Method for producing energy-saving cement

Abstract

The application discloses an energy-saving cement production method and belongs to the technical field of cement production. The method comprises the following steps: (1) raw material treatment; (2) contaminated soil pretreatment, to obtain pretreated contaminated soil; (3) clinker preparation: the pretreated contaminated soil is mixed with raw materials and calcined; and (4) cement preparation. The method can properly treat the contaminated soil, recycle the waste pollutants, reduce secondary pollution, and significantly reduce energy consumption by replacing part of raw materials with the contaminated soil and adding extra heat in the calcination process of the cement clinker due to the organic matter contained in the contaminated soil.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cement production, in particular to a production method of energy-saving cement. BACKGROUND

[0002] With the continuous development of economic development and urbanization process, a large amount of contaminated soil is generated. With the continuous improvement of environmental protection policy requirements, the disposal methods such as landfill and incineration have certain limitations, and are extremely likely to cause secondary pollution, which cannot meet the requirements of waste disposal, so it is inevitable to seek effective contaminated soil disposal technology.

[0003] The cement kiln co-disposes contaminated soil by utilizing the characteristics of high temperature, long residence time, stable incineration state, good turbulence, alkaline environment, no waste residue discharge, and good waste gas treatment effect in the cement kiln. The physical properties such as compressive strength, flexural strength and standard consistency of the clinker calcined in the process of disposing contaminated soil will change to some extent, so it is necessary to carry out application research on contaminated soil in clinker calcination, to reduce the influence on clinker calcination and cement product performance while disposing contaminated soil. At present, the cement kiln co-disposes contaminated soil by adding it during raw material batching to realize raw material replacement, on the one hand to recover waste, and on the other hand to reduce cost. However, many contaminated soils are complex contaminated soils containing organic pollutants and heavy metal pollutants, which are equivalent to hazardous waste. During the clinker calcination process, the flue gas generated usually exceeds the standard of organic pollutants, so the use of this kind of contaminated soil in the production process of cement is greatly limited. Therefore, many cement production enterprises directly give up using contaminated soil when detecting that it contains organic pollutants.

[0004] Cement production is one of the high energy consumption industries. In the production process, pyrolysis and calcination of clinker are needed, and the main energy consumption comes from traditional energy sources such as coal, fuel oil and electricity. It is a general trend for cement enterprises to increase the use of alternative raw fuels. If solid waste can be converted into usable resources to replace part of the raw materials in the preparation process of cement, and energy consumption is reduced, it will greatly benefit the green transformation and upgrading of cement enterprises. SUMMARY

[0005] The purpose of the present application is to solve the above-mentioned problems existing in the prior art, and to provide a production method of energy-saving cement. By replacing part of the raw materials with contaminated soil, the present application not only properly disposes contaminated soil, recycles waste resources, and reduces secondary pollution, but also increases additional heat in the calcination process of cement clinker due to the presence of organic matter in contaminated soil, thereby significantly reducing energy consumption.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0007] The application discloses a production method of energy-saving cement, which comprises the following steps:

[0008] (1) raw material treatment: limestone, mudstone, shale, iron ore, diatomite and coal gangue are ground, dried and mixed to obtain mixed raw materials;

[0009] (2) contaminated soil pretreatment: the contaminated soil is crushed and dried, then an additive liquid containing ammonium carbonate and urea is added, and the mixture is uniformly mixed and heated for heat treatment, the heat treatment temperature is 200-250 DEG C, the heat treatment time is 10-20 min, and then the mixture is cooled, ferrocene is added and mixed and ground to obtain pretreated contaminated soil;

[0010] (3) clinker preparation: the pretreated contaminated soil is mixed with the mixed raw materials and calcined to obtain cement clinker;

[0011] (4) cement preparation: the cement clinker, gypsum and fly ash are mixed and ground to obtain energy-saving cement.

[0012] Further, the weight parts of each raw material in the production method of energy-saving cement are as follows: limestone 50-70 parts, mudstone 10-15 parts, shale 5-10 parts, iron ore 2-10 parts, diatomite 3-5 parts, coal gangue 1-5 parts and pretreated contaminated soil 5-10 parts.

[0013] Further, the additive liquid in step (2) is prepared by adding ammonium carbonate and urea into water and dissolving and uniformly mixing, the mass fraction of ammonium carbonate in the additive liquid is 5-10%, the mass fraction of urea in the additive liquid is 3-8%, and the additive liquid is added in an amount of 5-10% of the weight of the dried contaminated soil.

[0014] Further, the ferrocene is added in an amount of 1-3% of the weight of the dried contaminated soil in step (2).

[0015] Further, in step (3), the calcination temperature of the cement clinker is 850-1200 DEG C.

[0016] Further, in step (4), the cement clinker, gypsum and fly ash are mixed in an amount of 85-95 parts, 2-5 parts and 5-10 parts by weight respectively.

[0017] Further, the contaminated soil contains heavy metals and organic matters.

[0018] Further, the organic matters include oil and fat.

[0019] Further, the organic matters include benzene and polycyclic aromatic hydrocarbons.

[0020] The application has the following beneficial effects:

[0021] 1. This invention utilizes contaminated soil mixed with raw materials to replace part of the raw materials, reducing raw material costs. It is estimated that the direct material cost per ton of clinker decreases by approximately 0.5 yuan / ton. The contaminated soil contains a certain amount of organic matter, which can reduce fuel consumption. Experiments show that electricity consumption per ton of clinker decreases by approximately 0.6 kWh, resulting in a reduction in electricity costs of approximately 0.6 * 0.6² = 0.37 yuan / ton. Coal consumption does not decrease significantly, but clinker strength increases significantly. The increased clinker strength reduces the clinker consumption ratio by approximately 1.4%, saving about 2.17 yuan / ton of cement. It is evident that this invention achieves the goal of energy conservation and consumption reduction in cement production.

[0022] 2. Through the treatment of this invention, heavy metals in contaminated soil are solidified and stably retained in clinker minerals, achieving harmless treatment of waste, eliminating waste discharge, and eliminating the risk of secondary pollution; at the same time, organic pollutants in contaminated soil are transformed into inorganic compounds under high temperature conditions, and the high temperature airflow fully contacts the alkaline materials with high fineness, high concentration, high adsorption, and high uniformity distribution, effectively inhibiting the emission of acidic substances, so that sulfur and chlorine are converted into inorganic salts and fixed.

[0023] 3. This invention pretreats contaminated soil by first heat-treating it with a mixture of urea and ammonium carbonate at a certain temperature. This causes the soil to disintegrate, increasing its porosity. On one hand, the increased volume and porosity of the contaminated soil improve the calcination efficiency of subsequent processes, increasing the decomposition rate of organic matter and reducing organic pollutants in the flue gas. Simultaneously, it promotes clinker burning, increases heat, and reduces energy consumption. On the other hand, the increased porosity allows for better integration of subsequently added ferrocene. During clinker calcination, the ferrocene undergoes micro-explosions within the pores of the contaminated soil, resulting in more complete combustion of organic matter and ensuring that the flue gas meets emission standards. Furthermore, experiments have shown that the combined treatment of contaminated soil with the additive solution and ferrocene enables better solidification of heavy metals in the finished cement product. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments.

[0025] The contaminated soil used in the following examples and comparative examples was selected from the soil of the West Plot of Nannan Aluminum Co., Ltd. The contaminated soil contains heavy metals and organic matter, including oils, benzene, and polycyclic aromatic hydrocarbons.

[0026] Example 1

[0027] The production method of energy-saving cement includes the following steps:

[0028] (1) Raw material treatment: 600 kg of limestone, 120 kg of mudstone, 70 kg of shale, 60 kg of iron ore, 40 kg of diatomite and 30 kg of coal gangue were weighed and mixed, and then ground, dried and mixed to obtain mixed raw material;

[0029] (2) Contaminated soil pretreatment: ammonium carbonate and urea were dissolved in water to obtain an auxiliary liquid, the mass fraction of ammonium carbonate in the auxiliary liquid was 7%, and the mass fraction of urea in the auxiliary liquid was 5%; the contaminated soil was crushed and dried, then the auxiliary liquid was added, the addition amount of the auxiliary liquid was 8% of the weight of the dried contaminated soil, and after mixing uniformly, the temperature was raised for heat treatment, the heat treatment temperature was 210°C, the heat treatment time was 10 min, and after cooling, ferrocene was added and mixed and ground, the addition amount of ferrocene was 2% of the weight of the dried contaminated soil, to obtain pretreated contaminated soil;

[0030] (3) Clinker preparation: 80 kg of pretreated contaminated soil was mixed with the mixed raw material prepared in step (1) and calcined at a temperature of 1000°C, and cement clinker was obtained after cooling;

[0031] (4) Cement preparation: 920 kg of cement clinker, 40 kg of gypsum and 70 kg of fly ash were weighed and mixed and ground to obtain energy-saving cement.

[0032] Example 2

[0033] The production method of the energy-saving cement comprises the following steps:

[0034] (1) Raw material treatment: 700 kg of limestone, 130 kg of mudstone, 90 kg of shale, 90 kg of iron ore, 50 kg of diatomite and 30 kg of coal gangue were weighed and mixed, and then ground, dried and mixed to obtain mixed raw material;

[0035] (2) Contaminated soil pretreatment: ammonium carbonate and urea were dissolved in water to obtain an auxiliary liquid, the mass fraction of ammonium carbonate in the auxiliary liquid was 8%, and the mass fraction of urea in the auxiliary liquid was 6%; the contaminated soil was crushed and dried, then the auxiliary liquid was added, the addition amount of the auxiliary liquid was 7% of the weight of the dried contaminated soil, and after mixing uniformly, the temperature was raised for heat treatment, the heat treatment temperature was 220°C, the heat treatment time was 15 min, and after cooling, ferrocene was added and mixed and ground, the addition amount of ferrocene was 3% of the weight of the dried contaminated soil, to obtain pretreated contaminated soil;

[0036] (3) Clinker preparation: 90 kg of pretreated contaminated soil was mixed with the mixed raw material prepared in step (1) and calcined at a temperature of 1100°C, and cement clinker was obtained after cooling;

[0037] (4) Cement preparation: take 900 kg of cement clinker, 45 kg of gypsum and 80 kg of fly ash, mix and grind to obtain energy-saving cement.

[0038] Example 3

[0039] The production method of the energy-saving cement comprises the following steps:

[0040] (1) Raw material treatment: take 550 kg of limestone, 110 kg of mudstone, 60 kg of shale, 30 kg of iron ore, 35 kg of diatomite and 20 kg of coal gangue, grind, dry and mix the weighed limestone, mudstone, shale, iron ore, diatomite and coal gangue to obtain mixed raw materials;

[0041] (2) Contaminated soil pretreatment: add ammonium carbonate and urea to water to dissolve and mix to obtain an additive solution, the mass fraction of ammonium carbonate in the additive solution is 6%, and the mass fraction of urea in the additive solution is 6%; after the contaminated soil is crushed and dried, the additive solution is added, the additive solution is added in an amount of 9% of the weight of the dried contaminated soil, and after uniform mixing, heat treatment is carried out at a temperature of 250°C for 10 min, and then cooled, ferrocene is added and mixed and ground, the ferrocene is added in an amount of 1% of the weight of the dried contaminated soil, to obtain pretreated contaminated soil;

[0042] (3) Clinker preparation: mix 70 kg of pretreated contaminated soil with the mixed raw materials prepared in step (1) and calcine at a temperature of 1200°C, and after cooling, obtain cement clinker;

[0043] (4) Cement preparation: take 850 kg of cement clinker, 25 kg of gypsum and 65 kg of fly ash, mix and grind to obtain energy-saving cement.

[0044] Example 4

[0045] The production method of the energy-saving cement comprises the following steps:

[0046] (1) Raw material treatment: take 550 kg of limestone, 110 kg of mudstone, 60 kg of shale, 30 kg of iron ore, 35 kg of diatomite and 20 kg of coal gangue, grind, dry and mix the weighed limestone, mudstone, shale, iron ore, diatomite and coal gangue to obtain mixed raw materials;

[0047] (2) Contaminated soil pretreatment: adding ammonium carbonate and urea into water to dissolve and mix to obtain an additive solution, the mass fraction of ammonium carbonate in the additive solution is 10%, the mass fraction of urea in the additive solution is 8%; after the contaminated soil is crushed and dried, the additive solution is added, the additive solution is added in an amount of 5% of the weight of the dried contaminated soil, after mixing uniformly, heat treatment is carried out by heating, the heat treatment temperature is 200°C, the heat treatment time is 20 min, cooling, adding ferrocene and mixing and grinding, the ferrocene is added in an amount of 2.5% of the weight of the dried contaminated soil, to obtain pretreated contaminated soil;

[0048] (3) Clinker preparation: 95 kg of pretreated contaminated soil is mixed with the mixed raw material prepared in step (1) and calcined at a temperature of 850°C, and cement clinker is obtained after cooling;

[0049] (4) Cement preparation: 890 kg of cement clinker, 35 kg of gypsum and 70 kg of fly ash are weighed and mixed and ground to obtain energy-saving cement.

[0050] Comparative Example 1

[0051] The production method of cement comprises the following steps:

[0052] (1) Raw material treatment: 600 kg of limestone, 120 kg of mudstone, 70 kg of shale, 60 kg of iron ore, 40 kg of diatomite and 30 kg of coal gangue are weighed and ground, dried and mixed to obtain mixed raw material;

[0053] (2) Clinker preparation: the mixed raw material is calcined at a temperature of 1000°C, and cement clinker is obtained after cooling;

[0054] (3) Cement preparation: 920 kg of cement clinker, 40 kg of gypsum and 70 kg of fly ash are weighed and mixed and ground to obtain cement.

[0055] Comparative Example 2

[0056] The production method of energy-saving cement comprises the following steps:

[0057] (1) Raw material treatment: 600 kg of limestone, 120 kg of mudstone, 70 kg of shale, 60 kg of iron ore, 40 kg of diatomite and 30 kg of coal gangue are weighed and ground, dried and mixed to obtain mixed raw material;

[0058] (2) Contaminated soil pretreatment: add ammonium carbonate and urea into water to dissolve and mix to obtain an additive solution, the mass fraction of ammonium carbonate in the additive solution is 7%, the mass fraction of urea in the additive solution is 5%; after the contaminated soil is crushed and dried, the additive solution is added, the additive solution is added in an amount of 8% of the weight of the dried contaminated soil, after mixing uniformly, heat treatment is carried out, the heat treatment temperature is 210℃, the heat treatment time is 15 min, and after cooling, the pretreated contaminated soil is obtained;

[0059] (3) Clinker preparation: 80 kg of the pretreated contaminated soil is mixed with the mixed raw material prepared in step (1) and calcined at a temperature of 1000℃, and after cooling, cement clinker is obtained;

[0060] (4) Cement preparation: 920 kg of the cement clinker, 40 kg of gypsum and 70 kg of fly ash are weighed and mixed and ground to obtain the energy-saving cement.

[0061] Comparative Example 3

[0062] The production method of the energy-saving cement comprises the following steps:

[0063] (1) Raw material treatment: 600 kg of limestone, 120 kg of mudstone, 70 kg of shale, 60 kg of iron ore, 40 kg of diatomite and 30 kg of coal gangue are weighed and ground, dried and mixed to obtain mixed raw material;

[0064] (2) Contaminated soil pretreatment: after the contaminated soil is crushed and dried, ferrocene is added and mixed and ground, the ferrocene is added in an amount of 2% of the weight of the dried contaminated soil, and the pretreated contaminated soil is obtained;

[0065] (3) Clinker preparation: 80 kg of the pretreated contaminated soil is mixed with the mixed raw material prepared in step (1) and calcined at a temperature of 1000℃, and after cooling, cement clinker is obtained;

[0066] (4) Cement preparation: 920 kg of the cement clinker, 40 kg of gypsum and 70 kg of fly ash are weighed and mixed and ground to obtain the energy-saving cement.

[0067] Comparative Example 4

[0068] The production method of the energy-saving cement comprises the following steps:

[0069] (1) Raw material treatment: 600 kg of limestone, 120 kg of mudstone, 70 kg of shale, 60 kg of iron ore, 40 kg of diatomite and 30 kg of coal gangue are weighed and ground, dried and mixed to obtain mixed raw material;

[0070] (2) Pollution soil pretreatment: the pollution soil is crushed and dried to obtain pretreated pollution soil;

[0071] (3) Clinker preparation: 80 kg of pretreated pollution soil is mixed with the mixed raw material prepared in step (1) and calcined at a temperature of 1000 DEG C, and after cooling, cement clinker is obtained;

[0072] (4) Cement preparation: 920 kg of cement clinker, 40 kg of gypsum and 70 kg of fly ash are weighed and mixed and ground to obtain energy-saving cement.

[0073] Related data analysis:

[0074] I. Production energy consumption and related technical index comparison test data analysis of example 1, comparative example 1 and comparative example 4 are shown in table 1 as follows:

[0075] Table 1

[0076]

[0077] From the data in table 1, it can be seen that comparative example 4 uses pollution soil compared with comparative example 1, the power consumption per ton of clinker is reduced, although the standard coal consumption is not much different, but the compressive strength of the clinker is obviously improved, which indirectly achieves the purpose of energy saving and consumption reduction. Example 1 increases the pretreatment process of pollution soil compared with comparative example 4, the power consumption per ton of clinker is significantly reduced, which shows that the heat can be significantly increased after the pollution soil is treated.

[0078] II. Comparison and analysis of heavy metal content:

[0079] The ICP-MS heavy metal detection results (PPM) of the pollution soil of example 1, comparative examples 2-4 are shown in table 2 as follows:

[0080] Table 2

[0081]

[0082] From table 2, it can be seen that the pollution soil used in the present application contains heavy metals, and the content of heavy metals is relatively high.

[0083] According to the method for determination of leachable heavy metals in cement mortar in GB / T 30810-2014, the pollution soil of example 1, comparative examples 2-4 is leached and the concentration of each heavy metal is detected, and the results (mg / L) are shown in table 3 as follows:

[0084] Table 3

[0085]

[0086] From table 3, it can be seen that the leaching solution of the pollution soil used in the present application contains a large amount of heavy metals, which shows that there is a great risk of heavy metal leaching when directly used or landfilled.

[0087] The cement clinkers prepared in Example 1 and Comparative Examples 2-4 were leached and detected according to the method for determination of leachable heavy metals in cement mortar in GB / T 30810-2014, and the results (mg / L) are shown in Table 4 below:

[0088] Table 4

[0089]

[0090] As can be seen from Table 4, the heavy metal leaching amount of the cement clinker after the treatment of Example 1 of the present application is very low, which meets the requirements of the comprehensive wastewater discharge standard and can be used with confidence; while the detected contents of some heavy metals in the leachate of Comparative Examples 2-4 are relatively high, which has a certain risk of secondary pollution. It can be seen that the present application can better solidify heavy metals by pretreating the contaminated soil.

[0091] III. Detection of Organic Pollutants

[0092] 1. Detection of Organic Matter in Contaminated Soil and Clinker

[0093] The contaminated soil of Example 1 and Comparative Examples 2-4 was taken to detect volatile organic compounds according to HJ 605-2011 “Determination of Volatile Organic Compounds in Soil and Sediment by Purge and Trap / Gas Chromatography-Mass Spectrometry” of the Ministry of Environmental Protection, and the results (mg / kg) are shown in Table 5.

[0094] Table 5

[0095]

[0096] As can be seen from Table 5, the content of benzene volatile organic compounds in the contaminated soil used in the present application is relatively high, which has a greater pollution.

[0097] The cement clinker prepared in Example 1 and Comparative Examples 2-4 was taken to detect volatile organic compounds according to HJ 605-2011 “Determination of Volatile Organic Compounds in Soil and Sediment by Purge and Trap / Gas Chromatography-Mass Spectrometry” of the Ministry of Environmental Protection, and the results (mg / kg) are shown in Table 6.

[0098] Table 6

[0099]

[0100] As can be seen from Table 6, the content of benzene volatile organic compounds in the cement clinker after the treatment of Example 1 of the present application is very low, which meets the standard requirements; while the content of some benzene volatile organic compounds in the cement clinker of Comparative Examples 2-4 is relatively high, which has a pollution risk.

[0101] The contaminated soil prepared in Example 1, Comparative Examples 2-4 was detected for semi-volatile organic compounds polycyclic aromatic hydrocarbons according to the method of US EPA8260, and the results (mg / kg) are shown in Table 7.

[0102] Table 7

[0103]

[0104] As shown in Table 7, the polycyclic aromatic hydrocarbons content in the contaminated soil used in the application is high, and the pollution is serious.

[0105] The cement clinker prepared in Example 1, Comparative Examples 2-4 was detected for semi-volatile organic compounds polycyclic aromatic hydrocarbons according to the method of US EPA8260, and the results (mg / kg) are shown in Table 8.

[0106] Table 8

[0107]

[0108] As shown in Table 8, after the treatment of Example 1, the semi-volatile organic compounds polycyclic aromatic hydrocarbons content in the cement clinker is very low, which meets the standard requirements, and the determination values of other types of polycyclic aromatic hydrocarbons are all <0.1 mg / kg, so they are not shown in the table.

[0109] 2, tail gas detection

[0110] The cement clinker calcination tail gas of Example 1, Comparative Examples 2-4 was detected for benzene volatile organic compounds according to the air and waste gas monitoring analysis method, and the results (mg / m 3 ) are shown in Table 9.

[0111] Table 9

[0112]

[0113] As shown in Table 9, after the treatment of Example 1, the benzene volatile organic compounds content in the cement clinker calcination tail gas is very low, which meets the requirements of the atmospheric pollutants comprehensive emission standard of the Ministry of Environmental Protection; while the benzene volatile organic compounds content in the cement clinker tail gas prepared in Comparative Examples 2-4 is high, which has pollution risk.

[0114] The cement clinker calcination tail gas of Example 1, Comparative Examples 2-4 was detected for semi-volatile organic compounds polycyclic aromatic hydrocarbons according to the air and waste gas monitoring analysis method, and the results (mg / m 3 ) are shown in Table 10.

[0115] Table 10

[0116]

[0117] As shown in Table 10, the content of semi-volatile organic matter in the cement clinker calcination tail gas after the treatment of the embodiment 1 of the present application is very low, which meets the requirements of the atmospheric pollutants comprehensive emission standard of the Ministry of Environmental Protection; while the content of semi-volatile organic matter polycyclic aromatic hydrocarbon in the cement clinker tail gas prepared by the comparative examples 2-4 is high, which has a great pollution risk.

[0118] In summary, after the treatment of the present application, the content of organic pollutants in the contaminated soil is very low in the cement clinker and the tail gas, which meets the environmental protection requirements. Meanwhile, by the pretreatment of the contaminated soil, the present application can fully utilize the organic matter contained in the contaminated soil, improve the combustion efficiency during the calcination of the cement clinker, and make the organic pollutants burn more fully, which not only significantly improves the removal rate of the organic pollutants, but also increases the heat and reduces the energy consumption of the cement production.

[0119] Although the present application has been disclosed with the above preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make some modifications and improvements without departing from the spirit and scope of the present application, so the protection scope of the present application is defined by the claims.

Claims

1. A method for producing energy-saving cement, characterized by, It comprises the following steps: (1) raw material treatment: limestone, mudstone, shale, iron ore, diatomite and coal gangue are ground, dried and mixed to obtain mixed raw material; (2) contaminated soil pretreatment: the contaminated soil is crushed and dried, then an additive liquid containing ammonium carbonate and urea is added, mixed uniformly, heated and treated, the heating temperature is 200-250℃, the heating time is 10-20min, cooled, then ferrocene is added, mixed and ground to obtain pretreated contaminated soil; the contaminated soil contains heavy metals and organic matter; (3) clinker preparation: the pretreated contaminated soil is mixed with the mixed raw material and calcined, then cooled to obtain cement clinker; (4) cement preparation: the cement clinker, gypsum and fly ash are mixed and ground to obtain energy-saving cement.

2. The method of producing energy-saving cement according to claim 1, characterized by, The weight parts of each raw material are as follows: limestone 50-70 parts, mudstone 10-15 parts, shale 5-10 parts, iron ore 2-10 parts, diatomite 3-5 parts, coal gangue 1-5 parts, pretreated contaminated soil 5-10 parts.

3. The method of producing energy-saving cement according to claim 1, characterized by, The preparation method of the additive liquid in step (2) is as follows: ammonium carbonate and urea are dissolved in water and mixed uniformly, the mass fraction of ammonium carbonate in the additive liquid is 5-10%, the mass fraction of urea in the additive liquid is 3-8%, and the addition amount of the additive liquid is 5-10% of the weight of the dried contaminated soil.

4. The method of producing energy-efficient cement according to claim 1, characterized in that: The addition amount of ferrocene in step (2) is 1-3% of the weight of the dried contaminated soil.

5. The method of producing energy-efficient cement according to claim 1, characterized in that: In step (3), the calcination temperature of the cement clinker is 850-1200℃.

6. A method of producing energy-efficient cement according to claim 1, characterized in that: In step (4), the weight parts of cement clinker, gypsum and fly ash are as follows: 85-95 parts, 2-5 parts and 5-10 parts respectively.

7. A method of producing energy-efficient cement according to claim 1, characterized in that: The organic matter includes oil and fat.

8. A method of producing energy-efficient cement according to claim 1, characterized in that: The organic matter includes benzene and polycyclic aromatic hydrocarbons.

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