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Pyrite cinder treatment method

A technology of pyrite slag and treatment method, which is applied in the direction of improving process efficiency and the like, can solve problems such as difficult treatment and large amount of dilute acid, and achieve the effects of reducing silicon content, simplifying treatment process and reducing production cost.

Inactive Publication Date: 2013-01-02
山东明瑞化工集团有限公司
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AI Technical Summary

Problems solved by technology

In the process of phosphate fertilizer production, it is a kind of waste water to be treated. Generally, the fluorine content is 5-10%. It is generally used to make fluorosilicate, but it produces a large amount of dilute acid and is not easy to handle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The present invention will be further described below in conjunction with the examples, and the following examples are intended to illustrate the present invention rather than further limit the present invention. First embodiment of the present invention, its step is: put into the reaction tank after mixing pyrite slag and the hydrofluoric acid that content is 5% by the ratio of 1g:3mL, carry out 4 hours in normal temperature Reaction, the reacted mixed material is filtered and separated through a filter. The filter cake is the treated pyrite slag, and the separated waste liquid is returned to the fluorine recovery and washing system to be mixed with the newly generated washing wastewater before being used to treat the pyrite slag.

[0010] In this embodiment, the hydrofluoric acid with a content of 5% is set as the fluorine recovery washing water generated by the tail gas washing system in the phosphoric acid production process.

[0011] In this embodiment, the pyrite...

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PUM

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Abstract

The invention relates to a pyrite cinder treatment method which comprises the following steps: mixing pyrite cinder and hydrofluoric acid of which the content is 5-10% according to 1g:3-10mL, and then adding into a reaction tank; reacting at normal temperature for 1-4 hours; and separating out the solid content in the mixture after reaction. When the iron content in the pyrite cinder can not meet the iron making requirement, the reaction of hydrofluoric acid and silicon dioxide can effectively reduce the silicon content in the pyrite cinder, so that the beneficiation and conglomeration calcining method may be not used any more, thereby simplifying the pyrite cinder treatment process and reducing the production cost.

Description

technical field [0001] The invention relates to a method for treating pyrite slag, in particular to a method for treating pyrite slag by using the fluorine recovery washing water produced in the phosphoric acid production process as a raw material. Background technique [0002] Pyrite ore slag is a waste residue discharged from the process of producing sulfuric acid using pyrite or sulfur-containing tailings as raw materials. It is an important chemical and chemical industry intermediate product, the main components are iron oxide and silicon dioxide, and it is mainly used as an ingredient in ironmaking, steelmaking and cement. In recent years, with the development of the sulfuric acid industry, the demand for pyrite has also increased, and some pyrite with low sulfur content has also been used as raw materials for sulfuric acid production, so the iron grade in the slag is also increasing. Correspondingly, it cannot be directly used for ironmaking, so that the ideal economi...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B7/04
CPCY02P10/20
Inventor 王明悦代文彬杨万军李吉山
Owner 山东明瑞化工集团有限公司
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