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Micro-electrolytic environment-friendly filler, and production raw materials and preparation method thereof

A micro-electrolysis and environmental protection technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as surface loss, easy passivation, and difficulty in popularization and use. The effects of solving system compaction and blockage, improving electrochemical activity, and facilitating popularization and utilization

Inactive Publication Date: 2010-12-01
喻宇琳 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Micro-electrolysis treatment has definite purification efficiency, but the main problem existing in micro-electrolysis fillers at present is that iron filings (or reduced iron particles) fillers are expensive and difficult to popularize and use in sewage treatment; at the same time, iron filings (or reduced iron particles) fillers are Passivation (continuous and dense oxide film is formed on the surface of iron particles), hardening and clogging are prone to occur during use, which reduces the effect of micro-electrolysis and even cannot continue to operate
The main reason is that the iron filings (or reduced iron particles) have a high purity filler, and generally the iron content is higher than 98%, and the content of carbon (cathode electrode) in the iron particles is small, and the surface of the iron particles is prone to dense formation during the corrosion process. Oxide film prevents the electrolysis process from continuing to proceed efficiently, resulting in passivation and reducing the efficiency of micro-electrolysis
In order to improve the electrochemical reaction activity, when adding activated carbon (or coke) particles to increase the cathode, because the density of the external filler such as activated carbon (or coke) is lower than that of iron particles, it cannot be filled evenly in the actual use process, and local bluntness will still occur. Because backwashing will aggravate the inhomogeneity of iron-carbon, accelerate the occurrence of passivation, hardening and clogging, and finally make the system unable to operate continuously
[0012] In order to continuously discharge the iron filler, maintain the continuous high activity of the filler, and prevent the iron from being hardened and blocked during use, Chinese patent: Application No. 93100832 discloses a method of adding a loosening agent to the iron particles, but due to loosening The specific gravity of the agent is relatively light, and it is easy to float out of the water and be lost during use, blocking the water outlet pipe. It is very complicated to operate and the anti-hardening effect is unstable.
Chinese patents: application numbers 95110508, 98242534, 02220441.5 and other patents improve the shape and size of the iron filler to increase the specific surface area of ​​the filler and increase the reaction range of the iron surface, thereby improving the treatment efficiency, but because the anode cannot be fundamentally solved The problem of passivation and the rapid reduction of cathode discharge point, no matter how large the surface area will be gradually covered by the oxide film due to the progress of the reaction, passivation, compaction and blockage will occur sooner or later

Method used

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  • Micro-electrolytic environment-friendly filler, and production raw materials and preparation method thereof
  • Micro-electrolytic environment-friendly filler, and production raw materials and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 As shown in the flow chart, take a certain copper slag in Inner Mongolia, in which the iron oxide content is 64.3wt%, and the copper content is 1.8wt%. After drying, it is pulverized and ground, and passed through a 100-mesh sieve. The bituminous coal is ground and passed through a 100-mesh sieve. Sodium tetraborate is pulverized and ground and passed through a 100-mesh sieve for later use.

[0028] After the sieved copper slag, coal powder and sodium tetraborate are dried, they are fully mixed according to the mass ratio of 85:14:1 to obtain the carbon-matching copper slag powder. Spray a small amount of water to make the mixed powder have a certain viscosity, and then shape it to obtain carbon-copper slag balls. Put the carbon-copper slag balls into the reduction kiln, raise the temperature to 1150°C for 9 hours, keep the temperature for 9 hours, cool down for 6 hours, and then leave the kiln, after being crushed and sieved, the product-micro-electr...

Embodiment 2

[0030] Such as figure 1 As shown in the flow chart, take a certain copper slag in India, wherein the iron oxide content is 71.4wt%, and the copper content is 1.2wt%. After drying, it is pulverized and ground, and passed through a 100-mesh sieve. The coke powder is ground and passed through a 100-mesh sieve. Sodium tetraborate is pulverized and ground and passed through a 100-mesh sieve for later use.

[0031] After the sieved copper slag, coal powder and sodium tetraborate are dried, they are fully mixed according to the mass ratio of 60:35:5 to obtain the carbon-matched copper slag powder. Spray a small amount of water to make the mixed powder have a certain viscosity, and then shape it to obtain carbon-copper slag balls. Put the carbon-copper slag balls into the reduction furnace kiln, heat up for 6 hours to 1150 ° C for 9 hours, cool down for 6 hours, and then leave the kiln, and then sieve after crushing to obtain the product—micro-electrolytic environmental protection f...

Embodiment 3

[0033] Such as figure 1 As shown in the flow chart, take the tailings slag of a copper mine in Sichuan, wherein the iron oxide content is 58.7wt%, and the copper content is 7.4wt%. After drying, it is pulverized and ground, and passed through a 100-mesh sieve. The bituminous coal is ground and passed through a 100-mesh sieve. Sodium tetraborate is pulverized and ground and passed through a 100-mesh sieve for later use.

[0034]After drying the sieved copper slag, coal powder and sodium tetraborate, they are fully mixed according to the mass ratio of 80:19:1 to obtain carbon-matching copper slag powder. Spray a small amount of water to make the mixed powder have a certain viscosity, and then shape it to obtain carbon-copper slag balls. Put the carbon-copper slag balls into the reduction furnace kiln, heat up for 6 hours to 1150 ° C for 9 hours, cool down for 6 hours, and then leave the kiln, and then sieve after crushing to obtain the product—micro-electrolytic environmental ...

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Abstract

The invention discloses a micro-electrolytic environment-friendly filler which simultaneously comprises iron element, copper element and carbon element, has high-efficiency cleaning function and does not cause passivation, hardening and blockage, and production raw materials and a preparation method thereof. The filler is an iron and copper-containing and carbon-doped composite solid granular material; and the filler comprises the following components in percentage by mass: 55 to 88.5 percent of reduced iron, 1 to 10 percent of total copper, 0.5 to 5 percent of carbon and the balance of impurities. The production raw materials include copper slag and carbon in the mass ratio of (60-85) to (14-35). The iron, the copper and the carbon simultaneously exist in the filler grains, wherein the iron is used as an anode to release electrons; the copper and the carbon are used as a cathode discharging point; the total discharge area of the cathode is 20 to 40 percent larger than the total surface area of the filler; and thus the electrochemical activity of the filler in sewage is improved, an oxide film is prevented from being continuously formed on the surface of the filler grains, and the problem of passivation of the filler is completely solved. Only one filler exists in a micro-electrolysis system, so the problems of hardening and blockage of the system can be completely solved by repeated washing and periodic bed loosening.

Description

Technical field: [0001] The present invention relates to an iron-carbon composite filler used in a new sewage treatment micro-electrolysis process and its production raw material and preparation method, in particular to a micro-electrolysis environmental protection filler containing iron, copper and carbon elements and its production raw material and preparation method . Background technique: [0002] In the micro-electrolysis process in sewage treatment, iron filings (or reduced iron particles) are often used as fillers, and the oxidation-reduction (electrochemical corrosion) effect of iron in water is used to remove pollutants in sewage and purify water quality. The basic principle is that iron particles form countless tiny primary batteries in sewage, in which iron loses electrons as the anode, and activated carbon is added as the cathode in order to improve the discharge efficiency. The electrode process of iron-carbon electrocorrosion is as follows: [0003] Anode rea...

Claims

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Application Information

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IPC IPC(8): C02F1/461
Inventor 喻宇琳喻小琦
Owner 喻宇琳
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