Process for producing sulfate acid from gypsum

A technology of gypsum and sulfuric acid, applied in the direction of sulfur trioxide/sulfuric acid, energy input, etc., can solve the problems of high construction investment, low gas concentration, increased production cost, etc., to solve operational difficulties, solve secondary pollution, and reduce heat energy loss Effect

Inactive Publication Date: 2008-11-19
武健民 +1
View PDF0 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] my country's phosphate rock resources are abundant but not rich. With the extensive use of rich ore, the depletion of phosphate rock is becoming more and more serious. P 2 o 5 The content is generally less than 30%, SiO 2 The content is higher than 12%, resulting in poor quality phosphogypsum residue generated in the production of phosphoric acid, making the phosphogypsum residue unusable
It has long been reported that the poor quality of phosphogypsum waste residue made the unit unable to operate
The grades of natural gypsum in mineral deposits vary greatly, most of SiO 2 High content (essentially mixed with a certain amount of soil), which affects the utilization of natural gypsum
[0004] The original method of making sulfuric acid from gypsum has strict requirements on the raw material phosphogypsum or natural gypsu

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
  • Process for producing sulfate acid from gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] 1. Dry the waste residue phosphogypsum or natural gypsum dihydrate produced by phosphoric acid to less than 10.0% water content, and store the natural anhydrite without drying (but crushing and grinding). Auxiliary materials such as coke and clay are stored and ground after drying. Various raw materials are batched according to a certain ratio and then enter the raw meal homogenization warehouse. The rate value of gypsum raw meal is controlled as follows: the lime saturation coefficient KH is 0.80-0.97, the silicic acid rate SM is 2.40-4.50, and the iron rate IM is 2.10-3.30.

[0016] 2. The raw meal in the homogenization warehouse is sent to the three-stage cyclone preheating system after being homogenized by multi-point feeding. The raw meal is raised from about 50 °C in the homogenization room to 550--660 °C and enters the kiln. The temperature of the gas coming out of the kiln and entering the preheater is 650--850°C, and it becomes about 300°C after preheating the...

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

A method for producing sulfuric acid from gypsum comprises the steps of crushing gypsum, clay, coke and auxiliary materials, homogenizing, preheating in a three-stage preheater, calcinating in a rotary kiln while introducing oxygen-enriched air to obtain SO2 gas and clinker, feeding the SO2 gas into a sulfuric acid system for sulfuric acid production, and cooling the clinker with a cooling machine and feeding into a cement system for cement production. The inventive method designs raw material ratio, etc. with the focus of sulfuric acid production through the steps of preheating with the three-stage preheater and introducing oxygen-enriched air to produce sulfuric acid; and has the advantages of reduced calcination difficulty, remarkably increased sulfuric acid yield, remarkably reduced production cost, remarkably reduced calcination heat consumption, and distinct environmental and economic benefits. Also, the tail gas emission comes up to standards.

Description

technical field [0001] The invention relates to a technology for producing sulfuric acid from waste residue phosphogypsum or natural gypsum or flue gas desulfurization gypsum or a mixture of several kinds of gypsum in the phosphate fertilizer industry. It belongs to the technical field of sulfuric acid production. A production method for producing sulfuric acid from flue gas desulfurization gypsum or a mixture of several gypsums and by-product cement. Background technique [0002] my country is a large agricultural country lacking in sulfur resources. Phosphate fertilizer production accounts for more than 70% of sulfuric acid consumption, sulfuric acid with sulfur as raw material accounts for 50% of the total sulfuric acid output, and more than 95% of sulfuric acid raw materials come from imports, plus my country's dependence on foreign sulfur resources for imported sulfuric acid exceeds 55%. Recently, the price of sulfur has skyrocketed and remained high. Using gypsum as r...

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): C01B17/69
CPCY02P20/129
Inventor 武健民黄斌
Owner 武健民
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