CN112573842B - Method for preparing ingredients for cement production by using limestone mine tailing dolomite - Google Patents
Method for preparing ingredients for cement production by using limestone mine tailing dolomite Download PDFInfo
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- CN112573842B CN112573842B CN202011607423.1A CN202011607423A CN112573842B CN 112573842 B CN112573842 B CN 112573842B CN 202011607423 A CN202011607423 A CN 202011607423A CN 112573842 B CN112573842 B CN 112573842B
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- 239000004568 cement Substances 0.000 title claims abstract description 38
- 239000010459 dolomite Substances 0.000 title claims abstract description 37
- 229910000514 dolomite Inorganic materials 0.000 title claims abstract description 37
- 235000019738 Limestone Nutrition 0.000 title claims abstract description 25
- 239000006028 limestone Substances 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000004615 ingredient Substances 0.000 title claims abstract description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 37
- 239000011707 mineral Substances 0.000 claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 238000005065 mining Methods 0.000 claims abstract description 16
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 55
- 238000002156 mixing Methods 0.000 claims description 11
- 239000002994 raw material Substances 0.000 abstract description 9
- 238000012797 qualification Methods 0.000 abstract description 7
- 238000000638 solvent extraction Methods 0.000 abstract 1
- 235000010755 mineral Nutrition 0.000 description 25
- 239000002699 waste material Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/26—Methods of surface mining; Layouts therefor
- E21C41/30—Methods of surface mining; Layouts therefor for ores, e.g. mining placers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention provides a method for preparing ingredients for cement production by limestone mine tailing dolomite, which comprises the following steps: before mining, drilling and sampling are carried out, the content of MgO in mineral aggregate is detected, sampling points with the MgO content difference exceeding 0.5% are divided into different areas, and mining is carried out in a partitioning manner; crushing ores in each area by using a hammer crusher respectively; and (2) adopting circular piles to be piled in a homogenizing stock bin, determining the size and the height of the circular piles according to the treatment capacity of cement production for one day, and calculating the proportion of mineral aggregate of each area mined in a subarea in the circular piles according to the detection result, so that the MgO content in the circular piles after piling is not more than 2.7%. The invention ensures the component uniformity of each batch of raw materials in the cement production process, avoids the influence of the loading speed on the batching uniformity, improves the qualification rate of the cement raw materials from 65 percent to more than 88 percent, and improves the qualification rate of the cement; the invention also improves the utilization rate of dolomite, reduces the mining cost of mines and protects the environment.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of dolomite; in particular to a method for preparing ingredients for cement by using limestone mine tailing dolomite.
Background
Limestone ore is a sedimentary rock with a mineral content mainly of CaCO3, which is commonly used as a building material and is also an important raw material for many industries. In the exploitation of limestone, a large amount of dolomite is often associated, resulting in minerals containing a large amount of impurities. Dolomite is an ore similar to limestone, but its composition differs greatly. The dolomite contains a large amount of unstable MgO, and the MgO content in the dolomite in most mining areas is between 3 and 27 percent. The collected limestone is used for producing cement, and when the MgO content in the raw material exceeds 3%, the cement quality is easily unqualified, and the burnt MgO is also a refractory material, and the kiln setting of the cement kiln or the damage to the kiln bricks can be caused. Thus, dolomite cannot be used directly in the production of cement.
In the existing cement production batching, in order to improve the utilization rate of collected ores, dolomite is doped into limestone according to a certain proportion, and the content of MgO after doping is controlled within 2 percent so as to reduce the amount of waste materials. However, in actual operation, the automobile is adopted for batching, mineral aggregate is conveyed into a homogenizing bunker for stockpiling according to a calculated proportion, the MgO detection proportion of a part of stockpiling areas reaches 6-8% due to reasons such as different loading and unloading speeds in the transfer process, the qualified rate of cement is greatly reduced, and the qualified rate is only about 65% during sampling detection of a raw material warehouse. Moreover, the dolomite is doped according to the original method, the utilization rate of the dolomite is still low, the material abandoning rate cannot be reduced to below 10 percent, and a large amount of collected dolomite is abandoned, so that not only is the waste of mining manpower and material resources caused, but also the waste of resources and the environmental pollution are caused.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for preparing ingredients for cement by using limestone mine tailing dolomite.
The invention is realized by the following technical scheme.
The invention provides a method for preparing ingredients for cement production by using limestone mine tailing dolomite, which comprises the following steps:
firstly, drilling and sampling before mining, detecting the content of MgO in mineral aggregate, dividing sampling points with the MgO content difference exceeding 0.5% into different areas, and mining in a subarea manner;
step two, coarse crushing, namely crushing the ores in each area by using a hammer crusher respectively;
and step three, homogenizing and stacking, namely adopting circular stacks for stacking in a homogenizing stock bin, determining the size and the height of the circular stacks according to the treatment capacity of cement production for one day, and calculating the proportion of the mineral aggregate of each area mined in the circular stacks according to the detection result, so that the MgO content in the circular stacks after stacking is not more than 2.7%.
And step two, during coarse crushing, storing the same mined mineral aggregate in the same coarse crushed aggregate pile, detecting the MgO content of the coarse crushed aggregate pile again, and calculating the proportion of the mineral aggregate of each area mined in the subarea in the circular pile according to the result of the detection again.
And the secondary detection specifically comprises the steps of randomly and uniformly extracting 8-16 even number of detection points in each direction of the coarse crushed material pile for sampling, respectively detecting the MgO content of each sample, and taking the average value as the MgO content of the coarse crushed material pile.
And step three, when homogenizing and piling, firstly piling up dolomite at the lower part of the round pile, piling up limestone at the upper part of the round pile, and calculating the height of the dolomite according to the MgO content detection result of each mineral aggregate source.
Also comprises the following steps: and step four, performing intermediate crushing and mixing on the round piles of mineral aggregates, taking materials in a horizontal pushing mode, sequentially feeding the mineral aggregates in the round piles into an intermediate crushing crusher, and sequentially stacking the crushed mineral aggregates into an intermediate crushing pile.
Also comprises the following steps: and step five, component adjustment, namely, firstly adopting a first adjusting material pile without MgO, adopting a mineral material pile in the area with the highest MgO content detection result in the step one, then adopting a second adjusting material pile, crushing and mixing in the step four, detecting the MgO content of the middle crushed pile for the third time, taking materials from the first adjusting material pile or the second adjusting material pile, performing equivalent replacement on part of the mineral material in the middle crushed pile by using the taken materials, and adjusting the MgO content in the middle crushed pile to 2.5% -2.8%.
And the third detection specifically comprises the steps of randomly and uniformly extracting 8-16 even number of detection points in each direction of the crushed pile for sampling, respectively detecting the MgO content of each sample, and taking the average value as the MgO content of the crushed pile.
And replacing part of ore materials in the middle crushed piles by using the material taking in an equivalent manner, taking the ore materials out of the plurality of middle crushed piles as a combined pile, mixing the re-taken materials in the first adjusting pile or the second adjusting pile into the combined pile to form a new pile, wherein the size of the new pile is the same as that of the middle crushed piles, and calculating the re-sampling amount according to the third detection result to adjust the MgO content in the new pile to 2.5-2.8%.
The invention has the beneficial effects that:
according to the invention, the MgO content is detected in a subarea manner, subarea mining is carried out, unified calculation and quantitative batching are carried out according to the daily production quantity of cement, and the materials are piled in a round pile subarea manner, so that the component uniformity of each batch of raw materials in the cement production process is ensured, the influence of loading speed on the batching uniformity is avoided, the qualification rate of the cement raw materials is improved from 65% to more than 88%, and the qualification rate of the cement is improved; in addition, the invention improves the upper limit of the MgO content of the ingredients to 2.7 percent, greatly improves the utilization rate of dolomite, ensures that the acquisition and utilization rate of limestone mine reaches 97 percent, not only reduces the mining cost by 6.32 percent, but also avoids the abandonment of dolomite and protects the environment.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
The invention provides a method for preparing ingredients for cement production by limestone mine tailing dolomite, which comprises the following steps:
firstly, drilling and sampling before mining, detecting the content of MgO in mineral aggregate, dividing sampling points with the MgO content difference exceeding 0.5% into different areas, and mining in a subarea manner;
step two, coarse crushing, namely crushing the ores in each area by using a hammer crusher respectively;
and step three, homogenizing and stacking, namely adopting circular stacks for stacking in a homogenizing stock bin, determining the size and the height of the circular stacks according to the treatment capacity of cement production for one day, and calculating the proportion of the mineral aggregate of each area mined in the circular stacks according to the detection result, so that the MgO content in the circular stacks after stacking is not more than 2.7%.
According to the invention, the MgO content is detected in a subarea manner, subarea mining is carried out, unified calculation and quantitative batching are carried out according to the daily production quantity of cement, and the materials are piled in a round pile subarea manner, so that the component uniformity of each batch of raw materials in the cement production process is ensured, the influence of loading speed on the batching uniformity is avoided, the qualification rate of the cement raw materials is improved from 65% to more than 88%, and the qualification rate of the cement is improved; in addition, the invention improves the upper limit of the MgO content of the ingredients to 2.7 percent, greatly improves the utilization rate of dolomite, ensures that the acquisition and utilization rate of limestone mine reaches 97 percent, not only reduces the mining cost by 6.32 percent, but also avoids the abandonment of dolomite and protects the environment.
And step two, during coarse crushing, storing the same mined mineral aggregate in the same coarse crushed aggregate pile, detecting the MgO content of the coarse crushed aggregate pile again, and calculating the proportion of the mineral aggregate of each area mined in the subarea in the circular pile according to the result of the detection again. The mineral aggregate in the same mining area is homogenized through coarse crushing, the error of drilling detection is exposed, and the calculation accuracy of homogenization stockpiling is improved.
And the secondary detection specifically comprises the steps of randomly and uniformly extracting 8-16 even number of detection points in each direction of the coarse crushed material pile for sampling, respectively detecting the MgO content of each sample, and taking the average value as the MgO content of the coarse crushed material pile. The detection error is reduced, and the calculation accuracy of homogenization stockpiling is improved.
And step three, when homogenizing and piling, firstly piling up dolomite at the lower part of the round pile, piling up limestone at the upper part of the round pile, and calculating the height of the dolomite according to the MgO content detection result of each mineral aggregate source. The stacking error rate is reduced, materials are taken in a horizontal pushing mode during material taking, the uniformity of the components of each batch of materials is guaranteed, and the uniformity of the cement quality is improved.
Also comprises the following steps: and step four, performing intermediate crushing and mixing on the round piles of mineral aggregates, taking materials in a horizontal pushing mode, sequentially feeding the mineral aggregates in the round piles into an intermediate crushing crusher, and sequentially stacking the crushed mineral aggregates into an intermediate crushing pile. The horizontal pushing type material taking is adopted, limestone on the upper portion of the round pile and dolomite on the lower portion of the round pile are fully mixed in the crushing process, the mixing uniformity is improved, and the uniformity of cement quality is improved.
Also comprises the following steps: and step five, component adjustment, namely, firstly adopting a first adjusting material pile without MgO, adopting a mineral material pile in the area with the highest MgO content detection result in the step one, then adopting a second adjusting material pile, crushing and mixing in the step four, detecting the MgO content of the middle crushed pile for the third time, taking materials from the first adjusting material pile or the second adjusting material pile, performing equivalent replacement on part of the mineral material in the middle crushed pile by using the taken materials, and adjusting the MgO content in the middle crushed pile to 2.5% -2.8%. And step four, uniformly mixing the material pile, detecting for the third time, exposing the measurement error of the MgO content in the mineral aggregate collecting process, and finally, further accurately controlling the MgO content in the material pile by component adjustment, thereby not only improving the qualification rate of cement, but also ensuring the utilization rate of dolomite and saving resources.
And the third detection specifically comprises the steps of randomly and uniformly extracting 8-16 even number of detection points in each direction of the crushed pile for sampling, respectively detecting the MgO content of each sample, and taking the average value as the MgO content of the crushed pile. The detection error is reduced, and the accuracy of component adjustment is improved.
And replacing part of ore materials in the middle crushed piles by using the material taking in an equivalent manner, taking the ore materials out of the plurality of middle crushed piles as a combined pile, mixing the re-taken materials in the first adjusting pile or the second adjusting pile into the combined pile to form a new pile, wherein the size of the new pile is the same as that of the middle crushed piles, and calculating the re-sampling amount according to the third detection result to adjust the MgO content in the new pile to 2.5-2.8%. The continuity of the operation steps of adjusting the medium-sized and crushed mixed components is ensured, the field is saved, and the working efficiency is improved.
Claims (7)
1. A method for preparing ingredients for cement production by limestone mine tailing dolomite is characterized in that: the method comprises the following steps:
firstly, drilling and sampling before mining, detecting the content of MgO in mineral aggregate, dividing sampling points with the MgO content difference exceeding 0.5% into different areas, and mining in a subarea manner;
step two, coarse crushing, namely crushing the ores in each area by using a hammer crusher respectively;
during coarse crushing, storing the same mined mineral aggregate in the same coarse crushed aggregate pile, detecting the MgO content of the coarse crushed aggregate pile again, and calculating the proportion of the mineral aggregate of each area mined in the subareas in the circular pile according to the result of the detection again;
and step three, homogenizing and stacking, namely adopting circular stacks for stacking in a homogenizing stock bin, determining the size and the height of the circular stacks according to the treatment capacity of cement production for one day, and calculating the proportion of the mineral aggregate of each area mined in the circular stacks according to the detection result, so that the MgO content in the circular stacks after stacking is not more than 2.7%.
2. A method of using limestone mine tailing dolomite as a cement production batching according to claim 1, wherein: and the secondary detection specifically comprises the steps of randomly and uniformly extracting 8-16 even number of detection points in each direction of the coarse crushed material pile for sampling, respectively detecting the MgO content of each sample, and taking the average value as the MgO content of the coarse crushed material pile.
3. A method of using limestone mine tailing dolomite as a cement production batching according to claim 1, wherein: and step three, when homogenizing and piling, firstly piling up dolomite at the lower part of the round pile, piling up limestone at the upper part of the round pile, and calculating the height of the dolomite according to the MgO content detection result of each mineral aggregate source.
4. A method of using limestone mine tailing dolomite as a cement production batching according to claim 1, wherein: also comprises the following steps: and step four, performing intermediate crushing and mixing on the round piles of mineral aggregates, taking materials in a horizontal pushing mode, sequentially feeding the mineral aggregates in the round piles into an intermediate crushing crusher, and sequentially stacking the crushed mineral aggregates into an intermediate crushing pile.
5. A method of using limestone mine tailing dolomite for cement production batching as claimed in claim 4, wherein: also comprises the following steps: and step five, component adjustment, namely, firstly adopting a first adjusting material pile without MgO, adopting a mineral material pile in the area with the highest MgO content detection result in the step one, then adopting a second adjusting material pile, crushing and mixing in the step four, detecting the MgO content of the middle crushed pile for the third time, taking materials from the first adjusting material pile or the second adjusting material pile, performing equivalent replacement on part of the mineral material in the middle crushed pile by using the taken materials, and adjusting the MgO content in the middle crushed pile to 2.5% -2.8%.
6. A method of using limestone mine tailing dolomite in cement production batching as claimed in claim 5, wherein: and the third detection specifically comprises the steps of randomly and uniformly extracting 8-16 even number of detection points in each direction of the crushed pile for sampling, respectively detecting the MgO content of each sample, and taking the average value as the MgO content of the crushed pile.
7. A method of using limestone mine tailing dolomite in cement production batching as claimed in claim 5, wherein: and replacing part of ore materials in the middle crushed piles by using the material taking in an equivalent manner, taking the ore materials out of the plurality of middle crushed piles as a combined pile, mixing the re-taken materials in the first adjusting pile or the second adjusting pile into the combined pile to form a new pile, wherein the size of the new pile is the same as that of the middle crushed piles, and calculating the re-sampling amount according to the third detection result to adjust the MgO content in the new pile to 2.5-2.8%.
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