A method for preparing calcium carbide by using yellow phosphorus tail gas and phosphogypsum
A technology for yellow phosphorus tail gas and phosphogypsum, which is applied in chemical instruments and methods, sulfur preparation/purification, inorganic chemistry, etc., can solve the problem of low utilization rate of thermal efficiency of phosphorus factory processes, high cost of secondary sewage treatment, and large energy consumption. and other problems, to achieve good environmental protection and economic benefits, improve resource utilization, and reduce production costs.
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Embodiment 1
[0021] This example describes a method for preparing calcium carbide using yellow phosphorus tail gas and phosphogypsum. The yellow phosphorus tail gas used is industrial waste gas produced during the high-temperature production of yellow phosphorus by an electric furnace method in a factory in Yunnan. The CO content is as high as 90%. The phosphogypsum used is It is the industrial solid waste produced in the production of wet-process phosphoric acid in a factory in Yunnan, of which CaSO 4 mH 2 The O content is as high as 95%, and the specific preparation method includes the following steps:
[0022] (1) Mix phosphogypsum and quicklime evenly to make the mixture pH = 7. Dry 100 parts of the standard mixture through a dryer at 105°C. After drying is complete, use a ball mill to pulverize for 5 minutes, and then the mixture is conveyed by the belt It is conveyed and lifted into the double-layer vibrating sieve to screen out the particles with a particle size of ≤40mm, and the r...
Embodiment 2
[0028] This example describes a method for preparing calcium carbide using yellow phosphorus tail gas and phosphogypsum. The yellow phosphorus tail gas used is industrial waste gas produced during the high-temperature production of yellow phosphorus by an electric furnace method in a factory in Yunnan. The CO content is as high as 95%. The phosphogypsum used is It is the industrial solid waste produced in the production of wet-process phosphoric acid in a factory in Yunnan, of which CaSO 4 mH 2 The O content is as high as 96%, and the specific preparation method includes the following steps:
[0029] (1) Mix phosphogypsum and quicklime evenly to make the pH of the mixture = 8. Dry 100 parts of the standard mixture through a dryer at 95°C. After the drying is complete, use a ball mill to pulverize it for 5 minutes, and then the mixture is made of The belt is conveyed and lifted and sent to the double-layer vibrating screen to screen out the particles with a particle size of ≤4...
Embodiment 3
[0035] This example describes a method for preparing calcium carbide using yellow phosphorus tail gas and phosphogypsum. The yellow phosphorus tail gas used is industrial waste gas produced during the high-temperature production of yellow phosphorus by an electric furnace method in a factory in Yunnan. The CO content is as high as 85%. The phosphogypsum used is It is the industrial solid waste produced in the production of wet-process phosphoric acid in a factory in Yunnan, of which CaSO 4 mH 2 The O content is as high as 92%, and the specific preparation method includes the following steps:
[0036] (1) Mix phosphogypsum and quicklime evenly to make the pH of the mixture = 9. Dry 100 parts of the standard mixture through a dryer at 115°C. After the drying is complete, use a pulverizer to pulverize for 5 minutes, and then the mixture The particles with a particle size of ≤40mm are screened out by the belt conveyor and sent to the double-layer vibrating screen, and the rest ar...
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Abstract
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