CN102659360B - Iron tailing steam curing brick and preparation method thereof - Google Patents
Iron tailing steam curing brick and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of iron tailing treatment, in particular to an iron tailing steam curing brick and a preparation method thereof. The iron tailing steam curing brick is characterized by being prepared from the following raw materials in percentage by weight: 65-85 percent of activated iron tailings, 9-27 percent of river sand and 4-8 percent of ordinary silicate cement, gypsum and water wherein the sum of the weight percent of the iron tailings, the river sand and the ordinary silicate cement is 100 percent; the adding amount of gypsum is 2 percent of the total mass of the activated iron tailings, the river sand and the ordinary silicate cement; and the adding amount of water is 8 percent of the total mass of the activated iron tailings, the river sand , the ordinary silicate cement and gypsum. Due to the adoption of the iron tailing steam curing brick, the problems of high cement using amount and high cost caused by the adoption of iron tailings serving as a major raw material for preparing a building material, and secondary pollution caused by recovery of iron ore concentrate are solved.
Description
Technical field
The present invention relates to iron ore mine processing technology field, be specifically related to a kind of steamed brick that iron ore mine makes and preparation method thereof that utilizes.
Background technology
Along with the rapid growth of steel industry, increasing to the demand of iron ore, the mine tailing that iron ore beneficiation produces is also more and more.Mine tailing has not only taken a large amount of valuable land resources, and near tailing dam cities and towns also exists security threat, even if once occur that away from the tailing dam of Residential areas accident also can cause huge pollution to environment.Therefore the problem that, how to turn waste into wealth and become people more and more to pay close attention to iron ore mine recycling.
Along with China's rapid development of economy, the demand of iron and steel is also day by day soaring, the concern that is more and more subject to people take iron ore mine etc. as a large amount of industrial waste of form bringing therefrom.These industrial wastes have not only taken a large amount of land resources, have polluted environment, also exist certain potential safety hazard, and urgent need will drop into sizable energy and go to recover and administer.Simultaneously, in order to change the medium-term and long-term way that this large amount of waste land resources, destruction are ploughed take clay as raw material production vitrified brick of China's building material industry, China forbade producing, using and selling solid clay brick in 30 days June in 2003, and advocated research and use industrial waste as building material.So, a lot of scholars take up research and utilization iron ore mine and prepare various material of construction as filler, if publication number is CN 101786859 A(iron tailing baked brick and preparation method thereof), CN 101182141 A (a kind of method of utilizing iron tailings to prepare high strength structure material), the method of CN 1887770 A(take iron tailings as raw material production vitrified brick), CN 101725206 A(iron ore tailing wall body autoclaved brick and preparation method thereof) and CN 1727301 A(prepared from tailing sand of iron ore buring free, steaming free bearing building blocks or brick and manufacturing process thereof) etc. patent documentation.
But the disclosed preparation method of above-mentioned patent documentation, because cement, aggregate consumption are large, causes high cost, lack the market competitiveness, its basic reason is iron ore mine fine size, belongs to typical nonactive mineral material, does not possess pozzolanic activity.Therefore, use utilizing iron ore mine can only be used as inert filler in preparing the process of various material of construction, addition is generally little, is difficult to really reach the object of a large amount of consumption iron ore mines.Meanwhile, in resource day by day deficient today, a lot of scholars have also studied iron ore mine have been carried out after certain art breading, ore dressing is reclaimed and is obtained iron ore concentrate again, but also brought secondary mine tailing, caused secondary pollution, do not reached the object of utilizing iron ore mine completely simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of iron ore mine steamed brick and preparation method thereof, solve and take iron ore mine as main raw material, prepare at present that material of construction cement consumption is large, cost is high, and again reclaim the problem of the secondary pollution that iron ore concentrate brings.
In order to achieve the above object, technical scheme of the present invention is achieved in that a kind of iron ore mine steamed brick, it is characterized in that it is prepared from by the iron ore mine activating, river sand, ordinary Portland cement, gypsum and water, each feed composition by weight percentage ratio is: the iron ore mine 65～85% of activation, river sand 9～27%, ordinary Portland cement 4～8%, and the shared weight percentage sum of iron ore mine, river sand and ordinary Portland cement of activation is 100%; The add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%; Water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%.
Being prepared as of the iron ore mine of described activation: 1. activation treatment: iron ore mine is carried out to press filtration, dry, calcining, dry method quenching, obtain the iron ore mine after activation treatment; 2. magnetic separation: above-mentioned iron ore mine after activation treatment, by dry-type magnetic extractor, is isolated to iron ore concentrate wherein, and surplus materials is the iron ore mine for activating both.
River sand size distribution used is 0.6～4.75mm.
The preparation method of above-mentioned a kind of iron ore mine steamed brick, is characterized in that it comprises the following steps:
1) preparation of the iron ore mine of activation:
1. activation treatment: iron ore mine is carried out to press filtration, dry, calcining, dry method quenching, obtain the iron ore mine after activation treatment;
2. magnetic separation: above-mentioned iron ore mine after activation treatment, by dry-type magnetic extractor, is isolated to iron ore concentrate wherein, and surplus materials is the iron ore mine for activating both;
2) batching and mix: by each feed composition by weight percentage ratio be: the iron ore mine 65～85% of activation, river sand 9～27%, ordinary Portland cement 4～8%, the shared weight percentage sum of iron ore mine, river sand and ordinary Portland cement of activation is 100%, chooses iron ore mine, river sand and the ordinary Portland cement of activation; By the add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%, choose gypsum; By water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%, choose water;
The iron ore mine of activation, river sand, ordinary Portland cement and gypsum are first dry mixed to 10 minutes, after add water mix and blend 10 minutes, the slip that obtains mixing;
3) moulding: the slip mixing adopts compression moulding, and forming pressure 20～30MPa, obtains adobe;
4) maintenance: adobe that moulding is obtained is first that 25～30 ℃, relative humidity are not less than 90%(and are generally 90%～95% in temperature) condition under maintenance one day, then at 90 ℃ of temperature steam-cured one day, wet curing five days at room temperature again, obtains iron ore mine steamed brick (finished product).
Press filtration in described activation treatment, is to remove the water in iron ore mine with pressure filter, and iron ore mine obtains through press filtration processing the tailing cake that water ratio is 17～18wt%;
Being dried in described activation treatment, is the water ratio that further reduces tailing cake, is convenient to next step calcining, and the dry methods such as heating, infrared radiation of can passing through realize, and dried tailing cake water ratio is lower than 5wt%, and product is for being dried mine tailing;
Calcining in described activation treatment, is to mix the coal dust that accounts for dry mine tailing total mass 2～6%, at 600～700 ℃ of temperature, calcines, temperature rise rate is 15～20 ℃/min, the object of adding coal dust is to keep weakly reducing atmosphere, calcination time 1 hour, the mine tailing after being calcined;
Dry method quenching in described activation treatment, is by cooling rapidly in fluidizing air the mine tailing after calcining, and realizes gas solid separation; Cooled iron ore mine carries out ore dressing again with dry magnetic separation, selects the magnetite forming in calcining and activating process as iron ore concentrate, and the resistates after ore dressing is the iron ore mine for activating both.
The invention has the beneficial effects as follows: first iron ore mine is carried out to activation treatment, make spathic iron ore contained in iron ore mine and rhombohedral iron ore be converted into the magnetic magnetite of tool, can be reclaimed by magnetic separation like this, again as iron and steel raw material.Meanwhile, through high-temperature calcination, the pozzolanic activity of silicoide contained in iron ore mine and aluminium matter mineral is improved significantly, therefore can reduce the consumption of cement while making iron ore mine steamed brick or in the situation that adding equal cement amount, put forward iron ore mine steamed brick intensity, and thoroughly solved in prior art the problem that reclaims the secondary pollution that iron ore concentrate brings because of activation treatment iron ore mine, reach the object of efficient, economy, recycling iron ore mine.Cement consumption of the present invention little (ordinary Portland cement 4～8%), cost are low.
Embodiment
In order to understand better the present invention, below in conjunction with embodiment, further illustrate content of the present invention, but content of the present invention is not only confined to the following examples.
Embodiment 1:
A kind of iron ore mine steamed brick and preparation method thereof, it comprises the following steps:
Take the iron ore mine of meishan iron mine as raw material, prepare iron ore mine steamed brick,
1) preparation of the iron ore mine of activation: be first that its (iron ore mine of meishan iron mine) carried out to activation treatment and select the magnetite forming in reactivation process with dry magnetic separation.1. the concrete technology of activation treatment is as follows:
Press filtration and dry: iron ore mine ore pulp is dewatered with filtering equipment (using plate and frame(type)filter press herein), iron ore mine obtains through press filtration processing the tailing cake that water ratio is 17wt%; Tailing cake is put into baking oven and with 110 ℃, be dried 8 hours, dry mine tailing water ratio 3wt%, obtains dry mine tailing.
Calcining and dry method quenching (cooling): dry mine tailing is mixed to the coal (coal dust) of its quality 2%, mix, calcine 1 hour at 700 ℃, temperature rise rate is 15 ℃/min, the mine tailing after being calcined; Rapidly that it is cooling with fluidizing air after taking-up, and realize gas solid separation by the mode of gathering dust.
2. magnetic separation: by carrying out dry magnetic separation through the cooling iron ore mine of calcining, isolate iron ore concentrate wherein, remaining material had been both the iron ore mine (or claiming activation iron ore mine) for the preparation of the activation of iron ore mine air-entrained concrete building block.
It is generally acknowledged, as material its SiO in basic solution of cement products filler
2and Al
2o
3solubility rate is higher, and the pozzolanic activity of this material is just higher.By light-intensity method, measured respectively in this example the SiO that does not calcine iron ore mine, calcines postactivated iron ore mine
2and Al
2o
3solubility rate.For not calcining iron ore mine SiO
2solubility rate is 5.4%, Al
2o
3solubility rate is 4.6%, and calcines the SiO of postactivated iron ore mine
2and Al
2o
3solubility rate has improved respectively 17.2% and 4.6%, illustrates to calcine really to have played the effect that improves iron ore mine pozzolanic activity.
2) batching and mixing: by each feed composition by weight percentage ratio be: iron ore mine 65%, the river sand 27%(size distribution of activation are 0.6～4.75 mm), ordinary Portland cement 8%, choose iron ore mine, river sand and the ordinary Portland cement of activation; By the add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%, choose gypsum; By water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%, choose water;
The iron ore mine of activation, river sand, ordinary Portland cement and gypsum are first dry mixed to 10 minutes, after add water mix and blend 10 minutes, the slip that obtains mixing;
3) moulding: the slip mixing adopts compression moulding, and forming pressure 25MPa, obtains adobe;
4) maintenance: adobe that moulding is obtained is first maintenance one day under 25 ℃, the relative humidity condition that is 90% in temperature, then at 90 ℃ of temperature steam-cured one day, then wet curing five days at room temperature, obtain iron ore mine steamed brick (finished product).
Prepared iron ore mine steamed brick is carried out to strength test according to the non-sintering rubbish of JC/T 422-2007 < < tailing-bricks > > standard, the mean value of its ultimate compression strength is 23.4MPa, has exceeded the requirement of strength of MU-20.In order to contrast, with not calcining iron ore mine, be that raw material has been prepared steamed brick with same proportioning and technique, recording its ultimate compression strength mean value is 16.1MPa, has only reached the requirement of strength of MU-15.Show thus, the iron ore mine steamed brick that adopts the iron ore mine of the activation through calcining to make under same proportioning and equal processing condition, will improve much than the ultimate compression strength of the steamed brick making with the iron ore mine of not calcining.Ordinary Portland cement 8%, illustrates that cement consumption of the present invention is little, cost is low.
Embodiment 2:
A kind of iron ore mine steamed brick and preparation method thereof, it comprises the following steps:
Take the iron ore mine of meishan iron mine as raw material, prepare iron ore mine steamed brick,
1) preparation of the iron ore mine of activation: be first that its (iron ore mine of meishan iron mine) carried out to activation treatment and select the magnetite forming in reactivation process with dry magnetic separation.1. the concrete technology of activation treatment is as follows:
Press filtration and dry: can carry out with reference to the step in embodiment 1.
Calcining and dry method quenching (cooling): dry mine tailing is mixed to the coal (coal dust) of its quality 4%, mix, calcine 1 hour at 700 ℃, temperature rise rate is 20 ℃/min, the mine tailing after being calcined; Rapidly that it is cooling with fluidizing air after taking-up, and realize gas solid separation by the mode of gathering dust.
2. magnetic separation: by carrying out dry magnetic separation through the cooling iron ore mine of calcining, isolate iron ore concentrate wherein, remaining material had been both the iron ore mine (or claiming activation iron ore mine) for the preparation of the activation of iron ore mine air-entrained concrete building block.
By light-intensity method, measured respectively in this example the SiO of the iron ore mine of not calcining the activation after iron ore mine, calcining
2and Al
2o
3solubility rate.For not calcining iron ore mine SiO
2solubility rate is 5.4%, Al
2o
3solubility rate is 4.6%, and the SiO of iron ore mine of activation after calcining
2and Al
2o
3solubility rate has improved respectively 23.8% and 5.7%.
2) batching and mixing: by each feed composition by weight percentage ratio be: iron ore mine 75%, the river sand 19%(size distribution of activation are 0.6～4.75 mm), ordinary Portland cement 6%, choose iron ore mine, river sand and the ordinary Portland cement of activation; By the add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%, choose gypsum; By water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%, choose water;
The iron ore mine of activation, river sand, ordinary Portland cement and gypsum are first dry mixed to 10 minutes, after add water mix and blend 10 minutes, the slip that obtains mixing;
3) moulding: the slip mixing adopts compression moulding, and forming pressure 20MPa, obtains adobe;
4) maintenance: adobe that moulding is obtained is first maintenance one day under 30 ℃, the relative humidity condition that is 95% in temperature, then at 90 ℃ of temperature steam-cured one day, then wet curing five days at room temperature, obtain iron ore mine steamed brick (finished product).
Prepared iron ore mine steamed brick is carried out to strength test according to the non-sintering rubbish of JC/T 422-2007 < < tailing-bricks > > standard, the mean value of its ultimate compression strength is 21.5MPa, has exceeded the requirement of strength of MU-20.In order to contrast, with not calcining iron ore mine, be that raw material has been prepared steamed brick with same proportioning and technique, recording its ultimate compression strength mean value is 13.1MPa, lower than the requirement of strength of MU-15.Ordinary Portland cement 6%, illustrates that cement consumption of the present invention is little, cost is low.
Embodiment 3:
A kind of iron ore mine steamed brick and preparation method thereof, it comprises the following steps:
Take the iron ore mine of meishan iron mine as raw material, prepare iron ore mine steamed brick,
1) preparation of the iron ore mine of activation: be first that its (iron ore mine of meishan iron mine) carried out to activation treatment and select the magnetite forming in reactivation process with dry magnetic separation.1. the concrete technology of activation treatment is as follows:
Press filtration and dry: can carry out with reference to the step in embodiment 1.
Calcining and dry method quenching (cooling): dry mine tailing is mixed to the coal (coal dust) of its quality 6%, mix, calcine 1 hour at 700 ℃, temperature rise rate is 18 ℃/min, the mine tailing after being calcined; Rapidly that it is cooling with fluidizing air after taking-up, and realize gas solid separation by the mode of gathering dust.
2. magnetic separation: by carrying out dry magnetic separation through the cooling iron ore mine of calcining, isolate iron ore concentrate wherein, remaining material had been both the iron ore mine (or claiming activation iron ore mine) for the preparation of the activation of iron ore mine air-entrained concrete building block.
By light-intensity method, measured respectively in this example the SiO of the iron ore mine of not calcining the activation after iron ore mine, calcining
2and Al
2o
3solubility rate.For not calcining iron ore mine SiO
2solubility rate is 5.4%, Al
2o
3solubility rate is 4.6%, and the SiO of iron ore mine of activation after calcining
2and Al
2o
3solubility rate has improved respectively 33.1% and 10.1%.
2) batching and mixing: by each feed composition by weight percentage ratio be: iron ore mine 85%, the river sand 11%(size distribution of activation are 0.6～4.75 mm), ordinary Portland cement 4%, choose iron ore mine, river sand and the ordinary Portland cement of activation; By the add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%, choose gypsum; By water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%, choose water;
The iron ore mine of activation, river sand, ordinary Portland cement and gypsum are first dry mixed to 10 minutes, after add water mix and blend 10 minutes, the slip that obtains mixing;
3) moulding: the slip mixing adopts compression moulding, and forming pressure 30MPa, obtains adobe;
4) maintenance: adobe that moulding is obtained is first maintenance one day under 25 ℃, the relative humidity condition that is 92% in temperature, then at 90 ℃ of temperature steam-cured one day, then wet curing five days at room temperature, obtain iron ore mine steamed brick (finished product).
Prepared iron ore mine steamed brick is carried out to strength test according to the non-sintering rubbish of JC/T 422-2007 < < tailing-bricks > > standard, the mean value of its ultimate compression strength is 22.6MPa, has exceeded the requirement of strength of MU-20.In order to contrast, with not calcining iron ore mine, be that raw material has been prepared steamed brick with same proportioning and technique, recording its ultimate compression strength mean value is 10.5MPa, lower than the requirement of strength of MU-15.
Embodiment 4:
A kind of iron ore mine steamed brick and preparation method thereof, it comprises the following steps:
Take the iron ore mine of meishan iron mine as raw material, prepare iron ore mine steamed brick,
1) preparation of the iron ore mine of activation: be first that its (iron ore mine of meishan iron mine) carried out to activation treatment and select the magnetite forming in reactivation process with dry magnetic separation.1. the concrete technology of activation treatment is as follows:
Press filtration and dry: can carry out with reference to the step in embodiment 1.
Calcining and dry method quenching (cooling): dry mine tailing is mixed to the coal (coal dust) of its quality 2%, mix, calcine 1 hour at 600 ℃, temperature rise rate is 20 ℃/min, the mine tailing after being calcined; Rapidly that it is cooling with fluidizing air after taking-up, and realize gas solid separation by the mode of gathering dust.
2. magnetic separation: by carrying out dry magnetic separation through the cooling iron ore mine of calcining, isolate iron ore concentrate wherein, remaining material had been both the iron ore mine (or claiming activation iron ore mine) for the preparation of the activation of iron ore mine air-entrained concrete building block.
By light-intensity method, measured respectively in this example the SiO of the iron ore mine of not calcining the activation after iron ore mine, calcining
2and Al
2o
3solubility rate.For not calcining iron ore mine SiO
2solubility rate is 5.4%, Al
2o
3solubility rate is 4.6%, and the SiO of iron ore mine of activation after calcining
2and Al
2o
3solubility rate has improved respectively 3.5% and 2.4%.
2) batching and mixing: by each feed composition by weight percentage ratio be: iron ore mine 65%, the river sand 27%(size distribution of activation are 0.6～4.75 mm), ordinary Portland cement 8%, choose iron ore mine, river sand and the ordinary Portland cement of activation; By the add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%, choose gypsum; By water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%, choose water;
The iron ore mine of activation, river sand, ordinary Portland cement and gypsum are first dry mixed to 10 minutes, after add water mix and blend 10 minutes, the slip that obtains mixing;
3) moulding: the slip mixing adopts compression moulding, and forming pressure 25MPa, obtains adobe;
4) maintenance: adobe that moulding is obtained is first maintenance one day under 30 ℃, the relative humidity condition that is 90% in temperature, then at 90 ℃ of temperature steam-cured one day, then wet curing five days at room temperature, obtain iron ore mine steamed brick (finished product).
Prepared iron ore mine steamed brick is carried out to strength test according to the non-sintering rubbish of JC/T 422-2007 < < tailing-bricks > > standard, the mean value of its ultimate compression strength is 21.8MPa, has exceeded the requirement of strength of MU-20.In order to contrast, with not calcining iron ore mine, be that raw material has been prepared steamed brick with same proportioning and technique, recording its ultimate compression strength mean value is 16.1MPa, has only reached the requirement of strength of MU-15.
Embodiment 5:
A kind of iron ore mine steamed brick and preparation method thereof, it comprises the following steps:
Take the iron ore mine of meishan iron mine as raw material, prepare iron ore mine steamed brick,
1) preparation of the iron ore mine of activation: be first that its (iron ore mine of meishan iron mine) carried out to activation treatment and select the magnetite forming in reactivation process with dry magnetic separation.1. the concrete technology of activation treatment is as follows:
Press filtration and dry: can carry out with reference to the step in embodiment 1.
Calcining and dry method quenching (cooling): dry mine tailing is mixed to the coal (coal dust) of its quality 4%, mix, calcine 1 hour at 600 ℃, temperature rise rate is 15 ℃/min, the mine tailing after being calcined; Rapidly that it is cooling with fluidizing air after taking-up, and realize gas solid separation by the mode of gathering dust.
2. magnetic separation: by carrying out dry magnetic separation through the cooling iron ore mine of calcining, isolate iron ore concentrate wherein, remaining material had been both the iron ore mine (or claiming activation iron ore mine) for the preparation of the activation of iron ore mine air-entrained concrete building block.
By light-intensity method, measured respectively in this example the SiO of the iron ore mine of not calcining the activation after iron ore mine, calcining
2and Al
2o
3solubility rate.For not calcining iron ore mine SiO
2solubility rate is 5.4%, Al
2o
3solubility rate is 4.6%, and the SiO of iron ore mine of activation after calcining
2and Al
2o
3solubility rate has improved respectively 6.1% and 7.6%.
2) batching and mixing: by each feed composition by weight percentage ratio be: iron ore mine 75%, the river sand 21%(size distribution of activation are 0.6～4.75 mm), ordinary Portland cement 4%, choose iron ore mine, river sand and the ordinary Portland cement of activation; By the add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%, choose gypsum; By water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%, choose water;
The iron ore mine of activation, river sand, ordinary Portland cement and gypsum are first dry mixed to 10 minutes, after add water mix and blend 10 minutes, the slip that obtains mixing;
3) moulding: the slip mixing adopts compression moulding, and forming pressure 30MPa, obtains adobe;
4) maintenance: adobe that moulding is obtained is first maintenance one day under 30 ℃, the relative humidity condition that is 95% in temperature, then at 90 ℃ of temperature steam-cured one day, then wet curing five days at room temperature, obtain iron ore mine steamed brick (finished product).
Prepared iron ore mine steamed brick is carried out to strength test according to the non-sintering rubbish of JC/T 422-2007 < < tailing-bricks > > standard, the mean value of its ultimate compression strength is 16.4MPa, has reached the requirement of strength of MU-15.In order to contrast, with not calcining iron ore mine, be that raw material has been prepared steamed brick with same proportioning and technique, recording its ultimate compression strength mean value is 9.9MPa, lower than the requirement of strength of MU-15.
Embodiment 6:
A kind of iron ore mine steamed brick and preparation method thereof, it comprises the following steps:
Take the iron ore mine of meishan iron mine as raw material, prepare iron ore mine steamed brick,
1) preparation of the iron ore mine of activation: be first that its (iron ore mine of meishan iron mine) carried out to activation treatment and select the magnetite forming in reactivation process with dry magnetic separation.1. the concrete technology of activation treatment is as follows:
Press filtration and dry: can carry out with reference to the step in embodiment 1.
Calcining and dry method quenching (cooling): dry mine tailing is mixed to the coal (coal dust) of its quality 6%, mix, calcine 1 hour at 600 ℃, temperature rise rate is 15 ℃/min, the mine tailing after being calcined; Rapidly that it is cooling with fluidizing air after taking-up, and realize gas solid separation by the mode of gathering dust.
2. magnetic separation: by carrying out dry magnetic separation through the cooling iron ore mine of calcining, isolate iron ore concentrate wherein, remaining material had been both the iron ore mine (or claiming activation iron ore mine) for the preparation of the activation of iron ore mine air-entrained concrete building block.
By light-intensity method, measured respectively in this example the SiO of the iron ore mine of not calcining the activation after iron ore mine, calcining
2and Al
2o
3solubility rate.For not calcining iron ore mine SiO
2solubility rate is 5.4%, Al
2o
3solubility rate is 4.6%, and the SiO of iron ore mine of activation after calcining
2and Al
2o
3solubility rate has improved respectively 8.4% and 8.8%.
2) batching and mixing: by each feed composition by weight percentage ratio be: iron ore mine 85%, the river sand 9%(size distribution of activation are 0.6～4.75 mm), ordinary Portland cement 6%, choose iron ore mine, river sand and the ordinary Portland cement of activation; By the add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%, choose gypsum; By water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%, choose water;
The iron ore mine of activation, river sand, ordinary Portland cement and gypsum are first dry mixed to 10 minutes, after add water mix and blend 10 minutes, the slip that obtains mixing;
3) moulding: the slip mixing adopts compression moulding, and forming pressure 30MPa, obtains adobe;
4) maintenance: adobe that moulding is obtained is first maintenance one day under 25 ℃, the relative humidity condition that is 92% in temperature, then at 90 ℃ of temperature steam-cured one day, then wet curing five days at room temperature, obtain iron ore mine steamed brick (finished product).
Prepared iron ore mine steamed brick is carried out to strength test according to the non-sintering rubbish of JC/T 422-2007 < < tailing-bricks > > standard, the mean value of its ultimate compression strength is 19.6MPa, has obviously exceeded the requirement of strength of MU-15.In order to contrast, with not calcining iron ore mine, be that raw material has been prepared steamed brick with same proportioning and technique, recording its ultimate compression strength mean value is 12.6MPa, lower than the requirement of strength of MU-15.
Embodiment 7:
A kind of iron ore mine steamed brick and preparation method thereof, it comprises the following steps:
Take the iron ore mine of meishan iron mine as raw material, prepare iron ore mine steamed brick,
1) preparation of the iron ore mine of activation: be first that its (iron ore mine of meishan iron mine) carried out to activation treatment and select the magnetite forming in reactivation process with dry magnetic separation.1. the concrete technology of activation treatment is as follows:
Press filtration and dry: can carry out with reference to the step in embodiment 1.
Calcining and dry method quenching (cooling): dry mine tailing is mixed to the coal (coal dust) of its quality 4%, mix, calcine 1 hour at 700 ℃, temperature rise rate is 18 ℃/min, the mine tailing after being calcined; Rapidly that it is cooling with fluidizing air after taking-up, and realize gas solid separation by the mode of gathering dust.
2. magnetic separation: by carrying out dry magnetic separation through the cooling iron ore mine of calcining, isolate iron ore concentrate wherein, remaining material had been both the iron ore mine for the preparation of the activation of iron ore mine air-entrained concrete building block.
By light-intensity method, measured respectively in this example the SiO of the iron ore mine (calcining postactivated iron ore mine) of not calcining iron ore mine, activation
2and Al
2o
3solubility rate.For not calcining iron ore mine SiO
2solubility rate is 5.4%, Al
2o
3solubility rate is 4.6%, and calcines the SiO of postactivated iron ore mine
2and Al
2o
3solubility rate has improved respectively 23.8% and 5.7%.
2) batching and mixing: by each feed composition by weight percentage ratio be: iron ore mine 70%, the river sand 24%(size distribution of activation are 0.6～4.75 mm), ordinary Portland cement 6%, choose iron ore mine, river sand and the ordinary Portland cement of activation; By the add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%, choose gypsum; By water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%, choose water;
The iron ore mine of activation, river sand, ordinary Portland cement and gypsum are first dry mixed to 10 minutes, after add water mix and blend 10 minutes, the slip that obtains mixing;
3) moulding: the slip mixing adopts compression moulding, and forming pressure 25MPa, obtains adobe;
4) maintenance: adobe that moulding is obtained is first maintenance one day under 30 ℃, the relative humidity condition that is 91% in temperature, then at 90 ℃ of temperature steam-cured one day, then wet curing five days at room temperature, obtain iron ore mine steamed brick (finished product).
Prepared iron ore mine steamed brick is carried out to strength test according to the non-sintering rubbish of JC/T 422-2007 < < tailing-bricks > > standard, the mean value of its ultimate compression strength is 22.9MPa, has exceeded the requirement of strength of MU-20.In order to contrast, with not calcining iron ore mine, be that raw material has been prepared steamed brick with same proportioning and technique, recording its ultimate compression strength mean value is 13.9MPa, lower than the requirement of strength of MU-15.
Embodiment 8:
A kind of iron ore mine steamed brick and preparation method thereof, it comprises the following steps:
Take the iron ore mine of meishan iron mine as raw material, prepare iron ore mine steamed brick,
1) preparation of the iron ore mine of activation: be first that its (iron ore mine of meishan iron mine) carried out to activation treatment and select the magnetite forming in reactivation process with dry magnetic separation.1. the concrete technology of activation treatment is as follows:
Press filtration and dry: remove the water in iron ore mine with pressure filter, iron ore mine obtains through press filtration processing the tailing cake that water ratio is 18wt%; Be dried with infrared-far-infrared dryer, dried tailing cake water ratio is 4.5wt%, and product is dry mine tailing.
Calcining and dry method quenching (cooling): dry mine tailing is mixed to the coal (coal dust) of its quality 6%, mix, calcine 1 hour at 600 ℃, temperature rise rate is 15 ℃/min, the mine tailing after being calcined; Rapidly that it is cooling with fluidizing air after taking-up, and realize gas solid separation by the mode of gathering dust.
2. magnetic separation: by carrying out dry magnetic separation through the cooling iron ore mine of calcining, isolate iron ore concentrate wherein, remaining material had been both the iron ore mine for the preparation of the activation of iron ore mine air-entrained concrete building block.
By light-intensity method, measured respectively in this example the SiO of the iron ore mine of not calcining the activation after iron ore mine, calcining
2and Al
2o
3solubility rate.For not calcining iron ore mine SiO
2solubility rate is 5.4%, Al
2o
3solubility rate is 4.6%, and the SiO of iron ore mine of activation after calcining
2and Al
2o
3solubility rate has improved respectively 8.4% and 8.8%.
2) batching and mixing: by each feed composition by weight percentage ratio be: iron ore mine 70%, the river sand 22%(size distribution of activation are 0.6～4.75 mm), ordinary Portland cement 8%, choose iron ore mine, river sand and the ordinary Portland cement of activation; By the add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%, choose gypsum; By water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%, choose water;
The iron ore mine of activation, river sand, ordinary Portland cement and gypsum are first dry mixed to 10 minutes, after add water mix and blend 10 minutes, the slip that obtains mixing;
3) moulding: the slip mixing adopts compression moulding, and forming pressure 25MPa, obtains adobe;
4) maintenance: adobe that moulding is obtained is first maintenance one day under 25 ℃, the relative humidity condition that is 90% in temperature, then at 90 ℃ of temperature steam-cured one day, then wet curing five days at room temperature, obtain iron ore mine steamed brick (finished product).
Prepared iron ore mine steamed brick is carried out to strength test according to the non-sintering rubbish of JC/T 422-2007 < < tailing-bricks > > standard, the mean value of its ultimate compression strength is 22.1MPa, has exceeded the requirement of strength of MU-20.In order to contrast, with not calcining iron ore mine, be that raw material has been prepared steamed brick with same proportioning and technique, recording its ultimate compression strength mean value is 15.8MPa, has only reached the requirement of strength of MU-15.
Bound value and the interval value of the cited each processing parameter (as temperature, pressure, time) of the present invention, can realize the present invention, at this, do not enumerate embodiment.
Claims (3)
1. an iron ore mine steamed brick, it is characterized in that it is prepared from by the iron ore mine activating, river sand, ordinary Portland cement, gypsum and water, each feed composition by weight percentage ratio is: the iron ore mine 65～85% of activation, river sand 9～27%, ordinary Portland cement 4～8%, and the shared weight percentage sum of iron ore mine, river sand and ordinary Portland cement of activation is 100%; The add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%; Water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%;
Being prepared as of the iron ore mine of described activation: 1. activation treatment: iron ore mine is carried out to press filtration, dry, calcining, dry method quenching, obtain the iron ore mine after activation treatment; 2. magnetic separation: above-mentioned iron ore mine after activation treatment, by dry-type magnetic extractor, is isolated to iron ore concentrate wherein, and surplus materials is the iron ore mine for activating both;
Press filtration in described activation treatment, is to remove the water in iron ore mine with pressure filter, and iron ore mine obtains through press filtration processing the tailing cake that water ratio is 17～18wt%;
Being dried in described activation treatment, dry by heating, the realization of infrared radiation method, dried tailing cake water ratio is lower than 5wt%, and product is dry mine tailing;
Calcining in described activation treatment, is to mix the coal dust that accounts for dry mine tailing total mass 2～6%, at 600～700 ℃ of temperature, calcines, and temperature rise rate is 15～20 ℃/min, calcination time 1 hour, the mine tailing after being calcined;
Dry method quenching in described activation treatment, is by cooling rapidly in fluidizing air the mine tailing after calcining, and realizes gas solid separation.
2. a kind of iron ore mine steamed brick according to claim 1, is characterized in that: river sand size distribution used is 0.6～4.75mm.
3. prepare a method for iron ore mine steamed brick as claimed in claim 1, it is characterized in that it comprises the following steps:
1) preparation of the iron ore mine of activation:
1. activation treatment: iron ore mine is carried out to press filtration, dry, calcining, dry method quenching, obtain the iron ore mine after activation treatment;
2. magnetic separation: above-mentioned iron ore mine after activation treatment, by dry-type magnetic extractor, is isolated to iron ore concentrate wherein, and surplus materials is the iron ore mine for activating both;
Press filtration in described activation treatment, is to remove the water in iron ore mine with pressure filter, and iron ore mine obtains through press filtration processing the tailing cake that water ratio is 17～18wt%;
Being dried in described activation treatment, dry by heating, the realization of infrared radiation method, dried tailing cake water ratio is lower than 5wt%, and product is dry mine tailing;
Calcining in described activation treatment, is to mix the coal dust that accounts for dry mine tailing total mass 2～6%, at 600～700 ℃ of temperature, calcines, and temperature rise rate is 15～20 ℃/min, calcination time 1 hour, the mine tailing after being calcined;
Dry method quenching in described activation treatment, is by cooling rapidly in fluidizing air the mine tailing after calcining, and realizes gas solid separation;
2) batching and mix: by each feed composition by weight percentage ratio be: the iron ore mine 65～85% of activation, river sand 9～27%, ordinary Portland cement 4～8%, the shared weight percentage sum of iron ore mine, river sand and ordinary Portland cement of activation is 100%, chooses iron ore mine, river sand and the ordinary Portland cement of activation; By the add-on of gypsum be activation iron ore mine, river sand and ordinary Portland cement quality summation 2%, choose gypsum; By water add-on be activation iron ore mine, river sand, ordinary Portland cement and gypsum quality summation 8%, choose water;
The iron ore mine of activation, river sand, ordinary Portland cement and gypsum are first dry mixed to 10 minutes, after add water mix and blend 10 minutes, the slip that obtains mixing;
3) moulding: the slip mixing adopts compression moulding, and forming pressure 20～30MPa, obtains adobe;
4) maintenance: adobe that moulding is obtained is first that 25～30 ℃, relative humidity are not less than under 90% condition maintenance one day in temperature, then at 90 ℃ of temperature steam-cured one day, then wet curing five days at room temperature, obtain iron ore mine steamed brick.
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| CN103496933B (en) * | 2013-09-25 | 2015-03-11 | 盐城工学院 | Preparation method of high-ferrosilicon tailing autoclaved brick |
| RU2550754C1 (en) * | 2014-06-16 | 2015-05-10 | Федеральное Государственное Автономное Образовательное Учреждение Высшего Профессионального Образования "Сибирский Федеральный Университет" | Dry construction mixture |
| CN108530015B (en) * | 2018-05-14 | 2021-03-19 | 河南理工大学 | Steam-cured brick manufactured by bauxite tailings and preparation method thereof |
| CN110342845B (en) * | 2019-06-19 | 2022-02-18 | 张晓夫 | Method for manufacturing sand by using iron tailing slag |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1148035A (en) * | 1996-08-19 | 1997-04-23 | 张伟晒 | Method for recovering tailings of iron ore |
| CN101713234A (en) * | 2009-10-30 | 2010-05-26 | 武汉理工大学 | Non-autoclaved and unburned brick and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1148035A (en) * | 1996-08-19 | 1997-04-23 | 张伟晒 | Method for recovering tailings of iron ore |
| CN101713234A (en) * | 2009-10-30 | 2010-05-26 | 武汉理工大学 | Non-autoclaved and unburned brick and preparation method thereof |
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