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Method for producing nutritional-type acidic soil conditioner from low-grade phosphate ores

An acid soil, low-grade technology, applied in the agricultural field, can solve the problem of low utilization rate of low-grade phosphate rock, and achieve the effects of inhibiting acidity, lowering melting point and saving electric energy

Active Publication Date: 2014-08-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for producing nutritional acidic soil conditioner by utilizing low-grade phosphate rock. By using white mud and other raw materials to activate low-grade phosphate rock, the problem of low utilization rate of low-grade phosphate rock is solved, and the The problems of land occupation and environmental pollution caused by a large amount of white mud stacking can make full use of various elements in the raw materials to make a nutritional acidic soil conditioner containing phosphorus, calcium, silicon, magnesium and sulfur, thereby providing calcium Provide basis for agricultural resource utilization of basic industrial solid waste

Method used

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  • Method for producing nutritional-type acidic soil conditioner from low-grade phosphate ores

Examples

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Effect test

Embodiment 1

[0030] An enterprise in Sichuan uses low-grade phosphate rock to prepare phosphate fertilizer

[0031] An enterprise in Xichuan adopts this technology to produce phosphate fertilizer, and its low-grade phosphate rock contains P 2 o 5 About 15%. Crush phosphate rock and industrial white mud and pass through a 200-mesh standard sieve. Put the material in an oven at 105±5°C for 5 hours to a constant weight, and then put it in a drying oven to cool down to room temperature to prepare for fertilizer production. . Then according to the mass ratio of industrial white mud and phosphate rock is 1.7:1.0, add 5% sodium chloride of the total mass when industrial white mud and phosphate rock are dried to constant weight as cosolvent, mix uniformly, at roasting temperature The temperature is 1030° C., and the calcination time is 1 hour, and the product is obtained. Through analysis and testing, it can be known that the content of effective phosphorus pentoxide in the product reaches 9.0...

Embodiment 2

[0033] An enterprise in Yunnan uses low-grade phosphate rock to prepare soil compound fertilizer

[0034] An enterprise in Yunnan adopts this technology to produce phosphate fertilizer, and its low-grade phosphate rock contains P 2 o 5 About 15%. Crush phosphate rock and industrial white mud and pass through a 200-mesh standard sieve, then place the material in an oven at a temperature of 105±5°C for 6 hours to a constant weight, and then place it in a drying oven to cool to room temperature for fertilizer production. Prepare. Then according to the mass ratio of white mud and phosphate rock is 1.2:1.0, add the calcium fluoride of 4% of total mass when industrial white mud and phosphate rock are dried to constant weight as cosolvent, mix uniformly, at roasting temperature 1000°C and 1 hour 20 minutes of calcination to obtain the product. Through analysis and testing, it can be known that the content of effective phosphorus pentoxide in the product reaches about 8.3%, and th...

Embodiment 3

[0036] A company in Guangdong prepares soil compound fertilizer

[0037] An enterprise in Guangdong adopts this technology to produce compound fertilizers, and its low-grade phosphate rock contains P 2 o 5About 18%. Crush phosphate rock and industrial white mud and pass through a 200-mesh standard sieve. Put the material in an oven at 105±5°C for 6 hours to constant weight, and then cool it to room temperature in a drying oven to prepare for fertilizer production. . Then according to the mass ratio of white mud and phosphate rock is 0.75:1.0, add 3% sodium sulfate of the total mass when industrial white mud and phosphate rock are dried to constant weight as a cosolvent, mix well, and bake at a temperature of 1020 ℃, the roasting time is 1 hour under the condition of roasting to obtain the product. Through analysis and testing, it can be known that the content of effective phosphorus pentoxide in the product reaches about 8.8%, and the conversion rate of phosphorus element ...

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Abstract

The invention discloses a method for producing a nutritional-type acidic soil conditioner from low-grade phosphate ores. The method comprises the steps of respectively carrying out ball milling on low-grade phosphate ores and industrial white clay generated in the ammonia soda production process and sieving with a 200 meshes sieve, drying at 100-120 DEG C to constant weight, and then mixing at a mass ratio, and adding a fluxing agent, calcining at 1000-1200 DEG C for 0.5-2 hours to obtain the calcined product, cooling the calcined product, crushing and grinding to obtain the acidic soil conditioner containing phosphorus, calcium, silicon, magnesium, sulfur and other nutrients. In the nutritional acidic soil conditioner, the content of effective phosphorus pentoxide is greater than 8%, the content of the effective silicon is greater than 10%, the content of effective magnesium is greater than 2% and the content of effective calcium is greater than 45%, the content of the active ingredients in the product is not less than 65% and the pH value of the acidic soil conditioner is 8-12. The method disclosed by the invention has the advantages of wide sources of raw materials, cheap and easily available raw materials, electric energy is saved in the preparation process, the full use of the resources is made and the utilization rate of low-grade phosphate ores is improved.

Description

technical field [0001] The invention relates to the field of agriculture, in particular to a method for producing a nutritional acidic soil conditioner by using low-grade phosphate rock. Background technique [0002] Phosphate rock is an important non-renewable resource and an important industrial raw material for fertilizer and phosphorus chemical industry. China's phosphate rock resources account for about 30% of the world's total reserves, mainly distributed in Yunnan, Hubei, Guizhou, and Sichuan. The resource reserves of these four provinces account for about 76.60% of the country's total. At present, my country's annual consumption of phosphate rock is as high as 70 million tons. Although China's phosphate rock resources are relatively rich, for a long time, people have been mining phosphate rock resources by "mining the rich and abandoning the poor". Moreover, according to the current mining speed, the high-grade phosphate rock with a grade of more than 30% in my coun...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05G3/80
Inventor 石林林维佳熊秋庭王冠雯张艺
Owner SOUTH CHINA UNIV OF TECH