Method for producing phosphoric acid and gypsum whiskers by wet process

A technology for gypsum whiskers and wet-process phosphoric acid, applied in the field of producing gypsum whiskers, can solve the problems of slow speed, complicated separation process of phosphoric acid, short reaction time, etc., and achieves the effects of reducing production cost, shortening reaction time and no environmental pollution

Inactive Publication Date: 2012-01-04
江苏瑞和化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of the wet-process phosphoric acid co-production of gypsum whiskers in the prior art, which directly utilizes phosphorite ore to react with acid solution, the reaction time is long, the speed is slow, the production efficiency is low, and the process of separating phosphoric acid from the mixed acid solution after filtering the gypsum whiskers is compli

Method used

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  • Method for producing phosphoric acid and gypsum whiskers by wet process
  • Method for producing phosphoric acid and gypsum whiskers by wet process

Examples

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Embodiment 1

[0019] A method for wet-process phosphoric acid coproduction of gypsum whiskers, comprising the following steps:

[0020] (1) Add excess phosphate rock slurry and hydrochloric acid to the reaction tank, react for 5 minutes under stirring, and precipitate for 30 minutes under static state to form a mixture of calcium dihydrogen phosphate, calcium chloride and phosphoric acid, calcium dihydrogen phosphate naturally precipitates, calcium chloride The mixture with phosphoric acid floats on the upper layer in the form of clear liquid; the moisture content of the phosphate rock slurry is 30%, and the fineness of the phosphate rock powder in the phosphate rock slurry is -100 mesh 60%; the content of the hydrochloric acid is 7%;

[0021] (2) The clear liquid in the step (1) is input into the settling tank through the delivery pump, and the impurities are removed through mechanical filtration to enter the clear liquid pool, and the clear liquid in the clear liquid pool is input into the...

Embodiment 2

[0029] A method for wet-process phosphoric acid coproduction of gypsum whiskers, comprising the following steps:

[0030] (1) Add excess phosphate rock slurry and hydrochloric acid to the reaction tank, react for 20 minutes under stirring, and precipitate for 60 minutes under static state to form a mixture of calcium dihydrogen phosphate, calcium chloride and phosphoric acid, calcium dihydrogen phosphate naturally precipitates, calcium chloride The mixture with phosphoric acid floats on the upper layer in the form of clear liquid; the moisture content of the phosphate rock slurry is 40%, and the fineness of the phosphate rock powder in the phosphate rock slurry is -100 mesh 80%; the content of the hydrochloric acid is 25%;

[0031] (2) The clear liquid in the step (1) is input into the settling tank through the delivery pump, and the impurities are removed through mechanical filtration to enter the clear liquid pool, and the clear liquid in the clear liquid pool is input into t...

Embodiment 3

[0039] A method for wet-process phosphoric acid coproduction of gypsum whiskers, comprising the following steps:

[0040](1) Add excess phosphate rock slurry and hydrochloric acid to the reaction tank, react for 30 minutes under stirring, and precipitate for 90 minutes under static state to form calcium dihydrogen phosphate, calcium chloride and phosphoric acid mixture, calcium dihydrogen phosphate naturally precipitates, calcium chloride The mixture with phosphoric acid floats on the upper layer in the form of clear liquid; the moisture content of the phosphate rock slurry is 45%, and the fineness of the phosphate rock powder in the phosphate rock slurry is -100 mesh 90%; the content of the hydrochloric acid is 36%;

[0041] (2) The clear liquid in the step (1) is input into the settling tank through the delivery pump, and the impurities are removed through mechanical filtration to enter the clear liquid pool, and the clear liquid in the clear liquid pool is input into the cle...

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Abstract

The invention discloses a method for producing phosphoric acid and gypsum whiskers by a wet process, which is used in combination with a wet-process phosphoric acid production device. The method comprises: reacting hydrochloric acid with excessive phosphorus ore pulp to form calcium chloride solution containing hydrochloric acid; reacting the calcium chloride solution with solution of sulfuric acid to obtain a suspended matter; filtering, washing and obtaining dihydrate gypsum whiskers; and heating filtrate, cooling, and absorbing, wherein hydrogen chloride is circularly used, phosphoric acidis purified to be used for producing a phosphate product.

Description

technical field [0001] The invention relates to a method for producing gypsum whiskers, in particular to a method for simultaneously producing phosphoric acid and gypsum whiskers during wet phosphoric acid processing. Background technique [0002] In the production of traditional wet-process phosphoric acid, medium and high-quality phosphate rocks are used, while low-grade phosphate rocks cannot be used, and 3-5 tons of industrial waste phosphogypsum is discharged for every 1 ton of phosphoric acid produced. A large amount of by-product phosphogypsum pollutes the environment and wastes Phosphate ore resources; the existing utilization of phosphate ore to co-produce gypsum whiskers, such as the disclosed method of manufacturing gypsum whiskers in phosphoric acid in 200410024348.0 as patent No. The surface area is small, the reaction time is long and the speed is slow, and it is difficult to improve the production efficiency in large-scale production; a large amount of mixed a...

Claims

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Application Information

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IPC IPC(8): C01B25/22C30B29/10C30B29/62
Inventor 刘圣林沙德宏陆富生洪建华
Owner 江苏瑞和化肥有限公司
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