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Process for preparing high concentration phosphoric acid from middle-and low-grade phosphorus ore

A low-grade, high-concentration technology, applied in the direction of phosphoric acid, phosphate, phosphorus oxyacid, etc., can solve the problems of large investment and inoperability, and achieve the goal of reducing total investment, saving pre-treatment costs, and saving concentration costs Effect

Inactive Publication Date: 2007-07-11
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To sum up, the commonality of these three patents is mainly to make a fuss about the saturated solution of calcium dihydrogen phosphate. In the case of a large amount of evaporation in the small laboratory device, the concentration of the phosphoric acid produced does not exceed 24%. , if current domestic and foreign wet-process phosphoric acid plants use medium and low-grade phosphate rock to produce wet-process phosphoric acid, a large number of transformations are required, the investment is large, and it is not operable

Method used

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  • Process for preparing high concentration phosphoric acid from middle-and low-grade phosphorus ore
  • Process for preparing high concentration phosphoric acid from middle-and low-grade phosphorus ore
  • Process for preparing high concentration phosphoric acid from middle-and low-grade phosphorus ore

Examples

Experimental program
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Effect test

example 1

[0040] 1.1 Preparation of base acid

[0041] Weigh phosphate rock powder 12000g (P 2 o 5 % 20.6), according to the traditional method of extracting phosphoric acid, the concentration of phosphoric acid is divided into six times, using 2000g of rock phosphate powder each time, the first extraction adopts tap water to adjust the liquid-solid ratio, filters after the reaction is completed, and washes the filtrate and The first wash is used as the base acid for the second extraction of phosphoric acid, the second wash and the third wash are respectively used as the first wash and the second wash of the acid filter cake for the next extraction, and tap water is used for the third wash. The third to sixth acid extraction tests were completed in the same way. The controlled reaction conditions are: SO 3 It is ~3.5%,; the reaction temperature is: ~°C; the extraction time is 6 hours; the liquid-solid ratio is 2.5:1. After the sixth acid extraction, the amount of phosphoric acid fil...

example 2

[0046] 2.2 Low-grade phosphate rock acid production

[0047] Weigh phosphate rock powder 3000g (P 2 o 5 % 24.2), adding water makes it a water-containing 35% ore slurry, according to the reaction conditions for preparing the bottom acid, the liquid-solid ratio of the bottom acid prepared above and a washing liquid to gradually adjust the reaction slurry is 3.0. The amount of filtrate used is 7970g, and the amount of one washing liquid is 3760g. After the reaction is completed, filter, and use the second washing solution for preparing the bottom acid as the first washing water, and remove 3000g in total. The third washing solution for preparing the bottom acid is all used as the second washing water for this acid extraction, and the third washing water is all clear water. For washing, share 3000g of clear water. Filtrate and lotion produced through analysis, its data are as follows:

example 3

[0050] 3.2 Low-grade phosphate rock production of acid

[0051] Weigh phosphate rock powder 1000g (P 2 o 5 % 22.1), add water to make it a water-containing 35% ore slurry, according to the reaction conditions for preparing the bottom acid, the liquid-solid ratio of the bottom acid prepared above and a washing liquid to gradually adjust the reaction slurry is 2.5. Use 1950g of filtrate, 1150g of the first wash, and 150g of the second wash. After the reaction is completed, filter, use the second washing solution for preparing the bottom acid as the first washing water, and share 950g, and all the three washing solutions for preparing the bottom acid are used as the second washing water for this acid extraction, and the third washing water is all clear water For washing, share 990g of clean water. Filtrate and lotion produced through analysis, its data are as follows:

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Abstract

The invention discloses a making method of high-density phosphic acid based on middle or low grade phosphoric ore, which comprises the following steps: separating extracted phosphic acid system from washing quantity of phosphogypsum; manufacturing sediment phosphate; avoiding the unflavored effect due to increasing present system; using partial phosphor element to manufacture refined sediment phosphoric acid salt; reducing the loss of phosphor; circulating mother liquid of phosphate into grinding system or washing water of phosphogypsum.

Description

1. Technical field [0001] The technical field of application of the invention is the production of phosphates. 2. Background technology [0002] my country is a country rich in phosphate rock resources. The production and consumption of phosphate rock rank among the top in the world. The reserves of phosphate rock are 15.158 billion tons. my country's phosphate rocks are mainly of medium and low grades. With the rising consumption of phosphate fertilizers at home and abroad, the high-grade phosphate rocks that phosphate fertilizer manufacturers rely on are also being depleted at an accelerated rate. At present, all phosphate fertilizer manufacturers at home and abroad cannot use medium and low-grade phosphate rock to produce 25% (P 2 o 5 ) above high concentrations of phosphoric acid. [0003] In the international arena, in order to obtain better economic benefits for the enterprise and ensure the normal and stable operation of the plant, the wet-process phosphoric acid p...

Claims

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Application Information

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IPC IPC(8): C01B25/18C01B25/26C01B25/01
Inventor 张志业陈晓东费德君王励生
Owner SICHUAN UNIV
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