CN101033506B - Method of directly leaching zinc ore concentrate or low grade mixing zinc ore under normal pressure and alkaline condition - Google Patents
Method of directly leaching zinc ore concentrate or low grade mixing zinc ore under normal pressure and alkaline condition Download PDFInfo
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- CN101033506B CN101033506B CN2007100395754A CN200710039575A CN101033506B CN 101033506 B CN101033506 B CN 101033506B CN 2007100395754 A CN2007100395754 A CN 2007100395754A CN 200710039575 A CN200710039575 A CN 200710039575A CN 101033506 B CN101033506 B CN 101033506B
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- zinc
- leaching
- lead
- zinc ore
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- 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
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Abstract
The invention relates to a method for atmosphericically direct-leaching zinc concentrate or low grade mixed zinc ore. In the invention, it firstly smashes the zinc concentrate or low grade mixed zinc ore into 0.5~1mm, then it respectively measures materials as follow: raw material: activated medium = 1:(5~20), leaching reaction accelerator: zinc sulfide of the raw material = (1~2.5): 1, then it puts the materials into a stirred mill activated reactor for grinding and leaching for 60~120 minutes under the condition with an alkaline concentration of 2~8M, 70~100 deg.C and a stirring speed of 300~600 r/min. More than 80% of zinc in the raw material is dissolved and leached. After filtration, it processes the dregs with sodium carbonate into the reaction accelerator by recycling of lead, and then it is returned for leaching. The electrolytic extraction of leaching is returned for leaching after the extraction of zinc.
Description
Technical field
A kind of normal pressure alkalescence directly leaches the method for zinc ore concentrate or low-grade mixing zinc ore, relates to the method that a kind of zinc ore concentrate or low-grade mixing zinc ore are produced zinc powder.Belonging to non-ferrous metal reclaims and the reclamation of solid wastes field.
Background technology
Metallic zinc is widely used in alloy, industries such as casting, plating, dyeing industry, pharmaceutical sector, rubber industry and battery.Metallic zinc has become the requisite important meals material of national economy, because the popularity and the economy of its purposes, the turnout and the consumption of metallic zinc are constantly increased, statistics according to International Lead and Zine Study Group (ILZSG), zinc consumption average annual growth the in the whole world is that 2.7%, 2006 year year consumption zinc is 1106.4 ten thousand tons.
The acid technological process flow process that traditional metallic zinc is smelted is zink sulphide roasting-acidleach-removal of impurities-sour electrolysis.This technology because of need with the raw material roasting after acidleach, exist seriously polluted, investment is big, complex procedures, removal of impurities difficulty, electrolytic condition is harsh and to containing shortcomings such as zinc oxide ore and waste residue bad adaptability.With respect to traditional acid technological process; alkali process adopts alkaline solution leaching-removal of impurities-electrolytic method direct production metal zinc, has that flow process is simple, energy consumption is low, adaptability to raw material is strong, good product quality, helps superiority such as environment protection and comprehensive utilization of resources.But the zinc sulphide in zinc ore concentrate or the low-grade mixing zinc ore is because of its special chemical property, can not directly be dissolved under normal pressure in acidity or the alkaline medium, shortcomings such as traditional high pressure-temperature technology is big to material requirements height, cost because of existing, operational hazards are restricted its suitability.
Summary of the invention
The objective of the invention is to disclose the method that a kind of technology normal pressure alkalescence simple, with low cost directly leaches zinc ore concentrate or low-grade mixing zinc ore.
For reaching above purpose, the present invention is through discovering: under the condition that lead compound existence and mechanical activation are arranged, the zinc sulphide in zinc ore concentrate or the low-grade mixing zinc ore can be dissolved in the alkaline solution, and lead is converted into lead sulfide in leached mud.According to this rule, technology of the present invention adds lead-containing compounds as promotor in leaching process, carries out mechanical activation when leaching, thereby has realized the direct hydrometallurgy of normal pressure of zinc sulfide ore.
The present invention adopts following technology: at first, as raw material, be crushed to 0.5-1mm with zinc ore concentrate or low-grade mixing zinc ore; Then, raw material, strong alkali solution and leaching reaction promotor are added in the stirring mill activated reactor simultaneously, leach simultaneously at the grinding activatory.The alkali concn of strong alkali solution is 2～8M, measure raw material respectively: activated media is 1: (5～20) (mass ratio), leach reaction promotor: Containing Sulfur zinc is (1～2.5) in the raw material: 1 (mass ratio), 70～100 ℃ of extraction temperatures, stirring velocity 300～600r/min, under activation extraction time 60～120min condition, raw material is carried out the grinding machinery activation, leach reaction simultaneously.Leaching reaction promotor can perhaps also can mix above-mentioned lead-containing compounds by arbitrary proportion and use singly with lead sulfate or lead carbonate or plumbous oxide or lead nitrate or lead peroxide or tri-lead tetroxide.Stirring the mill activated reactor makes for the charcoal steel or stainless steel, activated media is corundum ball or Stainless Steel Ball, makes raw material and medium grind collision together by stirring in reactor, and existing levigate effect has activation again when leaching, increase the reaction contact surface, reduce reaction activity.Zinc in zinc ore concentrate or the low-grade mixing zinc ore is dissolved, zinc leaching rate is 80～90%, then through filtering, after making solid-liquid separation, leach liquor directly is circulated in next leaching flow process again after the methods such as electrolysis of routine are extracted metallic zinc, filter leached mud transform to reclaim wherein lead through sodium carbonate solution, the add-on of sodium carbonate is a yellow soda ash: the lead content in the leached mud is (1.5～2): 1 mass ratio, make the leaching reaction promotor and return the recycle of leaching operation again, the waste residue behind the conversion lead is used for brickmaking or landfill.
The principal reaction that the removal process plumbous in zinc sulphide and the leached mud that leaches alkaline solution takes place is as follows:
Na
2Pb(OH)
4(aq.)+ZnS(s)＝Na
2Zn(OH)
4(aq.)+PbS(s)
PbS(s)+Na
2CO
3(aq.)+2O
2(g)＝PbCO
3(s)+Na
2SO
4(aq.)
The present invention has following advantage:
1. because the present invention has adopted the leaded promotor and the mechanical activation mode of reusable edible, overcome zinc sulphide undissolvable substantially difficult problem in alkaline solution under the normal pressure, make the zinc sulphide composition major part in zinc ore concentrate or the low-grade mixing zinc ore be dissolvable in water alkaline solution, do not need high-temperature roasting and high-temperature and high-pressure conditions; And can be in conjunction with the direct electrolysis production metal zinc from leach liquor of alkaline process smelting process advantage, carry zinc after waste back-cycling leach recycle, realized the direct hydrometallurgy of normal pressure of zinc sulphide.
2. technology of the present invention can utilize low-grade mixing zinc ore, mine tailing or the Containing Sulfur zinc waste residue of zinc content more than 5% to be raw material, makes full use of waste resource, has good social benefit and economic benefit.
3. owing to waste residue in the technological process of the present invention can both utilize, the lead recycle after yellow soda ash transforms in the leaching slag after waste residue is used alkali lye and water washing after transforming, can be used for brickmaking or landfill.Through toxicity leaching test, transform the slag nontoxicity, can be used as Ordinary solid waste and handle, belong to process for cleanly preparing.
Description of drawings
Fig. 1 is a process flow sheet of the present invention
Embodiment
Embodiment 1
See also accompanying drawing 1.Producing zinc ore concentrate with Yunnan billows deep blue is raw material, its chemical ingredients such as table 1.
Table 1 billows deep blue zinc ore concentrate chemical ingredients
The above-mentioned zinc ore concentrate raw material pulverizing of 100g is arrived 0.5-1mm, join and stir in the mill reactor, adding 1-1.5L concentration simultaneously is the plumbiferous leaching reaction promotor of 2-8M industrial caustic soda solution and 50-150g (being that commercially available technical grade lead carbonate and plumbous oxide are mixed by arbitrary proportion), and raw material: activated media is the activated media (corundum ball or Stainless Steel Ball) of 1: 5 (mass ratio), leaching temperature is controlled at 70-90 ℃, under the agitation condition of 300-600 commentaries on classics/min, reaction 60min.The zinc extraction yield is 86.5% in the zinc ore concentrate.Filter, wash leached mud (filter residue) with water, wash water is used to leach operation.Measure commercially available technical grade yellow soda ash: the lead in the leached mud is 1.5: 1 mass ratioes, leach filter residue with sodium carbonate solution, lead sulfide in the filter residue is converted into behind the lead carbonate returns next leaching flow process as leaching reaction promotor, the waste residue after the conversion is used for brickmaking or landfill.Leach liquor can directly be circulated in next leaching flow process after the electrowinning metallic zinc of routine.
Embodiment 2
Zinc ore concentrate with the Mengzi, Yunnan is a raw material, its chemical ingredients such as table 2.
Mengzi, table 2 Yunnan zinc ore concentrate chemical ingredients
The above-mentioned zinc ore concentrate of 100g is crushed to 0.5-1mm to join in the stirring mill reactor, adding 0.8-1.2L concentration simultaneously is the plumbiferous leaching reaction promotor of 2-8M industrial caustic soda solution and 40-100g (commercially available technical grade lead sulfate and lead peroxide mix by arbitrary proportion), and raw material: activated media is (1: 5～1): the activated media of 20 mass ratioes (corundum ball or Stainless Steel Ball), leaching temperature is controlled at 80-90 ℃, reaction 90min under the agitation condition of 300-600 commentaries on classics/min.The zinc extraction yield is 89.2% in the zinc ore concentrate.Filter, wash filter residue with water, wash water remains for leaching operation.Measure commercially available technical grade yellow soda ash: the lead in the leached mud is 2: 1 mass ratioes, and leached mud is converted into behind the lead carbonate lead sulfide as leaching reaction promotor with sodium carbonate solution, returns next leaching flow process, and the waste residue after the conversion is used for brickmaking or landfill.Leach liquor can directly be circulated in next leaching flow process after the electrowinning metallic zinc of routine.
Embodiment 3
With the low-grade mixing zinc ore in Xinjiang is raw material, its chemical ingredients such as table 3.Through material phase analysis, wherein ZnS accounts for 40% of zinc content wherein, ZnO and ZnCO
3Account for 60%.
Table 3 Xinjiang low-grade mixing zinc ore chemical ingredients
The low-grade mixing zinc ore of the above-mentioned 0.5-1mm of being crushed to of 100g is joined in the stirring mill reactor, adding 0.2-0.6L concentration simultaneously is the plumbiferous leaching reaction promotor of 2-8M industrial caustic soda solution and 5-25g (pressing the mixture of arbitrary proportion blended lead nitrate and tri-lead tetroxide), and raw material: activated media is the corundum ball or the Stainless Steel Ball activated media of 1: 10 (mass ratio), leaching temperature is controlled at 70-80 ℃, reaction 120min under the agitation condition of 300-600 commentaries on classics/min.The zinc extraction yield is 81.5% in the zinc ore concentrate.Filter, wash leached mud with water, wash water returns the leaching operation.Measure commercially available technical grade yellow soda ash: the lead in the leached mud is 1.8: 1 mass ratioes, and leached mud is converted into lead carbonate with sodium carbonate solution with lead sulfide becomes the leaching reaction promotor, returns next leaching flow process, and the waste residue after the conversion is used for brickmaking or landfill.Leach liquor can directly be circulated in next leaching flow process after the electrowinning metallic zinc of routine.
Claims (1)
1. the direct method of leaching zinc ore concentrate or low-grade mixing zinc ore of normal pressure alkalescence, it is characterized in that: earlier with zinc ore concentrate or low-grade mixing zinc ore as raw material, be crushed to 0.5～1mm, then with lead-containing compounds as leaching reaction promotor, this leachings reaction promotor is separately or mixes lead sulfate, lead carbonate, plumbous oxide, lead nitrate, lead peroxide or the tri-lead tetroxide of use by arbitrary proportion; Corundum ball or Stainless Steel Ball as activated media, are measured raw material respectively: activated media=1: 5～20 mass ratioes; Leach reaction promotor: zinc sulphide content=1～2.5 in the raw material: 1 mass ratio, the material of measuring is added in the stirring mill activated reactor simultaneously, and be under the condition of 70～100 ℃, stirring velocity 300～600r/min and activation extraction time 60～120min at strong alkali solution, the extraction temperature of 2～8M, raw material is carried out the grinding machinery activatory leach reaction simultaneously, zinc in zinc ore concentrate or the low-grade mixing zinc ore is dissolved, and the zinc leaching rate weight percent is 80～90%; Filter then, the gained leach liquor returns the leaching operation after the electrolysis process of routine extracts metallic zinc, the circulation recycling; The leached mud of gained is by yellow soda ash: the lead in the leached mud is that 1.5～2: 1 mass ratio transforms recovery lead wherein, makes lead carbonate as leaching reaction promotor, returns leaching again, reuses, and waste residue is used for brickmaking or landfill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100395754A CN101033506B (en) | 2007-04-18 | 2007-04-18 | Method of directly leaching zinc ore concentrate or low grade mixing zinc ore under normal pressure and alkaline condition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100395754A CN101033506B (en) | 2007-04-18 | 2007-04-18 | Method of directly leaching zinc ore concentrate or low grade mixing zinc ore under normal pressure and alkaline condition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101033506A CN101033506A (en) | 2007-09-12 |
| CN101033506B true CN101033506B (en) | 2010-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100395754A Expired - Fee Related CN101033506B (en) | 2007-04-18 | 2007-04-18 | Method of directly leaching zinc ore concentrate or low grade mixing zinc ore under normal pressure and alkaline condition |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534208B (en) * | 2011-11-24 | 2013-07-03 | 上海第二工业大学 | Method for alkaline leaching of waste residue containing zinc ferrite or lean zinc ore |
| CN103266226B (en) * | 2013-04-27 | 2014-08-20 | 中南大学 | Method for extracting silver from silver-containing zinc concentrate and improving quality of zinc concentrate |
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