CN102134639A - Method for roasting high-sulfur high-arsenic limonite at high temperature in rotary kiln - Google Patents
Method for roasting high-sulfur high-arsenic limonite at high temperature in rotary kiln Download PDFInfo
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- CN102134639A CN102134639A CN 201110060647 CN201110060647A CN102134639A CN 102134639 A CN102134639 A CN 102134639A CN 201110060647 CN201110060647 CN 201110060647 CN 201110060647 A CN201110060647 A CN 201110060647A CN 102134639 A CN102134639 A CN 102134639A
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- rotary kiln
- limonite
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- sulfur
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Abstract
The invention belongs to the technical field of metallurgy, and in particular relates to a method for treating high-sulfur high-arsenic limonite (magnetic separated slag and sulfur acid residue). The method is characterized by comprising the following steps of: mixing anthracite duff serving as a reducing agent with a limonite raw material, introducing into the rotary kiln for roasting reaction, controlling the temperature of a preheating section of the rotary kiln to be between 300 and 1,100DEG C and gradually rise along with the movement of charging materials, controlling the temperature of a burning zone to be between 200 and 1,500DEG C, and controlling the discharging temperature to be between 1,100 and 1,300DEG C. The method has the advantages of simple process, good treatment effect and high efficiency of removing sulfur and arsenic; and the product has high grade, and can be directly used as a blast furnace ironmaking raw material without being subjected to magnetic separation.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to the treatment process of a kind of high-sulfur, high arsenic limonite (magnetic separation slag, sulfate slag).
Background technology
Some regional limonite (magnetic separation slag, sulfate slag) ferrous grade hangs down 40～50% in, and sulfur-bearing (about 2%), phosphorus, arsenic impurity such as (about 2%) is more, physical concentration is difficulty, and when adopting traditional rotary kiln reduction magnetizing roasting, because of burning zone temperature in the kiln is controlled at about 850 ℃, product after roasting, ferrous grade is low, effect of removing arsenic is relatively poor, and product must could use as blast furnace raw material through after the magnetic separation, more can't handle, so prior art is to limonite (magnetic separation slag to high arsenic raw material, sulfate slag) treatment process is complicated, and effect is relatively poor.
Summary of the invention
The purpose of this invention is to provide a kind of rotary kiln high-temperature roasting high-sulfur, high arsenic limonite (magnetic separation slag, sulfate slag) method, its technology is simple, and treatment effect is good, deviates from the efficient height of sulphur and arsenic, the product grade height of output can be without magnetic separation directly as blast furnace ironmaking raw material.
Solving the scheme that technical problem of the present invention adopts is: with pulverized anthracite as reductive agent, with send into the reaction of revolution roasting in kilns after limonite (or high-sulfur, the magnetic separation slag of high arsenic, sulfate slag) raw material mixes, revolution preheating section of kiln temperature is controlled at 300～1100 ℃ of scopes and moves rising gradually with furnace charge, burning zone temperature is controlled to be 1200～1500 ℃, and drop temperature is controlled at 1100～1300 ℃.
Fixed carbon content is 65～75wt% in described reductive agent pulverized anthracite, and granularity is 1～10 millimeter, accounts for 3～5wt% of charge composition, and the velocity of rotation of kiln is 1～2 rev/min, and furnace charge is 65～85 minutes at kiln residence time.
The discharging of rotary kiln is adopted into water quick cooling, the high-temperature gas that the kiln internal reaction produces take out to preheating section of kiln and with the solid charge inverse motion; During for coal gas heating rotary kiln shortage of heat, adopt from kiln tail adding hard coal and replenish as the energy.
Working process of the present invention and principle are: limonite is (850～900 ℃) after being heated to certain temperature, act on mutually with an amount of reductive agent, just can make the rhombohedral iron ore of weak magnetic change ferromagnetic magnetite (Fe into
3O
4).
Limonite magnetizing roasting chemical equation is as follows:
2Fe
2O
3．3Ｈ
2Ｏ
2Fe
2O
3 ＋3Ｈ
2Ｏ
Limonite begins dehydration under 300-400 ℃, become rhombohedral iron ore after the dehydration.
Rhombohedral iron ore and reductive agent chemical reaction are as follows: (850～900 ℃ of temperature of reaction)
3Fe
2O
3 +?C → 2Fe
3O
4 +?CO
3Fe
2O
3 +?CO → 2Fe
3O
4 +?CO
2
3Fe
2O
3 +?H
2 → 2Fe
3O
4 +?H
2O?。
The invention has the beneficial effects as follows: the method for traditional rotary kiln baking limonite (magnetic separation slag, sulfate slag) is owing to adopt the interior burning zone temperature of kiln to be controlled at about 850 ℃ always, though temperature of reaction is than sulphur, arsenic material decomposition and be oxidized to gasiform theoretical temperatures height, but a lot of sulphur, arsenic material still can be mingled with and enter in the magnetite product, clearance only reaches about 10%, also needs in conjunction with the magnetization operation after the roasting.The present invention is through summing up, adopted in the preheating section temperature and moved the high low temperature combined techniques that rises gradually with furnace charge, and burning zone temperature is also far above original temperature, so desulfurization, arsenic removal becomes and is more prone to, make the finished product iron content (based on Z 250, it is ferrous to contain partial oxidation) grade is 59～61%, sulfur-bearing 0.02%-0.05%, contain about arsenic 0.01%-0.05%, finished product can be directly as blast furnace ironmaking raw material, the rate of recovery (butt) is about 75%, and can save original magnetic separation operation (also can through obtaining the smart powder of the iron of grade about 65% after the magnetic separation again).
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Embodiment 1: the rotary kiln that adopts Φ 3.3 * 60, with granularity is that the pulverized anthracite of 1～10mm is as reductive agent, fixed carbon content is 70wt% in the pulverized anthracite, about ash content 20%, pulverized anthracite accounts for 3 wt% of charge composition, with high-sulfur high-arsenic raw material (iron content: 50%, sulphur: 2%, arsenic: 1.8%) stir after, 22 tons/hour of total feedings are sent into kiln tail pan feeding through rubber conveyer, rotary kiln body inclination angle 4%, the kiln speed control is built in 1.2 rev/mins, and furnace charge moves to kiln hood gradually in the rotary kiln rotation process.Revolution preheating section of kiln temperature is controlled at 300～1100 ℃ of scopes and moves rising gradually with furnace charge, and burning zone temperature is controlled to be 1200～1500 ℃, and drop temperature is controlled at 1100～1300 ℃.The rotary kiln endogenous pyrogen is produced by coal gas, when coal gas produces heat and can not satisfy in the kiln material reaction institute heat requirement, adds suitable coal dust in order to replenish the kiln endogenous pyrogen by the kiln tail.The high-temperature gas that produces is taken out the preheating section to the kiln tail, and hot gas flow and solid charge inverse motion heat gradually to the furnace charge that enters, and furnace charge is about 75 minutes at kiln residence time.Finished product iron content (based on Z 250, it is ferrous to contain partial oxidation) grade is 60%, sulfur-bearing 0.02%, contains arsenic 0.025%.
Embodiment 2: the rotary kiln that adopts Φ 3.3 * 60, with granularity is that the pulverized anthracite of 1～10mm is as reductive agent, fixed carbon content is 75wt% in the pulverized anthracite, about ash content 18%, pulverized anthracite accounts for 4.5 wt% of charge composition, with high-sulfur high-arsenic raw material (iron content: 50%, sulphur: 2.5%, arsenic: 2.2%) stir after, 26 tons/hour of total feedings are sent into kiln tail pan feeding through rubber conveyer, rotary kiln body inclination angle 4%, the kiln speed control is built in 1.4 rev/mins, and furnace charge moves to kiln hood gradually in the rotary kiln rotation process.Revolution preheating section of kiln temperature is controlled at 300～1100 ℃ of scopes and moves rising gradually with furnace charge, and burning zone temperature is controlled to be 1200～1500 ℃, and drop temperature is controlled at 1100～1300 ℃.The rotary kiln endogenous pyrogen is produced by coal gas, when coal gas produces heat and can not satisfy in the kiln material reaction institute heat requirement, adds suitable coal dust in order to replenish the kiln endogenous pyrogen by the kiln tail.The high-temperature gas that produces is taken out the preheating section to the kiln tail, and hot gas flow and solid charge inverse motion heat gradually to the furnace charge that enters, and furnace charge is about 65 minutes at kiln residence time.Finished product iron content (based on Z 250, it is ferrous to contain partial oxidation) grade is 59.2%, sulfur-bearing 0.032%, contains arsenic 0.04%.
Embodiment 3: embodiment 2: the rotary kiln that adopts Φ 3.6 * 60, with granularity is that the pulverized anthracite of 1～10mm is as reductive agent, fixed carbon content is 70wt% in the pulverized anthracite, about ash content 20%, pulverized anthracite accounts for 5 wt% of charge composition, with high-sulfur high-arsenic raw material (iron content: 50%, sulphur: 2.0%, arsenic: 2.0%) stir after, 28 tons/hour of total feedings are sent into kiln tail pan feeding through rubber conveyer, rotary kiln body inclination angle 3.5%, the kiln speed control is built in 1.5 rev/mins, and furnace charge moves to kiln hood gradually in the rotary kiln rotation process.Revolution preheating section of kiln temperature is controlled at 300～1100 ℃ of scopes and moves rising gradually with furnace charge, and burning zone temperature is controlled to be 1200～1500 ℃, and drop temperature is controlled at 1100～1300 ℃.The rotary kiln endogenous pyrogen is produced by coal gas, when coal gas produces heat and can not satisfy in the kiln material reaction institute heat requirement, adds suitable coal dust in order to replenish the kiln endogenous pyrogen by the kiln tail.The high-temperature gas that produces is taken out the preheating section to the kiln tail, and hot gas flow and solid charge inverse motion heat gradually to the furnace charge that enters, and furnace charge is about 70 minutes at kiln residence time.Finished product iron content (based on Z 250, it is ferrous to contain partial oxidation) grade is 59%, sulfur-bearing 0.038%, contains arsenic 0.046%.
Claims (3)
1. the method for a rotary kiln baking high-sulfur, high arsenic limonite, it is characterized in that: with pulverized anthracite as reductive agent, with send into the reaction of revolution roasting in kilns after the limonite raw material mixes, revolution preheating section of kiln temperature is controlled at 300～1100 ℃ of scopes and moves rising gradually with furnace charge, burning zone temperature is controlled to be 1200～1500 ℃, and drop temperature is controlled at 1100～1300 ℃.
2. press the method for the described rotary kiln baking high-sulfur of claim 1, high arsenic limonite, it is characterized in that: the fixed carbon content of pulverized anthracite is 65～75wt%, granularity is 1～10 millimeter, account for 3～5wt% of charge composition, the velocity of rotation of kiln is 1～2 rev/min, and furnace charge is 65～85 minutes at kiln residence time.
3. by the method for the described rotary kiln baking high-sulfur of claim 2, high arsenic limonite, it is characterized in that: the rotary kiln discharging is adopted into water quick cooling, the high-temperature gas that the kiln internal reaction produces take out to preheating section of kiln and with the solid charge inverse motion; During for coal gas heating rotary kiln shortage of heat, adopt from kiln tail adding hard coal and replenish as the energy; The specification of rotary kiln is selected Φ 3.3m * 60m for use.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534188A (en) * | 2012-01-20 | 2012-07-04 | 个旧市富祥工贸有限责任公司 | Method for producing iron pellet with sulfur acid residue containing large contents of impurities and enriching valuable metal |
| CN114804186A (en) * | 2022-05-16 | 2022-07-29 | 吴江市威士达铜业科技有限公司 | Production method and production device of copper oxide |
| CN115198114A (en) * | 2022-08-17 | 2022-10-18 | 中冶长天国际工程有限责任公司 | System for recovering elemental arsenic from copper smelting soot and using method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914674A (en) * | 2010-08-11 | 2010-12-15 | 山东华恒矿业有限公司 | Process for high-temperature roasting high-sulfur high-arsenic limonite in rotary kiln |
-
2011
- 2011-03-14 CN CN 201110060647 patent/CN102134639A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914674A (en) * | 2010-08-11 | 2010-12-15 | 山东华恒矿业有限公司 | Process for high-temperature roasting high-sulfur high-arsenic limonite in rotary kiln |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534188A (en) * | 2012-01-20 | 2012-07-04 | 个旧市富祥工贸有限责任公司 | Method for producing iron pellet with sulfur acid residue containing large contents of impurities and enriching valuable metal |
| CN114804186A (en) * | 2022-05-16 | 2022-07-29 | 吴江市威士达铜业科技有限公司 | Production method and production device of copper oxide |
| CN115198114A (en) * | 2022-08-17 | 2022-10-18 | 中冶长天国际工程有限责任公司 | System for recovering elemental arsenic from copper smelting soot and using method thereof |
| CN115198114B (en) * | 2022-08-17 | 2024-02-13 | 中冶长天国际工程有限责任公司 | System for recycling simple substance arsenic from copper smelting ash and application method thereof |
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Application publication date: 20110727 |