CN103693830A - Process for treating free alkali in red mud by microorganisms - Google Patents
Process for treating free alkali in red mud by microorganisms Download PDFInfo
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- CN103693830A CN103693830A CN201310681526.6A CN201310681526A CN103693830A CN 103693830 A CN103693830 A CN 103693830A CN 201310681526 A CN201310681526 A CN 201310681526A CN 103693830 A CN103693830 A CN 103693830A
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Abstract
The invention relates to a process for treating free alkali in red mud by microorganisms. The process comprises the steps of: injecting red mud in a stirring tank in percentage by weight after size mixing; adding an acid solution containing domesticated lactic acid bacteria or thiobacillus ferroxidans, controlling the temperature, pressure and a pH value, filtering ore pulp after being treated by microorganisms to obtain a microorganism-containing solution and red mud after being treated by the microorganisms, and sending filtrate to a microorganism culture tank for continuing culturing the microorganisms, wherein the free alkali in the red mud is less than 0.95 percent, and reaches the requirement of land rehabilitation. The process has the beneficial effects that the acid used by the process is microorganism organic macromolecule weak acid, thus compared with a treatment method using inorganic acid or alkali in the prior art, the process has the advantages of reducing cost, being high in rate of removing the free alkali, short in period, simple in process, low in cost, few in impurities in leachate, low in equipment corrosion rate, convenient for storage and transportation, and beneficial to culture and recycling of microorganisms in a subsequent solution; the treated red mud filter cake contains less than 0.95 percent of free alkali, the environmental harm to the soil is reduced, and the land rehabilitation and utilization can be performed.
Description
Technical field:
The present invention relates to a kind of environmental improvement of Non-ferrous Metallurgy waste, especially, with kind of a microbiological treatment red mud free alkali, make it reach the method for reclaiming.
Background technology:
Red mud is the residue that in aluminum oxide production process, bauxite produces when highly basic leaches, and 1 ton of aluminum oxide of every production just has the red mud of 1.0～1.3 tons to produce.According to estimates, approximately 6,000 ten thousand tons of the red muds of annual whole world aluminium industrial output, China processes 6,000,000 tons of bauxite in year, produces every year 380～4,000,000 tons of red muds.At present, the most of alumina producers in countries in the world are all that red mud is piled up or impouring deep-sea.Depositing of red mud not only takies a large amount of soils and arable land, expends more stockyard construction and maintenance cost, and is present in alkali in red mud to subsurface wastewater infiltration system, makes alkali can not get reclaiming, increasing cost, and causes groundwater pollution.
The material of red mud forms chemical constitution and the mineral composition that comprises red mud, and chemical constitution depends on the additive that adds in the composition of bauxite, the production method of aluminum oxide and production process etc.External red mud is the red mud that Bayer process produces, and domestic except Pingguo is Bayer process red mud, other is sintering process or integrated process red mud.In red mud, all contain a certain amount of Na
20, K
2the alkalimetal oxides such as O are free alkali.External red mud is containing the general 2%-10% of free alkali, and China's red mud is containing the general 2%-5% of free alkali.
CN1594093 discloses a kind of < < Bayer process red mud normal pressure dealkalization method > > the red mud of bayer process process generation is washed, filtered, in red mud filter cake, add milk of lime to mix and carry out de-alkali reaction, milk of lime add-on be take [CaOf]/[Na2O is red] mol ratio as 1.2～6.5 calculating, the weight L/S of the slurry of reaction is 1.5～6.0, at 70 ℃～105 ℃ temperature, after reaction 0.5h～6.5h, reaction slurry through washing, filter, dry after outer row.The method gold is removed 1% alkali, does not reach the requirement of reclaiming.
Sun Daoxing " research that red mud dealkalization is processed and valuable metal titanium scandium extracts " the inorganic industrial > > of < < the 40 volume the tenth phase P49-50.Use lime dealkalize, reduce the environmental hazard of red mud to soil, and extract the wherein method of noble metal.The condition of red mud dealkalization: Calcium Oxide Dosage accounts for 5%～8% of red mud quality, the milk of lime of massfraction 20% and red mud mass ratio are (3～5): at 80～90 ℃ of leaching 2h, when former red mud granularity is less than 180 microns, after dealkalize, red mud is containing total alkali massfraction <1.0%.This way complex process with mineral alkali dealkalize, generates product and is that calcium aluminate is reclaimed to soil is unfavorable.
Along with the industrialized production of aluminium, red mud pollution problem highlighting further.Recently the Ministry of Industry and Information Technology combines the notice of printing and distributing < < red mud comprehensive utilization instruction > > for red mud, in order to carry out the industrial adjustment of the < < of State Council non-ferrous metal and to revitalize planning > >, improve red mud comprehensive utilization ratio and comprehensive utilization technique level, reduce red mud pilling to environment, the impact that safety causes, the needs of protection of the environment, also be to reduce environmental pollution simultaneously, the important channel of maintaining ecological balance.
Summary of the invention
Object of the present invention is just for above-mentioned the deficiencies in the prior art, and a kind of processing method of microbiological treatment red mud free alkali is provided.
The object of the invention is to be achieved through the following technical solutions:
A processing method for free alkali in microbiological treatment red mud, comprises the following steps:
A, by weight percentage red mud is sized mixing and inject steel basin to 10%-30%;
B, add the milk-acid bacteria or the acid solution of iron thiobacillus that contain through domestication, controlling temperature is 10～40 ℃, and pressure is 0.1MPa, controls solution PH=7-8, directly stir process 10～30h;
C, by the ore pulp after microbiological treatment after filtration, obtains containing microbial solution and the red mud after microbiological treatment, and filtrate send microorganism breeding groove to continue microorganisms;
D, the red mud cake free alkali after microbiological treatment are less than 0.95%, have reached the requirement of land reclamation.Every milliliter of ore pulp is no less than 100,000 milk-acid bacterias or iron thiobacillus bacterial classification.
Beneficial effect: the present invention's acid used is microorganism organic polymer weak acid, more existing technique is used the treatment process of mineral acid or alkali to have and is reduced costs, free alkali decreasing ratio is high, cycle is short, and technique is simple, with low cost, in leach liquor, impurity is few, equipment corrosion rate is low, preserves convenient transportation, is beneficial to microorganism culturing and recycling in subsequent solution; Red mud filter cake after processing is less than 0.95% containing free alkali, has reduced the environmental hazard to soil, can carry out land reclamation utilization.
Accompanying drawing explanation
Accompanying drawing: the process method flow chart of microbiological treatment red mud free alkali.
Embodiment
Below in conjunction with drawings and Examples, be described in further detail
A processing method for free alkali in microbiological treatment red mud, comprises the following steps:
A, by weight percentage red mud is sized mixing and inject steel basin to 10%-30%;
B, add the milk-acid bacteria or the acid solution of iron thiobacillus that contain through domestication, controlling temperature is 15～30 ℃, and pressure is 0.1MPa, controls solution PH=7-8, directly stir process 10～30h;
C, by the ore pulp after microbiological treatment after filtration, obtains containing microbial solution and the red mud after microbiological treatment, and filtrate send microorganism breeding groove to continue microorganisms;
D, the red mud cake free alkali after microbiological treatment are less than 1%, have reached the requirement of land reclamation.Every milliliter of ore pulp is no less than 100,000 milk-acid bacterias or iron thiobacillus bacterial classification.
Through the milk-acid bacteria of domestication or the concentration of iron thiobacillus, make to reach 100,000 bacteriums of every milliliter of ore pulp eventually, by inoculated bacteria bacterial classification amount, controlled.
Embodiment 1
In a, red mud, contain free alkali Na2O weight percent 2.8%, K2O weight percent 0.3%, total free alkali weight percent 3.1%.It is 10% that red mud is added to the water weight percent of sizing mixing;
B, the ore pulp after sizing mixing inject steel basin, and controlling temperature is 25 ℃, under the condition that pressure is 0.1MPa, add the milk-acid bacteria acidic solution through domestication, control solution PH=7; Directly stir process is 10 hours.
C, by the ore pulp after processing after filtration, obtains sending the recycle of microorganism breeding groove microorganisms containing microbial solution.
D.. the red mud filter cake through removing after free alkali is processed contains total free alkali 0.8%, has reduced the environmental hazard to soil, can carry out land reclamation utilization.
Embodiment 2
In a, red mud, contain free alkali Na2O weight percent 3.1%, K2O weight percent 0.2%, total free alkali weight percent 3.3%.It is 20% that red mud is added to the water weight percent of sizing mixing.
B, the ore pulp after sizing mixing inject steel basin, and controlling temperature is 15 ℃, under the condition that pressure is 0.1MPa, add the acid solution of iron thiobacillus through domestication, control solution PH=7.5.
Directly stir process is 20 hours.
C, by the ore pulp after processing after filtration, obtains sending the recycle of microorganism breeding groove microorganisms containing microbial solution.
D.. the red mud filter cake through removing after free alkali is processed contains total free alkali 0.9%, has reduced the environmental hazard to soil, can carry out land reclamation utilization.
Embodiment 3
In a, red mud, contain free alkali Na2O weight percent 4.38%, K2O weight percent 0.04%, total free alkali weight percent 4.42%.It is 30% that red mud is added to the water weight percent of sizing mixing.
B, the ore pulp after sizing mixing inject steel basin, and controlling temperature is 20 ℃, under the condition that pressure is 0.1MPa, add the milk-acid bacteria acidic solution through domestication, control solution PH=8.
Directly stir process is 30 hours.
C, by the ore pulp after processing after filtration, obtains sending the recycle of microorganism breeding groove microorganisms containing microbial solution.
D.. the red mud filter cake through removing after free alkali is processed contains total free alkali 0.95%, has reduced the environmental hazard to soil, can carry out land reclamation utilization.
Claims (2)
1. a processing method for free alkali in microbiological treatment red mud, is characterized in that, comprises the following steps:
A, by weight percentage red mud is sized mixing and inject steel basin to 10%-30%;
B, add the milk-acid bacteria or the acid solution of iron thiobacillus that contain through domestication, controlling temperature is 15～30 ℃, and pressure is 0.1MPa, controls solution PH=7-8, directly stir process 10～30h;
C, by the ore pulp after microbiological treatment after filtration, obtains containing microbial solution and the red mud after microbiological treatment, and filtrate send microorganism breeding groove to continue microorganisms;
D, the red mud after microbiological treatment carry out land reclamation.
2. according to the processing method of free alkali in microbiological treatment red mud claimed in claim 1, it is characterized in that, every milliliter of ore pulp is no less than 100,000 milk-acid bacterias or iron thiobacillus bacterial classification.
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| CN201310681526.6A CN103693830A (en) | 2013-12-13 | 2013-12-13 | Process for treating free alkali in red mud by microorganisms |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107244750A (en) * | 2017-08-11 | 2017-10-13 | 中国科学院地球化学研究所 | Red mud leachate processing method and three color moulds are used for the application for handling red mud percolate |
| CN107935332A (en) * | 2017-11-29 | 2018-04-20 | 洛阳理工学院 | A kind of continuous biological dealkalize technique of red mud |
| CN107935340A (en) * | 2017-11-29 | 2018-04-20 | 洛阳理工学院 | A kind of contactless continuous biological dealkalize technique of red mud |
| CN111362538A (en) * | 2020-03-20 | 2020-07-03 | 贵州正业工程技术投资有限公司 | Method for continuously dealkalizing red mud |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2354098A1 (en) * | 2010-02-09 | 2011-08-10 | Biomim-Greenloop | Valorisation of divalent cations in brine and associated co2 sequestration by microorganisms |
| CN102897816A (en) * | 2012-09-29 | 2013-01-30 | 贵州绿水青山环保科技有限公司 | Deep recycling method of red mud |
-
2013
- 2013-12-13 CN CN201310681526.6A patent/CN103693830A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2354098A1 (en) * | 2010-02-09 | 2011-08-10 | Biomim-Greenloop | Valorisation of divalent cations in brine and associated co2 sequestration by microorganisms |
| CN102897816A (en) * | 2012-09-29 | 2013-01-30 | 贵州绿水青山环保科技有限公司 | Deep recycling method of red mud |
Non-Patent Citations (1)
| Title |
|---|
| 王利英等: "赤泥脱碱的研究", 《科技信息》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107244750A (en) * | 2017-08-11 | 2017-10-13 | 中国科学院地球化学研究所 | Red mud leachate processing method and three color moulds are used for the application for handling red mud percolate |
| CN107935332A (en) * | 2017-11-29 | 2018-04-20 | 洛阳理工学院 | A kind of continuous biological dealkalize technique of red mud |
| CN107935340A (en) * | 2017-11-29 | 2018-04-20 | 洛阳理工学院 | A kind of contactless continuous biological dealkalize technique of red mud |
| CN107935332B (en) * | 2017-11-29 | 2020-03-31 | 洛阳理工学院 | Continuous biological dealkalization process for red mud |
| CN111362538A (en) * | 2020-03-20 | 2020-07-03 | 贵州正业工程技术投资有限公司 | Method for continuously dealkalizing red mud |
| CN111362538B (en) * | 2020-03-20 | 2022-01-28 | 贵州正业工程技术投资有限公司 | Method for continuously dealkalizing red mud |
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Application publication date: 20140402 |