Microwave technology used in preparing polymeric ferric sulfate from pyrite burned slag pickling liquid

Abstract

The present invention discloses a process capable of utilizing microwave technique to treat sulfurous iron ore roasted slag pickling liquor so as to prepare ferric poly sulfate. Said process utilizes microwave to induce partial reduction and oxidation polymerization proves, and includes the following steps: (a), adding the ferric pickling liquor into a microwave reactor; (b), adding the sulfurous concentrate; (c), controlling temperature at 60-70 deg.C and using microwave to make radiation for 35-45 min, when the reduction rate of said pickling liquor is reached to 40%, stopping microwave radiation; (d), taking out reduction liquor to make filtration, regulating filtrate pH value to 1-2; (e), adding the reduction liquor whose pH value is 1-2 into microwave reactor, adding sodium chlorate, using microwave to make radiation for 30 min under the condition of 35 deg.C so as to obtain ferric polysulfate product whose alkalinity is up to 12%.

Description

technical field [0001] The patent of the present invention is the chemical process method and technical route of using microwave induction technology in partial reduction unit of sulfuric acid slag acid leaching solution and oxidative polymerization of reducing solution to prepare polymeric ferric sulfate unit. Background technique [0002] Polymerized ferric sulfate (PFS) is a polymer of basic ferric sulfate. It is a reddish-brown transparent liquid (or light yellow amorphous solid), referred to as polyferric. It is a new type of high-efficiency inorganic polymer flocculant. Its composition Available general formula [Fe 2 (OH)n(SO 4 ) 3-n / 2 ] represents, n<2 in the formula, m=f(n), there are multiple high valence and polynuclear complex ions in its aqueous solution, such as [Fe 2 (OH) 4 〕 2+ , [Fe(H 2 O) 6 ] 3+ , [Fe 8 (OH) 20 ] 4+ etc. It has a strong ability to neutralize the charge on suspended particles, has a large surface area and strong adsorption capac...

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Problems solved by technology

[0004] In order to solve the problems of long reaction time, high energy consumption, large equipment volume and unstable product quality caused by heat transfer temperature difference in the polymerization process, the present invention proposes a microwave technology for pyrite slag The process of preparing polyferric sulfate from acid leaching solution can shorten the time required for partial reduction to 35-45 minutes by using microwave induction technology, and the base of the polymerized product can be stabilized at 9-12%.

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