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Method for treating yellow phosphorus production device phosphorus furnace gas condensate bled steam and recycling SiF4

A technology for condensing spent steam and producing equipment, applied in the field of phosphorus chemical industry, can solve problems such as not taking into account and not meeting environmental protection requirements, and achieve the effects of comprehensive utilization of environmental protection resources, low investment and short process flow

Active Publication Date: 2016-01-27
黄钰雪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this technical solution does not take into account the H produced in the production process 2 SiF 6 , the discharged sewage will produce SiF-containing 4 The diffuse type of exhaust steam, so it does not meet the requirements of environmental protection
At present, there is no relevant information about the recovery of SiF from phosphorus furnace gas condensate water. 4 Simultaneous Treatment of Phosphorus Furnace Gas Condensate and Lack of Steam

Method used

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  • Method for treating yellow phosphorus production device phosphorus furnace gas condensate bled steam and recycling SiF4
  • Method for treating yellow phosphorus production device phosphorus furnace gas condensate bled steam and recycling SiF4

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The electric furnace capacity of a yellow phosphorus factory is 2×20000KVA, with P 2 o 5 content of 29%, SiO 2 Phosphate ore with a content of 13% and an F content of 1.5% is combined with coking coal and silica to produce yellow phosphorus. The acidity of yellow phosphorus slag is calculated according to 0.8, and the ratio of entering the furnace is phosphorite: coke: silica = 1000:163:190, with an annual output of 20,000 tons of yellow phosphorus. The phosphorus furnace gas condensate in the production process is discharged into the hot water tank from the phosphorus tank for natural cooling, and then pumped to the scrubber tower in the hot section for condensation, and the excess condensate is directly discharged into the circulating sewage tank. The exhausted steam is not treated and silicon tetrafluoride is not recovered, which leads to the dispersion of exhausted steam in hot water tanks and circulating sewage pools, causing serious environmental pollution.

[...

Embodiment 2

[0058] The capacity of an electric furnace in a yellow phosphorus factory is 1×31500+1×35000KVA, with P 2 o 5 Content is 31%, SiO 2 Phosphorus concentrate pellets with a content of 13% and an F content of 1.75% are combined with coking coal and silica to produce yellow phosphorus. The acidity of yellow phosphorus slag is calculated according to 0.8, and the ratio of entering the furnace is phosphorus concentrate pellets: coke: silica = 1000:177:189, with an annual output of 35,000 tons of yellow phosphorus. The phosphorus furnace gas condensate in the production process is discharged into the hot water tank from the phosphorus tank for natural cooling, and then pumped to the scrubber tower in the hot section for condensation, and the excess condensate is directly discharged into the circulating sewage tank. The exhausted steam is not treated and silicon tetrafluoride is not recovered, which leads to the dispersion of exhausted steam in hot water tanks and circulating sewage ...

Embodiment 3

[0062] The electric furnace capacity of a large yellow phosphorus enterprise is 8×20000KVA, with P 2 o 5 content of 25%, SiO 2 Phosphate ore and coking coal with a content of 28% and a F content of 1.5% produce yellow phosphorus. The acidity of yellow phosphorus slag is calculated as 0.83, and the ratio of entering the furnace is phosphate rock: coke diced = 1000:152, with an annual output of 80,000 tons of yellow phosphorus. The phosphorus furnace gas condensate in the production process is discharged into the hot water tank from the phosphorus tank for natural cooling, and then pumped to the scrubber tower in the hot section for condensation, and the excess condensate is directly discharged into the circulating sewage tank. The exhausted steam is not treated and silicon tetrafluoride is not recovered, which leads to the dispersion of exhausted steam in hot water tanks and circulating sewage pools, causing serious environmental pollution.

[0063] According to the method o...

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Abstract

The invention relates to a method for treating yellow phosphorus production device phosphorus furnace gas condensate bled steam and recycling SiF4. The method comprises steps as follows: a yellow phosphorus device phosphorus furnace gas condensation hot-water tank is replaced by a fluorosilicic acid circulating concentration tank, condensate water is subjected to heat exchange through a heat exchanger 1 and a heat exchanger 2 and then used for condensing hot section and cold section scrubber towers respectively, cold water supplement is performed for making up water loss, and SiF4 in phosphorous furnace gas is fully absorbed by water in the scrubber towers to produce H2SiF6; the H2SiF6 is filtered after reaching the standard concentration, NaCl is added, and Na2SiF6 is precipitated and separated; slaked lime is added to a filtrate after precipitation and separation for neutralization, and CaCl2 is obtained after precipitation and separation; the rest condensate water is subjected to heat exchange through a heat exchanger 3 and then returns to the cold section scrubber tower for condensation. Heat obtained by the heat exchangers 1-3 is used for drying Na2SiF6 and CaCl2. With the adoption of the method, the yellow phosphorus production device phosphorus furnace gas condensate bled steam is treated, SiF4 is recycled, scrubbing waste heat can be utilized comprehensively, and the win-win effect of environmental protection treatment and comprehensive utilization of resources is realized.

Description

technical field [0001] The invention relates to the field of phosphorus chemical industry, in particular to a method for treating the condensed waste steam of phosphorus furnace gas in a yellow phosphorus production device and recycling silicon tetrafluoride. Background technique [0002] Yellow phosphorus is widely used in the preparation of high-purity phosphoric acid and phosphate, and is also used in the preparation of red phosphorus (red phosphorus), tetraphosphorus trisulfide (P 4 S 3 ), organic phosphates, condensing agents, pesticides, etc., are essential products for people's daily life, national economy and military industry. [0003] The existing domestic yellow phosphorus is mainly produced by the electric furnace method. Such as figure 1 Shown is the main process flow chart of a typical domestic yellow phosphorus production system. The phosphorus furnace gas generated by the reaction of phosphate rock, silica and coke in the yellow phosphorus device is intro...

Claims

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Application Information

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IPC IPC(8): C01B33/10C01F11/24
CPCY02P20/129
Inventor 黄钰雪唐影黄椿桀黄光华
Owner 黄钰雪
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