CN101386454B - Zn-containing cyanide barren solution three-step sedimentation processing technology - Google Patents
Zn-containing cyanide barren solution three-step sedimentation processing technology Download PDFInfo
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- CN101386454B CN101386454B CN2008100720172A CN200810072017A CN101386454B CN 101386454 B CN101386454 B CN 101386454B CN 2008100720172 A CN2008100720172 A CN 2008100720172A CN 200810072017 A CN200810072017 A CN 200810072017A CN 101386454 B CN101386454 B CN 101386454B
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Abstract
The invention relates to a three-step sedimentation processing technology of a cyanidation barren solution containing zinc, wherein, a dezincification reaction sedimentation procedure is added between acidification reaction sedimentation and neutralization reaction sedimentation, namely, lime is firstly added to a clear solution reaction tank containing one-step deposited clear solution for carrying out the dezincification reaction and the pH value is adjusted to be 5.50 to 6.50, and then the clear solution added with the lime is deposited in a sedimentation tank so as to ensure that Zn<2+> in the solution is deposited in the forms of Zn(CN) 2 and Zn(OH)2, and then solid-liquid separation is carried out. Sediment and cyanidation tailings are processed together and the solution is subsequently processed. The technology of the invention is characterized by high removal rates of Cu, Fe and Zn, low processing costs, small investment, simple technology and the like; since the processed cyanide barren solution can be returned for use through cyanidation and extraction, the extraction ratios of Au and Ag are respectively improved, thereby being applicable to processing cyanidation barren solution containing zinc in the industry of gold.
Description
One. technical field
The present invention relates to a kind of cyanide wastewater treatment process, especially a kind of Zn-containing cyanide barren solution three-step sedimentation processing technology is particularly suitable for gold industry Zn-containing cyanide barren solution and handles application.
Two. background technology
Full mud or refined gold ore cyaniding leaching-zinc dust precipitation are carried in the gold production, and the cyanide barren solution that is produced mainly contains heavy metal cyano complexs such as copper, iron, zinc.Do not efflux for making cyanide barren solution all return use, at present, cyanide barren solution mostly adopts acidifying-neutralisation, claims the two step precipitator method again) handle.The two step precipitator method mainly comprise acid precipitation, neutralization precipitation process.Its sulfuric acid acidation and lime neutralization precipitation optimal ph are controlled at respectively between 1.5～2.5,9.5～10.5.Adopt this method to handle Zn-containing cyanide barren solution, can remove part foreign ion in the cyanide barren solution, reclaim cyanogen root and part valuable metal simultaneously.But the shortcoming of this technology maximum is the zine ion that can't effectively remove in the cyanide barren solution, cause in the cyanide barren solution zine ion constantly to be accumulated, reuse is produced the cyaniding that will influence gold and silver and is leached, this method is representative with Chinese patent publication number: CN1250031A disclosed " process for treatment of waste water containing cyanogen by acidifying precipitation method ", is similar with Chinese patent publication number: CN1144194A disclosed " lean cyanided ore liquid impurity eliminating technology " in addition.
The two-step precipitation method is to handle the main recovery method of cyanide barren solution at present both at home and abroad, yet its inherent shortcoming has restricted the development of Zn-containing cyanide barren solution zero release in the gold production process.
Therefore, be badly in need of seeking the Zn-containing cyanide barren solution comprehensive processing technique that a kind of processing cost is low, simple to operate, environmental benefit is good.
Three. summary of the invention
The object of the present invention is to provide a kind of Zn-containing cyanide barren solution three-step sedimentation processing technology, it is acidifying-dezincification-neutralization, be called for short the processing Zn-containing cyanide barren solution technology of three-step precipitation method, it can make cyanide barren solution be recycled, and can realize the zero release of Zn-containing cyanide barren solution again.
For finishing this task, the present invention carries out in the following way:
Zn-containing cyanide barren solution three-step sedimentation processing technology of the present invention is to increase dezincification reaction precipitation operation between acidification reaction precipitation and neutralization reaction precipitation operation, and this method comprises following processing steps in sequence and condition:
(a) a step precipitation, earlier pour the vitriol oil into and carry out acidification reaction to the acid mixing device that fills Zn-containing cyanide barren solution acid, regulator solution pH value to 1.50～3.00 add 0.5～2mL1, ‰ PAM after the acidifying, make the formation of metal ion such as Cu, Fe CuCN, CuSCN, Zn in the Zn-containing cyanide barren solution
2Fe (CN)
6Deng the indissoluble throw out, carry out the underflow solid-liquid separation then, throw out then with the copper mineral form to the smeltery, solution is through subsequent disposal;
(b) two-step precipitation earlier adds the lime reaction that dezincifies to the clear liquid reaction tank that fills sedimentary clear liquid of a step, regulates pH value to 5.50～6.50, and the clear liquid of adding lime is precipitated in settling bowl, makes Zn in the solution
2+With Zn (CN)
2, Zn (OH)
2Precipitation is carried out solid-liquid separation then, and throw out and cyanidation tailings are handled together, and solution is through subsequent disposal;
(c) three-step precipitation adds lime to the neutralization reaction pond of the clear liquid that fills two-step precipitation earlier and carries out neutralization reaction, regulates pH value 10.00～13.00, makes SO in the solution
4 2-Generate CaSO
4Precipitation, prussiate is with CN
-Form exists in the solution, carries out solid-liquid separation then, and throw out is then handled together with cyanidation tailings, and solution returns to produce and is used for the cyaniding leaching.
Zn-containing cyanide barren solution three-step sedimentation processing technology of the present invention further comprises:
Can be used as the dezincify lime of agent of the present invention is the production domesticization raw material easily purchased of market and cheap.
Advantage of the present invention:
1.Cu, Fe, Zn clearance height.
2. handle the back cyanide barren solution and can return cyaniding leaching use, processing cost is low.
3.Au, the Ag leaching yield also is improved respectively.
4. less investment, technology are simple.
Four. description of drawings
The concrete grammar of invention is provided by the following drawings.
Fig. 1 is known cyanide barren solution two step sedimentation processing technology schemas.
Fig. 2 is a kind of Zn-containing cyanide barren solution three-step sedimentation processing technology schema that proposes according to the present invention.
Each sign expression in the accompanying drawing:
PAM is a polyacrylamide
The present invention is described in further detail below in conjunction with accompanying drawing.
Five. embodiment
With reference to Fig. 1, known cyanide barren solution two step sedimentation processing technologies are one step of acidification reaction precipitation and neutralization reaction two-step precipitation, and its sulfuric acid acidation and lime neutralization precipitation optimal ph are controlled at respectively between 1.5～2.5,9.5～10.5.Adopt this method to handle Zn-containing cyanide barren solution, can remove part foreign ion in the cyanide barren solution, reclaim cyanogen root and part valuable metal simultaneously.
As shown in Figure 2, a kind of Zn-containing cyanide barren solution three-step sedimentation processing technology is to increase dezincification reaction precipitation operation between acidification reaction precipitation and neutralization reaction precipitation operation, and this method comprises following processing steps in sequence and condition:
(a) a step precipitation, earlier pour the vitriol oil into and carry out acidification reaction to the acid mixing device that fills Zn-containing cyanide barren solution acid, regulator solution pH value to 1.50～3.00 add 0.5～2mL1, ‰ PAM after the acidifying, make the formation of metal ion such as Cu, Fe CuCN, CuSCN, Zn in the Zn-containing cyanide barren solution
2Fe (CN)
6Deng the indissoluble throw out, carry out the underflow solid-liquid separation then, throw out then with the copper mineral form to the smeltery, solution is through subsequent disposal;
(b) two-step precipitation earlier adds the lime reaction that dezincifies to the clear liquid reaction tank that fills sedimentary clear liquid of a step, regulates pH value to 5.50～6.50, and the clear liquid of adding lime is precipitated in settling bowl, makes Zn in the solution
2+With Zn (CN)
2, Zn (OH)
2Precipitation is carried out solid-liquid separation then, and throw out and cyanidation tailings are handled together, and solution is through subsequent disposal;
(c) three-step precipitation adds lime to the neutralization reaction pond of the clear liquid that fills two-step precipitation earlier and carries out neutralization reaction, regulates pH value 10.00～13.00, makes SO in the solution
4 2-Generate CaSO
4Precipitation, prussiate is with CN
-Form exists in the solution, carries out solid-liquid separation then, and throw out is then handled together with cyanidation tailings, and solution returns to produce and is used for the cyaniding leaching.
Described Zn-containing cyanide barren solution three-step sedimentation processing technology comprises that further it is 20～40min that described per step precipitation time of repose is.
Test analysis method of the present invention:
(1) Au adopts foam absorption-atomic absorption spectroscopy determination, Cu, Zn adopt atomic absorption spectrophotometry (GB/T7475-1987) to measure, Ag adopts atomic absorption spectrophotometry (GB/T11907-1989) to measure, and Fe adopts atomic absorption spectrophotometry (GB/T11911-1989) to measure.
(2) prussiate analytical procedure: H
3PO
4With EDTA disodium fore-distillation, silver nitrate titration method (GB/T7486-87);
Test materials of the present invention:
The accurate pH meter of pHS-3C, the technical grade vitriol oil, lime.
Testing sequence of the present invention:
Measure the 1000ml Zn-containing cyanide barren solution, agitation condition adds the dense H of 4.5～5.5ml down
2SO
4Acidifying 5～20min, control acidifying pH value to 1.50～2.50 add 0.5～2mL1, ‰ PAM after the acidifying, leave standstill 20～40min, solid-liquid separation.Gained solution is regulated pH value to 5.00～7.00 with lime earlier, leaves standstill 20～40min, solid-liquid separation then.Gained solution with lime regulator solution pH value to 10.00～13.00, leaves standstill 20～40min, solid-liquid separation earlier then, at last clear liquid is returned the cyaniding leaching test.
Embodiment one
Get certain gold mine Zn-containing cyanide barren solution, handle Cu, Fe, Zn concentration (mgL in the preceding Zn-containing cyanide barren solution
-1) be respectively 990.03,5.20,1511.28.Adopt the inventive method and two-step precipitation method to handle respectively, and the cyanide barren solution after will handling returns the cyaniding leaching respectively, measurement result sees Table 1, table 2.
Table 1 the inventive method and known two-step precipitation method are handled the cyanide barren solution test-results
Comparative test result (by slag) is leached in table 2 cyaniding
Embodiment two
Get another gold mine Zn-containing cyanide barren solution, handle Cu, Fe, Zn concentration (mgL in the preceding Zn-containing cyanide barren solution
-1) be respectively 1412.56,7.53,1872.23.Adopt three the inventive method and two-step precipitation method to handle respectively, measurement result sees the following form 3, table 4.
Table 3 the inventive method and known two-step precipitation method are handled the cyanide barren solution test-results
Comparative test result (by slag) is leached in table 4 cyaniding
Can find out that from table 1～4 adopt the inventive method to handle Zn-containing cyanide barren solution, Cu, Fe, Zn clearance reach 99.14～99.32%, 89.81～92.03%, 95.29% respectively; Handle back cyanide barren solution reuse cyaniding and leach than two-step precipitation method processing reuse, Au, Ag leaching yield improve 0.57%, 9.93% respectively, reach 89.27%, 65.96%.
Claims (2)
1. a Zn-containing cyanide barren solution three-step sedimentation processing technology is to increase dezincification reaction precipitation operation between acidification reaction precipitation and neutralization reaction precipitation operation, and this technology comprises following processing steps in sequence and condition:
(a) a step precipitation, earlier pour the vitriol oil into and carry out acidification reaction to the acid mixing device that fills Zn-containing cyanide barren solution acid, regulator solution pH value to 1.50～3.00 add 0.5～2mL1, ‰ PAM after the acidifying, precipitation leaves standstill and makes Cu in the Zn-containing cyanide barren solution, Fe metal ion form CuCN, CuSCN, Zn
2Fe (CN)
6The indissoluble throw out carries out the underflow solid-liquid separation then, throw out then with the copper mineral form to the smeltery, one the step sedimentary clear liquid through subsequent disposal;
(b) two-step precipitation earlier adds the lime reaction that dezincifies to filling sedimentary clear liquid reaction tank of a step, regulates pH value to 5.50～6.50, and the clear liquid of adding lime is precipitated in settling bowl, precipitates to leave standstill to make Zn in the solution
2+Form Zn (CN)
2, Zn (OH)
2Precipitation is carried out solid-liquid separation then, and throw out and cyanidation tailings are handled together, and the clear liquid of two-step precipitation is through subsequent disposal;
(c) three-step precipitation adds lime to the neutralization reaction pond of the clear liquid that fills two-step precipitation earlier and carries out neutralization reaction, regulates pH value to 10.00～13.00, and precipitation leaves standstill and makes SO in the solution
4 2-Generate CaSO
4Precipitation, prussiate is with CN
-Form exists in the solution, carries out solid-liquid separation then, and throw out is then handled together with cyanidation tailings, and solution returns to produce and is used for the cyaniding leaching.
2. Zn-containing cyanide barren solution three-step sedimentation processing technology according to claim 1 comprises that further described per step precipitation time of repose is 20～40min.
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| CN111111086B (en) * | 2019-12-24 | 2021-06-11 | 东北大学 | Treatment method of cyanide-containing barren solution precipitation slag |
| CN115465970A (en) * | 2022-09-27 | 2022-12-13 | 江西江铜银珠山矿业有限公司 | Production process for degrading zinc content in wastewater by comprehensively stirring lime and zinc-containing wastewater |
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