Method for producing phosphoric acid and soluble potassium salt by phosphorus ore and potash feldspar

A technology of potassium feldspar and phosphate rock, which is applied in the field of phosphoric acid and soluble potassium salt production, can solve the problems of complex process flow, high production cost, and high energy consumption, and reduce external heat supply, reduce heat energy consumption, and promote The effect of decomposition

Inactive Publication Date: 2009-11-25
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problems are: high energy consumption, high production cost, complex process
[0005] After literature search, there is no public report that combines the phosphoric acid production process and the soluble potassium fertilizer production process, and can simultaneously produce phosphoric acid and soluble potassium salt

Method used

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  • Method for producing phosphoric acid and soluble potassium salt by phosphorus ore and potash feldspar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Phosphate rock (containing P 2 o 5 30%, CaO45%), potassium feldspar (containing K 2 O14%, SiO 2 60%) and coke are crushed respectively, the ratio of phosphate ore to coke is equal to 1:0.55 (by weight ratio on a dry basis), and the calcium-silicon ratio between phosphate ore and potassium feldspar is 2.3 (by a molar ratio on a dry basis). For the total amount, weigh 5.26kg, 2.90kg and 1.84kg of phosphate rock, coke and potassium feldspar respectively. Grind in a Ф500×600 ball mill for 1 hour to meet the requirement of 5% of the 180-mesh sieve. Add water to the powder to form a ball and dry it. Take 5kg of the dry sample and put it into a kiln with a diameter of Ф200×1000, and calcinate it for 20 minutes at a temperature of 1200°C. 2 o 5After the kiln gas is dedusted and purified by the dust removal and purification equipment, it enters the hydration tower for hydration and absorption to obtain phosphoric acid, and the conversion rate of phosphorus is 75%. 20:1 soa...

Embodiment 2

[0031] Phosphate rock (containing P 2 o 5 20%, CaO30%), potassium feldspar (containing K 2 O18%, SiO 2 62%) and coke are broken separately, the ratio of phosphate ore to coke is equal to 1:0.35 (by dry basis weight ratio), and the calcium-silicon ratio of phosphate ore and potassium feldspar is 1.8 (by dry basis molar ratio), with In total of 10kg, weigh 6.10kg, 2.14kg and 1.76kg of phosphate rock, coke and potassium feldspar respectively. Grind in a Ф500×600 ball mill for 1 hour to meet the requirement of 5% of the 180-mesh sieve. Add water to the powder to form a ball and dry it. Take 5kg of the dry sample and put it into a kiln with a diameter of Ф200×1000, and calcinate it for 30 minutes at a temperature of 1100°C. 2 o 5 After the kiln gas is dedusted and purified by the dust removal and purification equipment, it enters the hydration tower for hydration and absorption to obtain phosphoric acid, and the conversion rate of phosphorus is 74.52%. Soak in 15:1 for 12 hou...

Embodiment 3

[0033] Phosphate rock (containing P 2 o 5 15%, CaO22.5%), potassium feldspar (containing K 2 O10%, SiO 2 68%) and coke are respectively crushed, the ratio of phosphate rock to coke is equal to 1:0.45 (by weight ratio on a dry basis), and the calcium-silicon ratio of phosphate rock and potassium feldspar is 2.0 (by molar ratio on a dry basis). In the total amount of 10kg, 6.15kg, 2.76kg and 1.09kg of phosphate rock, coke and potassium feldspar were weighed respectively. Grind in a Ф500×600 ball mill for 1 hour to meet the requirement of 5% of the 180-mesh sieve. Add water to the powder to form a ball and dry it. Take 5kg of the dry sample and put it into a kiln with a diameter of Ф200×1000, and calcinate it for 10 minutes at a temperature of 1400°C. 2 o 5 After the kiln gas is dedusted and purified by the dust removal and purification equipment, it enters the hydration tower for hydration and absorption to obtain phosphoric acid, and the conversion rate of phosphorus is 87...

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Abstract

The invention is a method for producing phosphoric acid and soluble potassium salt by phosphorus ore and potash feldspar, characterized in that, the method comprises: selecting phosphorus ore containing P2O5 15-30% and potash feldspar containing K2O 10-18% to mix with coke; crushing, ball milling, balling by adding water and drying; calcining for 10-30 minutes under temperature of 1100-1400DEG C; then soaking the calcined product in 1-5% citric acid solution for 12 hours, wherein, the soaking temperature is between room temperature and 60 DEG C; crystallizing and purifying the separated filtering solution; obtaining the soluble potassium salt; P2O5 in the phosphorus ore is reduced into phosphor vapor to be volatilized, the phosphor vapor above the material layer can be oxidized into P2O5 gas by the air introduced into the furnace, in the hydration apparatus, P2O5 gas can be absorbed to obtain the phosphoric acid. the invention solves the problems of waste slag and waste gas emissions during producing phosphoric acid, also alleviates the existing state that in our country, the soluble kalium resources are depended on importation, the method of the invention is economical and environment-protecting.

Description

technical field [0001] The invention relates to the technical field of phosphoric acid and soluble potassium salt production, in particular to a method for producing phosphoric acid and soluble potassium salt by using phosphate rock and potassium feldspar. Background technique [0002] Phosphoric acid is the parent product of the phosphorus chemical industry and the phosphate fertilizer industry, and is one of the three most important basic acids commonly used in the chemical industry. At present, the main process methods for producing phosphoric acid from phosphate rocks are: 1. Wet process phosphoric acid, the strong acid-weak salt reaction represented by sulfuric acid, replaces phosphoric acid, and obtains phosphoric acid after separating phosphogypsum; 2. Thermal process phosphoric acid, using electric furnace French yellow phosphorus is used as raw material, and thermal phosphoric acid is obtained through combustion oxidation and hydration. The characteristics of wet p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/18C04B7/14
CPCY02P40/10
Inventor 夏举佩张召述丁楠
Owner KUNMING UNIV OF SCI & TECH
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