CN111362597A - Marble waste residue treatment process - Google Patents
Marble waste residue treatment process Download PDFInfo
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- CN111362597A CN111362597A CN202010204386.3A CN202010204386A CN111362597A CN 111362597 A CN111362597 A CN 111362597A CN 202010204386 A CN202010204386 A CN 202010204386A CN 111362597 A CN111362597 A CN 111362597A
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- kiln
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- 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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/104—Ingredients added before or during the burning process
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- 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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
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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
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
- Y02P40/45—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills using fuels from renewable energy sources
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- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a marble waste residue treatment process, and belongs to the field of calcium oxide materials. The marble waste residue treatment process comprises the following steps: drying the marble waste residues, removing water, uniformly mixing with an accelerant, putting into a combining tool, neatly putting the combining tool on a kiln car and pushing into a tunnel kiln, and simultaneously burning fuel to raise the temperature in the kiln to preheat the marble waste residues; the kiln car enters from the kiln head, the kiln car stays for 10-15 hours in the high-temperature area, the kiln car is pushed out of the kiln tail in sequence, the obtained finished product is taken out after cooling, the empty kiln car is loaded again, and the production is repeatedly circulated; and (4) treating waste gas in the kiln and then discharging. The treatment process can change waste materials of stone processing plants into valuable materials, and achieves the aim of 'economic circulation'.
Description
Technical Field
The invention relates to the field of calcium oxide materials, in particular to a marble waste residue treatment process.
Background
In the process of processing marble, a large amount of solid waste, namely waste slag, is generated in the processes of saw blade, cutting and grinding. With the continuous development and growth of marble industry, the produced waste is piled up like a mountain, which not only occupies a large amount of land, but also seriously influences the life of people due to dust pollution and water source pollution. And simultaneously restricts the economic sustainable development of the area. Pollution treatment, environment optimization and resource conservation are important measures for economic sustainable development and economic growth mode conversion in marble material processing centralized areas. In the process of processing natural stone, about 5% of raw material and about 1/3% of leftover material of rough board are generated. If the waste is discarded, the waste is transported out at an economic cost, and the waste is not environment-friendly due to improper stacking.
The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
The invention aims to provide a marble waste residue treatment process, which aims to solve the technical problems that marble waste residues affect the environment and the yield and the quality of calcium oxide are improved.
For this purpose, the invention proposes the following solutions:
a marble waste residue treatment process comprises the following steps:
s1: after the marble waste residue is dried and the water is removed, the dried marble waste residue and the accelerant are uniformly mixed and then are put into a combining tool, the combining tool is orderly put on a kiln car and pushed into a tunnel kiln, simultaneously, fuel is combusted to raise the temperature in the kiln, and the marble waste residue is preheated for 2-5 hours at the temperature of 300-600 ℃;
s2: the kiln car enters from the kiln head, the temperature in the high-temperature area reaches 1100-1300 ℃, the oxygen content in the tunnel kiln is adjusted to 6-8%, the kiln car stays for 10-15h, then the kiln car is pushed out of the kiln tail in sequence, and the obtained finished product is taken out and cooled; the waste gas in the kiln is treated and then is recycled or discharged;
preferably, the fuel is one or both of biomass particles and natural gas, the methane content of the natural gas being > 90%.
Preferably, the kiln car is pushed by using a hydraulic propeller to move the kiln car at a speed of 7-10m/h in the tunnel kiln.
Preferably, the waste gas treatment is that the waste gas is treated by a water mist spraying dust removal device.
Preferably, the accelerator comprises the following components in parts by weight: 15-27 parts of vanadium pentoxide, 7-20 parts of bismuth trioxide and 0.1-1 part of copper oxide.
Preferably, the addition amount of the accelerator is 0.1-0.5% of the mass of the waste residue.
Preferably, the preparation process of the accelerator comprises the following steps:
s1: uniformly mixing vanadium pentoxide and bismuth trioxide, grinding, and sieving with a 300-mesh 350-mesh sieve to obtain a mixture 1;
s2: adding the mixture 1 and copper oxide into a stirrer, stirring at the speed of 1100-1300rpm for 20-40min, and drying at the temperature of 27-35 ℃ until the water content is less than 10% to obtain the promoter.
Preferably, the waste residue drying step is as follows: and (3) conveying the waste residues into a dryer, drying at the temperature of 100-400 ℃ for 10-20min, and rotationally drying the waste residues in a drying roller with the diameter of 1.5m at 3-6rpm in the drying process until the water content of the waste residues is less than 10%.
Preferably, the drying is performed at a temperature of 320 ℃.
Preferably, in the waste residue drying step, waste gas treated in the kiln is sent to a dryer through an exhaust fan, so that the temperature is raised to achieve secondary utilization of the waste gas.
Compared with the prior art, the invention has the advantages that:
1. in the product of the embodiment of the invention, the content of calcium oxide reaches more than 92.24 percent and reaches a better level. The data show that the addition of vanadium pentoxide, bismuth trioxide, copper oxide increases the calcium oxide content and has a beneficial effect on the removal of silicon dioxide and magnesium oxide. After the accelerator is added and the marble waste residue is treated by the method, the content of the calcium oxide in the obtained finished product is higher, and the impurities are reduced.
2. By combining the data in table 1, it can be seen that in the accelerator, vanadium pentoxide, bismuth trioxide and copper oxide have a synergistic effect in the decomposition process of calcium carbonate, so that the content of calcium oxide, which is obtained after the treatment of the marble waste residue, is increased.
3. In practical application, the treatment process production line can produce 4.5 ten thousand tons of calcium oxide per year, can recycle 8.75 ten thousand tons of marble and granite waste residues per year, and effectively treat the waste residues generated by a stone processing factory; meanwhile, the biomass particle and natural gas are used as fuels, and the processing method is cleaner than the processing method of the traditional process which uses coal and the like as fuels.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIGS. 2 and 3 are views of the tunnel kiln of the present invention;
FIG. 4 is a side view of the tunnel kiln of the present invention;
FIGS. 5 and 6 are diagrams of the kiln car of the invention;
fig. 7 is a diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein like reference numerals refer to like parts, unless otherwise specified.
Example 1
A marble slag treatment process, as shown in fig. 1, comprising the following steps:
s1: after the marble waste residue is dried to remove water, uniformly mixing the dried marble waste residue with an accelerant with the mass of 0.1% of the waste residue, putting the mixture into a combining tool (figure 7), orderly putting the combining tool on a kiln car and pushing the kiln car into a tunnel kiln (figure 2), simultaneously burning fuel to raise the temperature in the kiln, and preheating the marble waste residue for 2 hours at 300 ℃;
s2: the kiln car (figures 5 and 6) enters from the kiln head (figure 3), the temperature in the high-temperature area reaches 1100 ℃, the oxygen content in the tunnel kiln is adjusted to 6 percent, after the kiln car stays for 10 hours, the kiln car is pushed out of the kiln tail in sequence, and the obtained finished product is taken out and cooled; the waste gas in the kiln is treated and then is recycled or discharged;
the fuel is biomass particles.
The kiln car is pushed by a hydraulic propeller, so that the kiln car moves at the speed of 7m/h in the tunnel kiln.
The waste gas treatment is that the waste gas is treated by a water mist spraying dust removal device.
The waste residue drying step is as follows: and (3) conveying the waste residues into a dryer, drying at the temperature of 100 ℃ for 10min, and rotationally drying the waste residues in a drying roller with the diameter of 1.5m at 3rpm in the drying process until the water content of the waste residues is less than 10%.
And a step of drying the waste residues, namely conveying the waste gas treated in the kiln to a dryer through an exhaust fan to enable the temperature to rise so as to achieve secondary utilization of the waste gas.
The accelerant comprises the following components in parts by weight: 15 parts of vanadium pentoxide, 7 parts of bismuth trioxide and 0.1 part of copper oxide.
The preparation process of the accelerant comprises the following steps:
s1: mixing vanadium pentoxide and bismuth trioxide uniformly, grinding, and sieving by a 300-mesh sieve to obtain a mixture 1;
s2: adding the mixture 1 and copper oxide into a stirrer, stirring at 1100rpm for 20min, and oven drying at 27 deg.C until the water content is less than 10% to obtain the promoter.
Example 2
A marble slag treatment process, as shown in fig. 1, comprising the following steps:
s1: after the marble waste residue is dried to remove water, uniformly mixing the dried marble waste residue with an accelerant with the mass of 0.5% of the waste residue, putting the mixture into a combining tool (figure 7), orderly putting the combining tool on a kiln car and pushing the kiln car into a tunnel kiln (figure 2), simultaneously burning fuel to raise the temperature in the kiln, and preheating the marble waste residue for 5 hours at the temperature of 600 ℃;
s2: the kiln car (figures 5 and 6) enters from the kiln head (figure 3), the temperature reaches 1300 ℃ in the high-temperature area, the oxygen content in the tunnel kiln is adjusted to 8 percent, the kiln car stays for 15 hours, the kiln car is pushed out of the kiln tail in sequence, and the obtained finished product is taken out and cooled; the waste gas in the kiln is treated and then is recycled or discharged;
the fuel is natural gas, and the content of methane in the natural gas is 92%.
The kiln car is pushed by a hydraulic thruster, so that the kiln car moves at the speed of 10m/h in the tunnel kiln.
The waste gas treatment is that the waste gas is treated by a water mist spraying dust removal device.
The waste residue drying step is as follows: and (3) conveying the waste residues into a dryer, drying at the temperature of 400 ℃ for 20min, and rotationally drying the waste residues in a drying roller with the diameter of 1.5m at 6rpm in the drying process until the water content of the waste residues is less than 10%.
And a step of drying the waste residues, namely conveying the waste gas treated in the kiln to a dryer through an exhaust fan to enable the temperature to rise so as to achieve secondary utilization of the waste gas.
The accelerant comprises the following components in parts by weight: 27 parts of vanadium pentoxide, 20 parts of bismuth trioxide and 1 part of copper oxide.
The preparation process of the accelerant comprises the following steps:
s1: mixing vanadium pentoxide and bismuth trioxide uniformly, grinding, and sieving with 350-mesh sieve to obtain a mixture 1;
s2: adding the mixture 1 and copper oxide into a stirrer, stirring at 1300rpm for 40min, and drying at 35 deg.C until the water content is less than 10% to obtain the promoter.
Example 3
A marble slag treatment process, as shown in fig. 1, comprising the following steps:
s1: after the marble waste residue is dried to remove water, uniformly mixing the dried marble waste residue with an accelerant with the mass of 0.37 percent of the waste residue, putting the mixture into a combining tool (figure 7), orderly putting the combining tool on a kiln car and pushing the kiln car into a tunnel kiln (figure 2), simultaneously burning fuel to raise the temperature in the kiln, and preheating the marble waste residue for 3 hours at 400 ℃;
s2: the kiln car (figures 5 and 6) enters from the kiln head (figure 3), the temperature reaches 1200 ℃ in the high-temperature area, the oxygen content in the tunnel kiln is adjusted to 7 percent, after the kiln car stays for 13 hours, the kiln car is pushed out of the kiln tail in sequence, and the obtained finished product is taken out and cooled; the waste gas in the kiln is treated and then is recycled or discharged;
the fuel is biomass particles.
The kiln car is pushed by a hydraulic propeller, so that the kiln car moves at the speed of 9m/h in the tunnel kiln.
The waste gas treatment is that the waste gas is treated by a water mist spraying dust removal device.
The waste residue drying step is as follows: and (3) conveying the waste residues into a dryer, drying at 320 ℃ for 16min, and rotationally drying the waste residues in a drying roller with the diameter of 1.5m at 5rpm in the drying process until the water content of the waste residues is less than 10%.
And a step of drying the waste residues, namely conveying the waste gas treated in the kiln to a dryer through an exhaust fan to enable the temperature to rise so as to achieve secondary utilization of the waste gas.
The accelerant comprises the following components in parts by weight: 21 parts of vanadium pentoxide, 14 parts of bismuth trioxide and 0.62 part of copper oxide.
The preparation process of the accelerant comprises the following steps:
s1: mixing vanadium pentoxide and bismuth trioxide uniformly, grinding, and sieving with 350-mesh sieve to obtain a mixture 1;
s2: adding the mixture 1 and copper oxide into a stirrer, stirring at 1300rpm for 30min, and drying at 31 deg.C until the water content is less than 10% to obtain the promoter.
Comparative example 1
The process flow was essentially the same as in example 3, except that no vanadium pentoxide was added as a promoter.
Comparative example 2
The process flow was essentially the same as in example 3 except that bismuth trioxide was not added to the promoter.
Comparative example 3
The process flow was essentially the same as in example 3 except that no copper oxide was added to the promoter.
Comparative example 4
The process flow was substantially the same as in example 3 except that no vanadium pentoxide, bismuth trioxide, or copper oxide was added as the promoter.
The finished products obtained from the marble slag processed by the processes of examples 1-3 and comparative examples 1-4 were tested according to GB/T4734-1996, and the obtained data are shown in the following table.
TABLE 1 chemical content of marble slag after treatment
| Group of | CaO(％) | SiO2(％) | MgO(％) |
| Example 1 | 92.24 | 5.76 | 2.44 |
| Example 2 | 93.72 | 5.21 | 2.36 |
| Example 3 | 94.15 | 4.97 | 2.09 |
| Comparative example 1 | 90.81 | 6.19 | 3.13 |
| Comparative example 2 | 88.37 | 6.38 | 3.75 |
| Comparative example 3 | 88.46 | 6.70 | 2.59 |
| Comparative example 4 | 80.62 | 7.49 | 5.83 |
In the product of the embodiment of the invention, the content of calcium oxide reaches more than 92.24 percent and reaches a better level. The data show that the addition of vanadium pentoxide and copper oxide improves the calcium oxide content and has a beneficial effect on the removal of silicon dioxide and magnesium oxide. In the absence of the three components of the accelerator, the calcium oxide content of example 1 is increased by 14.41% compared with comparative example 4, and the silicon dioxide and magnesium oxide contents are respectively reduced by 23.09% and 58.10%. After the accelerator is added and the marble waste residue is treated by the method, the content of the obtained finished product calcium oxide is higher, and the content of silicon dioxide and magnesium oxide which are used as impurities and have larger proportion is also reduced.
After vanadium pentoxide is added into the accelerant, particles can be reduced when the vanadium pentoxide is melted in the heating and temperature rising process, and then the particles are filled into the pore canal gaps of calcium carbonate particles, so that the heat transfer is accelerated, the decomposition of calcium carbonate is promoted, if too much vanadium pentoxide is added, the pore canals are blocked, the diffusion of carbon dioxide is hindered, and the decomposition rate of calcium carbonate is slowed down. The added copper oxide can react with the decomposition product of calcium carbonate to generate CaCu2O3And Ca2CuO3This can reduce the thickness of the product layer locally or wholly, thereby reducing the mass transfer resistance in thermal decomposition and finally promoting the decomposition of calcium carbonate, CaCu2O3And Ca2CuO3After production, vanadic anhydride can also be filledFilling the gaps between the pore passages of the two material particles to accelerate the heat transfer and further accelerate the decomposition of the calcium carbonate. Ca is formed by the reaction of bismuth trioxide and the calcium oxide formed at high temperatures6Bi7O16.5The method can improve the diffusion efficiency of carbon dioxide in a product layer, improve the diffusion rate of the carbon dioxide into copper oxide, strengthen the reaction and promote the decomposition of calcium carbonate. By combining the data in table 1, it can be seen that vanadium pentoxide, bismuth trioxide and copper oxide have a synergistic effect in the decomposition process of calcium carbonate, so that the content of calcium oxide, which is obtained after the treatment of the marble waste residue, is increased.
Those skilled in the art will recognize that numerous variations are possible in light of the above description, and thus the examples are intended to describe one or more specific embodiments.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and such substitutions and modifications are to be considered as within the scope of the invention.
Claims (10)
1. A marble waste residue treatment process is characterized by comprising the following steps:
s1: after the marble waste residue is dried and the water is removed, the dried marble waste residue and the accelerant are uniformly mixed and then are put into a combining tool, the combining tool is orderly put on a kiln car and pushed into a tunnel kiln, simultaneously, fuel is combusted to raise the temperature in the kiln, and the marble waste residue is preheated for 2-5 hours at the temperature of 300-600 ℃;
s2: the kiln car enters from the kiln head, the temperature in the high-temperature area reaches 1100-1300 ℃, the oxygen content in the tunnel kiln is adjusted to 6-8%, the kiln car stays for 10-15h, then the kiln car is pushed out of the kiln tail in sequence, and the obtained finished product is taken out and cooled; and the waste gas in the kiln is treated and then is recycled or discharged.
2. The marble slag treatment process of claim 1, wherein the fuel is one or both of biomass particles and natural gas, the methane content of natural gas being > 90%.
3. The marble slag treatment process of claim 1, wherein the kiln car is moved in the tunnel kiln at a speed of 7-10m/h by being propelled by a hydraulic propeller.
4. The marble slag treatment process of claim 1, wherein the waste gas treatment is a waste gas treatment by a water mist spraying dust removing device.
5. The marble slag treatment process of claim 1, wherein the accelerator comprises the following components in parts by weight: 15-27 parts of vanadium pentoxide, 7-20 parts of bismuth trioxide and 0.1-1 part of copper oxide.
6. A marble slag treatment process according to claim 1 or 5, wherein the amount of accelerator added is 0.1-0.5% of the mass of the slag.
7. The marble slag treatment process of claim 1 or 5, wherein the preparation process of the accelerator comprises the following steps:
s1: uniformly mixing vanadium pentoxide and bismuth trioxide, grinding, and sieving with a 300-mesh 350-mesh sieve to obtain a mixture 1;
s2: adding the mixture 1 and copper oxide into a stirrer, stirring at the speed of 1100-1300rpm for 20-40min, and drying at the temperature of 27-35 ℃ until the water content is less than 10% to obtain the promoter.
8. The marble slag treatment process of claim 1, wherein the slag drying step is: and (3) conveying the waste residues into a dryer, drying at the temperature of 100-400 ℃ for 10-20min, and rotationally drying the waste residues in a drying roller with the diameter of 1.5m at 3-6rpm in the drying process until the water content of the waste residues is less than 10%.
9. The marble slag treatment process of claim 8, wherein said drying is carried out at a temperature of 320 ℃.
10. A marble slag treatment process according to claim 1 or 8, wherein in said slag drying step, exhaust gas treated in the kiln is sent to a dryer by an exhaust fan to raise the temperature to achieve secondary utilization of the exhaust gas.
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| CN116553840A (en) * | 2023-07-07 | 2023-08-08 | 邯郸市西林科技股份有限公司 | Production method of high-activity calcium oxide |
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