CN115161469A - Production method of high-proportion south Africa chromium ore pellets - Google Patents
Production method of high-proportion south Africa chromium ore pellets Download PDFInfo
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- CN115161469A CN115161469A CN202210856141.8A CN202210856141A CN115161469A CN 115161469 A CN115161469 A CN 115161469A CN 202210856141 A CN202210856141 A CN 202210856141A CN 115161469 A CN115161469 A CN 115161469A
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- pellets
- proportion
- south africa
- roasting
- filter cake
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- 239000008188 pellet Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 11
- 239000011651 chromium Substances 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000012065 filter cake Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- 238000005453 pelletization Methods 0.000 claims abstract description 11
- 239000012141 concentrate Substances 0.000 claims abstract description 10
- 238000000498 ball milling Methods 0.000 claims abstract description 8
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 229910000278 bentonite Inorganic materials 0.000 claims description 6
- 239000000440 bentonite Substances 0.000 claims description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 6
- 239000010935 stainless steel Substances 0.000 abstract description 5
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 5
- 239000000047 product Substances 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 6
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a production method of high-proportion south Africa chromium powder pellets, which comprises the steps of preparing materials, ball milling, filtering by ceramics, preparing materials for the second time, pelletizing and roasting to prepare finished products, and solves the problems that the particle size of a filter cake is too coarse in the production process, the water adding amount of a mixer is more, the pellets entering a furnace are mixed, the pellets are not roasted completely, the powder rate of the finished pellets is high and the like by adjusting technological parameters; the method for producing the south Africa concentrate powder chromium ore pellets can well reduce the ore cost, simultaneously enables the stainless steel smelting raw materials to be more diversified, and has good social and economic benefits.
Description
Technical Field
The invention belongs to the technical field of roasting processes of ferroalloy roasting furnaces, relates to the production of south Africa chromium ore pellets, and particularly relates to a production method of high-proportion south Africa chromium ore pellets.
Background
Ferrochrome is an alloy material added in the process of smelting stainless steel, and is an indispensable material for stainless steel smelting. The smelting of ferrochrome is generally carried out by adopting a submerged arc furnace in China, and the main raw materials comprise south Africa concentrate powder and Turkish concentrate powder, wherein the south Africa concentrate powder is low in price, but high-grade ferrochrome is difficult to smelt due to low ferrochrome content, and the smelting difficulty is high due to the fact that furnace slag is high in acidity and low in magnesium-aluminum ratio, so that the smelting cost of ferrochrome is greatly increased.
With the continuous decrease of the domestic steel market, the iron alloy enterprise closely related to the steel industry also holds great efforts, and in the face of the continuous decrease of the ferrochrome price, the iron alloy enterprise urgently needs a new production process to break through the situation that the cost of the raw materials is high and can not be reduced.
Disclosure of Invention
The invention aims to provide a production method of high-proportion south Africa chromium ore pellets so as to reduce the raw material cost of the pellets.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a production method of high-proportion south Africa chromium ore pellets comprises the following steps:
step 1, primary material preparation, namely mixing south Africa concentrate powder and coke powder in a proportion of 100:1.6-100:2.8 mixing in proportion;
step 2, ball milling, namely feeding the materials subjected to primary batching into a wet ball mill through a belt, adding water according to the concentration of 71% -74%, adjusting the adding amount of steel balls of the ball mill to control the granularity of a filter cake, wherein the control range of the-200-mesh content of the filter cake is 82% -84%;
step 3, ceramic filtration is carried out, solid-liquid separation of the ore pulp after ball milling is completed, and a filter cake with 9.0-9.5% of water is obtained by adjusting the vacuum degree;
step 4, secondary material preparation, namely adding bentonite as a binder, a desulfurizer as an auxiliary material and dust in the filtered filter cake, wherein the mass percent of the added bentonite is 1.3-1.35%
Step 5, pelletizing, namely uniformly mixing the raw and auxiliary materials of the secondary batching, adding a proper amount of water, increasing the pelletizing water to 10-10.5%, increasing the gap of a roller screen to 10-20mm, and reducing the rotating speed of the roller to 60-80 r/min so as to increase the green pellet screening time and reduce the inclusion entering a roasting furnace;
step 6, roasting, conveying the green pellets produced by pelletizing to a roasting furnace through a belt, controlling the temperature of a drying section of the roasting furnace to be 380-500 ℃, the temperature of a heating section to be 1000-1050 ℃, the temperature of a roasting section to be 1100-1150 ℃ and the temperature of a cooling section to be not higher than 1300 DEG C
And 7, screening and transferring finished chromium pellets, and supplying and storing bedding materials.
The invention has the beneficial effects that:
the south Africa concentrate powder chromium ore pellet produced by the method can well reduce the ore cost, simultaneously enables the stainless steel smelting raw materials to be more diversified, and has good social and economic benefits.
Detailed Description
The present invention will be further described with reference to the following examples.
Examples
The process control parameters of a batching system, a ball milling system, a ceramic filtering system, a secondary batching system, a pelletizing system, a roasting system and a finished product system are researched according to the process sequence by a company, necessary adjustment is carried out according to the characteristics of south African ores, the proportion of south African concentrate powder is adjusted to 90% from the previous 40%, a plurality of problems occur in the initial production process, the particle size of a filter cake is too coarse, the water adding amount of a mixer is too much, pellets entering a furnace are mixed, the pellets are not roasted completely, the powder rate of finished pellets is high, and the problems are all improved greatly by adjusting the technical parameters.
A production method of high-proportion south Africa chromium ore pellets comprises the following steps:
step 1, primary material preparation, namely mixing south Africa concentrate powder and coke powder in a proportion of 100:1.6-100:2.8 mixing in proportion;
step 2, ball milling, namely feeding the materials subjected to primary batching into a wet ball mill through a belt, adding water according to the concentration of 71% -74%, adjusting the adding amount of steel balls of the ball mill to control the granularity of a filter cake, wherein the content of the filter cake in a 200-mesh range is controlled to be 82% -84%;
step 3, ceramic filtration is carried out, solid-liquid separation of the ore pulp after ball milling is completed, a filter cake with 9.0-9.5% of water is obtained by adjusting the vacuum degree, and the influence of low water on the subsequent process is avoided;
step 4, secondary material preparation, namely adding bentonite as a binder and other auxiliary materials, namely a desulfurizer and dust, into the filtered filter cake, wherein the bentonite is added in a mass percentage of 1.3-1.35 percent due to poor cohesiveness and poor hydrophilicity of the south African mineral powder
Step 5, pelletizing, namely uniformly mixing the raw and auxiliary materials of the secondary batching, adding a proper amount of water, increasing the pelletizing water to 10-10.5%, increasing the gap of a roller screen to 10-20mm, and reducing the rotating speed of the roller to 60-80 r/min so as to increase the green pellet screening time and reduce the inclusion entering a roasting furnace; the clearance of the roller screen is increased by 2mm, so that more large-size mother balls are increased in the pellet circulating material, and the problems of slow growth of green balls, small granularity of pellets entering a furnace, poor quality of pellets entering the furnace, low yield, excessive circulating belt material amount, belt pressing and stopping and the like are solved; the rotating speed of the roller feeder is reduced and is adjusted to 60r/min-80r/min from 120r/min-165r/min, the retention time of materials on the roller feeder is increased, the upward and forward acting force of the rollers on the green pellets is reduced, unqualified pellets in the green pellets and small particles carried by the green pellets can enter an undersize belt more easily, the air permeability of a material bed is greatly improved, a main process fan can provide enough roasting air volume under the condition of low rotating speed, and the problem of poor quality of the initial roasted pellets by adopting high-proportion south African mineral powder is effectively improved
Step 6, roasting, conveying the green pellets produced by pelletizing to a roasting furnace through a belt, controlling the temperature of a drying section of the roasting furnace to be 380-500 ℃, the temperature of a heating section to be 1000-1050 ℃, the temperature of a roasting section to be 1100-1150 ℃, and the temperature of a cooling section to be not higher than 1300 DEG C
And 7, screening and transferring finished products, and supplying and storing bedding materials.
By adjusting the technological parameters, the method improves the problems of coarse particle size of filter cakes, more water added by a mixer, inclusion of pellets in a furnace, incomplete pellet roasting, high pellet powder rate of finished products and the like in the production process, and greatly adjusts the inherent roller screen gap and the roller rotating speed of production equipment, thereby solving the problems of low pellet quality and difficult yield improvement; the south Africa concentrate powder chromium ore pellet produced by the method can well reduce the ore cost, simultaneously enables the stainless steel smelting raw materials to be more diversified, and has good social and economic benefits.
Claims (1)
1. A production method of high-proportion south Africa chromium ore pellets is characterized by comprising the following steps: the method comprises the following steps:
step 1, primary material preparation, namely mixing south Africa concentrate powder and coke powder in a proportion of 100:1.6-100:2.8 mixing in proportion;
step 2, ball milling, namely feeding the materials subjected to primary batching into a wet ball mill through a belt, adding water according to the concentration of 71% -74%, adjusting the adding amount of steel balls of the ball mill to control the granularity of a filter cake, wherein the content of the filter cake in a 200-mesh range is controlled to be 82% -84%;
step 3, ceramic filtration is carried out, solid-liquid separation of the ore pulp after ball milling is completed, and a filter cake with the water content of 9.0-9.5% is obtained by adjusting the vacuum degree;
step 4, secondary material preparation, namely adding bentonite as a binder and a desulfurizer as an auxiliary material and dust in the filtered filter cake, wherein the mass percent of the added bentonite is 1.3-1.35%
Step 5, pelletizing, namely uniformly mixing the raw and auxiliary materials of the secondary batching, adding a proper amount of water, increasing the pelletizing water to 10-10.5%, increasing the gap of a roller screen to 10-20mm, and reducing the rotating speed of the roller to 60-80 r/min so as to increase the green pellet screening time and reduce the inclusion entering a roasting furnace;
step 6, roasting, conveying the green pellets produced by pelletizing to a roasting furnace through a belt, controlling the temperature of a drying section of the roasting furnace to be 380-500 ℃, the temperature of a heating section to be 1000-1050 ℃, the temperature of a roasting section to be 1100-1150 ℃, and the temperature of a cooling section to be not higher than 1300 DEG C
And 7, screening and transferring finished pellets, and supplying and storing bedding materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210856141.8A CN115161469A (en) | 2022-07-21 | 2022-07-21 | Production method of high-proportion south Africa chromium ore pellets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210856141.8A CN115161469A (en) | 2022-07-21 | 2022-07-21 | Production method of high-proportion south Africa chromium ore pellets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115161469A true CN115161469A (en) | 2022-10-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210856141.8A Pending CN115161469A (en) | 2022-07-21 | 2022-07-21 | Production method of high-proportion south Africa chromium ore pellets |
Country Status (1)
| Country | Link |
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| CN (1) | CN115161469A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608261A (en) * | 2009-06-28 | 2009-12-23 | 杨国尧 | The method of producing high carbon ferro-chrome by using chromite powder |
| WO2012057593A1 (en) * | 2010-10-27 | 2012-05-03 | Shadiev Fazil Kayumovich | Method for melting high-carbon ferrochrome |
| CN104593585A (en) * | 2014-04-15 | 2015-05-06 | 丰镇市新太新材料科技有限公司 | Chromium ore pellet pre-reduction direct-supply submerged arc furnace system and pre-reduction direct-supply method |
| CN104745797A (en) * | 2015-04-13 | 2015-07-01 | 中钢集团吉林机电设备有限公司 | Material distributing method for sintering of chromite fine powder pellets |
| WO2017063250A1 (en) * | 2015-10-14 | 2017-04-20 | 福建鼎信实业有限公司 | Production method for hot-delivering oxidized pellets in shaft furnace to sealed ferrochrome electric furnace |
| 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 |
-
2022
- 2022-07-21 CN CN202210856141.8A patent/CN115161469A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608261A (en) * | 2009-06-28 | 2009-12-23 | 杨国尧 | The method of producing high carbon ferro-chrome by using chromite powder |
| WO2012057593A1 (en) * | 2010-10-27 | 2012-05-03 | Shadiev Fazil Kayumovich | Method for melting high-carbon ferrochrome |
| CN104593585A (en) * | 2014-04-15 | 2015-05-06 | 丰镇市新太新材料科技有限公司 | Chromium ore pellet pre-reduction direct-supply submerged arc furnace system and pre-reduction direct-supply method |
| CN104745797A (en) * | 2015-04-13 | 2015-07-01 | 中钢集团吉林机电设备有限公司 | Material distributing method for sintering of chromite fine powder pellets |
| WO2017063250A1 (en) * | 2015-10-14 | 2017-04-20 | 福建鼎信实业有限公司 | Production method for hot-delivering oxidized pellets in shaft furnace to sealed ferrochrome electric furnace |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 孙竞;: "南非粉铬矿球团烧结工艺与技术装备简述", 铁合金, no. 03, pages 4 - 7 * |
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Application publication date: 20221011 |
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