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Preparation method for preparing potash fertilizer and producing sulfuric acid simultaneously employing mineral with potassium, ardealite and high-sulphur coal

A technology of phosphogypsum and high-sulfur coal, which is applied in the field of preparation of potash fertilizer and co-production of sulfuric acid, can solve environmental pollution and other problems, and achieve the effects of low equipment investment, low comprehensive production cost and wide distribution

Inactive Publication Date: 2009-12-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Realized the recycling of sulfur in high-concentration phosphate fertilizer production enterprises, solved the problem of environmental pollution caused by phosphogypsum stockpiling, and also found a reasonable way to use high-sulfur coal sources

Method used

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  • Preparation method for preparing potash fertilizer and producing sulfuric acid simultaneously employing mineral with potassium, ardealite and high-sulphur coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]1) Formula composition (substance measurement units are parts by mass):

[0029] (1) Potassium feldspar: 65 parts, phosphogypsum: 31 parts, high-sulfur coal: 4 parts;

[0030] (2) The auxiliary agent is sodium fluoride, and the consumption is 1% of potassium feldspar;

[0031] 2) Process method:

[0032] After blending the above formula, grind it in a ball mill to form a powder with a particle size of less than 0.08mm accounting for 95%, add water to form a ball, bake it in a drying oven at 105°C for 4 hours, and put it into a tube with a set temperature of 950°C In the furnace, the inlet valve connected to the porcelain tube is closed, and the outlet is inserted into the water seal tank. The temperature rise rate of the tube furnace is 20°C / min. When the temperature rises to 1200°C, it is maintained for 10 minutes, then oxygen is introduced, and the inlet and outlet valves are opened at the same time. The oxygenation time is 20 minutes in total, the oxygen flow rate ...

Embodiment 2

[0036] 1) Formula composition (substance measurement units are parts by mass):

[0037] (1) Potassium feldspar: 32 parts, phosphogypsum: 61 parts, high-sulfur coal: 7 parts;

[0038] (2) The auxiliary agent is sodium hydroxide, and the consumption is 1.5% of potassium feldspar;

[0039] 2) Process method:

[0040] Blend the materials of the above formula (1) and grind them in a ball mill to form a powder with a particle size of less than 0.08mm accounting for 96.3%, add an aqueous solution dissolved in sodium hydroxide and pressurize it into a cake shape, and dry it in a desiccator at 105°C After 4 hours, take it out and crush it, take the mixture with a particle size of 5-10 mm and put it into a tube furnace with a set temperature of 1200 ° C, close the inlet valve connected to the porcelain tube, and insert the outlet into a water-sealed tank. The heating rate of the tube furnace is 20°C / min. When the temperature rises to 1200°C and maintains for 10 minutes, oxygen is intr...

Embodiment 3

[0044] 1) Formula composition (substance measurement units are parts by mass)

[0045] (1) Potassium feldspar: 65 parts, phosphogypsum: 31 parts, high-sulfur coal: 4 parts;

[0046] (2) The auxiliary agent is calcium fluoride, and the consumption is 0.5% of potassium feldspar;

[0047] 2) Process method:

[0048] Grinding powder with a particle size of less than 0.08mm accounts for 95.60%. In the tube furnace with a set temperature of 1100°C, the temperature rise rate of the continuous tube furnace is 20°C / min. When the temperature rises to 1100°C, it is maintained for 10 minutes. Oxygen was introduced afterward, and the time of oxygen ventilation was 30 minutes in total. The first 10 minutes of oxygen ventilation was 3 liters / minute, and the last 20 minutes was 10 liters / minute. The rest of the operations are the same as above. The results are as follows: Sulfur is converted to SO 2 The conversion rate of 87.40%, the yield of soluble potassium is 97.06%, and the total con...

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Abstract

The invention relates to a preparation method for preparing potash fertilizer and producing sulfuric acid simultaneously employing mineral with potassium, ardealite and high-sulphur coal, comprising the following steps: mixing the mineral with potassium, ardealite and high-sulphur coal in a mass percent of 32-65:31-61:4-7 with assistant, then adding the mixture in a ball mill for grinding, adding water to form balls, drying the balls, performing roasting reaction at 950-1250 DEG C in a tube furnace with a controllable reaction atmosphere which uses reducing atmosphere firstly and later weakly oxidizing atmosphere in the reaction process, finally separating the products into gaseous phase and solid phase and preparing soluble potassium sulfate fertilizer and the feed gas for making acid, namely SO2 simultaneously; wherein, the content of assistant is 1-3wt% of KAlSi3O8 contained in the mineral with potassium. The invention makes full use of the characteristic that China has rich resource of insoluble patassium-bearing rocks, combines the actual situation that usage of ardealite in high analysis phosphate fertilizer industry is large and the utilization rate is low, realizes the recycling of sulfur resources for the phosphate fertilizer industry and expands the product structure of the phosphate fertilizer industry.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing potassium fertilizer and co-producing sulfuric acid by using potassium-containing minerals, phosphogypsum and high-sulfur coal. Background technique [0002] Phosphogypsum is a solid waste produced during the production of high-concentration phosphate fertilizers. According to incomplete statistics, the domestic stockpile of phosphogypsum slag has reached more than 100 million tons, and 30 million tons of phosphogypsum slag will be newly produced every year. About 10%, the rest is still mainly treated by stacking. With the increase of the production of high-concentration phosphate compound fertilizer and the decrease of the grade of raw material phosphate rock, the production of phosphogypsum slag will increase. It is estimated that by 2010, the national production of phosphogypsum slag will reach 50 million tons. The resulting environmental poll...

Claims

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Application Information

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IPC IPC(8): C05D1/02C01B17/50C01B17/74B09B3/00
Inventor 夏举佩张召述王雪
Owner KUNMING UNIV OF SCI & TECH
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