Method for comprehensively utilizing tail gas of sludge phosphorus-prepared sodium hypophosphite

A technology of sodium hypophosphite and sodium hypochlorite solution, applied in the directions of hypophosphorous acid, phosphorus oxyacid, separation method, etc., can solve the problems of long process, high risk, environmental pollution, etc., and achieves improved absorption efficiency, good gas scrubbing effect, The effect of high absorption efficiency

Inactive Publication Date: 2010-02-24
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0011] However, the disadvantage of this method is that it produces tail gas containing phosphine, and the concentration of phosphine in the tail gas can reach more than 50%.
The disadvantage of this method is that the process is too long, the device occupies a large area, and most of them are manually operated, which is more dangerous; in addition

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  • Method for comprehensively utilizing tail gas of sludge phosphorus-prepared sodium hypophosphite
  • Method for comprehensively utilizing tail gas of sludge phosphorus-prepared sodium hypophosphite
  • Method for comprehensively utilizing tail gas of sludge phosphorus-prepared sodium hypophosphite

Examples

Experimental program
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Example Embodiment

[0029] Example one

[0030] Take 21.03g of mud phosphorus from Kunyang Phosphorus Fertilizer Plant with an average phosphorus content of 33.1%, containing about 6.98g of phosphorus, according to the ratio of water to phosphorus 105:1, alkali to phosphorus ratio 3.5:1, and the ratio of sodium hydroxide to calcium hydroxide is Enter the reactor at 5:1, control the temperature at 85°C for reaction, and the carrier gas nitrogen flow rate is 20mL / min.

[0031] The scrubbing liquid is 80% concentrated phosphoric acid;

[0032] Fill the primary absorption tube with 100 mL of 0.75% NaClO solution, pH=9;

[0033] Fill the secondary absorption tube with 100 mL of 7% NaClO solution, pH=9;

[0034] Fill the tertiary absorption tube with 100 mL of 7% NaClO solution, pH=13;

[0035] Put 80.01g of modified activated carbon in the adsorption tube.

[0036] The results of the absorption test are as follows:

[0037] Table 1 Absorption test results

[0038] test results

[0039] The results of the adsor...

Example Embodiment

[0042] Example two

[0043] Take 19.68g of mud phosphorus from Kunyang Phosphorus Plant with an average phosphorus content of 45.1%, containing about 8.87g of phosphorus, according to the ratio of water to phosphorus 105:1, alkali to phosphorus ratio 3.5:1, sodium hydroxide and calcium hydroxide The ratio of 5:1 enters the reactor and reacts at a temperature of 80°C, and the nitrogen carrier gas flow rate is 25 mL / min.

[0044] The scrubbing liquid is 85% concentrated phosphoric acid;

[0045] Fill the primary absorption tube with 100 mL of 0.75% NaClO solution, pH=9;

[0046] Fill the secondary absorption tube with 100 mL of 7% NaClO solution, pH=9;

[0047] Fill the tertiary absorption tube with 100 mL of 7% NaClO solution, pH=13;

[0048] 90.21g modified activated carbon is placed in the adsorption tube.

[0049] The results of the absorption test are as follows:

[0050] Table 3 Absorption test results

[0051] test results

[0052] The results of the adsorption test are as follows...

Example Embodiment

[0055] Example three

[0056] Take 22.84g of sludge phosphorus from Kunyang Phosphorus Plant with a phosphorus content of 35.6%, with a phosphorus content of about 8.13g, according to the water-to-phosphorus ratio 105:1, the alkali-phosphorus ratio 3.5:1, and the ratio of sodium hydroxide and calcium hydroxide It is 5:1 into the reactor and reacts at a temperature of 90°C, and the nitrogen carrier gas flow rate is 40 mL / min.

[0057] The scrubbing liquid is 90% concentrated phosphoric acid;

[0058] Fill the primary absorption tube with 100 mL of 0.75% NaClO solution, pH=9;

[0059] Fill the secondary absorption tube with 100 mL of 7% NaClO solution, pH=9;

[0060] Fill the tertiary absorption tube with 100 mL of 7% NaClO solution, pH=13;

[0061] 99.83g of modified activated carbon is placed in the adsorption tube.

[0062] The results of the absorption test are as follows:

[0063] Table 5 Absorption test results

[0064] test results

[0065] The results of the adsorption test are a...

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Abstract

The invention relates to a method for comprehensively utilizing and processing tail gas of sludge phosphorus-prepared sodium hypophosphite, belonging to the technical field of chemical engineering andenvironmental protection. The process flow thereof is as follows: (1) after the phosphine tail gas of the sludge phosphorus-prepared sodium hypophosphite is collected, particle impurities in the tailgas are rinsed and eliminated by phosphoric acid solution under the condition that nitrogen is used as protective carrier gas; (2)the impurified tail gas is eliminated sequentially enters a three-grade absorption device adopting sodium hypochlorite solution as absorption solution so that the product of sodium hypophosphite can be obtained; and (3) the phosphine which still exists in the absorbedtail gas is adsorbed by modified activated carbon, and then is emitted outside after reaching the emission standard. The method of the invention is economical and practical, can recycle and convert the phosphine in the tail gas into the product of sodium hypophosphite with high added value, and greatly reduces environmental pollution caused by the tail gas.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing and treating sludge phosphorus to produce sodium hypophosphite tail gas, belonging to the technical fields of chemical industry and environmental protection. Background technique [0002] my country is a large phosphorus-producing country. In the past 20 years, the development of the phosphorus chemical industry has occupied an important position in the overall layout of the international phosphorus chemical industry, and has made great contributions to the development and prosperity of the social economy. [0003] At present, most of the domestic yellow phosphorus production enterprises adopt the process technology of producing yellow phosphorus in the electric furnace method. This process is to place the mixture of phosphate rock, silica and coke in a closed three-phase electric furnace, and reduce it at a high temperature of 1400 ° C to 1500 ° C. The solid waste (commonly known as mud p...

Claims

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Application Information

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IPC IPC(8): B01D53/74B01J20/32B01J20/20C01B25/165
Inventor 黄小凤胡若鹏宁平谭娟李凌宜刘伟文
Owner KUNMING UNIV OF SCI & TECH
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