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Metal product surface sludge ferrous chloride recovery treatment process

A technology for ferrous chloride and metal products, applied in water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, metallurgical wastewater treatment, etc. Low-level problems, to achieve the effect of high crystal purity and simple processing technology

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 purity of ferrous chloride obtained from traditional metal product surface sludge ferrous chloride recovery treatment is low, and the sludge cannot be directly used, and subsequent treatment processes are required to realize reuse. Therefore, an improved technology is urgently needed to solve the problem of existing technologies. this problem in the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The metal product surface sludge ferrous chloride recycling process that the present embodiment adopts comprises the following steps:

[0027] Step 1: Collect the sludge on the surface of the metal product and pickle it to obtain a mixture of sludge and waste acid;

[0028] Step 2: Connect the mixture of sludge and waste acid to the evaporation tank, set the negative pressure of the evaporation tank to 0.35MPa, set the temperature to 40°C, and set the speed to 40r / min. When the concentration of ferrous chloride remains unchanged , the negative pressure of the evaporation tank is 0.5MPa, the temperature rises to 55°C, and the rotation speed is set to 55r / min, until the concentration of ferrous chloride remains unchanged, the pressure of the evaporation tank is released, and the internal ferrous chloride is naturally cooled, and the a small amount of crystallization;

[0029] Step 3: Set the negative pressure of the evaporating tank to 0.65MPa, and set the temperature to...

Embodiment 2

[0034] The metal product surface sludge ferrous chloride recycling process that the present embodiment adopts comprises the following steps:

[0035] Step 1: Collect the sludge on the surface of the metal product and pickle it to obtain a mixture of sludge and waste acid;

[0036] Step 2: Connect the mixture of sludge and waste acid to the evaporation tank, set the negative pressure of the evaporation tank to 0.35MPa, set the temperature to 50°C, and set the speed to 45r / min. When the concentration of ferrous chloride remains unchanged , the negative pressure of the evaporation tank is 0.5MPa, the temperature rises to 60°C, and the rotation speed is set to 65r / min, until the concentration of ferrous chloride remains unchanged, the pressure of the evaporation tank is released, and the internal ferrous chloride is naturally cooled, and the a small amount of crystallization;

[0037] Step 3: Set the negative pressure of the evaporation tank to 0.65MPa, and set the temperature to...

Embodiment 3

[0042] The metal product surface sludge ferrous chloride recycling process that the present embodiment adopts comprises the following steps:

[0043] Step 1: Collect the sludge on the surface of the metal product and pickle it to obtain a mixture of sludge and waste acid;

[0044] Step 2: Connect the mixture of sludge and waste acid to the evaporation tank, set the negative pressure of the evaporation tank to 0.35MPa, set the temperature to 40-50°C, and set the speed to 45r / min. After changing, the negative pressure of the evaporation tank is 0.5MPa, the temperature rises to 55°C, and the speed is set to 65r / min, until the concentration of ferrous chloride remains unchanged, the pressure of the evaporation tank is released, and the internal ferrous chloride is naturally cooled. And a small amount of crystallization appeared;

[0045] Step 3: Set the negative pressure of the evaporation tank to 0.65MPa, and set the temperature to 70°C until the concentration of ferrous chlorid...

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Abstract

The invention discloses a metal product surface sludge ferrous chloride recovery treatment process, which comprises the following steps: collecting metal product surface sludge, carrying out acid pickling, inoculating a mixture of the sludge and a waste acid solution into an evaporation tank, setting the negative pressure of the evaporation tank to be 0.35 MPa, the temperature to be 40-50 DEG C and the rotating speed to be 40-45 r / min, and raising the negative pressure of the evaporation tank to be 0.5 MPa, the temperature to be 55-60 DEG C and the rotating speed to be 55-65 r / min, carrying out pressure relief on the evaporation tank, naturally cooling internal ferrous chloride, forming a small amount of crystals, setting the negative pressure of the evaporation tank to be 0.65 MPa and thetemperature to be 70-75 DEG C, forming a large amount of crystals, carrying out solid-liquid separation, screening a mixture of ferrous chloride crystals and sludge, washing with water in the screening process to obtain ferrous chloride crystals, and drying. According to the invention, the preparation process is simple, the purity of the treated ferrous chloride dry crystals is high, the separated sludge is pollution-free, and subsequent treatment can be directly carried out.

Description

technical field [0001] The invention relates to the technical field of sludge ferrous chloride recovery and treatment, in particular to a process for recovery and treatment of sludge ferrous chloride on the surface of metal products. Background technique [0002] The purity of ferrous chloride obtained from traditional metal product surface sludge ferrous chloride recovery treatment is low, and the sludge cannot be directly used, and subsequent treatment processes are required to realize reuse. Therefore, an improved technology is urgently needed to solve the problem of existing technologies. This problem exists in . Contents of the invention [0003] The object of the present invention is to provide a kind of metal products surface sludge ferrous chloride recovery treatment process, the dry crystal purity of ferrous chloride after the treatment is high, the separated sludge is pollution-free, and can directly carry out follow-up treatment, to solve the above-mentioned Qu...

Claims

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Application Information

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IPC IPC(8): C01G49/10C02F1/04C02F11/13C02F101/12C02F103/16
CPCC01G49/10C02F1/04C02F11/13C02F2101/12C02F2103/16
Inventor 施荣标
Owner 江苏荣信环保科技有限公司
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