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Method for preparing high-purity iron phosphate from pyrite cinder

A technology of pyrite slag and high-purity phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of long process flow, large equipment investment, low utilization rate of pyrite slag, etc. To achieve the effect of shortening the process flow, improving the utilization rate, and reducing the cost of equipment investment

Pending Publication Date: 2022-07-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to propose a method for preparing high-purity ferric phosphate by using pyrite slag, which solves the problem of long process flow, large equipment investment and sulfur Technical problem of low utilization rate of iron ore slag

Method used

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  • Method for preparing high-purity iron phosphate from pyrite cinder
  • Method for preparing high-purity iron phosphate from pyrite cinder

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Wash the pyrite slag with deionized water according to the solid-to-liquid ratio of 20g / L, dry it at 120°C and grind it with a mortar for 30 minutes; weigh the glucose according to 50% of the mass of the obtained slag after grinding, put the pyrite slag into The slag was mixed with glucose, and calcined at 600°C for 4h in a tube furnace under nitrogen atmosphere; the iron content in the obtained sample after calcination was analyzed, and 20% dilute phosphoric acid was measured according to Fe:P=1:2 (molar ratio). , the calcined slag was mixed with dilute phosphoric acid; the mixed suspension was placed in a three-necked flask for 3 hours at 100 °C; after the reaction was completed, the resulting solution was subjected to suction filtration and washing; the filtrate obtained in the previous step was added to ammonia water to adjust pH=2.5 , and added polyacrylamide (mass concentration 0.02%), reacted for 2 hours and then filtered; analyze the iron content in the aforement...

Embodiment 2

[0045] The pyrite slag was washed with deionized water according to the solid-liquid ratio of 30g / L, dried at 120°C and ground with a mortar for 30 minutes; the glucose was weighed according to 20% of the mass of the obtained slag after grinding, and the pyrite slag was The slag was mixed with glucose, and calcined at 900°C for 2h in a tube furnace under nitrogen atmosphere; the iron content in the samples obtained after calcination was analyzed, and 40% dilute phosphoric acid was measured according to Fe:P=1:1.6 (molar ratio). , the calcined slag was mixed with dilute phosphoric acid; the mixed suspension was placed in a three-necked flask for 1 h at 150°C; after the reaction was completed, the resulting solution was subjected to suction filtration and washing; the filtrate obtained in the previous step was added to ammonia water to adjust pH=2.8 , and added polyacrylamide (mass concentration 0.02%), reacted for 2 hours and then filtered; analyze the iron content in the aforem...

Embodiment 3

[0047] The pyrite slag was washed with deionized water according to the solid-liquid ratio of 25g / L, dried at 120°C and ground with a mortar for 30 minutes; the glucose was weighed according to 10% of the mass of the obtained slag after grinding, and the pyrite slag was The slag was mixed with glucose, and calcined at 700°C for 6h in a tube furnace under nitrogen atmosphere; the iron content in the obtained sample after calcination was analyzed, and 60% dilute phosphoric acid was measured according to Fe:P=1:1.2 (molar ratio). , the calcined slag was mixed with dilute phosphoric acid; the mixed suspension was placed in a three-necked flask to react at 120 °C for 6 h; after the reaction was completed, the resulting solution was subjected to suction filtration and washing; the filtrate obtained in the previous step was added to ammonia water to adjust pH=4.0 , and added polyacrylamide (mass concentration 0.02%), reacted for 2 hours and then filtered; analyze the iron content in t...

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Abstract

The invention discloses a method for preparing high-purity iron phosphate from pyrite cinder, and relates to the technical field of high-value utilization of industrial solid wastes. The method for preparing the high-purity iron phosphate from the pyrite cinders comprises the following steps: cleaning, drying and crushing the pyrite cinders to remove soluble components in the pyrite cinders; mixing the pyrite cinder with a carbon source, and calcining in an inert atmosphere; mixing and reacting the calcined pyrite cinder with dilute phosphoric acid to obtain an acid leaching solution, and filtering the acid leaching solution to obtain filtrate and filter residues; adjusting the pH value of the filtrate, and adding a flocculant into the filtrate to purify the filtrate; adding hydrogen peroxide into the purified filtrate; and washing and drying the obtained product to obtain iron phosphate. The method has the advantages that the technological process is short, the equipment investment cost is low, an alkali leaching procedure is not needed, the acid used in the acid leaching process is dilute phosphoric acid, the reaction is mild, the dilute phosphoric acid can be industrial byproduct acid, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of high-value utilization of industrial solid waste, in particular to a method for preparing high-purity iron phosphate by using pyrite slag. Background technique [0002] With the formulation of the dual carbon goals, electric vehicles and large-scale energy storage are gaining more and more attention. Lithium iron phosphate has the advantages of high energy density, good cycle stability, low cost, and environmental friendliness, and the market demand is rapidly increasing. In the current lithium iron phosphate production process, the solid-phase process with iron phosphate as the precursor is the mainstream. The physical and chemical properties of iron phosphate, such as elemental composition and particle size, are crucial to the performance of the final lithium iron phosphate. The preparation of iron phosphate is mainly based on soluble iron salt and phosphate as raw materials, and is prepared by co-prec...

Claims

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Application Information

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IPC IPC(8): C01B25/37
CPCC01B25/375C01P2002/72C01P2006/80Y02E60/10
Inventor 吴振国李浩宇郭孝东宋扬钟本和
Owner SICHUAN UNIV
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