Phosphorous slag pulverizing system

Abstract

The invention relates to a phosphorous slag pulverizing system. The phosphorous slag pulverizing system comprises a phosphorous slag feeding device, a phosphorous slag pulverizing device and a discharging device; the phosphorous slag feeding device is connected with the phosphorous slag pulverizing device; the discharging device is connected with the phosphorous slag pulverizing device; the phosphorous slag pulverizing device comprises a vertical mill and a hot blast furnace; the vertical mill is connected with the phosphorous slag feeding device; the hot blast furnace is connected with an air inlet of the vertical mill; and fuel of the hot blast furnace is tail gas of a yellow phosphorous production line. According to the phosphorous slag pulverizing system, phosphorous slag is pulverized through the vertical mill; and the land area occupied by the vertical mill is small, and the land utilizing efficiency is improved. Besides, the tail gas generated by the yellow phosphorous production line serves as the fuel of the hot blast furnace so that the hot blast furnace can generate hot air, or waste gas generated by the system is used for drying the phosphorous slag in the vertical mill, not only is the waste gas reused, but also the water content of the phosphorous slag is reduced, the grindability and abradability of the phosphorous slag are improved, the electric consumption of the whole system can be controlled at 42 kWh / ton, the production efficiency is improved, and the yield is increased.

Description

technical field [0001] The invention relates to the technical field of waste slag grinding produced in a yellow phosphorus production line, in particular to a phosphorus slag grinding system and a production method thereof. Background technique [0002] Phosphorus slag is a solid industrial waste produced during the production of yellow phosphorus, and its chemical composition is: CaO: 47-52%, SiO 2 : 40-43%, P 2 o 5 : 0.8-2.5%, Al 2 o 3 : 2-5%, Fe 2 o 3 : 0.8-3.0%, F: 2.5-3%, the potential mineral phases are pseudo wollastonite, lancetite and a small amount of apatite. About 90% of its structure is vitreous body. For every ton of yellow phosphorus produced by the electric furnace method, 8-10 tons of phosphorus slag is produced as a by-product. At present, my country's phosphorus reserves are relatively large, and most of them are concentrated in Yunnan, Guizhou and Sichuan, etc. Province, the utilization rate of waste slag is not high, and a large amount of waste is ...

AI Technical Summary

Problems solved by technology

About 90% of its structure is vitreous body. For every ton of yellow phosphorus produced by the electric furnace method, 8-10 tons of phosphorus slag is produced as a by-product. At present, my country's phosphorus reserves are relatively large, and most of them are concentrated in Yunnan, Guizhou and Sichuan, etc. Province, the utilization rate of waste slag is not high, and a large amount of waste is piled up in the sky, which not only occupies a large amount of land, but also the P in phosphorus slag 2 o 5 and other harmful elements will seep into the ground in rainwater, causing water pollution and soil pollution. Therefore, the comprehensive utilization of yellow phosphorus waste residue is an urgent problem to be solved at present.

[0003] At present, the effective treatment method is to grind the phosphorus slag finely, then add it to cement, and use it as a mixture in the concrete industry. In the prior art, the phosphorus slag grinding equipment mainly uses dryers and ball mills, and the phosphorus slag is firstly dried. Finally, it is sent to a ball mill to make a finished product. However, due to the large water content of phosphorus slag, the wearability and abrasiveness are also very poor. If the dryer and ball mill system are used for drying and grinding, the power consumption of the system is as high as 80KMh / t, and the processing is small, it is difficult to meet the needs of a large amount of waste residue grinding

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