Purification treatment method of wet-process phosphoric acid

A technology for wet-process phosphoric acid and purification treatment, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high cost of thermal phosphoric acid, serious environmental pollution, large phosphorus loss, etc. The effect of high efficiency and easy operation and control

Inactive Publication Date: 2009-12-16
云南新龙矿物质饲料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of hot-process phosphoric acid is much higher than that of wet-process phosphoric acid. The higher the ratio of hot-process phosphoric acid, the higher the cost
At the same time, the waste residue produced by the general wet phosphoric acid purification process contains a large amount of useless impurities, and is generally discarded directly, resulting in large phosphorus loss and serious environmental pollution.

Method used

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  • Purification treatment method of wet-process phosphoric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A, according to the fluorine ion selective electrode method and the mass percent content of fluorine in phosphoric acid measured by the barium sulfate gravimetric method is 1.3% (F); the mass percent content of sulfur trioxide is: 3.2% (SO 3 ).

[0030] B, add 75 tons of wet process phosphoric acid in reaction tank 1. Add 615 kg of active silicon dioxide that meets the HG / T 3061-1999 standard, 1080 kg of sodium carbonate with a total alkali content ≥ 98.8%, and 3500 kg of P 2 o 5 ≥32% phosphate rock is ground into powder phosphate rock powder with a fineness of 200 or 230 or 250 or 270 or 300 or 325 mesh.

[0031] C. Feed saturated steam into reaction tank 1, heat the material to 65 or 67 or 69 or 70°C, and stir at constant temperature for 110 or 115 or 125 or 130 minutes to obtain a well-reacted material.

[0032] D. Send the reacted material into the tank 2 of the plate and frame filter press with the pump 4, and the filtrate after the press filtration is qualified...

Embodiment 2

[0035] A, according to the fluorine ion selective electrode method and the mass percent content of fluorine in phosphoric acid measured by the barium sulfate gravimetric method is 1.3% (F); the mass percent content of sulfur trioxide is: 3.2% (SO 3 ).

[0036] B, add 75 tons of wet process phosphoric acid in reaction tank 1. Add 615 kg of active silicon dioxide that meets the HG / T 3061-1999 standard, 1080 kg of sodium carbonate with a total alkali content ≥ 98.8%, and 3500 kg of P 2 o 5 ≥32% Phosphate rock powder ground into 200 or 235 or 245 or 260 or 313 or 323 mesh powder phosphate rock powder.

[0037] C. Feed saturated steam into reaction tank 1, heat the material to 66 or 68°C, and stir at constant temperature for 113 or 117 or 120 or 128 minutes to obtain a well-reacted material.

[0038] D. Send the reacted material into the tank 2 of the plate and frame filter press with the pump 4, and the filtrate after the press filtration is qualified purified wet-process phosp...

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Abstract

The invention discloses a purification treatment method of wet-process phosphoric acid, which comprises the following steps: firstly analyzing contents of fluorine and sulfur trioxide in the wet-process phosphoric acid; secondly adding the wet-process phosphoric acid to a reactive tank; according to the analytical data, calculating and taking white carbon black and sodium carbonate in the quantity of defluorination; calculating and taking powdered rock phosphate in the quantity of desulfurization; respectively throwing the white carbon black, the sodium carbonate and the powdered rock phosphate in a solid phase into the purification reactive tank and stirring; thirdly leading saturated vapour into the purification reactive tank; controlling the reaction temperature and the time of materials; obtaining reactive materials; fourthly using a pump to send the reactive materials into a groove of a plate and frame filter press; directly using filter liquor which is purified wet-process phosphoric acid after filter pressing to produce feed-grade calcium biphosphate; fifthly placing filter cakes after filter pressing into a surge tank; adding clear water to prepare the filter cakes into slurry; using the pump to send the slurry into an extraction tank; and recovering residual phosphorus. The invention has the advantages of high impurity removal efficiency, small phosphorus loss, easy obtainment of impurity removing agents, low cost and easy operation control; moreover, purified wet-process phosphoric acid can be directly used for producing feed-grade calcium biphosphate.

Description

technical field [0001] The invention relates to the technical field of wet-process phosphoric acid purification production, in particular to a method for wet-process phosphoric acid purification treatment for producing feed-grade calcium dihydrogen phosphate. Background technique [0002] In the production of wet-process phosphoric acid, especially the wet-process phosphoric acid produced from low- and medium-grade phosphate rock, after it is concentrated, a large amount of solids will be produced, and as the temperature of the concentrated acid decreases, secondary precipitation will occur. matter, plus the carbonization of organic matter during the leaching of phosphate rock and the abrasion of phosphoric acid material on the graphite evaporator during concentration, so that 50% P 2 o 5 The solid matter content of wet-process phosphoric acid can reach more than 8%, and the acid liquid is black. These solids are collectively referred to as sludge. At the same time, phosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/234
Inventor 罗蜀峰李开英刘利
Owner 云南新龙矿物质饲料有限公司
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