阅读说明：本技术 一种利用铅锌渣、萤石矿选矿尾渣为原材的水泥生产方法 (Cement production method using lead-zinc slag and fluorite ore dressing tailings as raw materials ) 是由 余三平 于 2019-09-28 设计创作，主要内容包括：本发明涉及水泥生产技术领域,且公开了一种利用铅锌渣、萤石矿选矿尾渣为原材的水泥生产方法,具体生产步骤为：步骤一：选取原料,选取一定量且大小均等的砂岩,并将砂岩放入在研磨机中进行研磨,将研磨过后的砂岩倒入在筛选机中,将大块的砂岩与粉末状的砂岩分离,从而保留了粉末状的砂岩,留有备用；步骤二：称取一定量的石灰石、黏土、铁矿石碎屑、铅锌渣和萤石矿选矿尾渣。该利用铅锌渣、萤石矿选矿尾渣为原材的水泥生产方法,具备实现水泥熟料低温煅烧,降低熟料热耗；提高熟料强度；改善熟料性能；同时将煤炭中的硫以<Image he="75" wi="127" file="DDA0002219620100000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>矿物形式固定在熟料中减少硫的循环富集,缓解窑尾系统结皮堵塞,减少窑系统的工艺事故等优点。(The invention relates to the technical field of cement production, and discloses a cement production method by using lead-zinc slag and fluorite ore dressing tailings as raw materials, which comprises the following specific production steps: the method comprises the following steps: selecting raw materials, selecting a certain amount of sandstone with equal size, grinding the sandstone in a grinder, pouring the ground sandstone into a screening machine, and separating the massive sandstone from the powdery sandstone, so that the powdery sandstone is reserved for later use; step two: weighing a certain amount of limestone, clay, iron ore fragments, lead-zinc slag and fluorite ore dressing tailings. The cement production method using the lead-zinc slag and the fluorite ore dressing tailings as raw materials has the advantages that the low-temperature calcination of cement clinker is realized, and the heat consumption of the clinker is reduced; the clinker strength is improved; the performance of clinker is improved; simultaneously adding sulfur in coal The mineral form is fixed in clinker aggregate to reduce the cyclic enrichment of sulfur, relieve the skinning and blocking of a kiln tail system, reduce the process accidents of the kiln system and the like.)

1. A cement production method using lead-zinc slag and fluorite ore dressing tailings as raw materials is characterized by comprising the following steps: the main raw materials of the cement comprise sandstone powder, limestone, clay, iron ore fragments, lead-zinc slag and fluorite ore dressing tailings, wherein the weight percentages of the sandstone powder, the limestone, the clay, the iron ore fragments, the lead-zinc slag and the fluorite ore dressing tailings are respectively: 10-15%, 80-85%, 5-10%, 4-6%, 8-14% and 12-16%;

The specific production steps are as follows:

The method comprises the following steps: selecting raw materials, selecting a certain amount of sandstone with equal size, grinding the sandstone in a grinder, pouring the ground sandstone into a screening machine, and separating the massive sandstone from the powdery sandstone, so that the powdery sandstone is reserved for later use;

Step two: weighing a certain amount of limestone, clay, iron ore fragments, lead-zinc slag and fluorite ore dressing tailings, simultaneously pouring the limestone, the clay, the iron ore fragments, the lead-zinc slag and the fluorite ore dressing tailings into a mixing tank for stirring and mixing, and after materials in the mixing tank are uniformly mixed, pouring the powdery sandstone in the step one into the mixing tank for continuously mixing;

Step three: and D, placing the raw powder in the step two into a calcining kiln for calcining, and taking out the cement clinker for cooling after the calcining is completed.

2. The method for producing the cement by using the lead-zinc slag and the fluorite ore dressing tailings as raw materials according to claim 1, which is characterized by comprising the following steps of: the grinding machine and the screening machine are all multi-stage equipment.

3. the method for producing the cement by using the lead-zinc slag and the fluorite ore dressing tailings as raw materials according to claim 1, which is characterized by comprising the following steps of: the lead-zinc slag in the second step is mainly lead-zinc slag selected from a large-scale lead-zinc refinery, and the lead-zinc slag contains higher Fe₂O₃Can be used as cement clinker iron correction material.

4. the method for producing the cement by using the lead-zinc slag and the fluorite ore dressing tailings as raw materials according to claim 1, which is characterized by comprising the following steps of: and D, the fluorite ore beneficiation tailings in the step II are mainly mined from fluorite ores, and the waste residues of the fluorite ore mined tailings subjected to repeated beneficiation are mainly gangue mineral powder, mainly quartz and contain a small amount of calcium fluoride.

5. The method for producing the cement by using the lead-zinc slag and the fluorite ore dressing tailings as raw materials according to claim 1, which is characterized by comprising the following steps of: and the cooling mode in the third step is a rapid cooling mode.

6. The method for producing the cement by using the lead-zinc slag and the fluorite ore dressing tailings as raw materials according to claim 1, which is characterized by comprising the following steps of: the decomposition rate of the limestone is more than 90%.

7. The method for producing the cement by using the lead-zinc slag and the fluorite ore dressing tailings as raw materials according to claim 1, which is characterized by comprising the following steps of: the sandstone is hard sandstone.

Technical Field

The invention relates to the technical field of cement production, in particular to a cement production method by using lead-zinc slag and fluorite ore dressing tailings as raw materials.

Background

The cement is made up by using limestone and clay as main raw materials, through the processes of crushing, proportioning and grinding, and then feeding them into cement kiln, calcining to obtain clinker, and then adding a proper quantity of gypsum, mixing material and additive into the clinker, and grinding so as to obtain the invented product. The cement is widely applied to engineering such as civil construction, water conservancy, national defense and the like.

The patent No. CN107324675A discloses a method for producing cement, which changes the traditional method for preparing cement by using limestone as raw material and lime as raw material, so that the process of decomposing limestone into lime in a rotary kiln is omitted, and the output per machine hour of clinker in the rotary kiln is increased by 2-3 times. The method has the advantages of simple process, low equipment investment, low energy consumption, high yield and good comprehensive economic benefit, and is particularly suitable for cement production of small rotary kilns of medium and small cement enterprises.

The production method of the cement comprises the steps of collecting waste tiles and waste ceramic products for construction, washing, drying, grinding, finely grinding into tile powder and ceramic powder, and manufacturing the cement by using quicklime powder, gypsum powder, tile powder and ceramic powder. The cement is manufactured by using the building waste, so that the cost can be saved, the waste is changed into the valuable, and the environment is protected. The brick and tile and the ceramic can provide sufficient elements such as calcium, silicon and the like for the cement, and the quality of the cement is guaranteed.

However, the main raw materials of the cement in the two patents do not adopt lead-zinc slag and fluorite ore dressing tailing raw materials, so that the quality of the produced cement is greatly reduced to a certain extent. Therefore, the invention provides a cement production method by using lead-zinc slag and fluorite ore dressing tailings as raw materials.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a cement production method by using lead-zinc slag and fluorite ore dressing tailings as raw materials, which has the advantages of realizing low-temperature calcination of cement clinker and reducing the heat consumption of the clinker; improving clinker strength (especially early strength of low alkali clinker); the performance of clinker is improved; simultaneously adding sulfur in coalFixation in mineral form in clinker to reduce cyclic enrichment of sulfurThe method has the advantages of relieving the skinning and blocking of a kiln tail system, reducing the process accidents of the kiln system and the like, and solves the problem that the quality of produced cement is greatly reduced to a certain extent because the lead-zinc slag and fluorite ore dressing tailing raw materials are not adopted in the main raw materials of the existing cement.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a utilize cement production method of lead zinc sediment, fluorite ore dressing tailings as raw materials, this cement's main raw materials include sandstone powder, lime stone, clay, iron ore piece, lead zinc sediment and fluorite ore dressing tailings, the weight percent of sandstone powder, lime stone, clay, iron ore piece, lead zinc sediment and fluorite ore dressing tailings is respectively: 10-15%, 80-85%, 5-10%, 4-6%, 8-14% and 12-16%;

The specific production steps are as follows:

The method comprises the following steps: selecting raw materials, selecting a certain amount of sandstone with equal size, grinding the sandstone in a grinder, pouring the ground sandstone into a screening machine, and separating the massive sandstone from the powdery sandstone, so that the powdery sandstone is reserved for later use;

Step two: weighing a certain amount of limestone, clay, iron ore fragments, lead-zinc slag and fluorite ore dressing tailings, simultaneously pouring the limestone, the clay, the iron ore fragments, the lead-zinc slag and the fluorite ore dressing tailings into a mixing tank for stirring and mixing, and after materials in the mixing tank are uniformly mixed, pouring the powdery sandstone in the step one into the mixing tank for continuously mixing;

step three: and D, placing the raw powder in the step two into a calcining kiln for calcining, and taking out the cement clinker for cooling after the calcining is completed.

Preferably, the grinder and the screening machine are both multi-stage devices.

Preferably, the lead-zinc slag in the second step is mainly lead-zinc slag produced by a large-scale lead-zinc refinery, and the lead-zinc slag contains high Fe₂O₃Can be used as cement clinker iron correction material.

Preferably, the fluorite ore dressing tailings in the second step are mainly mined from fluorite ore mining enterprises, and the waste residues of the tailings obtained after the fluorite ore mining through repeated ore dressing are mainly gangue mineral powder, mainly quartz and contain a small amount of calcium fluoride.

preferably, the cooling mode in the third step is a rapid cooling mode.

Preferably, the decomposition rate of the limestone is 90% or more.

preferably, the sandstone is hard sandstone.

(III) advantageous effects

Compared with the prior art, the invention provides a cement production method by using lead-zinc slag and fluorite ore dressing tailings as raw materials, and the cement production method has the following beneficial effects:

1. The cement production method using the lead-zinc slag and the fluorite ore dressing tailings as raw materials is characterized in that the main raw materials of the cement comprise sandstone powder, limestone, clay, iron ore fragments, the lead-zinc slag and the fluorite ore dressing tailings, and the lead-zinc slag contains higher Fe₂O₃The lead-free cement clinker iron correction material can be used as a cement clinker iron correction material, and meanwhile, the problem of great environmental pollution caused by residual heavy metal lead can be avoided; utilizing CaF in waste residue after repeated ore dressing of fluorite ore₂And SO generated by high-sulfur coal in the process of calcining cement clinker₃The composite mineralizer is formed, so that the low-temperature calcination of cement clinker is realized, and the heat consumption of the clinker is reduced; improving clinker strength (especially early strength of low alkali clinker); the performance of clinker is improved; simultaneously adding sulfur in coalThe mineral form is fixed in clinker to reduce the cyclic enrichment of sulfur, relieve the skinning and blocking of a kiln tail system, reduce the process accidents of the kiln system and realize the use of high-sulfur coal as fuel in the novel dry cement calcination process.

Detailed Description

The invention discloses a cement production method by using lead-zinc slag and fluorite ore dressing tailings as raw materials, and a person skilled in the art can use the contents of the text for reference and appropriately improve process parameters to realize the production. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the production methods of the present invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications of the production methods described herein, as well as appropriate variations and combinations, may be made to implement and use the techniques of the present invention without departing from the spirit and scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The invention is further illustrated by the following examples.

The utility model provides a utilize cement production method of lead zinc sediment, fluorite ore dressing tailings as raw materials, this cement's main raw materials include sandstone powder, lime stone, clay, iron ore piece, lead zinc sediment and fluorite ore dressing tailings, the weight percent of sandstone powder, lime stone, clay, iron ore piece, lead zinc sediment and fluorite ore dressing tailings is respectively: 10-15%, 80-85%, 5-10%, 4-6%, 8-14% and 12-16%.

At high temperatures, CaF₂Chemically reacting with water vapor to form HF, HF and CaCO₃Chemical reaction CaF₂Has the function of catalytic reaction, and CO is generated in a decomposing furnace and a preheater system₂Under the condition of constant partial pressure and constant temperature, CaCO is made₃The decomposition reversible reaction is carried out in the direction beneficial to the decomposition, thereby accelerating the decomposition of carbonate and reducing the temperature required by the decomposition reaction; tests show that CaCO at 100 ℃ can be reduced₃Decomposition temperature, since HF is very easily reacted with SiO₂A chemical reaction is carried out to generate SiF₄Destruction of SiO in quartz₂Si-O bond of (A), destroying crystalline SiO₂Into amorphous SiO₂Is beneficial to the solid-phase reaction of cement clinker, SiF₄Hydrolysis in a humid atmosphere releases HF and silicic acid, the chemical reaction formula is as follows:

2HF+CaCO₃＝CaF₂+H₂O+CO₂

4HF+SiO2＝Si F4+2H2O

CaF is caused in the process of firing the clinker₂、SO₃ZnO and PbO, reduces firing temperature and liquid phase viscosity, and promotes C₃Formation of S, CaF₂In the solid-phase reaction of raw materials, 2C is generated₂S CaF2 and 3C₃S·CaF2，2C₂S CaF2 and 3C₃S CaF2 is intermediate transition phase and can promote C₂S and C₃Formation of S, SO during calcination of cement clinker₃Can form 2C₂S·CaSO₄and 4CaO 3Al₂O₃·SO₃(calcium sulphoaluminate is abbreviated to) Intermediate transition phase of, 2C₂S·CaF2、3C₃S·CaF2、2C₂S·CaSO₄、The formation temperature and decomposition temperature of these intermediate transition phases are low, so that C is₃S begins to form at about 1200 ℃, the forming temperature of a liquid phase is reduced, the liquid phase quantity is increased, the viscosity of the liquid phase is reduced, mass point diffusion in the liquid phase is facilitated, clinker can be sintered at about 1350 ℃, and the sintering temperature of the clinker is reduced by about 150 ℃.Begins to form at about 950 deg.C, reaches the maximum yield at 1200 deg.C, and rapidly decomposes into C when the calcination temperature exceeds 1300 deg.C₃A. CaO and SO₃. But due to CaF₂、SO₃ZnO, PbO, increasing the decomposition temperature to 1360 deg.CAnd alite coexist after the clinker is fired, so that the sulfur in the high-sulfur coal is fixed in the clinker and taken out of a kiln system.

The specific production steps are as follows:

The method comprises the following steps: selecting raw materials, selecting a certain amount of sandstone with equal size, grinding the sandstone in a grinder, pouring the ground sandstone into a screening machine, and separating the massive sandstone from the powdery sandstone, so that the powdery sandstone is reserved for later use;

step two: weighing a certain amount of limestone, clay, iron ore fragments, lead-zinc slag and fluorite ore dressing tailings, simultaneously pouring the limestone, the clay, the iron ore fragments, the lead-zinc slag and the fluorite ore dressing tailings into a mixing tank for stirring and mixing, and after materials in the mixing tank are uniformly mixed, pouring the powdery sandstone in the step one into the mixing tank for continuously mixing;

Step three: and D, placing the raw powder in the step two into a calcining kiln for calcining, and taking out the cement clinker for cooling after the calcining is completed.

The grinding machine and the screening machine are all multi-stage equipment.

the lead-zinc slag in the second step is mainly lead-zinc slag selected from a large-scale lead-zinc refinery, and the lead-zinc slag contains higher Fe₂O₃can be used as cement clinker iron correction material.

And D, the fluorite ore beneficiation tailings in the step II are mainly mined from fluorite ores, and the waste residues of the fluorite ore mined tailings subjected to repeated beneficiation are mainly gangue mineral powder, mainly quartz and contain a small amount of calcium fluoride.

And the cooling mode in the third step is a rapid cooling mode.

The decomposition rate of the limestone is 90%.

The sandstone is hard sandstone.

in conclusion, the lead-zinc slag is utilized, and the lead-zinc slag contains higher Fe₂O₃the lead-free cement clinker iron correction material can be used as a cement clinker iron correction material, and meanwhile, the problem of great environmental pollution caused by residual heavy metal lead can be avoided; utilizing CaF in waste residue after repeated ore dressing of fluorite ore₂And high-sulfur coal in cement clinker calcinationSO generated in the process₃The composite mineralizer is formed, so that the low-temperature calcination of cement clinker is realized, and the heat consumption of the clinker is reduced; improving clinker strength (especially early strength of low alkali clinker); the performance of clinker is improved; simultaneously adding sulfur in coalThe mineral form is fixed in clinker to reduce the cyclic enrichment of sulfur, relieve the skinning and blocking of a kiln tail system, reduce the process accidents of the kiln system and realize the use of high-sulfur coal as fuel in the novel dry cement calcination process.

It is to be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.