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Method for utilizing waste phosphoric acid generated in acid pickling of electronic materials

An electronic material and waste phosphoric acid technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of difficult sludge dewatering, difficult post-processing, waste of acid and alkali, etc., and achieve process parameters that are easy to control, The effect of less harm to the environment and low cost of materials

Inactive Publication Date: 2016-12-14
宿迁久巨环保科技有限公司
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Problems solved by technology

However, the sludge produced after precipitation is difficult to dehydrate, not easy to dry, and difficult to post-process. In most cases, it is piled up for treatment, which not only takes up a lot of land, but also causes secondary pollution. At the same time, this method wastes a lot of acid and alkali.

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  • Method for utilizing waste phosphoric acid generated in acid pickling of electronic materials

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Embodiment

[0017] Adjust the waste phosphoric acid to a concentration of 10%-30%, divide it into 2 parts, slowly add sodium hydroxide to one part of the solution while stirring, and stir for 2 hours at room temperature until the precipitate dissolves (ph=14), then slowly dissolve it Add it to another adjusted waste phosphoric acid, control pH4.5-9.5 according to the requirements of phosphate products, stir slowly for 1 hour at room temperature, filter and wash, dry the filter residue at 105°C, the filter residue is aluminum phosphate, and the remaining When the filtrate is at 105°C, the sodium phosphate series products can be obtained by conventional crystallization.

[0018] Principle of the present invention:

[0019] al 3+ +H 3 PO 4 +4NaOH=NaAlO 2 +Na 3 PO 4

[0020] NaAlO 2 +Al 3+ +H 3 PO 4 =2AlPO 4 ↓+NaH 2 PO 4

[0021] 2NaAlO 2 +Al 3+ +H 3 PO 4 =3AlPO 4 ↓+Na 2 HPO 4

[0022] 3NaAlO 2 +Al 3+ +H 3 PO 4 = 4AlPO 4 ↓+Na 3 PO 4

[0023] h 3 PO 4 +NaOH=Na ...

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Abstract

A method for utilizing waste phosphoric acid generated in acid pickling of electronic materials comprises the following steps that firstly, the concentration of waste phosphoric acid is regulated to be 10-30% the original concentration, and the solution is separated into a solution A and a solution B; secondly, sodium hydroxide is slowly added in the part A solution while stirring is carried out, stirring is carried out for 2 h at the room temperature until precipitation is dissolved, and a solution C is obtained; thirdly, the solution C is slowly added into the solution B, the ph value is controlled to range from 4.5 to 9.5, slow stirring is carried out for 1 h at the room temperature, and a solution D is obtained; fourthly, the solution D is filtered and washed, and filter residues are dried for 30-40 min at 105 DEG C, wherein the filter residues are aluminum phosphate; fifthly, the remaining filter liquor obtained in the fourth step is crystallized with the temperature maintained at 105 DEG C, and sodium phosphate series products are obtained. The method is simple, adopted materials are low in cost, the resources of the waste solution can be fully utilized, the parameters of the whole technology are convenient to control, enterprises can conveniently carry out the operation of recycling waste solutions, and popularization is convenient.

Description

technical field [0001] The invention relates to a method for reusing phosphoric acid, in particular to a method for utilizing waste phosphoric acid from pickling of electronic materials. Background technique [0002] The phosphoric acid waste liquid pickling of electronic materials mainly contains aluminum ions and phosphoric acid. For a long time, the treatment method of the waste liquid is the dilution neutralization method, that is, the waste liquid is diluted to a lower concentration and then neutralized with calcium hydroxide to produce calcium aluminum phosphate precipitation, which is then treated as solid waste. However, the sludge produced after precipitation is difficult to dehydrate, difficult to dry, and difficult to post-process. In most cases, it is piled up for treatment, which not only takes up a lot of land, but also causes secondary pollution. At the same time, this method wastes a lot of acid and alkali. Contents of the invention [0003] The purpose of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/36C01B25/30
CPCC01B25/36C01B25/30
Inventor 薛咏立杨箫谢雄华
Owner 宿迁久巨环保科技有限公司
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