A furnace lining for preparing rock wool from fly ash resources and its application

Abstract

The present invention provides a furnace lining for preparing rock wool from fly ash resources and its application, and relates to the technical field of high-temperature resource utilization of fly ash. The furnace lining for preparing rock wool from fly ash resources includes a furnace inner wall lining; the furnace inner wall lining includes, from top to bottom, an upper inner wall lining, a middle inner wall lining and a lower inner wall lining, and the furnace inner wall lining is cast with chromium-containing corundum casting material. The furnace lining for preparing rock wool from fly ash resources of the present invention is provided with a high-chromium corundum composite lining with different contents of Cr2O3 and Al2O3 according to the characteristics of fly ash and the characteristics of different temperature zones in the furnace, thereby significantly improving the anti-fly ash erosion performance of the refractory material, and significantly extending the service life of the furnace body; and by adding a certain amount of Fe2O3 and CaO, the flexibility of the refractory lining is increased; further protection is formed for the furnace bottom and the furnace wall, and corrosion of the furnace wall by molten iron can also be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature fly ash resource utilization, and in particular to a furnace lining for preparing rock wool from fly ash resources and an application thereof. Background Art

[0002] Industries such as waste incineration power generation and hazardous waste incineration disposal generate a large amount of incineration residues and fly ash, which contain a large amount of pollutants such as dust, heavy metals, and dioxins. Currently, many companies are recycling incineration slag / fly ash through resource treatment. The resource treatment process generally uses a high-temperature melting furnace.

[0003] The combustion zone of a high-temperature melting furnace is generally higher than 600°C. During actual operation, the furnace temperature of a high-temperature melting furnace will be much higher than the design temperature. During the incineration of garbage, a large amount of fly ash can easily adhere to the refractory lining surfaces such as the front and rear arches and side walls of the incinerator. The higher the temperature, the lower the viscosity of the slag, and the more intense the reaction with the refractory material. After the reaction erosion, an ash adhesion layer with high bonding strength is formed, which increases the load on the furnace lining, especially the side walls of the front and rear arches. The excessive load can easily cause deformation of the steel structure and collapse of the lining, which in turn affects the recovery rate of the fly ash and causes reaction erosion of the inner wall of the furnace. Therefore, the high-temperature melting furnace is often shut down for cleaning due to severe fly ash adhesion, which seriously affects the operating efficiency and inevitably shortens the service life of the melting furnace.

[0004] CN109942287A discloses an anti-ash adhesion wear-resistant castable for a waste incinerator, the castable comprising: corundum, silicon carbide, aluminum oxide, silicon dioxide, additives, binders, and admixtures. The wear-resistant castable has certain wear resistance and anti-ash adhesion, but its application scenario is a waste incinerator; it is not suitable for a high-temperature melting furnace in the process of resource recovery; and the composition ratio of the front and rear arches, the inclined roof, and the upper part of the side wall of the adhesion wear-resistant castable in the furnace are the same, but the high-temperature melting furnace has different temperature partitions in the furnace, and the same material composition ratio is used, which has limited improvement on the anti-fly ash erosion performance of the refractory material and also leads to waste of resources.

[0005] CN110002887A discloses a refractory material resistant to ash erosion under high temperature conditions and a preparation method thereof. The refractory material is made by mixing a refractory raw material and a binder accounting for 5-7% of the mass of the refractory raw material. The refractory raw material is composed of the following components in weight percentage: 40-45% zirconium oxide, 20-25% silicon dioxide, 15-25% chromium oxide, 5-7% magnesium oxide, and 8-10% aluminum oxide. The preparation process is: mix the raw material powders in proportion, add the binder and mix at high temperature, and then cold isostatically press, dry, and sinter to obtain a standard refractory brick. Similarly, the refractory material is not designed for different temperature zones of the furnace body, and its improvement of the refractory material's anti-fly ash erosion performance is limited, and it also leads to a waste of resources.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] One of the purposes of the present invention is to provide a furnace lining for preparing rock wool from fly ash resources, wherein the furnace lining includes a furnace inner wall lining; the furnace inner wall lining includes, from top to bottom, an upper inner wall lining, a middle inner wall lining and a lower inner wall lining, and the furnace inner wall lining is cast using high-chromium corundum casting material. The present invention improves the lining's anti-fly ash erosion performance by using high-chromium corundum casting materials with different composition ratios in the upper inner wall lining, the middle inner wall lining and the lower inner wall lining, thereby significantly extending the service life of the furnace body, effectively protecting the interior of the furnace body, and preventing corrosion of the furnace wall by fluctuations in fly ash raw materials, molten iron, high temperature, etc.

[0008] The second object of the present invention is to provide an application of the furnace lining for preparing rock wool from fly ash resources as the middle and inner lining of a furnace for high-temperature fly ash resource utilization.

[0009] The third object of the present invention is to provide a furnace body for high-temperature resource utilization of fly ash, the furnace body comprising a furnace cover, a furnace chamber, a furnace bottom and a discharge port; the lining of the furnace body is the furnace lining for preparing rock wool from fly ash resources.

[0010] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0011] In a first aspect, the present invention provides a furnace lining for preparing rock wool from fly ash resources, wherein the furnace lining for preparing rock wool from fly ash resources comprises a furnace inner wall lining; the furnace inner wall lining comprises, from top to bottom, an upper inner wall lining, a middle inner wall lining and a lower inner wall lining, and the furnace inner wall lining is cast using chromium-containing corundum casting material;

[0012] The casting material used for the upper inner wall lining includes the following components by mass percentage:

[0013] Cr2O35~15%, Al2O375~85%, SiO21~10%, Fe2O31~2%, CaO 1~5%, MgO 1~2%;

[0014] The casting material used for the middle inner wall lining includes the following components by mass percentage:

[0015] Cr2O360~75%, Al2O320~35%, SiO21~10%, Fe2O31~2%, CaO 1~5%, MgO 1~2%;

[0016] The casting material used for the lower inner wall lining includes the following components by mass percentage:

[0017] Cr2O340~50%, Al2O340~45%, SiO21~10%, Fe2O31~2%, CaO 1~5%, MgO 1~2%.

[0018] In the present invention, the furnace lining used for the resource utilization of fly ash to prepare rock wool is made of high-chromium corundum composite material. According to different temperature zones in the furnace, high-chromium corundum composite linings with different contents of Cr2O3 and Al2O3 are set. The furnace bottom and the lower part are directly in contact with the slag area > the powder area in the furnace cavity > the furnace top; the fly ash erosion resistance of the refractory material is improved in a targeted manner. In addition, the added calcium oxide and iron oxide content increases the flexibility of the refractory lining, significantly prolongs the service life of the furnace body, protects the furnace bottom and the furnace wall, and can also prevent the corrosion of the furnace wall by molten iron.

[0019] Taking the total mass of the components of the casting material used for the upper inner wall lining as 100%, the content of Cr2O3 is 5~15%, for example, it can be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.

[0020] Taking the total mass of the components of the casting material used for the upper inner wall lining as 100%, the content of Al2O3 is 75-85%, for example, it can be 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, etc.

[0021] Taking the total mass of the components of the casting material used for the upper inner wall lining as 100%, the content of SiO2 is 1~10%, for example, it can be 1%, 2%, 3%, 4%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, etc.

[0022] Taking the total mass of the components of the casting material used for the upper inner wall lining as 100%, the content of Fe2O3 is 1~2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0023] Taking the total mass of the components of the casting material used for the upper inner wall lining as 100%, the CaO content is 1-5%, for example, it can be 1%, 2%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, etc.

[0024] Taking the total mass of the components of the casting material used for the upper inner wall lining as 100%, the content of MgO is 1-2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0025] Taking the total mass of the components of the casting material used for the middle inner wall lining as 100%, the content of Cr2O3 is 60-75%, for example, it can be 60%, 60.5%, 61%, 61.5%, 62%, 62.5%, 63%, 63.5%, 64%, 64.5%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, etc.

[0026] Taking the total mass of the components of the casting material used for the middle inner wall lining as 100%, the content of Al2O3 is 20~35%, for example, it can be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, etc.

[0027] Taking the total mass of the components of the casting material used for the middle inner wall lining as 100%, the content of SiO2 is 1~10%, for example, it can be 1%, 2%, 3%, 4%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, etc.

[0028] Taking the total mass of the components of the casting material used for the middle inner wall lining as 100%, the content of Fe2O3 is 1~2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0029] Taking the total mass of the components of the casting material used for the middle inner wall lining as 100%, the CaO content is 1-5%, for example, it can be 1%, 2%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, etc.

[0030] Taking the total mass of the components of the castable used for the middle inner wall lining as 100%, the content of MgO is 1-2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0031] Taking the total mass of the components of the casting material used for the lower inner wall lining as 100%, the content of Cr2O3 is 40-50%, for example, it can be 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, etc.

[0032] Taking the total mass of the components of the casting material used for the lower inner wall lining as 100%, the content of Al2O3 is 40-45%, for example, it can be 40%, 40.5%, 41%, 41.5%, 42%, 42.5%, 43%, 43.5%, 44%, 44.5%, 45%, etc.

[0033] Taking the total mass of the components of the casting material used for the lower inner wall lining as 100%, the content of SiO2 is 1~10%, for example, it can be 1%, 2%, 3%, 4%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, etc.

[0034] Taking the total mass of the components of the casting material used for the lower inner wall lining as 100%, the content of Fe2O3 is 1~2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0035] Taking the total mass of the components of the casting material used for the lower inner wall lining as 100%, the CaO content is 1-5%, for example, it can be 1%, 2%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, etc.

[0036] Taking the total mass of the components of the casting material used for the lower inner wall lining as 100%, the content of MgO is 1-2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0037] Preferably, the thickness of the upper inner wall lining, the middle inner wall lining and the lower inner wall lining are each independently 150~400 mm, for example, they can be 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, 220 mm, 240 mm, 260 mm, 280 mm, 300 mm, 320 mm, 340 mm, 360 mm, 380 mm, 400 mm, etc.

[0038] Preferably, the height of the upper inner wall lining accounts for 25-35% of the total height of the inner wall of the furnace, for example, it can be 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, etc.

[0039] Preferably, the height of the middle inner wall lining accounts for 35-45% of the total height of the inner wall of the furnace, for example, it can be 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, etc.

[0040] Preferably, the height of the lower inner wall lining accounts for 25-35% of the total height of the inner wall of the furnace, for example, it can be 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, etc.

[0041] Preferably, the furnace lining for preparing rock wool from fly ash resources also includes a furnace bottom lining; the furnace bottom lining includes, from top to bottom, a first furnace bottom lining and a second furnace bottom lining; the first furnace bottom lining is corundum bricks, and the second furnace bottom lining is cast with corundum casting material.

[0042] Preferably, the corundum bricks of the first furnace bottom lining layer include the following components by mass percentage:

[0043] Al2O380~95%, SiO21~15%, Fe2O31~2%, CaO 1~5%, MgO 1~2%.

[0044] Taking the total mass of the components of the corundum bricks of the first furnace bottom lining as 100%, the content of Al2O3 is 80~95%, for example, it can be 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, etc.

[0045] Taking the total mass of the components of the corundum bricks of the first furnace bottom lining as 100%, the content of SiO2 is 1~15%, for example, it can be 1%, 2%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.

[0046] Taking the total mass of the components of the corundum bricks of the first furnace bottom lining as 100%, the content of Fe2O3 is 1~2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0047] Taking the total mass of the components of the corundum bricks of the first furnace bottom lining as 100%, the CaO content is 1-5%, for example, 1%, 2%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, etc.

[0048] Taking the total mass of the components of the corundum bricks of the first furnace bottom lining as 100%, the content of MgO is 1-2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0049] Preferably, the corundum casting material of the second furnace bottom lining layer comprises the following components by mass percentage:

[0050] Al2O380~95%, SiO21~15%, Fe2O31~2%, CaO 1~5%, MgO 1~2%.

[0051] Taking the total mass of the components of the corundum castable of the second furnace bottom lining as 100%, the content of Al2O3 is 80-95%, for example, it can be 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, etc.

[0052] Taking the total mass of the components of the corundum castable of the second furnace bottom lining as 100%, the content of SiO2 is 1~15%, for example, it can be 1%, 2%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.

[0053] Taking the total mass of the components of the corundum castable of the second furnace bottom lining as 100%, the content of Fe2O3 is 1-2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0054] Taking the total mass of the components of the corundum castable of the second furnace bottom lining as 100%, the CaO content is 1-5%, for example, 1%, 2%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, etc.

[0055] Taking the total mass of the components of the corundum bricks of the second furnace bottom lining as 100%, the content of MgO is 1-2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0056] Preferably, the total thickness of the furnace bottom lining is 500-1200 mm, for example, it can be 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, 1100 mm, 1200 mm, etc.

[0057] Preferably, the thickness ratio of the first furnace bottom lining and the second furnace bottom lining is 1:(0.5~1.5), for example, it can be 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, etc.

[0058] Preferably, the furnace body lining for preparing rock wool from fly ash resources also includes a furnace cover inner wall lining; the furnace cover inner wall lining is cast using corundum casting material.

[0059] Preferably, the corundum casting material of the inner wall lining of the furnace cover comprises the following components by mass percentage:

[0060] Al2O380~95%, SiO21~15%, Fe2O31~2%, CaO 1~5%, MgO 1~2%.

[0061] Taking the total mass of the components of the corundum casting material of the inner wall lining of the furnace cover as 100%, the content of Al2O3 is 80-95%, for example, it can be 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, etc.

[0062] Taking the total mass of the components of the corundum casting material of the inner wall lining of the furnace cover as 100%, the content of SiO2 is 1~15%, for example, it can be 1%, 2%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.

[0063] Taking the total mass of the components of the corundum casting material of the inner wall lining of the furnace cover as 100%, the content of Fe2O3 is 1~2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0064] Taking the total mass of the components of the corundum castable of the inner wall lining of the furnace cover as 100%, the CaO content is 1-5%, for example, it can be 1%, 2%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, etc.

[0065] Taking the total mass of the components of the corundum castable of the inner wall lining of the furnace cover as 100%, the content of MgO is 1-2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0066] Preferably, the thickness of the inner wall lining of the furnace cover is 150-500 mm, for example, it can be 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, etc.

[0067] Preferably, the furnace lining for recycling fly ash into rock wool also includes an inner wall lining of a discharge port of the furnace; the inner wall lining of the discharge port is a chromium-containing high-density brick.

[0068] Preferably, the chromium-containing high-density brick comprises the following components by mass percentage:

[0069] Cr2O360~65%, Al2O320~35%, SiO21~10%, Fe2O31~2%, CaO 1~5%, MgO 1~2%.

[0070] Taking the total mass of the components of the chromium-containing high-density brick as 100%, the content of Cr2O3 is 60-65%, for example, it can be 60%, 60.5%, 61%, 61.5%, 62%, 62.5%, 63%, 63.5%, 64%, 64.5%, 65%, etc.

[0071] Taking the total mass of the components of the chromium-containing high-density brick as 100%, the content of Al2O3 is 20-35%, for example, it can be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, etc.

[0072] Taking the total mass of the components of the chromium-containing high-density brick as 100%, the content of SiO2 is 1-10%, for example, it can be 1%, 2%, 3%, 4%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, etc.

[0073] Taking the total mass of the components of the chromium-containing high-density brick as 100%, the content of Fe2O3 is 1-2%, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0074] Taking the total mass of the components of the chromium-containing high-density brick as 100%, the content of CaO is 1-5%, for example, 1%, 2%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, etc.

[0075] Taking the total mass of the components of the chromium-containing high-density brick as 100%, the content of MgO is 1-2%, for example, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0076] Preferably, the thickness of the inner wall lining of the discharge port is 150-400 mm, for example, it can be 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, etc.

[0077] Preferably, the discharge port is arranged at 100-500 mm higher than the furnace bottom lining, for example, it can be 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, etc.

[0078] In a second aspect, the present invention provides a use of a furnace lining for preparing rock wool from fly ash resources as described in the first aspect as a middle or inner lining of a furnace for high-temperature fly ash resource utilization.

[0079] In a third aspect, the present invention provides a furnace body for high-temperature resource utilization of fly ash, the furnace body comprising a furnace cover, a furnace chamber, a furnace bottom and a discharge port; the lining of the furnace body is the furnace body lining for preparing rock wool from fly ash resources as described in the first aspect.

[0080] More specifically, the inner wall lining of the furnace cover is cast using corundum casting material.

[0081] The corundum casting material includes the following components in terms of mass percentage: Al2O3 80-95%, SiO2 1-15%, Fe2O3 1-2%, CaO 3-5%, and MgO 1-2%.

[0082] More specifically, the inner wall lining of the furnace comprises, from top to bottom, an upper inner wall lining, a middle inner wall lining and a lower inner wall lining, and the inner wall lining of the furnace is cast using chromium-containing corundum casting material.

[0083] Among them, the casting materials used for the upper inner wall lining include the following components in terms of mass percentage: Cr2O3 5~15%, Al2O3 75~85%, SiO2 5~10%, Fe2O3 1~2%, CaO 3~5%, MgO 1~2%; the casting materials used for the middle inner wall lining include the following components in terms of mass percentage: Cr2O3 60~75%, Al2O3 20~35%, SiO2 5~10%, Fe2O3 1~2%, CaO 3~5%, MgO 1~2%; the casting materials used for the lower inner wall lining include the following components in terms of mass percentage: Cr2O3 40~50%, Al2O3 40~45%, SiO2 5~10%, Fe2O3 1~2%, CaO 3~5%, MgO 1~2%.

[0084] More specifically, the lining of the furnace bottom includes, from top to bottom, a first furnace bottom lining and a second furnace bottom lining; the first furnace bottom lining is corundum bricks, and the second furnace bottom lining is cast with corundum casting material.

[0085] Among them, the corundum bricks of the first furnace bottom lining include the following components by mass percentage: Al2O3 80~95%, SiO2 1~15%, Fe2O3 1~2%, CaO 3~5%, MgO 1~2%; the corundum casting material of the second furnace bottom lining includes the following components by mass percentage: Al2O3 80~95%, SiO2 1~15%, Fe2O3 1~2%, CaO 3~5%, MgO 1~2%.

[0086] More specifically, the inner wall lining of the discharge port is chromium-containing high-density bricks.

[0087] The chromium-containing high-density brick comprises the following components by mass percentage: Cr2O3 60-65%, Al2O3 20-35%, SiO2 5-10%, Fe2O3 1-2%, CaO 3-5%, and MgO 1-2%.

[0088] Compared with the prior art, the present invention has the following beneficial effects:

[0089] (1) The furnace lining for preparing rock wool from fly ash resources of the present invention is targeted to set a high-chromium corundum composite lining with different contents of Cr2O3 and Al2O3 according to different temperature zones in the furnace, thereby significantly improving the anti-fly ash erosion performance of the refractory material;

[0090] (2) The furnace lining for preparing rock wool from fly ash resources described in the present invention increases the flexibility of the refractory lining by adding calcium oxide and iron oxide, significantly prolongs the service life of the furnace body, protects the furnace bottom and furnace wall, and prevents corrosion of the furnace wall by molten iron. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0092] Figure 1 This is a schematic structural diagram of a furnace lining for preparing rock wool from fly ash resources according to the present invention.

[0093] Among them, 1 is the second furnace bottom lining, 2 is the first furnace bottom lining, 3 is the lower inner wall lining, 4 is the middle inner wall lining, 5 is the upper inner wall lining, and 6 is the furnace cover inner wall lining. DETAILED DESCRIPTION

[0094] Unless otherwise defined herein, scientific and technical terms used in conjunction with the present invention shall have the meanings commonly understood by those of ordinary skill in the art. The meaning and scope of the terms should be clear, however, in the case of any potential ambiguity, the definitions provided herein take precedence over any dictionary or external definitions. In this application, unless otherwise stated, the use of "or" means "and / or". In addition, the use of the term "including" and other forms is non-limiting.

[0095] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0096] It should be noted that specific details are described in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in a variety of other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0097] like Figure 1 The structure schematic diagram of the furnace lining for preparing rock wool from fly ash resources of the present invention is shown in FIG. The furnace lining comprises a second furnace bottom lining 1, a first furnace bottom lining 2, a lower inner wall lining 3, a middle inner wall lining 4, an upper inner wall lining 5 and a furnace cover inner wall lining 6.

[0098] Example 1

[0099] This embodiment provides a furnace lining for preparing rock wool from fly ash resources, wherein the furnace lining includes a furnace inner wall lining, a furnace bottom lining, a furnace cover inner wall lining, and a discharge port inner wall lining;

[0100] Ι. The furnace inner wall lining includes, from top to bottom, an upper inner wall lining, a middle inner wall lining and a lower inner wall lining, and the furnace inner wall lining is cast using chromium-containing corundum casting material;

[0101] Among them, the casting material used for the upper inner wall lining includes the following components by mass percentage: Cr2O35%, Al2O385%, SiO25%, Fe2O31%, CaO 3%, MgO 1%;

[0102] The casting material used for the middle inner wall lining includes the following components by mass percentage: Cr2O3 60%, Al2O3 30%, SiO25%, Fe2O3 1%, CaO 3%, MgO 1%;

[0103] The casting material used for the lower inner wall lining includes the following components by mass percentage: Cr2O3 40%, Al2O3 45%, SiO2 10%, Fe2O3 1%, CaO 3%, MgO 1%;

[0104] Among them, the thickness of the upper inner wall lining, the middle inner wall lining and the lower inner wall lining are all 400 mm; the height ratio of the upper inner wall lining, the middle inner wall lining and the lower inner wall lining is 3:4:3.

[0105] Ⅱ. The furnace bottom lining includes, from top to bottom, a first furnace bottom lining and a second furnace bottom lining; the first furnace bottom lining is made of corundum bricks, and the second furnace bottom lining is cast with corundum casting material;

[0106] Among them, the corundum bricks of the first furnace bottom lining include the following components by mass percentage: Al2O380%, SiO215%, Fe2O31%, CaO 3%, MgO 1%;

[0107] Among them, the corundum casting material of the second furnace bottom lining includes the following components by mass percentage: Al2O380%, SiO215%, Fe2O31%, CaO 3%, MgO 1%;

[0108] Wherein, the total thickness of the furnace bottom lining is 500 mm, and the thickness ratio of the first furnace bottom lining to the second furnace bottom lining is 1:1.

[0109] III. The inner wall lining of the furnace cover is cast with corundum casting material;

[0110] Among them, the corundum casting material of the inner wall lining of the furnace cover includes the following components by mass percentage: Al2O380%, SiO215%, Fe2O31%, CaO 3%, MgO 1%;

[0111] Wherein, the thickness of the inner wall lining of the furnace cover is 200 mm.

[0112] IV. The inner wall lining of the discharge port is a chromium-containing high-density brick;

[0113] The chromium-containing high-density brick comprises the following components by mass percentage: Cr2O3 60%, Al2O3 30%, SiO25%, Fe2O3 1%, CaO 3%, and MgO 1%.

[0114] Among them, the thickness of the inner wall lining of the discharge port is 400 mm; the discharge port is arranged 100 mm higher than the furnace bottom lining.

[0115] Example 2

[0116] This embodiment provides a furnace lining for preparing rock wool from fly ash resources, wherein the furnace lining includes a furnace inner wall lining, a furnace bottom lining, a furnace cover inner wall lining, and a discharge port inner wall lining;

[0117] Ι. The furnace inner wall lining includes, from top to bottom, an upper inner wall lining, a middle inner wall lining and a lower inner wall lining, and the furnace inner wall lining is cast using chromium-containing corundum casting material;

[0118] Among them, the casting material used for the upper inner wall lining includes the following components by mass percentage: Cr2O310%, Al2O380%, SiO25%, Fe2O32%, CaO 2%, MgO 1%;

[0119] The casting material used for the middle inner wall lining includes the following components by mass percentage: Cr2O365%, Al2O325%, SiO25%, Fe2O32%, CaO 2%, MgO 1%;

[0120] The casting material used for the lower inner wall lining includes the following components by mass percentage: Cr2O345%, Al2O345%, SiO25%, Fe2O32%, CaO 2%, MgO 1%;

[0121] Among them, the thickness of the upper inner wall lining, the middle inner wall lining and the lower inner wall lining are all 300 mm; the height ratio of the upper inner wall lining, the middle inner wall lining and the lower inner wall lining is 3:4:3.

[0122] Ⅱ. The furnace bottom lining includes, from top to bottom, a first furnace bottom lining and a second furnace bottom lining; the first furnace bottom lining is made of corundum bricks, and the second furnace bottom lining is cast with corundum casting material;

[0123] Among them, the corundum bricks of the first furnace bottom lining include the following components by mass percentage: Al2O390%, SiO25%, Fe2O32%, CaO 2%, MgO 1%;

[0124] Among them, the corundum casting material of the second furnace bottom lining includes the following components by mass percentage: Al2O385%, SiO210%, Fe2O32%, CaO 2%, MgO 1%;

[0125] Wherein, the total thickness of the furnace bottom lining is 800 mm, and the thickness ratio of the first furnace bottom lining to the second furnace bottom lining is 1:1.

[0126] III. The inner wall lining of the furnace cover is cast with corundum casting material;

[0127] Among them, the corundum casting material of the inner wall lining of the furnace cover includes the following components by mass percentage: Al2O390%, SiO25%, Fe2O32%, CaO 3%;

[0128] Wherein, the thickness of the inner wall lining of the furnace cover is 200 mm.

[0129] IV. The inner wall lining of the discharge port is a chromium-containing high-density brick;

[0130] The chromium-containing high-density brick comprises the following components by mass percentage: Cr2O3 62%, Al2O3 28%, SiO 25%, Fe2O 32%, and CaO 3%.

[0131] Among them, the thickness of the inner wall lining of the discharge port is 300 mm; the discharge port is arranged 200 mm higher than the furnace bottom lining.

[0132] Example 3

[0133] This embodiment provides a furnace lining for preparing rock wool from fly ash resources, wherein the furnace lining includes a furnace inner wall lining, a furnace bottom lining, a furnace cover inner wall lining, and a discharge port inner wall lining;

[0134] Ι. The furnace inner wall lining includes, from top to bottom, an upper inner wall lining, a middle inner wall lining and a lower inner wall lining, and the furnace inner wall lining is cast using chromium-containing corundum casting material;

[0135] Among them, the casting material used for the upper inner wall lining includes the following components by mass percentage: Cr2O315%, Al2O375%, SiO25%, Fe2O32%, CaO 2%, MgO 1%;

[0136] The casting material used for the middle inner wall lining includes the following components by mass percentage: Cr2O370%, Al2O320%, SiO25%, Fe2O32%, CaO 2%, MgO 1%;

[0137] The casting material used for the lower inner wall lining includes the following components by mass percentage: Cr2O350%, Al2O340%, SiO25%, Fe2O32%, CaO 2%, MgO 1%;

[0138] Among them, the thickness of the upper inner wall lining, the middle inner wall lining and the lower inner wall lining are all 200 mm; the height ratio of the upper inner wall lining, the middle inner wall lining and the lower inner wall lining is 3:4:3.

[0139] Ⅱ. The furnace bottom lining includes, from top to bottom, a first furnace bottom lining and a second furnace bottom lining; the first furnace bottom lining is made of corundum bricks, and the second furnace bottom lining is cast with corundum casting material;

[0140] Among them, the corundum bricks of the first furnace bottom lining include the following components by mass percentage: Al2O388%, SiO27%, Fe2O32%, CaO 2%, MgO 1%;

[0141] Among them, the corundum casting material of the second furnace bottom lining includes the following components by mass percentage: Al2O385%, SiO210%, Fe2O32%, CaO 2%, MgO 1%;

[0142] Wherein, the total thickness of the furnace bottom lining is 1000 mm, and the thickness ratio of the first furnace bottom lining to the second furnace bottom lining is 1:1.

[0143] III. The inner wall lining of the furnace cover is cast with corundum casting material;

[0144] Among them, the corundum casting material of the inner wall lining of the furnace cover includes the following components by mass percentage: Al2O385%, SiO210%, Fe2O32%, CaO 2%, MgO 1%;

[0145] Wherein, the thickness of the inner wall lining of the furnace cover is 150 mm.

[0146] IV. The inner wall lining of the discharge port is a chromium-containing high-density brick;

[0147] The chromium-containing high-density brick comprises the following components by mass percentage: Cr2O3 65%, Al2O3 20%, SiO2 10%, Fe2O3 2%, CaO 2%, and MgO 1%.

[0148] Among them, the thickness of the inner wall lining of the discharge port is 300 mm; the discharge port is arranged 100 mm higher than the furnace bottom lining.

[0149] Comparative Example 1

[0150] This comparative example provides a furnace body lining, which is different from Example 1 in that Cr2O3 is not added to the casting materials used for the upper inner wall lining, the middle inner wall lining and the lower inner wall lining, and Al2O3 is supplemented to 100%; other settings are exactly the same as Example 1.

[0151] Comparative Example 2

[0152] This comparative example provides a furnace body lining, which is different from Example 1 in that the upper inner wall lining, the middle inner wall lining and the lower inner wall lining are all cast with casting materials of the same components, and the casting materials include the following components by mass percentage: Cr2O35%, Al2O385%, SiO25%, Fe2O31%, CaO 3%, and MgO 1%; other settings are exactly the same as Example 1.

[0153] Comparative Example 3

[0154] This comparative example provides a furnace body lining, which is different from Example 1 in that the upper inner wall lining, the middle inner wall lining and the lower inner wall lining are all cast with casting materials of the same components, and the casting materials include the following components by mass percentage: Cr2O3 20%, Al2O3 70%, SiO25%, Fe2O3 1%, CaO 3%, MgO 1%; other settings are exactly the same as Example 1.

[0155] Comparative Example 4

[0156] This comparative example provides a furnace body lining, which is different from Example 1 in that the upper inner wall lining, the middle inner wall lining and the lower inner wall lining are all cast with casting materials of the same components, and the casting materials include the following components by mass percentage: Cr2O3 40%, Al2O3 45%, SiO2 10%, Fe2O3 1%, CaO 3%, and MgO 1%; other settings are exactly the same as Example 1.

[0157] Test Case

[0158] Test samples: furnace linings for preparing rock wool from fly ash resources provided in Examples 1 to 3, and furnace linings provided in Comparative Examples 1 to 4;

[0159] Test method:

[0160] (1) Refractory property: The maximum refractory temperature of the same specification fly ash recycling furnace equipped with the furnace lining for preparing rock wool from fly ash provided in Examples 1 to 3 and the furnace lining provided in Comparative Examples 1 to 4 was measured respectively;

[0161] (2) Erosion depth: The same specification of fly ash resource recovery furnaces equipped with the furnace linings for preparing rock wool from fly ash resource provided in Examples 1 to 3 and the furnace linings for preparing rock wool from fly ash resource provided in Comparative Examples 1 to 4 were kept at the corresponding maximum refractory temperature for 1 h, and the depth of erosion marks produced on the furnace linings for preparing rock wool from fly ash resource provided in different positions was measured;

[0162] It should be noted that when measuring the erosion marks produced by the furnace lining at different positions, measurements are taken at three different locations in the set sampling area, and the average value is taken as statistical data.

[0163] The specific test results are shown in Table 1:

[0164] Table 1

[0165]

[0166] As shown in Table 1, the maximum refractory temperature of the fly ash melting furnace for the furnace lining for preparing rock wool from fly ash resources according to the present invention can reach above 1650°C, and after keeping at the maximum refractory temperature for 72 hours, it is found that the depth of the traces of fly ash erosion in different areas: the furnace inner wall lining, furnace bottom lining, furnace cover inner wall lining, and discharge port inner wall lining is very small, especially, the furnace bottom lining has no traces of erosion at all, and the traces of erosion of the furnace cover inner wall lining and the discharge port inner wall lining are less than 1 mm. In particular, the traces of erosion of the furnace inner wall lining are slightly higher, but are also less than 15 mm.

[0167] This shows that the furnace lining used for fly ash resource preparation of rock wool is made of high-chromium corundum composite materials. According to different temperature zones in the furnace, high-chromium corundum composite linings with different contents of Cr2O3 and Al2O3 are set. The furnace bottom and lower part are directly in contact with the slag area > the powder area in the furnace cavity > the furnace top; the fly ash erosion resistance of the refractory material is significantly improved in a targeted manner. In addition, the added calcium oxide and iron oxide content increases the flexibility of the refractory lining, significantly prolongs the service life of the furnace body, protects the furnace bottom and furnace wall, and can also prevent the corrosion of the furnace wall by molten iron.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A furnace body for high-temperature recycling of fly ash with a refractory temperature of 1650°C or above, characterized in that: The furnace body comprises a furnace cover, a furnace chamber, a furnace bottom and a discharge port; Wherein, the lining of the furnace body comprises a furnace inner wall lining; the furnace inner wall lining comprises, from top to bottom, an upper inner wall lining, a middle inner wall lining and a lower inner wall lining, and the furnace inner wall linings are all cast by chromium-containing corundum casting material; the casting material used in the upper inner wall lining comprises the following components by mass percentage: Cr2O3 5-15%, Al2O3 75-85%, SiO2 1-10%, Fe2O3 1-2%, CaO 1-5%, MgO 1-2%; the casting material used in the middle inner wall lining comprises the following components by mass percentage: Cr2O3 60-75%, Al2O3 20-35%, SiO2 1-10%, Fe2O3 1-2%, CaO 1-5%, MgO 1-2%; the casting material used in the lower inner wall lining comprises the following components by mass percentage: Cr2O3 40~50%, Al2O340~45%, SiO2 1~10%, Fe2O3 1~2%, CaO 1~5%, MgO 1~2%; Wherein, the lining of the furnace body also includes a furnace bottom lining; the furnace bottom lining includes, from top to bottom, a first furnace bottom lining and a second furnace bottom lining; the first furnace bottom lining is a corundum brick, and the second furnace bottom lining is cast by corundum casting material; the corundum brick of the first furnace bottom lining includes the following components by mass percentage: Al2O3 80-95%, SiO2 1-15%, Fe2O31-2%, CaO 1-5%, MgO 1-2%; the corundum casting material of the second furnace bottom lining includes the following components by mass percentage: Al2O3 80-95%, SiO2 1-15%, Fe2O31-2%, CaO 1-5%, MgO 1-2%; Wherein, the lining of the furnace body also includes the inner wall lining of the furnace cover; the inner wall lining of the furnace cover is cast by corundum casting material; the corundum casting material of the inner wall lining of the furnace cover includes the following components by mass percentage: Al2O3 80-95%, SiO2 1-15%, Fe2O31-2%, CaO 1-5%, MgO 1-2%; Wherein, the lining of the furnace body also includes the inner wall lining of the discharge port of the furnace body; the inner wall lining of the discharge port is a chromium-containing high-density brick; the chromium-containing high-density brick includes the following components by mass percentage: Cr2O3 60-65%, Al2O3 20-35%, SiO2 1-10%, Fe2O3 1-2%, CaO 1-5%, MgO 1-2%; Among them, the thickness of the upper inner wall lining, the middle inner wall lining and the lower inner wall lining are each independently 150~400mm; the height of the upper inner wall lining accounts for 25~35% of the total height of the inner wall of the furnace; the height of the middle inner wall lining accounts for 35~45% of the total height of the inner wall of the furnace; the height of the lower inner wall lining accounts for 25~35% of the total height of the inner wall of the furnace.

2. The furnace body for high-temperature resource utilization of fly ash according to claim 1, characterized in that: The total thickness of the furnace bottom lining is 500-1200 mm; And / or, the thickness ratio of the first furnace bottom lining layer to the second furnace bottom lining layer is 1:(0.5~1.5).

3. The furnace body for high-temperature resource utilization of fly ash according to claim 1, characterized in that: The thickness of the inner wall lining of the furnace cover is 150-500 mm.

4. The furnace body for high-temperature resource utilization of fly ash according to claim 1, characterized in that: The thickness of the inner wall lining of the discharge port is 150-400 mm; And / or, the discharge port is arranged 100-500 mm higher than the furnace bottom lining.

Images