusting the pH value to 4 to 6;
(2) Decyanation treatment: adding a main treating agent into the ore pulp obtained in the step (1), and reacting for 0.1 to 2h; adding an auxiliary treating agent, and reacting for 0.1 to 1h;
wherein the main treating agent is one or more than two of sodium ferrate, ferrous sulfate, ferric sulfate, EDDHA-Fe, EDTA-Fe and ferric acetate;
wherein the secondary treating agent is a mixture comprising cobalt 2-ethylhexanoate, octadecylamine and isopropanol;
(3) And (5) flotation separation treatment.
Wherein, continuous stirring is carried out in the reaction process in the step (2).
In particular, the process flow of the present invention can be referred to fig. 1.
The main treating agent and cyanide in cyaniding tailings form iron salt-cyanide complex, and the secondary treating agent may be used as floating agent to form foam with iron-cyanide complex and float on the surface of ore pulp, so as to eliminate the upper layer foam conveniently and obtain tailings and solid cyanide with cyanide eliminated effectively.
Further, in the step (2), in the secondary treating agent, the ratio of cobalt 2-ethylhexanoate: octadecylamine: the mass ratio of the isopropanol is 1 (1.5-10) to (30-55).
And further, the dosage of the secondary treating agent is 0.2-1kg/t calculated by the ore pulp obtained in the step (1).
Further, in the step (2), the dosage of the main treatment agent is 0.5-3kg/t calculated by the ore pulp obtained in the step (1).
Further, in the step (1), the size mixing concentration is 10-50 wt%.
Further, in the step (1), sulfuric acid is used to adjust the pH value.
Further, in the step (3), the ore pulp obtained in the step (2) sequentially enters a flotation machine, a thickener and a filter press to be subjected to solid-liquid separation. Wherein, the flotation process adopts one coarse and one fine sweeping.
Wherein, the filter liquor obtained after filter pressing can be returned to the pretreatment procedure to be used as water for size mixing.
Further, the cyanidation tailings are produced by cyanidation gold extraction technology. Preferably, the invention is suitable for all-mud cyanidation tailings, sulphide ore cyanidation tailings or roasting cyanidation tailings.
The invention has the following beneficial effects:
according to the invention, through the cooperation of the main treating agent and the auxiliary treating agent, cyanide in the cyanidation tailings reacts with the main treating agent to generate the iron-cyanogen complex, foams are formed under the action of the auxiliary treating agent to float on the surface of the ore pulp, and then the foams are removed through flotation, so that the problem of separation of the solid iron-cyanogen complex from the ore pulp is effectively solved, the process is simplified, and the cyanogen removal efficiency is improved.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with examples, which are included to illustrate the invention and not to limit the scope of the invention. The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
In each example, the total cyanide content was measured by the method of HJ745-2015, spectrophotometry for soil cyanide and total cyanide.
Example 1
The method for treating the direct cyanidation tailings of the gold concentrate has the total cyanogen content of 1273 mg/kg and comprises the following steps:
(1) Pretreatment: slurrying cyanidation tailings in a stirring tank by using water to reach the concentration of 20wt%, and adding sulfuric acid into the stirring tank to adjust the pH value to 4;
(2) Decyanation treatment: adding a main treating agent into the ore pulp obtained in the step (1) under the condition of normal temperature, and stirring for 60min; adding the auxiliary treating agent and stirring for 30min;
wherein: the main treating agent is sodium ferrate, and the dosage is 2kg/t calculated by the ore pulp obtained in the step (1); the secondary treating agent is a mixture of cobalt 2-ethylhexanoate, octadecylamine and isopropanol, and the dosage is 0.5kg/t calculated by the ore pulp obtained in the step (1); cobalt 2-ethylhexanoate: octadecylamine: the mass ratio of the isopropanol is 1;
(3) Flotation separation treatment: sequentially feeding the ore pulp obtained in the step (2) into a flotation machine, a thickener and a filter press for solid-liquid separation; wherein, the flotation adopts a one-coarse-one-fine two-sweeping process, the upper-layer product obtained by fine selection is subjected to pressure filtration to obtain solid cyanide, and the product obtained by scavenging is concentrated and subjected to pressure filtration to obtain detoxified tailings.
The detoxified tailings obtained after filter pressing have a total cyanogen content of 4.1mg/kg.
The above process flow can be referred to fig. 1.
Example 2
The method is used for treating all-mud cyanidation tailings, wherein the total cyanogen content is 453mg/kg, and the method comprises the following steps:
(1) Pretreatment: pulping cyanidation tailings in a stirring tank by using water to reach the concentration of 30wt%, and adding sulfuric acid into the stirring tank to adjust the pH value to 5;
(2) Decyanation treatment: adding a main treating agent into the ore pulp obtained in the step (1) under the condition of normal temperature, and stirring for 0.5h; adding the auxiliary treating agent and stirring for 0.1h;
wherein: the main treating agent is ferrous sulfate, and the dosage is 2kg/t calculated by the ore pulp obtained in the step (1); the secondary treating agent is a mixture of cobalt 2-ethylhexanoate, octadecylamine and isopropanol, and the dosage is 0.5kg/t calculated by the ore pulp obtained in the step (1); cobalt 2-ethylhexanoate: octadecylamine: the mass ratio of the isopropanol is 1;
(3) Flotation separation treatment: sequentially feeding the ore pulp obtained in the step (2) into a flotation machine, a thickener and a filter press for solid-liquid separation; wherein, the flotation adopts a coarse-fine two-sweep process, the upper-layer product obtained by fine selection is filtered and pressed to obtain solid cyanide, the scavenging is carried out to obtain the product which is dense, and the detoxified tailings are obtained after the filter pressing.
The total cyanogen content in the detoxified tailings obtained after filter pressing is 2.2mg/kg.
The above process flow can be referred to fig. 1.
Example 3
The roasting cyaniding tailings are treated, the total cyanogen content is 608mg/kg, and the steps are as follows:
(1) Pretreatment: slurrying cyanidation tailings in a stirring tank by using water to reach the concentration of 40wt%, and adding sulfuric acid into the stirring tank to adjust the pH value to 6;
(2) Decyanation treatment: adding a main treating agent into the ore pulp obtained in the step (1) under the normal temperature condition, and stirring for 1.5h; adding the auxiliary treating agent and stirring for 0.2h;
wherein: the main treating agent is EDDHA-Fe, EDTA-Fe and ferric acetate, the weight ratio is 1; the secondary treating agent is a mixture of cobalt 2-ethylhexanoate, octadecylamine and isopropanol, and the dosage is 0.7kg/t calculated by the ore pulp obtained in the step (1); cobalt 2-ethylhexanoate: octadecylamine: the mass ratio of the isopropanol is 1;
(3) Flotation separation treatment: sequentially feeding the ore pulp obtained in the step (2) into a flotation machine, a thickener and a filter press for solid-liquid separation; wherein, the flotation adopts a coarse-fine two-sweep process, the upper-layer product obtained by fine selection is filtered and pressed to obtain solid cyanide, the scavenging is carried out to obtain the product which is dense, and the detoxified tailings are obtained after the filter pressing.
The detoxified tailings obtained after filter pressing have a total cyanogen content of 0.95mg/kg.
The above process flow can refer to fig. 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (10)
1. A cyanide removal treatment method for cyanide tailings is characterized by comprising the following steps:
(1) Pretreatment: pulping cyaniding tailings by using water, and adjusting the pH value to 4-6;
(2) Decyanation treatment: adding a main treating agent into the ore pulp obtained in the step (1), and reacting for 0.1 to 2h; adding a secondary treating agent, and reacting for 0.1 to 1h;
wherein the main treating agent is one or more than two of sodium ferrate, ferrous sulfate, ferric sulfate, EDDHA-Fe, EDTA-Fe and ferric acetate;
wherein the secondary treating agent is a mixture comprising cobalt 2-ethylhexanoate, octadecylamine and isopropanol;
(3) And (5) flotation separation treatment.
2. The cyanide tailings cyanide removal treatment method according to claim 1, wherein in the secondary treatment agent in step (2), the ratio of cobalt 2-ethylhexanoate: octadecylamine: the mass ratio of the isopropanol is 1 (1.5-10) to (30-55).
3. The cyanide tailings cyanide removal process of claim 2, wherein the amount of the secondary treatment agent is 0.2 to 1kg/t based on the pulp obtained in step (1).
4. The cyanide tailings cyanide removal treatment method according to any one of claims 1 to 3, wherein in the step (2), the amount of the main treatment agent is 0.5 to 3kg/t based on the ore pulp obtained in the step (1).
5. The cyanide tailings cyanide removal treatment method according to any one of claims 1 to 3, wherein the slurry mixing concentration in the step (1) is 10wt% to 50wt%.
6. The cyanide tailings cyanide removal process of any of claims 1 to 3, wherein in step (1), the pH is adjusted using sulfuric acid.
7. The cyanide tailings cyanide removal processing method according to any of claims 1 to 3, wherein in the step (3), the ore pulp obtained in the step (2) sequentially enters a flotation machine, a thickener and a filter press to be subjected to solid-liquid separation.
8. The cyanide tailings cyanide removal process of claim 7, wherein in step (3), flotation process uses one coarse and one fine sweep.
9. The cyanide tailings cyanide removal processing method according to any one of claims 1 to 3, wherein the cyanide tailings are cyanide tailings generated by a cyanide gold extraction process.
10. The cyanide-removal treatment method of cyanidation tailings of claim 9, characterized in that the cyanidation tailings are all-mud cyanidation tailings, gold concentrate direct cyanidation tailings or roasted cyanidation tailings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211467151.9A CN115888970A (en) | 2022-11-22 | 2022-11-22 | Cyanide removal treatment method for cyanidation tailings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211467151.9A CN115888970A (en) | 2022-11-22 | 2022-11-22 | Cyanide removal treatment method for cyanidation tailings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115888970A true CN115888970A (en) | 2023-04-04 |
Family
ID=86483631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211467151.9A Pending CN115888970A (en) | 2022-11-22 | 2022-11-22 | Cyanide removal treatment method for cyanidation tailings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115888970A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116900035A (en) * | 2023-07-28 | 2023-10-20 | 招远中环科技有限公司 | Deep desulfurization method for high-silicon tailings |
-
2022
- 2022-11-22 CN CN202211467151.9A patent/CN115888970A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116900035A (en) * | 2023-07-28 | 2023-10-20 | 招远中环科技有限公司 | Deep desulfurization method for high-silicon tailings |
| CN116900035B (en) * | 2023-07-28 | 2024-04-09 | 招远中环科技有限公司 | Deep desulfurization method for high-silicon tailings |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102703696B (en) | Method for recovering valuable metal from red soil nickel minerals comprehensively | |
| CN102784713B (en) | Method for recycling multiple elements of liquid after cyanided tailing flotation | |
| CN107034359B (en) | A method of it is recycled using cyanide wastewater and neutralizes valuable metal in waste residue | |
| CN105296744A (en) | Method for laterite-nickel ore resourceful treatment and comprehensive recycling | |
| CN109621276A (en) | A kind of method that richness iron copper ashes handles arsenic in nonferrous smelting waste acid | |
| CN111270071A (en) | Method for recovering gold from gold-containing pregnant solution | |
| CN107574302A (en) | A kind of processing method and cyaniding gold-extracting method of cyanidation gold-extracted lean solution | |
| CN111826523B (en) | Method for refining nickel hydroxide cobalt | |
| CN115888970A (en) | Cyanide removal treatment method for cyanidation tailings | |
| CN109590107B (en) | Process for recovering sulfur and valuable metals from copper oxygen pressure leaching slag | |
| CN103667695A (en) | Method for extracting arsenic from gold ore | |
| CN108866337B (en) | A method of processing metal sludge | |
| CN108862370A (en) | A method of nano zine oxide being produced under zinc ammonia complexing environment using containing zinc ore crude | |
| CN107952577B (en) | Difficulty selects cyanidation tailings preprocess method | |
| CN113234941B (en) | High-value utilization method of electrolytic manganese anode slime | |
| CN111411224B (en) | Beneficiation method for comprehensively recovering and combining silver and copper from low-grade manganese-containing ore | |
| CN107604177B (en) | Method for leaching arsenic-containing gold concentrate and treating leachate of arsenic-containing gold concentrate | |
| CN110550664B (en) | Method for preparing iron oxide red by roasting cyanide tailings containing arsenic | |
| CN108996752B (en) | Method for recovering low-concentration nickel from nickel extraction waste water | |
| CN111961869A (en) | Non-ferrous smelting waste recovery system and use method thereof | |
| CN111926189A (en) | Method for recovering zinc from high-acid zinc dipping slag | |
| CN111100991A (en) | Treatment method of nickel wet refining tailings based on high-temperature oxygen pressure | |
| CN110184459A (en) | A method of basic copper chloride is produced using copper-contained sludge | |
| CN110627106A (en) | Method for producing zinc carbonate by using blast furnace cloth bag ash dechlorination wastewater | |
| CN116251325B (en) | Degradation method of thiocyanate radical in cyanidation tailings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |