WO2009052671A1

WO2009052671A1 - A new process for producing cement clinker by using sludge in hygrometric state and two-stage blending

Info

Publication number: WO2009052671A1
Application number: PCT/CN2007/003756
Authority: WO
Inventors: Xiaolin Yin
Original assignee: Xiaolin Yin
Priority date: 2007-10-26
Filing date: 2007-12-24
Publication date: 2009-04-30
Also published as: CN101172790A

Abstract

A new process for producing cement clinker by using sludge in hygrometric state and two-stage blending is provided. In this process, industrial waste residue which is filter pressed or dehydrated or drained off, or sludge which is sludge in city sewage or water treatment sludge, is used as raw material for producing cement. The raw material and raw fuel material which is blended in first-stage and pulverized are blended homogeneously in two-stage. The resulting material is made into rod shaped or globular, or lumpy by breaking, or sent into cement kiln directly and calcined after being dried by using afterheat. The clinker is obtained. The process is simple, can save a great deal of energy consume during drying and pulverizing, can utilize a great deal of sludge, can reduce the discharge of CO2, can save the resource of water and natural mineral, and can protect environment.

Description

New process for producing cement clinker by using secondary sludge of wet sludge waste residue

Technical field:

The invention relates to a new process technology of the cement industry in comprehensive utilization of resources, energy conservation and emission reduction and environmental protection, and particularly relates to energy saving of secondary ingredients for producing cement clinker by using aqueous industrial waste residue and urban sewage sludge and water treatment sludge ingredients New process technology methods.

Background technique:

For more than 100 years, the cement industry has been using single-stage ingredients in order to achieve uniform chemical composition of raw materials. The raw materials or raw materials and fuels of each component are combined with CaO, S i0 ₂ , A 1 ₂ 0., and Fe ₂ 0 _{3 .} The chemical composition of the composition requires the ingredients to be ground together to form a raw meal. In addition to the wet kiln process, which consumes too much energy, the raw material is milled to control the moisture of the raw material. The most important ball mill raw material must be dried. The vertical mill with hot blast stove allows the material moisture to reach about 12%, but the drying and grinding energy consumption is high, and they are not suitable for crushing sewage sludge, paper mill sludge, printing and dyeing textile sludge and other waste slag. A large amount of water-containing slag and sludge can be used as cement raw materials. The inorganic particles are more than 80% less than 200μηι, and most of the waste slag inorganic particles are basically lower than 80μηι, such as paper mill sludge, sewage sludge, etc., without grinding, only Mix well with the supplemental components.

With the development of the economy, on the one hand, basic construction requires a large amount of cement, while cement production consumes a large amount of limited limestone, clay resources and coal-fired resources. On the other hand, a large amount of S i 0 ₂ required for cement production, Wet sludge and waste residue of A 1 ₂ 0., Fe ₂ 0., CaO component and energy cannot be effectively utilized due to the limitations of existing process technology. It can only be landfilled, which wastes resources and seriously pollutes water and soil. Environment, a new process technology is urgently needed to solve the energy saving and environmental protection problems in the cement industry.

Summary of the invention: The technical problem to be solved by the invention is to solve the problem that the single-stage batching of the existing cement process technology is not conducive to the utilization of the waste sludge waste slag, and provide a simple process, less investment, and can save a lot of drying and grinding energy consumption, Water conservation and conservation of natural mineral resources, extensive use of sludge waste residue, emission reduction co ₂ , energy-saving and environmentally friendly new process for producing cement clinker using secondary sludge of wet sludge waste residue.

The technical scheme adopted by the invention is as follows: the wet industrial waste residue after the pressure filtration or after the dewatering or draining or the urban sewage sludge or the water treatment sludge is directly used as the raw material for producing the cement, and the other materials which are ground by the first batch of ingredients. The raw materials to be replenished are then subjected to secondary dry and wet ingredients, mixed and homogenized, and then formed into raw rods or raw balls or broken into pieces, which are sent to the cement kiln for burning mature materials.

In the above technical solution, the cement raw material ingredients are two-stage ingredients, according to the sludge residue chemical composition.

The content of S i0 ₂ , A1 ₂ 0 ₃ , Fe ₂ 0 ₃ , CaO, MgO, S0 ₃ , CI—, R ₂ 0 and the target design are silicate or aluminate or sulphoaluminate or sulphide For the design requirements of the main clinker, firstly add the siliceous raw materials, calcium raw materials, correcting raw materials and coal and mineralizers to be replenished to the raw material component A by first-stage metering, and then Mixing component A with wet sludge or waste slag by means of secondary metering, mixing and homogenizing, forming into raw rods or raw balls or being broken up, wet rods or wet balls or scattered The material block is directly sent into the cement kiln to burn the mature material, or after being dried by using waste heat, it is sent to the cement kiln to burn the mature material.

'The above-mentioned wet industrial waste slag refers to the sludge residue discharged from industrial production, such as sugar sludge from sugar factory, paper sludge from paper mill, PVC, PVA and fluororesin, calcium carbide slag discharged from acetylene gas production plant, and strontium salt factory. Production of discharged leaching residues, high organic matter sludge discharged from dyed textile bodies, waste sludge discharged from petrochemical plants, large amounts of sludge discharged from enterprises such as gold extraction and vanadium extraction, and sludge from water treatment in industrial enterprises. The moisture content of the wet industrial pulp or urban sewage sludge or water treatment sludge after the above-mentioned pressure filtration or after dewatering or draining is 15% to 85%.

The new process for producing cement by using the secondary sludge of wet sludge waste residue of the invention fully utilizes the inorganic component in the wet industrial waste residue or the urban sewage sludge or the water treatment sludge as the Portland cement or aluminate. Part or all of the raw material components of cement or sulphoaluminate cement or sulphide cement, and the energy of combustibles in the sludge slag is utilized, and one or more of the sludge slag may be used at the same time.

The above-mentioned raw material rod or raw material ball or bulk material block is used for the convenience of transportation and use of the cement kiln, and the roller extrusion molding machine is used to make the raw material rod or use the ball forming plate, the roll forming machine, various extrusions. The forming machine is made into a rod or a ball, or is mechanically broken into pieces.

Process equipment with mixed compaction or mixed grinding or mixing, including modified planetary wheel mill or other roller mixer, sand mixer or tandem disc, in the above-mentioned homogeneous mixing process equipment Grinding or other mixing machinery, the raw material is evenly mixed by mechanical forcing.

The above "siliceous raw materials" means clays, shale, coal ash, slag, vermiculite and other industrial wastes and inorganic minerals containing higher S i 0 ₂ ; calcium raw materials refer to limestone, slag and steel slag containing higher CaO Phosphorus slag and other industrial wastes and inorganic minerals; calibrated raw materials refer to the adjustment of suitable raw materials Ca0, S i 0 ₂ , A 1 ₂ 0 ₃ , FeA, SO, chemical composition added correction materials such as ore, high alumina , inorganic minerals, industrial waste residue, etc.; mineralizer refers to various types of mineralizers, seed crystals, combustion aids, coal-saving powder, sulfate, nitrate, chlorine added to improve clinker burning and reduce burning coal consumption. One or several kinds of salt, fluoride salt, permanganate, organic compound and industrial waste, tailings and clinker, and the amount of mineralizer is 0-25% of raw material. The percentage of each component of the above-mentioned medium-sized raw materials, one based on chemical analysis and industrial analysis of industrial waste or urban sewage sludge or water treatment sludge, and secondly, based on locally replenishable silicon raw materials and calcium Chemical analysis of raw materials, calibrated raw materials, and chemical analysis and industrial analysis of coal combustion, mineralizers, and third, according to the design requirements of the target clinker, such as designing silicate or designing aluminate clinker or designing sulphur aluminum The acid salt clinker or designed as pyrite clinker; the design requirements of the target clinker are based on the chemical analysis and industrial analysis of the used waste residue and the regional market determination of the product, the used waste residue and local raw material conditions and products. The market varies greatly; for the silicate clinker, the reasonable range of the three-rate value based on the raw material conditions is: KH 0. 80-1. 10 , N 1. 6-3. 2 , P0. 9- 3. 6; :, the raw material control of special clinker such as aluminate clinker, sulphoaluminate clinker and pyrite clinker varies from case to case.

The present invention has the following advantages:

1. Breaking through the traditional cement technology and equipment concept, with less investment, quick and effective effect, wide range of waste, and easy to achieve environmental standards.

^{2. It} can save a lot of drying and grinding energy consumption, and can process sludge residue containing a large amount of organic fiber, plastic and organic viscous materials.

3. It can make full use of the inorganic components and combustible energy in the sludge residue to reduce the consumption of limited natural minerals in the cement manufacturing industry, that is, reduce the consumption of limestone, clay, coal, etc., and save water resources. Reduce (0 ₂ emissions.

4. Can give full play to the potential advantages of the cement industry in environmental protection and waste, effectively burn out organic matter to eliminate organic pollution, and use aluminosilicate minerals to absorb and solidify heavy metal elements to eliminate heavy metal elements on aquatic organisms. Pollution.

detailed description: Technical points of the invention:

1. Using the wet sludge waste residue as the raw material component, according to the chemical analysis of the sludge residue and industrial analysis and particle size analysis, combined with the consumption characteristics of various types of cement in the regional market, determine the clinker type and clinker composition design. Program.

2. According to the analytical evaluation and clinker composition design scheme, select the appropriate raw materials for the elemental components to be supplemented.

3, using a two-stage batching scheme, firstly, the components to be replenished are firstly batch-milled into powder, and then the prepared powder and sludge sludge are mixed and homogenized by secondary batching, and then made into a convenient transport. And use the raw material rod or raw material ball, or break up the homogeneous material into a bulk material, directly into the cement kiln to burn the mature material, or use the waste heat to be dried and then sent to the cement kiln to burn the mature material.

Example 1: A cement corpse in Guangxi has 1 vertical kiln line and 1 rotary kiln line. Using the sugar filter mud of the local sugar factory, the sugar filter mud moisture is 29.4%, CaO 46.42%, Si0 ₂ 3.21%, Al ₂ 0 ₃ 4.12%, Fe ₂ 0 ₃ 0.89%, g05.72%, LOSS 39.26%, industrial analysis low calorific value 1580 χ 4.18KJ/kg, sugar filter material is sticky and difficult to dry. The trial production uses a two-stage batching process, which replaces all limestone ingredients with sugar filter mud. As a silicate clinker design, the supplementary element components are Si0 ₂ , A1 ₂ 0 ₃ , Fe ₂ 0, in order to facilitate the kiln firing. It does not affect the rotary kiln trial to add 2% coal (the vertical kiln usually uses 12% coal), and the coal ash is included in the composition design of the ingredients. In the trial production, the dry powder is made of coal ash, shale, sulphuric acid mud, manganese slag, and coal. After the first-grade metering and batching, the raw material is made into a dry powder by the ball mill. The fineness is 0.08 and the sieve residue is <12%; the dry powder and the sugar filter mud The secondary metering ingredients enter the pre-mixing of the twin-shaft mixer, the second-level metering ingredients, the weight percentage, the dry powder: the sugar filter mud = 25-50%: 75-50%, and then enter the homogenizer homogenization, after the homogenization, the mixture is sent The roller extrusion molding machine is formed into a Φ10 awake raw material rod, which is sent to the vertical kiln for calcination through the belt, and the clinker is 3 days. The compressive strength is 34.27 Pa, and the 28-day average compressive strength is 61.25 MPa. The clinker is ground and stabilized, the output of the shaft kiln is increased by 19%, and the coal consumption of clinker is reduced by 83.3%. The production line of the thousand-method rotary kiln is fed into the rotary kiln from the kiln tail through the vertical secondary lock air cylinder. The amount of the material rod accounts for 25% of the rotary kiln feed, and the pulverized coal injection volume of the kiln head and the decomposition furnace is reduced by 10%. The kiln condition is operating normally, the rotary kiln output is increased by 7%, and the clinker strength is increased by 9.7% on average.

Example 2: The sludge of a municipal sewage treatment plant in Hunan Province has a water content of 79.8% after draining. It is very difficult to dry and utilize. The average chemical analysis composition is Si0 ₂ 19.36%, Fe ₂ 0 ₃ 2.39%, Al ₂ 0 ₃ 6.47%, CaO 8.21%, MgO 0.73%, LOSS 62.35%, differential calorimeter measured average calorific value of 1359 4.18KJ / kg ₀ test using a two-stage batching process, the use of this sludge instead of clay siliceous raw materials and some calcium raw materials, As a silicate clinker design, the supplemental element components are mainly calcium. The first-grade ingredients are used to measure the limestone, steel slag and anthracite, and grind to 10-12% dry material with a fineness of 0.08 瞧, then pre-mix the dry powder and sludge for secondary metering and homogenize by homogenizer. , secondary metering ingredients, weight percentage, dry powder: sludge = 15 75%: 85-25%, formed into a Φ12 drawing rod by a roller extrusion molding machine, sent to the vertical kiln for calcination, the kiln output increased by 21.2%, The heat consumption of clinker decreased from 985 4.18 J/kg at normal batching to 668 χ 4.18 J/kg, the heat consumption of clinker decreased by 31.9%, the average strength of clinker was 29.74Mpa, the average strength of 28 days was 59.33Mpa, and the clinker was stable. Sexually qualified.

Example 3: A vertical resource kiln production line in a factory in Hunan Province, using calcium carbide slag in PVC production to replace limestone. The average moisture content of calcium carbide slag is 35%, the chemical composition dry content CaO content is 67.9%, Si0 ₂ 5.13%, Fe ₂ 0 2.32%, A1A 3.76%, CaO 3.42%, the target clinker is designed as silicate clinker, the rate control is KH0.95-1.05, n2.0 + 0. PI.8 ± 0.2, - the grade is made of silica sand , fly ash, steel slag, anthracite, mineralizer metering ingredients are ground by ball mill to make fineness 0.08mm sieve residue <14% raw meal dry powder, secondary batching using raw meal dry powder and wet carbide slag metering ingredients, secondary metering ingredients, weight percentage, dry powder: calcium carbide slag - 20-40%: 80- 60%, Pre-mixed, homogenized machine shielded, formed into cplOmm rod by extrusion molding machine, sent to vertical kiln calcination, vertical kiln output increased by about 50%, clinker heat consumption from 1100x4. lSU/kg down to 670 X 4.18KJ/kg clinker, heat consumption decreased by 39.1%, clinker safety was qualified, clinker three-month average 3-day average intensity 29.79 Pa, 28-day average strength 58.92MPa.

Claims

Rights request

1. A new process for producing cement clinker by using secondary sludge of wet sludge waste residue, characterized by using wet industrial waste or urban sewage sludge or water after pressure filtration or centrifugal or vacuum dewatering or draining The sludge is treated as a raw material for the production of cement, and other raw materials to be replenished after being pulverized by the first-stage ingredients, and then subjected to secondary dry-wet ingredients, mixed and homogenized, and then formed into raw rods or raw balls or The blocks are broken up and sent to a cement kiln for calcination into cement clinker.

2. A new process for producing cement clinker using wet sludge waste residue secondary furnish according to claim 1, characterized in that the cement raw meal ingredient is a two-stage ingredient: according to the chemical composition of the sludge residue The content and target of i0 ₂ , A1 ₂ 0 ₃ , Fe ₂ 0 ₃ , CaO, MgO, S0 ₃ , Cl P ₂ 0 ₅ , R ₂ 0, etc. are designed with silicate or aluminate or sulphoaluminate or sulfur The design requirements of ferrite-based clinker are firstly prepared by adding first-class metering ingredients such as siliceous raw materials, calcium raw materials, correcting raw materials and coal and mineralizers to be replenished. Part A; then component A is mixed with wet industrial waste or urban sewage sludge or water treatment sludge in a secondary ratio, and then mixed and homogenized, and then formed into raw rods or raw balls or After being broken up, the wet rod or wet material ball or bulk material block is directly sent into the cement kiln to burn the mature material, or after being dried by the waste heat, it is sent to the cement kiln to burn the mature material.

3. The novel process for producing cement clinker by using wet sludge residue secondary batching according to claim 1, characterized in that the wet industrial waste residue refers to sludge discharged from industrial production, including sugar of sugar factory. Filtration sludge, paper mill sludge from paper mills, PVC, PVA and fluororesin, calcium carbide slag discharged from acetylene gas production plant, leaching residue from sputum salt plant production, high organic matter sludge discharged from printing and dyeing textile mill, petrochemical plant A large amount of sludge discharged from waste sludge sludge, gold extraction and vanadium extraction, and sludge from industrial enterprises after water treatment.

4. The water content of the cement clinker or the urban sewage sludge or the water treatment sludge produced by the second batch of the wet sludge waste residue according to claim 1 is 15% - 85 ° /. .

5. The novel process for producing cement clinker by using wet sludge residue secondary batching according to claim 1, characterized in that inorganic component in industrial sludge or urban sewage sludge or water treatment sludge is used as silicon Part or all of the raw material components of cement or aluminate cement or sulphoaluminate cement or ferrite cement, and utilizing the combustible energy in the sludge residue, the sludge residue can be used at the same time one or more Kind.

6. The novel process for producing cement clinker by using wet sludge residue secondary batching according to claim 1, characterized in that the uniformly mixed raw material is rolled by a roller or a spherical disk or a roll forming The machine or other extrusion molding machine is made into a ball or a bar, or is mechanically broken into pieces.

7. The novel process for producing cement clinker by using wet sludge residue secondary batching according to claim 1, characterized in that the process equipment for mixing and homogenizing has a mixed rolling action or a mixed grinding action or a mixing action. Mechanical equipment, including corrected planetary wheel mill mixers or roller mixers, sand mixers or tandem disc mills or other mixing machines.

8. The novel process for producing cement clinker by using wet sludge residue secondary batching according to claim 1, characterized in that the siliceous raw material refers to clay, shale, coal ash containing higher S i0 ₂ . , slag, vermiculite and other industrial wastes and inorganic minerals; calcium raw materials refer to limestone, slag, steel slag, phosphorus slag and other industrial wastes and inorganic minerals with high CaO; corrected raw materials refer to the adjustment of suitable raw materials Ca0, S i Corrective materials added by chemical composition such as O, A A., Fe ₂ 0, and S0 ₃ , including slag, high alumina, inorganic minerals, and industrial waste; mineralizers are used to improve clinker burning and reduce firing Various types of mineralizers, seed crystals, combustion aids, coal-saving powder, sulfates added to coal consumption. One or several of nitrate, chloride, fluoride, permanganate, organic compounds and clinker, industrial waste, tailings, the amount of mineralizer is 0-25% of the raw meal.

9. The novel process for producing cement clinker using wet sludge waste residue secondary furnish according to claim 1, characterized in that the percentage of each component of the raw material two-stage ingredient is one, according to industrial waste or Chemical analysis and industrial analysis of municipal sewage sludge or water treatment sludge, and second, based on local replenishable siliceous raw materials, calcium raw materials, chemical analysis of calibrated raw materials, and chemical analysis and industrial analysis of coal combustion and mineralizers Third, according to the design requirements of the target clinker, such as designing silicate clinker or designing aluminate clinker or designing sulphoaluminate clinker or designing for pyrite clinker; target clinker The design requirements are based on the chemical analysis and industrial analysis of the waste residue used, and the regional market determination of the products. The used waste residue and local raw fuel conditions and product market vary greatly. For the silicate clinker, raw materials are used according to the original fuel conditions. A reasonable range of three rates is: H 0. 80-1. 10, N 1. 6-3. 2, P0. 9-3. 6; Special clinker such as aluminate clinker, sulphoaluminate clinker , raw material control of pyrite clinker The system varies from situation to situation.