CN110734234A - Production method and application of cement doped with lead-zinc tailing slag - Google Patents
Production method and application of cement doped with lead-zinc tailing slag Download PDFInfo
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- CN110734234A CN110734234A CN201910884843.5A CN201910884843A CN110734234A CN 110734234 A CN110734234 A CN 110734234A CN 201910884843 A CN201910884843 A CN 201910884843A CN 110734234 A CN110734234 A CN 110734234A
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
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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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of cement production, in particular to a production method and application of kinds of cement doped with lead-zinc tailing slag, which comprises the steps of crushing, batching, grinding and homogenizing raw materials to obtain cement raw materials, adding a mixed material, preheating, predecomposition, melting, calcining, cooling, batching and grinding the cement raw materials to obtain finished cement, preheating and predecomposition the cement raw materials, melting the cement raw materials into a molten pool with a high temperature of 1350-1650 ℃ to obtain a molten mass, spraying fuel and combustion-supporting gas through a spray gun immersed in the molten mass to provide energy, carrying out cement melting and firing reaction to obtain high-temperature melting high-resistance sulfate silicate clinker, wherein the firing reaction temperature is 1350-1650 ℃, the reaction time is 2-10 minutes, and the high-temperature melting clinker is continuously cooled and proportioned to obtain the finished cement.
Description
Technical Field
The invention relates to the technical field of cement production, in particular to a production method and application of kinds of cement doped with lead-zinc tailing slag.
Background
The lead-zinc tailings in China are rich in resources, reserves are in the top of the world, but with the improvement of the exploitation amount of the lead-zinc tailings, the pollution to the environment is increasingly aggravated, and the stacking of waste residues not only occupies a large amount of farmlands, but also pollutes the environment, so that the waste residues are comprehensively utilized as composite raw materials to become economic and practical new mineral resources, so that the environmental pollution can be reduced, the ecological environment can be changed, the national soil can be improved, the economic consumption of enterprises on the raw materials can be reduced, and the method is a new direction for energy conservation and environmental protection.
Disclosure of Invention
In order to overcome the problems in the background art, the invention provides a production method and application of kinds of cement doped with lead-zinc tailing slag, and the technical scheme is as follows:
A process for preparing cement doped with Pb-Zn tailings includes such steps as crushing raw materials, proportioning, grinding, homogenizing to obtain raw cement, adding the mixture of Cunku coal gangue and Pb-Zn tailings =2:1, preheating, predecomposition, fusing, calcining, cooling, proportioning and grinding to obtain cement product, preheating, predecomposition, fusing in high-temp molten pool at 1350-1650 deg.C to obtain fused mass, immersing in fuel and combustion-supporting gas to provide energy, and fusing and calcining to obtain silicate clinker of high-temp molten high-anti-sulfate, which is prepared from 9% Pb-Zn ore dregs and raw material, and mixing with raw material at 1350-1650 deg.C for 2-10 min.
According to the scheme of the step , when the lead-zinc tailings are used as a cement admixture, the addition amount is 5%.
Compared with the prior art, the invention has the beneficial effects that: the environmental pollution can be reduced, the ecological environment can be changed, the land can be improved, and the economic consumption of enterprises on raw materials can be reduced; when the lead-zinc tailings are used as cement admixture, the lead-zinc tailings have good compatibility with the additive, so that the use amount of the additive is effectively reduced;
the tailings of the lead-zinc ore can be used as industrial waste residues of lead-zinc production enterprises, can be used as a siliceous correction raw material for raw material blending, and the chemical components of the industrial waste residues are analyzed to find that the chemical components are close to sandstone, the main component is SiO2, the alkali content is about 0.9 percent, and the alkali content of clinker can be effectively reduced when the tailings of the lead-zinc ore are used for the raw material blending.
The lead-zinc tailings are used for cement production instead of shale as a cement admixture, the standard consistency of the cement is reduced by 0.8 percent compared with that of the shale, the clinker proportion is reduced by 1 percent, and the compatibility with an additive is improved. And (5) sending the sample to a cement quality supervision and quality monitoring station of the autonomous region for inspection and inspection, wherein all indexes of the cement meet the national standard.
The method effectively solves the problem of environmental pollution caused by the local lead-zinc tailings while comprehensively utilizing the three-waste resource of the lead-zinc tailings, and improves the local environmental quality.
The main technical points are as follows: when the lead-zinc tailings are used as a cement admixture, the admixture is Kangsu coal gangue: lead zinc tailings =2: 1.
Drawings
FIG. 1: a production process flow chart.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below to facilitate understanding of the skilled person.
The production method of kinds of cement doped with lead-zinc tailing slag comprises the steps of crushing, batching, grinding and homogenizing raw materials to obtain cement raw materials, adding mixed materials, preheating, predecomposition, melting, calcining, cooling, batching and grinding the cement raw materials to obtain finished cement, preheating and predecomposition the cement raw materials, melting the cement raw materials into a molten pool with the high temperature of 1350-1650 ℃ to obtain a molten mass, spraying fuel and combustion-supporting gas to provide energy through a spray gun immersed in the molten mass, performing cement melting and firing reaction to obtain high-temperature melting high-resistance sulfate silicate clinker, wherein the high-temperature melting high-resistance sulfate silicate is generated by 9% of lead-zinc ore waste residues and the raw material batching, the firing reaction temperature is 1350-1650 ℃, the reaction time is 2-10 minutes, and the high-temperature melting clinker is continuously cooled, batched and ground to obtain the finished cement.
In the invention, the raw materials are matched according to the quality requirement, so that the limestone raw material component meets the quality requirement, and the CaO content is more than 48 percent; the limestone entering the factory is required to be subjected to spot inspection and periodic inspection; the clayey raw material is subjected to detection and sampling assay; after the clay raw material enters a factory, performing spot inspection and periodic inspection as required, wherein the content of SiO2 is more than or equal to 53 percent, and the content of Al2O3 is more than or equal to 12 percent; in order to ensure the quality of raw materials, the granularity of the materials to be ground is less than 7 mm, the water content is strictly controlled, and the specific surface area is controlled to be 350 +/-10 m2Kg, the residue of 80 mu m square-hole sieve is not more than 4%, and the P.1 type portland cement and gypsum are prepared by adopting SO3The content of the natural dihydrate gypsum is more than 35 percent, the content of SO3 in the controlled cement is within the range of 2.0 to 3.0 percent, and the raw material grinding operation is strictly controlled according to the quality index issued by a laboratory notice; the milled raw materials directly enter a raw material homogenizing warehouse, and the material level of the raw material warehouse is ensured to be more than 18m, so that the raw materials entering the kiln are ensured to have proper, uniform and stable components. The clinker temperature in grinding is controlled below 100 ℃, the cement temperature out of grinding is controlled below 135 ℃, grinding is stopped or cooling measures are taken when the temperature exceeds the temperature, the cement performance is prevented from being influenced by gypsum dehydration until the cement quality reaches the standard, and the cement is packaged and delivered from a factory.
In the process, raw materials are crushed, mixed, ground and homogenized to prepare cement raw materials, and then mixed materials are added, wherein the mixed materials are Kangsu coal gangue: lead-zinc tailing slag =2:1, and finally the preparation method is continued according to the embodiment 1, and the application of the lead-zinc tailing slag in cement production is illustrated through a small grinding experiment in four aspects of standard consistency, technical index, cement strength and chemical index;
standard consistency:
the following table is a specification of standard consistency of P.O42.5 cement in 2017 and 3-5 months and small mill experimental data:
| month of the year | 2017 | Mill experiment |
| 3 | 27.7% | 27.1% |
| 4 | 27.8% | 27.0% |
| 5 | 27.8% | 26.5% |
It appears from the table that it is feasible to reduce the water consumption of lead-zinc tailings for standard consistencies.
Technical index or economic index: the raw material cost of the shale is 82% 157.36+7.5% 41.3+5% 47.2+5.5% 47.3=137.09 yuan; the cost of the raw materials of the lead-zinc slag as the mixed material P.O42.5 is as follows: 81% 157.36+8.5% 41.3+5% 50.4+5.5% 47.3=136.09 members; after the lead-zinc ore tailings are used as a mixed material, the ratio of clinker is reduced by 1%, and the P.O42.5 cement is mixed with the lead-zinc ore tailings to carry out a large grinding test, so that 51365 tons of P.O42.5 cement are co-produced. The benefits are as follows: 27320 × 1.16+51365 × 1 = 83056.2-membered;
the strength and chemical indexes of the cement are as follows:
lead-zinc tailing slag, the main component of which is SiO2, the raw material ingredients of the sulfur-resistant clinker are limestone, shale, iron ore dressing waste slag and lead-zinc tailing slag ingredients, the lead-zinc tailing slag is used as industrial waste slag of lead-zinc production enterprises, a plurality of cement enterprises are used as clay raw materials for raw material ingredients, the raw material ingredients are less used as cement admixture, and the chemical ingredients of the raw materials used for production are detailed below;
chemical composition table of raw material
| Name (R) | Loss | SiO2 | AI2O3 | Fe2O3 | CaO | MgO | SO3 | K2O | Na2O | ∑ |
| Limestone | 43.16 | 1.39 | 0.73 | 0.20 | 52.61 | 0.91 | 0.10 | 0.28 | 0.12 | 99.50 |
| Shale | 7.76 | 61.02 | 16.40 | 5.24 | 4.12 | 1.83 | 0.35 | 1.96 | 0.98 | 99.66 |
| Lead-zinc tailings slag | 2.39 | 89.21 | 3.27 | 1.14 | 1.15 | 0.82 | 0.10 | 0.72 | 0.46 | 99.26 |
| Iron slag | 9.85 | 39.80 | 10.25 | 31.43 | 3.65 | 1.98 | 0.10 | 1.73 | 0.62 | 99.41 |
| Coal ash | 53.18 | 21.06 | 8.25 | 8.78 | 1.93 | 3.66 | 1.65 | 1.00 | 99.51 |
The lead-zinc ore waste residue is used as a mixed material through laboratory tests, the cement strength and the chemical index indexes all accord with the national standard, the cement strength and the chemical index indexes have good effects through -period tests, and all results accord with the national standard in a cement inspection report sent by a cement quality supervision and quality control station of the autonomous region.
The national quality inspection center inspects the physical property table of the factory-leaving high-sulfur-resistance cement:
| name (R) | Specific surface area | C3S | C3A | Standard consistency% | Initial setting | Final setting | 3d bending resistance |
| Factory high sulfur-resistant cement | 434 | 45.6 | 1.5 | 26.4 | 177 | 246 | 6.1 |
| 3d resistance to compression | 28d bending resistance | 28d resistance to compression | 14 antenna expansion ratio | ||||
| Factory high sulfur-resistant cement | 31.2 | 8.7 | 55.4 | 0.028 |
Through tests, the high-silicon lead-zinc tailings are successfully used as a cement admixture instead of shale for cement production, and are sent to a cement quality supervision quality monitoring station for inspection and comparison, all indexes of cement meet the national standard, the product quality is stable, the water consumption of the standard consistency of the cement is reduced to degree compared with that of the shale, and the cement has good compatibility with additives.
In the actual production, 9 percent of lead-zinc ore waste residue is used as raw material ingredients to produce the high-sulfate-resistance silicate clinker, and because the lead-zinc ore tailings contain trace elements such as lead, zinc and the like, the easy burning property of the raw material is improved, and the production is successful. The production of the raw material platform is basically equal to the production of the common raw material, the power consumption is reduced by about 0.5kwh/t compared with the sandstone burdening, the 28-day compressive strength of the high-sulfur-resistant clinker is improved by 4MPa compared with the sandstone burdening, and all indexes of the high-sulfate-resistant silicate clinker accord with the national standard of GB-748 2005 sulfate-resistant silicate cement.
The lead-zinc mine tailings are used as a mixed material, the cement strength and chemical indexes meet the national standard, and the standard consistency of the cement is reduced by 0.9 percent compared with that of shale ingredients. Under the condition that the clinker ratio is kept unchanged, along with the increase of the lead-zinc ore tailing ratio and the decrease of the slag ratio, the standard consistency of the cement is in a descending trend, the compression strength of the cement does not change greatly in 28 days, but the compression strength is increased by 1.5MPa in 28 days relative to the shale blending.
Claims (4)
- The production method of kinds of cement doped with lead-zinc tailing slag comprises the steps of crushing, batching, grinding and homogenizing raw materials to obtain cement raw materials, and is characterized in that a mixed material is added, the mixed material is consu coal gangue, the lead-zinc tailing slag =2:1, the cement raw materials are preheated, pre-decomposed, melted, calcined, cooled, batched and ground to obtain finished cement, the cement raw materials are preheated, pre-decomposed and then enter a high-temperature molten pool at 1350 ℃ -1650 ℃ to be melted into a molten mass, fuel and combustion-supporting gas are sprayed through a spray gun immersed in the molten mass to provide energy, the cement is melted and burnt to obtain high-temperature melting high-resistance sulfate silicate clinker, the high-resistance sulfate silicate clinker is generated by 9% of lead-zinc ore waste slag and batching, the burning reaction temperature is 1350 ℃ -1650 ℃, the reaction time is 2-10 minutes, and the high-temperature melting clinker is continuously cooled, batched and ground to obtain the finished cement.
- 2. The method for producing kinds of cement blended with lead-zinc tailings as claimed in claim 1, wherein the lead-zinc tailings is blended in an amount of 5% when used as a cement admixture.
- 3. Use of kinds of tailing slag of any one of claims 1 to 2 for producing cement by adding lead-zinc tailings.
- 4. Use of the admixture of lead-zinc tailings as claimed in claim 3 in the production of 42.5 cement.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111792856A (en) * | 2020-07-17 | 2020-10-20 | 广西大学 | Method for preparing cement clinker by utilizing Guangxi lead-zinc tailing slag and application thereof |
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| CN104355558A (en) * | 2014-10-28 | 2015-02-18 | 中南大学 | Cement employing lead-zinc tailings as raw material and preparation method of cement |
| CN108516709A (en) * | 2018-04-09 | 2018-09-11 | 河南理工大学 | It is a kind of using Pb-Zn tailings as sulphoaluminate cement clinker of raw material and preparation method thereof |
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- 2019-09-19 CN CN201910884843.5A patent/CN110734234A/en active Pending
Patent Citations (3)
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| CN101811838A (en) * | 2010-04-16 | 2010-08-25 | 四川川恒化工股份有限公司 | Cement production method |
| CN104355558A (en) * | 2014-10-28 | 2015-02-18 | 中南大学 | Cement employing lead-zinc tailings as raw material and preparation method of cement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111792856A (en) * | 2020-07-17 | 2020-10-20 | 广西大学 | Method for preparing cement clinker by utilizing Guangxi lead-zinc tailing slag and application thereof |
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