CN113526944A - Anti-sticking copper spray coating and preparation method thereof - Google Patents
Anti-sticking copper spray coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an anti-sticking copper spray coating and a preparation method thereof. An anti-sticking copper spray coating comprises the following components: 40-60 parts of sintered magnesia powder, 10-25 parts of waste magnesia carbon brick powder, 5-15 parts of bentonite, 5-16 parts of chromium ore powder, 5-16 parts of graphite and 3.1-12.5 parts of a bonding agent. The method comprises the following steps: a. taking raw materials: 40-60 parts of sintered magnesia powder, 10-25 parts of waste magnesia carbon brick powder, 5-15 parts of bentonite, 5-16 parts of chromium ore powder, 5-16 parts of graphite and 3.1-12.5 parts of a binding agent, and then uniformly stirring the raw materials and bagging; b. when in use, the raw materials and water are uniformly mixed according to the mass ratio of 1:1 to obtain the anti-sticking copper spray coating. According to the technical scheme, the damage to the refractory material of the masonry layer caused by mechanical dismantling is avoided, meanwhile, frequent repair by using repair materials is avoided, the use and maintenance cost is reduced, energy conservation and consumption reduction are facilitated, and the labor intensity is also reduced.
Description
Technical Field
The invention belongs to the technical field of general spray coatings, and particularly relates to an anti-sticking copper spray coating and a preparation method thereof.
Background
The copper smelting anode furnace chute, the tundish and the casting ladle are intermittent operation equipment, the parts of the copper smelting anode furnace chute, the tundish and the casting ladle which are contacted with the copper liquid with the temperature of 1150-plus-one 1170 ℃ are all refractory brick material layers, most of the materials are aluminum-carbon materials, and the thermal expansion coefficient is 4.5-6.0 multiplied by 10-6V. C, the rest is a small part of high-alumina material masonry layer, clay material masonry layer and high-alumina materialThe thermal expansion coefficient of the material masonry layer is 5.5-5.8 multiplied by 10-6/° c, the coefficient of thermal expansion of the clayey material masonry 4.5-5.5 x 10-6When the hot metal copper liquid of the anode furnace flows through the masonry layers of the chute, the tundish and the casting ladle in a large amount, the viscosity of the copper liquid is low, the fluidity is good, when the anode furnace stops putting copper, part of the copper liquid is bonded on the masonry layers of the chute, the tundish and the casting ladle due to the gradual temperature reduction and cooling, and the cooled copper is firmly bonded on the masonry layers, so that the chute is blocked or the effective capacity of the tundish and the casting ladle is reduced, therefore, a worker is often required to pry and carry out a violent mechanical dismantling method such as pulling, smashing and the like, although the method can remove the cooled and bonded copper, the method can also cause local or overall damage to the refractory material masonry layers of the chute, the tundish and the casting ladle, so that the surface of the refractory material masonry layers of the chute, the tundish and the casting ladle is frequently repaired, and a large amount of refractory material resources are wasted, meanwhile, the labor intensity is high, and the required time is long.
In order to improve the above situation, the current treatment methods mainly include the following methods: 1. the masonry layer is prepared by materials which are difficult to be infiltrated by copper liquid, such as silicon carbide and the like, so that the infiltration of the copper liquid into the masonry layer is reduced, and the associated damage to the masonry layer is reduced during mechanical dismantling; 2. promote chute, tundish, ladle casting ladle's masonry refractory material intensity, alleviate the destruction degree of violence demolishment to the masonry, from the practice, the cost is higher, and still have the serious problem of masonry destruction.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention firstly provides an anti-sticking copper spray coating and secondly provides a preparation method of the anti-sticking copper spray coating.
An anti-sticking copper spray coating comprises the following components: 40-60 parts of sintered magnesia powder, 10-25 parts of waste magnesia carbon brick powder, 5-15 parts of bentonite, 5-16 parts of chromium ore powder, 5-16 parts of graphite and 3.1-12.5 parts of a bonding agent.
Furthermore, the granularity of the sintered magnesia powder is below 325 meshes; the granularity of the waste magnesia carbon brick powder is below 180 meshes; the particle size of the bentonite is below 200 meshes; the granularity of the chromium ore powder is below 200 meshes; the particle size of the graphite is below 180 meshes.
Furthermore, in the sintered magnesia powder, the mass fraction of MgO is more than 90%.
Furthermore, in the waste magnesia carbon brick powder, the mass fraction of MgO is 70-90%, the mass fraction of C is 5-15%, the balance is mainly a binding agent, and an antioxidant and the like can be added, generally, the binding agent is asphalt, coal tar and the like, and the antioxidant can be BN, SiC and the like.
Furthermore, the plastic viscosity of the bentonite is more than or equal to 2.8 Pa.S, the colloid value is more than or equal to 90ml/15g of soil, the pH value is 8-10.5, the water content is less than or equal to 10%, and the expansion multiple is more than or equal to 20 ml/g.
The method for measuring the plastic viscosity of the bentonite is determined according to the method in GB/T5005-2010, and the specific scheme is as follows: 22.5g of bentonite is added into 350ml of deionized water, a 11000r/min stirrer is used for stirring and slurrying for 20min, the mixture is maintained for 16h at the constant temperature of 25 +/-1 ℃, the mixture is stirred for 5min, then a six-speed rotary viscometer is used for measuring the viscosity at 600r/min and 300r/min at the temperature of 25 +/-1 ℃, and the plastic viscosity is the difference between the viscosity at 600r/min and the viscosity at 300 r/min.
The method for measuring the colloid value of the bentonite comprises the steps of adding 15.00g of the bentonite into a 100ml measuring cylinder with a plug and containing 50-60ml of water, adding water to 90ml, tightly covering the plug, shaking for 5 minutes to fully disperse a sample, opening the plug, adding 1.00g of magnesium oxide, adding water to 100ml, tightly covering the plug, shaking for 3 minutes, placing the measuring cylinder on a table top which is not subjected to vibration, standing for 24 hours, and reading the scale value of a colloid interface to obtain the colloid value.
The pH of bentonite is measured by placing 2.00g of bentonite in a small beaker, adding 20ml of distilled water, stirring for 3min to disperse the sample, inserting the electrode of an acidimeter into the suspension, standing for 1min, and reading the pH value.
The swelling multiple determination method of bentonite comprises the steps of adding 1.00g of bentonite into a 100ml measuring cylinder with a plug and containing 30-40ml of water, adding water to 75ml of scale positions, tightly covering the plug and shaking for 3min, opening the plug, adding 25ml of hydrochloric acid solution, covering the plug and shaking for 1min, placing the measuring cylinder on a table top which is not subjected to vibration, standing for 24h, reading out the scale value of a precipitate interface, namely the swelling multiple, and diluting 1mol/L hydrochloric acid with 83ml of hydrochloric acid solution to 1000ml to obtain the hydrochloric acid solution.
Further, in the chromium ore powder, Cr2O3The mass fraction is more than 50%.
Furthermore, the mass fraction of the fixed carbon in the graphite is more than 86%.
Further, the binding agent is a mixture of a main binding agent and an auxiliary binding agent, the weight part of the main binding agent is higher than that of the auxiliary binding agent, the main binding agent is sodium tripolyphosphate or sodium hexametaphosphate or a mixture of the sodium tripolyphosphate and the sodium hexametaphosphate, and the auxiliary binding agent is a mixture of white dextrin and carboxymethyl cellulose. Wherein, the white dextrin, the carboxymethyl cellulose, the sodium tripolyphosphate and the sodium hexametaphosphate are all common powder.
Furthermore, in the carboxymethyl cellulose, the content of the sodium carboxymethyl cellulose is more than or equal to 99.5 percent, and the carbonization temperature is 235-248 ℃.
Furthermore, the sodium tripolyphosphate is sodium tripolyphosphate which meets the requirements of a secondary product or more than the secondary product specified in GB 9983-2004.
The preparation method of the anti-sticking copper spray coating comprises the following steps: a. taking raw materials: 40-60 parts of sintered magnesia powder, 10-25 parts of waste magnesia carbon brick powder, 5-15 parts of bentonite, 5-16 parts of chromium ore powder, 5-16 parts of graphite and 3.1-12.5 parts of a binding agent, and then uniformly stirring the raw materials and bagging; b. when the anti-sticking copper spray coating is used, the raw materials bagged in the step a and water are uniformly mixed according to the mass ratio of 1:1 to obtain the anti-sticking copper spray coating. When the chute, the tundish and the casting ladle are taken off line, the coating can be sprayed or brushed at the temperature of 25-1000 ℃, the thickness of the coating is 1mm-2mm, the curing time is 2-24 hours at the temperature of 25-150 ℃, and the curing time is 0.5-2 hours at the temperature of 150-1000 ℃. In the technical scheme, sodium tripolyphosphate and sodium hexametaphosphate are used, and orthophosphate binders such as aluminum dihydrogen phosphate are avoided, so that enough construction time is reserved for brushing or spray repair, and the problem that the good and correct structure is difficult to form due to the fact that the orthophosphates such as aluminum dihydrogen phosphate and the like react with MgO in water too quickly is avoided.
Further, in step a, the raw materials are stirred in a double-screw mixer for 6 to 8 minutes and then bagged.
The finally obtained anti-sticking copper spray coating is determined according to the methods in GB/T16555-2017 and GB/T21114-2019, and MgO + C is more than or equal to 60 percent; cr measured according to GB/T5070-20152O3Not less than 2.5 percent; the linear change rate after burning is determined to be + 1% to-5% according to GB/T22459.7-2008; the normal-temperature rupture-resistant bonding strength is determined according to GB/T22459.4-2008, and the drying temperature is 110 ℃, and the temperature is kept for 24 hours, and the pressure is not less than 2 MPa; measuring the high-temperature rupture-resistant bonding strength according to GB/T22459.7-2008, wherein the sintering temperature is 1350 ℃, and the temperature is kept for 3 hours at 6.0-10 MPa; the thermal expansion coefficient is 9.3-13.0 × 10 determined according to GB/T7320-2018-6/℃。
Compared with the prior art, the invention has the following beneficial effects: by arranging the spraying layer with the expansion coefficient different from that of the masonry layer on the masonry layer, the method not only can ensure that the masonry layer is not damaged greatly when the spraying layer is contacted with hot copper liquid, but also can prevent the copper liquid from being cooled and bonded on the masonry layer when the hot copper liquid is contacted with the spraying layer, the masonry layer and the spraying layer begin to expand thermally and the spraying layer begins to slightly separate from the masonry layer, and the spraying layer and the masonry layer also begin to slightly separate when the copper liquid is cooled, because the spraying layer and the masonry layer have different contraction degrees and different expansion stresses, and the spraying layer also adheres cold copper, and the cold copper is generally and unevenly distributed, so that the contraction degrees of the spraying layers at different parts are different, and in addition, the cold copper also gives load to the spraying layer, so that the spraying layer together with the cooled copper finally falls off, the damage to the refractory material of the masonry layer caused by mechanical dismantling is avoided, meanwhile, frequent repairing by using a repairing material is avoided, and the use and maintenance cost is reduced, is beneficial to energy conservation and consumption reduction, and also lightens the labor intensity.
Detailed Description
The present invention will be further explained with reference to specific examples. The following examples are merely illustrative of the present invention, and are not intended to limit the present invention, and all the technical solutions obtained by simple replacement and superposition based on the present invention shall fall within the protection scope of the present invention.
Example 1
An anti-sticking copper spray coating comprises the following components: 40 parts of sintered magnesia powder, 25 parts of waste magnesia carbon brick powder, 5 parts of bentonite, 16 parts of chromium ore powder, 5 parts of graphite and 3.1 parts of a bonding agent, wherein the main bonding agent is 1.6 parts by weight, the main bonding agent is 0.8 part by weight of sodium tripolyphosphate, the sodium hexametaphosphate is 0.8 part by weight, the auxiliary bonding agent is 1.5 parts by weight, and the auxiliary bonding agent is 0.7 part by weight of white dextrin and 0.8 part by weight of carboxymethyl cellulose.
Further, the granularity of the sintered magnesia powder is 325 meshes; the granularity of the waste magnesia carbon brick powder is 180 meshes; the granularity of the bentonite is 200 meshes; the granularity of the chromium ore powder is 200 meshes; the particle size of the graphite is 180 meshes.
Furthermore, in the sintered magnesia powder, the mass fraction of MgO is 90%.
Furthermore, in the waste magnesia carbon brick powder, the mass fraction of MgO is 70%, the mass fraction of C is 15%, and the balance is mainly a bonding agent which can be asphalt, coal tar or the like.
Furthermore, the plastic viscosity of the bentonite is 6 Pa.S, the colloid value is 99ml/15g of soil, the pH value is 10.5, the water content is 10 percent, and the expansion multiple is 40 ml/g. The bentonite used is sodium bentonite.
Further, in the chromium ore powder, Cr2O3The mass fraction is 50%.
Further, the graphite contains 86% by mass of fixed carbon.
Furthermore, in the carboxymethyl cellulose, the content of the sodium carboxymethyl cellulose is 99.5 percent, and the carbonization temperature is 235-248 ℃.
The preparation method of the anti-sticking copper spray coating comprises the following steps: a. taking raw materials: 40 parts of sintered magnesia powder, 25 parts of waste magnesia carbon brick powder, 5 parts of bentonite, 16 parts of chromium ore powder, 5 parts of graphite, 0.7 part of white dextrin, 0.8 part of carboxymethyl cellulose, 0.8 part of sodium tripolyphosphate and 0.8 part of sodium hexametaphosphate, and then the raw materials are uniformly stirred and bagged; b. when in use, the raw materials and water are uniformly mixed according to the mass ratio of 1:1 to obtain the anti-sticking copper spray coating.
Further, in step a, the raw materials were stirred in a twin-screw mixer for 6 minutes and then bagged.
Measured according to the methods in GB/T16555 and GB/T21114, MgO + C is more than or equal to 60 percent; cr measured according to GB/T50702O3Not less than 2.5 percent; determining the linear change rate after firing to be + 1% according to GB/T22459.7-2008; measuring the normal-temperature flexural strength according to GB/T22459.4, wherein the drying temperature is 110 ℃, and the heat preservation time is 24 hours, and the drying temperature is 2 MPa; measuring the high-temperature rupture bond strength according to GB/T22459.7, wherein the sintering temperature is 1350 ℃ and the temperature is 6.0MPa when the temperature is kept for 3 hours; a coefficient of thermal expansion of 9.3X 10, determined according to GB/T7320-6/℃。
Example 2
An anti-sticking copper spray coating comprises the following components: 60 parts of sintered magnesia powder, 10 parts of waste magnesia carbon brick powder, 15 parts of bentonite, 5 parts of chromium ore powder, 16 parts of graphite and 12.5 parts of a bonding agent, wherein in the bonding agent, 10 parts of a main bonding agent, 8 parts of sodium tripolyphosphate, 2 parts of sodium hexametaphosphate, 2.5 parts of an auxiliary bonding agent, 1 part of white dextrin and 1.5 parts of carboxymethyl cellulose are used.
Further, the granularity of the sintered magnesia powder is 400 meshes; the granularity of the waste magnesia carbon brick powder is 200 meshes; the granularity of the bentonite is 270 meshes; the granularity of the chromium ore powder is 270 meshes; the particle size of the graphite is 200 meshes.
Furthermore, in the sintered magnesia powder, the mass fraction of MgO is 95%.
Furthermore, in the waste magnesia carbon brick powder, the mass fraction of MgO is 90%, the mass fraction of C is 5%, and the balance is mainly a bonding agent.
Furthermore, the plastic viscosity of the bentonite is 2.8 Pa.S, the colloid value is 90ml/15g of soil, the pH value is 8, the water content is 5 percent, and the expansion multiple is 20 ml/g. The bentonite used is calcium bentonite.
Further, in the chromium ore powder, Cr2O3The mass fraction is 62%.
Further, the graphite has a mass fraction of fixed carbon of 94%.
Furthermore, in the carboxymethyl cellulose, the content of the sodium carboxymethyl cellulose is 99.7 percent, and the carbonization temperature is 235-248 ℃.
The preparation method of the anti-sticking copper spray coating comprises the following steps: a. taking raw materials: 60 parts of sintered magnesia powder, 10 parts of waste magnesia carbon brick powder, 15 parts of bentonite, 5 parts of chromium ore powder, 16 parts of graphite, 1 part of white dextrin, 1.5 parts of carboxymethyl cellulose, 8 parts of sodium tripolyphosphate and 2 parts of sodium hexametaphosphate, and then uniformly stirring the raw materials and bagging; b. when in use, the raw materials and water are uniformly mixed according to the mass ratio of 1:1 to obtain the anti-sticking copper spray coating.
Further, in step a, the raw materials were stirred in a twin-screw mixer for 8 minutes and then bagged.
Measured according to the methods in GB/T16555 and GB/T21114, MgO + C is more than or equal to 60 percent; cr measured according to GB/T50702O3Not less than 2.5 percent; determining the linear change rate after burning to be-5% according to GB/T22459.7-2008; measuring the normal-temperature flexural strength according to GB/T22459.4, wherein the drying temperature is 110 ℃, and the heat preservation time is 24 hours, and the drying temperature is 3 MPa; measuring the high-temperature rupture-resistant bonding strength according to GB/T22459.7, wherein the sintering temperature is 1350 ℃, and the temperature is 10MPa when the temperature is kept for 3 hours; a coefficient of thermal expansion of 13.0X 10 as determined according to GB/T7320-6/℃。
Example 3
An anti-sticking copper spray coating comprises the following components: 50 parts of sintered magnesia powder, 15 parts of waste magnesia carbon brick powder, 10 parts of bentonite, 10 parts of chromium ore powder, 10 parts of graphite and 8.1 parts of a bonding agent, wherein 7 parts of a main bonding agent, 1 part of sodium tripolyphosphate, 6 parts of sodium hexametaphosphate, 1.1 parts of an auxiliary bonding agent, 1 part of white dextrin and 0.1 part of carboxymethyl cellulose are contained in the bonding agent.
Further, the granularity of the sintered magnesia powder is 325 meshes; the granularity of the waste magnesia carbon brick powder is 180 meshes; the granularity of the bentonite is 200 meshes; the granularity of the chromium ore powder is 200 meshes; the particle size of the graphite is 180 meshes.
Furthermore, in the sintered magnesia powder, the mass fraction of MgO is 93%.
Furthermore, in the waste magnesia carbon brick powder, the mass fraction of MgO is 80%, the mass fraction of C is 10%, and the balance is mainly a bonding agent.
Furthermore, the bentonite has the plastic viscosity of 4Pa & S, the colloid value of 96ml/15g soil, the pH value of 9.8, the water content of 8 percent and the expansion multiple of 30 ml/g. The bentonite used is lithium bentonite.
Further, in the chromium ore powder, Cr2O3The mass fraction is 80%.
Further, the mass fraction of fixed carbon in the graphite is 99.9%.
Furthermore, the content of the sodium carboxymethyl cellulose in the carboxymethyl cellulose is 99.5 percent, and the carbonization temperature is 235-248 ℃.
The preparation method of the anti-sticking copper spray coating comprises the following steps: a. taking raw materials: 50 parts of sintered magnesia powder, 15 parts of waste magnesia carbon brick powder, 10 parts of bentonite, 10 parts of chromium ore powder, 10 parts of graphite, 1 part of white dextrin, 0.1 part of carboxymethyl cellulose, 1 part of sodium tripolyphosphate and 6 parts of sodium hexametaphosphate, and then uniformly stirring the raw materials and bagging; b. when in use, the raw materials and water are uniformly mixed according to the mass ratio of 1:1 to obtain the anti-sticking copper spray coating.
Further, in step a, the raw materials were stirred in a twin-screw mixer for 7 minutes and then bagged.
Measured according to the methods in GB/T16555 and GB/T21114, MgO + C is more than or equal to 60 percent; cr measured according to GB/T50702O3Not less than 2.5 percent; determining the linear change rate after burning to be-3% according to GB/T22459.7-2008; the normal-temperature rupture bond strength is measured according to GB/T22459.4, and the rupture bond strength is 2.8MPa when the drying temperature is 110 ℃ and the heat preservation is carried out for 24 hours; measuring the high-temperature rupture bond strength according to GB/T22459.7, wherein the sintering temperature is 1350 ℃ and the temperature is 9.1MPa when the temperature is kept for 3 hours; a coefficient of thermal expansion of 12.2X 10 as determined according to GB/T7320-6/℃。
Example 4
An anti-sticking copper spray coating comprises the following components: 40 parts of sintered magnesia powder, 25 parts of waste magnesia carbon brick powder, 5 parts of bentonite, 16 parts of chromium ore powder, 5 parts of graphite and 6.4 parts of a bonding agent, wherein the bonding agent comprises 4.4 parts of a main bonding agent, 2 parts of an auxiliary bonding agent, 1.5 parts of white dextrin and 0.5 part of carboxymethyl cellulose.
Further, the granularity of the sintered magnesia powder is 325 meshes; the granularity of the waste magnesia carbon brick powder is 180 meshes; the granularity of the bentonite is 200 meshes; the granularity of the chromium ore powder is 200 meshes; the particle size of the graphite is 180 meshes.
Furthermore, in the sintered magnesia powder, the mass fraction of MgO is 90%.
Furthermore, in the waste magnesia carbon brick powder, the mass fraction of MgO is 70%, the mass fraction of C is 15%, and the balance is mainly a bonding agent which can be asphalt, coal tar or the like.
Furthermore, the plastic viscosity of the bentonite is 6 Pa.S, the colloid value is 99ml/15g of soil, the pH value is 10.5, the water content is 10 percent, and the expansion multiple is 40 ml/g. The bentonite used is sodium bentonite.
Further, in the chromium ore powder, Cr2O3The mass fraction is 50%.
Further, the graphite contains 86% by mass of fixed carbon.
Furthermore, in the carboxymethyl cellulose, the content of the sodium carboxymethyl cellulose is 99.5 percent, and the carbonization temperature is 235-248 ℃.
The preparation method of the anti-sticking copper spray coating comprises the following steps: a. taking raw materials: 40 parts of sintered magnesia powder, 25 parts of waste magnesia carbon brick powder, 5 parts of bentonite, 16 parts of chromium ore powder, 5 parts of graphite, 1.5 parts of white dextrin, 0.5 part of carboxymethyl cellulose and 4.4 parts of sodium tripolyphosphate, and then the raw materials are uniformly stirred and bagged; b. when in use, the raw materials and water are uniformly mixed according to the mass ratio of 1:1 to obtain the anti-sticking copper spray coating.
Further, in step a, the raw materials were stirred in a twin-screw mixer for 6 minutes and then bagged.
Measured according to the methods in GB/T16555 and GB/T21114MgO + C is more than or equal to 60 percent; cr measured according to GB/T50702O3Not less than 2.5 percent; determining the linear change rate after burning to be-1% according to GB/T22459.7-2008; the normal-temperature rupture bond strength is measured according to GB/T22459.4, and the rupture bond strength is 2.2MPa when the drying temperature is 110 ℃ and the heat preservation is carried out for 24 hours; measuring the high-temperature rupture bond strength according to GB/T22459.7, wherein the sintering temperature is 1350 ℃, and the sintering temperature is 8.3MPa when the temperature is kept for 3 hours; a coefficient of thermal expansion of 10.1X 10 as determined according to GB/T7320-6/℃。
Example 5
An anti-sticking copper spray coating comprises the following components: 40 parts of sintered magnesia powder, 25 parts of waste magnesia carbon brick powder, 5 parts of bentonite, 16 parts of chromium ore powder, 5 parts of graphite and 5.2 parts of a bonding agent, wherein the bonding agent comprises 3.9 parts of a main bonding agent, 1.3 parts of an auxiliary bonding agent, 1 part of white dextrin and 0.3 part of carboxymethyl cellulose.
Further, the granularity of the sintered magnesia powder is 325 meshes; the granularity of the waste magnesia carbon brick powder is 180 meshes; the granularity of the bentonite is 200 meshes; the granularity of the chromium ore powder is 200 meshes; the particle size of the graphite is 180 meshes.
Furthermore, in the sintered magnesia powder, the mass fraction of MgO is 90%.
Furthermore, in the waste magnesia carbon brick powder, the mass fraction of MgO is 70%, the mass fraction of C is 15%, and the balance is mainly a bonding agent which can be asphalt, coal tar or the like.
Furthermore, the plastic viscosity of the bentonite is 6 Pa.S, the colloid value is 99ml/15g of soil, the pH value is 10.5, the water content is 10 percent, and the expansion multiple is 40 ml/g. The bentonite used is sodium bentonite.
Further, in the chromium ore powder, Cr2O3The mass fraction is 50%.
Further, the graphite contains 86% by mass of fixed carbon.
Furthermore, in the carboxymethyl cellulose, the content of the sodium carboxymethyl cellulose is 99.5 percent, and the carbonization temperature is 235-248 ℃.
The preparation method of the anti-sticking copper spray coating comprises the following steps: a. taking raw materials: 40 parts of sintered magnesia powder, 25 parts of waste magnesia carbon brick powder, 5 parts of bentonite, 16 parts of chromium ore powder, 5 parts of graphite, 1 part of white dextrin, 0.3 part of carboxymethyl cellulose and 3.9 parts of sodium hexametaphosphate, and then the raw materials are uniformly stirred and bagged; b. when in use, the raw materials and water are uniformly mixed according to the mass ratio of 1:1 to obtain the anti-sticking copper spray coating.
Further, in step a, the raw materials were stirred in a twin-screw mixer for 6 minutes and then bagged.
Measured according to the methods in GB/T16555 and GB/T21114, MgO + C is more than or equal to 60 percent; cr measured according to GB/T50702O3Not less than 2.5 percent; determining the linear change rate after burning to be-1% according to GB/T22459.7-2008; the normal temperature rupture bond strength is measured according to GB/T22459.4, the drying temperature is 110 ℃, and the heat preservation time is 24 hours, the pressure is 2.1 MPa; measuring the high-temperature rupture bond strength according to GB/T22459.7, wherein the sintering temperature is 1350 ℃ and the temperature is 7.6MPa when the temperature is kept for 3 h; a coefficient of thermal expansion of 9.8X 10, determined according to GB/T7320-6/℃。
The parts by weight of each component in examples 1 to 5 are shown in Table 1.
According to the prior art, the masonry layer is generally a prefabricated member and is mostly aluminum carbon. In practical use, a certain anode plate pouring system comprises 1 set of tundish and 2 sets of pouring ladles, the used masonry layers are all made of more widely used aluminum silicon carbide prefabricated parts, statistical calculation shows that the aluminum silicon carbide prefabricated parts need to be replaced once in 1 week, the aluminum silicon carbide prefabricated parts of the tundish are 69672 yuan/set, the aluminum silicon carbide prefabricated parts of the pouring ladles are 65328 yuan/2 set, after the spraying materials prepared in the embodiments are used, 200kg is sprayed every day, the cost is about 3500 yuan/ton, and the service cycle of the masonry layers reaches 4 weeks.
When 4 weeks is taken as 1 using period, according to the prior art, 1 using period is finished, the cost of the refractory material is (69672+65328) × 4 ═ 540000 yuan, and after the technical scheme is used, the cost of the refractory material for 1 period is (69672+65328) + (200 × 7)/1000 × 4 × 3500 ═ 154600 yuan. Therefore, in 1 production cycle, the technical scheme can save 385400 yuan, namely about 70% of cost, is beneficial to energy conservation and emission reduction, is also beneficial to energy conservation and consumption reduction, and can greatly reduce the labor amount of workers for replacing the masonry layer prefabricated member in the cycle.
Claims (10)
1. An anti-sticking copper spray coating is characterized in that: the components comprise: 40-60 parts of sintered magnesia powder, 10-25 parts of waste magnesia carbon brick powder, 5-15 parts of bentonite, 5-16 parts of chromium ore powder, 5-16 parts of graphite and 3.1-12.5 parts of a bonding agent.
2. The spray coating of anti-adhesion copper as defined in claim 1, wherein: the granularity of the sintered magnesia powder is below 325 meshes; the granularity of the waste magnesia carbon brick powder is below 180 meshes; the particle size of the bentonite is below 200 meshes; the granularity of the chromium ore powder is below 200 meshes; the particle size of the graphite is below 180 meshes.
3. The spray coating of anti-adhesion copper as defined in claim 1, wherein: in the sintered magnesia powder, the mass fraction of MgO is more than 90%.
4. The spray coating of anti-adhesion copper as defined in claim 1, wherein: in the waste magnesia carbon brick powder, the mass fraction of MgO is 70-90%, the mass fraction of C is 5-15%, and the balance is mainly a bonding agent.
5. The spray coating of anti-adhesion copper as defined in claim 1, wherein: the plastic viscosity of the bentonite is more than or equal to 2.8 Pa.S, the colloid value is more than or equal to 90ml/15g of soil, the pH value is 8-10.5, the water content is less than or equal to 10%, and the expansion multiple is more than or equal to 20 ml/g.
6. The spray coating of anti-adhesion copper as defined in claim 1, wherein: in the chromium ore powder, Cr2O3The mass fraction is more than 50%.
7. The spray coating of anti-adhesion copper as defined in claim 1, wherein: the mass fraction of the fixed carbon in the graphite is more than 86%.
8. The spray coating of anti-adhesion copper as defined in claim 1, wherein: the binding agent is the mixture of a main binding agent and an auxiliary binding agent, the weight part of the main binding agent is higher than that of the auxiliary binding agent, the main binding agent is sodium tripolyphosphate or sodium hexametaphosphate or the mixture of the sodium tripolyphosphate and the sodium hexametaphosphate, and the auxiliary binding agent is the mixture of white dextrin and carboxymethyl cellulose.
9. A process for the preparation of the anti-stick copper spray coating according to any one of claims 1 to 8, characterized in that: the method comprises the following steps: a. taking raw materials: 40-60 parts of sintered magnesia powder, 10-25 parts of waste magnesia carbon brick powder, 5-15 parts of bentonite, 5-16 parts of chromium ore powder, 5-16 parts of graphite and 3.1-12.5 parts of a binding agent, and then uniformly stirring the raw materials and bagging; b. when in use, the raw materials and water are uniformly mixed according to the mass ratio of 1:1 to obtain the anti-sticking copper spray coating.
10. The method of claim 9 for preparing a copper stick resistant spray paint, wherein: in the step a, the raw materials are stirred in a double helix mixer for 6-8 minutes and then bagged.
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