A method for recovering blue iron ore from sludge incineration ash

A technology of sludge incineration and blue iron ore, applied in separation methods, chemical instruments and methods, combustible gas purification/transformation, etc., can solve problems such as long time, and achieve the effect of convenient operation, simple process flow, and elimination of interference

Active Publication Date: 2022-04-05
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent does not enrich and remove impurities for phosphate in the stream, and the high organic phosphorus content in the stream cannot be converted into blue iron ore, thus limiting the formation of blue iron ore; sulfide exists in high concentration, and an excessive supply of iron salt is required. After all the sulfide reaction is converted into iron sulfide, blue iron ore begins to form; and in the experiment, the sludge needs to be kept under anaerobic or anoxic conditions for 20 to 30 days, and the experiment takes a long time

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  • A method for recovering blue iron ore from sludge incineration ash
  • A method for recovering blue iron ore from sludge incineration ash

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Embodiment 1

[0038] A method for recovering blue iron ore from sludge incineration ash, the processing object is sludge incineration ash of a sewage treatment plant, X-ray fluorescence spectrum (XRF) detection shows that the mass percentage content of phosphorus in the sludge incineration ash is 5.2 %. Phosphorus is recovered from this kind of sludge incineration ash to prepare blue iron ore, such as figure 1 ,2 As shown, the method specifically includes the following steps:

[0039] (1) Mix and heat 100g of sludge incineration ash and 2L of hydrochloric acid solution (0.5mol / L) (that is, the liquid-solid ratio is 0.02L / g), and turn over and leaching at 30°C (the frequency of turning and leaching refers to what is often used in the prior art) parameters, the same below) after 0.5h, the mixture was filtered to obtain leaching filtrate and leaching filter residue.

[0040] (2) Get the leach filtrate that 100mL step (1) obtains and 4g magnesium iron hydrotalcite (that is, the liquid-solid r...

Embodiment 2

[0048] The invention discloses a method for recovering blue iron ore from sludge incineration ash, and the processing object is the sludge incineration ash of a certain sewage treatment plant. X-ray fluorescence spectrum (XRF) detection showed that the phosphorus content of the sludge incineration ash was 5.2wt%. Reclaim phosphorus from this kind of sludge incineration ash, prepare blue iron ore, specifically comprise the following steps:

[0049] (1) Mix and heat 100g of sludge incineration ash and 2L of hydrochloric acid solution (0.3mol / L) (that is, the liquid-solid ratio is 0.02L / g), and after flipping and leaching at 55°C for 0.5h, filter the mixture to obtain the leaching filtrate and leached filter residue.

[0050] (2) Take 150mL of the leachate obtained in step (1) and 6g of magnesium iron hydrotalcite (that is, the liquid-solid ratio is 0.025L / g) in the reactor, and adjust the pH value of the mixed solution to 5 with 0.2mol / L sodium hydroxide solution , and mechani...

Embodiment 3

[0058] The invention discloses a method for recovering blue iron ore from sludge incineration ash, and the processing object is the sludge incineration ash of a certain sewage treatment plant. X-ray fluorescence spectrum (XRF) detection showed that the phosphorus content of the sludge incineration ash was 5.3wt%. Reclaim phosphorus from this kind of sludge incineration ash, prepare blue iron ore, specifically comprise the following steps:

[0059] (1) Mix and heat 100g of sludge incineration ash and 1L of hydrochloric acid solution (0.3mol / L) (that is, the liquid-solid ratio is 0.01L / g), and after leaching at 55°C for 2 hours, filter the mixture to obtain the leaching filtrate and Leach out the filter residue.

[0060] (2) Take 250mL of the leaching solution obtained in step (1) and 10g of magnesium iron hydrotalcite (that is, the liquid-solid ratio is 0.025L / g) in the reactor, and adjust the pH value of the mixed solution to 6 with 0.2mol / L sodium hydroxide solution , and m...

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Abstract

The invention relates to a method for recovering blue iron ore from sludge incineration ash, which comprises the following steps: (1) mixing sludge incineration ash with acid solution and heating for phosphorus leaching, and then filtering and separating to obtain leaching filtrate and leaching filter residue; (2) adjust the pH value of the leaching filtrate with lye, then add an adsorbent to carry out the adsorption of phosphorus, and then obtain the adsorption filtrate and adsorption filter residue through filtration and separation; (3) mix the adsorption filter residue with lye and carry out phosphorus removal (4) under anaerobic environment, add ferrous ions to the desorption filtrate, and adjust the pH value of the desorption filtrate to react, and obtain filter residue and filtrate, and the filter residue is washed and dried to obtain blue iron ore. Compared with the prior art, the invention eliminates the interference of other elements in the sludge incineration ash, obtains high-quality blue iron ore products, can alleviate the shortage of phosphorus resources, and has simple process flow and convenient operation.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of solid waste resources, in particular to a method for recovering blue iron ore from sludge incineration ash. Background technique [0002] Phosphorus (P) is an essential element in living organisms and plays a vital role in life activities. As the global population continues to increase, so does the demand for phosphorus in agriculture and industry. However, phosphorus is a limited and non-renewable resource. About 20 million tons of phosphorus ore are mined every year, and the price of phosphorus continues to rise. At the same time, high-quality and easy-to-mine phosphate rocks are gradually depleted, and phosphate rocks with high impurities and difficult mining will be widely used, which will further increase the production cost of phosphorus products. According to the current exploitation and use speed of phosphorus, the phosphorus resources with mining economic benefits can only la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37B01J20/34
CPCC01B25/375B01J20/3483
Inventor 章骅何品晶杨怡君邵立明吕凡
Owner TONGJI UNIV
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