Novel method for producing cement sulfuric acid from phosphogypsum with calcium oxide as intermediate and sulfur as anti-clinkering agent
A technology of calcium oxide and a new method, applied in chemical instruments and methods, cement production, sulfur compounds, etc., can solve problems such as low decomposition efficiency, low waste heat utilization rate, and narrow operating range, so as to overcome the narrow operating range and improve thermal efficiency , the effect of reducing the decomposition temperature
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Embodiment 1
[0026] A new method for preparing cement sulfuric acid from phosphogypsum with calcium oxide as an intermediate and sulfur as an anti-sintering agent, comprising steps:
[0027] 1) The gypsum and solid sulfur after drying and mixing by the heater are put into the decomposition furnace to be heated and decomposed through the screw feeder. The heating temperature is 800°C, and the solid product calcium oxide and the gas product containing sulfur dioxide are obtained;
[0028] 2) The solid product calcium oxide and other raw materials required for cement production are put into the rotary kiln to make cement;
[0029] 3) The gaseous product containing sulfur dioxide is indirectly dried on the gypsum by an isolated heater, and then sent to the sulfuric acid workshop to produce sulfuric acid. The gypsum in the isolated heater is stirred by a screw auger.
[0030] 4) The tail gas from the cement kiln is directly heated to the gypsum, then filtered and emptied.
Embodiment 2
[0032] A new method for preparing cement sulfuric acid from phosphogypsum, comprising steps:
[0033] 1) The gypsum and solid sulfur after being dried and mixed by the heater are put into the decomposition furnace to be heated and decomposed through the screw feeder. The heating temperature is 750°C, and the solid product calcium oxide and the gas product containing sulfur dioxide are obtained;
[0034] 2) The solid product calcium oxide and other raw materials required for cement production are put into the rotary kiln to make cement;
[0035] 3) The gaseous product containing sulfur dioxide is indirectly dried on the gypsum by an isolated heater, and then sent to the sulfuric acid workshop to produce sulfuric acid. The gypsum in the isolated heater is stirred by a screw auger.
[0036] 4) The exhaust gas from the cement kiln directly heats the gypsum and then is directly emptied after simple filtration. The exhaust gas from the cement kiln directly heats the gypsum in the pr...
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