CN103801548B - A kind of stepped utilization method of high-sulfur Low-silica iron ore tailings - Google Patents
A kind of stepped utilization method of high-sulfur Low-silica iron ore tailings Download PDFInfo
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- CN103801548B CN103801548B CN201310719086.9A CN201310719086A CN103801548B CN 103801548 B CN103801548 B CN 103801548B CN 201310719086 A CN201310719086 A CN 201310719086A CN 103801548 B CN103801548 B CN 103801548B
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The present invention relates to a kind of stepped utilization method of high-sulfur Low-silica iron ore tailings, 1,60 ~ 80 object sieve screenings, sieve upper part about 70%, lower part of screen divides about 30%; 2, sieve the thick tailings that upper part is about 70%, substitute 50 ~ 60% river sand preparation standard mortars; 3, lower part of screen is divided and is about 30% thin mine tailing, and floatation desulphurization selects the iron concentrate of 6.14%, and sulphur grade reaches 44.65%, and for the preparation of sulfuric acid, after Sulphuric acid, remaining high scum Iron grade reaches 63%; 24.6% fine sand selecting sulphur later, selects iron by high intensity magnetic separation technology, selects iron to remain the high tailings of 7.14% silicone content later, prepares highly active mine tailings admixture; The tailings that 17.47% iron content that high intensity magnetic separation sub-elects is high, directly as the raw material cement baking in cement plant.Iron tailings utilizes scope from the barren rock cut into a mountain and iron tailings sand by the present invention, then to mine tailings admixture, achieves 100% cascade utilization of mine solid waste.
Description
Technical field
The invention belongs to iron tailings technical field of resource comprehensive utilization, be specifically related to a kind of step Resource comprehensive utilization method of high-sulfur Low-silica iron ore tailings.
Background technology
China is a mining powers, the mine tailing burden produced because of exploitation mineral resources every year and discharge capacity very huge, the mine tailing amount that countries in the world produce every year about 5,000,000,000 tons, and China only 2000 the end of the year ore deposit generation just reach about 600,000,000 tons, the grade of the most of mine resources of China is lower, a large amount of mine tailings is discharged in beneficiation flowsheet, along with the raising of mineral resource utilization degree, ore can the corresponding reduction of mining grade, mine tailing discharge rate is also in increase, at present, the mine tailing that China's metal mine is stored up about has 10,000,000,000 tons, and with the speed of annual output 8 ~ 1,000,000,000 tons of mine tailings in increase, wherein: iron ore mine year produces mine tailing just 6 ~ 700,000,000 tons, and China's comprehensive utilization of tailing rate only has about 10% at present, a large amount of mine tailings can only be deposited in Tailings Dam or some natural places, so many mine tailing inevitably brings a series of problem, it not only occupies a large amount of soils, and serious harm is caused to mining area ecological environment.
Current iron tailings comprehensive utilization concentrates on building material industry, prepares various non-burning brick, hollow brick, colour floor tile, steam-pressing brisk and fired brick as utilized iron tailings; Iron tailings is utilized to serve as fine aggregate or fine aggregate production concrete and concrete hollow block; CHARACTERISTICS OF TAILINGS SAND is utilized to prepare glass or devitrified glass is also developed and applied.
Iron tailings has research at home and abroad as cement slurry, devitrified glass and ceramic raw material, brick producing material, concrete coarse-fine aggregate and various mortar fine aggregate etc. utilization ways, but still there is a lot of problem.
Iron tailings is due to from different places, its minerals commonly used in chemical industry composition there are differences, and for the exploitation of different enterprise and the difference of ore dressing mechanism, the iron tailings physical property of discharging is different, for the qualitative difference of each enterprise iron tailings, the approach as building material field application is also variant.
Iron tailings produces concrete base building material as fine aggregate, fine aggregate partly can only be replaced because its grain diameter is little, content of stone powder is high, or prepare the lower concrete base building material of strength mark (masonry mortar or low-grade concrete), aggregate size is being required to thinner mortar research is also few.
Use in concrete base building material to iron tailings both at home and abroad at present, major part selects the mine tailing of modulus of fineness within the scope of medium sand and fine sand to apply, and the modulus of fineness of in fact most of iron tailings sand is in ultra fine sand scope, be not well used beyond building sand scope because its content of stone powder is higher, if utilize mine tailing and natural sand or Machine-made Sand compound use, the scope of application of mine tailing just can be expanded.
Summary of the invention
The object of the invention is for current iron tailings at building material industry application Problems existing, with the high efficiente callback of valuable component in iron tailings and utilization, high added value whole utilization and produce green, environmental protection large construction material for target, solve the problem of iron tailings comprehensive utilization value and utilization rate aspect, a kind of stepped utilization method of high-sulfur Low-silica iron ore tailings is provided.
Technical solution of the present invention is: first taking point granularity to extract has valency component in iron tailings, and then by varigrained iron tailings, is respectively used to produce green building material and high added value material.
For the iron tailings of the coarseness sub-elected, sulfur content reaches the standard of building sand, can be used for replacing river sand to produce premixing dry-mixed mortar and air-entrained concrete building block.
For the fine grained iron tailings sub-elected, due to the character of mineral itself, most of sulphur and iron are all in fine grain iron tailings.Ore dressing process is carried out to fine grained mine tailing, selects iron concentrate, can sell as product, remaining fine grained after sulphur removal, then carry out selecting iron process, the mine tailing that the iron content sub-elected is high, can directly as the raw material of mud of heating up water; The mine tailing that remaining iron content is low, exciting its activity by adding exciting agent, then grinding (mechanical activation), preparing highly active unburned mine tailings admixture, can concrete admixture be done, also can make the admixture of air-entrained concrete building block and premixing dry-mixed mortar.Present invention achieves the cascade utilization pattern of iron tailings 100% efficiency utilization.
Object of the present invention is realized by following steps.
1, physical and chemical composition analysis is carried out to iron tailings, and its radioactivity of multi-point sampler on the spot.
2, the relation of the granularity of iron tailings and sulphur, iron content is studied, sieve 20,40,60,80,100 order of certain order number is adopted to sieve, the content of Fe, S, Si tested sieve upper part and lower part of screen respectively and divide, select the sieve sulfur content of upper part, silicone content can meet the order number that building material industry requires, recycling can be carried out for target with what ensure thick tailings; Lower part of screen is divided into the thin tailings of sulphur and iron enrichment, for the lower thin tailings of sieve, first carries out the research of floatation desulphurization, enrichment iron concentrate, then to selecting the further high intensity magnetic separation separation of iron of the thin tailings of over cure.
3, point granularity extract in iron tailings have valency component after, varigrained iron tailings is respectively used to produce green building material and high added value material.Because the tailings granularity of Nanshan Mine is comparatively thin, is 0.82 according to the modulus of fineness of the standard detection iron milltailings of building sand, belongs to the scope of fine sand, therefore for the iron tailings of sieve upper part, the barren rock (preparing artificial sand) cut into a mountain can be utilized, form continuous grading, prepare premixing dry-mixed mortar.
4, for the iron tailings that lower part of screen is divided, due to the character of mineral itself, most of sulphur and iron all concentrate in the iron tailings divided lower part of screen.Ore dressing process is carried out to this part mine tailing, iron concentrate Ts >=35% selected, iron ore concentrate TFe >=61%, can be used as iron ore concentrate, iron concentrate product is sold.Remaining fine grained after selecting over cure and iron, carries out the unburned mine tailings admixture of activation preparation by physics (mechanical grinding) chemistry (interpolation chemical agent) method.
5, the iron tailings sand overall grain size due to Nanshan Mine is less, and the overwhelming majority, all at below 0.6mm, belongs to the scope of fine sand, and after further levigate, can be used for the river sand of replacement 70% ~ 80% produces air-entrained concrete building block.
Utilize relative to existing disclosed iron tailings building materials field, the present invention has following outstanding feature.
1, by iron tailings according to different grain size cascade utilization, sieved by selected order number, to different-grain diameter classified utilization, the mine tailing amount being reclaimed iron and sulphur by ore dressing decreases about 70%, reduces cost, improves utilization ratio.
2, the part that CHARACTERISTICS OF TAILINGS SAND is thick can be used as building sand in concrete or mortar, alleviate the present situation in short supply of sand resource, but the tailings modulus of fineness after deironing sulphur removal is less, do not meet concrete or mortar sand standard, this part CHARACTERISTICS OF TAILINGS SAND grinding to certain fineness, exciting its activity by adding exciting agent, preparing unburned mine tailings admixture, be applied in concrete or other building material, the present situation of current admixture shortage can be alleviated.
3, premixing dry-mixed mortar breaches the conventional understanding only utilizing CHARACTERISTICS OF TAILINGS SAND, and the scope of utilization from the barren rock cut into a mountain and iron tailings sand, then to mine tailings admixture, achieves 100% cascade utilization of mine solid waste.
Accompanying drawing explanation
Fig. 1 is iron tailings cascade utilization route map.
Detailed description of the invention
Below in conjunction with example, the present invention will be further described.
The present embodiment is for Ma ' anshan City Nanshan Mine, and Ma ' anshan City Nanshan Mine is maximum iron ore base, China East China, and be positioned at Xiang Shan town, Maanshan City, year last person ore deposit, mining area will reach 1,000 ten thousand tons.2010, iron ore deposit amount 7.88 hundred million tons was possessed in mining area, but iron ore grade is very low, the exploitation of low-grade iron ore, by producing a large amount of iron tailings, estimates at more than 500,000,000 ton, adding more than the 100000000 ton of iron tailings stored up in early days, will there is the problem that a large amount of mine tailing is stored up without ground in Nanshan Mine.
For the problem that Nanshan Mine iron tailings is stored up, the invention provides a kind of stepped utilization method, carry out according to following steps.
1, South Mountain iron tailings composition and radiological measuring, South Mountain CHARACTERISTICS OF TAILINGS SAND main component is as shown in table 1 below.
Table 1 Nanshan Mine CHARACTERISTICS OF TAILINGS SAND composition
| Fe 2O 3（%） | Al 2O 3（%） | SiO 2（%） | SO 3（%） | CaO（%） | K 2O（%） | Na 2O（%） |
| 11.16 | 14.20 | 44.72 | 3.46 | 6.39 | 0.50 | 4.92 |
As shown in Table 1, compared to other mine tailings, South Mountain CHARACTERISTICS OF TAILINGS SAND belongs to a kind of high-sulfur Low-silica iron ore tailings, the content of sulphur, considerably beyond the requirement of " building sand " standard medium sulphide content and ferrous sulfate content < 0.5%, becomes the critical technical barrier that restriction Nanshan Mine iron milltailings utilizes; It is up to standard that radiological measuring result shows this iron milltailings radioactivity, and this CHARACTERISTICS OF TAILINGS SAND can be applicable to building materials field.
2, iron tailings efficient separation reclaims valuable component
Extract for the low silicon tailings of this type of high-sulfur and wherein have valency component iron concentrate and iron ore concentrate, adopt 60 ~ 80 object sieves to sieve, sieve upper part accounts for 70%, and lower part of screen is divided and accounted for 30%.For the lower thin tailings of sieve, carry out floatation desulphurization enrichment iron concentrate, the thin tailings after desulfurization is by high intensity magnetic separation deironing, and the thin tailings after desulfurization and deferrization carries out by physico-chemical process activations and prepares unburned mine tailings admixture.
3, sieve upper part to utilize
Sieve upper part is about the thick tailings of 70%, wherein sulfur content is less than 1% by analysis, it substitutes 50 ~ 60% river sand preparation standard mortars, 3d, 7d, 28d intensity is suitable with standard mortar intensity, is not had the phenomenon of swelling cracking by long-term observation, preliminary judgement can as building sand, for building material.
4, utilization is divided in lower part of screen
Lower part of screen is divided and is about 30% for thin mine tailing, sulfur content is 9.62%, iron content is 16.28%, the iron concentrate accounting for former iron milltailings quality 6.14% can be selected by floatation desulphurization, its sulphur grade can reach 44.65%, the iron concentrate selected may be used for sulfuric acid plant and prepares sulfuric acid, and after Sulphuric acid, remaining high scum Iron grade reaches 63%, and iron concentrate and high scum can sell as product.24.6% fine sand selecting sulphur later, iron is selected by high intensity magnetic separation technology, select iron to remain the high tailings of 7.14% silicone content later, wherein silicone content is 61.29%, this part through mechanochemical reaction stimulating activity, then grinding (mechanical activation), prepare highly active unburned mine tailings admixture, directly can do product to sell, for concrete microfine mineral admixture or prepare finished cement for cement mixture, also inner utilization can do the raw material of air-entrained concrete building block or premixing dry-mixed mortar; The tailings that 17.47% iron content that high intensity magnetic separation sub-elects is high, wherein iron content is 20.12%, and this part tailings can directly as the raw material cement baking in cement plant.
Claims (1)
1. a stepped utilization method for high-sulfur Low-silica iron ore tailings, for Ma ' anshan City Nanshan Mine iron tailings, iron tailings composition Fe
2o
3: 11.16%; Al
2o
3: 14.20%; SiO
2: 44.72%; SO
3: 3.46%; CaO:6.39%; K
2o:0.50%; Na
2o:4.92%, its characterization step is: 1, adopt 60 ~ 80 object sieves to sieve, and sieve upper part accounts for 70%, and lower part of screen is divided and accounted for 30%; 2, sieve upper part to utilize: sieve upper part is about the thick tailings of 70%, and wherein sulfur content is less than 1%, and it substitutes 50 ~ 60% river sand preparation standard mortars; 3, utilization is divided in lower part of screen: lower part of screen is divided and is about 30% for thin mine tailing, and sulfur content is 9.62%, and iron content is 16.28%; The iron concentrate accounting for former iron milltailings quality 6.14% can be selected by floatation desulphurization, its sulphur grade can reach 44.65%, the iron concentrate selected can be used for preparing sulfuric acid, and after Sulphuric acid, remaining high scum Iron grade reaches 63%, and iron concentrate and high scum can sell as product; 24.6% fine sand selecting sulphur later, iron is selected by high intensity magnetic separation technology, select iron to remain the high tailings of 7.14% silicone content later, wherein silicone content is 61.29%, this part, through mechanochemical reaction stimulating activity, prepares highly active unburned mine tailings admixture, directly can do product and sell, for concrete microfine mineral admixture or prepare finished cement for cement mixture, also inner utilization the raw material of air-entrained concrete building block or premixing dry-mixed mortar can be done; The tailings that 17.47% iron content that high intensity magnetic separation sub-elects is high, wherein iron content is 20.12%, and this part tailings can directly as the raw material cement baking in cement plant.
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| CN104117524A (en) * | 2014-05-28 | 2014-10-29 | 郑祥余 | Method for recycling iron tailing sand |
| CN107298561B (en) * | 2017-07-28 | 2019-07-23 | 大连地拓环境科技有限公司 | A kind of iron tailings barren rock resource utilization method |
| CN108191336A (en) * | 2018-01-21 | 2018-06-22 | 李肇炯 | A kind of metal tail slag regeneration benefit clay and its production method |
| CN108892462A (en) * | 2018-07-23 | 2018-11-27 | 中煤地质工程有限公司北京水工环地质勘查院 | A method of high-strength concrete is prepared using granite barren rock and Low-silica iron ore tailings |
| CN109647617B (en) * | 2018-12-28 | 2021-09-07 | 江西省宜丰万国矿业有限公司 | Method for extracting iron and reducing sulfur from nonferrous metal underground mine tailings |
| CN110342845B (en) * | 2019-06-19 | 2022-02-18 | 张晓夫 | Method for manufacturing sand by using iron tailing slag |
| CN112756103B (en) * | 2020-11-27 | 2022-09-13 | 泗水惠丰农业开发工程有限公司 | Method for processing fine sand by mixing iron tailings and crusher-made sand |
| CN113968704A (en) * | 2021-11-10 | 2022-01-25 | 湖南绿生永固新材料有限公司 | Method for preparing baking-free brick by using iron tailings and waste residues |
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