Method for continuously producing ferric salt crystals

A crystal and iron salt technology, which is applied in the field of continuous production of iron salt crystals, can solve the problems of easy crystallization, sticking and blocking the discharge pipe

Pending Publication Date: 2021-10-08
3R ENVIRONMENTAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a continuous production method of iron salt crystals, which fundamentally solves the problem that batch

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for continuously producing iron salt crystals, comprising the steps of:

[0020] S1. Concentrate the ferric chloride solution to a concentration of 58%~64%, transfer to the crystallization kettle, cool to below 37°C, add 1~2kg of seed crystals per ton of concentrated solution, and start the stirring paddle;

[0021] S2. When a small amount of crystals appear, that is, when the crystal content in the solid-liquid mixture is 3% to 8%, open the discharge pump and the circulation pipeline valve;

[0022] S3. When the amount of crystals accounts for 30% to 60% of the total weight, close the circulation pipeline valve, open the discharge valve, and discharge the material to the centrifuge. At the same time, transfer the concentrated ferric chloride solution into the crystallization kettle to make the crystallization kettle The feed flow rate and output flow rate are kept consistent, the volume V of the crystallization tank, the flow rate is 0.8~1.2V / h, and the contin...

Embodiment 2

[0026] A method for continuously producing iron salt crystals, comprising the steps of:

[0027] S1. Concentrate the ferrous chloride solution to a concentration of 34%~50%, transfer to the crystallization kettle, turn on the stirring paddle, and cool to below 25°C;

[0028] S2. When a small amount of crystals appear, that is, when the crystal content in the solid-liquid mixture is 3% to 8%, open the discharge pump and the circulation pipeline valve;

[0029] S3. When the amount of crystals accounts for 30% to 60% of the total weight, close the circulation pipeline valve, open the discharge valve, and discharge the material to the centrifuge. At the same time, transfer the concentrated ferrous chloride solution into the crystallization kettle to make the crystallization kettle The feed flow rate and the discharge flow rate are consistent, the volume V of the crystallization tank is 0.5~1.0V / h, and the continuous production of ferrous chloride tetrahydrate crystals is realized;...

Embodiment 3

[0033] A method for continuously producing iron salt crystals, comprising the steps of:

[0034] S1. Concentrate the ferrous sulfate solution to a concentration of 20%~23%, transfer to the crystallization kettle, turn on the stirring paddle, and cool to below 5°C;

[0035] S2. When a small amount of crystals appear, that is, when the crystal content in the solid-liquid mixture is 3% to 8%, open the discharge pump and the circulation pipeline valve;

[0036] S3. When the amount of crystals accounts for 15% to 25% of the total weight, close the circulation pipeline valve, open the discharge valve, and discharge the material to the centrifuge, and simultaneously transfer the concentrated ferrous sulfate solution into the crystallization kettle to make the crystallization kettle The feed flow rate and the discharge flow rate are kept consistent, the crystallization tank volume V, the flow rate is 0.5~1.0V / h, and the continuous production of ferrous sulfate heptahydrate crystals is...

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PUM

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Abstract

The invention provides a method for continuously producing ferric salt crystals, which comprises the following steps: S1, transferring ferric salt concentrated to the required concentration into a crystallization kettle, starting a stirring paddle, cooling to the required temperature, and adding seed crystals as required; S2, when a small amount of crystals appear, opening a material pump and a circulating pipeline valve; S3, when the amount of the crystals accounts for 10-60% of the total weight, closing a circulating pipeline valve, opening a discharging valve, discharging to a centrifugal machine, and meanwhile, transferring the concentrated ferric salt into a crystallization kettle, so that the feeding flow and the discharging flow of the crystallization kettle are basically kept consistent, and continuous production of the crystals is realized; and S4, concentrating the centrifuged mother liquor, and returning the concentrated mother liquor to the crystallization kettle. According to the invention, the problem that the discharging pipe is easily blocked due to crystallization and bonding in intermittent production is fundamentally solved, and the intermittent production can be converted into continuous production under the condition of not increasing equipment, so that the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of continuous production of crystals, in particular to a continuous production method of iron salt crystals. Background technique [0002] In the industrial production of iron salt crystallization, due to the cohesiveness of the crystals, it is easy to deposit and form large crystals at the bottom of the crystallization kettle, stick to the bottom of the equipment, block the discharge pipe, and cause the crystallized solid-liquid mixture to fail to be released from the crystallization kettle . Only pumps can be used to transfer the solid-liquid mixture to the centrifuge. The transfer process is still difficult, or the solid-liquid mixture can be reheated to melt the blocked part of the bottom pipe and then recrystallize. Industrial production of iron salt crystals is facing great difficulties. [0003] In CN 110451582 A "A Continuous Production Method of Ferric Trichloride", the crystallization time is s...

Claims

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Application Information

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IPC IPC(8): B01D9/02C01G49/10C01G49/14C01G9/06
CPCB01D9/0036B01D9/0063C01G49/10C01G49/14C01G9/06
Inventor 车莹石肖罗莉娟杨合雄
Owner 3R ENVIRONMENTAL TECH CO LTD
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