CN105439417A - Red mud sulfur-fixing method - Google Patents

Red mud sulfur-fixing method Download PDF

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Publication number
CN105439417A
CN105439417A CN201510796301.4A CN201510796301A CN105439417A CN 105439417 A CN105439417 A CN 105439417A CN 201510796301 A CN201510796301 A CN 201510796301A CN 105439417 A CN105439417 A CN 105439417A
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CN
China
Prior art keywords
red mud
sulfur
cao
calcination
metal salts
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Pending
Application number
CN201510796301.4A
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Chinese (zh)
Inventor
丁绍兰
王明
谢林花
董凌霄
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Shaanxi University of Science and Technology
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Shaanxi University of Science and Technology
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Application filed by Shaanxi University of Science and Technology filed Critical Shaanxi University of Science and Technology
Priority to CN201510796301.4A priority Critical patent/CN105439417A/en
Publication of CN105439417A publication Critical patent/CN105439417A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention discloses a red mud sulfur-fixing method. According to the red mud sulfur-fixing method, after a sulfur-fixing agent CaO and a metal salt additive are sequentially added into red mud, the red mud is fired in an electric tube furnace, thereby achieving a sulfur fixing effect; CaO is taken as the sulfur-fixing agent and is supplemented with the metal salt additive, and sulfur in the red mud is fixed under a firing condition, so that the process is simple, and the processing effect is good, and the environmental hazard caused when SO2 is dissipated in air in resource utilization ways for preparing ceramic materials by roasting the red mud is reduced.

Description

A kind of solid sulphur method of red mud
Technical field
The invention belongs to red mud resource treatment technique field, be specifically related to a kind of solid sulphur method of red mud.
Background technology
Red mud is the waste material of aluminum smelting industry, because wherein containing Fe 2o 3, so take on a red color, and called after red mud.Owing to containing a large amount of non-metallic elements in bauxite as S, N, O, P etc., metallic element, as Fe, Ca, Si, Ti etc., also contains a small amount of actinium series lanthanon as Th, U simultaneously, adds a large amount of outputs of red mud, make its treatment and disposal just become particularly difficulty.
Red mud is applied to material of construction, and consider in red mud to also have a certain amount of S, preparing in material of construction process, S can with SO 2form overflow, not only compromise the healthy of staff, also can pollute local air ambient.So being necessary to the process of S in red mud, is also to the large power-assisted of red mud resource utilization pretreated.
Summary of the invention
The object of this invention is to provide a kind of solid sulphur method of red mud, solve red mud and preparing in material of construction process, S can with SO 2form overflow, not only compromise the healthy of staff, also can pollute the problem of local air ambient.
The technical solution adopted in the present invention is, a kind of solid sulphur method of red mud, add sulphur-fixing agent CaO and Metal Salts successively in red mud after in electric tube furnace calcination to reach the object of solid sulphur.
Feature of the present invention is also,
Specifically implement according to following steps:
Step 1, adds sulphur-fixing agent CaO and Metal Salts in red mud, mixes rear for subsequent use;
Step 2, is placed in porcelain boat by the mixture obtained in step 1, is placed in electric tube furnace calcination when passing into air, absorbs the gas of calcination generation with the liquor kalii iodide of Potassium Iodate.
In step 1, the addition of CaO is red mud quality 0.1 ~ 0.5%, and the addition of metal additive is red mud quality 0.1 ~ 0.5%.
In step 1, metal additive is: Na 2cO 3, MgO, SiO 2, Al 2o 3or Ba (NO 3) 2in one.
In step 2, air flow quantity is 0.1 ~ 0.5m 3/ h, mixture is with 5 DEG C/min ramp to 500 ~ 1000 DEG C from room temperature, and calcination time is 20min ~ 25min.
The invention has the beneficial effects as follows, the solid sulphur method of red mud of the present invention, adopts CaO as sulphur-fixing agent, be aided with Metal Salts, under the condition of calcination, fix the sulphur in red mud, technique is simple, treatment effect is good, this method reduces when the utilization of resources approach such as stupalith being prepared by red mud roasting because of SO 2dissipate in air the harm caused environment.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
The solid sulphur method of a kind of red mud of the present invention, add sulphur-fixing agent CaO and Metal Salts successively in red mud after in electric tube furnace calcination to reach the object of solid sulphur.
Specifically implement according to following steps:
Step 1, adds sulphur-fixing agent CaO and Metal Salts in red mud, and the addition of CaO is red mud quality 0.1 ~ 0.5%, and the addition of Metal Salts is red mud quality 0.1 ~ 0.5%, mixes rear for subsequent use;
Metal Salts is: Na 2cO 3, MgO, SiO 2, Al 2o 3or Ba (NO 3) 2in one;
Step 2, is placed in porcelain boat by the mixture obtained in step 1, and when passing into air, (flow is 0.1 ~ 0.5m 3/ h) be placed in electric tube furnace with 5 DEG C/min ramp to 500 ~ 1000 DEG C calcination 20min ~ 25min from room temperature, the gas of calcination generation is absorbed with the liquor kalii iodide of Potassium Iodate.
In the solid sulphur method of red mud of the present invention, be sulphur-fixing agent with CaO, the S in red mud forms SO in calcination process 2, SO 2caSO is generated with CaO reaction 4, CaSO 4poor heat stability, can decompose under hot conditions, SO 2can again overflow.Add Metal Salts and can well promote CaSO 4thermostability, make red mud still show good captured sulfur result under the high temperature conditions, the inventive method sulfur-fixing rate reaches.
Embodiment 1
Step 1, adds sulphur-fixing agent CaO and MgO in red mud, and the addition of CaO is the addition of red mud quality 0.1%, MgO is red mud quality 0.2%, mixes rear for subsequent use;
Step 2, is placed in porcelain boat by the mixture obtained in step 1, and when passing into air, (flow is 0.1m 3/ h) be placed in electric tube furnace with 5 DEG C/min ramp to 500 DEG C calcination 20min from room temperature, the gas of calcination generation is absorbed with the liquor kalii iodide of Potassium Iodate.
After embodiment 1 processes, sulfur-fixing rate is 76.85%.
Embodiment 2
Step 1, adds sulphur-fixing agent CaO and Na in red mud 2cO 3, the addition of CaO is red mud quality 0.2%, Na 2cO 3addition be red mud quality 0.3%, mix rear for subsequent use;
Step 2, is placed in porcelain boat by the mixture obtained in step 1, and when passing into air, (flow is 0.3m 3/ h) be placed in electric tube furnace with 5 DEG C/min ramp to 1000 DEG C calcination 21min from room temperature, the gas of calcination generation is absorbed with the liquor kalii iodide of Potassium Iodate.
After embodiment 2 processes, sulfur-fixing rate is 64.55%.
Embodiment 3
Step 1, adds sulphur-fixing agent CaO and SiO in red mud 2, the addition of CaO is red mud quality 0.3%, SiO 2addition be red mud quality 0.5%, mix rear for subsequent use;
Step 2, is placed in porcelain boat by the mixture obtained in step 1, and when passing into air, (flow is 0.4m 3/ h) be placed in electric tube furnace with 5 DEG C/min ramp to 700 DEG C calcination 25min from room temperature, the gas of calcination generation is absorbed with the liquor kalii iodide of Potassium Iodate.
After embodiment 3 processes, sulfur-fixing rate is 79.85%.
Embodiment 4
Step 1, adds sulphur-fixing agent CaO and Al in red mud 2o 3, the addition of CaO is red mud quality 0.4%, Al 2o 3addition be red mud quality 0.1%, mix rear for subsequent use;
Step 2, is placed in porcelain boat by the mixture obtained in step 1, and when passing into air, (flow is 0.2m 3/ h) be placed in electric tube furnace with 5 DEG C/min ramp to 800 DEG C calcination 23min from room temperature, the gas of calcination generation is absorbed with the liquor kalii iodide of Potassium Iodate.
After embodiment 4 processes, sulfur-fixing rate is 71.76%.
Embodiment 5
Step 1, adds sulphur-fixing agent CaO and Ba (NO in red mud 3) 2, the addition of CaO is red mud quality 0.5%, Ba (NO 3) 2addition be red mud quality 0.4%, mix rear for subsequent use;
Step 2, is placed in porcelain boat by the mixture obtained in step 1, and when passing into air, (flow is 0.5m 3/ h) be placed in electric tube furnace with 5 DEG C/min ramp to 600 DEG C calcination 24min from room temperature, the gas of calcination generation is absorbed with the liquor kalii iodide of Potassium Iodate.
After embodiment 5 processes, sulfur-fixing rate is 80.66%.

Claims (5)

1. the solid sulphur method of red mud, is characterized in that, add sulphur-fixing agent CaO and Metal Salts successively in red mud after in electric tube furnace calcination to reach the object of solid sulphur.
2. the solid sulphur method of red mud according to claim 1, is characterized in that, specifically implement according to following steps:
Step 1, adds sulphur-fixing agent CaO and Metal Salts in red mud, mixes rear for subsequent use;
Step 2, is placed in porcelain boat by the mixture obtained in step 1, is placed in electric tube furnace calcination when passing into air, absorbs the gas of calcination generation with the liquor kalii iodide of Potassium Iodate.
3. the solid sulphur method of red mud according to claim 2, it is characterized in that, in step 1, the addition of CaO is red mud quality 0.1 ~ 0.5%, and the addition of Metal Salts is red mud quality 0.1 ~ 0.5%.
4. the solid sulphur method of red mud according to claim 2, it is characterized in that, in step 1, Metal Salts is: Na 2cO 3, MgO, SiO 2, Al 2o 3or Ba (NO 3) 2in one.
5. the solid sulphur method of the red mud according to claim 2 or 4, it is characterized in that, in step 2, air flow quantity is 0.1 ~ 0.5m 3/ h, mixture is with 5 DEG C/min ramp to 500 ~ 1000 DEG C from room temperature, and calcination time is 20min ~ 25min.
CN201510796301.4A 2015-11-18 2015-11-18 Red mud sulfur-fixing method Pending CN105439417A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510796301.4A CN105439417A (en) 2015-11-18 2015-11-18 Red mud sulfur-fixing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510796301.4A CN105439417A (en) 2015-11-18 2015-11-18 Red mud sulfur-fixing method

Publications (1)

Publication Number Publication Date
CN105439417A true CN105439417A (en) 2016-03-30

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1699526A (en) * 2005-06-13 2005-11-23 华中科技大学 Coal combustion and sulfur fixation composite additives
CN101480568A (en) * 2008-12-29 2009-07-15 中国铝业股份有限公司 Red mud sulphur-fixing agent and fuel coal sulphur-fixing method using red mud
CN101899353A (en) * 2010-08-31 2010-12-01 重庆南桐矿业有限责任公司南桐选煤厂 High-temperature fixed sulfur additive and preparation method thereof
KR20120033073A (en) * 2010-09-29 2012-04-06 현대제철 주식회사 Desulphurizing agent made from by-product of lime cacination and manufacturing method thereof and method for desulphurizing flue gas using it

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1699526A (en) * 2005-06-13 2005-11-23 华中科技大学 Coal combustion and sulfur fixation composite additives
CN101480568A (en) * 2008-12-29 2009-07-15 中国铝业股份有限公司 Red mud sulphur-fixing agent and fuel coal sulphur-fixing method using red mud
CN101899353A (en) * 2010-08-31 2010-12-01 重庆南桐矿业有限责任公司南桐选煤厂 High-temperature fixed sulfur additive and preparation method thereof
KR20120033073A (en) * 2010-09-29 2012-04-06 현대제철 주식회사 Desulphurizing agent made from by-product of lime cacination and manufacturing method thereof and method for desulphurizing flue gas using it

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Application publication date: 20160330