Process for producing wet method phosphoric acid by medium low grade phosphorus mine

A wet-process phosphoric acid, low-grade technology, used in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of reduced quality of phosphogypsum, difficulty in comprehensive utilization, and low decomposition rate of phosphate rock, reducing waste of resources, Mitigate gradual exhaustion and reduce costs

Active Publication Date: 2006-06-28
SINOPEC NANJING ENG & CONSTR
View PDF0 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the characteristics of low- and medium-grade phosphate rocks is that the content of acid-insoluble impurities (A, I) is particularly high. When phosphoric acid is produced by traditional phosphoric acid production methods, almost all of it enters into phosphogypsum, which greatly reduces the quality of phosphogypsum, resulting in its Comprehensive utilization is difficult
Moreover, due to the

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for producing wet method phosphoric acid by medium low grade phosphorus mine

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example 1

[0040] Using this process technology, 80,000 tons / year P 2 o 5 The continuous test of industrial production of phosphoric acid has achieved good results as expected.

[0041] The specific process flow is: adding middle and low-grade phosphate rock into the multi-stage (3-stage) countercurrent extraction tank 1 arranged in steps, adding an excess concentration of 21.5% P 2 o 5 (WT) Phosphoric acid countercurrently decomposes phosphate rock, the liquid-solid ratio in the extraction slurry is 16.2, the reaction temperature is 75°C, and the total reaction time is 3h to generate calcium dihydrogen phosphate solution, which is combined with centrifugal sedimentation and vacuum filtration (centrifugal settler 2 adopt hydrocyclone, vacuum filter 3 adopt rotary table type vacuum filter, the same below) to carry out liquid-solid separation to remove residue to obtain extract clear liquid; in the reaction tank 4 with return slurry function, extract clear liquid and ...

Example Embodiment

[0057] Example 2

[0058] A small-scale continuous test of 1000 tons / year industrial production of phosphoric acid was carried out using this process technology with medium and low-grade phosphate rock in Yichang, Hubei (composition see Table 2) as raw material, and the expected good results were obtained.

[0059] The specific process flow is: adding middle and low-grade phosphate rock into the multi-stage (3-stage) countercurrent extraction tank 1 arranged in steps, adding an excess concentration of 22%P 2 o 5 (WT) Phosphoric acid countercurrently decomposes phosphate rock, controls the liquid-solid ratio in the extraction slurry = 16.3, the reaction temperature is 76 ° C, and the total reaction time is 3.2 hours to generate calcium dihydrogen phosphate solution. Solid separation removes the residue to obtain the extract clear liquid; in the square multi-grid reaction tank 4 with the slurry return function, the extract clear liquid is reacted with sulfuric acid, and the sul...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A process for preparing phosphoric acid from low-and medium-grade phosphorus ore by wet method includes such steps as countercurrent decomposing of P core by excessive phosphoric acid to generate the solution of calcium dihydrogen phosphate, liquid-solid separation to obtain liquid extract, reacting on sulfuric acid to obtain bihydrated calcium sulfate crystal and phosphoric acid solution, liquid-solid separation to obtain phosphoric acid and phosphogypsum, returning the most of phosphoric acid back to decomposing step, and using the rest as finished product.

Description

technical field [0001] The invention belongs to the field of phosphoric acid production, and relates to a process method for producing wet-process phosphoric acid by using medium and low-grade phosphorous rock. Background technique [0002] Wet-process phosphoric acid is the basic intermediate product of the phosphate compound fertilizer industry and the phosphate industry. It has a very important position and is in great demand. At present, the production of phosphoric acid at home and abroad is to use high-grade phosphate rock (there is no strict standard for the grade of phosphate rock, and the industry is traditionally divided into: high-grade: P 2 o 5 ≥30%, medium grade: 24%≤P 2 o 5 <30%, low grade :P 2 o 5 <24%. Enterprise standards stipulate that phosphate rock used for wet processing should be ≥ 28% P 2 o 5 . ), with the gradual depletion of rich phosphate ore mining, the production cost is gradually increasing, and the utilization of low- and medium-g...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B25/225
Inventor 孙国超龚建华杨林陈玉如
Owner SINOPEC NANJING ENG & CONSTR
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products