CN113649523A - Raw material ore pretreatment process for bauxite processing - Google Patents
Raw material ore pretreatment process for bauxite processing Download PDFInfo
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- CN113649523A CN113649523A CN202110949480.6A CN202110949480A CN113649523A CN 113649523 A CN113649523 A CN 113649523A CN 202110949480 A CN202110949480 A CN 202110949480A CN 113649523 A CN113649523 A CN 113649523A
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- 239000002994 raw material Substances 0.000 title claims abstract description 199
- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 73
- 239000000047 product Substances 0.000 claims abstract description 41
- 239000006227 byproduct Substances 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 16
- 239000011435 rock Substances 0.000 claims abstract description 8
- 238000012216 screening Methods 0.000 claims abstract description 8
- 239000002689 soil Substances 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 72
- 238000003723 Smelting Methods 0.000 claims description 44
- 229910052742 iron Inorganic materials 0.000 claims description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 24
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 23
- 229910052863 mullite Inorganic materials 0.000 claims description 23
- 229910000805 Pig iron Inorganic materials 0.000 claims description 22
- 229910052593 corundum Inorganic materials 0.000 claims description 16
- 239000010431 corundum Substances 0.000 claims description 16
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 239000000571 coke Substances 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 3
- 150000004706 metal oxides Chemical class 0.000 abstract description 3
- 238000006722 reduction reaction Methods 0.000 abstract description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 2
- 229910001950 potassium oxide Inorganic materials 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
- 229910001948 sodium oxide Inorganic materials 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/10—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 aluminium oxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/16—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 silicates other than clay
- C04B35/18—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 silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
- C21B11/10—Making pig-iron other than in blast furnaces in electric furnaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a raw material ore pretreatment process for bauxite processing, which comprises the following steps of S1: preparing ores: selecting bauxite, and separating large rocks or soil in the bauxite through a screening mechanism; s2: grouping ores: dividing the ore in S1 into three parts, namely a raw material 1, a raw material 2 and a raw material 3, continuously dividing the raw material powder in the raw material 1 into A1 groups and B1 groups, wherein the A1 groups and the B1 groups have the same weight, continuously dividing the raw material powder in the raw material 2 into A2 groups and B3 groups, and the A1 groups and the B1 groups have the same weight; s3: roasting raw materials: and roasting the bauxite raw material in the S2 in a rotary kiln at the roasting temperature of 750-800 ℃ for 30 minutes. Under the action of arc heat and resistance heat of the electric furnace, metal oxide and carbon are subjected to reduction reaction, and products and byproducts meet the requirements when a reducing agent is properly adjusted.
Description
Technical Field
The invention relates to the technical field of bauxite pretreatment processes, in particular to a raw material ore pretreatment process for bauxite processing.
Background
Bauxite is also called alumina or bauxite, the main component of which is alumina, which is hydrated alumina containing impurities and is a soil-like mineral. White or off-white, brownish yellow or reddish due to iron. It is generally accepted in china that: bauxite refers to an ore with a high aluminum content (more than 40%), an Al/Si ratio of more than 2.5 (A/S is more than or equal to 2.5), and when the Al/Si ratio is less than the Al/Si ratio, the ore is called clay ore, bauxite or aluminous shale "
At present, bauxite products are more, so that products and byproducts produced by pretreatment are different, and the pretreatment is inconvenient for exploring and producing 60 mullite, 70 mullite, brown corundum, byproduct pig iron, brown corundum ferrosilicon and casting sand, so that a raw material ore pretreatment process for bauxite processing is provided for solving the problems.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a raw material ore pretreatment process for bauxite processing.
The invention provides a raw material ore pretreatment process for bauxite processing, which comprises the following steps:
s1: preparing ores: selecting bauxite, and separating large rocks or soil in the bauxite through a screening mechanism;
s2: grouping ores: dividing the ore in S1 into three parts, namely a raw material 1, a raw material 2 and a raw material 3, continuously dividing the raw material powder in the raw material 1 into A1 groups and B1 groups, wherein the A1 groups and the B1 groups have the same weight, continuously dividing the raw material powder in the raw material 2 into A2 groups and B3 groups, and the A1 groups and the B1 groups have the same weight;
s3: roasting raw materials: roasting the bauxite raw material in the S2 in a rotary kiln at the roasting temperature of 750-800 ℃ for 30 minutes;
s4: pre-removing iron from raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A1 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 60 mullite and a byproduct pig iron;
s5: pre-iron and silicon removal of raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining target products of brown corundum and brown corundum ferrosilicon;
s6: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s7: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into B2 group bauxite in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s8: treating raw materials 3: the raw material 3 is directly added into an electric furnace without adding a reducing agent for electric smelting, so that the target product casting sand is obtained.
Preferably, the A1 and the B1 in the S2 are set to be 1500kg, A2 and B3 in each group, 1500kg in each group, and 1500kg in the raw material 3.
Preferably, the raw materials in S4, S5, S6 and S7 are mixed by a mixer, the rotating speed of the mixer during mixing is set to 200-300r/min, and the mixing time of the mixer is set to 30-50 min.
Preferably, the reducing agent is provided as metallurgical coke.
Preferably, the smelting temperature is controlled to be 1850 ℃ to 2100 ℃.
Preferably, there are three layers after the casting: the lower layer is iron and ferrosilicon alloy, the middle layer is alumina and silica frit, and the upper layer is scum.
Preferably, the electric furnace is set as a 140KVA electric furnace or a 150KVA electric furnace.
The invention has the beneficial effects that: under the action of arc heat and resistance heat of the electric furnace, the metal oxide and carbon are subjected to reduction reaction. Because the titanium oxide, the calcium oxide, the magnesium oxide and the trace amount form 80% of the melted middle layer, the potassium oxide, the sodium oxide and the loss on ignition are 0% respectively, the total amount of the aluminum oxide and the silicon oxide is the rest, the proportion is calculated according to the proportion of the raw ore, the smelting temperature is controlled to be 1850-2100 ℃, and the product and the byproduct meet the requirements when the reducing agent is adjusted properly.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example one
The embodiment provides a raw material ore pretreatment process for bauxite processing, which comprises the following steps:
s1: preparing ores: selecting bauxite, and separating large rocks or soil in the bauxite through a screening mechanism;
s2: grouping ores: dividing the ore in S1 into three parts, namely a raw material 1, a raw material 2 and a raw material 3, continuously dividing the raw material powder in the raw material 1 into A1 groups and B1 groups, wherein the A1 groups and the B1 groups have the same weight, continuously dividing the raw material powder in the raw material 2 into A2 groups and B3 groups, and the A1 groups and the B1 groups have the same weight;
s3: roasting raw materials: roasting the bauxite raw material in the S2 in a rotary kiln at the roasting temperature of 750 ℃ for 30 minutes;
s4: pre-removing iron from raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A1 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 60 mullite and a byproduct pig iron;
s5: pre-iron and silicon removal of raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining target products of brown corundum and brown corundum ferrosilicon;
s6: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s7: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into B2 group bauxite in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s8: treating raw materials 3: the raw material 3 is directly added into an electric furnace without adding a reducing agent for electric smelting, so that the target product casting sand is obtained.
In this example, A1 and B1 in S2 were set at 1500kg for each group, A2 and B3 for each group, and 1500kg for the raw material 3.
In the present example, the raw materials in S4, S5, S6 and S7 were mixed by a mixer, and the rotation speed of the mixer was set to 200r/min and the mixing time of the mixer was set to 50 min.
In this embodiment, the reducing agent is provided as metallurgical coke.
In this example, the smelting temperature was controlled at 1850 ℃.
In this embodiment, there are three layers after pouring: the lower layer is iron and ferrosilicon alloy, the middle layer is alumina and silica frit, and the upper layer is scum.
In this example, the electric furnace was set to a 140KVA electric furnace.
Example two
The embodiment provides a raw material ore pretreatment process for bauxite processing, which comprises the following steps:
s1: preparing ores: selecting bauxite, and separating large rocks or soil in the bauxite through a screening mechanism;
s2: grouping ores: dividing the ore in S1 into three parts, namely a raw material 1, a raw material 2 and a raw material 3, continuously dividing the raw material powder in the raw material 1 into A1 groups and B1 groups, wherein the A1 groups and the B1 groups have the same weight, continuously dividing the raw material powder in the raw material 2 into A2 groups and B3 groups, and the A1 groups and the B1 groups have the same weight;
s3: roasting raw materials: roasting the bauxite raw material in the S2 in a rotary kiln at the roasting temperature of 750 ℃ for 30 minutes;
s4: pre-removing iron from raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A1 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 60 mullite and a byproduct pig iron;
s5: pre-iron and silicon removal of raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining target products of brown corundum and brown corundum ferrosilicon;
s6: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s7: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into B2 group bauxite in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s8: treating raw materials 3: the raw material 3 is directly added into an electric furnace without adding a reducing agent for electric smelting, so that the target product casting sand is obtained.
In this example, A1 and B1 in S2 were set at 1500kg for each group, A2 and B3 for each group, and 1500kg for the raw material 3.
In the present example, the raw materials in S4, S5, S6 and S7 were mixed by a mixer, and the rotation speed of the mixer was set to 200r/min and the mixing time of the mixer was set to 50 min.
In this embodiment, the reducing agent is provided as metallurgical coke.
In this example, the smelting temperature was controlled at 1850 ℃.
In this embodiment, there are three layers after pouring: the lower layer is iron and ferrosilicon alloy, the middle layer is alumina and silica frit, and the upper layer is scum.
In this example, the electric furnace was set to a 150KVA electric furnace.
EXAMPLE III
The embodiment provides a raw material ore pretreatment process for bauxite processing, which comprises the following steps:
s1: preparing ores: selecting bauxite, and separating large rocks or soil in the bauxite through a screening mechanism;
s2: grouping ores: dividing the ore in S1 into three parts, namely a raw material 1, a raw material 2 and a raw material 3, continuously dividing the raw material powder in the raw material 1 into A1 groups and B1 groups, wherein the A1 groups and the B1 groups have the same weight, continuously dividing the raw material powder in the raw material 2 into A2 groups and B3 groups, and the A1 groups and the B1 groups have the same weight;
s3: roasting raw materials: roasting the bauxite raw material in the S2 in a rotary kiln at 800 ℃ for 30 minutes;
s4: pre-removing iron from raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A1 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 60 mullite and a byproduct pig iron;
s5: pre-iron and silicon removal of raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining target products of brown corundum and brown corundum ferrosilicon;
s6: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s7: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into B2 group bauxite in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s8: treating raw materials 3: the raw material 3 is directly added into an electric furnace without adding a reducing agent for electric smelting, so that the target product casting sand is obtained.
In this example, A1 and B1 in S2 were set at 1500kg for each group, A2 and B3 for each group, and 1500kg for the raw material 3.
In the present embodiment, the raw materials in S4, S5, S6 and S7 are mixed by a mixer, and the rotation speed of the mixer is set to 300r/min and the mixing time of the mixer is set to 30 min.
In this embodiment, the reducing agent is provided as metallurgical coke.
In this example, the smelting temperature was controlled at 2100 ℃.
In this embodiment, there are three layers after pouring: the lower layer is iron and ferrosilicon alloy, the middle layer is alumina and silica frit, and the upper layer is scum.
In this example, the electric furnace was set to a 140KVA electric furnace.
Example four
The embodiment provides a raw material ore pretreatment process for bauxite processing, which comprises the following steps:
s1: preparing ores: selecting bauxite, and separating large rocks or soil in the bauxite through a screening mechanism;
s2: grouping ores: dividing the ore in S1 into three parts, namely a raw material 1, a raw material 2 and a raw material 3, continuously dividing the raw material powder in the raw material 1 into A1 groups and B1 groups, wherein the A1 groups and the B1 groups have the same weight, continuously dividing the raw material powder in the raw material 2 into A2 groups and B3 groups, and the A1 groups and the B1 groups have the same weight;
s3: roasting raw materials: roasting the bauxite raw material in the S2 in a rotary kiln at 800 ℃ for 30 minutes;
s4: pre-removing iron from raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A1 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 60 mullite and a byproduct pig iron;
s5: pre-iron and silicon removal of raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining target products of brown corundum and brown corundum ferrosilicon;
s6: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s7: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into B2 group bauxite in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s8: treating raw materials 3: the raw material 3 is directly added into an electric furnace without adding a reducing agent for electric smelting, so that the target product casting sand is obtained.
In this example, A1 and B1 in S2 were set at 1500kg for each group, A2 and B3 for each group, and 1500kg for the raw material 3.
In the present embodiment, the raw materials in S4, S5, S6 and S7 are mixed by a mixer, and the rotation speed of the mixer is set to 300r/min and the mixing time of the mixer is set to 30 min.
In this embodiment, the reducing agent is provided as metallurgical coke.
In this example, the smelting temperature was controlled at 2100 ℃.
In this embodiment, there are three layers after pouring: the lower layer is iron and ferrosilicon alloy, the middle layer is alumina and silica frit, and the upper layer is scum.
In this example, the electric furnace was set to a 150KVA electric furnace.
EXAMPLE five
The embodiment provides a raw material ore pretreatment process for bauxite processing, which comprises the following steps:
s1: preparing ores: selecting bauxite, and separating large rocks or soil in the bauxite through a screening mechanism;
s2: grouping ores: dividing the ore in S1 into three parts, namely a raw material 1, a raw material 2 and a raw material 3, continuously dividing the raw material powder in the raw material 1 into A1 groups and B1 groups, wherein the A1 groups and the B1 groups have the same weight, continuously dividing the raw material powder in the raw material 2 into A2 groups and B3 groups, and the A1 groups and the B1 groups have the same weight;
s3: roasting raw materials: roasting the bauxite raw material in the S2 in a rotary kiln at 800 ℃ for 30 minutes;
s4: pre-removing iron from raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A1 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 60 mullite and a byproduct pig iron;
s5: pre-iron and silicon removal of raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining target products of brown corundum and brown corundum ferrosilicon;
s6: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s7: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into B2 group bauxite in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s8: treating raw materials 3: the raw material 3 is directly added into an electric furnace without adding a reducing agent for electric smelting, so that the target product casting sand is obtained.
In this example, A1 and B1 in S2 were set at 1500kg for each group, A2 and B3 for each group, and 1500kg for the raw material 3.
In the present embodiment, the raw materials in S4, S5, S6 and S7 are mixed by a mixer, and the rotation speed of the mixer is set to 250r/min and the mixing time of the mixer is set to 40 min.
In this embodiment, the reducing agent is provided as metallurgical coke.
In this example, the smelting temperature was controlled at 2000 ℃.
In this embodiment, there are three layers after pouring: the lower layer is iron and ferrosilicon alloy, the middle layer is alumina and silica frit, and the upper layer is scum.
In this example, the electric furnace was set to a 150KVA electric furnace.
In the invention: under the action of arc heat and resistance heat of the electric furnace, the metal oxide and carbon are subjected to reduction reaction. Because of gasification and melting into the lower layer and the upper layer, the weight proportion of the titanium oxide, the calcium oxide, the magnesium oxide and the trace amount which form the melting into the middle layer is respectively 80 percent of that of the raw ore, the weight proportion of the potassium oxide, the sodium oxide and the loss on ignition is respectively 0 percent, and the total weight of the aluminum oxide and the silicon oxide is the rest, and the proportion is calculated according to the proportion of the raw ore. Meanwhile, the smelting temperature is controlled to be 1850 ℃ to 2100 ℃. When the reducing agent is properly adjusted, the product and the by-product meet the requirements.
The analysis of chemical multi-elements, product elements and by-product elements in the bauxite in the above embodiment are respectively shown in the table;
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A raw material ore pretreatment process for bauxite processing is characterized by comprising the following steps:
s1: preparing ores: selecting bauxite, and separating large rocks or soil in the bauxite through a screening mechanism;
s2: grouping ores: dividing the ore in S1 into three parts, namely a raw material 1, a raw material 2 and a raw material 3, continuously dividing the raw material powder in the raw material 1 into A1 groups and B1 groups, wherein the A1 groups and the B1 groups have the same weight, continuously dividing the raw material powder in the raw material 2 into A2 groups and B3 groups, and the A1 groups and the B1 groups have the same weight;
s3: roasting raw materials: roasting the bauxite raw material in the S2 in a rotary kiln at the roasting temperature of 750-800 ℃ for 30 minutes;
s4: pre-removing iron from raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A1 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 60 mullite and a byproduct pig iron;
s5: pre-iron and silicon removal of raw material S1: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 1, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining target products of brown corundum and brown corundum ferrosilicon;
s6: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into bauxite of group A2 in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s7: pre-removing iron from raw material S2: adding a reducing agent (calculating the adding and adding proportion of the reducing agent) into B2 group bauxite in the raw material 2, mixing, and then adding the raw material into an electric furnace for electric smelting, thereby obtaining a target product 70 mullite and a byproduct pig iron;
s8: treating raw materials 3: the raw material 3 is directly added into an electric furnace without adding a reducing agent for electric smelting, so that the target product casting sand is obtained.
2. The process of claim 1, wherein the amount of A1 and B1 in S2 is 1500kg per group, and the amounts of A2 and B3 are 1500kg per group, and the amount of raw material 3 is 1500 kg.
3. The pretreatment process for raw material ore for bauxite processing according to claim 1, wherein the raw materials in S4, S5, S6 and S7 are mixed by a mixer, and the rotation speed of the mixer is set to 200-300r/min and the mixing time of the mixer is set to 30-50 min.
4. The process of claim 1, wherein the reducing agent is provided as metallurgical coke.
5. The process of claim 1, wherein the smelting temperature is controlled to be 1850 ℃ to 2100 ℃.
6. The process of claim 1, wherein the casting is followed by three layers: the lower layer is iron and ferrosilicon alloy, the middle layer is alumina and silica frit, and the upper layer is scum.
7. The process of pretreating a raw material ore for bauxite processing according to claim 1, wherein the electric furnace is a 140KVA electric furnace or a 150KVA electric furnace.
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