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Method for producing phosphoric acid and low-silicon gypsum by middle-low-grade phosphorus ore

A low-grade, gypsum technology, applied in the direction of chemical instruments and methods, phosphorus compounds, calcium/strontium/barium sulfate, etc., can solve the problems of difficult production of gypsum semi-aqueous method, high water content of gypsum, low concentration of phosphoric acid, etc., to achieve Reuse of water resources, beneficial to recycling, and the effect of improving the quality of phosphate rock

Active Publication Date: 2019-04-05
SHANDONG LUBEI ENTERPRISE GROUP
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current wet-process phosphoric acid production process, the amount of flushing water is large, resulting in a low concentration of phosphorus pentoxide in phosphoric acid, and the resulting gypsum has a high water content. It is difficult to achieve gypsum semi-aqueous production

Method used

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  • Method for producing phosphoric acid and low-silicon gypsum by middle-low-grade phosphorus ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]1000kg solid content is 70% ore slurry (CO2 content is 5.71%, P2O5 content is 29.21%, MgO content is 2.51%), add a certain proportion of magnesium removal waste liquid (circulation), adjust the initial liquid-solid ratio to be 2: 1. Place in the pretreatment reaction tank and stir continuously at a stirring speed of 100rpm. 1334kg of magnesium removal waste liquid and 445kg of waste acid (the concentration of sulfuric acid is 20%, and the temperature is 45°C) are passed into the dilute acid storage tank for rapid mixing, and then input through the pipeline React with phosphate rock in the pretreatment reaction tank, control the adding speed of sulfuric acid to ensure that the pH value of the reaction liquid phase is between 2.7-3, control the feeding time at 1h, extend the reaction for 0.5h after the feeding is completed, and separate the liquid and solid phases. The CO2 content in the filter cake base was analyzed to be 2.62%, the P2O5 content was 29.02%, and the MgO con...

Embodiment 2

[0022] 1000kg solid content is 70% ore slurry (CO2 content is 4.47%, P2O5 content is 29.19%, MgO content is 2.19%), add a certain proportion of magnesium removal waste liquid (circulation), adjust the initial liquid-solid ratio to be 2: 1. Place in the pretreatment reaction tank and stir continuously at a stirring speed of 100rpm. Put 1045kg of magnesium-removing waste liquid and 348kg of waste acid (the concentration of sulfuric acid is 20%, and the temperature is 45°C) into the dilute acid storage tank for rapid mixing, and pass through the pipeline Input it into the pretreatment reaction tank to react with phosphate rock, control the adding speed of sulfuric acid to ensure that the pH value of the reaction liquid phase is between 2.7-3, control the feeding time at about 1h, extend the reaction for 0.5h after the feeding is completed, and separate the liquid and solid According to phase analysis, the CO2 content in the filter cake base is 2.56%, the P2O5 content is 28.98%, an...

Embodiment 3

[0024] Put 8kg of wet-process phosphate gypsum (with a silicon content of 7.19% and a phosphorus content of 0.61%) into a 65-mesh standard sieve and sieve it under tap water. until the water that comes out from under the sieve is clear. Put the sieve residue, gypsum under the sieve, and the standard sieve together in an oven at 80°C to dry to constant weight, cool to room temperature, weigh and analyze the silicon and phosphorus content in the sieve residue, under the sieve and the original gypsum, and calculate the silicon yield under the sieve. Rate. After the phosphogypsum is sieved, the silicon content in the gypsum under the sieve is 6.27%, and the phosphorus content is 0.50%. The silicon yield of the gypsum under the sieve is 85.04%, and the phosphorus yield is 79.92%, and the sieving obviously reduces the content of silicon and phosphorus in the gypsum.

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Abstract

The invention relates to a method for producing phosphoric acid and low-silicon gypsum by a middle-low-grade phosphorus ore. According to the method, ferrous-iron-containing waste acid is diluted by magnesium removal waste liquid, the diluted ferrous-iron-containing waste acid and the phosphorus ore react, easily decomposed components such as carbonate in the phosphorus ore are decomposed, so thatacid consumption of subsequent phosphate leaching reaction is reduced, the quality of the phosphorus ore is improved, production cost is reduced, the gypsum is screened to remove part of silicon, phosphorus content is reduced, so that the gypsum serves as a good cement raw material, application approaches are provided for wide comprehensive utilization of phosphogypsum, filter flushing water of wet phosphoric acid slurry is recycled after being filtered to remove slag, water consumption is reduced, and phosphoric acid concentration is improved.

Description

technical field [0001] The invention relates to chemical demagnesization of phosphate ore in phosphorus chemical industry, physical removal of impurities from gypsum, production of high-concentration phosphoric acid and gypsum with low impurity content, and recycling of waste by-products, specifically a medium and low-grade phosphate rock to produce phosphoric acid and low Silica plaster method. Background technique [0002] In the phosphate fertilizer and phosphate industries, phosphate rock is usually hydrolyzed with sulfuric acid to produce wet-process phosphoric acid, and then the wet-process phosphoric acid is processed into various products. There are few high-grade phosphate rocks in China, and most of them are low-grade phosphate rocks. Low-grade phosphate rocks contain high levels of harmful impurities such as iron, aluminum, and magnesium, which not only increase the unit consumption of sulfuric acid during acidolysis, but are also not conducive to the production o...

Claims

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Application Information

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IPC IPC(8): C01B25/222C01F11/46C01F5/14
CPCC01B25/222C01F5/14C01F11/46
Inventor 吕天宝王同永高强鮑树涛蔡元庚杜建豹韩晓宁王蒙
Owner SHANDONG LUBEI ENTERPRISE GROUP
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