CN103508507A - Method for removing metal ions in water by utilizing magnetically-separated steel slag tailings - Google Patents
Method for removing metal ions in water by utilizing magnetically-separated steel slag tailings Download PDFInfo
- Publication number
- CN103508507A CN103508507A CN201210220254.5A CN201210220254A CN103508507A CN 103508507 A CN103508507 A CN 103508507A CN 201210220254 A CN201210220254 A CN 201210220254A CN 103508507 A CN103508507 A CN 103508507A
- Authority
- CN
- China
- Prior art keywords
- steel slag
- slag tailings
- tailings
- magnetic separation
- ion
- 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.)
- Granted
Links
Images
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for removing metal ions in water by utilizing magnetically-separated steel slag tailings. The method for removing heavy metal ions from waste water by utilizing magnetically-separated steel slag tailings containing less iron content comprises the steps of grinding, drying and screening the magnetically-separated steel slag tailings, and then placing into a reactor; adding waste water (containing heavy metal ions) into the reactor, and fully mixing; and separating solid from liquid to obtain tailings, and treating to discharge water. According to the method, as a material for water treatment, the magnetically-separated steel slag tailings is low in cost, wide in sources and large in specific weight, thus being convenient to recycle, and having less possibility of causing secondary pollution. In addition, the steel slag tailings belong to solid waste, thus achieving the purpose of treating wastes with wastes after being applied into waste water treatment, and having excellent economic and environment-friendly benefits.
Description
Technical field
The invention belongs to Industrial Wastewater Treatment and solid waste resource recovery utilizes field, relate to a kind of steel slag tailings after magnetic separation treatment technology to effluent containing heavy metal ions that utilizes.
Background technology
In recent years, along with social development, heavy metal contamination has become the sharp sword that can not ignore that social development brings, the deep researchdevelopment direction that affects environment protection, especially water environment protection.Heavy metal-pollutedly have a finger in every pie the environmental pollution being caused by heavy metal or its compound.Heavy metal ion is mainly from industries such as nonferrous smelting, plating, chemical industry, printing and dyeing, mining industry, and enter after environment as pollution substance, can not be degraded by Institute of Micro-biology, can only there is mutual conversion and dispersion and enrichment between form, and transmit enrichment along biologic chain, finally by fishery products and plant, enter human body, jeopardize human body health.For example, cadmium is a kind of nonessential element of human body, has bio-toxicity, and long-term absorption can cause cadmium to be accumulated in vivo, can cause the disease of respiratory tract and Gan,Shen Deng aspect, causes " itai-itai ".At the beginning of 2011 4 months, China first " 12 " ad hoc planning---" heavy metal contamination integrated control " 12 " planning " obtains State Council and formally gives an written reply, control program makes every effort to control 5 heavy metal species, and 5 heavy metal species are respectively: lead, mercury, cadmium, chromium, arsenic.Therefore, for the improvement of the heavy metal in waste water to the stage can not be ignored.Method for the treatment of heavy metal ion in water has a lot, as: biotechnology repairing method, chemical precipitation method, absorption method, ion exchange method, adsorption-flocculation method etc., but because the processing cost of these methods is generally higher, while being applied in the middle of actual wastewater treatment, be restricted, therefore find a kind of economical and practical material for water treatment extremely urgent.
Slag is the slag of discharging in steelmaking process, in steelmaking process, utilize the elements such as carbon in air or oxygen deoxidation furnace charge (being mainly the pig iron), silicon, manganese, phosphorus, and the slag that at high temperature reacts and form with flux (being mainly Wingdale), its formations mainly comprises: the impurity that in metal charge, the oxide compound of the oxidized rear generation of each element, the gainster being etched and stove material, metal charge are brought into and the slag making materials that adds specially for adjustment iron and steel character etc.Therefore often say: the process of steel-making is exactly the process of a slag making.The main chemical of slag has CaO, SiO
2, FeO, Fe
2o
3, Al
2o
3, MgO etc., along with the difference to some extent of main body mineral facies in the different slags of basicity, but it forms substantially constant.
Summary of the invention
The object of the present invention is to provide a kind of method of utilizing the steel slag tailings after magnetic separation to remove the heavy metal ion in water, the present invention can remove the heavy metal ion in water effectively, reduce the harm that in water, heavy metal ion is brought, and can not produce secondary pollution to environment after using.
The technical solution that realizes the object of the invention is:
(1) steel slag tailings after magnetic separation is ground, is dried, is screened, standby;
(2) steel slag tailings (1) Suo Shu is added in the reactor of effluent containing heavy metal ions in proportion;
(3) make steel slag tailings fully react and mix with effluent containing heavy metal ions;
(4) solid-liquid separation tailings, obtains processing rear water outlet;
In step (1), slag source comprises bessemer furnace slag, open hearth slag and electric furnace slag.Magnetic separation is ground rear particle diameter by the steel slag tailings that grinds, is dried, screens should be between 5 ~ 500 orders.
The ratio that adds described in step (2) should be at 1:1 ~ 1:500(by heavy metal: steel slag tailings weight ratio), under different condition, be to improve treatment effect, increase the ratio that adds of tailings and heavy metal ion.Present method is applicable to the processing of the effluent containing heavy metal ions of various starting point concentrations, and described heavy metal ion comprises: the metal ions such as cadmium, copper, zinc, lead, chromium.And in treating processes, can regulate pH value and temperature at optimum range.
In step (3), reaction process can adopt dynamically continuous or static intermittent process, comprises the method mixing such as vibration and stirring, and the reaction times is between 1h ~ 36h.
The method of solid-liquid separation comprises the methods such as precipitation, centrifugal, filtration in step (4), and sedimentation time is between 30 ~ 900min, and separation or reclaim reacted tailings.
The present invention compared with prior art, its remarkable advantage: what the present invention selected is the steel slag tailings abandoned after magnetic separation iron, and wherein iron-holder is few, and cost is more cheap, originates more extensive.
Because the main component in steel slag tailings is CaO, Al
2o
3, the metal oxide such as MgO, when it is placed in water, easily generate hydroxide ion, make solution alkalize.And the heavy metal ion in water can form stable precipitation of hydroxide with hydroxide ion, therefore can utilize this coagulating sedimentation effect of tailings to remove the part heavy metal ion in waste water.In addition, slag is loose porous, and specific surface area is large, has certain adsorptive power, therefore steel slag tailings or a kind of good adsorption treatment agent.In addition, steel slag tailings also has than great, and the feature that settling property is good, therefore be convenient to after using reclaim, is difficult for producing secondary pollution.These physicochemical property that comprehensive steel slag tailings has, the heavy metal ion of utilizing steel slag tailings to remove in waste water is a kind of effective way.In addition, slag itself is a kind of solid waste, utilizes slag processing waste water, makes it reach emission request, and realizes the object of " treatment of wastes with processes of wastes against one another ", and good economy and environmental benefit.
The steel slag tailings that the present invention is usingd after magnetic separation is as water conditioner, utilize the physicochemical property of himself to can be good at removing the heavy metal ion in water, and treatment effect is stable, operating process is simple, be easy to grasp, wide material sources, with low cost, with respect to the chemical precipitation method of generally using and traditional sorbing material, there is significant advantage.Therefore, the present invention has good economic worth, practical value and the value of environmental protection for removing the heavy metal ion of waste water.
Accompanying drawing explanation
Fig. 1 is is 25 ℃ in temperature, under the neutrallty condition that rotating speed is 150r/min, and the adsorption effect of 90 ~ 150 order steel slag tailings to Cd (II) in different concns cadmium solution.Wherein X-coordinate is the concentration of Cd (II) in solution after adsorption equilibrium, and ordinate zou is the adsorptive capacity of steel slag tailings to Cd (II).As seen from the figure, steel slag tailings enlarges markedly along with the increase of concentration for the adsorptive capacity of the Cd in water (II).
Fig. 2 is under neutrallty condition, the adsorption effect of the steel slag tailings of different time to Cd in cadmium solution (II).Wherein X-coordinate is adsorption time, and ordinate zou is the adsorptive capacity of steel slag tailings to Cd (II).As seen from the figure, steel slag tailings is removed comparatively rapid to the Cd in water (II).
Fig. 3 is the impact of steel slag tailings dosage on absorption Cd (II).
Fig. 4 is under the condition of different rotating speeds, the variation tendency of steel slag tailings to the clearance of Cd in solution (II).Wherein X-coordinate is rotating speed, and ordinate zou is that steel slag tailings is for the clearance of Cd in solution (II).As seen from the figure, under different shaking speed, steel slag tailings all has good removal effect for Cd (II).
Fig. 5 is that the difference of particle diameter is removed the impact of Cd (II) in solution for steel slag tailings.Wherein X-coordinate is particle diameter, and ordinate zou is the clearance of steel slag tailings to Cd (II).
Fig. 6 is for to add under the condition of constant rate, and different Cd (II) starting point concentration is for the impact of steel slag tailings adsorptive capacity.Wherein X-coordinate is Cd (II) starting point concentration, and ordinate zou is the adsorptive capacity of steel slag tailings to Cd (II).Embodiment
Take below cadmium ion (Cd (II)) and cupric ion (Cu (II)) is example, and the invention will be further described in conjunction with the accompanying drawings and embodiments:
embodiment 1:taking particle diameter is 90 ~ 150 object steel slag tailings powder 0.2g, adds in the neutral cadmium-containing solution of pH of 200ml different concns, puts into constant-temperature table, in temperature, is 25 ℃, samples after reacting 24h under the condition that rotating speed is 150r/min.Water sample precipitation, after 30 minutes, is filtered, and measures the concentration of cadmium in water outlet.The concentration of cadmium adopts atomic absorption spectrophotometer to measure, and treatment effect is shown in accompanying drawing 1, and wherein tailings increases along with the increase of starting point concentration for the adsorptive capacity of the cadmium ion in water, and maximal absorptive capacity is about 150mg/g.
embodiment 2:taking particle diameter is 90 ~ 150 object steel slag tailings powder 1g, and adding 1000ml concentration is in the neutral cadmium-containing solution of pH of 100mg/L, mixes, and sample in the different time under constant temperature blender with magnetic force condition.Water sample under the condition of 4000r/min centrifugal 10 minutes, more after filtering, measure the concentration of cadmium in water outlet.The concentration of cadmium adopts atomic absorption spectrophotometer to measure, and treatment effect is shown in accompanying drawing 2, as seen from the figure, when the reaction times, is greater than 1h, and removal effect is better, and keeps stable.
embodiment 3: taking Different Weight particle diameter is 90 ~ 150 object steel slag tailings powder, the different ratio that adds of take adds in the neutral cadmium-containing solution of pH that 100ml concentration is 100mg/L, put into constant-temperature table, after temperature is 25 ℃, reacts 24h under the condition that rotating speed is 150r/min, sample.Water sample precipitation, after 60 minutes, is filtered, and measures the concentration of cadmium in water outlet.The concentration of cadmium adopts atomic absorption spectrophotometer to measure, and its treatment effect is shown in accompanying drawing 3, as seen from the figure, under finite concentration, exists the best to add ratio.
embodiment 4:taking particle diameter is 90 ~ 150 object steel slag tailings powder 1g, and adding 1000ml concentration is in the neutral cadmium-containing solution of pH of 100mg/L, samples after mixing 2h under different rotating speeds.Water sample under the condition of 4000r/min centrifugal 10 minutes, more after filtering, measure the concentration of cadmium in water outlet.The concentration of cadmium adopts atomic absorption spectrophotometer to measure, and its treatment effect is shown in accompanying drawing 4, and as seen from the figure, under different stirring velocitys, tailings all has good removal effect.
embodiment 5:take the steel slag tailings powder of different-grain diameter, in mass ratio for 1:10(cadmium: it is in the neutral cadmium-containing solution of 100mg/L that ratio tailings) adds concentration, is 25 ℃ in temperature, sample after reacting 2h under the condition that rotating speed is 180r/min.Water sample under the condition of 4000r/min centrifugal 10 minutes, more after filtering, measure the concentration of cadmium in water outlet.The concentration of cadmium adopts atomic absorption spectrophotometer to measure, and its treatment effect is shown in accompanying drawing 5.As seen from the figure, clearance increases along with reducing of particle diameter, but whole clearance is all more than 65%.
embodiment 6:take 90 ~ 150 object steel slag tailings powder, in mass ratio for 1:10(cadmium: ratio tailings) adds in the neutral cadmium-containing solution of different concns, is 30 ℃ in temperature, sample after reacting 2h under the condition that rotating speed is 180r/min.Water sample under the condition of 4000r/min centrifugal 10 minutes, more after filtering, measure the concentration of cadmium in water outlet.The concentration of cadmium adopts atomic absorption spectrophotometer to measure, and its treatment effect is shown in accompanying drawing 6.As seen from the figure, in the situation that adding constant rate, starting point concentration is little for the impact of clearance, and therefore, the ratio that adds is for controlling the key factor of removal effect.
embodiment 7:according to the implementation method of above embodiment, cupric ion (Cu (II)) has been carried out to same experiment.Result shows, in the ratio that adds at 1:5 ~ 1:20(copper: tailings), the reaction times, clearance all reached more than 90% in the situation that of 1h ~ 36h, illustrated that the steel slag tailings after magnetic separation also has good removal effect for the cupric ion in water.
By above embodiment, can illustrate, steel slag tailings all has good treatment effect for the heavy metal ion in water.Use steel slag tailings to process effluent containing heavy metal ions, after hybrid reaction, effluent quality can reach the requirement of the industrial wastewater discharge standard of national regulation under certain condition.
Claims (7)
1. utilize the steel slag tailings after magnetic separation to remove the method that underwater gold belongs to ion, it is characterized in that the method comprises the following steps:
(1) after the steel slag tailings after magnetic separation is ground, is dried, is screened, standby;
(2) steel slag tailings step (1) Suo Shu is added in the reactor that contains effluent containing heavy metal ions in proportion;
(3) make steel slag tailings and contain the abundant hybrid reaction of effluent containing heavy metal ions;
(4) solid-liquid separation tailings, obtains processing the water outlet of after purification.
2. according to the steel slag tailings after magnetic separation that utilizes described in claim 1, remove the method that underwater gold belongs to ion, it is characterized in that the steel slag tailings source described in step (1) comprises bessemer furnace slag, open hearth slag and electric furnace slag.
3. according to the steel slag tailings after magnetic separation that utilizes described in claim 1, remove the method that underwater gold belongs to ion, it is characterized in that: the particle diameter of the steel slag tailings after the magnetic separation described in step (1) is between 5 ~ 500 orders.
4. according to the steel slag tailings after magnetic separation of utilizing described in claim 1, remove the method that underwater gold belongs to ion, it is characterized in that: the ratio that adds described in step (2) is between 1:1 ~ 1:500, by heavy metal: steel slag tailings weight ratio.
5. according to the steel slag tailings after magnetic separation that utilizes described in claim 1, remove the method that underwater gold belongs to ion, it is characterized in that: the reactive mode of the reactor described in step (2) is static reaction or dynamic response.
6. according to the steel slag tailings after magnetic separation that utilizes described in claim 1, remove the method that underwater gold belongs to ion, it is characterized in that: the reaction times described in step (3) is 1h ~ 36h.
7. according to the steel slag tailings after magnetic separation that utilizes described in claim 1, remove the method that underwater gold belongs to ion, it is characterized in that: the method for the solid-liquid separation described in step (4) is precipitation, centrifugal or filtration, and sedimentation time is between 30 ~ 900min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210220254.5A CN103508507B (en) | 2012-06-29 | 2012-06-29 | The removal of the steel slag tailings after magnetic separation underwater gold is utilized to belong to the method for ion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210220254.5A CN103508507B (en) | 2012-06-29 | 2012-06-29 | The removal of the steel slag tailings after magnetic separation underwater gold is utilized to belong to the method for ion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103508507A true CN103508507A (en) | 2014-01-15 |
| CN103508507B CN103508507B (en) | 2015-12-02 |
Family
ID=49892002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210220254.5A Expired - Fee Related CN103508507B (en) | 2012-06-29 | 2012-06-29 | The removal of the steel slag tailings after magnetic separation underwater gold is utilized to belong to the method for ion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103508507B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060439A (en) * | 2015-08-28 | 2015-11-18 | 上海中冶环境工程科技有限公司 | Method for treating acid chromium-contained polluted waste water with molten iron residues as raw material |
| CN105217978A (en) * | 2014-06-11 | 2016-01-06 | 南京理工大学 | A kind of resource utilization recycling produces device and the technique of steel slag cement |
| CN105800711A (en) * | 2016-05-27 | 2016-07-27 | 北京泰克美高新技术有限公司 | Method for treating hexavalent chromium in wastewater by using gold tailing products |
| CN106865729A (en) * | 2017-03-22 | 2017-06-20 | 中钢集团武汉安全环保研究院有限公司 | A kind of method of utilization molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby |
| CN109607947A (en) * | 2018-12-25 | 2019-04-12 | 贵州省分析测试研究院 | A method of removing coal washery heavy metal in waste water arsenic |
| CN110624498A (en) * | 2018-06-21 | 2019-12-31 | 宝山钢铁股份有限公司 | Composite steel slag-based heavy metal adsorbent |
| CN111196618A (en) * | 2020-03-16 | 2020-05-26 | 河北省科学院生物研究所 | Method for removing cobalt ions and/or antibiotics in wastewater |
| CN112776191A (en) * | 2021-02-01 | 2021-05-11 | 中兴惠和(山东)环保科技有限公司 | Stone cutting sewage treatment device and using method thereof |
| CN115849492A (en) * | 2022-11-22 | 2023-03-28 | 核工业北京化工冶金研究院 | Method for treating uranium-containing acidic wastewater |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1948190A (en) * | 2006-11-07 | 2007-04-18 | 南京大学 | Treatment method of waste water in fluorofen production |
| CN1994916A (en) * | 2006-12-29 | 2007-07-11 | 上海师范大学 | Steel slag composition for removing divalent cadmium ion and its production method and uses |
| CN101716487A (en) * | 2009-12-31 | 2010-06-02 | 成都信息工程学院 | Steel slag composite adsorbing agent and method for processing printing and dyeing wastewater |
-
2012
- 2012-06-29 CN CN201210220254.5A patent/CN103508507B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1948190A (en) * | 2006-11-07 | 2007-04-18 | 南京大学 | Treatment method of waste water in fluorofen production |
| CN1994916A (en) * | 2006-12-29 | 2007-07-11 | 上海师范大学 | Steel slag composition for removing divalent cadmium ion and its production method and uses |
| CN101716487A (en) * | 2009-12-31 | 2010-06-02 | 成都信息工程学院 | Steel slag composite adsorbing agent and method for processing printing and dyeing wastewater |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105217978A (en) * | 2014-06-11 | 2016-01-06 | 南京理工大学 | A kind of resource utilization recycling produces device and the technique of steel slag cement |
| CN105217978B (en) * | 2014-06-11 | 2017-06-20 | 南京理工大学 | A kind of resource recycles the device and technique of production slag cement |
| CN105060439A (en) * | 2015-08-28 | 2015-11-18 | 上海中冶环境工程科技有限公司 | Method for treating acid chromium-contained polluted waste water with molten iron residues as raw material |
| CN105800711A (en) * | 2016-05-27 | 2016-07-27 | 北京泰克美高新技术有限公司 | Method for treating hexavalent chromium in wastewater by using gold tailing products |
| CN106865729A (en) * | 2017-03-22 | 2017-06-20 | 中钢集团武汉安全环保研究院有限公司 | A kind of method of utilization molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby |
| CN110624498A (en) * | 2018-06-21 | 2019-12-31 | 宝山钢铁股份有限公司 | Composite steel slag-based heavy metal adsorbent |
| CN110624498B (en) * | 2018-06-21 | 2022-08-16 | 宝山钢铁股份有限公司 | Composite steel slag-based heavy metal adsorbent |
| CN109607947A (en) * | 2018-12-25 | 2019-04-12 | 贵州省分析测试研究院 | A method of removing coal washery heavy metal in waste water arsenic |
| CN111196618A (en) * | 2020-03-16 | 2020-05-26 | 河北省科学院生物研究所 | Method for removing cobalt ions and/or antibiotics in wastewater |
| CN111196618B (en) * | 2020-03-16 | 2022-05-31 | 河北省科学院生物研究所 | Method for removing cobalt ions and/or antibiotics in wastewater |
| CN112776191A (en) * | 2021-02-01 | 2021-05-11 | 中兴惠和(山东)环保科技有限公司 | Stone cutting sewage treatment device and using method thereof |
| CN115849492A (en) * | 2022-11-22 | 2023-03-28 | 核工业北京化工冶金研究院 | Method for treating uranium-containing acidic wastewater |
| CN115849492B (en) * | 2022-11-22 | 2024-07-16 | 核工业北京化工冶金研究院 | Treatment method of uranium-containing acidic wastewater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103508507B (en) | 2015-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103508507B (en) | The removal of the steel slag tailings after magnetic separation underwater gold is utilized to belong to the method for ion | |
| CN103540765B (en) | Zinc smelting technology | |
| Suiyi et al. | A novel clinoatacamite route to effectively separate Cu for recycling Ca/Zn/Mn from hazardous smelting waterwork sludge | |
| CN102580743B (en) | Method for preparing oxidation catalyst from gold ore tailing slag, and prepared oxidation catalyst and application thereof | |
| CN108128917B (en) | Method for removing various pollutants in copper smelting waste acid by using Bayer process red mud | |
| CN110564970A (en) | Process method for recovering potassium, sodium and zinc from blast furnace cloth bag ash | |
| CN110090548B (en) | Method for wet desulphurization and zinc sulfate recovery of copper slag tailings and zinc smelting fly ash | |
| CN103588240B (en) | A kind of green utilization method of dirty acid | |
| CN111925017B (en) | Method for treating high-arsenic contaminated acid by using zinc slag | |
| CN111252875A (en) | Treatment process of heavy metal-containing wastewater | |
| CN103182292B (en) | Novel Cr (VI) adsorbent and preparation method thereof | |
| CN101545037B (en) | Method for producing iron ore concentrate by using poor-tin oxidized ore tailings | |
| WO2023004925A1 (en) | Method for enriching and recovering chromium resources by synergistic utilization of chromium-containing sludge and chromium-containing waste residue | |
| CN105149317A (en) | Method for removing heavy metals in hazardous waste incineration fly ash through nanometer zero-valent iron | |
| CN104745495A (en) | Efficient desulfurizing bacreria and use method thereof in removal of sulfur in iron ore | |
| CN104310553A (en) | Resource utilization method of blast furnace dust | |
| CN102766717A (en) | Method for treating high phosphorus ore by using direct reduction process | |
| CN105671311A (en) | Processing method of iron ore | |
| CN113562830B (en) | Preparation method of copper smelting waste acid arsenic precipitating agent | |
| CN104874402A (en) | Preparation of vanadium-titanium steel slag-based zinc ferrite catalyst and method for treating printing and dyeing wastewater | |
| CN105327926B (en) | A kind of method that calcium iron dioxygen carrier is prepared by raw material of converter slag | |
| CN110575812B (en) | Environment-friendly adsorbing material for efficient phosphorus removal of argil/pyrolusite and preparation method thereof | |
| CN110699543B (en) | Method for preparing iron ore sintered pellet binder by using steel oily sludge, binder and application | |
| CN112028330A (en) | Method for treating arsenic-containing contaminated acid by taking fayalite as in-situ iron source | |
| CN101956069A (en) | Method for reducing and leaching manganese from pyrolusite in sulfuric acid solution by using sludge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151202 Termination date: 20210629 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |