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

A sodium carbonate and alumina technology, applied in the chemical industry, can solve the problems of not being able to produce high-quality yellow phosphorus, not making full use of heat, and not conforming to yellow phosphorus enterprises, so as to achieve comprehensive production cost reduction, prominent energy saving effect, and reduced energy consumption. Effect

Active Publication Date: 2015-12-30
黄钰雪
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Problems solved by technology

This technical scheme realizes the production of phosphoric acid and the co-production of alkaline fertilizer at the same time, but it cannot produce high-quality yellow phosphorus, and does not make full use of the heat generated in the production process, which is not suitable for yellow phosphorus enterprises to reduce production energy consumption and improve the comprehensive utilization of tail gas and slag. rate of demand

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

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Experimental program
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Effect test

Embodiment 1

[0058] with P 2 o 5 Content is 23.19%, SiO 2 content of 21.82%, CaO content of 32.58%, K 2 O content is 2.51%, Na 2 Trace O content, CO 2 Potassium-containing phosphate rock (15-25mm) with a content of 3.96% and coke (3-25mm) with a fixed carbon content of 80% are added to the yellow phosphorus electric furnace according to the ratio of potassium-containing phosphate rock: coke diced = 1000:146.

[0059] According to the method of the present invention, 15kt / a yellow phosphorus production plant can produce yellow phosphorus 15kt annually, K 2 CO 3 4.7kt, Al 2 o 3 3.5kt. produced K 2 CO 3 Can be further processed to generate 9.25kt of KH 2 PO 4 .

Embodiment 2

[0061] with P 2 o 5 content of 20.5%, SiO 2 content of 22.2%, CaO content of 33.0%, K 2 O content is 1.89%, Na 2 O content is 0.44%, CO 2 Potassium-containing phosphate rock (15-25mm) with a content of 4.0% and coke (3-25mm) with a fixed carbon content of 80% are added to the yellow phosphorus electric furnace according to the ratio of potassium-containing phosphate rock: coke diced = 1000:131.5.

[0062] According to the method of the present invention, 10kt / a yellow phosphorus production plant can produce yellow phosphorus 10kt annually, K 2 CO 3 2.9kt, Al 2 o 3 2.6 kt, Na 2 CO 3 520t. produced K 2 CO 3 Can be further processed to generate 5.7kt KH 2 PO 4 .

Embodiment 3

[0064] with P 2 o 5 content of 19.5%, SiO 2 content of 21.9%, CaO content of 32.7%, K 2 O content is 2.29%, Na 2 O content is 0.15%, CO 2 Potassium-containing phosphate rock (15-25mm) with a content of 4.0% and coke (3-25mm) with a fixed carbon content of 80% are added to the yellow phosphorus electric furnace according to the ratio of potassium-containing phosphate rock: coke diced = 1000:126.

[0065] According to the method of the present invention, 20kt / a yellow phosphorus production plant can produce yellow phosphorus 20kt annually, K 2 CO 3 7.0kt, Al 2 o 3 5.5kt, Na 2 CO 3 360t. produced K 2 CO 3 It can be further processed to generate 13.8kt KH 2 PO 4 .

[0066] Compared with the existing potassium feldspar-lime sintering method, the aforementioned embodiments of the present invention can save energy and reduce consumption and CO 2 The emission reduction indicators are shown in Table 1:

[0067] Table 1

[0068]

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/027C01F7/02C01D7/00
CPCY02P20/10
Inventor 黄钰雪
Owner 黄钰雪
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