Method for realizing collaborative resource utilization of semi-dry desulfurization ash and titanium dioxide byproduct copperas

A semi-dry desulfurization and titanium dioxide technology, which is applied in the field of comprehensive utilization of resources, can solve the problems of small dosage, and achieve the effects of low content of harmful impurities, significant economic and environmental benefits, and low investment.

Active Publication Date: 2019-04-09
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sulfuric acid method is an important method for the production of titanium dioxide. One of the disadvantages of this method is that solid waste such as green vitriol will be generated during the production process. According to statistics, 3-4 tons of green vitriol will be produced for every 1 ton of titanium dioxide produced. The quantity is very large. Alum is mainly used as feed additives, water purifiers, fertilizers, etc., but the amount used is relatively small, and most of them are still stored as solid waste. With the continuous increase in demand and output of titanium dioxide, the comprehensive utilization of by-product green alum will be solved. more prominent

Method used

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  • Method for realizing collaborative resource utilization of semi-dry desulfurization ash and titanium dioxide byproduct copperas
  • Method for realizing collaborative resource utilization of semi-dry desulfurization ash and titanium dioxide byproduct copperas

Examples

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Effect test

Embodiment 1

[0036] Using the above raw materials, fully mix the semi-dry desulfurization ash and titanium dioxide by-product green vitriol in a mass ratio of 3:7, dry at a temperature of 120°C, and send the dried mixture into a high-temperature furnace for roasting. The roasting temperature is 750°C, the roasting time is 100min, and the roasting atmosphere is a weakly reducing atmosphere; the sulfuric acid concentration of the flue gas produced during the roasting process is 93% after dust removal, purification, catalytic oxidation, absorption and other processes; the residue produced after roasting is all The iron content is 41.2%, and the calcium oxide content is 45.7%. The proportion of 2% is mixed with iron ore for sintering to replace part of iron concentrate powder and limestone, and has no negative impact on sintering.

Embodiment 2

[0038] Using the above raw materials, fully mix the semi-dry desulfurization ash and titanium dioxide by-product green vitriol in a mass ratio of 7:3, dry at 180°C, and send the dried mixture into a high-temperature furnace for roasting. The roasting temperature is 950°C, the roasting time is 40min, and the roasting atmosphere is a weakly reducing atmosphere; the sulfuric acid concentration of the flue gas produced during the roasting process is 98% after dust removal, purification, catalytic oxidation, absorption and other processes; the residue produced after roasting is all The iron content is 15.7%, and the calcium oxide content is 81.5%. The proportion of 0.5% is mixed with iron ore for sintering to replace part of iron concentrate powder and limestone, and has no negative impact on sintering.

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Abstract

The invention discloses a method for realizing collaborative resource utilization of semi-dry desulfurization ash and titanium dioxide byproduct copperas. The method sequentially comprises the following steps of S1, mixing the semi-dry desulfurization ash and the titanium dioxide byproduct copperas according to a certain ratio and then drying; S2, feeding the dried materials into a high-temperature furnace for roasting; S3, carrying out dust removal, purifying, catalytic oxidation and absorption the preparation sulfuric acid on the flue gas generated in the step S2; S4, feeding the residue generated in the step S2 into the iron ore sintering mixture to replace part of the iron-containing raw material and the flux. The method has the advantages that the sintering semi-dry desulfurization ash and the titanium dioxide byproduct copperas are simultaneously processed, so that the problem of environmental protection is solved, and treating waste by using waste is achieved.

Description

technical field [0001] This application belongs to the comprehensive utilization of resources, in particular to a method for synergistic resource utilization of semi-dry desulfurization ash and titanium dioxide by-product green vitriol. Background technique [0002] Due to the advantages of high desulfurization efficiency, short process flow, small footprint, and low investment, the semi-dry desulfurization process is widely used in the flue gas desulfurization projects of small and medium-sized generating units in my country and sintering plants of some iron and steel enterprises. The raw material of the semi-dry desulfurization process is quicklime, and the by-product produced after flue gas desulfurization is semi-dry desulfurization ash, whose main components are: free calcium oxide, calcium sulfite, calcium carbonate, calcium sulfate and calcium hydroxide and other substances. Due to the unstable composition of semi-dry desulfurization ash, which is weakly alkaline and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/16C01B17/74
CPCC01B17/74C22B1/02C22B1/16Y02P10/20
Inventor 毛瑞茅沈栋王飞杜屏
Owner ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD
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