Method for preparing industrial ferrous sulfate and zinc sulfate by using pyrite cinders

A technology of pyrite slag and ferrous sulfate, which is applied to the removal of zinc sulfate, ferric sulfate, and solid waste, and can solve the problems of iron-containing grade decline and lack of economic results

Inactive Publication Date: 2011-07-06
张胜勇
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Problems solved by technology

However, due to the low iron content, high sulfur content, silicon dioxide, and non-ferrous metals, especially in recent years, with the development of the sulfuric acid industry, the demand for pyrite has also inc

Method used

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Embodiment 1

[0021] A method for preparing industrial ferrous sulfate and zinc sulfate with pyrite slag, comprising the following specific steps:

[0022] Step A: Take 500kg of pyrite slag, calculate the content of iron, copper, lead and zinc in it, grind it into 80-100 mesh coarse powder, put it into corrosion-resistant reactor 1, fully react with excess sulfuric acid, and filter , obtain sulfuric acid, ferrous sulfate, cuprous sulfate, mixed solution one of zinc sulfate and leaded filter cake;

[0023] Step B: adding an appropriate amount of ferrous hydroxide to neutralize excess sulfuric acid in the above mixed solution one;

[0024] Step C: Then send the product obtained in step B into a vacuum distiller for vacuum distillation to a saturated solution of ferrous sulfate, and cool to 25°C. At this time, the solubility of ferrous sulfate in water is 26.3, and copper sulfate forms copper sulfate pentahydrate , its solubility is 25.0, zinc sulfate forms zinc sulfate heptahydrate, and its ...

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Abstract

The invention provides a method for preparing industrial ferrous sulfate and zinc sulfate by using pyrite cinders. The method comprises the following steps of: fully reacting the pyrite cinders with excessive sulfuric acid, filtering to obtain a mixed solution I containing sulfuric acid, ferrous sulfuric, cuprous sulfate and zinc sulfate, and a lead-containing filter cake; adding an appropriate amount of ferrous hydroxide into the mixed solution I for neutralizing the excessive sulfuric acid; distilling the solution under a reduced pressure into a saturated ferrous sulfate solution, cooling the saturated ferrous sulfate solution to 25 DEG C until the ferrous sulfate is supersaturated, separating a large quantity of crystals out, and filtering to obtain a ferrous sulfate filter cake and a mixed solution II containing cuprous sulfate pentahydrate, zinc sulphate heptahydrate and a small amount of ferrous sulfates; washing, drying and smashing the ferrous sulfate filter cake to obtain a ferrous sulfate product; heating the mixed solution II to 30-40 DEG C, precipitating zinc sulfate in a form of zinc sulfate heptahydrate crystals, and filtering to obtain zinc sulfate heptahydrate crystals and a mixed solution III containing copper sulfate and ferrous sulfate; and washing, drying and smashing the zinc sulfate heptahydrate crystals to obtain a zinc sulfate crystal product.

Description

technical field [0001] The invention relates to the technical field of treatment and comprehensive utilization of three industrial wastes, in particular to a method for preparing industrial ferrous sulfate and zinc sulfate from pyrite slag. Background technique [0002] Pyrite ore slag is a waste residue discharged from the process of producing sulfuric acid by using pyrite or sulfur-containing tailings as raw materials. Its main components are Fe 55%-60%, FeO 3%-6%, SiO2 8.2% ~12.65%, SO 17%~0.76%, CuO 2%~0.427%, Pb 0.015%~0.045%, ZnO 0.03%~0.008%, and Au, Ag and other associated elements. [0003] Because pyrite slag contains a large amount of iron, it is generally used as a raw material for ironmaking. However, due to the low iron content, high sulfur content, silicon dioxide, and non-ferrous metals, especially in recent years, with the development of the sulfuric acid industry, the demand for pyrite has also increased. Pyrite is also used as a raw material for sulfuric...

Claims

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Application Information

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IPC IPC(8): C01G49/14C01G9/06B09B3/00
Inventor 张胜勇
Owner 张胜勇
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