CN109956684B - Production method of ultra-low potassium active fine lime - Google Patents
Production method of ultra-low potassium active fine lime Download PDFInfo
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- CN109956684B CN109956684B CN201711499850.0A CN201711499850A CN109956684B CN 109956684 B CN109956684 B CN 109956684B CN 201711499850 A CN201711499850 A CN 201711499850A CN 109956684 B CN109956684 B CN 109956684B
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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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
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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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/108—Treatment or selection of the fuel therefor
Abstract
The invention provides a production method of ultra-low potassium active refined lime, which is characterized by comprising the steps of preparing a surfactant, pretreating raw materials, preheating, calcining and reprocessing semi-finished products to obtain the ultra-low potassium active refined lime. The invention can effectively remove silt and impurities of the limestone by controlling the granularity of the crushed limestone and adding the surfactant to screen, float and wash the limestone raw material, thereby greatly reducing the introduction of K into the limestone raw material+、SO42‑And Cl‑And the content of harmful impurities; the activity of the prepared ultra-low potassium refined lime is improved to more than 430ml, the content of calcium oxide is more than or equal to 92 percent, harmful elements such as sulfur content is less than 0.01 percent, carbon content is less than 0.02 percent, and K is+≤100ppm、SO42‑≤400ppm、Cl‑Less than or equal to 10ppm, and the 325-mesh passing rate of the grinding active fine lime is more than 95 percent.
Description
Technical Field
The invention belongs to the technical field of chemical smelting, and particularly relates to a production method of ultra-low potassium active fine lime.
Background
The active refined lime with ultralow potassium content is a main and necessary raw material for producing high-end sodium hypophosphite, and the sodium hypophosphite is an ideal reducing agent and is mainly used for chemical nickel plating, copper and tin plating, preparation of organic synthesis catalysts, food processing and fresh keeping, engineering plastic stabilizers and the like. The chemical industry requires that the calcium oxide is more than or equal to 92 percent, the activity degree is more than or equal to 350ml, the sulfur content is less than or equal to 0.01 percent, the carbon content is less than or equal to 0.02 percent, and the K is+≤100ppm、SO42- ≤400ppm、Cl- Less than or equal to 10ppm, the 325-mesh pass rate of the ground active fine lime is more than 95 percent, the effective calcium content and the activity of the lime are high, the content of harmful impurities in the lime is low, the active lime produced at present can meet the requirements of other industries in the aspects of calcium oxide, sulfur, carbon content and activity, but the harmful impurities such as K are contained in the active lime+、SO42-、Cl-The method can not meet the requirements of the field of fine chemical new materials and is used for preparing the new materials such as high-end sodium hypophosphite and raw materials of PVC heat stabilizerAnd (4) requiring.
Chinese patent ZL201510231514.2 discloses a method for producing high-efficiency active lime, which comprises washing limestone raw material with water, removing silt, other impurities and crushed stone therein, pulverizing, and sieving; then adding the prepared additive (dispersing agent, coupling agent, chlorate and the like which are uniformly mixed) and the raw material limestone into a mixer for uniformly mixing; secondly, preheating the limestone mixture at 680-720 ℃ for 5-10 min; and finally, feeding the preheated limestone mixture into a rotary kiln body, wherein the rotating speed of the rotary kiln is 2.7-3.2 r/min, the temperature is raised to 1210-1300 ℃ by adopting bituminous coal spraying, and the calcining time is 200 min. And cooling the calcined lime to obtain a finished product. The method has the following defects: harmful impurity elements are not thoroughly removed in the processes of crushing, washing and screening raw materials; meanwhile, the control of the technological parameters such as the calcining temperature, the calcining time, the kiln rotating speed and the like in the calcining process is unreasonable, so that harmful impurity elements such as K in the lime discharged from the kiln are easily caused+、SO42- 、Cl-The content is high, and the application of the active lime in the production of new fine chemical material products cannot be met.
Disclosure of Invention
The invention aims to provide a production method of ultra-low potassium active refined lime, aiming at reducing harmful element K in active lime+、SO42-The content of impurities.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a production method of ultra-low potassium active fine lime comprises the following steps:
step 1) preparation of a surfactant: weighing sodium fatty acid, sodium carbonate and a dispersing agent in a mass ratio of 1:1:1:1 to mix into a uniform solution;
step 2) raw material pretreatment: crushing, floating, washing and screening limestone as a raw material; flotation and washing are carried out on the raw materials by adding the surfactant prepared in the step 1), so that impurities such as silt and lime chips of the limestone raw materials are completely removed, and meanwhile, part of harmful elements in the raw materials are removed;
step 3), preheating: preheating the limestone in the step 2), wherein the temperature is 680-720 ℃, and the preheating time is 220-260 min;
step 4) calcining: feeding the preheated limestone in the step 3) into a rotary kiln body, wherein the rotating speed of the rotary kiln is 0.57-0.77 r/min, the temperature is raised to 1350-; rapidly cooling the discharged lime in a vertical preheater by adopting a forced air supply mode;
step 5), reprocessing of semi-finished products: screening the semi-finished active lime in the step 4), adding a chelating dispersant, grinding and winnowing to obtain the ultra-low potassium refined lime.
Further, the dispersant in the step 1) is a synthetic high molecular polymer or a chelating dispersant.
Further, the particle size of the limestone raw material in the step 2) is 10-30 mm.
Further, the dosage of the surfactant in the step 2) is 8.0-12.0 ten thousandth of the mass of the limestone.
Further, the preheating temperature in the step 3) is 700-; preferably, the preheating temperature is 700 ℃ and the preheating time is 240 min.
Preferably, the rotating speed of the rotary kiln in the step 4) is 0.67 r/min; feeding into rotary kiln, heating to 1400 deg.C, and calcining for 90 min.
Furthermore, in the step 4), the bituminous coal is prepared from less than or equal to 0.5wt% of sulfur, more than or equal to 35wt% of volatile matter, less than or equal to 8wt% of ash, more than or equal to 6000J/kg of heat productivity, less than or equal to 5wt% of pulverized coal fineness, less than or equal to 1 wt% of water and 200 meshes of particle size.
Further, the chelating dispersant added in the step 5) is 1.0-3.0 ten thousandth of the mass of lime.
Further, the activity of the ultra-low potassium refined lime is improved to more than 430ml, the content of calcium oxide is more than or equal to 92 percent, harmful elements such as sulfur content is less than 0.01 percent, carbon content is less than 0.02 percent, and K is added+≤100ppm、SO42- ≤400ppm、Cl-Less than or equal to 10ppm, and the 325-mesh passing rate of the grinding active fine lime is more than 95 percent.
The invention has the following beneficial effects:
1. by controlling the granularity of the crushed limestone and adding the surfactant to screen, float and wash the limestone raw material, the silt and impurities of the limestone can be effectively removed, and the introduction of K into the limestone raw material is greatly reduced+、SO42-And Cl-And the content of harmful impurities.
2. The production process has the advantages that the low-sulfur, high-volatile and low-ash bituminous coal is ground into 200-mesh coal powder, the spray combustion technology and the slow calcining method are adopted, the kiln speed is controlled to be 0.57-0.77 r/min, and the produced active lime has high effective calcium content and high activity.
3. By sieving and separating the semi-finished active lime, adding a dispersant for grinding and winnowing, the activity, the dispersibility and the fluidity of the refined lime are further improved, and the K in the active lime is reduced+、SO42-And Cl-Harmful element content, and is favorable for pneumatic transmission.
4. The prepared ultra-low potassium active fine lime can be used as a raw material for professional production of high-end sodium hypophosphite in the field of fine chemical engineering.
Detailed Description
The invention is illustrated below with reference to specific examples.
Example 1
A production method of ultra-low potassium active fine lime comprises the following steps:
step 1) preparation of a surfactant: weighing sodium aliphatate, fatty acid, sodium carbonate and chelating dispersant in a mass ratio of 1:1:1:1, and mixing to obtain a uniform solution;
step 2) raw material pretreatment: crushing, floating, washing and screening raw limestone, and floating and washing the raw limestone by adding a surfactant with the mass of 10.0 ten-thousandth of the mass of the limestone, so that impurities such as silt, lime chips and the like of the raw limestone are completely removed, and meanwhile, part of harmful elements in the raw material are removed; selecting limestone with the granularity of 20 mm;
step 3), preheating: preheating the limestone in the step 2) at 700 ℃ for 240 min;
step 4) calcining: feeding the preheated limestone in the step 3) into a rotary kiln body, wherein the rotary speed of the rotary kiln is 0.67 r/min, the temperature is raised to 1400 ℃ by adopting bituminous coal spraying, and the calcining time is 90 min; rapidly cooling the discharged lime in a vertical preheater by adopting a forced air supply mode;
step 5), reprocessing of semi-finished products: screening the semi-finished active lime in the step 4), adding a chelating dispersant with the mass of 2.0 ten thousandth of the lime, grinding, and winnowing to obtain the ultra-low potassium refined lime.
In the step 4), the bituminous coal is prepared from less than or equal to 0.5wt% of sulfur, more than or equal to 35wt% of volatile components, less than or equal to 8wt% of ash, more than or equal to 6000J/kg of heat productivity, less than or equal to 5wt% of pulverized coal fineness, less than or equal to 1 wt% of water and 200 meshes of particle size.
Example 2
A production method of ultra-low potassium active fine lime comprises the following steps:
step 1) preparation of a surfactant: weighing sodium aliphatate, fatty acid, sodium carbonate and chelating dispersant in a mass ratio of 1:1:1:1, and mixing to obtain a uniform solution;
step 2) raw material pretreatment: crushing, floating, washing and screening raw limestone, and floating and washing the raw limestone by adding a surfactant with the mass of 12.0 ten-thousandth of the mass of the limestone, so that impurities such as silt, lime chips and the like of the raw limestone are completely removed, and meanwhile, part of harmful elements in the raw material are removed; selecting limestone with the granularity of 30 mm;
step 3), preheating: preheating the limestone in the step 2) at 720 ℃ for 260 min;
step 4) calcining: feeding the preheated limestone in the step 3) into a rotary kiln body, wherein the rotary speed of the rotary kiln is 0.77 r/min, the temperature is raised to 1450 ℃ by adopting bituminous coal spraying, and the calcining time is 100 min; rapidly cooling the discharged lime in a vertical preheater by adopting a forced air supply mode;
step 5), reprocessing of semi-finished products: screening the semi-finished active lime in the step 4), and then adding 3.0 ten-thousandth of the mass of the lime for grinding and winnowing to obtain the ultra-low potassium refined lime.
In the step 4), the bituminous coal is prepared from less than or equal to 0.5wt% of sulfur, more than or equal to 35wt% of volatile components, less than or equal to 8wt% of ash, more than or equal to 6000J/kg of heat productivity, less than or equal to 5wt% of pulverized coal fineness, less than or equal to 1 wt% of water and 200 meshes of particle size.
Example 3
A production method of ultra-low potassium active fine lime comprises the following steps:
step 1) preparation of a surfactant: weighing sodium aliphatate, fatty acid, sodium carbonate and chelating dispersant in a mass ratio of 1:1:1:1 to mix into a uniform solution;
step 2) raw material pretreatment: crushing, floating, washing and screening raw limestone, and floating and washing the raw limestone by adding 10 ten-thousandth of surfactant of the mass of the limestone, so as to completely remove impurities such as silt, lime chips and the like of the raw limestone and remove part of harmful elements in the raw material; selecting limestone with the granularity of 20 mm;
step 3), preheating: preheating limestone in the step 2), wherein the temperature is 710 ℃, and the preheating time is 220 min;
step 4) calcining: feeding the preheated limestone in the step 3) into a rotary kiln body, wherein the rotary speed of the rotary kiln is 0.67 r/min, the temperature is raised to 1420 ℃ by adopting bituminous coal spraying, and the calcining time is 85 min; rapidly cooling the discharged lime in a vertical preheater by adopting a forced air supply mode;
step 5), reprocessing of semi-finished products: screening the semi-finished active lime in the step 4), and then adding 1.5 ten-thousandth of the mass of the lime for grinding and winnowing to obtain the ultra-low potassium refined lime.
In the step 4), the bituminous coal is prepared from less than or equal to 0.5wt% of sulfur, more than or equal to 35wt% of volatile components, less than or equal to 8wt% of ash, more than or equal to 6000J/kg of heat productivity, less than or equal to 5wt% of pulverized coal fineness, less than or equal to 1 wt% of water and 200 meshes of particle size.
The physicochemical data of the raw materials of examples 1 to 3 are shown in Table 1, and the physicochemical test data of the prepared refined lime are shown in Table 2.
TABLE 1 physicochemical data for limestone
TABLE 2 physicochemical test data of the prepared lime
Claims (7)
1. The production method of the ultra-low potassium active fine lime is characterized by comprising the following steps:
step 1) preparation of a surfactant: weighing sodium fatty acid, sodium carbonate and a dispersing agent in a mass ratio of 1:1:1:1 to mix into a uniform solution;
step 2) raw material pretreatment: crushing, floating, washing and screening limestone as a raw material; flotation and washing are carried out on the raw materials by adding the surfactant prepared in the step 1), so that sand, lime stone fragments and other impurities of the lime stone raw materials are completely removed, and meanwhile, part of harmful elements in the raw materials are removed;
step 3), preheating: preheating the limestone in the step 2), wherein the preheating temperature is 680-720 ℃, and the preheating time is 220-260 min;
step 4) calcining: feeding the preheated limestone in the step 3) into a rotary kiln body, wherein the rotating speed of the rotary kiln is 0.57-0.77 r/min, the temperature is raised to 1350-; rapidly cooling the discharged lime in a vertical cooler in a forced air supply mode;
step 5), reprocessing of semi-finished products: screening the semi-finished active lime in the step 4), adding a chelating dispersant, grinding and winnowing to obtain the ultra-low potassium refined lime.
2. The method for producing active refined lime with ultra-low potassium as claimed in claim 1, wherein the particle size of the limestone raw material in step 2) is 10-30 mm.
3. The method for producing active refined lime with ultra-low potassium content as claimed in claim 1, wherein the amount of the surfactant used in step 2) is 8.0-12.0 ten-thousandths of the mass of the limestone.
4. The method for producing the ultra-low potassium active fine lime according to claim 1, wherein in the step 4), bituminous coal is used with sulfur of not more than 0.5wt%, volatile components of not less than 35wt%, ash of not more than 8wt%, calorific value of not less than 6000J/kg, coal fines of not more than 5wt%, water of not more than 1 wt%, and particle size of 200 mesh.
5. The method for producing refined lime with ultra-low potassium activity as claimed in claim 1, wherein the chelating dispersant added in step 5) is 1.0-3.0 ten thousandths of the lime mass.
6. The method for producing ultra-low potassium active refined lime according to claim 1, wherein the dispersant is a synthetic high molecular polymer or a chelating dispersant.
7. The method for producing active refined lime with ultra-low potassium content as claimed in claim 1, wherein the active degree of the active refined lime with ultra-low potassium content is high, the content of available calcium is large, the internal pore space is large, the reaction speed is fast, the content of harmful impurity elements is low, specifically, the active degree is increased to more than 430ml, the content of available calcium oxide is more than or equal to 92%, the sulfur content is less than 0.01%, the carbon content is less than 0.02%, K is less than K+≤100ppm、SO42- ≤ 400ppm、Cl-Less than or equal to 10 ppm; the specific surface area of the grinding active refined lime is large, and the passing rate of a 325-mesh sieve is more than 95 percent.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04193746A (en) * | 1990-11-26 | 1992-07-13 | Osaka Koukai Kk | Hard burnt lime granular body and its manufacture and method for using the same to heat insulation of high temperature molten metal |
| CN104844020A (en) * | 2015-05-08 | 2015-08-19 | 湖南衡山皕成钙业有限公司 | Method for producing high-efficient active lime |
| CN107206393A (en) * | 2014-12-01 | 2017-09-26 | 德国钾盐集团股份有限公司 | The method of collecting agent selective floation kainite from mineral intermixture is used as by the use of sulfated fatty acid |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04193746A (en) * | 1990-11-26 | 1992-07-13 | Osaka Koukai Kk | Hard burnt lime granular body and its manufacture and method for using the same to heat insulation of high temperature molten metal |
| CN107206393A (en) * | 2014-12-01 | 2017-09-26 | 德国钾盐集团股份有限公司 | The method of collecting agent selective floation kainite from mineral intermixture is used as by the use of sulfated fatty acid |
| CN104844020A (en) * | 2015-05-08 | 2015-08-19 | 湖南衡山皕成钙业有限公司 | Method for producing high-efficient active lime |
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Effective date of registration: 20220118 Address after: 421300 Pingtang Road, Jinlong Industrial Park, Kaiyun Town, Hengshan County, Hengyang City, Hunan Province Patentee after: Hunan Bi into Polytron Technologies Inc. Address before: 421000 household 601, No. 22, Zhangfei lane, Yanfeng District, Hengyang City, Hunan Province Patentee before: Deng Jinying |
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