CN102674427B - Method for producing light calcium carbonate by utilizing calcite - Google Patents
Method for producing light calcium carbonate by utilizing calcite Download PDFInfo
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- CN102674427B CN102674427B CN2012101932659A CN201210193265A CN102674427B CN 102674427 B CN102674427 B CN 102674427B CN 2012101932659 A CN2012101932659 A CN 2012101932659A CN 201210193265 A CN201210193265 A CN 201210193265A CN 102674427 B CN102674427 B CN 102674427B
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- calcination
- calcite
- rotary kiln
- calcium carbonate
- light calcium
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Abstract
The invention provides a method for producing light calcium carbonate by utilizing calcite. The method sequentially comprises a material selecting process, a calcination process, a hydrolyzing process and a carbonizing process, and is characterized in that calcite with the CaO content greater than 54% is selected as a raw material; in the calcination process, a rotary kiln is adopted, and a gas fuel calcination mode is adopted; the calcination process sequentially comprises a preheating stage, a calcination stage and a cooling stage; the preheating stage is performed in a preheater above the kiln tail of the rotary kiln, the preheating temperature is 350-950 DEG C, and the preheating time is 60-120 minutes; the calcination stage is performed in the kiln body of the rotary kiln, the calcination temperature is 950-1150 DEG C, and the calcination time is 40-80 minutes; and the cooling stage is performed in a cooler at the rear end of the rotary kiln. The method provided by the invention has the advantages that continuous production is realized, the production period is short, the degree of automation is high, manpower is greatly reduced, the production efficiency is improved, and the production cost is lowered.
Description
Technical field
The present invention relates to a kind of method of producing light calcium carbonate, mainly is to be the method for raw material production light calcium carbonate with calcite.
Background technology
Prior art is produced light calcium carbonate and is adopted shaft kiln, tunnel furnace etc. more, and present mode of production tradition, produces discontinuously, and level of automation is low, and the production cycle is long.The raw material of producing light calcium carbonate simultaneously mostly is Wingdale, and the Wingdale quality is low, whiteness is poor, and calcining manners adopts multifuel combustion (coal and Wingdale are mixed in proportion) more, can influence final whiteness, quality and the performance index of product like this.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of reaction evenly, product whiteness is good, the method for produce continuously, the cycle is short, level of automation is high producing light calcium carbonate with calcite.
For achieving the above object, the technical scheme of invention is as follows:
A kind of method of producing light calcium carbonate with calcite, comprise successively select materials, the process of calcining, hydrolysis and carbonization, it is characterized in that: raw material selects for use CaO content greater than 54% calcite; Described calcination process adopts rotary kiln, and adopts the mode of geseous fuel calcining; Described calcination process comprises pre-heating stage, calcination stage and cooling stages successively, carry out in the preheater of described pre-heating stage above rotary kiln, 350 ℃-950 ℃ of preheating temperatures, warm up time 60-120min; Described calcination stage carries out in the kiln body of described rotary kiln, 950 ℃-1150 ℃ of calcining temperatures, calcination time 40-80min; Cooling stages carries out in the water cooler of described rotary kiln rear end.
Optimal way: the rotating speed of described pre-heating stage rotary kiln is 0.5-1.0r/min.
Optimal way: the rotating speed of described calcination stage rotary kiln body is 1.0-2.0r/min.
Optimal way: 850 ℃ of described preheating temperatures, described warm up time 90min.
Optimal way: 1000 ℃-1100 ℃ of described calcining temperatures.
Optimal way: described calcination time 45-70 min.
Optimal way: 1050 ℃ of described calcining temperatures, described calcination time 60min.
Optimal way: PLC automatization control is all adopted in the temperature of rotary kiln in the described calcination process, rotating speed, reinforced and discharging.
The CaO activity of the light calcium carbonate that the present invention produces is good, life is burnt less, no burning, and the whiteness of the light calcium carbonate of production can reach more than 98%, and median size is less than 0.8 μ m, and the every index of product is stable.The main component of the kiln gas that calcination process produces is CO2, by reclaiming, purify kiln gas, the purer CO2 of gained can participate in carbonization process, the CO2 of the kiln gas that employing the inventive method produces is dense, can impel speeding up of carburizing reagent, and then form more tiny calcium carbonate crystal, improved the quality of light calcium carbonate.Compare with traditional shaft kiln, tunnel furnace, produce light calcium carbonate with rotary kiln and shortened the production cycle greatly, level of automation height of the present invention is easy to operate simultaneously, has significantly reduced manually, has reduced production cost, has improved production efficiency.Simultaneously, be raw material with the calcite and adopt rotary kiln to produce light calcium carbonate and filled up domestic blank.
Embodiment
Describe preferred implementation of the present invention below in detail.
Embodiment 1:
The broken raw material of crossing is screened.Conduct simulation calcining sample through screening 13.2mm-40mm sifts out about 1000kg, as the calcining sample.Calcining back sample is respectively got 2-5kg(＜6.7mm).
Table 1 raw material calcite chemistry composition analysis data
Calcined by rotary kiln test parameter and testing sequence are as follows:
1, igniting, the baking kiln.The baking kiln initial stage should heat up according to heating curve, and the rotary kiln rotating speed is about 0.5r/min, and kiln end temperature is raised to more than 450 ℃, and flame temperature reaches 950 ℃.
2, pre-heating stage, reinforced 4-5 bucket, 350 ℃ of preheating temperatures continue insulation, preheating 120min.
3, calcination stage.Heat up, flame temperature reaches 950 ℃, and the rotary kiln rotating speed fixes on about 1.750r/min, and the beginning pusher pushes the first bar material and picks up counting.Every interval 15min pusher once, the push rod stroke carries out the transition to total travel gradually by half trip.
4, sampling.The about 75min of calcining in the kiln body after the discharging, collects calcining finished product materials 2～3kg, in order to doing experiment on a large scale.
5, cooling is flame-out, discharge, continue rotary kiln to barrel temperature less than 100 ℃, shut down, finish test.
Embodiment 2:
1, igniting, the baking kiln.The baking kiln initial stage should heat up according to heating curve, and the rotary kiln rotating speed is about 0.6r/min, and kiln end temperature is raised to more than 450 ℃, and flame temperature reaches 950 ℃.
2, pre-heating stage, reinforced 4-5 bucket, 500 ℃ of preheating temperatures continue insulation, preheating 110min.
3, calcination stage.Heat up, flame temperature reaches 1000 ℃, and the rotary kiln rotating speed fixes on about 1.584r/min, and the beginning pusher pushes the first bar material and picks up counting.Every interval 15min pusher once, the push rod stroke carries out the transition to total travel gradually by half trip.
4, sampling.The about 70min of calcining in the kiln body after the discharging, collects calcining finished product materials 2～3kg, in order to doing experiment on a large scale.
5, cooling is flame-out, discharge, continue rotary kiln to barrel temperature less than 100 ℃, shut down, finish test.
Embodiment 3
1, igniting, the baking kiln.The baking kiln initial stage should heat up according to heating curve, and the rotary kiln rotating speed is about 0.7r/min, and kiln end temperature is raised to more than 450 ℃, and flame temperature reaches 950 ℃.
2, pre-heating stage, reinforced 4-5 bucket, 700 ℃ of preheating temperatures continue insulation, preheating 100min.
3, calcination stage.Heat up, flame temperature reaches 1050 ℃, and the rotary kiln rotating speed fixes on about 1.425r/min, and the beginning pusher pushes the first bar material and picks up counting.Every interval 15min pusher once, the push rod stroke carries out the transition to total travel gradually by half trip.
4, sampling.The about 60min of calcining in the kiln body after the discharging, collects calcining finished product materials 2～3kg, in order to doing experiment on a large scale.
5, cooling is flame-out, discharge, continue rotary kiln to barrel temperature less than 100 ℃, shut down, finish test.
Embodiment 4
1, igniting, the baking kiln.The baking kiln initial stage should heat up according to heating curve, and the rotary kiln rotating speed is about 0.8r/min, and kiln end temperature is raised to more than 450 ℃, and flame temperature reaches 950 ℃.
2, pre-heating stage, reinforced 4-5 bucket, 850 ℃ of preheating temperatures continue insulation, preheating 90min.
3, calcination stage.Heat up, flame temperature reaches 1100 ℃, and the rotary kiln rotating speed fixes on about 1.150r/min, and the beginning pusher pushes the first bar material and picks up counting.Every interval 15min pusher once, the push rod stroke carries out the transition to total travel gradually by half trip.
4, sampling.The about 50min of calcining in the kiln body after the discharging, collects calcining finished product materials 2～3kg, in order to doing experiment on a large scale.
5, cooling is flame-out, discharge, continue rotary kiln to barrel temperature less than 100 ℃, shut down, finish test.
Embodiment 5
1, igniting, the baking kiln.The baking kiln initial stage should heat up according to heating curve, and the rotary kiln rotating speed is about 0.9r/min, and kiln end temperature is raised to more than 450 ℃, and flame temperature reaches 950 ℃.
2, pre-heating stage, reinforced 4-5 bucket, 900 ℃ of preheating temperatures continue insulation, preheating 70min.
3, calcination stage.Heat up, flame temperature reaches 1150 ℃, and the rotary kiln rotating speed fixes on about 1.386r/min, and the beginning pusher pushes the first bar material and picks up counting.Every interval 15min pusher once, the push rod stroke carries out the transition to total travel gradually by half trip.
4, sampling.The about 45min of calcining in the kiln body after the discharging, collects calcining finished product materials 2～3kg, in order to doing experiment on a large scale.
5, cooling is flame-out, discharge, continue rotary kiln to barrel temperature less than 100 ℃, shut down, finish test.
Embodiment 6
1, igniting, the baking kiln.The baking kiln initial stage should heat up according to heating curve, and the rotary kiln rotating speed is about 1.0r/min, and kiln end temperature is raised to more than 450 ℃, and flame temperature reaches 950 ℃.
2, pre-heating stage, reinforced 4-5 bucket, 950 ℃ of preheating temperatures continue insulation, preheating 60min.
3, calcination stage.Heat up, flame temperature reaches 1150 ℃, and the rotary kiln rotating speed fixes on about 1.04r/min, and the beginning pusher pushes the first bar material and picks up counting.Every interval 15min pusher once, the push rod stroke carries out the transition to total travel gradually by half trip.
4, sampling.The about 60min of calcining in the kiln body after the discharging, collects calcining finished product materials 2～3kg, in order to doing experiment on a large scale.
5, cooling is flame-out, discharge, continue rotary kiln to barrel temperature less than 100 ℃, shut down, finish test.
The CaO activity of the light calcium carbonate that the present invention produces is good, life is burnt less, no burning, and the whiteness of the light calcium carbonate of production can reach more than 98%, and median size is less than 0.8 μ m, and the every index of product is stable.The main component of the kiln gas that calcination process produces is CO2, by reclaiming, purify kiln gas, the purer CO2 of gained can participate in carbonization process, the CO2 of the kiln gas that employing the inventive method produces is dense, can impel speeding up of carburizing reagent, and then form more tiny calcium carbonate crystal.Compare with traditional shaft kiln, tunnel furnace, produce light calcium carbonate with rotary kiln and shortened the production cycle greatly, level of automation height of the present invention is easy to operate simultaneously, has significantly reduced manually, has reduced production cost, has improved production efficiency.Simultaneously, be raw material with the calcite and adopt rotary kiln to produce light calcium carbonate and filled up domestic blank.
Above-described only is the preferred implementation of invention, should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the invention design, can also make some distortion and improvement, and these all belong to protection scope of the present invention.
Claims (8)
1. method of producing light calcium carbonate with calcite, comprise successively select materials, the process of calcining, hydrolysis and carbonization, it is characterized in that: raw material selects for use CaO content greater than 54% calcite; Described calcination process adopts rotary kiln, and adopts the mode of geseous fuel calcining; Described calcination process comprises pre-heating stage, calcination stage and cooling stages successively, carry out in the preheater of described pre-heating stage above rotary kiln, 350 ℃-950 ℃ of preheating temperatures, warm up time 60-120min; Described calcination stage carries out in the kiln body of described rotary kiln, 950 ℃-1150 ℃ of calcining temperatures, calcination time 40-80min; Cooling stages carries out in the water cooler of described rotary kiln rear end;
Described calcite contains the composition of following content:
2. according to the described method of producing light calcium carbonate with calcite of claim 1, it is characterized in that: the rotating speed of described pre-heating stage rotary kiln is 0.5-1.0r/min.
3. according to the described method of producing light calcium carbonate with calcite of claim 1, it is characterized in that: the rotating speed of described calcination stage rotary kiln body is 1.0-2.0r/min.
4. according to the described method of producing light calcium carbonate with calcite of among the claim 1-3 any one, it is characterized in that: 850 ℃ of described preheating temperatures, described warm up time 90min.
5. according to any one the described method of producing light calcium carbonate with calcite among the claim 1-3, it is characterized in that: 1000 ℃-1100 ℃ of described calcining temperatures.
6. according to any one the described method of producing light calcium carbonate with calcite among the claim 1-3, it is characterized in that: described calcination time 45-70 min.
7. according to the described method of producing light calcium carbonate with calcite of claim 6, it is characterized in that: 1050 ℃ of described calcining temperatures, described calcination time 60min.
8. according to the described method of producing light calcium carbonate with calcite of among the claim 1-3 any one, it is characterized in that: PLC automatization control is all adopted in the temperature of rotary kiln in the described calcination process, rotating speed, reinforced and discharging.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101932659A CN102674427B (en) | 2012-06-13 | 2012-06-13 | Method for producing light calcium carbonate by utilizing calcite |
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| CN2012101932659A CN102674427B (en) | 2012-06-13 | 2012-06-13 | Method for producing light calcium carbonate by utilizing calcite |
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| CN102674427B true CN102674427B (en) | 2013-07-17 |
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