Energy-saving method for preparing yellow phosphorus, sylvite, sodium carbonate and aluminum oxide through potassium-bearing phosphorite

Abstract

The invention relates to an energy-saving method for preparing yellow phosphorus, sylvite, sodium carbonate and aluminum oxide through potassium-bearing phosphorite. The method comprises the steps that the potassium-bearing phosphorite and coke nuts are added into a yellow phosphorus electric furnace to be reacted to obtain furnace gas containing P2; washing is conducted on the furnace gas, crude phosphorous is collected, refining is conducted, and high quality yellow phosphorus is obtained; water quenching is conducted on yellow phosphorus slags, the slags are removed, KAlO2 is dissolved out, filtration is conducted, Al(OH)3 is settled after CO2 is added, and water quench filtrate is obtained. The Al(OH)3 is converted through temperature control to obtain Al2O3, crystal separation and drying are conducted on the water quench filtrate, and K2CO3 and Na2CO3 are obtained. According to the energy-saving method for preparing the yellow phosphorus, the sylvite, the sodium carbonate and the aluminum oxide through the potassium-bearing phosphorite, series of problems that for a traditional electrothermal method that the potassium-bearing phosphorite is used for producing the yellow phosphorus through the yellow phosphorus electric furnace, the reaction is complex, the efficiency is low, furnace ore is unstable, and the benefit is poor are solved; compared with preparing K2CO3 through a traditional orthoclase sintering method, a high-temperature melting method, a hydrothermal method, a blast furnace smelting method and a low-temperature decomposition method, the energy consumption, material consumption and production cost can be greatly reduced, product profit margins are improved, and meanwhile environmental pollution is reduced.

Description

technical field

[0001] The invention relates to the field of chemical industry, in particular to an energy-saving method for preparing yellow phosphorus, potassium salt, sodium carbonate and alumina from potassium-containing phosphate rock. Background technique

[0002] Potassium-bearing phosphate ore is a kind of marine sedimentary potassium-containing phosphate ore deposit mainly composed of terrigenous clastics. It is mainly distributed in Hanyuan to Ganluo in Sichuan, around Dianchi Lake in Yunnan, Yichang in Hubei and other places.

[0003] Sichuan Hanyuan type potassium-containing phosphate rocks are mainly distributed in Hanyuan Wanli, Shirong, Shuitonggou, Ganluoxinjigu, Tianba, Mawogou and other areas. The potassium-bearing phosphorite strata belong to the lower part of the Qiongzhusi Formation. The phosphorous rock series is 40-50 meters thick. It consists of a set of argillaceous, dolomite-cemented phosphorus-bearing siltstones and claystones deposited in nerit...

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