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Process for producing polymeric aluminum ferric chloride coagulating agent by using pickling waste water containing iron

A technology of polyaluminum ferric chloride and polyaluminum chloride, which is applied in the fields of iron halide, flocculation/sedimentation water/sewage treatment, etc., can solve the problem of complex process, low salinity of polyaluminum iron coagulant, and difficulty in large-scale promotion. Use and other problems, to achieve the effect of simple and easy operation, excellent pharmaceutical performance, and wide application range

Active Publication Date: 2012-03-14
北京万水净水剂有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the products reported in these patents either use iron salt as a single component (200510101065.6, CN99102960.7) or the main component (2007100042744.X) to produce polyferric coagulants, or produce polyaluminium-iron coagulant product salts Basicity is too low (2007100042744.X) or the process of adjusting the basicity is complicated (200610069504.4), which is not easy to be widely used
At present, using pickling waste liquid and aluminum-containing raw materials (bauxite, calcium aluminate powder, aluminum hydroxide, etc.) as raw materials, supplemented by common oxidants (sodium chlorate, chlorine, etc.) Polyaluminum ferric chloride coagulant with salinity has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Weigh aluminum hydroxide powder (Al 2 0 3 >63%) 0.45T, industrial hydrochloric acid (HCl about 20%) 2.0T, pickling waste liquid 0.6T (Fe>120g / L), put into 3000L acid-resistant, pressure-resistant reactor. The reactor was pressurized to 0.24Mpa and kept for 4 hours. After the reaction, place the reaction solution in a settling tank, settle for 4 hours and take the upper clear night to obtain the clear solution of the mother liquor of polyaluminum ferric chloride;

[0017] (2) Put the net liquid of the polyaluminum ferric chloride mother liquor obtained in the previous step back into the reactor, raise the temperature to 50° C., and start stirring. Add 22.0Kg of sodium chlorate in batches in the reactor, and react for 1 hour;

[0018] (3) Raise the temperature in the reactor to 80°C, add 0.10T calcium aluminate powder (Al 2 o 3 >53%), the closed reactor was reacted for 2 hours, after the reaction, the liquid in the kettle was poured into the settling tank, and se...

Embodiment 2

[0020] (1) Weigh bauxite (Al 2 o 3 >35%) 1.0T, industrial hydrochloric acid (HCl about 25%) 3.0T, pickling waste liquid 0.8T (Fe>110g / L), put into 5000L acid-resistant, pressure-resistant reactor. The reactor was pressurized to 0.24Mpa and kept for 4 hours. After the reaction, place the reaction solution in a settling tank, settle for 4 hours and take the upper clear night to obtain the clear solution of the mother liquor of polyaluminum ferric chloride;

[0021] (2) Put the net liquid of the polyaluminum ferric chloride mother liquor obtained in the previous step back into the reactor, raise the temperature to 50° C., and start stirring. Add the sodium chlorate of 26.7Kg in batches in reactor, react 1 hour;

[0022] (3) Raise the temperature in the reactor to 80°C, add 0.160T calcium aluminate powder (Al 2 o 3 >53%), the closed reactor was reacted for 2 hours, after the reaction, the liquid in the kettle was poured into the settling tank, and settled for 1 hour, and the ...

Embodiment 3

[0024] (1) Weigh aluminum hydroxide powder (Al 2 o 3 >63%) 0.55T, industrial hydrochloric acid (HCl is about 22%) 2.3T, put into 3000L acid-resistant, pressure-resistant reactor. The reactor was pressurized to 0.24Mpa and kept for 4 hours. After the reaction, place the reaction solution in a settling tank, settle for 4 hours and take the upper clear night to obtain the clear solution of the mother liquor of polyaluminum ferric chloride;

[0025] (2) Return the net liquid of the polyaluminum ferric chloride mother liquor obtained in the previous step to the reactor, and add liquid ferric chloride (FeCl 3 >40%) 0.28T, start stirring, and slowly raise the temperature in the reactor to 80°C (the heating process is controlled within 15-30min). Add 0.155T calcium aluminate powder (Al 2 o 3 >53%), the closed reactor was reacted for 2 hours, after the reaction, the liquid in the kettle was poured into the settling tank, and settled for 1 hour, and the upper clear night was Al 2 ...

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Abstract

The invention relates to a process for producing a polymeric aluminum ferric chloride coagulating agent by using pickling waste water containing iron, wherein the pickling waste water and the raw material containing aluminum are adopted to produce the product. The preparation method is characterized by: adding the raw material containing the aluminum, industrial hydrochloric acid and the pickling waste water to a reactor according to a certain ratio; carrying out a reaction for 4 hours under pressure of 0.24-0.26 Mpa; evacuating the liquid inside the reactor; after settling for 4 hours, injecting the supernatant back to the reactor; adding an oxidant at a temperature of 50-60 DEG C; after reacting for 1 hour, heating to the temperature of about 80 DEG C; adding an aluminate, and continuously stirring for 2 hours; discharging the resulting liquid into a sedimentation tank, and settling for 1 hour, wherein the resulting supernatant is the polymeric aluminum ferric chloride finished product. The product of the present invention concurrently has the advantages of the iron-based coagulating agent and the aluminum-based coagulating agent, and is a widely applicable high quality coagulating agent for drinking water treatment and sewage treatment. The process of the present invention provides a feasible approach for the comprehensive utilization of the pickling waste water, and provides good economic benefits, social benefits and environmental benefits.

Description

(1) Technical field [0001] The invention relates to a new process for producing a water purifying agent from steel washing waste acid. The main product of the production process is polyaluminum ferric chloride. The water purifying agent is widely used in the fields of drinking water purification and sewage pretreatment, especially It has obvious advantages in the treatment of low turbid drinking water and high COD and high phosphorus sewage. (2) Background technology [0002] In order to improve the surface structure of the steel or process the edge, the steel surface is often cleaned by the corrosive effect of strong acid (such as hydrochloric acid, sulfuric acid). According to incomplete statistics, the annual discharge of pickling waste liquid by my country's iron and steel enterprises is close to one million square meters, and this value shows a trend of increasing year by year. On the one hand, the pickling waste liquid is very corrosive. If it is discharged into the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10C02F1/52
Inventor 王东升陈荣来晏晓敏徐绪筝
Owner 北京万水净水剂有限公司
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