Method for producing feed-grade wet-process purified phosphoric acid and high-purity high-whiteness semi-hydrated gypsum

A technology of wet purification and hemihydrate gypsum, which is applied in chemical instruments and methods, inorganic chemistry, organic fertilizers, etc., can solve the problems of high impurity content of ordinary hemihydrate gypsum and reduction of common Problems such as the scope of phosphogypsum utilization, to achieve the effects of low phosphorus content, reduced storage and treatment costs, and reduced energy consumption

Active Publication Date: 2016-12-07
SINOCHEM YUNLONG
View PDF6 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The disadvantages of the above two techniques are: (1) the wet-process phosphoric acid products produced by the two techniques are not purified or purified, and the impurities such as iron, aluminum, magnesium, and fluorine are high in content, and cannot be directly applied to Production of Feed Grade Phosphate Products
(4) The latter process converts 30-50% of the calcium in the phosph

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
  • Method for producing feed-grade wet-process purified phosphoric acid and high-purity high-whiteness semi-hydrated gypsum
  • Method for producing feed-grade wet-process purified phosphoric acid and high-purity high-whiteness semi-hydrated gypsum
  • Method for producing feed-grade wet-process purified phosphoric acid and high-purity high-whiteness semi-hydrated gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1 Phosphate ore pretreatment: The phosphate ore raw ore is crushed and ground into a fineness of more than 85% through a 200-mesh Taylor sieve, and the raw ore is subjected to single reverse flotation to obtain a concentrate pulp with a solid content of 75%; according to the weight of the concentrate pulp, 2.0% Nitric acid and 0.5% sodium sulfate are slowly added to the concentrate slurry, the reaction temperature is 40° C., and the reaction time is 2 hours. After the reaction, the obtained slurry is filtered and separated to obtain the pretreated concentrate slurry.

[0040] Step 2 Phosphoric acid extraction and decomposition of phosphate rock: Phosphoric acid (P 2 o 5 content of 30%-45%) and the pretreated concentrate pulp are added to the extraction reaction tank according to the mass ratio of 10:1, and at the same time, 0.5% of active diatomite (according to the weight of the pretreated concentrate pulp) is added , sodium carbonate 1.0% (according to the weigh...

Embodiment example 2

[0054] Step 1 Phosphate ore pretreatment: The raw phosphate ore is crushed and ground into a fineness of more than 85% through a 200-mesh Taylor sieve, and the raw ore is subjected to single reverse flotation to obtain a concentrate slurry with a solid content of 65%; mix 0.5% sodium nitrate with 4.5% Sulfuric acid is slowly added to the concentrate slurry, the reaction temperature is 20°C, and the reaction time is 6h. After the reaction, the obtained slurry is filtered and separated to obtain the concentrate slurry.

[0055] Step 2 Phosphoric acid extraction and decomposition of phosphate rock: Phosphoric acid (P 2 o 5 content of 30%-45%) and concentrate pulp are added to the extraction reaction tank according to the mass ratio of 20:1, and at the same time, 1.0% of active diatomite, 2.0% of sodium sulfate, and 0.001% of potassium sulfide are added to extract The reaction temperature was 60°C and the reaction time was 6 hours. The extracted slurry obtained from the reaction ...

Embodiment 2

[0058] The main chemical composition table (Wt%) of concentrated ore slurry (dry basis) in step 1 in embodiment 2

[0059]

[0060] The main chemical composition list (Wt%) of crystalline calcium dihydrogen phosphate in step 3 in embodiment 2

[0061]

[0062] The main chemical composition list (Wt%) of wet-process phosphoric acid product in step 4 in embodiment 2

[0063]

[0064] P in wet process phosphoric acid 2 o 5 / F(P 2 o 5 Ratio to the quality of F: 407 (feed grade phosphate national standard P 2 o 5 / F>280).

[0065] The main chemical composition table (wt%) of the high-purity and high-whiteness hemihydrate gypsum product (dry basis) in step 4 of embodiment 2.

[0066]

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

The invention discloses a method for producing feed-grade wet-process purified phosphoric acid together with high-purity high-whiteness semi-hydrated gypsum. The method includes following steps: subjecting raw phosphorite to smashing, grinding and flotation to obtain concentrate pulp, adding a metal ion inhibitor into the concentrate pulp, and filtering and separating after reaction to obtain pretreated phosphorite pulp; enabling phosphoric acid and the pretreated phosphorite pulp to be in extraction decomposition reaction, adding a compound purifying agent for defluorination and dearsenification, filtering and separating mixed pulp after reaction to obtain a filter cake I and filtrate I, adding monocalcium phosphate crystallization improver into the filtrate I for monocalcium phosphate cooling crystallization, filtering and separating to obtain crystallized monocalcium phosphate and filtrate II, enabling crystallized monocalcium phosphate and concentrated phosphoric acid to be in secondary extraction reaction, filtering and separating to obtain filtrate-the wet-process phosphoric acid, using hot water to wash the filter cake, and drying the filter cake to obtain semi-hydrated gypsum. By the method, concentration of the wet-process phosphoric acid is increased, impurity content is lowered, and the feed-grade wet-process phosphoric acid and high-purity high-whiteness semi-hydrated gypsum can be obtained.

Description

technical field [0001] The invention relates to a method for producing feed-grade wet-purified phosphoric acid and co-producing high-purity and high-whiteness hemihydrate gypsum, which belongs to the technical field of chemical production. Background technique [0002] Phosphoric acid is the basic raw material for producing various industrial and agricultural phosphorus products. At present, there are two industrial techniques for producing phosphoric acid: "thermal" process and "wet" process. [0003] Among them, the thermal phosphoric acid process refers to the use of phosphate rock as the main raw material, high-temperature reduction with coke in an electric furnace at 1300°C-1500°C to obtain elemental phosphorus, and then sublimates and escapes in a vapor state, and then burns and hydrates to produce 85% phosphorus. Thermal phosphoric acid. The thermal phosphoric acid product produced by the "thermal method" process has high purity, high concentration and less impuritie...

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): C01B25/222C01F11/46C09K17/04C09K17/02
CPCC01B25/222C01F11/46C01P2006/80C01P2006/90C09K17/02C09K17/04
Inventor 陈伟盛勇吴世琴付全军周佩田萍王雪娟安剑波
Owner SINOCHEM YUNLONG
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