CN103864130A - Method for production of gypsum and co-production of powdered iron by use of ferrous sulfate - Google Patents
Method for production of gypsum and co-production of powdered iron by use of ferrous sulfate Download PDFInfo
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- CN103864130A CN103864130A CN201410118350.8A CN201410118350A CN103864130A CN 103864130 A CN103864130 A CN 103864130A CN 201410118350 A CN201410118350 A CN 201410118350A CN 103864130 A CN103864130 A CN 103864130A
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- ferrous sulfate
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Abstract
The invention discloses a method for production of gypsum and co-production of powdered iron by use of ferrous sulfate. As a side product of titanium dioxide, namely iron vitriol is put into a rotary kiln, dried and dehydrated to prepare ferrous sulfate and then coal cinders are ground into coal powder and sprayed into the rotary kiln; the ferrous sulfate and the coal powder are roasted in the rotary kiln for 24-36 hours at the heating temperature of 850-1000 DEG C; after the roasting is finished, hot cinders in the rotary kiln are cooled by a cooler to obtain iron ore concentrate, the gas SO3 passes through a dust-removing cooling device and a purification cooling device and subsequently enters an oxidation absorption tower to be prepared into sulfuric acid; and the prepared sulfuric acid is put into a neutralizing tank and then lime is added into the neutralizing tank for neutralization so as to obtain the gypsum. As the side product generated in production of the titanium dioxide, namely the ferrous sulfate is used as a main raw material for producing the iron ore concentrate, the production cost is low, iron content is high, more than 70% of the side product is calcium sulfate, the content of Fe is over 60%, the investment on the equipment for producing the iron ore concentrate by using the ferrous sulfate is low, the construction period is short, and the effect is achieved rapidly.
Description
Technical field
The invention belongs to chemical production technical field, be specifically related to a kind of method of ferrous sulfate production gypsum coproduction iron fine powder.
Background technology
Along with the high speed development of China's economy and Iron And Steel Industry, to the demand rapid growth of iron ore concentrate, China's iron ore ubiquity that lean ore is many, rich ore is few, iron ore ferrous grade low (mean F e33% left and right) many metals symbiotic iron ore ratio is high, iron ore component complexity, the poor iron ore ratio of China is up to 97% left and right, most iron ores just can be utilized after must processing by ore dressing, and therefore recent year iron ore concentrate is always in the situation that supply falls short of demand.Iron ore concentrate import volume increases year by year, and price goes up year by year.Low in order to solve the degree of protection of China's iron ore deposit, the iron ore degree of self-sufficiency is low, externally interdependent increasing year by year and the internally imbalance between supply and demand of iron ore concentrate, must be by the regeneration of strengthening the exploitation of domestic iron ore deposit and excavating again the resources of production, for China's Energy-saving of Iron And Steel Industry consumption reduction, increase economic efficiency and make an effort.
Titanium dioxide is a kind of high-grade white pigment, along with economic development, the demand of titanium dioxide is increased day by day.At present, China mainly adopts Titanium White Production By Sulfuric Acid Process, and 1 ton of titanium dioxide of every production approximately produces 4 tons of iron vitriol byproducts, its output very huge (annual about millions of tons).If adopt stacking mode, required place scale requires greatly, and ferrous sulfate is soluble in water, flows into water source environment is impacted after dissolving, and has wasted ready-made iron resources simultaneously.Although, also there is small part iron vitriol for agricultural chemicals, fertilizer, feed, water treatment etc., still have very major part not yet to find so far and rationally effectively utilize approach.Therefore, how processing these byproducts becomes titanium dioxide industry problem demanding prompt solution, has seriously restricted the development of related industries.
Summary of the invention
Technical problem to be solved by this invention is that supply falls short of demand and realize the problem that ferrous sulfate is extensive, high-level efficiency is utilized for domestic iron ore concentrate, and provide a kind of ferrous sulfate to produce the method for gypsum coproduction iron fine powder, facility investment is few, and the construction period is short, instant effect.
For solving the problems of the technologies described above, the present invention by the following technical solutions: ferrous sulfate of the present invention is produced the method for gypsum coproduction iron fine powder, it is characterized in that comprising the following steps:
(1) add dry dewatering in rotary kiln to make ferrous sulfate iron vitriol, then cinder is worn into coal dust and spray in rotary kiln;
(2) ferrous sulfate and coal dust are at revolution roasting in kilns, and Heating temperature is 850 ~ 1000 DEG C, roasting time 24 ~ 36h;
(3), after roasting finishes, the hot slag in rotary kiln obtains iron ore concentrate after water cooler is cooling, gas SO
3after dedusting cooling apparatus, purification cooling apparatus, enter oxidation absorption tower, make sulfuric acid;
(4) sulfuric acid step (3) being made is placed in neutralization tank, then adds lime neutralization to obtain gypsum in neutralization tank.
In described step (1), iron vitriol adds dry dewatering in rotary kiln, and temperature is 200 ~ 300 DEG C, dry 12 ~ 24h.
In described step (1), spraying into the amount of coal dust in rotary kiln is 1/15 ~ 1/10 of iron vitriol.
In described step (3), dedusting cooling apparatus comprises one-level tornado dust collector and one-level electric precipitator, SO after dedusting
3temperature be down to 250 ~ 350 DEG C.
In described step (3), purifying cooling apparatus is electric separator, SO after electric separator
3temperature be down to 80 ~ 25 DEG C.
Producing iron ore concentrate main raw material used is ferrous sulfate, produce the ferrous sulfate content of titanium dioxide by-product more than 95%, every physical and chemical index meets the requirements, do not need any processing, can directly use, suitably increase roasting time, ferrous sulfate is decomposed more abundant, the iron fine powder iron level obtaining is higher, the gas producing enters oxidation absorption tower through twice dedusting cooling and purifying, absorb into sulfuric acid through circulation, add in lime and after obtain gypsum and can make by-product sale, increase the added value of technique, improve economic benefit, this flow process is without waste water and gas, waste sludge discharge, can reach environmental requirement, water power can be secure an adequate supply, quality is controlled by laboratory, so every environmental protection of technique is all secure.
Beneficial effect of the present invention: adopt ferrous sulfate to produce iron ore concentrate, production cost is low, and iron-holder is high, has market competition potentiality, and the above calcium sulfate of by-product 70% is pollution-free, above these provide extremely beneficial condition for iron ore concentrate project.The ferrous sulfate of producing titanium dioxide by-product is main raw material(s), through dehydration, preheating, roasting, the cooling iron ore concentrate that is, Fe content reaches more than 60%, adopt the facility investment of ferrous sulfate production iron ore concentrate few, construction period is short, instant effect, raw materials can be gathered materials on the spot, and also for producer has solved the problem of environmental pollution that ferrous sulfate is stacked.
Brief description of the drawings
Fig. 1 is the schematic flow sheet that ferrous sulfate of the present invention is produced gypsum coproduction iron fine powder.
Embodiment
Embodiment 1
The ferrous sulfate of the present embodiment is produced the method for gypsum coproduction iron fine powder, comprises the following steps:
(1) add dry dewatering in rotary kiln to make ferrous sulfate the by product iron vitriol of titanium dioxide, temperature is 200 ~ 300 DEG C, dry 12 ~ 24h, then wears into coal dust cinder and sprays in rotary kiln, and the amount of coal dust in rotary kiln that sprays into is 1/15 ~ 1/10 of iron vitriol;
(2) ferrous sulfate and coal dust are at revolution roasting in kilns, and Heating temperature is 850 ~ 1000 DEG C, roasting time 24 ~ 36h;
(3), after roasting finishes, the hot slag in rotary kiln obtains iron ore concentrate after water cooler is cooling, gas SO
3sO after one-level tornado dust collector and the dedusting of one-level electric precipitator
3temperature be down to 250 ~ 350 DEG C, then enter electric separator after temperature be down to 80 ~ 25 DEG C, last SO
3enter oxidation absorption tower, make sulfuric acid;
(4) sulfuric acid step (3) being made is placed in neutralization tank, then adds lime neutralization to obtain gypsum in neutralization tank.
Embodiment 2
The ferrous sulfate of the present embodiment is produced the method for gypsum coproduction iron fine powder, comprises the following steps:
(1) add dry dewatering in rotary kiln to make ferrous sulfate the by product iron vitriol of titanium dioxide, temperature is 200 DEG C, and dry 12h, then wears into coal dust cinder and spray in rotary kiln, and the amount of coal dust in rotary kiln that sprays into is 1/15 of iron vitriol;
(2) ferrous sulfate and coal dust are at revolution roasting in kilns, and Heating temperature is 850 DEG C, roasting time 24h;
(3), after roasting finishes, the hot slag in rotary kiln obtains iron ore concentrate after water cooler is cooling, gas SO
3sO after one-level tornado dust collector and the dedusting of one-level electric precipitator
3temperature be down to 250 DEG C, then enter electric separator after temperature be down to 80 DEG C, last SO
3enter oxidation absorption tower, make sulfuric acid;
(4) sulfuric acid step (3) being made is placed in neutralization tank, then adds lime neutralization to obtain gypsum in neutralization tank.
Embodiment 3
The ferrous sulfate of the present embodiment is produced the method for gypsum coproduction iron fine powder, comprises the following steps:
(1) add dry dewatering in rotary kiln to make ferrous sulfate the by product iron vitriol of titanium dioxide, temperature is 300 DEG C, and dry 24h, then wears into coal dust cinder and spray in rotary kiln, and the amount of coal dust in rotary kiln that sprays into is 1/10 of iron vitriol;
(2) ferrous sulfate and coal dust are at revolution roasting in kilns, and Heating temperature is 1000 DEG C, roasting time 36h;
(3), after roasting finishes, the hot slag in rotary kiln obtains iron ore concentrate after water cooler is cooling, gas SO
3sO after one-level tornado dust collector and the dedusting of one-level electric precipitator
3temperature be down to 350 DEG C, then enter electric separator after temperature be down to 25 DEG C, last SO
3enter oxidation absorption tower, make sulfuric acid;
(4) sulfuric acid step (3) being made is placed in neutralization tank, then adds lime neutralization to obtain gypsum in neutralization tank.
Embodiment 4
The ferrous sulfate of the present embodiment is produced the method for gypsum coproduction iron fine powder, comprises the following steps:
(1) add dry dewatering in rotary kiln to make ferrous sulfate the by product iron vitriol of titanium dioxide, temperature is 250 DEG C, and dry 20h, then wears into coal dust cinder and spray in rotary kiln, and the amount of coal dust in rotary kiln that sprays into is 1/12 of iron vitriol;
(2) ferrous sulfate and coal dust are at revolution roasting in kilns, and Heating temperature is 950 DEG C, roasting time 30h;
(3), after roasting finishes, the hot slag in rotary kiln obtains iron ore concentrate after water cooler is cooling, gas SO
3sO after one-level tornado dust collector and the dedusting of one-level electric precipitator
3temperature be down to 300 DEG C, then enter electric separator after temperature be down to 30 DEG C, last SO
3enter oxidation absorption tower, make sulfuric acid;
(4) sulfuric acid step (3) being made is placed in neutralization tank, then adds lime neutralization to obtain gypsum in neutralization tank.
Claims (5)
1. ferrous sulfate is produced a method for gypsum coproduction iron fine powder, it is characterized in that comprising the following steps:
(1) add dry dewatering in rotary kiln to make ferrous sulfate iron vitriol, then cinder is worn into coal dust and spray in rotary kiln;
(2) ferrous sulfate and coal dust are at revolution roasting in kilns, and Heating temperature is 850 ~ 1000 DEG C, roasting time 24 ~ 36h;
(3), after roasting finishes, the hot slag in rotary kiln obtains iron ore concentrate after water cooler is cooling, gas SO
3after dedusting cooling apparatus, purification cooling apparatus, enter oxidation absorption tower, make sulfuric acid;
(4) sulfuric acid step (3) being made is placed in neutralization tank, then adds lime neutralization to obtain gypsum in neutralization tank.
2. ferrous sulfate according to claim 1 is produced the method for gypsum coproduction iron fine powder, it is characterized in that: in described step (1), iron vitriol adds dry dewatering in rotary kiln, and temperature is 200 ~ 300 DEG C, dry 12 ~ 24h.
3. ferrous sulfate according to claim 1 is produced the method for gypsum coproduction iron fine powder, it is characterized in that: the amount of coal dust in rotary kiln that sprays in described step (1) is 1/15 ~ 1/10 of iron vitriol.
4. ferrous sulfate according to claim 1 is produced the method for gypsum coproduction iron fine powder, it is characterized in that: in described step (3), dedusting cooling apparatus comprises one-level tornado dust collector and one-level electric precipitator, SO after dedusting
3temperature be down to 250 ~ 350 DEG C.
5. ferrous sulfate according to claim 1 is produced the method for gypsum coproduction iron fine powder, it is characterized in that: in described step (3), purifying cooling apparatus is electric separator, SO after electric separator
3temperature be down to 80 ~ 25 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410118350.8A CN103864130A (en) | 2014-03-27 | 2014-03-27 | Method for production of gypsum and co-production of powdered iron by use of ferrous sulfate |
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| CN201410118350.8A CN103864130A (en) | 2014-03-27 | 2014-03-27 | Method for production of gypsum and co-production of powdered iron by use of ferrous sulfate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109593953A (en) * | 2018-12-20 | 2019-04-09 | 张家港宏昌钢板有限公司 | The method that semi-dry desulphurization ash cooperates with resource utilization with titanium white by product green vitriol |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2032902A (en) * | 1978-10-04 | 1980-05-14 | Thann & Mulhouse | Process for the preparation of pigment grade iron oxides from ferrous sulphate and the resulting fe2o3 pigments |
| CN1994868A (en) * | 2006-12-30 | 2007-07-11 | 昆明理工大学 | Method for producing vitriol and iron ore concentrate using ferrous sulfate |
| CN102344123A (en) * | 2011-07-12 | 2012-02-08 | 湖南恒光科技股份有限公司 | Sulfuric acid and fine iron powder co-production method using iron vitriol |
-
2014
- 2014-03-27 CN CN201410118350.8A patent/CN103864130A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2032902A (en) * | 1978-10-04 | 1980-05-14 | Thann & Mulhouse | Process for the preparation of pigment grade iron oxides from ferrous sulphate and the resulting fe2o3 pigments |
| CN1994868A (en) * | 2006-12-30 | 2007-07-11 | 昆明理工大学 | Method for producing vitriol and iron ore concentrate using ferrous sulfate |
| CN102344123A (en) * | 2011-07-12 | 2012-02-08 | 湖南恒光科技股份有限公司 | Sulfuric acid and fine iron powder co-production method using iron vitriol |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109593953A (en) * | 2018-12-20 | 2019-04-09 | 张家港宏昌钢板有限公司 | The method that semi-dry desulphurization ash cooperates with resource utilization with titanium white by product green vitriol |
| CN109593953B (en) * | 2018-12-20 | 2021-02-12 | 张家港宏昌钢板有限公司 | Method for synergistic resource utilization of semidry desulfurization ash and titanium dioxide byproduct copperas |
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Application publication date: 20140618 |