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Method for producing wet-process phosphoric acid and alpha hemihydrate phosphogypsum by using medium-grade phosphorite

A technology of phosphogypsum hemihydrate and wet-process phosphoric acid, which is applied in chemical instruments and methods, phosphorus compounds, calcium/strontium/barium sulfate, etc., can solve the problems of high gypsum impurity content, unsuitability for medium and low-grade phosphate rock production, and constraints Comprehensive utilization of phosphogypsum and other issues to achieve the effect of increasing energy consumption

Active Publication Date: 2019-02-01
ANHUI LIUGUO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional two-water method and one-step semi-hydrate process have low phosphorus yields, only about 94% and 92% respectively, and the high impurity content in gypsum severely restricts the comprehensive utilization of phosphogypsum; the semi-hydrate-dihydrate process has a high phosphorus yield 1. The quality of gypsum is good, but this process has high requirements for phosphate rock raw materials, which is not suitable for most enterprises to adopt. At the same time, what is obtained by this process is dihydrate gypsum, which increases the cost of comprehensive utilization
[0006] The two-step wet phosphoric acid process (semi-water-dihydrate process, dihydrate-semi-water process) is gradually emerging, of which the semi-water-dihydrate process has been industrialized in China, with high acid concentration, high phosphorus yield, The advantage of good energy-saving effect, but the problem is that the by-product is phosphogypsum dihydrate, which cannot be directly used with high added value
However, the dihydrate-semi-water process is currently limited to literature descriptions in China, and the research content is mainly to use high-grade ore powder as raw material, which is not suitable for the production of medium and low-grade phosphate rock.

Method used

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  • Method for producing wet-process phosphoric acid and alpha hemihydrate phosphogypsum by using medium-grade phosphorite
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  • Method for producing wet-process phosphoric acid and alpha hemihydrate phosphogypsum by using medium-grade phosphorite

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Step 1, 1# phosphate rock described in table 1 is ground into phosphate rock slurry (30wt.%H 2 O) and 98wt.% concentrated sulfuric acid are added continuously to the decomposition tank with the amount of 7.1t / h, 0.8t / h respectively, add simultaneously the ω (P 2 o 5 ) 32.7wt.% of dilute phosphoric acid and a mixture of primary washing liquid, and the three carry out the decomposition reaction of phosphate rock, wherein the phosphate rock slurry is converted into dry basis, and 98wt.% concentrated sulfuric acid is converted into pure H 2 SO 4 , dilute phosphoric acid converted into P 2 o 5 The mass ratio of the latter three is 1:0.16:1.6, and the process index of the control decomposition tank: temperature 80-85°C; free sulfate ion (SO 4 2- ) concentration of 10-20g / L; the solid content of the slurry is 25wt.%; the reaction time is 2.5-3h to obtain the phosphate ore decomposition mixed slurry.

[0035] Step 2, in step 1, mixed slurry (accounting for 47wt.%) carries...

Embodiment 2

[0046] Step 1, 2# phosphate rock described in table 1 is ground into phosphate rock slurry (30wt.%H 2 O) and 98wt.% concentrated sulfuric acid are added continuously to the decomposer with the amount of 8.6t / h, 2.1t / h respectively, add simultaneously the ω (P 2 o 5 ) 28wt.% of dilute phosphoric acid and a mixture of primary washing liquid, the three carry out the decomposition reaction of phosphate rock, wherein the phosphate rock slurry is converted into dry basis, and 98wt.% concentrated sulfuric acid is converted into H 2 SO 4 , dilute phosphoric acid converted into P 2 o 5 The mass ratio of the latter three is 1:0.32:1.3, and the technical indicators of the decomposition tank are controlled: temperature 80-85°C; free sulfate (SO 4 2- ) concentration of 10-20g / L; the solid content of the slurry is 25wt.%; the reaction time is 2.5-3h to obtain the phosphate ore decomposition mixed slurry.

[0047] Step 2, mixed slurry (accounting for 47wt.%) in step 1 carries out solid...

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Abstract

The invention relates to a method for producing wet-process phosphoric acid and alpha hemihydrate phosphogypsum by using medium-grade phosphorite. The method is an energy-saving low-consumption wet-process phosphoric acid production method. The method comprises the steps of decomposition reaction, solid-liquid separation, hemihydrate conversion reaction, and filtration and washing, and the high-concentration finished product phosphoric acid and the high-quality alpha hemihydrate phosphogypsum are obtained by controlling process parameters of the steps. The concentration of the obtained finished product phosphoric acid reaches 35-42 wt.%, omega(H2O) of the alpha hemihydrate phosphogypsum is in a range of 13-15% and omega(insoluble P2O5) is less than or equal to 0.1%. Through a grading technology, zero emission of the byproduct phosphogypsum is realized.

Description

technical field [0001] The invention belongs to the technical field of phosphate rock utilization, and in particular relates to a method for producing wet-process phosphoric acid and alpha hemihydrate phosphogypsum from medium-grade phosphate rock Background technique [0002] my country's phosphate rock reserves are abundant but not rich. The proven resource reserves are 17.6 billion tons of ore, and the basic reserves are 3.3 billion tons. However, the reserves of high-grade phosphate rock are low, P 2 o 5 The reserves of rich phosphorous ore with a content greater than 30wt.% are only 1.66 billion tons. As a non-renewable precious resource, phosphate rock has been listed as a strategic mineral in the "National Mineral Resources Planning (2016-2020)". [0003] The industrial by-product phosphogypsum of the wet phosphoric acid process, the main component is calcium sulfate, phosphoric acid is the basic raw material for the production of phosphorus chemical products, and 1...

Claims

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Application Information

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IPC IPC(8): C01B25/231C01F11/46C04B22/14
CPCC01B25/231C01F11/466C04B22/144
Inventor 郑之银沈浩朱英俊杨豹嶂雷云刘荣陈明彭克荣张俊刘清
Owner ANHUI LIUGUO CHEM CO LTD
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