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Technique for preparing iron concentrate from pyrite cinder by nitric acid-hydrochloric acid combined treatment

A technology of pyrite slag and iron concentrate, which is applied to the improvement of process efficiency, fertilizer mixture, fertilization device, etc., can solve the problems of secondary pollution, low iron utilization rate, high cost, etc., to achieve the removal of impurities and improve Effect of desulfurization rate and iron loss increase

Inactive Publication Date: 2014-04-16
KAIFENG UNIV
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Problems solved by technology

At present, experts and scholars have developed technologies such as using pyrite slag to produce water purifiers, iron-based dyes, and cement additives. However, due to technical and market reasons, the slag cannot be processed on a large scale.
[0004] In order to realize the idea of ​​using slag as a raw material for ironmaking, experts and scholars have carried out a lot of research. In recent years, some breakthroughs have been achieved, mainly reflected in the preparation of high-grade magnetite from pyrite slag and the production of oxide balls. However, these technologies have the disadvantages of low iron utilization rate, high cost and secondary pollution, and cannot fundamentally solve the problem of resource utilization of cinder

Method used

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  • Technique for preparing iron concentrate from pyrite cinder by nitric acid-hydrochloric acid combined treatment
  • Technique for preparing iron concentrate from pyrite cinder by nitric acid-hydrochloric acid combined treatment
  • Technique for preparing iron concentrate from pyrite cinder by nitric acid-hydrochloric acid combined treatment

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Experimental program
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Effect test

Embodiment Construction

[0045] 1. Main components and content of pyrite cinder

[0046]

[0047] 2. Acid leaching dosage, reaction time, temperature, etc.

[0048] Calculation of nitric acid dosage:

[0049]

[0050] M - the amount of substance (mol)

[0051] In order to remove impurities to the greatest extent, several times the theoretical amount of nitric acid was used in the test, which is called the excess coefficient of nitric acid and is represented by R.

[0052] Through experiments, it is determined that the optimum technological condition of the acid leaching process is: the concentration of nitric acid is 6mol L -1 , time 60min, temperature 50℃, excess coefficient=15.

[0053] 3. Acid hydrolysis process

[0054] Total iron content in acid leaching residue: 55%, total sulfur content <0.1%

[0055] m HCl = M Fe ×1.1

[0056] The optimized process conditions are determined as: hydrochloric acid concentration 10.6mol L -1 , Reaction time 120min, hydrochloric acid excess coeffici...

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Abstract

The invention discloses a technique for preparing iron concentrate from pyrite cinder by nitric acid-hydrochloric acid combined treatment, which is characterized by comprising the following steps: detecting the component content in the pyrite cinder; and if the SiO2 content in the pyrite cinder is greater than 10%, using a double-acid process, and if the SiO2 content in the pyrite cinder is smaller than 10%, adopting a nitric acid process. The technique can utilize the iron resource and eliminate pollution, thereby implementing clean production in pyrite acid making industry.

Description

technical field [0001] The invention belongs to the cross field of chemical industry and metallurgy, and specifically relates to a process for producing iron concentrate by using nitric acid and hydrochloric acid to jointly treat pyrite slag, which is mainly suitable for producing sulfuric acid produced by using pyrite as raw material. Recycling of slag, leaching slag with nitric acid to remove sulfur, arsenic, etc., further dissolving iron concentrate with hydrochloric acid, acid solution is used to produce nitro compound fertilizer, acid insoluble matter (main component silica ) are directly used in building materials without secondary pollution. Background technique [0002] The 12th five-year plan of the national petrochemical industry clearly points out that it is necessary to increase energy conservation and emission reduction, improve resource utilization, and increase resource recycling of waste in the chemical industry. "Hydrochloric acid treatment of pyrite slag t...

Claims

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Application Information

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IPC IPC(8): C22B1/00C05G1/00
CPCY02P10/20
Inventor 石海洋占桂荣刘明海姬学亮
Owner KAIFENG UNIV
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