CN105000720A - Method for treating cyaniding tailing slurry in gold smelting industry - Google Patents

Method for treating cyaniding tailing slurry in gold smelting industry Download PDF

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Publication number
CN105000720A
CN105000720A CN201510518495.1A CN201510518495A CN105000720A CN 105000720 A CN105000720 A CN 105000720A CN 201510518495 A CN201510518495 A CN 201510518495A CN 105000720 A CN105000720 A CN 105000720A
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China
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tailing slurry
cyaniding tailing
flue gas
dosage
index request
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CN201510518495.1A
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Chinese (zh)
Inventor
兰馨辉
迟崇哲
丁成
邱陆明
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Changchun Gold Research Institute
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Changchun Gold Research Institute
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Priority to CN201510518495.1A priority Critical patent/CN105000720A/en
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Abstract

The invention discloses a method for treating cyaniding tailing slurry in a gold smelting industry. According to the method, aiming at the characteristics that lots of SO2 gas and cyaniding tailing slurry can be produced in the gold smelting industry, the cyaniding tailing slurry contains various pollutants such as cyanides and heavy metal, particularly, the cyanides also comprise intractable metal cyanide complexes such as iron-cyanide complexes, firstly, adding cupric sulfate and hydrogen peroxide into the cyaniding tailing slurry, introducing SO2 flue gas and air simultaneously, and removing easy-to-release cyanides, part of iron-cyanide complexes and part of heavy metal in the cyaniding tailing slurry; secondly, adding zinc salt into the treated cyaniding tailing slurry to remove the remaining iron-cyanide complexes and heavy metal; finally, introducing SO2 flue gas and air into the cyaniding tailing slurry for oxidation to remove residual cyanides in the slurry, wherein in the whole reaction process, the pH condition of the cyaniding tailing slurry is controlled through lime slurry or sodium hydroxide. The method is high in treatment effect, high in treatment efficiency, stable in system operation and simple in technological process, and facilitates the realization of industrial application.

Description

A kind of gold smelting industry cyaniding tailing slurry treatment process
Technical field
The present invention relates to field of Environment Protection Pollutant Treatment method, particularly a kind for the treatment of process of gold smelting industry cyaniding tailing slurry.
Background technology
In the evolution of golden production, the widespread use of cyanidation gold-extracted technology serves critical effect.Owing to using Cyanide Process, can produce a large amount of cyaniding tailing slurries, this part cyaniding tailing slurry is not only containing a certain amount of hypertoxic prussiate, but also the heavy metal ion containing copper, zinc, lead and so on, if can not get effective process, great environmental protection hidden danger will be produced.The sinter process that gold smelting enterprise uses simultaneously can produce a large amount of SO 2flue gas, if can not get effectively administering the atmospheric environment that can have a strong impact on periphery.At present, the common method of gold smelting industry process cyaniding tailing slurry has acidifying absorption method, Pomolio-Celdecor process etc., although adopt acidifying absorption method can reclaim a certain amount of prussiate, but because recovery of cyanide is not thorough, the remaining a certain amount of prussiate of meeting in ore pulp, and some heavy metal ion are not all effectively removed.Can remaining a large amount of chlorine residue after Pomolio-Celdecor process process, produce ClCN product, cause secondary pollution problem, the heavy metal ion such as the copper in ore pulp, zinc, lead fail effectively to be administered, and liquid chlorine etc. has very large environmental risk.And these methods all can produce a large amount of SO less than for gold smelting enterprise 2the feature of flue gas, can not effectively reduce the processing cost of cyaniding tailing slurry.Therefore, also still lacking more satisfactory method in the cyaniding tailing slurry process of gold smelting enterprise, if resolve this problem, will important meaning had to development China's golden production and environmental protection development.
Summary of the invention
Object of the present invention is exactly the problems referred to above existed for the existing treatment process of gold smelting enterprise cyaniding tailing slurry, and provides the cyaniding tailing slurry treatment process that a kind of technical process is simple, treatment effect good, processing efficiency is high, stable.
The present invention can produce a large amount of SO according to gold smelting industry 2also comprise unmanageable metal top cradle containing in the feature, particularly prussiate of the multiple pollutant such as prussiate and heavy metal in flue gas, cyaniding tailing slurry, as iron cyano complex etc., in cyaniding tailing slurry, first add copper sulfate and hydrogen peroxide, pass into SO simultaneously 2flue gas and air, remove easy release prussiate, part iron cyano complex and the part heavy metal in cyaniding tailing slurry; Cyaniding tailing slurry after process is by adding zinc salt to remove remaining iron cyano complex and heavy metal; Finally in cyaniding tailing slurry, pass into SO again 2flue gas and air are oxidized, and are got rid of by prussiate remaining in ore pulp; Whole reaction process uses milk of lime or sodium hydroxide to control cyaniding tailing slurry pH condition.
The present invention includes following steps:
(1) under whipped state, in cyaniding tailing slurry, add copper sulfate and hydrogen peroxide reagent, pass into SO simultaneously 2flue gas and air, in reaction process, adjust ph is at 8-10, and the reaction times is 30min ~ 60min;
(2) reacted ore pulp adds zinc salt reagent successively under whipped state, and in reaction process, adjust ph is 8-10, and the reaction times is 20min ~ 40min;
(3) reacted ore pulp passes into SO under whipped state 2flue gas and air, in reaction process, adjust ph is 8.0-10, and the reaction times is 15min ~ 30min;
(4) cyaniding tailing slurry after process carries out press filtration, and filtrate returns in the technological process of production or qualified discharge, and mine tailings reach Ordinary solid waste I class standard.
In described step (1), stirring linear velocity is 0.01m/s ~ 10m/s; Copper sulfate is as catalyzer, and the copper in cyaniding tailing slurry can some or all of replacement copper sulfate, if copper ion concentration can not add copper sulfate higher than during 50mg/L in cyaniding tailing slurry; Hydrogen peroxide reagent is the hydrogen peroxide solution of mass percent concentration 30%, hydrogen peroxide reagent and SO 2the dosage of flue gas is how many and process index request and determine according to the cyanide content in ore pulp, cyanide content is high, process index request sternly, hydrogen peroxide reagent and SO 2the dosage of flue gas is corresponding to be increased, otherwise cyanide content is low, process index request pine, hydrogen peroxide reagent and SO 2the corresponding minimizing of dosage of flue gas; SO 2amount and air ratio are 1:50 ~ 150, and the vapour-liquid ratio that air passes into is 10 ~ 50:1; Acid-base reagent is milk of lime or sodium hydroxide.
In described step (2), stirring linear velocity is 0.01m/s ~ 10m/s; Acid-base modifier is milk of lime or sodium hydroxide; Zinc salt reagent is zinc sulfate or zinc nitrate, the dosage of zinc salt reagent is how many and process index request and determining according to the iron cyano complex content in ore pulp, iron cyano complex content is high, process index request is tight, the dosage of zinc salt reagent is corresponding to be increased, otherwise, iron cyano complex content is low, process index request pine, the corresponding minimizing of dosage of zinc salt reagent.
In described step (3), stirring linear velocity is 0.01m/s ~ 10m/s; Acid-base modifier is milk of lime or sodium hydroxide; SO 2the dosage of flue gas is how many and process index request and determine according to the cyanide content in ore pulp, cyanide content is high, process index request sternly, SO 2the dosage of flue gas is corresponding to be increased, otherwise cyanide content is low, process index request pine, SO 2the corresponding minimizing of dosage of flue gas; SO 2amount and air ratio are 1:50 ~ 150, and the vapour-liquid ratio that air passes into is 10 ~ 50:1.
Beneficial effect of the present invention:
The present invention can produce a large amount of SO according to gold smelting industry 2feature containing the multiple pollutant such as prussiate and heavy metal in flue gas, cyaniding tailing slurry, by SO 2air oxidation process, peroxide passivation and coagulant sedimentation combine, work in coordination with and advanced treatment is carried out to gold smelting industry cyaniding tailing slurry, treatment effect is good, processing efficiency is high, system run all right, technical process is simple, be convenient to realize industrial application, the waste water after process can return the technological process of production and use or qualified discharge as reuse water, and cyaniding tailing slag reaches Ordinary solid waste standard.
Embodiment
The present invention includes following steps:
(1) under whipped state, in cyaniding tailing slurry, add copper sulfate and hydrogen peroxide reagent, pass into SO simultaneously 2flue gas and air, in reaction process, adjust ph is at 8-10, and the reaction times is 30min ~ 60min;
(2) reacted ore pulp adds zinc salt reagent successively under whipped state, and in reaction process, pH value is 8-10, and the reaction times is 20min ~ 40min;
(3) reacted ore pulp passes into SO under whipped state 2flue gas and air, in reaction process, adjust ph is 8.0-10, and the reaction times is 15min ~ 30min;
(4) cyaniding tailing slurry after process carries out press filtration, and filtrate returns in the technological process of production or qualified discharge, and mine tailings reach Ordinary solid waste I class standard.
In described step (1), stirring linear velocity is 0.01m/s ~ 10m/s; Copper sulfate is as catalyzer, and the copper in cyaniding tailing slurry can some or all of replacement copper sulfate, if copper ion concentration can not add copper sulfate higher than during 50mg/L in cyaniding tailing slurry; Hydrogen peroxide reagent is the hydrogen peroxide solution of mass percent concentration 30%, hydrogen peroxide reagent and SO 2the dosage of flue gas is how many and process index request and determine according to the cyanide content in ore pulp, cyanide content is high, process index request sternly, hydrogen peroxide reagent and SO 2the dosage of flue gas is corresponding to be increased, otherwise cyanide content is low, process index request pine, hydrogen peroxide reagent and SO 2the corresponding minimizing of dosage of flue gas; SO 2amount and air ratio are 1:50 ~ 150, and the vapour-liquid ratio that air passes into is 10 ~ 50:1; PH value regulator is milk of lime or sodium hydroxide.
In described step (2), stirring linear velocity is 0.01m/s ~ 10m/s; PH value regulator is milk of lime or sodium hydroxide; Zinc salt reagent is zinc sulfate or zinc nitrate, the dosage of zinc salt reagent is how many and process index request and determining according to the iron cyano complex content in ore pulp, iron cyano complex content is high, process index request is tight, the dosage of zinc salt reagent is corresponding to be increased, otherwise, iron cyano complex content is low, process index request pine, the corresponding minimizing of dosage of zinc salt reagent.
In described step (3), stirring linear velocity is 0.01m/s ~ 10m/s; PH value regulator is milk of lime or sodium hydroxide; SO 2the dosage of flue gas is how many and process index request and determine according to the cyanide content in ore pulp, cyanide content is high, process index request sternly, SO 2the dosage of flue gas is corresponding to be increased, otherwise cyanide content is low, process index request pine, SO 2the corresponding minimizing of dosage of flue gas; SO 2amount and air ratio are 1:50 ~ 150, and the vapour-liquid ratio that air passes into is 10 ~ 50:1.
Specific examples 1:
Certain gold smelting enterprise cyaniding tailing slurry, pH is 10.8, CN tbe 12.13mg/L for 1113.47mg/L, Fe be 62.56mg/L, Cu are 387.25mg/L, Pb, other heavy metal ion in addition containing trace.Get 3L cyaniding tailing slurry be placed in aeration/stirring system is housed reactive tank in, open stirring system, SO 2amount is set to 4L/h, and air capacity is 200L/h, adds the hydrogen peroxide 30mL/L of concentration 30%, and concentration is that 10% sodium hydroxide solution adds speed and is set to 80ml/h, reaction times 60min; Then zinc sulfate 4g stirs 30min; And then SO is passed in cyaniding tailing slurry 2flue gas and air, SO 2amount is set to 1L/h, and air capacity is 60L/h.The water outlet of cyaniding tailing slurry after system process through assay pH between 7 ~ 9, CN t< 0.2mg/L, Cu < 0.5mg/L, Pb < 0.5mg/L, first kind pollutent is all within the highest permission emission concentration limit value, after process, water quality can reach reuse or emission standard, and cyanogen-containing tailing slag reaches Ordinary solid waste standard.
Specific examples 2:
Certain gold mining enterprises cyaniding tailing slurry, pH is 8.5, CN tbe 15.45mg/L for 479.58mg/L, Fe be 26.39mg/L, Zn are 24.25mg/L, Cu, other heavy metal ion in addition containing trace.Get 3L cyaniding tailing slurry be placed in aeration/stirring system is housed reactive tank in, open stirring system, SO 2amount is set to 2L/h, and air capacity is 100L/h, adds the hydrogen peroxide 15mL/L of concentration 30%, adds copper sulfate 0.5g/L, and concentration is that 10% sodium hydroxide solution adds speed and is set to 40ml/h, reaction times 30min; Then zinc sulfate 2.5g stirs 30min; And then SO is passed in cyaniding tailing slurry 2flue gas and air, SO 2amount is set to 1L/h, and air capacity is 60L/h.The water outlet of cyaniding tailing slurry after system process through assay pH between 7 ~ 9, CN t< 0.2mg/L, Cu 2+< 0.5mg/L, Pb < 0.5mg/L, first kind pollutent is all within the highest permission emission concentration limit value, and after process, water quality can reach reuse or emission standard, and cyanogen-containing tailing slag reaches Ordinary solid waste standard.

Claims (4)

1. a treatment process for gold smelting industry cyaniding tailing slurry, the method comprises the following steps:
(1) under whipped state, in cyaniding tailing slurry, add copper sulfate and hydrogen peroxide reagent, pass into SO simultaneously 2flue gas and air, in reaction process, adjust ph is at 8-10, and the reaction times is 30min ~ 60min;
(2) reacted ore pulp adds zinc salt reagent successively under whipped state, and in reaction process, adjust ph is 8-10, and the reaction times is 20min ~ 40min;
(3) reacted ore pulp passes into SO under whipped state 2flue gas and air, in reaction process, adjust ph is 8.0-10, and the reaction times is 15min ~ 30min;
(4) cyaniding tailing slurry after process carries out press filtration, and filtrate returns in the technological process of production or qualified discharge, and mine tailings reach Ordinary solid waste I class standard.
2. the treatment process of a kind of gold smelting industry cyaniding tailing slurry according to claim 1, it is characterized in that: in described step (1), stirring linear velocity is 0.01m/s ~ 10m/s; Copper sulfate is as catalyzer, and the copper in cyaniding tailing slurry can some or all of replacement copper sulfate, if copper ion concentration can not add copper sulfate higher than during 50mg/L in cyaniding tailing slurry; Hydrogen peroxide reagent is the hydrogen peroxide solution of mass percent concentration 30%, hydrogen peroxide reagent and SO 2the dosage of flue gas is how many and process index request and determine according to the cyanide content in ore pulp, cyanide content is high, process index request sternly, hydrogen peroxide reagent and SO 2the dosage of flue gas is corresponding to be increased, otherwise cyanide content is low, process index request pine, hydrogen peroxide reagent and SO 2the corresponding minimizing of dosage of flue gas; SO 2amount and air ratio are 1:50 ~ 150, and the vapour-liquid ratio that air passes into is 10 ~ 50:1; PH value regulator is milk of lime or sodium hydroxide.
3. the treatment process of a kind of gold smelting industry cyaniding tailing slurry according to claim 1, it is characterized in that: in described step (2), stirring linear velocity is 0.01m/s ~ 10m/s; PH value regulator is milk of lime or sodium hydroxide; Zinc salt reagent is zinc sulfate or zinc nitrate, the dosage of zinc salt reagent is how many and process index request and determining according to the iron cyano complex content in ore pulp, iron cyano complex content is high, process index request is tight, the dosage of zinc salt reagent is corresponding to be increased, otherwise, iron cyano complex content is low, process index request pine, the corresponding minimizing of dosage of zinc salt reagent.
4. the treatment process of a kind of gold smelting industry cyaniding tailing slurry according to claim 1, it is characterized in that: in described step (3), stirring linear velocity is 0.01m/s ~ 10m/s; PH value regulator is milk of lime or sodium hydroxide; SO 2the dosage of flue gas is how many and process index request and determine according to the cyanide content in ore pulp, cyanide content is high, process index request sternly, SO 2the dosage of flue gas is corresponding to be increased, otherwise cyanide content is low, process index request pine, SO 2the corresponding minimizing of dosage of flue gas; SO 2amount and air ratio are 1:50 ~ 150, and the vapour-liquid ratio that air passes into is 10 ~ 50:1.
CN201510518495.1A 2015-08-23 2015-08-23 Method for treating cyaniding tailing slurry in gold smelting industry Pending CN105000720A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106269785A (en) * 2016-07-29 2017-01-04 山东国大黄金股份有限公司 A kind of method of baking cyaniding tailings clean conversion
CN108149027A (en) * 2017-12-08 2018-06-12 长春黄金研究院 A kind for the treatment of agent and take off processing method using the cyanogen-containing tailing wash heat of the medicament
CN108529722A (en) * 2018-04-09 2018-09-14 中南大学 A kind of method of biological oxidation, ferromagnetism absorption combined removal cyanide
CN109894458A (en) * 2019-03-27 2019-06-18 长春黄金研究院有限公司 A kind of method of raffinate and flue gas during smelting coordination with the synthesis improvement cyanidation tailings

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN87101217A (en) * 1987-12-31 1988-09-21 冶金工业部建筑研究总院 High cyanide containing wastewater with contain the useless smoke comprehensive improvement method of sulfur dioxide
US20130026102A1 (en) * 2010-05-24 2013-01-31 Safe Mines And Waterways, Llc Remediation system for transition metal ions and method for same
CN104071953A (en) * 2014-07-16 2014-10-01 长春黄金研究院 Cyanide-containing wastewater treating method for gold mine
CN104787933A (en) * 2015-05-05 2015-07-22 长沙华时捷环保科技发展有限公司 Treatment method for gold-smelting cyanide-containing wastewater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN87101217A (en) * 1987-12-31 1988-09-21 冶金工业部建筑研究总院 High cyanide containing wastewater with contain the useless smoke comprehensive improvement method of sulfur dioxide
US20130026102A1 (en) * 2010-05-24 2013-01-31 Safe Mines And Waterways, Llc Remediation system for transition metal ions and method for same
CN104071953A (en) * 2014-07-16 2014-10-01 长春黄金研究院 Cyanide-containing wastewater treating method for gold mine
CN104787933A (en) * 2015-05-05 2015-07-22 长沙华时捷环保科技发展有限公司 Treatment method for gold-smelting cyanide-containing wastewater

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106269785A (en) * 2016-07-29 2017-01-04 山东国大黄金股份有限公司 A kind of method of baking cyaniding tailings clean conversion
CN108149027A (en) * 2017-12-08 2018-06-12 长春黄金研究院 A kind for the treatment of agent and take off processing method using the cyanogen-containing tailing wash heat of the medicament
CN108529722A (en) * 2018-04-09 2018-09-14 中南大学 A kind of method of biological oxidation, ferromagnetism absorption combined removal cyanide
CN109894458A (en) * 2019-03-27 2019-06-18 长春黄金研究院有限公司 A kind of method of raffinate and flue gas during smelting coordination with the synthesis improvement cyanidation tailings
CN109894458B (en) * 2019-03-27 2022-03-11 长春黄金研究院有限公司 Method for comprehensively treating cyaniding tailings by synergy of raffinate and smelting flue gas

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