CN108530038B - Anode furnace bottom protective lining composition - Google Patents
Anode furnace bottom protective lining composition Download PDFInfo
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- CN108530038B CN108530038B CN201810583795.1A CN201810583795A CN108530038B CN 108530038 B CN108530038 B CN 108530038B CN 201810583795 A CN201810583795 A CN 201810583795A CN 108530038 B CN108530038 B CN 108530038B
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/444—Halide containing anions, e.g. bromide, iodate, chlorite
- C04B2235/445—Fluoride containing anions, e.g. fluosilicate
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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Abstract
The invention discloses a furnace bottom protective lining composition of an anode furnace, which consists of the following raw materials in percentage by mass: magnesium-chromium aggregate: 55-65%, magnesium oxide powder: 25-35%, water glass: 12-18%, sodium fluosilicate: 8-12% of the amount of the water glass; when the protective lining is used, after the building of the anode furnace bottom brick is completed, the raw materials are weighed according to the proportion, stirred and mixed uniformly, coated on the surface of the anode furnace bottom brick, the thickness of the coating reaches 20-30 mm, the thickness is qualified, standing is carried out for natural maintenance for three days, namely, the protective lining is formed on the anode furnace bottom brick, and then the furnace is dried for 7-8 days according to the normal procedure, so that the protective lining can be opened for use; the invention has simple formula and convenient construction, the formed protective lining has thin thickness, strong heat conductivity and less heat transfer loss, can protect the furnace bottom brick of the anode furnace from continuously expanding in the blow-in production, closes the expansion joint before the furnace bottom protective lining is completely consumed, and effectively avoids the accident of furnace bottom brick damage caused by copper infiltration of the expansion joint during the blow-in of the anode furnace.
Description
Technical Field
The invention relates to the technical field of maintenance of anode furnaces, in particular to a furnace bottom protective lining composition of an anode furnace.
Background
The fixed anode furnace needs to be provided with expansion joints when the furnace bottom is built, and the specific method comprises the following steps: reserving an expansion joint with the width of 2-3 mm every 3-4 bricks, and filling paperboards in the joint. The expansion joint has the function of compensating expansion of the furnace bottom bricks after being heated, and avoiding furnace bottom deformation, furnace body deformation and even furnace bottom brick extrusion. And (3) baking the furnace after the anode furnace is built, wherein the time for use is 7-8 days, the hearth is gradually increased to 1300 ℃ from the room temperature, and the production is started after the baking is finished. The purpose of baking the furnace is to ensure that the furnace bottom bricks are fully expanded and an expansion joint is closed by gradually increasing the temperature of the furnace bottom bricks.
Practice shows that only a small part of the bottom expansion joint is closed after the baking oven is finished, and most of the bottom expansion joint is not closed. Normally, the furnace bottom expansion joint can be completely closed only after the furnace is opened for about 1 month. This means that in the 1 st month of production, when the furnace bottom contacts the copper liquid, the expansion joint becomes a channel for the copper liquid to permeate into the furnace bottom, and the expansion joint copper permeation has great negative effect on the furnace bottom of the anode furnace:
1. expansion joint copper infiltration condensed extrusion furnace bottom brick
The anode furnace is in an intermittent production mode, and the operation stages of feeding (adding solid copper raw materials), melting (melting the copper raw materials into copper liquid), oxidizing refining, reducing refining and casting are sequentially carried out in each furnace. In most time of each heat, 600-950 mm deep copper liquid is accumulated above the furnace bottom of the anode furnace, and the copper liquid has high specific gravity and very high static pressure; the temperature of the copper liquid is as high as 1200 ℃, and the fluidity is good. Therefore, under the combined action of the temperature and the pressure of the copper liquid, the copper liquid permeates into the expansion joint of the furnace bottom, so that the side surface of the furnace bottom brick is also wrapped by the copper liquid.
After the casting operation of each furnace is finished, the copper liquid in the expansion joint of the furnace bottom brick can be remained, and a small amount of copper liquid can also be remained on the surface of the furnace bottom brick. The production of the next heat is started immediately after the casting operation of the previous heat, the normal-temperature copper raw material is added into the anode furnace, the heat of the furnace bottom is absorbed by the copper raw material in the feeding process, and the temperature of the furnace bottom is sharply reduced from 1200 ℃ to 900 ℃. The residual copper liquid in the expansion joint of the furnace bottom and the residual copper liquid on the surface of the furnace bottom brick are rapidly solidified and shrunk in volume to form the reversed U-shaped cold copper wrapped on the surface of the furnace bottom brick, and the cold copper formed by the copper liquid at the expansion joint extrudes the furnace bottom brick like a clamp from two side surfaces of the furnace bottom brick. No matter the material of the bottom brick is magnesia-chrome brick or magnesia brick, the flexural strength is often less than 1/4 of the compressive strength. The extrusion process continues until the melting phase, in which the copper condensate in the expansion joint melts.
In the charging operation stage of each heat, the copper liquid penetrating into the expansion joint of the furnace bottom can be solidified and extrude the furnace bottom bricks. The total operation time of each heat is 16-30 hours, which means that the furnace bottom bricks are frequently extruded, the loss speed of the furnace bottom bricks is greatly accelerated, and the overhaul period of the anode furnace is shortened (after the furnace bottom bricks are lost 1/3, the anode furnace must be overhauled). When the expansion joint of the furnace bottom is wide, the furnace bottom bricks can be even broken if the molten copper which permeates into the expansion joint of the furnace bottom is rapidly cooled and solidified.
2. The expansion joint copper infiltration causes the stick drawing accident of the bottom brick
In the first month of the open production of the anode furnace, if the copper raw material contains more impurity components with high melting point (most commonly ferroferric oxide), the impurities enter an expansion joint along with the copper liquid to generate a furnace junction with high density, compact structure, stable chemical property and high melting point. When a furnace knot exists, the expansion joint cannot be closed, the copper liquid continuously seeps into the bottom of the furnace through the expansion joint, erodes, permeates and even replaces a ramming material layer below the furnace bottom brick, and finally a copper liquid layer is formed below the furnace bottom brick. Due to the large buoyancy of the copper liquid, the furnace bottom brick can be lifted upwards, which is commonly called as a drawing swab. The furnace bottom brick with the drawing stick protrudes out of the surface of the furnace bottom, and can be quickly smashed and damaged by the added copper raw material, and copper liquid can flow into the furnace bottom from the position to quickly damage the furnace bottom, so that the anode furnace is forced to be overhauled. The furnace bottom brick drawing accident occurs in 1 month of the open production of a plurality of domestic copper enterprises.
Obviously, in order to avoid the negative effect caused by the fact that the bottom expansion joint of the anode furnace is not closed in the initial period of opening the furnace, the furnace drying time is prolonged until all the expansion joints are closed. According to the practice, the oven time needs to be prolonged to be not less than 1 month, however, the oven time is prolonged, the consumption of fuel is greatly increased, and the enterprise cost is difficult to bear. Therefore, how to solve the problem that the furnace bottom of the current anode furnace needs long furnace baking time and high production cost, and the furnace baking time is shortened to cause the copper liquid to permeate into the brick seams of the furnace bottom, the furnace bottom bricks are extruded, the loss of the furnace bottom bricks is aggravated, even the furnace bottom bricks are extruded and broken, and the furnace bottom bricks are drawn and signed, which becomes the problem to be solved urgently in the current industry.
Disclosure of Invention
The invention aims to provide a protective lining composition for the bottom of an anode furnace, aiming at the problems that the expansion joint of the bottom of the anode furnace can not be closed in a short time at the initial stage of open smelting of the anode furnace, and the copper infiltration of the expansion joint is easy to occur at the bottom of the anode furnace, so that the bricks at the bottom of the anode furnace are extruded and damaged or the bricks at the bottom of the anode furnace are drawn, the overhaul period of the anode furnace is greatly shortened, and the production cost of an enterprise is improved.
The invention relates to a furnace bottom protective lining composition of an anode furnace, which consists of the following raw materials in percentage by mass: magnesium-chromium aggregate: 55-65%, magnesium oxide powder: 25-35%, water glass: 12-18%, sodium fluosilicate: 8-12% of the amount of the water glass; the sum of the four raw materials is 100 percent.
The invention discloses a furnace bottom protective lining composition of an anode furnace, which preferably comprises the following raw materials in percentage by mass: magnesium-chromium aggregate: 56-60%, magnesium oxide powder: 26-30%, water glass: 12-16%, sodium fluosilicate: 8-12% of the amount of the water glass; the sum of the four raw materials is 100 percent.
The most preferable formula of the anode furnace bottom protective lining composition is composed of the following raw materials in percentage by mass: magnesium chromium bone powder: 58%, magnesium oxide powder: 28%, water glass: 12.5%, sodium fluorosilicate: 12 percent of the using amount of the water glass.
Preferably, the magnesium-chromium aggregate is prepared by crushing magnesium-chromium bricks until the particle size is less than 10mm, and the particle composition of the magnesium-chromium aggregate is as follows: the magnesium-chromium aggregate with the particle size of 5-10 mm accounts for 50-60%, and the magnesium-chromium aggregate with the particle size of less than 5mm accounts for 40-50%. In order to save the production cost, the recycled used magnesia-chrome bricks can be crushed to prepare the magnesia-chrome aggregate, and the effect is better by adopting new bricks.
Preferably, the magnesia powder is sintered magnesia, wherein the content of magnesia is more than or equal to 90 percent, the grain diameter is less than 1mm, and the grain diameter is more than or equal to 85 percent and less than 0.09 mm.
Preferably, the water glass is industrial liquid sodium silicate, the modulus is 2.3-3.0, and the content of silicon dioxide is more than or equal to 25%.
Preferably, the sodium fluosilicate is industrial sodium fluosilicate, wherein the content of the sodium fluosilicate is more than or equal to 97 percent.
When the furnace bottom protective lining composition is used, after the building of the furnace bottom bricks of the anode furnace is finished, all raw materials of the protective lining composition are weighed according to the proportion, stirred and mixed uniformly, and coated on the surfaces of the furnace bottom bricks of the anode furnace, after the coating is finished, the thickness of a detected coating reaches 20-30 mm, the thickness is qualified, the coating is kept for natural maintenance for three days, namely, a furnace bottom brick protective lining is formed on the furnace bottom bricks of the anode furnace, and then the furnace is dried for 7-8 days according to the normal working procedures, so that the furnace can be opened for use.
The anode furnace bottom brick protective lining composition is composed of magnesium chrome aggregate and magnesium oxide powder serving as main components, water glass serving as a bonding agent and sodium fluosilicate serving as a coagulant, when the anode furnace bottom brick protective lining composition is used, the components are uniformly mixed according to a proportion and coated on the surface of a furnace bottom brick, standing is carried out for natural curing for three days, a protective lining (a fire-resistant protective layer) can be formed on the surface of the furnace bottom brick, the protective lining can bear the impact of 1200 ℃ high temperature of copper water for 2-3 months (a non-permanent protective lining), the effect of separating copper liquid from the furnace bottom brick can be achieved, the copper liquid cannot penetrate into an expansion gap, the anode furnace bottom brick is gradually consumed after the expansion gap between the furnace bottom bricks is completely closed (about one month), the service life of the anode furnace bottom brick can be effectively prolonged, frequent overhaul of an anode furnace is avoided, and the economic benefit is obvious.
The selected magnesium-chromium aggregate has the same components as anode furnace bottom bricks (magnesium-chromium bricks), and after being gradually consumed in the refining process of opening the anode furnace, the magnesium-chromium aggregate becomes scum which floats on the upper surface of the copper liquid due to small self density and is cleaned along with slag skimming operation, so that the quality of the copper liquid cannot be influenced;
the selected magnesium oxide powder has small granularity, can well fill gaps among magnesium-chromium aggregate particles, forms a compact protective layer together with magnesium-chromium aggregate, water glass and the like, can become scum which floats on the upper surface of copper liquid and is cleaned during slag skimming operation along with the slag after being gradually consumed in the process of refining the open-hearth of the anode furnace due to small self density;
the water glass selected in the invention mainly comprises silicon dioxide, and the silicon dioxide is used as a bonding agent in the invention, has good bonding effect on magnesium-chromium aggregate and magnesium oxide, and forms a silicon dioxide net-shaped framework after hardening. The silicon dioxide component is also a slag former commonly used in the copper refining process, a small amount of silicon dioxide stripped from the protective lining can react with impurities in the copper raw material to generate scum with lighter specific gravity which floats on the upper surface of the copper liquid and is cleaned along with the slag skimming operation of the furnace slag;
the sodium fluosilicate selected in the invention is used as a coagulant in the invention, and the sodium fluosilicate forms scum in the using and consuming process and is finally removed as water glass.
The anode furnace bottom protective lining is simple in construction, can be hardened only by natural maintenance and without heating, and is short in maintenance time. The anode furnace can be alternately built with other procedures during building, and the furnace wall can be normally built during maintenance, so that the working time is increased by less than 1 day. The furnace bottom protective lining made of the furnace bottom protective lining composition has the advantages of thin thickness, strong heat conductivity of contained magnesium and chromium components and little loss in the heat transfer process, transfers the heat of an anode furnace molten pool to furnace bottom bricks, enables the furnace bottom bricks to continue to expand without being hindered in the blow-in production, and closes expansion gaps before the furnace bottom protective lining is completely lost.
The invention has simple formula and simple and convenient construction, the manufactured anode furnace bottom protective lining can effectively slow down the mechanical impact of copper liquid on the furnace bottom, prevent the copper liquid and the furnace slag from permeating into the expansion joint of the furnace bottom brick, avoid the physical dissolution and the mechanical scouring of the furnace slag on the furnace bottom brick, stop the occurrence of the accidents of extruding and breaking the furnace bottom brick and drawing the stick of the furnace bottom brick after the copper infiltration condensation of the expansion joint, prolong the service life of the furnace bottom brick and the overhaul period of the anode furnace, and has obvious economic benefit.
Drawings
FIG. 1 is a schematic view showing the structure of the hearth lining composition of the present invention coated on the upper surface of the hearth brick of the anode furnace.
In the figure, 1 is an anode furnace, 2 is a furnace bottom brick, 3 is a protective lining, 4 is molten copper, and 5 is an expansion joint.
Detailed Description
Example 1
The furnace bottom protective lining composition of the anode furnace in the embodiment is composed of the following raw materials in percentage by mass: magnesium chromium bone powder: 58%, magnesium oxide powder: 28%, water glass: 12.5%, sodium fluorosilicate: 1.5 percent.
In this embodiment, the magnesium-chromium aggregate is prepared by crushing magnesium-chromium bricks to a particle size of less than 10mm, and the particle composition of the magnesium-chromium aggregate is as follows: the magnesium-chromium aggregate with the particle size of 5-10 mm accounts for 55%, and the magnesium-chromium aggregate with the particle size of less than 5mm accounts for 45%. In order to save the production cost, the recycled used magnesite-chrome bricks are used to prepare the magnesite-chrome aggregate in the embodiment.
In the embodiment, the magnesia powder is sintered magnesia, wherein the content of magnesia is more than or equal to 90%, the grain size is less than 1mm, and the grain size is more than or equal to 85% and less than 0.09 mm.
In the embodiment, the water glass is industrial liquid sodium silicate, the modulus is 2.3-3.0, and the content of silicon dioxide is more than or equal to 25%.
In the embodiment, the sodium fluosilicate is industrial sodium fluosilicate, wherein the content of the sodium fluosilicate is more than or equal to 97%.
Referring to fig. 1, when the anode furnace bottom protective lining composition of the embodiment is used, after the building of the bottom bricks 2 of the anode furnace 1 is completed, the raw materials of the protective lining composition are weighed according to the proportion, stirred and mixed uniformly, coated on the upper surface of the bottom bricks 2 of the anode furnace, after the coating is completed, the thickness of the detection coating reaches 30mm, the thickness is qualified, the anode furnace bottom protective lining is kept still for natural maintenance for three days, namely, the bottom brick protective lining 3 is formed on the bottom bricks of the anode furnace, and the furnace is dried for 8 days according to the normal procedure, so that the anode furnace bottom protective lining composition can be used after being opened. The furnace bottom brick protective lining manufactured by the embodiment can bear the impact of the high temperature of 1200 ℃ of copper water for 3 months, and can play a role in separating copper liquid 4 from the furnace bottom bricks 2, so that the copper liquid can not permeate into the expansion joints 5, after the furnace bottom bricks 2 of the anode furnace are completely expanded, the expansion joints 5 between the furnace bottom bricks 2 are completely closed after 35 days of normal production, and then are completely consumed after 50 days of normal production, and the furnace bottom bricks 2 are formally contacted with the copper liquid. In the protection process of the protective lining composition, the furnace bottom brick of the anode furnace does not have the accidents of copper infiltration of an expansion joint, extrusion fracture of the furnace bottom brick of the anode furnace or drawing of the furnace bottom brick.
Example 2
The furnace bottom protective lining composition of the anode furnace in the embodiment is composed of the following raw materials in percentage by mass: magnesium-chromium aggregate: 56%, magnesium oxide powder: 30%, water glass: 13%, sodium fluorosilicate: 1 percent.
In this embodiment, the magnesium-chromium aggregate is prepared by crushing magnesium-chromium bricks to a particle size of less than 10mm, and the particle composition of the magnesium-chromium aggregate is as follows: the magnesium-chromium aggregate with the particle size of 5-10 mm accounts for 50%, and the magnesium-chromium aggregate with the particle size of less than 5mm accounts for 50%. The magnesium-chromium aggregate prepared by the new magnesium-chromium brick in the embodiment is not obviously different from the aggregate prepared by the recycled used magnesium-chromium brick through actual production.
In the embodiment, the magnesia powder is sintered magnesia, wherein the content of magnesia is more than or equal to 90%, the grain size is less than 1mm, and the grain size is more than or equal to 85% and less than 0.09 mm.
In the embodiment, the water glass is industrial liquid sodium silicate, the modulus is 2.3-3.0, and the content of silicon dioxide is more than or equal to 25%.
In the embodiment, the sodium fluosilicate is industrial sodium fluosilicate, wherein the content of the sodium fluosilicate is more than or equal to 97%.
The lining protection composition of the embodiment is prepared and then coated on the upper surface of the furnace bottom brick of the anode furnace with the thickness of 20mm, the furnace bottom brick lining is formed after natural curing for 3 days, the furnace is opened for production 7 days after baking, the expansion joint of the furnace bottom brick is completely closed after normal production for 30 days, and the furnace bottom lining is completely consumed after being maintained for 2 months. In the protection process of the protective lining composition, the furnace bottom brick of the anode furnace does not have the accidents of copper infiltration of an expansion joint, extrusion fracture of the furnace bottom brick of the anode furnace or drawing of the furnace bottom brick.
As can be seen from the examples 1 and 2, the furnace bottom protective lining composition can effectively prevent the accidents of extrusion fracture of the furnace bottom bricks of the anode furnace and drawing of the furnace bottom bricks caused by copper infiltration of expansion joints in the production process of opening the anode furnace. The protective lining composition has high practical value, great significance for reducing the production cost and the maintenance cost of the anode furnace and obvious economic benefit.
Example 3
The furnace bottom protective lining composition of the anode furnace in the embodiment is composed of the following raw materials in percentage by mass: magnesium-chromium aggregate: 58.5%, magnesium oxide powder: 26%, water glass: 14%, sodium fluorosilicate: 1.5 percent; the sum of the four raw materials is 100 percent.
In this embodiment, the magnesium-chromium aggregate is prepared by crushing magnesium-chromium bricks to a particle size of less than 10mm, and the particle composition of the magnesium-chromium aggregate is as follows: the magnesium-chromium aggregate with the particle size of 5-10 mm accounts for 60%, and the magnesium-chromium aggregate with the particle size of less than 5mm accounts for 40%. In order to save the production cost, the recycled used magnesite-chrome bricks are crushed to prepare the magnesite-chrome aggregate.
In the embodiment, the magnesia powder is sintered magnesia, wherein the content of magnesia is more than or equal to 90%, the grain size is less than 1mm, and the grain size is more than or equal to 85% and less than 0.09 mm.
In the embodiment, the water glass is industrial liquid sodium silicate, the modulus is 2.3-3.0, and the content of silicon dioxide is more than or equal to 25%.
In the embodiment, the sodium fluosilicate is industrial sodium fluosilicate, wherein the content of the sodium fluosilicate is more than or equal to 97%.
Example 4
The furnace bottom protective lining composition of the anode furnace in the embodiment is composed of the following raw materials in percentage by mass: magnesium-chromium aggregate: 52%, magnesium oxide powder: 35%, water glass: 12%, sodium fluorosilicate: 1 percent.
In this embodiment, the magnesium-chromium aggregate is prepared by crushing magnesium-chromium bricks to a particle size of less than 10mm, and the particle composition of the magnesium-chromium aggregate is as follows: 53 percent of magnesium-chromium aggregate with the particle size of 5-10 mm and 47 percent of magnesium-chromium aggregate with the particle size of less than 5 mm. In order to save the production cost, the recycled used magnesite-chrome bricks are crushed to prepare the magnesite-chrome aggregate.
In the embodiment, the magnesia powder is sintered magnesia, wherein the content of magnesia is more than or equal to 90%, the grain size is less than 1mm, and the grain size of 0.09mm is more than or equal to 85%.
In the embodiment, the water glass is industrial liquid sodium silicate, the modulus is 2.3-3.0, and the content of silicon dioxide is more than or equal to 25%.
In the embodiment, the sodium fluosilicate is industrial sodium fluosilicate, wherein the content of the sodium fluosilicate is more than or equal to 97%.
Example 5
The furnace bottom protective lining composition of the anode furnace in the embodiment is composed of the following raw materials in percentage by mass: magnesium-chromium aggregate: 55%, magnesium oxide powder: 25%, water glass: 18%, sodium fluorosilicate: 2 percent.
In this embodiment, the magnesium-chromium aggregate is prepared by crushing magnesium-chromium bricks to a particle size of less than 10mm, and the particle composition of the magnesium-chromium aggregate is as follows: 57% of magnesium-chromium aggregate with the particle size of 5-10 mm and 43% of magnesium-chromium aggregate with the particle size of less than 5 mm. In order to save the production cost, the recycled used magnesite-chrome bricks are crushed to prepare the magnesite-chrome aggregate.
In the embodiment, the magnesia powder is sintered magnesia, wherein the content of magnesia is more than or equal to 90%, the grain size is less than 1mm, and the grain size is more than or equal to 85% and less than 0.09 mm.
In the embodiment, the water glass is industrial liquid sodium silicate, the modulus is 2.3-3.0, and the content of silicon dioxide is more than or equal to 25%.
In the embodiment, the sodium fluosilicate is industrial sodium fluosilicate, wherein the content of the sodium fluosilicate is more than or equal to 97%.
Example 6
The furnace bottom protective lining composition of the anode furnace in the embodiment is composed of the following raw materials in percentage by mass: magnesium-chromium aggregate: 62%, magnesium oxide powder: 25%, water glass: 12%, sodium fluorosilicate: 1 percent.
In this embodiment, the magnesium-chromium aggregate is prepared by crushing magnesium-chromium bricks to a particle size of less than 10mm, and the particle composition of the magnesium-chromium aggregate is as follows: the magnesium-chromium aggregate with the particle size of 5-10 mm accounts for 52 percent, and the magnesium-chromium aggregate with the particle size of less than 5mm accounts for 48 percent. In order to save the production cost, the recycled used magnesite-chrome bricks are crushed to prepare the magnesite-chrome aggregate.
In the embodiment, the magnesia powder is sintered magnesia, wherein the content of magnesia is more than or equal to 90%, the grain size is less than 1mm, and the grain size is more than or equal to 85% and less than 0.09 mm.
In the embodiment, the water glass is industrial liquid sodium silicate, the modulus is 2.3-3.0, and the content of silicon dioxide is more than or equal to 25%.
In the embodiment, the sodium fluosilicate is industrial sodium fluosilicate, wherein the content of the sodium fluosilicate is more than or equal to 97%.
Claims (7)
1. A method for preventing copper infiltration of an expansion joint of a hearth brick of an anode furnace is characterized by comprising the following steps: the anode furnace bottom protective lining composition comprises the following raw materials in percentage by mass: magnesium-chromium aggregate: 55-65%, magnesium oxide powder: 25-35%, water glass: 12-18%, sodium fluosilicate: 8-12% of the amount of the water glass; the sum of the four raw materials is 100 percent;
when the furnace bottom protective lining composition is used, after the building of the furnace bottom bricks of the anode furnace is completed, all raw materials of the protective lining composition are weighed according to the proportion, stirred and mixed uniformly, and coated on the surfaces of the furnace bottom bricks of the anode furnace, after the coating is completed, the thickness of a detection coating reaches 20-30 mm, the thickness is qualified, the coating is kept for natural maintenance for three days, namely, a furnace bottom brick protective lining is formed on the furnace bottom bricks of the anode furnace, and the furnace is dried for 7-8 days according to the normal working procedures, so that the furnace can be opened for use;
the formed furnace bottom brick protective lining can bear the impact of 1200 ℃ high temperature of copper water for 2-3 months, the effect of separating copper liquid from the furnace bottom bricks is achieved, the copper liquid cannot penetrate into expansion gaps, the protective lining transfers heat of an anode furnace molten pool to the furnace bottom bricks, the furnace bottom bricks continue to expand without being hindered in the blow-in production, and when the furnace bottom bricks of the anode furnace completely expand, the expansion gaps between the furnace bottom bricks are gradually consumed after being completely closed.
2. The method for preventing the copper infiltration of the expansion joint of the bottom bricks of the anode furnace according to the claim 1, which is characterized by comprising the following raw materials by mass percent: magnesium-chromium aggregate: 56-60%, magnesium oxide powder: 26-30%, water glass: 12-16%, sodium fluosilicate: 8-12% of the amount of the water glass; the sum of the four raw materials is 100 percent.
3. The method for preventing the copper infiltration of the expansion joint of the bottom bricks of the anode furnace according to the claim 1 or 2, which is characterized by comprising the following raw materials by weight percentage: magnesium chromium bone powder: 58%, magnesium oxide powder: 28%, water glass: 12.5%, sodium fluorosilicate: 12 percent of the using amount of the water glass.
4. The method for preventing the copper infiltration of the expansion joint of the bottom bricks of the anode furnace according to the claim 1 or 2, characterized in that: the magnesium-chromium aggregate is prepared by crushing magnesium-chromium bricks until the particle size is less than 10mm, and the particle composition of the magnesium-chromium aggregate is as follows: the magnesium-chromium aggregate with the particle size of 5-10 mm accounts for 50-60%, and the magnesium-chromium aggregate with the particle size of less than 5mm accounts for 40-50%.
5. The method for preventing the copper infiltration of the expansion joint of the bottom bricks of the anode furnace according to the claim 1 or 2, characterized in that: the magnesium oxide powder is sintered magnesia, wherein the content of magnesium oxide is more than or equal to 90 percent, the particle size is less than 1mm, and the particle size is more than or equal to 85 percent and less than 0.09 mm.
6. The method for preventing the copper infiltration of the expansion joint of the bottom bricks of the anode furnace according to the claim 1 or 2, characterized in that: the water glass is industrial liquid sodium silicate, the modulus is 2.3-3.0, and the content of silicon dioxide is more than or equal to 25%.
7. The method for preventing the copper infiltration of the expansion joint of the bottom bricks of the anode furnace according to the claim 1 or 2, characterized in that: the sodium fluosilicate is industrial sodium fluosilicate, wherein the content of the sodium fluosilicate is more than or equal to 97 percent.
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| CN115403395B (en) * | 2022-09-01 | 2023-12-01 | 中铜东南铜业有限公司 | Resource utilization method of copper smelting waste magnesium-chromium bricks |
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| SU653234A1 (en) * | 1977-10-31 | 1979-03-25 | Всесоюзный Научно-Исследовательский Институт Автоматизации Черной Металлургии | Protective coating |
| CN1093448C (en) * | 2000-01-15 | 2002-10-30 | 浙江湖州红鹰企业集团有限公司 | Magnesium paint for tundish in conticasting |
| CN1152840C (en) * | 2002-01-10 | 2004-06-09 | 武汉钢铁(集团)公司 | Stirred magnesia-water mixture for repairing furnace lining and its usage |
| CN101342572A (en) * | 2008-08-22 | 2009-01-14 | 宜兴鑫达耐火材料有限公司 | MgO-Cr2O3 paint |
| CN201344729Y (en) * | 2009-01-20 | 2009-11-11 | 武汉钢铁集团精鼎工业炉有限责任公司 | Repaired structure for working lining at middle part of vertical vacuum refining furnace |
| CN101550016B (en) * | 2009-04-28 | 2011-08-03 | 莱芜钢铁集团有限公司 | Magnesia chrome carbon coating and preparation method thereof |
| CN102372487B (en) * | 2010-08-25 | 2013-04-24 | 宝山钢铁股份有限公司 | Magnesium-carbon gunning mix |
| CN102040389A (en) * | 2010-11-08 | 2011-05-04 | 郑州安耐克实业有限公司 | Preparation method and proportion of components of low-carbon magnesium-calcium carbon brick for manufacturing inner lining of steel-making refining furnace |
| CN102391003B (en) * | 2011-08-05 | 2013-09-04 | 海城市中兴镁质合成材料有限公司 | MgO-Cr2O3 ramming material for VOD (Vacuum Oxygen Decarburization) steel ladle safety liner |
| CN102584290A (en) * | 2012-02-17 | 2012-07-18 | 重庆重冶铜业有限公司 | Filling material for furnace bottom of copper refining furnace and filling method thereof |
| CN102795866A (en) * | 2012-07-26 | 2012-11-28 | 大冶有色金属有限责任公司 | Ramming mass special for hearth of copper refining reverberatory furnace |
| CN102964137A (en) * | 2012-12-04 | 2013-03-13 | 武汉钢铁(集团)公司 | Low-silicon regeneration magnesium-chrome ramming material for RH refining furnace and preparation method thereof |
| CN105152662B (en) * | 2015-09-25 | 2017-09-29 | 攀枝花钢城集团有限公司 | Medium frequency induction furnace body dry type ramming material |
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