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A hydrogen sulfide microreactor and its preparation method, and a method for deeply removing arsenic and heavy metals from phosphoric acid solution

A technology of microreactor and phosphoric acid solution, which is applied in the direction of chemical instruments and methods, hydrogen sulfide, sulfur compounds, etc., can solve the problems of high cost, great harm of S, and low efficiency, and achieve less usage, low emission, and reduced The effect of cost of use

Active Publication Date: 2020-12-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The method for removing the arsenic component in the phosphoric acid solution in the prior art has high cost, low efficiency, H 2 Defects such as the great harm of S, the first purpose of the present invention is to provide a method that can slowly release highly active S 2- , and S 2- Utilize high, no H 2 S-hazardous hydrogen sulfide microreactor, especially suitable for deep removal of trace arsenic and heavy metal ions in phosphoric acid solution

Method used

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  • A hydrogen sulfide microreactor and its preparation method, and a method for deeply removing arsenic and heavy metals from phosphoric acid solution

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Utilize this process method to process certain industrial phosphoric acid, concrete steps are as follows: get a certain amount of industrial phosphoric acid (H 3 PO 4 content of 105%, arsenic content of 50ppm), take a certain amount of iron powder and sulfur and calcined under nitrogen protection at 300 ℃ to black solid particles, the molar ratio of iron powder and sulfur is 1.2, and the particle size of iron powder and sulfur are both less than 38 The micron accounts for 90%, and the prepared hydrogen sulfide microreactor is poured into the medium, the temperature is set at 85°C, the stirring speed is 150r / min, and the reaction is complete for one hour. The addition amount of the hydrogen sulfide microreactor is theoretically calculated value 3 times, after the reaction, filter to obtain a section of precipitated residue and a section of purified solution. Then wet magnetic separation is carried out on a section of precipitated slag to separate magnetic products and n...

Embodiment 2

[0050] Utilize this process method to process certain industrial phosphoric acid, concrete steps are as follows: get a certain amount of industrial phosphoric acid (H 3 PO 4 content of 109%, arsenic content of 85ppm), a certain amount of iron powder and sulfur were calcined under nitrogen protection at 500 ° C to black solid particles, the molar ratio of iron powder and sulfur was 1.2, and the particle size of iron powder and sulfur were both less than 38 The micron accounts for 90%, and the prepared hydrogen sulfide microreactor is poured into the medium, the temperature is set to 90°C, the stirring speed is 300r / min, and the reaction is complete for one hour. The addition amount of the hydrogen sulfide microreactor is the theoretical calculation value 2 times, after the reaction, filter to obtain a section of precipitated residue and a section of purified solution. Then wet magnetic separation is carried out on a section of precipitated slag to separate magnetic products an...

Embodiment 3

[0053] Utilize this process method to process certain industrial phosphoric acid, concrete steps are as follows: get a certain amount of industrial phosphoric acid (H 3 PO 4 content of 115%, arsenic content of 20ppm), a certain amount of iron powder and sulfur are calcined under nitrogen protection at 600 ℃ to black solid particles, the molar ratio of iron powder and sulfur is 1.5, and the particle size of iron powder and sulfur are both less than 38 The micron accounts for 90%. Pour the prepared hydrogen sulfide microreactor into the medium, set the temperature at 80°C, and the stirring speed is 150r / min, and fully react for one hour. The addition amount of hydrogen sulfide microreactor is theoretically calculated value 5 times, after the reaction, filter to obtain a section of precipitated residue and a section of purified solution. Then wet magnetic separation is carried out on a section of precipitated slag to separate magnetic products and non-magnetic products, and the ...

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Abstract

The invention discloses a sulfureted hydrogen micro reactor, a preparation method and a phosphoric acid solution deep arsenic and heavy metal removal method. The sulfureted hydrogen micro reactor is obtained through roasting excessive iron powder and sulphur in protection atmosphere. The arsenic-containing phosphoric acid solution is added into the sulfureted hydrogen micro reactor; S<2-> can be slowly released on the surface of the sulfureted hydrogen micro reactor; the S<2-> reacts with As<3+>, As<5+> and heavy metal ions in the phosphoric acid solution so as to reach the effects of deep purifying arsenic ions and heavy metal in the phosphoric acid solution. The method has the advantages that the removal efficiency of arsenic and heavy metal is high; the consumption of vulcanizing agentsis low; the release quantity of the sulfureted hydrogen is low, and the like. The problems of great consumption of vulcanizing agents in the conventional use process, low utilization rate, serious H2S danger and the like are solved. The method has the advantages that the process is simple; the operation is convenient; the industrial production requirements can be met.

Description

technical field [0001] The present invention relates to a hydrogen sulfide microreactor, in particular to a hydrogen sulfide microreactor obtained by calcining iron powder and sulfur at a high temperature, and also relates to a hydrogen sulfide microreactor used for deep dearsenization of industrial phosphoric acid solution or arsenic in phosphoric acid solution The invention discloses a method for deep purification of heavy metals and belongs to the technical field of inorganic chemical industry. Background technique [0002] As a basic chemical raw material, phosphoric acid is widely used in various fields such as medicine, chemical industry, and food. However, industrially produced phosphoric acid cannot be used in fields other than the chemical industry due to its high impurity content. Industrial thermal phosphoric acid is produced by burning industrial yellow phosphorus (P) through hydration, such as P 4 +5O 2 →P 4 o 10 ;P 4 o 10 +6H 2 O→4H 3 PO 4 , the arsen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/16C01B25/238
CPCC01B17/161C01B25/238
Inventor 孙伟胡岳华韩海生张荥斐王丽杨越
Owner CENT SOUTH UNIV