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Treatment process for preparing polyferric sulfate from metal product surface waste sulfuric acid

A technology for polymerizing ferric sulfate and metal products, which is applied in the direction of ferric sulfate, which can solve the problems of complex treatment process, low yield of polymerized ferric sulfate, and poor stability, and achieve high yield, resource reuse, and good stability Effect

Pending Publication Date: 2021-03-30
江苏荣信环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The treatment process of making polyferric sulfate from waste sulfuric acid on the surface of traditional metal products is complicated, and the final polyferric sulfate obtained has a low yield and poor stability. Therefore, an improved technology is urgently needed to solve the problems existing in the prior art. this question of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The waste sulfuric acid on the metal product surface of the present embodiment is made into the processing technology of polyferric sulfate, comprises the following steps:

[0027] Step 1: pickling the metal product, using sulfuric acid with a concentration of 60% to react, and collecting the waste sulfuric acid after pickling;

[0028] Step 2: Heat the temperature to 80°C for 2 hours, then cool down naturally until it reaches normal temperature;

[0029] Step 3: Add the heated waste sulfuric acid into the reaction kettle, then add the iron filings after the water washing operation into the reaction kettle, set the temperature to 120°C, the speed to 200r / min, and the negative pressure to 0.25MPa. Reaction 20min;

[0030] Step 4: discharge the waste sulfuric acid into the filter, filter the waste sulfuric acid, and collect the filtrate;

[0031] Step 5: Then add the filtrate into the mixer, and add the oxidant into the mixer, set the temperature to 60°C, set the speed ...

Embodiment 2

[0034] The waste sulfuric acid on the metal product surface of the present embodiment is made into the processing technology of polyferric sulfate, comprises the following steps:

[0035] Step 1: pickling the metal product, using sulfuric acid with a concentration of 60% to react, and collecting the waste sulfuric acid after pickling;

[0036] Step 2: Heat the temperature to 90°C for 2 hours, then cool down naturally until it reaches normal temperature;

[0037] Step 3: Add the heated waste sulfuric acid into the reaction kettle, then add the iron filings after the water washing operation into the reaction kettle, set the temperature to 130°C, the speed to 150r / min, and the negative pressure to 0.25MPa. React for 30 minutes;

[0038] Step 4: discharge the waste sulfuric acid into the filter, filter the waste sulfuric acid, and collect the filtrate;

[0039] Step 5: Then add the filtrate into the mixer, and add the oxidant into the mixer, set the temperature to 70°C, set the ...

Embodiment 3

[0042] The waste sulfuric acid on the metal product surface of the present embodiment is made into the processing technology of polyferric sulfate, comprises the following steps:

[0043] Step 1: pickling the metal product, using sulfuric acid with a concentration of 60% to react, and collecting the waste sulfuric acid after pickling;

[0044] Step 2: Heat the temperature to 80°C for 3 hours, then cool down naturally until it reaches normal temperature;

[0045] Step 3: Add the heated waste sulfuric acid into the reaction kettle, then add the iron filings after the water washing operation into the reaction kettle, set the temperature to 130°C, the speed to 200r / min, and the negative pressure to 0.25MPa, continuously React for 30 minutes;

[0046] Step 4: discharge the waste sulfuric acid into the filter, filter the waste sulfuric acid, and collect the filtrate;

[0047] Step 5: Then add the filtrate into the mixer, and add the oxidant into the mixer, set the temperature to 6...

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Abstract

The invention discloses a treatment process for preparing polyferric sulfate from waste sulfuric acid on the surface of a metal product. The process comprises the following steps: carrying out acid washing, adding heated waste sulfuric acid into a reaction kettle, adding scrap iron into the reaction kettle, filtering the waste sulfuric acid, adding filtrate into a stirrer, and adding an oxidant into the stirrer to obtain a ferric iron solution; and adding the ferric iron solution into a reaction stirrer, introducing water vapor in an environment with the temperature of 100-110 DEG C, setting the rotating speed to be 180-200 r / min, continuing for 25-30 min, carrying out primary hydrolysis, then raising the temperature to be 150-160 DEG C, introducing water vapor again, setting the rotatingspeed to be 250-300 r / min, continuing for 10-15 min, then reducing the temperature to be 60-70 DEG C, introducing water vapor, and completely carrying out hydrolysis reaction to obtain polyferric sulfate. According to the invention, the process is simple, and the finally obtained polyferric sulfate is higher in yield, better in stability, environmentally friendly, free of pollution and capable ofachieving resource reutilization compared with a traditional mode.

Description

technical field [0001] The invention relates to the technical field of preparing polymeric ferric sulfate from waste acid, in particular to a process for preparing polymeric ferric sulfate from waste sulfuric acid on the surface of metal products. Background technique [0002] The treatment process of making polyferric sulfate from waste sulfuric acid on the surface of traditional metal products is complicated, and the final polyferric sulfate obtained has a low yield and poor stability. Therefore, an improved technology is urgently needed to solve the problems existing in the prior art. of this problem. Contents of the invention [0003] The purpose of the present invention is to provide a treatment process for making polyferric sulfate from waste sulfuric acid on the surface of metal products. Reuse of resources to solve the problems raised in the background art above. [0004] In order to achieve the above object, the present invention provides the following technical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14
CPCC01G49/14
Inventor 施荣标
Owner 江苏荣信环保科技有限公司