Production method of spherical iron-carbon micro-electrolytic filler

Abstract

The invention discloses a production method of spherical iron-carbon micro-electrolysis filler. With 75-80wt% of powered iron, 12-15wt% of pulverized coal, 1-2wt% of bentonite, 5-8wt% of borax and 0.1-1wt% of metal catalyst as raw materials, the method comprises the following steps: mixing the powered iron and pulverized coal with the bentonite, borax and metal catalyst and stirring into a mixture; feeding the mixture into a pelletizing machine and spraying in water accounting for 9-10% of the mixture by weight; pelletizing a spherical green body, drying and putting into a high temperature resistant steel bowl; putting the steel bowl into a kiln; heating to 1,000-1,080 DEG C and preserving heat for 2-4 hours; and cooling and discharging. In the invention, the spherical iron-carbon micro-electrolysis filler has a honeycomb-shaped hole structure inside, and the hardening and passivation of the filler can be effectively prevented; wastewater can be quickly absorbed through capillary pores inside, thereby improving the reaction efficiency; and micro-current is formed by use of the iron-carbon potential difference generated by micro-electrolysis to stimulate the generation of nascent hydrogen and oxygen in wastewater, so that strong redox reaction of the wastewater occurs, the hardly-degradable matters are converted into easily-degradable matters, and thus the aim of sewage treatment is achieved.

Description

technical field [0001] The invention relates to sewage treatment materials, in particular to a production method for iron-carbon micro-electrolytic fillers for sewage treatment. Background technique [0002] The wastewater produced by industries such as metallurgical coking, electroplating, power generation, papermaking, medicine and printing and dyeing is a typical industrial wastewater that is difficult to treat. It has the characteristics of complex components, a large amount of refractory substances, poor biodegradability and high toxicity. At present, most coking plants in China generally use the ordinary activated sludge method to treat the coking wastewater that has been pretreated by distilling ammonia and removing phenols. The removal rate is not high, and the existence of refractory substances makes the effluent water quality not meet the national discharge standards, and further advanced treatment is required. [0003] Iron-carbon micro-electrolysis technology is...

AI Technical Summary

Problems solved by technology

However, because the iron particles in the iron-carbon bed are not uniformly dispersed, the iron particles are prone to rust and harden, which makes it easy to cause hardening during use, which will not only cause the interruption of the micro-electrolysis process and affect the treatment effect, but also frequent The replacement of micro-electrolysis materials requires a large workload and high cost, which reduces the efficiency of wastewater treatment

At present, people mix and press crushed iron filings with activated carbon and binders or elongate into long-grained drying and then roast to make oblate micro-electrolytic fillers. The problem of hardening, but this kind of oblate micro-electrolytic filler is that the surface and the inside are relatively tight after pressing and sintering, and refractory substances gather on the surface, and passivation will be formed on the surface of the filler as time goes by, and a protective film layer is easily formed on the surface And it is not easy to peel off, which will prevent the electrolytic reaction from proceeding, and is not conducive to backwashing. Second, most of them use scrap iron scraps with limited sources and high prices, thereby increasing the production cost of raw micro-electrolytic fillers.