CN1227825A - Method for producing sulfuric acid and jointly producing cement by using anthracite cinder instead of coke breeze - Google Patents
Method for producing sulfuric acid and jointly producing cement by using anthracite cinder instead of coke breeze Download PDFInfo
- Publication number
- CN1227825A CN1227825A CN 98124986 CN98124986A CN1227825A CN 1227825 A CN1227825 A CN 1227825A CN 98124986 CN98124986 CN 98124986 CN 98124986 A CN98124986 A CN 98124986A CN 1227825 A CN1227825 A CN 1227825A
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- CN
- China
- Prior art keywords
- sulfuric acid
- white coal
- coal slag
- producing
- cement
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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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- 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
- C04B7/44—Burning; Melting
- C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
Abstract
A process for joint production of both sulfuric acid and cement with anthracite cinder instead of coke includes such technological steps as selecting raw materials including ardealite (85-92 wt. portions), anthracite cinder (6-9) and fine sand (5-8), proportionally mixing, calcining in high-temp. rotary kiln, producing clinker which is processed into cement, and preparing sulfuric acid by further processing and suction of kiln gas. Its advantages are high quality of products, saving raw materials, and low cost.
Description
The invention relates to a method for producing sulfuric acid and cement, in particular to a method for producing sulfuric acid and cement by using white coal slag to replace coke surface.
The method for producing sulfuric acid and cement at present sequentially comprises the following steps as shown in figure 1: firstly, selecting raw materials and uniformly mixing; secondly, inputting the mixture into a high-temperature rotary kiln to calcine at the temperature of 1000 ℃ and 1500 ℃; thirdly, adding a retarder, a mixed material and the like into the cement clinker output from the kiln bottom for mixing and grinding; (IV) sieving to prepare cement; fifthly, performing post-treatment on kiln gas led out from an exhaust port of the rotary kiln to prepare sulfur dioxide gas; sixthly, sulfur dioxide gas is converted and absorbed by water to prepare sulfuric acid, and the main defects are that:
1. the coke surface used as the raw material is formed by sintering high-quality coal powder into a coke block and then processing the coke block by a grinding process, and the manufacturing cost is high.
2. The coke surface of the high-temperature rotary kiln is easy to lose in the calcining process, cannot react with phosphogypsum to the maximum extent, and a large proportion of coke surface must be added, so that the waste of raw materials is caused, and the manufacturing cost is increased.
In view of the above-mentioned defects, the present inventors have conducted long-term research and practice to create the technical solution of the present invention.
The invention aims to provide a method for preparing sulfuric acid and co-producing cement by using white coal slag to replace coke surface, which overcomes the defects of the prior art and achieves the purposes of saving raw materials and reducing manufacturing cost on the premise of ensuring quality.
The purpose of the invention is realized as follows: a method for preparing sulfuric acid and co-producing cement by using white coal slag to replace coke surface sequentially comprises the following steps:
firstly, selecting raw materials and uniformly mixing; secondly, inputting the mixture into a high-temperature rotary kiln to calcine at the temperature of 1000 ℃ and 1500 ℃; thirdly, adding a retarder, a mixed material and the like into the cement clinker output from the kiln bottom for mixing and grinding; (IV) sieving to prepare cement; fifthly, performing post-treatment on kiln gas led out from an exhaust port of the rotary kiln to prepare sulfur dioxide gas; sixthly, the sulfur dioxide gas is converted and absorbed by water to prepare sulfuric acid, and the method is characterized in that: selecting raw materials, namely white coal slag instead of coke powder, wherein the raw materials are proportioned as follows (in parts by weight):
85-92 parts of phosphogypsum;
6-9 parts of white coal slag;
5-8 parts of fine sand.
Selecting 90 kg of phosphogypsum, 8 kg of white coal slag and 6 kg of fine sand as raw materials and proportioning; the white coal slag comprises leftovers generated in the production of semi-water gas; the white coal slag comprises white coal surface.
The main advantages of the invention are:
1. the white coal slag is the leftover produced in the production of semi-water gas in small nitrogen fertilizer plants, has very small industrial application range, is generally used for producing honeycomb briquette, has the price of less than half of coke, and is often accumulated like a mountain in non-heating seasons.
2. The white coal slag does not need to be ground, and can be directly used in the manufacturing process, thereby reducing the process flow and the cost.
3. The white coal slag is not easy to lose in the calcining process in the high-temperature rotary kiln, can react with the phosphogypsum to the maximum extent, and reduces the adding proportion thereof, thereby improving the product quality, saving the raw materials and reducing the cost.
This is further described below in conjunction with the preferred embodiments and manufacturing process flow diagrams.
Fig. 1 is a flow chart of a conventional manufacturing process.
FIG. 2 is a flow chart of the manufacturing process of the present invention.
Referring to fig. 2, the process flow of the present invention includes the following steps:
material selection and uniform mixing:
the raw material mixture ratio is selected as follows: 90 kg of phosphogypsum, 8 kg of white coal slag and 6 kg of fine sand with the grain size of less than 0.08mm are uniformly mixed. The phosphogypsum is the waste material generated in the process of producing ammonium phosphate fertilizer, and mainly comprisesComponent is CaSO4. The white coal cinder is the leftover produced in the production of semi-water gas in small nitrogen fertilizer plants. The fine sand is common sand and is ground into fine sand with the grain size of less than 0.08 mm.
(II) calcining in a high-temperature rotary kiln:
the mixture is input from the tailpart of the upper end of the inclined rotary kiln, passes through a preheating section and a decomposing section to a sintering section, and undergoes chemical reaction at 1200 ℃ to generate cement clinker and kiln gas.
The main chemical reaction formula is as follows:
(phosphogypsum) (white coal slag) (fine sand) kiln gas comprising CO2And SO2The cement clinker is led out from an exhaust port of the rotary kiln, and is discharged from the head part at the bottom end after passing through a cooling section of the rotary kiln.
(III) mixing and grinding:
adding 8% of mixed material slag and 5% of retarder calcium sulfate hemihydrate into the cement clinker, mixing, and grinding.
(IV) sieving:
sieving with a screen with aperture of 0.08mm to obtain cement.
(V) kiln gas aftertreatment:
and (2) leading out kiln gas generated by calcining in the rotary kiln from an exhaust port of the rotary kiln, and performing post-treatment such as cooling, electric precipitation, purification, drying and the like by a smoke cooling chamber and a waste heat boiler to obtain sulfur dioxide gas.
(VI) conversion and absorption:
the sulfur dioxide gas in the fifth step is converted and absorbed by water to prepare sulfuric acid, and the process is not described in detail in the prior art.
The method of the invention has the following production effect embodiments:
the properties of cement clinker produced by the process of the invention compared with conventional processes are shown in Table 1:
TABLE 1
It is evident from the above product comparison performance indicators that: the cement clinker produced by the method has the advantages of short setting time and high breaking strength and compressive strength, namely the method improves the product quality.
The cost accounting result of the method of the invention is as follows:
two month cost accounting for normal production is selected: the average cost of cement clinker produced by using traditional coke surface as raw material in 11 months and 12 days in 97 years is 150 yuan/ton; the cement clinker produced by the method of the invention has an average cost of 100 yuan/ton in months 4 and 5 of 1998. The cost is reduced by 50 yuan/ton, and the total cost is reduced by 220 yuan/year according to the calculation of producing 4.4 ten thousand tons of cement clinker (actually exceeding the number) all the year round.
The production effect proves that the method has the remarkable effects of ensuring the quality and reducing the cost.
Claims (4)
1. A method for preparing sulfuric acid and co-producing cement by using white coal slag to replace coke surface sequentially comprises the following steps:
firstly, selecting raw materials and uniformly mixing; secondly, inputting the mixture into a high-temperature rotary kiln to calcine at the temperature of 1000 ℃ and 1500 ℃; thirdly, adding a retarder, a mixed material and the like into the cement clinker output from the kiln bottom for mixing and grinding; (IV) sieving to prepare cement; fifthly, performing post-treatment on kiln gas led out from an exhaust port of the rotary kiln to prepare sulfur dioxide gas; sixthly, the sulfur dioxide gas is converted and absorbed by water to prepare sulfuric acid, and the method is characterized in that: selecting raw materials, namely white coal slag instead of coke powder, wherein the raw materials are proportioned as follows (in parts by weight):
85-92 parts of phosphogypsum;
6-9 parts of white coal slag;
5-8 parts of fine sand.
2. The method for producing sulfuric acid and co-producing cement using white coal slag instead of coke breeze surface as claimed in claim 1, wherein: the raw materials and the mixture ratio are 90 kg of phosphogypsum, 8 kg of white coal slag and 6 kg of fine sand.
3. The method for producing sulfuric acid and co-producing cement using white coal slag instead of coke breeze surface as claimed in claim 1, wherein: the white coal slag comprises leftovers produced in the manufacture of semi-water gas.
4. The method for producing sulfuric acid and co-producing cement using white coal slag instead of coke breeze surface as claimed in claim 1, wherein: the white coal slag comprises white coal surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98124986 CN1227825A (en) | 1998-11-27 | 1998-11-27 | Method for producing sulfuric acid and jointly producing cement by using anthracite cinder instead of coke breeze |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98124986 CN1227825A (en) | 1998-11-27 | 1998-11-27 | Method for producing sulfuric acid and jointly producing cement by using anthracite cinder instead of coke breeze |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1227825A true CN1227825A (en) | 1999-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98124986 Pending CN1227825A (en) | 1998-11-27 | 1998-11-27 | Method for producing sulfuric acid and jointly producing cement by using anthracite cinder instead of coke breeze |
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| CN (1) | CN1227825A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453450C (en) * | 2006-10-31 | 2009-01-21 | 李光明 | Coproducing cement technological method of producing acid using phosphogypsum and sulfur |
-
1998
- 1998-11-27 CN CN 98124986 patent/CN1227825A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453450C (en) * | 2006-10-31 | 2009-01-21 | 李光明 | Coproducing cement technological method of producing acid using phosphogypsum and sulfur |
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| WD01 | Invention patent application deemed withdrawn after publication |