CN1337356A

CN1337356A - Production process of aluminium iron sulfate polymer as composite water purifying agent

Info

Publication number: CN1337356A
Application number: CN 01133248
Authority: CN
Inventors: 邓中杰; 茹江林; 李玉香
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-09-15
Filing date: 2001-09-15
Publication date: 2002-02-27
Anticipated expiration: 2021-09-15
Also published as: CN1160253C

Abstract

The production process of compound water-cleaning agent aluminium iron polysulfate uses the iron oxide contained offscum produced after production of sulfuric acid in sulfuric acid plant as raw material, and adopting the folloiwng steps: according to the chemometric, adding water, offscum and sulfuric acid into reactor in turn to make reaction, then adding isometric water to make dilution, and discharging diluted reactant into settling tank, adding small quantity of flocculant to make natural settling and solid-liquid separation, pumping said clear liquor into polymerization container, adding H2O2 and making it and the clear liquor to implement quick oxidation and polymerization to obtain the invention finished product liquor, evaporating and dewatering to obtain its natural crystal, then breaking it into granular or powdered material to obtain the invented solid aluminium iron polysulfate. It can obtain good sewage treatment effect.

Description

The production technique of aluminium iron sulfate polymer as composite water purifying agent

(1) technical field

The invention belongs to the production technique of water purification agent, be specifically related to the production technique that a kind of waste residue that utilizes vitriol works to contain ferric oxide is produced aluminium iron sulfate polymer as composite water purifying agent.

(2) background technology

Aluminium, iron polymer inorganic polymer water purification agent are the new chemical industry of getting up from the seventies to the nineties research and development, for improving people's quality of life and administering environment and played great role.The water purification agent kind is a lot, and production technique has nothing in common with each other.The waste residue of vitriol works arbitrarily discharges at present, causes environmental pollution, is badly in need of administering.Chinese patent CN1219507A discloses a kind of " one-step production technique for ferric polysulfate solid water purifier ", utilizes Steel Plant and vitriol works to contain ferric oxide waste residue and oxidant reaction, produces the ferrous solid water purification agent bodied ferric sulfate.This patent application only is in the laboratory test stage, the sulfuric acid gradation will be added among the embodiment to contain in the beaker of ferric oxide waste residue, and temperature of reaction need be controlled at 40～70 ℃, this is difficult for grasping in actual production, in addition, production process is oxidizer not, and ferrous iron can not change into ferric iron, do not reach polymerization effect, and material is impure in the scum, and solid, liquid does not separate, and water-insoluble is too high, influence purifying water effect, do not possess suitability for industrialized production.

(3) summary of the invention

Technical problem to be solved by this invention is to utilize vitriol works to contain ferric oxide waste residue suitability for industrialized production aluminium iron sulfate polymer as composite water purifying agent, water purification quality height, effective is used to handle domestic water, trade effluent, municipal effluent, reaches the treatment of wastes with processes of wastes against one another, reduce control expense, reduce environmental pollution.

Technical solution of the present invention is: the waste residue that employing vitriol works produces behind the sulfuric acid is a raw material, Fe in the waste residue ₂O ₃Content 40～70%, Al ₂O ₃Content 15～20%, by stoichiometry, leaching yield 60%～80%, complex acid concentration 45%～50%, sulfuric acid concentration is 92.5%～98%.

Its production technique is as follows: according to stoichiometry, earlier water is added in the reactor, slag is poured into again, add sulfuric acid then, airtight natural reaction two hours; The water that adds above-mentioned isodose in the reactant dilutes, and the reactant after will diluting then enters subsider, adds a spot of flocculation agent natural subsidence, precipitates 2～4 hours, solid-liquid separation, and the clear liquid pH value is controlled at about 2; Above-mentioned clear liquid is squeezed into aggregation container, according to Fe ²⁺Content adds H ₂O ₂, H ₂O ₂Enter clear liquid by the container bottom sprinkling,, make Fe with the quick oxypolymerization of clear liquid ²⁺Content≤0.2 promptly gets the PAFS finished fluid.

Material behind the extraction finished fluid is washed, and the secondary wash water can add in the reactor and sulfuric acid reaction, and one time wash water can be used for the diluting reaction thing, and washing lotion is multiplexing, slag discharging slag field.

Above-mentioned PAFS finished fluid is through dehydration by evaporation, and degree Beaume is controlled at 58～60 °, and spontaneous nucleation after the discharging is broken into granular or powdery then, promptly gets solid polymeric aluminum ferric sulfate.

The present invention is a raw material with the waste residue, and production cost is low, and technology is simple, is convenient to operation, normal temperature and pressure, and energy saving does not produce secondary pollution, the production efficiency height; Aluminium, iron are compound, and the effect of disposing of sewage is better than the simple substance product.

(4) specific embodiment

The waste residue that employing sulfuric acid plant produces behind the sulfuric acid is raw material, Fe in the waste residue₂O ₃Content 50%, Al₂O ₃Contain Amount 15%, leaching rate by 60%, complex acid concentration calculates by 45%, sulfuric acid concentration is 92.5%.

According to stoichiometry, the water with 990kg adds in the reactor earlier, again the 1000kg slag is poured into, Add then 810kg sulfuric acid, natural reaction two hours; The water that adds again isodose dilutes, then Reactant is entered subsider, add 10g flocculant polyacrylamide natural subsidence, precipitation 2～4 is little The time, Separation of Solid and Liquid, the clear liquid pH value is controlled at about 2; Above-mentioned clear liquid is squeezed into aggregation container, according to Fe²⁺Cubage adds the H of about 25～30kg₂O ₂，H ₂O ₂Enter clear liquid by the container bottom sprinkling, with the polymerization of clear liquid Quick Oxidation, make Fe²⁺Content≤0.2 namely gets PAFS finished fluid 1500～1600 Kg.

The aluminium iron sulfate polymer as composite water purifying agent that adopts the present invention to produce, outward appearance is the transparent liquid of bronzing thickness Body or bronzing solid. The fluid product quality index is as follows:

Density: (20 ℃) g/cm³〉=1.43; Iron (Fe³⁺) % 〉=5.5; Aluminium (Al₂O ₃) % 〉=5, reducing substances (Fe²⁺) %≤0.2, basicity %=7～9.

These polymerization plasmas among the present invention can be brought into play rapidly charging neutrality and flocculation bridge formation from high starting point Effect, it is fast to have floccule body formation speed in water treatment procedure, and Floc density is big, and sinking speed is fast etc. Characteristics have good to the COD in the various sewage, BOD, suspension, colourity, microorganism etc. Removal effect.

Claims

1, a kind of production technique of aluminium iron sulfate polymer as composite water purifying agent, the waste residue that employing vitriol works produces behind the sulfuric acid is a raw material, Fe in the waste residue ₂O ₃Content 40～70%, Al ₂O ₃Content 15～20%, by stoichiometry, leaching yield 60%～80%, complex acid concentration 45%～50%, sulfuric acid concentration is 92.5%～98%;

It is characterized in that production technique is as follows: according to stoichiometry, earlier water is added in the reactor, again slag is poured into, add sulfuric acid then, airtight natural reaction two hours; The water that adds above-mentioned isodose in the reactant dilutes, and the reactant after will diluting then enters subsider, adds a spot of flocculation agent natural subsidence, precipitates 2～4 hours, solid-liquid separation, and the clear liquid pH value is controlled at about 2; Above-mentioned clear liquid is squeezed into aggregation container, according to Fe ²⁺Content adds H ₂O ₂, H ₂O ₂Enter clear liquid by the container bottom sprinkling,, make Fe with the quick oxypolymerization of clear liquid ²⁺Content≤0.2 promptly gets the PAFS finished fluid.

2, the production technique of aluminium iron sulfate polymer as composite water purifying agent according to claim 1 is characterized in that the material behind the extraction finished fluid is washed, and the secondary wash water can add in the reactor and sulfuric acid reaction, and one time wash water can be used for the diluting reaction thing.

3, the production technique of aluminium iron sulfate polymer as composite water purifying agent according to claim 1 is characterized in that the flocculation agent that adopts is a polyacrylamide.

4, the production technique of aluminium iron sulfate polymer as composite water purifying agent according to claim 1 is characterized in that above-mentioned PAFS finished fluid through dehydration by evaporation, and degree Beaume is controlled at 58～60; Spontaneous nucleation after the discharging is broken into granular or powdery then, promptly gets solid polymeric aluminum ferric sulfate.