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Method for preparing ammonium fluorosilicate and coproducing white carbon black from fluorine-containing tail gases of phosphoric acid device

A technology of ammonium fluorosilicate and fluorosilicic acid, applied in the field of phosphorus chemical industry, can solve the problems of difficult waste disposal, low added value of products, low utilization rate of fluorine resources, etc., to reduce pollution, avoid chemical balance deviation, and ensure fluorine recovery. rate effect

Active Publication Date: 2018-05-08
HUBEI LIUGUO CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current treatment of fluorine resources in phosphoric acid plants, most of them are processed into sodium fluorosilicate for sale, but this processing method has disadvantages such as low utilization rate of fluorine resources, difficult waste disposal, and low added value of products.

Method used

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  • Method for preparing ammonium fluorosilicate and coproducing white carbon black from fluorine-containing tail gases of phosphoric acid device
  • Method for preparing ammonium fluorosilicate and coproducing white carbon black from fluorine-containing tail gases of phosphoric acid device

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The method for preparing ammonium fluorosilicate and co-producing white carbon black by utilizing fluorine-containing tail gas of a phosphoric acid plant comprises the following steps:

[0035] 1) Absorb the fluorine-containing tail gas with a phosphoric acid device with water to obtain a solution with a concentration of fluorosilicic acid above 10%; then add 10 wt% ammonia water for neutralization, stop adding ammonia water until the pH of the solution is 2, continue stirring for 20 minutes, and then discharge;

[0036] 2) The feed liquid obtained in step 1) is separated and filtered with a membrane filter press, the temperature of the feed liquid during the filtration process is controlled at 60-80° C., the filter residue is washed and dried to prepare white carbon black, and the filtrate is used for later use;

[0037] 3) The filtrate is evaporated and concentrated to a specific gravity of 1.2, then cooled, crystallized below 15°C, and finally filtered, and the obtain...

Embodiment 2

[0040] The method for preparing ammonium fluorosilicate and co-producing white carbon black by utilizing fluorine-containing tail gas of a phosphoric acid plant comprises the following steps:

[0041] 1) Use the mother liquor after ammonium fluorosilicate crystallization and filtration to absorb fluorine-containing tail gas from a phosphoric acid plant to obtain a solution with a concentration of 15% fluorosilicic acid; then add 10 wt% ammonia water for neutralization, and stop adding ammonia water until the pH of the solution is 2. Continue to stir for 20 minutes and discharge;

[0042] 2) The feed liquid obtained in step 1) is separated and filtered with a membrane filter press, the temperature of the feed liquid during the filtration process is controlled at 60-80° C., the filter residue is washed and dried to prepare white carbon black, and the filtrate is used for later use;

[0043] 3) The filtrate is evaporated and concentrated to a specific gravity of 1.21, then cooled...

Embodiment 3

[0046] The method for preparing ammonium fluorosilicate and co-producing white carbon black by utilizing fluorine-containing tail gas of a phosphoric acid plant comprises the following steps:

[0047] 1) Use the mother liquor after ammonium fluorosilicate crystallization and filtration to absorb fluorine-containing tail gas from a phosphoric acid plant to obtain a solution with a concentration of 13% fluorosilicic acid; then add 15 wt% ammonia water for neutralization, and stop adding ammonia water until the pH of the solution is 3. Continue to stir for 25 minutes before discharging; 2) The feed liquid obtained in step 1) is separated and filtered with a diaphragm filter press, the temperature of the feed liquid during the filtration process is controlled at 70-80°C, and the filter residue is washed and dried to prepare white carbon black , the filtrate is standby;

[0048] 3) The filtrate is evaporated and concentrated to a specific gravity of 1.21, then cooled, crystallized be...

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Abstract

The invention discloses a method for preparing ammonium fluorosilicate and coproducing white carbon black from fluorine-containing tail gases of a phosphoric acid device. The method comprises the following steps: 1) absorbing the fluorine-containing tail gases of the phosphoric acid device by using water or a solution to obtain a solution of which the fluosilicic acid concentration is 9% or more;then, adding ammonia water to neutralize the solution until the pH of the solution is 2 or more, then, stopping adding the ammonia water, carrying out uniform stirring and mixing, and then, discharging the solution; 2) filtering the solution obtained in the step 1), washing and drying the filter residue to prepare white carbon black, and reserving the filtrate for later use; and 3) performing evaporating concentration on the filtrate to a saturated state, and then, carrying out cooling crystallization and filtration to obtain a filter residue, namely ammonium fluorosilicate. By using the method, not only is the treatment problem of the fluorine-containing tail gases solved, but also the utilization value of a fluorine-containing resource is increased, the application field of the fluorine-containing resource is widened, and the social and economic benefits are remarkably increased.

Description

technical field [0001] The invention belongs to the field of phosphorus chemical industry and relates to the utilization of fluorine-containing waste gas in phosphorus chemical industry, in particular to a method for preparing ammonium fluorosilicate and co-producing white carbon black by utilizing fluorine-containing tail gas of a phosphoric acid plant. Background technique [0002] Ammonium fluorosilicate, also known as ammonium hexafluorosilicate, is a highly soluble and active salt among fluorosilicates, so it can be used as an intermediate raw material for the production of various fluorides. Ammonium fluorosilicate itself is also used as a disinfectant in the brewing industry, a glass etchant, a mothproof agent for textiles, and a wood preservative. It is also used for light metal casting, electroplating, and for extracting potassium from green sand and making artificial Cryolite and ammonium chlorate etc. [0003] In the current treatment of fluorine resources in pho...

Claims

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Application Information

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IPC IPC(8): C01B33/10C01B33/12
CPCC01B33/103C01B33/12
Inventor 盛昌和王东波陈宇朱惠民
Owner HUBEI LIUGUO CHEM IND
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