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Method for preparing iron phosphate through two-step hydrochloric acid dissolution of pyrite cinders

A technology of pyrite slag and iron phosphate, applied in the field of comprehensive utilization of solid waste resources, can solve the problems of low utilization rate, meet equipment requirements and low energy consumption, reduce environmental pollution, and reduce production costs

Pending Publication Date: 2022-07-22
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Usually, the leaching rate of iron from sulfuric acid slag is only 50-70%, and the utilization rate is low.

Method used

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  • Method for preparing iron phosphate through two-step hydrochloric acid dissolution of pyrite cinders
  • Method for preparing iron phosphate through two-step hydrochloric acid dissolution of pyrite cinders
  • Method for preparing iron phosphate through two-step hydrochloric acid dissolution of pyrite cinders

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Embodiment 1

[0033] A method for preparing iron phosphate by two-step acid dissolving of pyrite slag by hydrochloric acid method, and its process flow diagram is shown in figure 1 The pyrite slag adopted is the product after high temperature calcination in a factory with pyrite for acid production, and its main component content (mass percentage) is as follows: the iron content (calculated as iron oxide) is 59.81%, the silicon content ( with SiO 2 Calcium (as MgO) 5.44%, magnesium content (as MgO) 2.61%, calcium content (as CaO) 1.91%, sulfur (as sulfate) 1.69%, aluminum content (as Al 2 O 3 Calculation) is 0.85%; it specifically includes the following steps:

[0034] 1) pretreatment: the pyrite slag is washed with water, filtered, dried and ground to obtain slag powder;

[0035] 2) Acid leaching: take 80.00 g of cinder powder and add a hydrochloric acid solution with a concentration of 37 wt %, control the quality of the HCl introduced into it to be 1.4 times the total iron content of ...

Embodiment 2

[0041] A method for preparing iron phosphate by two-step acid dissolving of pyrite slag by hydrochloric acid method. The content (as iron oxide) is 58.81%, the silicon content (as SiO 2 Calcium (as MgO) 5.40%, magnesium content (as MgO) 2.60%, calcium content (as CaO) 1.91%, sulfur (as sulfate) 1.69%, aluminum content (as Al 2 O 3 Calculation) is 0.85%; it specifically includes the following steps:

[0042] 1) pretreatment: the pyrite slag is washed with water, filtered, dried and ground to obtain slag powder;

[0043] 2) Acid leaching: take 80.00 g of slag powder and add a hydrochloric acid solution with a concentration of 37wt%, control the quality of the HCl introduced into it to be 1.4 times the total iron content of the slag powder, pickle at 90°C for 4 hours, and the iron leaching The rate reached 89.32%;

[0044] 3) Acid leaching solution purification: the obtained acid leaching solution is treated with H 2 O 2 The solution (30wt%) was oxidized at room temperature...

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Abstract

The invention discloses a method for preparing iron phosphate through two-step acid dissolution of pyrite cinders by a hydrochloric acid method, which comprises the following steps: firstly, carrying out acid leaching on pyrite cinders powder by adopting a high-concentration acid solution to obtain an acid leaching solution; adding an oxidizing agent for oxidation treatment, and adding alkali liquor to prepare ferric hydroxide colloid; dissolving the ferric hydroxide colloid by adopting acid liquor to obtain a purified ferric chloride solution; and reacting the obtained ferric chloride solution with an ammonium dihydrogen phosphate solution, and adjusting the pH value with alkali liquor after the reaction to obtain the powdery iron phosphate. According to the method, the pyrite cinder is used as a main raw material, a two-step acid dissolution process is adopted, and the ferric chloride solution with high purity can be prepared on the premise that the high iron recovery rate is guaranteed; then reacting with ammonium dihydrogen phosphate, and preparing high-purity iron phosphate without further introduction of conditions such as calcination and the like; the preparation method is simple, convenient to operate, mild in reaction condition and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste resources, and in particular relates to a method for preparing iron phosphate by two-step hydrochloric acid acid dissolution of pyrite slag. Background technique [0002] Iron phosphate is one of the important precursors for the synthesis of lithium iron phosphate. FePO 4 as LiFePO 4 The product after electrochemical delithiation, which is combined with LiFePO 4 Both belong to the orthorhombic crystal system, the structure is similar, the volume change is small, and the iron phosphate itself has excellent electrochemical properties. extensive attention. [0003] Pyrite slag is the product of pyrite slag calcined at high temperature in a boiling furnace. Every 1t of sulfuric acid produced will produce 0.8t of slag, accounting for 1 / 3 of the chemical waste residue. Its main components are iron oxide, ferrous oxide and Silica, etc., containing 20 to 60% iron. At...

Claims

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Application Information

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IPC IPC(8): C01B25/37
CPCC01B25/375C01P2002/72C01P2006/80
Inventor 丁一刚张永晴龙秉文邓伏礼戴亚芬张莉刘生鹏杜治平余莹梁蕾居丽何俊
Owner WUHAN INSTITUTE OF TECHNOLOGY
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