CN1227824A - Improved method for producing sulfuric acid and jointly producing cement - Google Patents
Improved method for producing sulfuric acid and jointly producing cement Download PDFInfo
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- CN1227824A CN1227824A CN 98124985 CN98124985A CN1227824A CN 1227824 A CN1227824 A CN 1227824A CN 98124985 CN98124985 CN 98124985 CN 98124985 A CN98124985 A CN 98124985A CN 1227824 A CN1227824 A CN 1227824A
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- Prior art keywords
- sulfuric acid
- kiln
- cement
- gas
- rotary kiln
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
An improved process for joint production of both sulfuric acid and cement features that sulfur (1-7 wt.%) is mixed with the uniformly mixed raw materials before they are charged into high-temp. rotary kiln in order to increase the content of SO2 in kiln gas, resulting in higher output of sulfuric acid without change in production condition and energy consumption.
Description
The present invention relates to a kind of improving one's methods of producing sulfuric acid and jointly cement of making.
The method of making at present producing sulfuric acid and jointly cement as shown in Figure 1, in turn include the following steps: (one) selects phosphogypsum, fine sand and coke breeze to mix; (2) inherent 1000-1500 ℃ of calcining of input high temperature rotary kiln; (3) cement clinker of output adds retardant, blended material etc. and is mixed and grinding at the bottom of the kiln; (4) sieve and make cement; (5) kiln gas of deriving from the venting port of rotary kiln carries out aftertreatment, makes sulfur dioxide gas; (6) sulfur dioxide gas is carried out the absorption of conversion processing and water and make sulfuric acid, its major defect is:
(major ingredient is CaSO owing to the raw material phosphogypsum
4) sulphur content lower, make that in rotary kiln the content of sulfurous gas is lower, therefore makes vitriolic output lower in the kiln gas that the calcining back produces.
At above-mentioned defective of the prior art, the inventor creates technical scheme of the present invention through constantly studying and testing.
The object of the present invention is to provide a kind of improving one's methods of producing sulfuric acid and jointly cement of making, its innovative approach is to keep under the constant condition of working condition and power consumption, the sulphur that adds suitable proportion in proportioning raw materials reaches content that improves sulfurous gas in the kiln gas and the purpose that improves sulphuric acid output.
The object of the present invention is achieved like this: a kind ofly make improving one's methods of producing sulfuric acid and jointly cement, in turn include the following steps: (one) selects phosphogypsum, fine sand and coke breeze to mix; (2) inherent 1000-1500 ℃ of calcining of input high temperature rotary kiln; (3) cement clinker of output adds retardant, blended material etc. and is mixed and grinding at the bottom of the kiln; (4) sieve and make cement; (5) kiln gas of deriving from the venting port of rotary kiln carries out aftertreatment, makes sulfur dioxide gas; (6) sulfur dioxide gas is carried out the absorption of conversion processing and water and make sulfuric acid, it is characterized in that: the content of sulfurous gas in the kiln gas of above-mentioned for improving (five), mix the sulphur of 1-7% (weight) in the raw material that this mixes.
Mix the sulphur of 2% (weight) before this raw material that mixes input high temperature rotary kiln.
Major advantage of the present invention is: because the sulphur content in the phosphogypsum is lower than 43% in the raw material, make and in rotary kiln, calcine in the kiln gas of back generation, the content of sulfurous gas is also lower, generally below 7%, by measuring the content of oxygen in the kiln gas, in proportioning raw materials, mix 1-7% (weight) sulphur, keeping under the constant condition of working condition and power consumption, the content of sulfurous gas in the kiln gas can be brought up to more than 9%, thereby be improved vitriolic output, facts have proved increases by 1 ton of sulphur, can increase production 93% sulfuric acid 2-4 ton, have preferable effect of increasing production.
The present invention is further described below in conjunction with preferred embodiment and accompanying drawing:
Fig. 1 is the process flow diagram of manufacturing producing sulfuric acid and jointly cement commonly used;
Fig. 2 is the process flow diagram of manufacturing producing sulfuric acid and jointly cement of the present invention;
Consult Fig. 2, innovative approach of the present invention is according to the content of measuring oxygen in the kiln gas, create the sulphur that mixes 1-7% (weight) before the raw material input high temperature rotary kiln after mixing in proportion, its addition sequence adds in the raw material that mixes after sparing can reduce the loss of sulphur in batch mixing, guarantees that the sulphur that mixes fully participates in the chemical reaction in the high temperature rotary kiln.The sulphur of its adding is not The more the better because must guarantee its add-on all with rotary kiln in oxygen reaction generate sulfurous gas, otherwise the excessive significant wastage that will cause raw material of sulphur adding not reaching the purpose of the raising output that reduces cost.
Set forth effect of the present invention below in conjunction with concrete production instance.
Proportioning raw materials is 89 kilograms of phosphogypsums, 6 kilograms of coke breezes, and 5 kilograms of fine sands, the afterbody input from 88 meters long tilting rotary kiln upper end enters about 1200 ℃ calcining section through preheating section, decomposition section, carries out sufficient chemical reaction, and its main reaction formula is:
Cement clinker wherein adds the blended material stove quarrel of 8% weight and 5% retardant calcium sulphate hemihydrate and carries out combined grinding through the head discharging by the bottom of the temperature descending section of rotary kiln, makes cement; Its kiln gas of being derived by the venting port of rotary kiln makes sulfur dioxide gas by postprocessing working procedures such as cold smoke chamber, waste heat boiler cooling, electric precipitation, purification, dryings, passes through conversion processing again and add the water absorption to make sulfuric acid.Effect of the present invention can confirm that by technical process commonly used, by per hour feeding intake 10 tons, per tour was calculated in 8 hours from following example, and feeding quantity is 80 tons/class, and the content that records sulfurous gas in the kiln gas is 6.5%, and the sulfuric acid of per tour production 93% is about 40 tons.
Use method of the present invention, mixing sulphur 2% (weight) before the input rotary kiln after the above-mentioned identical batch mixes, promptly 1.6 tons/class, the content that records sulfurous gas in its kiln gas is 9%, the sulfuric acid of per tour production 93% is about 45 tons, can be clear that thus under the constant condition of working condition and power consumption,, improve the content and the vitriolic output of sulfurous gas in the kiln gas greatly by adding sulphur.
Claims (2)
1, a kind ofly make improving one's methods of producing sulfuric acid and jointly cement, in turn include the following steps: (one) selects phosphogypsum, fine sand and coke breeze to mix; (2) inherent 1000-1500 ℃ of calcining of input high temperature rotary kiln; (3) cement clinker of output adds retardant, blended material etc. and is mixed and grinding at the bottom of the kiln; (4) sieve and make cement; (5) kiln gas of deriving from the venting port of rotary kiln carries out aftertreatment, makes sulfur dioxide gas; (6) sulfur dioxide gas is carried out the absorption of conversion processing and water and make sulfuric acid, it is characterized in that: the content of sulfurous gas in the kiln gas of above-mentioned for improving (five), mix the sulphur of 1-7% (weight) in the raw material that this mixes.
2, improving one's methods of manufacturing producing sulfuric acid and jointly cement as claimed in claim 1 is characterized in that this raw material that mixes input high temperature rotary kiln mixes the sulphur of 2% (weight) before.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98124985 CN1227824A (en) | 1998-11-27 | 1998-11-27 | Improved method for producing sulfuric acid and jointly producing cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98124985 CN1227824A (en) | 1998-11-27 | 1998-11-27 | Improved method for producing sulfuric acid and jointly producing cement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1227824A true CN1227824A (en) | 1999-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98124985 Pending CN1227824A (en) | 1998-11-27 | 1998-11-27 | Improved method for producing sulfuric acid and jointly producing cement |
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| CN (1) | CN1227824A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100360397C (en) * | 2005-11-18 | 2008-01-09 | 四川省犍为明丰化工有限公司 | Method for producing sulfuric acid utilizing phosphogypsum slag |
| CN100453450C (en) * | 2006-10-31 | 2009-01-21 | 李光明 | Coproducing cement technological method of producing acid using phosphogypsum and sulfur |
| CN100513341C (en) * | 2006-04-04 | 2009-07-15 | 马芸仙 | Method for producing cement and vitriol from high silicon ardealite |
| CN101318631B (en) * | 2008-07-10 | 2012-01-11 | 昆明理工大学 | Method and apparatus for decomposing phosphogypsum to produce sulphuric acid, generating electricity power and cement with quiescent state reduction |
-
1998
- 1998-11-27 CN CN 98124985 patent/CN1227824A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100360397C (en) * | 2005-11-18 | 2008-01-09 | 四川省犍为明丰化工有限公司 | Method for producing sulfuric acid utilizing phosphogypsum slag |
| CN100513341C (en) * | 2006-04-04 | 2009-07-15 | 马芸仙 | Method for producing cement and vitriol from high silicon ardealite |
| CN100453450C (en) * | 2006-10-31 | 2009-01-21 | 李光明 | Coproducing cement technological method of producing acid using phosphogypsum and sulfur |
| CN101318631B (en) * | 2008-07-10 | 2012-01-11 | 昆明理工大学 | Method and apparatus for decomposing phosphogypsum to produce sulphuric acid, generating electricity power and cement with quiescent state reduction |
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