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A method for simultaneously preparing sulfuric acid and potassium sulfate by utilizing potassium feldspar, phosphogypsum, and silica

A technology of potassium feldspar and phosphogypsum, applied in the field of chemical metallurgy, can solve the problems of low sulfur recovery rate, achieve high decomposition rate, increase ash melting point, and high recovery rate

Inactive Publication Date: 2019-12-31
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Our previously disclosed invention patent CN103466661A uses phosphogypsum as an auxiliary agent to activate potassium feldspar to extract potassium. The roasting temperature is 900~1300°C, and the extraction rate of potassium is over 90%, but the recovery rate of sulfur in the whole process is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Mix potassium feldspar finely ground to below 150 μm with phosphogypsum and silica at a mass ratio of 1:4:2;

[0018] (2) The mixture is mixed with sodium humate as a binder for pelletizing;

[0019] (3) Roast the pellets at 1200 °C for 120 min to obtain solid reduction products and 2 exhaust;

[0020] (4) leaching the solid reduction product obtained in step (3) with water to obtain a potassium-rich solution, the leaching temperature is 90°C, the leaching time is 60min, and the liquid-solid mass ratio is 2:1; by analyzing the potassium content in the potassium-rich solution, Calculation and the ratio of the potassium element in the obtained potassium feldspar, the extraction rate of available potassium is 86%; the decomposition rate of phosphogypsum is 98%;

[0021] (5) with the SO containing SO obtained in step (3) 2 After the tail gas is dedusted and purified, it is sent to the sulfuric acid system to prepare the finished sulfuric acid product.

Embodiment 2

[0023] (1) Evenly mix potassium feldspar finely ground to below 150 μm with phosphogypsum and silica at a mass ratio of 1:2:1;

[0024] (2) The mixture is mixed with sodium humate as a binder for pelletizing;

[0025] (3) Roast the pellets at 1150°C for 240 min to obtain solid reduction products and 2 exhaust;

[0026] (4) leaching the solid reduction product obtained in step (3) with water to obtain a potassium-rich solution, the leaching temperature is 40°C, the leaching time is 120min, and the liquid-solid mass ratio is 3:1; by analyzing the potassium content in the potassium-rich solution, Calculation and the ratio of the potassium element in the obtained potassium feldspar, the extraction rate of available potassium is 75%; the decomposition rate of phosphogypsum is 87%;

[0027] (5) with the SO containing SO obtained in step (3) 2 After the tail gas is dedusted and purified, it is sent to the sulfuric acid system to prepare the finished sulfuric acid product.

Embodiment 3

[0029] (1) Mix potassium feldspar finely ground to below 150 μm with phosphogypsum and silica at a mass ratio of 1:4:1;

[0030] (2) The mixture is mixed with sodium humate as a binder for pelletizing;

[0031] (3) Roast the pellets at 1300 °C for 30 min to obtain solid reduction products and SO-containing 2 exhaust;

[0032] (4) leaching the solid reduction product obtained in step (3) with water to obtain a potassium-rich solution, the leaching temperature is 60°C, the leaching time is 30min, and the liquid-solid mass ratio is 4:1; by analyzing the potassium content in the potassium-rich solution, Calculation and the ratio of the potassium element in the potassium feldspar obtained, the extraction rate of available potassium is 81%; the decomposition rate of phosphogypsum is 93%;

[0033] (5) with the SO containing SO obtained in step (3) 2 After the tail gas is dedusted and purified, it is sent to the sulfuric acid system to prepare the finished sulfuric acid product.

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PUM

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Abstract

The invention discloses a method for preparing sulfuric acid and potassium sulfate simultaneously by utilizing potassium feldspar, ardealite and silica. The process of the method comprises the following steps of: uniformly mixing the potassium feldspar, the ardealite and the silica according to certain proportion after grinding to below 150mum; (2) mixing a binding agent into the mixture to carry out balling; (3) calcining balls for a period of time at a certain temperature to obtain solid reduction products and SO2-containing tail gas; (4) using water to leach the solid reduction products for a period of time by certain liquid-solid ratio at a certain temperature to obtain potassium-rich solution; and (5) carrying out dust-removing purification on the SO2-containing tail gas obtained in the step (3), and conveying into a sulfuric-acid system to prepare a finished sulfuric-acid product. The method disclosed by the invention has the advantages that two process steps of reducing the ardealite to prepare acid and extracting potassium from the potassium feldspar are coupled, the treatment for ardealite solid wastes is realized, simultaneously soluble potassium sulfate and the sulfuric acid are recovered, the ardealite decomposition rate is high, the sulfur recovering rate is high, and the potassium extracting rate is higher, so that the advantage on economy is significant.

Description

technical field [0001] The invention belongs to the technical field of chemical metallurgy, and mainly relates to a method for simultaneously preparing sulfuric acid and potassium sulfate by utilizing phosphogypsum, potassium feldspar and silica. Background technique [0002] Phosphogypsum is the industrial waste produced by the reaction of ore and sulfuric acid in the production process of wet-process phosphoric acid. According to statistics, at present, every ton of phosphoric acid produced will produce 5 tons of phosphogypsum. China is the largest producer of phosphate fertilizer in the world, adding about 70 million tons of phosphogypsum every year, and the environmental pollution caused by a large amount of stockpiled phosphogypsum is becoming increasingly serious. At present, the reduction of phosphogypsum to sulfuric acid is considered to be the most effective way to utilize phosphogypsum and realize large-scale production. Coke or pulverized coal are often used as r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/74C01B17/50C01D5/10
CPCC01B17/506C01B17/74C01D5/10
Inventor 吕莉刘维燥李春梁斌胡晓伟袁绍军
Owner SICHUAN UNIV