CN104831076A - Resource recycling process of solid waste calcium sulfate - Google Patents
Resource recycling process of solid waste calcium sulfate Download PDFInfo
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- CN104831076A CN104831076A CN201510301483.3A CN201510301483A CN104831076A CN 104831076 A CN104831076 A CN 104831076A CN 201510301483 A CN201510301483 A CN 201510301483A CN 104831076 A CN104831076 A CN 104831076A
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- Prior art keywords
- calcium sulfate
- solid waste
- calcium
- smelting
- resource recycling
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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
Abstract
The invention discloses a resource recycling process of solid waste calcium sulfate. The resource recycling process is applicable to a pyrometallurgy system which needs to add limestone as auxiliary to participate in slagging and is characterized in that under the condition that the temperature is above 1100 DEG C and carbon (coal) exists, the solid waste calcium sulfate is decomposed into calcium oxide and sulfur dioxide, the calcium oxide replaces the limestone to participate slagging and enters smelting slag in the form of calcium silicate (2CaO.SiO2), the sulfur dioxide enters a smoke recycling or processing system along with smelting smoke, the gold and silver in the calcium sulfate are collected and recycled by collectors such as Cu and Pb, resource recycling is achieved, production cost is saved, and environment pollution is reduced.
Description
Technical field:
The present invention relates to solid waste technical field of resource comprehensive utilization, specifically a kind of resource reclaim reutilization technology of solid waste calcium sulfate.
Background technology:
At present, along with the raising of people's environmental protection and awareness of saving energy, the process of solid waste and recycle become more and more important, and the solid waste calcium sulfate that especially smeltery produces contains the detrimental impurity such as gold and silver, copper, lead, belongs to dangerous solid waste, endangers larger; At present, to the method for disposal of solid waste calcium sulfate be cement mill as cement additire, but there is the valuable metals such as the gold and silver contained in calcium sulfate and by the problem of efficient recovery, the wasting of resources can not be caused, also not environmentally.
Summary of the invention:
The object of this invention is to provide a kind of resource reclaim recycling technique of solid waste calcium sulfate, mainly solve the problems such as existing calcium sulfate intractability is large, environmental pollution serious, resource can not fully utilize.
In order to achieve the above object, the present invention is achieved in that a kind of resource reclaim recycling technique of solid waste calcium sulfate, comprises following processing step:
A decomposes: solid waste calcium sulfate mixes (CaSO by a certain percentage with carbon element (coal)
4: C < 2:1), send into smelting furnace with after other supplementary material mixtures, control temperature > 1100 DEG C, calcium sulfate is decomposed into calcium oxide and sulfurous gas: CaSO
4+ 2C=CaS+2CO
2, CaS+3CaSO
4=4CaO+4SO
2, 2CaSO
4+ C=2CaO+2SO
2+ CO
2;
B slag making: calcium sulfate decomposes the calcium oxide generated and participates in slag making reaction, with Calucium Silicate powder (2CaOSiO
2) form enters in smelted furnace cinder, slag making reaction formula is: 2CaO+SiO
2=2CaOSiO
2;
C sulfur dioxide recovery or process: calcium sulfate decomposes the sulfurous gas generated and enters off-gas recovery or treatment system process with flue gas during smelting, arranges outward after process up to standard through exhaust emissions chimney;
D gold and silver reclaim: the gold and silver in calcium sulfate are reclaimed through the trapping of pyrometallurgical smelting system by collecting agent (copper, lead etc.).
Compared with the prior art the resource reclaim recycling technique of a kind of solid waste calcium sulfate of the present invention have outstanding substantive distinguishing features and marked improvement, and 1, replace auxiliary material slagging with Lime stone, reduce the add-on of auxiliary material, save production cost; The valuable elements such as 2, comprehensive resource utilization rate is high, gold and silver are obtained for recycling; 3, processing cost is low, has very high economic worth; 4, environmental issue is solved, meet environmental requirement, calcium sulfate resolves into calcium oxide and sulfurous gas under the existence condition of carbon element (coal), calcium oxide replaces auxiliary material slagging with Lime stone, enter in smelted furnace cinder with Calucium Silicate powder form, sulfurous gas is reclaimed by smoke processing system or processes, and the valuable elements such as gold and silver are reclaimed by collecting agent trapping, thus realizes resource comprehensive utilization utilization and harmless treatment.
Embodiment
In order to Comprehension and Implementation better, describe the present invention in detail below in conjunction with embodiment.
Embodiment 1: calcium sulfate is for containing, for example lower principal element, and its constituent content is as table 1:
Table 1
Take following processing step:
A, batching: solid waste calcium sulfate mixes with carbon element (coal), outsourcing mixed copper concentrate, self-produced slag concentrate, cigarette ash, and the ratio of solid waste calcium sulfate and coal is 3:1, and in mixture, copper grade is 15.42%, sulphur grade is 25.50%, arsenic grade 0.83%, plumbous grade 1.65%, controls slag Fe/SiO
2than being 1.9, concrete ore proportioning rate, as table 2, sends into bottom-blown smelting stove after mixing;
B matte smelting: mixture enters bottom-blown smelting stove, pass into oxygen and air, control matte face 1000mm, temperature 1120 DEG C, material is pyritic smelting in bottom convertor, calcium sulfate is decomposed into calcium oxide and sulfurous gas, calcium oxide participates in slag making reaction, enters in slag with Calucium Silicate powder form, and the copper matte regulus of generation casts positive plate after blowing, refining, obtain product cathode copper and the anode sludge by electrolytic system electrolysis, sulfurous gas reclaims relieving haperacidity by fume recovery system;
C off-gas recovery: the high-temperature flue gas that bottom convertor produces gathers dust through waste heat boiler recovery waste heat, dust precipitator, after thionizer desulfurization relieving haperacidity process up to standard, enter exhaust emissions chimney and arrange outward, the smoke dust that dust precipitator is collected is prepared burden as raw material retrieval system;
D slag treatment: the slag after naturally cooling is through two sections of fragmentations, two sections of ball millings, adopt one thick, two to sweep, the flotation flowsheet of two essences, select copper ore concentrates, flotation tailings enters magnetic separation system, select iron ore concentrate, return production system after copper ore concentrates dehydration and join ore deposit, iron ore concentrate is outer after filter filter dehydration to be sold, and mine tailing is sold as outside material of construction.
Calcium sulfate is decomposed into calcium oxide and sulfurous gas under the existence of carbon element (coal), replaces auxiliary material Wingdale to participate in slag making reaction, and this technique is applicable to need to add the pyrometallurgical smelting system that auxiliary material Wingdale participates in slag making.
Table 2
In pyrometallurgical smelting system, the calcium oxide utilizing solid waste calcium sulfate to decompose generation replaces auxiliary material slagging with Lime stone, and pyrometallurgical smelting system can be need to add any pyrometallurgical smelting system that auxiliary material Wingdale participates in slag making, comprises copper metallurgy industry, plumbous smelting system etc.
Claims (1)
1. a resource reclaim recycling technique for solid waste calcium sulfate, is characterized in that it comprises following processing step:
A, decomposition: solid waste calcium sulfate and carbon element are pressed CaSO
4: the ratio mixing of C < 2:1, send into smelting furnace with after supplementary material mixture, control temperature > 1100 DEG C, calcium sulfate is decomposed into calcium oxide and sulfurous gas: CaSO
4+ 2C=CaS+2CO
2, CaS+3CaSO
4=4CaO+4SO
2, 2CaSO
4+ C=2CaO+2SO
2+ CO
2;
B, slag making: calcium sulfate decomposes the calcium oxide generated and participates in slag making reaction, with Calucium Silicate powder (2CaOSiO
2) form enters in smelted furnace cinder, slag making reaction formula is: 2CaO+SiO
2=2CaOSiO
2;
C, sulfur dioxide recovery or process: calcium sulfate decomposes the sulfurous gas generated and enters off-gas recovery or treatment system with flue gas during smelting, arranges outward after process up to standard through exhaust emissions chimney;
D, gold and silver reclaim: the gold and silver in calcium sulfate are reclaimed through the trapping of pyrometallurgical smelting system by collecting agent (copper, lead etc.).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510301483.3A CN104831076A (en) | 2015-06-04 | 2015-06-04 | Resource recycling process of solid waste calcium sulfate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510301483.3A CN104831076A (en) | 2015-06-04 | 2015-06-04 | Resource recycling process of solid waste calcium sulfate |
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| CN104831076A true CN104831076A (en) | 2015-08-12 |
Family
ID=53809270
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111285390A (en) * | 2020-03-31 | 2020-06-16 | 北京矿冶科技集团有限公司 | Method for comprehensively utilizing industrial gypsum calcium-sulfur resources |
| CN111826526A (en) * | 2020-07-31 | 2020-10-27 | 大冶有色金属有限责任公司 | Method and device for environment-friendly recovery of precious metals in waste circuit board through combined smelting of waste circuit board, copper concentrate and desulfurized gypsum |
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|---|---|---|---|---|
| US3582276A (en) * | 1968-07-22 | 1971-06-01 | Elcor Chem Corp | Process for recovering a metal oxide and sulfur dioxide from metal sulfate |
| US4102989A (en) * | 1974-05-15 | 1978-07-25 | Iowa State University Research Foundation, Inc. | Simultaneous reductive and oxidative decomposition of calcium sulfate in the same fluidized bed |
| CN1775660A (en) * | 2005-11-18 | 2006-05-24 | 四川省犍为明丰化工有限公司 | Method for producing sulfuric acid utilizing phosphogypsum slag |
| CN1884048A (en) * | 2006-06-30 | 2006-12-27 | 昆明理工大学 | Process for reductive decomposition of phosphogypsum by sulfur coal |
| CN101041439A (en) * | 2007-03-01 | 2007-09-26 | 武汉理工大学 | Method for preparing grammite and sulfuric acid by employing waste slag phosphogypsum |
| CN101239706A (en) * | 2008-03-17 | 2008-08-13 | 云南云天化国际化工股份有限公司 | Method for producing calcium sulfide from calcium sulfate |
| CN101519731A (en) * | 2009-04-10 | 2009-09-02 | 山东恒邦冶炼股份有限公司 | Method for extracting high arsenic complicated golden ore concentrate multielement |
| CN102688667A (en) * | 2012-05-21 | 2012-09-26 | 北京中航泰达科技有限公司 | Mobile integrated flue gas purification device |
| CN103397214A (en) * | 2013-07-29 | 2013-11-20 | 中南大学 | Low-carbon treatment method of ardealite in pyrometallurgy of nonferrous metal |
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2015
- 2015-06-04 CN CN201510301483.3A patent/CN104831076A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3582276A (en) * | 1968-07-22 | 1971-06-01 | Elcor Chem Corp | Process for recovering a metal oxide and sulfur dioxide from metal sulfate |
| US4102989A (en) * | 1974-05-15 | 1978-07-25 | Iowa State University Research Foundation, Inc. | Simultaneous reductive and oxidative decomposition of calcium sulfate in the same fluidized bed |
| CN1775660A (en) * | 2005-11-18 | 2006-05-24 | 四川省犍为明丰化工有限公司 | Method for producing sulfuric acid utilizing phosphogypsum slag |
| CN1884048A (en) * | 2006-06-30 | 2006-12-27 | 昆明理工大学 | Process for reductive decomposition of phosphogypsum by sulfur coal |
| CN101041439A (en) * | 2007-03-01 | 2007-09-26 | 武汉理工大学 | Method for preparing grammite and sulfuric acid by employing waste slag phosphogypsum |
| CN101239706A (en) * | 2008-03-17 | 2008-08-13 | 云南云天化国际化工股份有限公司 | Method for producing calcium sulfide from calcium sulfate |
| CN101519731A (en) * | 2009-04-10 | 2009-09-02 | 山东恒邦冶炼股份有限公司 | Method for extracting high arsenic complicated golden ore concentrate multielement |
| CN102688667A (en) * | 2012-05-21 | 2012-09-26 | 北京中航泰达科技有限公司 | Mobile integrated flue gas purification device |
| CN103397214A (en) * | 2013-07-29 | 2013-11-20 | 中南大学 | Low-carbon treatment method of ardealite in pyrometallurgy of nonferrous metal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111285390A (en) * | 2020-03-31 | 2020-06-16 | 北京矿冶科技集团有限公司 | Method for comprehensively utilizing industrial gypsum calcium-sulfur resources |
| CN111826526A (en) * | 2020-07-31 | 2020-10-27 | 大冶有色金属有限责任公司 | Method and device for environment-friendly recovery of precious metals in waste circuit board through combined smelting of waste circuit board, copper concentrate and desulfurized gypsum |
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Application publication date: 20150812 |