CN104451131A - Powder chrome ore reducing sintering agglomeration technique - Google Patents
Powder chrome ore reducing sintering agglomeration technique Download PDFInfo
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- CN104451131A CN104451131A CN201510010301.7A CN201510010301A CN104451131A CN 104451131 A CN104451131 A CN 104451131A CN 201510010301 A CN201510010301 A CN 201510010301A CN 104451131 A CN104451131 A CN 104451131A
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Abstract
The invention discloses a powder chrome ore reducing sintering agglomeration technique. According to the powder chrome ore reducing sintering agglomeration technique, powder chrome ore, acid silicate waste residues, bentonite and coke powder are smashed to below 200 meshes, then the powder chrome ore, the acid silicate waste residues, the bentonite and the coke powder are placed in a roller to be evenly mixed, the mixture enters a disc pelletizer through a conveyer belt, 8%-16% of water is added to the mixture, full stirring is conducted for rolling palletizing, then sintering is conducted for 60-160 minutes in a sintering disc at the temperature ranging from 700 DEG C to 1300 DEG C, and after a pellet is obtained through sintering, the pellet directly enters an electric furnace to be smelted. The powder chrome ore reducing sintering agglomeration technique solves the technical problems that in the prior art, the palletizing strength is not high enough, pulverization occurs easily, normal operation of the electric furnace is affected, cost is high, and the safety performance is poor.
Description
technical fieldthe invention belongs to the reductive sintered agglomeration technology field of powder chrome ore, be specifically related to the reductive sintered agglomeration of a kind of powder chrome ore and replace the refining of blocky chromium mining and metallurgy to produce the novel process of ferrochrome, be mainly applicable to the furnace charge processing of metallurgical industry and produce.
background technologyin prior art, whole world chrome ore reserves are about 7,600 ten thousand tons, South Africa accounts for 72.4%, wherein massive accounts for 25%, fine ore (particle diameter < 10mm) accounts for 75%, wherein South Africa Duo Jia platinum company exploits and the mine tailing formed after selecting platinum is 27% containing chromium sesquioxide (Cr2O3), is can by a kind of low cost chromium ore resource of ferrochrome industrial utilization.In the chrome ore needed for chromium system J. sigillate, with the raw material that block chrome ore is the best, because in the production process of ferrochrome, the raw materials such as block chrome ore enter in stove, the ventilation property in stove can be improved, not easily sting fire, dust is also few, the working of a furnace can better be controlled, obtain good economic and technical norms, due to the scarcity of China's chromium ore resource, a large amount of chromites need from external import, but the output of block chrome ore is more and more less, also when the river rises the boat goes up for price, block chrome ore with grade will exceed 20% than chrome ore fines price, and the source of powder chrome ore (particle diameter <10mm) relatively extensively and low price.Mainly use block chrome ore when high carbon ferro-chrome produced by submerged arc furnace in the past, the ratio entering fine ore in stove ore is generally no more than 15%, and the too high meeting of ratio entering fine ore in stove ore makes melting electric consumption increase, and the rate of recovery of chromium reduces; And for the production cost of high carbon ferro-chrome, mainly ore, electric power, reductive agent and other associated cost, its proportion is respectively 45-55%, 20-25%, 5-10% and 25%.Therefore, the main path of reduction high carbon ferro-chrome production cost is to reduce ore expense, improve element recovery rate and reduce energy consumption, and the resource of tailings how making full use of fine ore and a large amount of cheapness is the Main way of ferrochrome smelting industrial development; Tradition fine ore treatment process is pressure ball, but the ball bulk strength of compacting is inadequate, can produce fine ore in transportation, not yet arrive the phenomenon that namely a large amount of efflorescence occurs in reaction in furnace district after electric furnace, a large amount of fine ores can have a strong impact on the normal operation of electric furnace and threaten the safety of workman, equipment and factory building.And abroad to reducing roasting technique after the agglomeration processing general employing cold conditions pelletizing of powder chrome ore, this agglomeration method one-time investment is large, technical process is long, is not suitable with medium-sized following electric furnace and produces.In recent years, domesticly carrying out the agglomeration research that the techniques such as powder chrome ore cold-pressing balls consolidation carry out powder chrome ore, not yet forming throughput, exist control golden intensity low, not easily reduce, production cost is high, economic benefit is low problem; At present, major part smelting producer is still and directly enters stove with fine ore, is easy to like this cause blast wandering capable, continues to use consumption indicators and rises.Therefore carry out agglomeration to powder chrome ore and process the use replacing primary block chrome ore, be the problem that domestic and international Ge Xi J. sigillate enterprise and research department attach great importance to always.
summary of the inventionthe object of the invention is to solve prior art to there is pressure ball insufficient strength, easily efflorescence, affect the technical problem that electric furnace runs well, cost is high and security is low, provide the technique of the reductive sintered agglomeration of a kind of powder chrome ore, to make up the deficiencies in the prior art.
The object of the invention is to be achieved through the following technical solutions:
A technique for the reductive sintered agglomeration chrome ore of powder chrome ore, is characterized in that with the water of the acidic silicic acid salt waste residue of the powder chrome ore of 60%-85% by weight ratio, 7%-15%, the wilkinite of 8%-16%, the coke powder of 15%-25% and 8%-16% for raw material;
First powder chrome ore, acidic silicic acid salt waste residue, wilkinite, coke powder are crushed to below 200 orders respectively, again powder chrome ore, acidic silicic acid salt waste residue, wilkinite, coke powder are put into cylinder Homogeneous phase mixing, to be entered in balling disc by conveying belt more afterwards and the water adding 8%-16% fully stirs and carries out rolling pelletizing, finally fire 60-160 minute 700 DEG C-1300 DEG C fire in disk, after sintering balling-up, directly enter electrosmelting.
Raw material variety required in the present invention is few and be commonly easy to get, and the consumption effectively reducing auxiliary material reduces production cost; Slag former is acidic silicic acid salt waste residue, also can be the acid materials such as silica; Binding agent is wilkinite, also can be the materials such as cement; Reductive agent is coke powder, also can be coal dust, coke or its mixture; Directly electrosmelting is entered after the spherical chrome ore sinter molding that the present invention obtains, not easily broken, intensity is high, and preheating reduces energy consumption before entering electric furnace, and the material such as interior siliceous, magnesium, high temperature resistant, spherical chrome ore is entered in body of heater and can keep complete shape, improve the ventilation property of furnace charge, electric furnace can be operated safely normally.The invention solves prior art pressure ball insufficient strength, easily efflorescence, affect the technical problem that electric furnace runs well, cost is high and security is low.
Accompanying drawing explanation
Accompanying drawing is process flow sheet of the present invention.
Embodiment
A technique for the reductive sintered agglomeration chrome ore of powder chrome ore, be with the powder chrome ore of 60% by weight ratio, 9% acidic silicic acid salt waste residue, the wilkinite of 8%, the coke powder of 15% and 8% water for raw material; First powder chrome ore, acidic silicic acid salt waste residue, wilkinite, coke powder are crushed to below 200 orders respectively, again the powder chrome ore after pulverizing, acidic silicic acid salt waste residue, wilkinite, coke powder are put into roller machine Homogeneous phase mixing, to be entered in balling disc by conveying belt more afterwards and the water adding 8% fully stirs and carries out rolling pelletizing, finally fire 140 minutes 800 DEG C fire in disk, after sintering balling-up, directly enter electrosmelting.
Technical process of the present invention is:
Raw material enters the factory → → cylinder batch mixing that puts in storage → prepare burden (one mixes) → balling equipment (two mix) and adds about 8% water → disk sintering → heat expects into electric furnace.
Powder chrome ore enters two feed bins after entering factory, acidic flux feed bin one, wilkinite feed bin one, one, coke powder storehouse, first respectively 200 mesh sieve choosings are crossed to raw material pulverizing, each feed bin is provided with weighing belt, different ratios blanking pressed by raw material, enter first even batch mixing of batch mixing cylinder, enter balling equipment and add about 8% water after batch mixing is even and start pelletizing of rolling, disk sintering machine is entered after pelletizing, adopt coal gas or Sweet natural gas sintering, temperature fires about 140 minutes at 800 DEG C, after sintering, material directly enters electrosmelting, the flue gas produced in production process is through purifying treatment, zero release of pollutant.
Raw material variety required in the present invention is few and be commonly easy to get, and the consumption effectively reducing auxiliary material reduces production cost; Slag former is acidic silicic acid salt waste residue, also can be the acid materials such as silica; Binding agent is wilkinite, also can be the materials such as cement; Reductive agent is coke powder, also can be coal dust, coke or its mixture; Directly electrosmelting is entered after the spherical chrome ore sinter molding that the present invention obtains, not easily broken, intensity is high, and preheating reduces energy consumption before entering electric furnace, and the material such as interior siliceous, magnesium, high temperature resistant, spherical chrome ore is entered in body of heater and can keep complete shape, improve the ventilation property of furnace charge, electric furnace can be operated safely normally.
The present invention can improve the working condition of electrosmelting, reduces every consumption indicators, obtains good Social and economic benef@.
Claims (1)
1. the technique of the reductive sintered agglomeration of powder chrome ore, it is characterized in that the powder chrome ore with 60%-85% by weight ratio, the acidic silicic acid salt waste residue of 7%-15%, the wilkinite of 8%-16%, the coke powder of 15%-25% and the water of 8%-16% are raw material, its preparation technology is as follows: first by powder chrome ore, acidic silicic acid salt waste residue, wilkinite, coke powder is crushed to below 200 orders respectively, again by powder chrome ore, acidic silicic acid salt waste residue, wilkinite, cylinder Homogeneous phase mixing put into by coke powder, to be entered in balling disc by conveying belt more afterwards and the water adding 8%-16% fully stirs and carries out rolling pelletizing, finally fire 60-160 minute 700 DEG C-1300 DEG C fire in disk, directly electrosmelting is entered after sintering balling-up.
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| CN201510010301.7A CN104451131A (en) | 2015-01-09 | 2015-01-09 | Powder chrome ore reducing sintering agglomeration technique |
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| CN201510010301.7A CN104451131A (en) | 2015-01-09 | 2015-01-09 | Powder chrome ore reducing sintering agglomeration technique |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114592123A (en) * | 2021-12-27 | 2022-06-07 | 福建通海镍业科技有限公司 | Chromium ore powder ball and preparation method thereof |
| CN114921604A (en) * | 2022-04-02 | 2022-08-19 | 徐州宏阳新材料科技股份有限公司 | Smelting method of high-carbon ferrochrome |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5312710A (en) * | 1976-07-22 | 1978-02-04 | Nisshin Steel Co Ltd | Production of sintered chronium ores having good hot nature |
| CN1091779A (en) * | 1993-03-02 | 1994-09-07 | 锦州铁合金厂 | Technique for smelting ferrochrome using powdered Cr ore reductive sintered blocks |
| CN101608261A (en) * | 2009-06-28 | 2009-12-23 | 杨国尧 | The method of producing high carbon ferro-chrome by using chromite powder |
| CN101705356A (en) * | 2009-12-07 | 2010-05-12 | 中南大学 | Sintering technology of ferrochrome mineral powder |
| CN103045854A (en) * | 2011-10-12 | 2013-04-17 | 中国中化股份有限公司 | Pretreatment method for chromium powder ore used for smelting production of ferrochrome alloy |
-
2015
- 2015-01-09 CN CN201510010301.7A patent/CN104451131A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5312710A (en) * | 1976-07-22 | 1978-02-04 | Nisshin Steel Co Ltd | Production of sintered chronium ores having good hot nature |
| CN1091779A (en) * | 1993-03-02 | 1994-09-07 | 锦州铁合金厂 | Technique for smelting ferrochrome using powdered Cr ore reductive sintered blocks |
| CN101608261A (en) * | 2009-06-28 | 2009-12-23 | 杨国尧 | The method of producing high carbon ferro-chrome by using chromite powder |
| CN101705356A (en) * | 2009-12-07 | 2010-05-12 | 中南大学 | Sintering technology of ferrochrome mineral powder |
| CN103045854A (en) * | 2011-10-12 | 2013-04-17 | 中国中化股份有限公司 | Pretreatment method for chromium powder ore used for smelting production of ferrochrome alloy |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114592123A (en) * | 2021-12-27 | 2022-06-07 | 福建通海镍业科技有限公司 | Chromium ore powder ball and preparation method thereof |
| CN114592123B (en) * | 2021-12-27 | 2024-05-10 | 福建通海镍业科技有限公司 | Chromium ore powder ball and preparation method thereof |
| CN114921604A (en) * | 2022-04-02 | 2022-08-19 | 徐州宏阳新材料科技股份有限公司 | Smelting method of high-carbon ferrochrome |
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