CN114854984B - Preparation method and application method of composite binder for producing oxidized pellets - Google Patents
Preparation method and application method of composite binder for producing oxidized pellets Download PDFInfo
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- CN114854984B CN114854984B CN202210384694.8A CN202210384694A CN114854984B CN 114854984 B CN114854984 B CN 114854984B CN 202210384694 A CN202210384694 A CN 202210384694A CN 114854984 B CN114854984 B CN 114854984B
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- pellets
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a preparation method and an application method of a composite binder for producing oxidized pellets, and belongs to the technical field of binders. Uniformly mixing sodium lignin sulfonate and sodium carbonate to obtain a mixture; mixing the mixture with water, stirring and dissolving to obtain a mixture solution A; sodium bicarbonate is placed in distilled water to prepare sodium bicarbonate solution with the concentration of 5-15 g/L; then adding sodium pyrophosphate into the sodium bicarbonate solution, and stirring until the sodium pyrophosphate is completely dissolved to obtain a mixed solution B; and adding the mixed solution B into the mixed solution A, stirring and then evaporating to dryness to obtain the composite binder for producing the oxidized pellets. The composite binder is used for pelletizing in limonite powder, and can effectively improve pellet strength in each stage.
Description
Technical Field
The invention relates to a preparation method and an application method of a composite binder for producing oxidized pellets, and belongs to the technical field of binders.
Background
The pellet is one of the artificial lump material producing process, and is prepared through mixing finely ground iron concentrate powder or other iron-containing powder with small amount of additive, rolling in a pelletizer to form pellet, drying and roasting to obtain spherical iron-containing material with metallurgical performance and certain strength. Among these, there are three general types of pellet firing processes: (1) roasting in a shaft kiln; (2) a belt-type roasting machine process; (3) grate-rotary kiln process.
Early foreign scholars studied to find that the reduction rate of sintered ore prepared from pellets was faster than the reduction rate of lump ore or sintered ore prepared from the same raw material. The pellet process can be divided into three stages, and the first stage of pellet process development is a 120t daily output test plant established in 1926 by Krupp company. In the second stage of the pellet method development, in 1944, minnesota university mine laboratory stations published the first study result that made a significant breakthrough in the pellet technology. In 1951, research on the belt roasting machine was started by the research mining company, and in 1955, the shaft furnace pellet mill was also started to be put into production, and in this stage, the pellet method was developed very rapidly. From the beginning of the 80 s of the 20 th century, the third stage of the pellet process development has been entered, and at the same time, the development concept of the pellet process has been changed from focusing on the productivity to focusing on the product quality, cost reduction, improvement of the process, and the like. Therefore, the development of the pellet method can be generally started in the following two aspects: (1) improving the mineral composition of the pellets; (2) searching for novel binders.
Proper binder is required to be added in the production of the pellets, and if the binder is not added, the pellets can not be formed into pellets, or the pellets have unstable performance. Although bentonite has been generally used as a binder, if it is added in an excessive amount, the grade of pellets is lowered, and thus it has been found that research on a novel pellet binder to replace bentonite or to lower the amount of bentonite is one of the effective methods for improving the grade of pellet iron. Among them, organic binders have many advantages, such as: small usage amount, small residual amount in finished balls, and the like, but also has the problems of high price of part of organic binders, increased production cost of enterprises, and the like.
Sodium lignin sulfonate is a byproduct of waste liquid produced in the paper industry, is a natural high molecular compound, has a molecular structure containing a large number of functional groups such as hydroxyl, carboxyl and the like, and accords with the molecular structure of an ideal organic binder proposed by most scholars. In addition, sodium lignin sulfonate is an anionic polymer, can generate electrostatic attraction force with metal ions on the surface of minerals, and has strong adsorption force. Its market price is about 1050 yuan/ton, its price is much lower than other organic binders, for example its price is 1/10 of the price of carboxymethyl cellulose and 1/4 of the price of industrial starch.
The research on the action mechanism of sodium lignin sulfonate in pellet ore and test thereof, ding, discloses that the use of sodium lignin sulfonate with mass fraction of 0.75% to partially replace bentonite for producing pellets can reduce the dosage of bentonite from 2% to 0.75%. Sodium lignin sulfonate with mass fraction of 0.5% and calcium carbonate with mass fraction of 0.75% are used as composite binders to completely replace bentonite, and the falling strength of the produced pellet green pellets, the compressive strength of the dried pellets, the compressive strength of the preheated pellets and the compressive strength of the baked pellets are respectively as follows: 4.2/(0.5 m), 11.5N/min, 23.7N/min, 522.5N/min and 2610.3N/min. The prior art adopts sodium lignin sulfonate to modify to obtain the composite organic binder, so that the production cost is reduced, but the strength of the prepared pellets in each stage can only meet the minimum requirement of production, and the technical problem is that how to find a new composite organic binder, reduce the cost and improve the strength of the pellets in each stage.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention provides a preparation method and an application method of a composite binder for producing oxidized pellets. Firstly, sodium lignosulfonate and sodium carbonate are mixed to prepare a mixture solution A, sodium bicarbonate and sodium pyrophosphate are prepared to prepare a mixture solution B, the mixture solution A and the mixture solution B are mutually mixed and evaporated to dryness to obtain the composite binder. The invention is realized by the following technical scheme.
A method for preparing a composite binder for producing oxidized pellets, comprising the following steps:
step 1, sodium lignin sulfonate and sodium carbonate are mixed according to the mass ratio of 5-7:1-3, uniformly mixing to obtain a mixture; mixing the mixture with water, stirring and dissolving to obtain a mixture solution A, wherein the concentration of sodium lignin sulfonate in the mixture solution A is 110-130g/L;
step 2, sodium bicarbonate is placed in distilled water to prepare sodium bicarbonate solution with the concentration of 5-15 g/L; then adding sodium pyrophosphate into the sodium bicarbonate solution, and stirring until the sodium pyrophosphate is completely dissolved to obtain a mixed solution B, wherein the solid-to-liquid ratio of the sodium pyrophosphate to distilled water in the step 2 is 9-12:1g/L;
step 3, adding the mixture solution A obtained in the step 1 according to the volume ratio of 0.5-0.8: and 0.75-1.05 of the mixed solution B obtained in the step 2 is added, stirred for 20-40min at the temperature of 50-70 ℃, and then evaporated to dryness to obtain the composite binder for producing the oxidized pellets.
An application method of a composite binder prepared by a preparation method of a composite binder for producing oxidized pellets comprises the following steps:
the limonite powder and the composite binder are mixed according to the mass ratio of 20:1, uniformly mixing to obtain a mineral powder mixture, pelletizing the mineral powder mixture to obtain green pellets with the granularity of 8-16 mm, and respectively drying, preheating and roasting the green pellets to obtain the finished pellets.
The pelletizing is performed in a disc pelletizer with the rotating speed of 6-8 r/min.
The beneficial effects of the invention are as follows: the composite binder prepared by the invention acts on limonite powder to pelletize, and the falling strength of the green pellets, the compressive strength of the dried pellets, the compressive strength of the preheated pellets and the compressive strength of the finished pellets are respectively as follows: 5.1-6.3 times/(0.5 m), 44.5-75.6N/each, 80.4-96.6N/each, 704.5-810.3N/each and 3501.6-3821.4N/each pellet stage, the pellet strength is effectively improved, the standard requirement of the pellet ore in production is met, and the production utilization rate of limonite powder is improved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and detailed description.
Example 1
As shown in fig. 1, the preparation method of the composite binder for producing oxidized pellets comprises the following steps:
step 1, sodium lignin sulfonate and sodium carbonate are mixed according to the mass ratio of 7:3, uniformly mixing to obtain a mixture; mixing and stirring the mixture with water to obtain a mixture solution A, wherein the concentration of sodium lignin sulfonate in the mixture solution A is 130g/L;
step 2, sodium bicarbonate is placed in distilled water to prepare sodium bicarbonate solution with the concentration of 5 g/L; then adding sodium pyrophosphate into the sodium bicarbonate solution, and stirring until the sodium pyrophosphate is completely dissolved to obtain a mixed solution B, wherein the solid-to-liquid ratio of the sodium pyrophosphate to distilled water in the step 2 is 12:1g/L;
step 3, adding the mixture solution A obtained in the step 1 according to the volume ratio of 0.8:1.05 adding the mixed solution B obtained in the step 2, stirring for 40min at 50 ℃, and then evaporating to dryness to obtain the composite binder for producing the oxidized pellets.
The application method of the composite binder prepared by the preparation method of the composite binder for producing the oxidized pellets comprises the following steps:
the limonite powder and a composite binder (the composite binder is sodium lignin sulfonate with improved compatibility of sodium carbonate, sodium bicarbonate and sodium pyrophosphate) are mixed according to the mass ratio of 20:1, uniformly mixing to obtain a mineral powder mixture, controlling the moisture of the mineral powder mixture to be 3%, and pelletizing the mineral powder mixture to obtain green pellets with the granularity of 8-16 mm; wherein the pelletizing is in a disc pelletizer with the rotating speed of 6-8 r/min;
drying the green pellets by blowing at 200deg.C for 10min, and air-extracting at 400deg.C for 10min to obtain dried pellets;
preheating the dried ball at 800 ℃ for 20min to obtain a preheated ball;
roasting the preheated pellets for 10min at 1200 ℃, and cooling the preheated pellets to below 150 ℃ by normal-temperature air to obtain finished pellets.
Comparative example 1
The preparation method of the modified sodium lignin sulfonate in the 'mechanism of action of sodium lignin sulfonate in pellet and experimental study':
(1) About 100ml of distilled water in a beaker was put into a thermostatic water bath at 80 ℃ and heated for a period of time, and then 10g of sodium lignin sulfonate was gradually added into the beaker and stirred well to disperse the sodium lignin sulfonate in the beaker.
(2) 100ml of distilled water is filled in another plastic cup, 15g of calcium carbonate is added, the mixture is placed into a constant-temperature water bath kettle to be heated, and is subjected to electromagnetic stirring for 10min, and then sodium hexametaphosphate solution is added into the calcium carbonate suspension, and is stirred for 20min, so that the calcium carbonate is completely dispersed in the water.
(3) Slowly adding the completely dispersed calcium carbonate suspension into the sodium lignosulfonate solution, fully stirring, and evaporating to dryness to obtain a light yellow mixture, namely the modified sodium wood.
The modified sodium wood prepared in comparative example 1 was subjected to the conditions for production according to example 1 of the present invention: pelletizing the modified sodium ligninsulfonate which is 0.5% of the weight of limonite powder and limonite powder to obtain green pellets with the granularity of 8-16 mm, wherein the moisture in the green pellets is controlled to be 3%;
drying the green pellets by blowing at 200deg.C for 10min, and air-extracting at 400deg.C for 10min to obtain dried pellets;
preheating the dried ball at 800 ℃ for 20min to obtain a preheated ball;
roasting the preheated pellets for 10min at 1200 ℃, and cooling the preheated pellets to below 150 ℃ by normal-temperature air to obtain finished pellets.
Example 2
As shown in fig. 1, the preparation method of the composite binder for producing oxidized pellets comprises the following steps:
step 1, sodium lignin sulfonate and sodium carbonate are mixed according to the mass ratio of 5:1, uniformly mixing to obtain a mixture; mixing and stirring the mixture with water to obtain a mixture solution A, wherein the concentration of sodium lignin sulfonate in the mixture solution A is 110g/L;
step 2, sodium bicarbonate is placed in distilled water to prepare sodium bicarbonate solution with the concentration of 15 g/L; then adding sodium pyrophosphate into the sodium bicarbonate solution, and stirring until the sodium pyrophosphate is completely dissolved to obtain a mixed solution B, wherein the solid-to-liquid ratio of the sodium pyrophosphate to distilled water in the step 2 is 9:1g/L;
step 3, adding the mixture solution A obtained in the step 1 according to the volume ratio of 0.5: and 0.75 of the mixed solution B obtained in the step 2 is added, stirred for 20min at the temperature of 70 ℃, and then evaporated to dryness to obtain the composite binder for producing the oxidized pellets.
The application method of the composite binder prepared by the preparation method of the composite binder for producing the oxidized pellets comprises the following steps:
the limonite powder and the composite binder are mixed according to the mass ratio of 20:1, uniformly mixing to obtain a mineral powder mixture, controlling the moisture of the mineral powder mixture to be 3%, and pelletizing the mineral powder mixture to obtain green pellets with the granularity of 8-16 mm; wherein the pelletizing is in a disc pelletizer with the rotating speed of 6-8 r/min;
drying the green pellets by blowing at 200deg.C for 10min, and air-extracting at 400deg.C for 10min to obtain dried pellets;
preheating the dried ball at 800 ℃ for 20min to obtain a preheated ball;
roasting the preheated pellets for 10min at 1200 ℃, and cooling the preheated pellets to below 150 ℃ by normal-temperature air to obtain finished pellets.
Example 3
As shown in fig. 1, the preparation method of the composite binder for producing oxidized pellets comprises the following steps:
step 1, sodium lignin sulfonate and sodium carbonate are mixed according to the mass ratio of 6:2, uniformly mixing to obtain a mixture; mixing and stirring the mixture with water to obtain a mixture solution A, wherein the concentration of sodium lignin sulfonate in the mixture solution A is 120g/L;
step 2, sodium bicarbonate is placed in distilled water to prepare sodium bicarbonate solution with the concentration of 10g/L; then adding sodium pyrophosphate into the sodium bicarbonate solution, and stirring until the sodium pyrophosphate is completely dissolved to obtain a mixed solution B, wherein the solid-to-liquid ratio of the sodium pyrophosphate to distilled water in the step 2 is 10:1g/L;
step 3, adding the mixture solution A obtained in the step 1 according to the volume ratio of 0.6: and 0.85 of the mixed solution B obtained in the step 2 is added, stirred for 30min at the temperature of 60 ℃, and then evaporated to dryness to obtain the composite binder for producing the oxidized pellets.
The application method of the composite binder prepared by the preparation method of the composite binder for producing the oxidized pellets comprises the following steps:
the limonite powder and the composite binder are mixed according to the mass ratio of 20:1, uniformly mixing to obtain a mineral powder mixture, controlling the moisture of the mineral powder mixture to be 3%, and pelletizing the mineral powder mixture to obtain green pellets with the granularity of 8-16 mm; wherein the pelletizing is in a disc pelletizer with the rotating speed of 6-8 r/min;
drying the green pellets by blowing at 200deg.C for 10min, and air-extracting at 400deg.C for 10min to obtain dried pellets;
preheating the dried ball at 800 ℃ for 20min to obtain a preheated ball;
roasting the preheated pellets for 10min at 1200 ℃, and cooling the preheated pellets to below 150 ℃ by normal-temperature air to obtain finished pellets.
The ball detection results in examples 1 to 3 and comparative example 1 are shown in table 1 below.
TABLE 1
As can be seen from Table 1, the green pellet dropping strength, the green pellet compressive strength, the dry pellet compressive strength, the preheated pellet compressive strength and the finished pellet compressive strength obtained by adopting the composite binder are all better, so that the pellet strength of each stage is effectively improved, the standard requirements of pellet production are met, and the production utilization rate of limonite powder is improved.
While the present invention has been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (2)
1. The production method of the oxidized pellet is characterized by comprising the following steps of:
the limonite powder and the composite binder are mixed according to the mass ratio of 20:1, uniformly mixing to obtain a mineral powder mixture, pelletizing the mineral powder mixture to obtain green pellets with the granularity of 8-16 mm, and respectively drying, preheating and roasting the green pellets to obtain finished pellets;
the preparation method of the composite adhesive comprises the following steps:
step 1, sodium lignin sulfonate and sodium carbonate are mixed according to the mass ratio of 5-7:1-3, uniformly mixing to obtain a mixture; mixing the mixture with water, stirring and dissolving to obtain a mixture solution A, wherein the concentration of sodium lignin sulfonate in the mixture solution A is 110-130g/L;
step 2, sodium bicarbonate is placed in distilled water to prepare sodium bicarbonate solution with the concentration of 5-15 g/L; then adding sodium pyrophosphate into the sodium bicarbonate solution, and stirring until the sodium pyrophosphate is completely dissolved to obtain a mixed solution B, wherein the solid-to-liquid ratio of the sodium pyrophosphate to distilled water in the step 2 is 9-12:1g/L;
step 3, adding the mixture solution A obtained in the step 1 according to the volume ratio of 0.5-0.8: and 0.75-1.05 of the mixed solution B obtained in the step 2 is added, stirred for 20-40min at the temperature of 50-70 ℃, and then evaporated to dryness to obtain the composite binder for producing the oxidized pellets.
2. The production method of oxidized pellets according to claim 1, characterized in that: the pelletizing is performed in a disc pelletizer with the rotating speed of 6-8 r/min.
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| WO2021197258A1 (en) * | 2020-03-30 | 2021-10-07 | 中南大学 | Oxidized pellet binding agent made from low-rank coal, preparation method for same, and applications thereof |
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2022
- 2022-04-13 CN CN202210384694.8A patent/CN114854984B/en active Active
Patent Citations (6)
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| RU2318866C1 (en) * | 2006-08-16 | 2008-03-10 | ООО "Эко-ТОП" | Fuel briquette fabrication process |
| CN103305300A (en) * | 2013-06-25 | 2013-09-18 | 三门峡中兴煤炭综合利用研究开发中心 | Binder special for producing coal briquettes from anthracite fines having greater than or equal to 80% of fixed carbon |
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| WO2021197258A1 (en) * | 2020-03-30 | 2021-10-07 | 中南大学 | Oxidized pellet binding agent made from low-rank coal, preparation method for same, and applications thereof |
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