Method for extracting phosphorite co-production gypsum whisker by utilizing nitric acid

A technology of gypsum whiskers and nitric acid, applied in the chemical industry, can solve problems such as increasing production cost, and achieve the effects of low production cost, improved raw material utilization rate, and low energy consumption

Active Publication Date: 2012-02-15
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method uses extractant to prepare phosphoric acid and recycle hydrochloric acid or nitric acid, which increases production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method utilizing nitric acid to extract phosphate rock to co-produce gypsum whiskers, comprising the following steps:

[0016] (1) Take 277.3g of nitric acid solution with a concentration of 50% by mass and 127g of phosphate rock powder, react at 50°C for 60 minutes, and stir at a speed of 350 rpm. The resulting mixture is filtered and the filtrate is frozen and crystallized at -5°C In 300 minutes, 131g of calcium nitrate tetrahydrate was obtained, and the phosphoric acid concentration of the product was 18.9%;

[0017] (2) In 265g of calcium nitrate tetrahydrate solution with a mass concentration of 18.8%, add 90g of a mass percent concentration of 30% sulfuric acid solution, control the reaction temperature to 90°C, the stirring speed to 220 rpm, and the reaction time to 30 minutes, the obtained After the mixed solution is filtered, the filter residue is dried at 60° C. for 2 hours to obtain the product calcium sulfate whiskers. The filtrate is nitric acid, and the...

Embodiment 2

[0020] A method utilizing nitric acid to extract phosphate rock to co-produce gypsum whiskers, comprising the following steps:

[0021] (1) Take 277.3g of nitric acid solution with a mass percentage concentration of 60% and 127g of phosphate rock powder, react at 50°C for 70 minutes, and stir at a speed of 350 rpm. The resulting mixture is filtered and the filtrate is frozen and crystallized at -5°C 300 minutes, got product calcium nitrate tetrahydrate 135g, product phosphoric acid concentration 19.3%;

[0022] (2) Add 230 g of sulfuric acid solution with a mass percentage concentration of 10% and 1.0 g of magnesium sulfate to 210 g of calcium nitrate tetrahydrate with a mass concentration of 28.6%, control the reaction temperature at 50°C, and the stirring speed at 150 rpm. After 30 minutes, the resulting mixture was filtered, and the filter residue was dried at 60° C. for 2 hours to obtain the product calcium sulfate whiskers. The filtrate is nitric acid, and the nitric aci...

Embodiment 3

[0025] A method utilizing nitric acid to extract phosphate rock to co-produce gypsum whiskers, comprising the following steps:

[0026] (1) Take 230g of nitric acid solution with a concentration of 50% by mass and 127g of phosphate rock powder, react at 55°C for 50 minutes, and the stirring speed is 350 rpm, and the resulting mixture is filtered and the filtrate is frozen and crystallized at -5°C for 290 Minutes, get product calcium nitrate tetrahydrate 124g, product phosphoric acid concentration 18.7%;

[0027] (2) In 291 mass concentration of 31.3% calcium nitrate tetrahydrate and 85 g of 40% mass percentage concentration of sulfuric acid solution and 2.0 g of magnesium sulfate, the reaction temperature is controlled at 90 ° C, the stirring speed is 250 rpm, and the reaction time is 60 minutes, the resulting mixture was filtered, and the filter residue was dried at 60°C for 2 hours to obtain the product calcium sulfate whiskers. The filtrate is nitric acid, and the nitric a...

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Abstract

The invention discloses a method for extracting a phosphorite co-production gypsum whisker by utilizing nitric acid, which comprises leaching phosphorite powder by taking a nitric acid solution of which the mass percent concentration is 50-60 percent as a raw material, wherein the mass ratio of the nitric acid to the phosphorite powder is 0.9-1.31; reacting for 50-70 minutes at the temperature of50-55 DEG C at the stirring speed of 350 turns per minute to obtain mixed liquor, filtering the mixed liquor, and then, performing freeze crystallization on the mixed liquor at the temperature of minus 5-0 DEG C for 280-300 minutes to obtain a product: tetrahydrated calcium nitrate; and adding a sulfuric acid solution and magnesium sulfate to a tetrahydrated calcium nitrate solution under the conditions of controlling the reaction temperature to be 40-90 DEG C, the stirring speed to be 150-250 turns per minute and the reaction time to be 30-60 minutes to obtain mixed liquor, filtering the mixed liquor, and then, drying filter residues at the temperature of 60 DEG C for 2 hours to obtain the product: a calcium sulfate whisker. The method for extracting the phosphorite co-production gypsum whisker by utilizing the nitric acid can improve the use ratio of the raw material, has low energy consumption and low production cost and is green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for extracting phosphate rock and coproducing gypsum whiskers with nitric acid. [0002] Background technique [0003] There are two main industrial production processes of phosphoric acid: thermal phosphoric acid and wet phosphoric acid. The product obtained by the thermal process is thermal phosphoric acid, which is of high quality and is usually used to manufacture phosphate products or food-grade phosphate, while the product produced by wet process phosphoric acid is of poor quality. Depending on the phosphate rock used, the acid Containing more impurities, it is usually used to produce fertilizers, or to produce feed-grade and food-grade phosphate products after purification. The cost of wet-process phosphoric acid is 20-30% lower than that of thermal phosphoric acid. After proper purification, the purity of the product can be comparable to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/62C30B29/46C01B25/22
Inventor 胡厚美郭举胡宏刘旭孙志岩王书林
Owner WENGFU (GRP) CO LTD
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