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Method for producing nutrient-type soil heavy metal solidifying agent from low-grade phosphate ore

A low-grade, nutritious technology, applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of low utilization rate of low-grade phosphate rock, to suppress acidity, make full use of resources, and improve utilization rate effect

Active Publication Date: 2013-10-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of method that utilizes low-grade phosphate rock to produce nutritive soil heavy metal solidifying agent, by adopting dolomite, phosphogypsum to activate low-grade phosphate rock, not only solve the problem of low utilization rate of low-grade phosphate rock, but also Reduce the land occupation and environmental pollution caused by a large amount of phosphogypsum stacking, and at the same time make full use of various elements in the raw materials to make a nutrient-type soil heavy metal curing agent containing phosphorus, calcium, silicon, and magnesium, thereby providing calcium-based Provide basis for agricultural resource utilization of industrial solid waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The composition of low-grade phosphate rock produced and stacked by a company in Yunnan and dolomite from a company in Guangxi is as follows:

[0022] components SiO 2 CaO P 2 o 5 Al 2 o 3 Fe 2 o 3 MgO CaF 2 Impurities content / % 31.05 25.78 18.52 4.15 2.98 2.68 1.46 13.38

[0023] components CaO MgO CO 2 al 2 o 3 SiO 2 Fe 2 o 3 Impurities content / % 30.37 21.46 47.47 0.41 0.12 0.04 0.13

[0024] The phosphorus pentoxide content of this low-grade phosphate rock is 18.52%. The low-grade phosphate rock, dolomite, and phosphogypsum were dried at 105°C to constant weight, and then ball-milled with a ball mill and sieved to 200 mesh. According to the apatite (molecular formula (Ca 5 (PO 4 ) 3 (F,Cl,OH)) and dolomite (molecular formula (CaMg[CO 3 ] 2 ) molar ratio of 1:1.25, and add phosphogypsum (calculated as CaSO 4 2H 2 O mass meter) and 3% sodium sulfate (molecul...

Embodiment 2

[0028] The composition of low-grade phosphate rock from a company in Yunnan and dolomite from a company in Guangdong is as follows:

[0029] components SiO 2 CaO P 2 o 5 Al 2 o 3 Fe 2 o 3 MgO CaF 2 Impurities content / % 31.05 25.78 18.52 4.15 2.98 2.68 1.46 13.38

[0030] components CaO MgO CO 2 Al 2 o 3 SiO 2 Fe 2 o 3 Impurities content / % 32.69 19.41 47.05 0.51 0.2 0.14 0.11

[0031] The phosphorus pentoxide content of this low-grade phosphate rock is 18.52%. The low-grade phosphate rock, dolomite, and phosphogypsum were dried at 105°C to constant weight, and then ball-milled with a ball mill and sieved to 200 mesh. According to the apatite (molecular formula (Ca 5 (PO 4 ) 3 (F,Cl,OH)) and dolomite (molecular formula (CaMg[CO 3 ] 2 ) molar ratio of 1:1.5, and add phosphogypsum (calculated as CaSO 4 2H 2 O mass meter) and 2% sodium chloride (molecular formula NaCl), ...

Embodiment 3

[0035] The composition of low-grade phosphate rock from a company in Guizhou and dolomite from a company in Guangdong is as follows:

[0036] components SiO 2 CaO P 2 o 5 al 2 o 3 Fe 2 o 3 MgO CaF 2 Impurities content / % 21.99 35.1 17.39 5.99 1.26 2.66 1.38 14.23

[0037] components CaO MgO CO 2 Al 2 o 3 SiO 2 Fe 2 o 3 Impurities content / % 32.69 19.41 47.05 0.51 0.2 0.14 0.11

[0038] The phosphorus pentoxide content of this low-grade phosphate rock is 17.39%. The low-grade phosphate rock, dolomite, and phosphogypsum were dried at 105°C to constant weight, and then ball-milled with a ball mill and sieved to 200 mesh. According to the apatite (molecular formula (Ca 5(PO 4 ) 3 (F,Cl,OH)) and dolomite (molecular formula (CaMg[CO 3 ] 2 ) in a molar ratio of 1:0.75, and add 17% of phosphogypsum (calculated as CaSO 4 2H 2 O mass meter) and 2.5% calcium chloride (molecular ...

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Abstract

The invention discloses a method for producing a nutrient-type soil heavy metal solidifying agent from low-grade phosphate ore, which comprises the following steps: proportionally mixing main raw materials low-grade phosphate ore, dolomite and phosphogypsum, wherein the mol ratio of the apatite (the molecular formula is Ca5(PO4)3(F,Cl,OH)) to the dolomite (the molecular formula is CaMg(CO3)2) is 1:(0.5-2.25), the addition amount of the phosphogypsum (the molecular formula is CaSO4.2H2O) is 5-25 wt% of the sum of dried low-grade phosphate ore and dolomite; and adding an additive, roasting at 1050-1200 DEG C for 0.5-2 hours, cooling the product, and pulverizing by grinding to obtain the nutrient-type soil heavy metal solidifying agent. The invention has the advantages of wide sources, cheap and accessible raw materials and low energy consumption, and can enhance the utilization ratio of the low-grade phosphate ore, thereby solving the problems of more rich phosphate ore and less lean phosphate ore in China.

Description

technical field [0001] The invention relates to a method for producing a nutritional soil heavy metal curing agent suitable for acidic soil by using low-grade phosphate rock, dolomite and phosphogypsum as raw materials and under the action of certain additives. Background technique [0002] Phosphate rock is an important non-renewable resource and an important raw material for fertilizer and phosphorus chemical industry. China's phosphate rock resources account for about 30% of the world's total, mainly concentrated in Yunnan, Hubei, Guizhou, and Sichuan, and their resource reserves 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 is rich in phosphate rock resources, most high-grade phosphate rock has been used to make phosphoric acid for a long time, and phosphoric acid is mainly used to make fertilizers. According to the current mining speed, my country's high-grad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/12
CPCY02W30/91
Inventor 石林李咏丽
Owner SOUTH CHINA UNIV OF TECH
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