Method for preparing phosphate and iron oxide red by utilizing phosphated residue

A technology of iron oxide red and phosphate, applied in the field of phosphating slag treatment, can solve the problems of zinc phosphate precipitation, secondary pollution, waste of resources, etc., and achieve the effects of saving phosphorus resources, enriching economic benefits, and huge market capacity

Inactive Publication Date: 2013-11-20
丁忠华
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Problems solved by technology

In addition, if the reaction process is not properly controlled, it will cause over-neutralization, resulting in the precipitation of excess zinc phosphate and the formation of zinc-rich phosphating slag
[0004] At present, there is no company on the market that specializ...

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  • Method for preparing phosphate and iron oxide red by utilizing phosphated residue

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing, and the structure and principle of this device are very clear to those skilled in the art. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] Such as figure 1 Shown, a kind of processing of invention utilizes phosphating slag to become the method for phosphate and iron oxide red, and the main component of phosphating slag is FePO 4 , the specific processing and utilization steps are as follows:

[0022] a.Na 2 CO 3 with FePO 4 reaction

[0023] to FePO 4 Na 2 CO 3 To PH=12, react for 1 hour to make the raw materials react completely, the reaction chemical reaction equation is:

[0024] 2FePO 4 + 3Na 2 CO 3 + 3H 2 O = 2Fe(OH) 3 + 2Na 3 PO 4 + 3CO 2

[0025] b.Fe(OH) 3 converted to Fe 2 o 3

[0026] Above-mentioned reaction product is...

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Abstract

The invention relates to the field of phosphated residue treatment, and in particular relates to a method for preparing phosphate and iron oxide red by utilizing phosphated residue. The iron phosphate phosphated residue is treated and reutilized by using sodium carbonate, and the method comprises the steps of reacting, insulating and filtering, separating solid and liquid to obtain iron oxide red, and adding phosphoric acid or sodium hydroxide to prepare phosphate. A brand-new development direction for effectively treating and regenerating the phosphated residue can be provided. According to the method for treating the phosphated residue, tens of thousands of waste can be recycled every year, massive phosphor resource can be saved, manpower, materials and financial resources can be saved, environment can be improved, and resources can be protected; and the produced phosphate and iron oxide red are completely in accordance with the national standard, are suitable for the washing industry and dyeing industry, has huge market capacity and great economical benefit.

Description

[technical field] [0001] The invention relates to the field of phosphating slag treatment, in particular to a method for processing and utilizing phosphating slag to form phosphate and iron oxide red. [Background technique] [0002] The main component of phosphating slag is a mixture of zinc phosphate and iron phosphate. It is one of the inevitable products when the phosphating solution reacts with the metal surface. The reaction mechanism is that metal Fe and H 3 PO 4 After contact, a chemical reaction occurs on the surface, and the reaction generates Fe(H 2 PO 4 ) 2 and H 2 , H 2 Released in gaseous form, under the condition of oxygen in the air, Fe(H 2 PO 4 ) 2 Further reaction occurs, and the reaction obtains phosphating slag FePO 4 and H 2 O. [0003] When the iron and steel parts are in contact with the phosphating solution, the iron is firstly dissolved by the acid, and part of the dissolved iron ions participate in the film-forming reaction to form the p...

Claims

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Application Information

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IPC IPC(8): C01B25/26C01G49/06B09B3/00
Inventor 丁忠华
Owner 丁忠华
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