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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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

Method used

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Example Embodiment

[0009] Hereinafter, the present invention will be further described with reference to the embodiments. The following embodiments are intended to illustrate the present invention but not to further limit the present invention. In the first embodiment of the present invention, the steps are as follows: mix the pyrite slag and 5% hydrofluoric acid in a ratio of 1g:3mL, and put them into the reaction tank, and carry out 4 hours at room temperature. In the reaction, the reacted mixture is filtered and separated through a filter. The filter cake is the treated pyrite cinder, and the separated waste liquid is returned to the fluorine recovery washing system and mixed with the newly generated washing wastewater before being used to treat the pyrite cinder.

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

[0011] In this embodiment, th...

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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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