Production device and method for co-production of alpha-semi-hydrated gypsum by two-step wet-process phosphoric acid

A technology of hemihydrate gypsum and wet-process phosphoric acid, which is applied in the fields of chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of complex preparation procedures of α-hemihydrate gypsum, low utilization rate of phosphogypsum resources, and concentrated dihydrate acid Low-level problems, to achieve the effect of saving steam consumption, remarkable energy-saving effect, and good quality

Active Publication Date: 2021-05-28
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of production device and method thereof of two-step method wet-process phosphoric acid coproduction α-hemihydrate gypsum, adopt two-step method to further improve the P in phosphoric acid 2 o 5 At the same time, through the recrystallization process, co-production of α-hemihydrate gypsum is not required, which solves the problems of low utilization rate of phosphogypsum resources, low concentration of dihydrate acid, and complicated preparation procedures of α-hemihydrate gypsum

Method used

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  • Production device and method for co-production of alpha-semi-hydrated gypsum by two-step wet-process phosphoric acid
  • Production device and method for co-production of alpha-semi-hydrated gypsum by two-step wet-process phosphoric acid
  • Production device and method for co-production of alpha-semi-hydrated gypsum by two-step wet-process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 Shown is a production device for two-step wet process phosphoric acid coproduction α-hemihydrate gypsum, comprising successively connected filter press 1, 1# resizing tank 2, 1# reaction tank 3 and vacuum filter 4, vacuum The phosphogypsum outlet of the filter 4 is connected to the gypsum re-slurry tank 5, the slag acid outlet at the bottom of the vacuum filter 4 is connected to the 1# reaction tank 3, the filtrate outlet of the vacuum filter 4 is connected to the dilute acid back-acid tank 6, and the dilute acid back-acid tank 6 The dilute acid outlet is connected to 2# reaction tank 7 and 2# re-slurry tank 8 in turn, and 2# re-slurry tank 8 is connected to filter press 1; the reaction slurry outlet of 2# reaction tank 7 is connected to 1# belt filter 9 connections, 1# belt filter 9 filtrate outlet is connected to dilute acid clarification tank 10, 1# belt filter 9 phosphogypsum outlet is connected to slurry mixing tank 11, 3# reaction tank 12, 2# belt filter ...

Embodiment 2

[0039] (1) Use the filter press 1 to dehydrate the phosphate rock slurry, so that its water content is controlled at 20%, to obtain a press filter cake. The obtained press filter 2 / 3 pulp is sent to 1# reslurry tank 2, and 1 / 3 press filter cake is sent to 2# reslurry tank 8.

[0040] (2) Transport the ore pulp obtained from 1# re-slurry tank 2 to 1# reaction tank 3, and add concentrated sulfuric acid (concentration 98% sulfuric acid). control slurry P 2 o 5 The mass concentration is 23.5%, SO 4 2- The mass concentration is 25 mg / L, the solid content of the slurry is 31%, and the reaction temperature is 80° C. to obtain dihydrate phosphogypsum slurry a.

[0041] (3) dihydrate phosphogypsum slurry a is pumped to vacuum filter 4 for vacuum filtration, and the dilute phosphoric acid (P 2 o 5 Mass concentration 23%) is transported to dilute acid return acid tank 6 as system acid return, transported to 2# reaction tank 7 and 2# re-sizing tank 8 for use as pulping, and the slag...

Embodiment 3

[0049] (1) Use the filter press 1 to dehydrate the phosphate rock slurry, so that its water content is controlled at 20%, to obtain a press filter cake. 2 / 3 of the obtained press filter cake is delivered to 1# resizing tank 2, and 1 / 3 of the press filter cake is delivered to 2# resizing tank 8.

[0050] (2) Transport the ore pulp obtained from 1# re-slurry tank 2 to 1# reaction tank 3, and add concentrated sulfuric acid (concentration 98% sulfuric acid). control slurry P 2 o 5 The mass concentration is 24.5%, SO 4 2- The mass concentration is 30 mg / L, the solid content of the slurry is 31%, and the reaction temperature is 80° C. to obtain dihydrate phosphogypsum slurry a.

[0051] (3) dihydrate phosphogypsum slurry a is pumped to vacuum filter 4 for vacuum filtration, and the dilute phosphoric acid (P 2 o 5 Mass concentration 23%) is transported to dilute acid return acid tank 6 as system acid return, transported to 2# reaction tank 7 and 2# re-sizing tank 8 for use as p...

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Abstract

The invention discloses a production device and method for co-production of alpha-semi-hydrated gypsum by two-step wet-process phosphoric acid, and relates to the technical field of wet-process phosphoric acid byproduct semi-hydrated gypsum. The device comprises a filter press, a 1 # re-slurry tank, a 1 # reaction tank and a vacuum filter which are sequentially connected; a phosphogypsum outlet of the vacuum filter is connected with a gypsum re-slurry tank, a sludge acid outlet in the bottom of the vacuum filter is connected with the 1 # reaction tank, a filtrate outlet of the vacuum filter is connected with a dilute acid return tank, and a dilute acid outlet of the dilute acid return tank is sequentially connected with a 2 # reaction tank and a 2 # re-slurry tank; the 2 # re-slurry tank is connected with the filter press; a reaction slurry outlet of the 2 # reaction tank is connected with a 1 # belt filter, a filtrate outlet of the 1 # belt filter is connected with a dilute acid clarifying tank, an ardealite outlet of the 1 # belt filter is sequentially connected with a slurry mixing tank, a 3 # reaction tank and the 2 # belt filter, and a filter residue outlet of the 2 # belt filter is sequentially connected with a belt conveyor, a dryer and a semi-hydrated gypsum silo. While high-concentration phosphoric acid is produced, alpha-semi-hydrated gypsum is produced as a byproduct.

Description

technical field [0001] The invention relates to the technical field of wet-process phosphoric acid by-product hemihydrate gypsum, in particular to a two-step wet-process phosphoric acid co-production α-hemihydrate gypsum production device and a method thereof. Background technique [0002] At present, domestic phosphoric acid production enterprises mainly use dihydrate method, semi-hydrate method, dihydrate-half water method and other processes to produce phosphoric acid. The dihydrate method is currently adopted by most phosphoric acid production enterprises. The technical route of this process is relatively mature, and the localization of large-scale equipment has basically been realized. However, due to the decline in the quality of most domestic phosphate rocks, dihydrate wet-process phosphoric acid P 2 o 5 The mass concentration is low, generally between 21% and 23%. In order to obtain higher-quality phosphoric acid, in most cases, it must be concentrated and purified...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/231
CPCC01B25/231
Inventor 朱桂华何宾宾魏立军朱剑峰欧志兵张卫红姜威彭桦龚丽聂鹏飞
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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