阅读说明：本技术 一种新型干法水泥窑高效催化脱硫材料及其生产方法 (Novel dry-process cement kiln efficient catalytic desulfurization material and production method thereof ) 是由 钟读乐 孙彦民 南军 曲晓龙 李世鹏 苏少龙 孟广莹 马月谦 曾贤君 张利杰 冯 于 2020-10-17 设计创作，主要内容包括：本发明公开了一种用于新型干法水泥窑的高效催化脱硫材料及其生产方法。本发明方法现奖各催化剂依次充分溶解后得到复合催化剂,其中复合催化剂溶液组分及组分质量含量为2-5w％的蔗糖,0.5-1w％的硝酸铁,0.2-0.5w％的硝酸铈,0.3-0.8w％的硝酸镧,0.5-1.0w％的硝酸锰,剩余为水；再将生石灰和复合催化剂溶液通过三级消解池进行消解,其中一级消解池内生石灰与复合催化剂的质量比例为1：0.43-0.47,依次经过二级和三级消解反应,经过三级充分消解后,利用旋风分离器筛分出目数大于325目的产品即为高效催化脱硫材料。本发明一种用于新型干法水泥窑的高效催化脱硫材料,充分利用各元素在氢氧化钙的原位催化作用,提高氢氧化钙与二氧化硫的反应速率和效率,达到高效催化脱硫的目的。(The invention discloses a high-efficiency catalytic desulfurization material for a novel dry-process cement kiln and a production method thereof. According to the method, all catalysts are fully dissolved in sequence to obtain the composite catalyst, wherein the mass content of the components of the composite catalyst solution is 2-5 w% of sucrose, 0.5-1 w% of ferric nitrate, 0.2-0.5 w% of cerium nitrate, 0.3-0.8 w% of lanthanum nitrate, 0.5-1.0 w% of manganese nitrate, and the balance of water; and digesting the quicklime and the composite catalyst solution through a three-stage digestion tank, wherein the mass ratio of the quicklime to the composite catalyst in the one-stage digestion tank is 1: 0.43 to 0.47, and performing secondary and tertiary digestion reaction in sequence, and after the third-stage full digestion, screening out a product with the mesh number larger than 325 meshes by using a cyclone separator, namely the high-efficiency catalytic desulfurization material. The invention relates to a high-efficiency catalytic desulfurization material for a novel dry-process cement kiln, which fully utilizes the in-situ catalytic action of each element in calcium hydroxide, improves the reaction rate and efficiency of the calcium hydroxide and sulfur dioxide, and achieves the aim of high-efficiency catalytic desulfurization.)

1. A production method of a high-efficiency catalytic desulfurization material for a novel dry-process cement kiln, which is characterized in that,

1) fully dissolving the catalysts in sequence to obtain a composite catalyst, wherein the mass content of the components of the composite catalyst solution is 2-5 w% of sucrose, 0.5-1 w% of ferric nitrate, 0.2-0.5 w% of cerium nitrate, 0.3-0.8 w% of lanthanum nitrate, 0.5-1.0 w% of manganese nitrate, and the balance of water;

2) digesting the quicklime and the composite catalyst solution through a three-stage digestion tank, wherein the mass ratio of the quicklime to the composite catalyst in the one-stage digestion tank is 1: 0.43 to 0.47, performing second-level and third-level digestion reactions in sequence after first-level digestion, and screening out products with the mesh number larger than 325 meshes by using a cyclone separator after third-level full digestion, namely the high-efficiency catalytic desulfurization material.

2. The method for producing a high-efficiency catalytic desulfurization material for a novel dry cement kiln, according to claim 1, wherein the composite catalyst solution is prepared by adding water, sucrose, ferric nitrate, cerium nitrate, lanthanum nitrate and manganese nitrate in the order, and the composite catalyst solution should be used within 24 hours.

3. A high efficiency catalytic desulfurization material for a novel dry cement kiln produced according to the method of claim 1 or 2.

4. The use of the high efficiency catalytic desulfurization material of claim 3 in a novel dry cement kiln, wherein the high efficiency catalytic desulfurization material is added at the raw meal elevator.

Technical Field

The invention relates to the field of cement additives, in particular to a novel dry-process cement kiln high-efficiency catalytic desulfurization material and a production method thereof.

Background

At present, the atmospheric pollutant emission standard of cement industry enterprises (DB44/818-³The sulfur dioxide concentration is less than or equal to 35mg/Nm when the ultra-low emission standard of Henan province is implemented³With the increasingly strict environmental requirements, the concentration requirement of sulfur dioxide in the flue gas of the cement kiln is gradually reduced, and each cement enterprise faces severe tests. Thus, the solution ofThe problem of sulfur dioxide emission of the dry-method cement kiln becomes the first major affairs of enterprises.

At present, the treatment methods of sulfur dioxide mainly comprise an ammonia method, a wet calcium method, composite desulfurization and the like. CN206474005U discloses a cement kiln flue gas desulfurization tower, adopts the wet-type calcium method, and this tower has adopted the multichannel spraying circulation pipeline of different flow, makes the slurry circulating pump flow adjustable, has reduced the running cost of enterprise. CN205308125U discloses a cement kiln flue gas ammonia desulfurization system, and aqueous ammonia is spouted into between the whirlwind section of cement kiln preheater through the high-pressure pump, utilizes the basicity of aqueous ammonia to reach the purpose of desulfurization. CN205392134U discloses a novel compound sulfur fixation system for dry cement production line, which comprises a sulfur fixation system and a desulfurization system. CN105779074A discloses a calcium-based catalytic desulfurizer for cement kilns, which comprises calcium hydroxide, calcium oxide, iron oxide, magnesium oxide, barium carbonate and rare element compounds, and is added into the kiln along with cement raw materials to reduce the concentration of sulfur dioxide discharged by flue gas of the cement kiln. At present, the cement flue gas desulfurization has the following problems: (1) the investment of wet calcium desulphurization equipment is large, and the investment of the wet desulphurization system for the construction of 4500T/D cement enterprises is 1000 ten thousand. (2) The ammonia method is seriously corroded, and the pipeline of a preheater of the cement kiln is easily blocked due to large spraying amount, so that the normal production is influenced. (3) The desulfurization efficiency of calcium-based substances such as calcium oxide and the like sprayed by a dry method is low, and the dosage of the agent is large, and the difficulty of uniform compounding is large. (4) The composite desulfurization system adopts the combination of a dry method and an ammonia method, but the corrosion problem still exists. The invention provides a high-efficiency catalytic desulfurization material, wherein a catalyst is attached to a calcium agent desulfurization material, and the surface activity of the calcium agent desulfurization material is improved by changing a preparation process, so that the desulfurization material with higher desulfurization efficiency is obtained.

Disclosure of Invention

The invention aims to provide a novel high-efficiency catalytic desulfurization material for a dry-process cement kiln and a production method thereof.

The invention relates to a high-efficiency catalytic desulfurization material for a novel dry-process cement kiln, which fully utilizes the in-situ catalytic action of each element in calcium hydroxide, improves the reaction rate and efficiency of the calcium hydroxide and sulfur dioxide, and achieves the aim of high-efficiency catalytic desulfurization.

The invention discloses a production method of a high-efficiency catalytic desulfurization material for a novel dry-process cement kiln, which comprises the following steps:

1) fully dissolving the catalysts in sequence to obtain a composite catalyst, wherein the mass content of the components and components of the composite catalyst solution is 2-5 w% of sucrose, 0.5-1 w% of ferric nitrate, 0.2-0.5 w% of cerium nitrate, 0.3-0.8 w% of lanthanum nitrate, 0.5-1.0 w% of manganese nitrate, and the balance of water;

2) digesting quicklime and a composite catalyst solution through a three-stage digestion tank, wherein the mass ratio of the quicklime to the composite catalyst in the first-stage digestion tank is 1: 0.43 to 0.47, performing second-level and third-level digestion reactions in sequence after first-level digestion, and screening out a product with the mesh number larger than 325 meshes by using a cyclone separator after third-level full digestion, namely the high-efficiency catalytic desulfurization material.

In the production method, the adding sequence of the catalyst is water, sucrose, ferric nitrate, nitric acid, lanthanum nitrate and manganese nitrate when the composite catalyst solution is prepared, and the composite catalyst solution is used within 24 hours.

The invention also provides the high-efficiency catalytic desulfurization material for the novel dry-process cement kiln, which is produced by the production method.

The invention further provides the application of the high-efficiency catalytic desulfurization material in a novel dry-process cement kiln, wherein the high-efficiency catalytic desulfurization material is added at a raw material hoister and enters the kiln together with raw materials to achieve the aim of desulfurization.

The invention discloses a high-efficiency catalytic desulfurization material for a novel dry-process cement kiln and a production method thereof. The high-efficiency catalytic desulfurization material fully utilizes the in-situ catalytic action of each element in calcium hydroxide, improves the reaction rate and efficiency of the calcium hydroxide and sulfur dioxide, and achieves the aim of high-efficiency catalytic desulfurization.

Detailed Description

To further illustrate the technical features of the present invention, the following examples are listed.

Example 1

2 w% of sucrose, 0.5 w% of ferric nitrate, 0.5 w% of cerium nitrate, 0.3 w% of lanthanum nitrate, 0.5 w% of manganese nitrate and the balance of water in the composite catalyst solution, digesting the quick lime and the composite catalyst solution by a three-stage digestion tank, wherein the mass ratio of the quick lime to the composite catalyst solution in the first-stage digestion tank is 1: 0.43, performing second-level and third-level digestion and full reaction in sequence, and after the third-level digestion, screening out a product with the number of more than 325 meshes by using a cyclone separator, namely the high-efficiency catalytic desulfurization material, wherein the number is the example 1.

Example 2

3 w% of sucrose, 1 w% of ferric nitrate, 0.2 w% of cerium nitrate, 0.5 w% of lanthanum nitrate, 0.8 w% of manganese nitrate and the balance of water in the main composite catalyst solution, digesting the quicklime and the composite catalyst solution by a three-stage digestion tank, wherein the mass ratio of the quicklime to the composite catalyst solution in the first-stage digestion tank is 1: 0.45, performing second-level and third-level digestion and full reaction in sequence, and after the third-level digestion, screening out a product with the number of more than 325 meshes by using a cyclone separator, namely the high-efficiency catalytic desulfurization material, wherein the number is the example 2.

Example 3

4 w% of sucrose, 0.7 w% of ferric nitrate, 0.4 w% of cerium nitrate, 0.8 w% of lanthanum nitrate, 1.0 w% of manganese nitrate and the balance of water in the composite catalyst solution, digesting the quicklime and the composite catalyst solution by a three-stage digestion tank, wherein the mass ratio of the quicklime to the composite catalyst solution in the first-stage digestion tank is 1: 0.47, performing second-level and third-level digestion and full reaction in sequence, and after the third-level digestion, screening out a product with the number of more than 325 meshes by using a cyclone separator, namely the high-efficiency catalytic desulfurization material, wherein the number is the example 3.

Evaluation experiment of desulfurization Effect

The sulfur dioxide concentration in the existing 4500T/D production line of a cement plant in Henan province is monitored to be 220-260mg/Nm³The raw material input amount is 390T/h, and the sulfur content in the raw material is 0.18 percent. The high efficiency catalytic desulfurization materials of the present invention prepared in examples 1 to 3 were added to conduct tests, and the specific results are shown in the following table.

TABLE 1 desulfurization during the test