Process for preparation of acid and combined production of cement through suspension decomposition of phosphogypsum out of kiln
A phosphogypsum and cement technology, applied in cement production, inorganic chemistry, non-metallic elements, etc., to achieve the effect of increasing SO2 concentration, increasing decomposition reaction time, and prolonging residence time
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Embodiment 1
[0030] A kind of phosphogypsum kiln suspended decomposition acid production co-production cement process, its process flow chart is shown in figure 1 , the fuel coal adopted in the hot blast stove is lignite (calorific value is 5500~6500 kcal / kg), specifically comprises the following steps:
[0031] 1) Put 10-80 μm phosphogypsum hemihydrate and 10-80 μm coke, bauxite, shale, and electric furnace slag into a horizontal ribbon mixer at a mass ratio of 1000:50:8:52:8 and mix to obtain Phosphogypsum cement raw meal; carbon in coke is used as reducing agent to reduce CaSO 4 Formation of CaO and SO 2 , the carbon content is more than 75wt%, the volatile matter is less than 5%, and the effect is good. The higher the carbon content, the less the amount of coke in the raw meal ingredients, and the less ash is brought in, which is conducive to the stability of the raw meal composition.
[0032] 2) The phosphogypsum cement raw meal is homogenized and transported to the high-level silo...
Embodiment 2
[0040] A phosphogypsum kiln suspended decomposition acid production co-production cement process, the fuel used in the hot stove is anthracite (calorific value 6000 ~ 6500 kcal / kg), the process is roughly the same as the embodiment 1, the difference is :
[0041] Put 10-80μm phosphogypsum dihydrate and 10-80μm coke, bauxite, shale, and electric furnace slag into a horizontal ribbon mixer at a mass ratio of 1000:50:8:52:8 and mix them. After that, it enters the suspension preheating system to preheat to 820°C through the elevator, high-level silo, and feeder, and then enters the U-shaped reaction tube. The phosphogypsum cement raw meal from the feeding pipe of the suspension preheating system is sent through the hot blast stove. High-temperature flue gas C (temperature 1190°C) enters the U-shaped reaction tube at high speed, and undergoes decomposition reaction at 845°C. After the reaction is completed, it passes through the cyclone separator (C 5 Cyclone) separation of high t...
Embodiment 3
[0044] A phosphogypsum kiln suspended decomposition acid co-production cement process, the fuel used in the hot blast furnace is a mixture of bituminous coal (calorific value 6500-8900 kcal / kg) and sulfur (mass ratio of bituminous coal to sulfur is 1:6 ), its technological process is roughly the same as embodiment 1, the difference is:
[0045] Put 10-80μm hemihydrate phosphogypsum and 10-80μm coke, bauxite, shale, and electric furnace slag into the wind mill and mix them in the mass ratio of 1000:30:6:40:6. After the mixing is completed, go through the elevator , high-level silo, and feeder enter the suspension preheating system to preheat to 973°C, and then enter the U-shaped reaction tube. The phosphogypsum cement raw meal from the suspension preheating system feeding pipe passes through the high-temperature flue gas C sent by the hot blast furnace (The temperature is 1205°C) enters the U-shaped reaction tube at high speed, and decomposes at 993°C. After the reaction is com...
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