Treatment process of dry method or semi-dry method smoke gas desulfurized slag

A treatment process and desulfurization slag technology, applied in the field of solid waste treatment, can solve the problems of limited product value, inability to commercialize the technology, high cost, etc., and achieve the effect of low cost, mature equipment and good economy.

Active Publication Date: 2012-01-18
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both catalytic and thermal oxidation technologies have to pay a high cost, and the

Method used

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  • Treatment process of dry method or semi-dry method smoke gas desulfurized slag
  • Treatment process of dry method or semi-dry method smoke gas desulfurized slag

Examples

Experimental program
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Example Embodiment

[0032] Example 1: 90 tons of desulfurization slag is processed every day, and 270 tons of liquid steel slag is added every day. Desulfurization slag and liquid steel slag are added in batches, each batch is added with 6 tons of desulfurization slag and 18 tons of liquid steel slag is added at the same time. The ratio of steel slag particles to desulfurization slag is 3:1. The time for the mixture from entering the kiln to exiting the kiln is about 75 minutes, of which the reaction in the kiln is 50 minutes, the temperature of the mixture exiting the kiln is 320°C, and the calcium sulfite conversion rate is 80%.

Example Embodiment

[0033] Example 2: Processing 60 tons of desulfurization slag per day, and mixing 240 tons of liquid steel slag per day. Desulfurization slag and liquid steel slag are added in batches, each batch adding 5 tons of desulfurization slag, while adding 20 tons of liquid steel slag, the ratio of steel slag particles to desulfurization slag is 3:1. The time for the mixture from entering the kiln to exiting the kiln is about 65 minutes, of which the reaction in the kiln is 40 minutes, the temperature of the mixture leaving the kiln is 380°C, and the calcium sulfite conversion rate is 90%.

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Abstract

The invention relates to a treatment process of dry method or semi-dry method smoke gas desulfurized slag, which provides a new process for calcium base dry method or semi-dry method smoke gas desulfurized slag utilizing liquid steel slag afterheat for oxidization. The calcium base dry method or semi-dry method smoke gas desulfurized slag has the major ingredients of calcium sulfite, the calcium sulfite is mixed with compressed high-temperature steel slag particles crushed by air beams, the materials enter an oxidization rotary kiln for carrying out sufficient stirring, heat transfer and oxidization, then, a grate cooler is used for cooling and temperature reduction, wind power screening equipment is used for screening, the steel slag particles are directly discharged out, and the oxidized desulfurized slag is carried to a cloth bag material collector through gas to be collected. The desulfurized slag treated by the process has more than 80 percent of calcium sulfite and aluminum oxides and can be directly used as auxiliary building materials, and the steel slag particles can be used as building material raw materials after being finely ground.

Description

technical field [0001] The invention relates to a dry or semi-dry flue gas desulfurization slag treatment process, which belongs to the technical field of solid waste treatment. Background technique [0002] The acid rain pollution in my country is mainly sulfuric acid type, and the pollution trend continues to increase. In the "Eleventh Five-Year Plan", the country requires a 10% reduction in sulfur dioxide emissions, and the total amount of sulfur dioxide emissions will be controlled at 18 million tons. For this reason, the thermal power generation industry and the metallurgical sintering industry, as key industries for sulfur dioxide emissions, have built a large number of flue gas desulfurization facilities. The most widely used processes in these facilities are limestone-gypsum wet, rotary spray semi-dry and circulating fluidized bed dry. Among them, the rotary spray semi-dry method and the circulating fluidized bed dry method both use quicklime or slaked lime as the ...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00C21B3/06
CPCY02W30/20Y02W30/50
Inventor 俞非漉朱晓华李鹏飞卢忠飞
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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