Coproducing cement technological method of producing acid using phosphogypsum and sulfur

A process method and sulfuric acid-making technology, applied in the direction of sulfur trioxide/sulfuric acid, etc., can solve the problems of increasing production cost, large influence of acid-making equipment, low efficiency, etc., to reduce the possibility of pollution, improve production intensity, and improve the overall effect of benefit

Active Publication Date: 2007-04-18
GUIZHOU CHANHEN CHEM CO LTD
View PDF0 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] ① Raw gas SO 2 The concentration is low, the conversion heat of two rotations and two suctions cannot be balanced, only one rotation and one suction can be used, the tail gas cannot be emptied directly, and the operating cost is high
[0005] ② Raw gas SO 2 The concentration of the acid is low, resulting in low production intensity of the production equipment, resulting in large investment and low efficiency of the acid plant
[0006] ③Due to the fact that the calcination process of the rotary kiln is easy to form rings and burn out, the processing time is long, and the follow-up equipment can only be produced, resulting in a low utilization rate of the equipment
At the same time, the temperature of each stage of conversion drops when waiting for production, and the conversion must rely on external heat to raise the temperature during production, which increases the production cost
[0007] ④The operation of the rotary kiln is not easy to master, and the working conditions fluctuate greatly, which has a great impact on the acid plant
When the kiln is in a strong reducing atmosphere, sublimated sulfur is produced, which blocks the pipes and equipment of the purification system; when the kiln is in a strong oxidizing atmosphere, phosphogypsum cannot be completely decomposed, resulting in kiln gas SO 2 The concentration is low, which has a great impact on acid production, and at the same time leads to unqualified quality of cement products

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Coproducing cement technological method of producing acid using phosphogypsum and sulfur

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] After reslurry washing and purification, free P 2 o 5 The phosphogypsum is 0.65% and the F content is 0.21%. It is sent to the dehydrator to dehydrate and remove the washing water, and then enters the dryer for drying. After cooling, it enters the batching bin. Anthracite, silica and kaolin are ground by an air-swept ball mill to reach a particle size of -200 mesh sieve between 10 and 12%, and enter the batching bin through blasting to homogenize the prepared cement raw materials. The homogenized raw meal is put into the rotary kiln for calcination, and the decomposition section of the rotary kiln is controlled at 1280-1335°C through coal injection gun and air volume adjustment, and the carbon in the anthracite in the kiln reduces phosphogypsum to CaO and SO 2 , the CaO in the material is in the sintering section at 1430-1480 ° C, and the mineralization reaction occurs with the silica to survive the dicalcium silicate (C 2 S) and tricalcium silicate (C 3 S) The reac...

Embodiment 2

[0055] After reslurry washing and purification, free P 2 o 5 The phosphogypsum is 0.96% and the F content is 0.33%. It is sent to the dehydrator to dehydrate and remove the washing water, and then enters the dryer for drying. After cooling, it enters the batching bin. Anthracite, silica and kaolin are ground by an air-swept ball mill to reach a particle size of -200 mesh sieve between 10 and 12%, and enter the batching bin through blasting to homogenize the prepared cement raw materials. The homogenized raw meal is put into the rotary kiln for calcination, and the decomposition section of the rotary kiln is controlled at 1280-1335°C through coal injection gun and air volume adjustment, and the carbon in the anthracite in the kiln reduces phosphogypsum to CaO and SO 2 , the CaO in the material is in the sintering section at 1430-1480 ° C, and the mineralization reaction occurs with the silica to survive the dicalcium silicate (C 2 S) and tricalcium silicate (C 3 S) The reac...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention relates to a process capable of simultaneously preparing acid and producing cement by combining phosphogypsum with sulfur. It is characterized by utilizing waste slag phosphogypsum obtained by wet process phosphoric acid production to prepare acid and produce cement. In the concrete, the invented process includes the following steps: utilizing low-concentration SO2 gas discharged out from rotary kiln of phosphogypsum acid-making system and making said kiln gas undergo the processes of washing, cleaning and drying, then be mixed with high-concentration SO2 gas discharged from sulfur acid-making system to obtain the SO2 gas whose concentration is 8-9%; and adopting an advanced two-stage two-absorption acid-making process to prepare sulfuric acid; at the same time firing the phosphogypsum in the rotary kiln to obtain cement clinker, grinding and blending so as to obtain cement.

Description

Technical field: [0001] The present invention relates to a process method for combining phosphogypsum and sulfur to produce acid and co-produce cement. It uses wet-process phosphoric acid to produce waste residue phosphogypsum to produce cement sulfuric acid. Specifically, it refers to the use of phosphogypsum acid system to produce low-concentration SO from a rotary kiln. 2 Gas, the kiln gas is washed, purified and dried, and the high concentration SO 2 The gas is mixed to form SO with a concentration of 8-9% by volume 2 The gas is made into sulfuric acid by the advanced two-turn-two-suction acid production process, and at the same time, phosphogypsum is fired into cement clinker in a rotary kiln, and then cement is made into cement through grinding and batching. Background technique: [0002] The main component of waste phosphogypsum produced by wet-process phosphoric acid production is CaSO 4. 2H 2 O, is currently mainly used to produce cement and produce sulfuric acid...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B17/69C04B11/26
Inventor 李光明李进李子军王佳才邹建
Owner GUIZHOU CHANHEN CHEM CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap