CN1776111A

CN1776111A - Method for preparing high-active multiple composite lake bed mud curing agent

Info

Publication number: CN1776111A
Application number: CN 200510019895
Authority: CN
Inventors: 夏世斌; 汤文斐; 陈小珍; 张召基
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2005-11-28
Filing date: 2005-11-28
Publication date: 2006-05-24
Anticipated expiration: 2025-11-28
Also published as: CN100386482C

Abstract

This invention relates to a method for preparing high activity multielement curing agent for bottom mud of lake. It contains 1, wet grinding waste iron ore slag, sieving, magnetic selecting rest mine powder, 2, the ratio of mine powder and 6-9 % concentration of hydrochloric acid is 1 : 4-6 then magnetic selecting mine powder added with water in 30-50 time of mine powder agitating for 2-3 hr at 60-80 degree centigrade, 3, filtered by filtering machine. 4, added with 2-5 % concentration of H2O2 for oxidating for 0.5-1 hr to become Fe2+ to Fe3+, the volume of H2O2 is 0.5-1 time of filter liquid, 5, added with Na2Co3, saturated solution of NaHCo3 or NH3HCo3 in oxidated solution until the PH value being 9-11, then preparing said curing agent with fine curing effect.

Description

A kind of preparation method of high-active multiple composite lake bed mud curing agent

Technical field

The present invention relates to a kind of preparation method of soil-solidified-agent, particularly relate to a kind of preparation method of lake bed mud curing agent.

Background technology

Known lake bed mud curing agent has: 1). sand, clay mineral class; 2) .CaO; 3). oxides such as activated alumina, manganese oxide, cerium oxide; 4). molysite etc.Purpose is to place one or more layers overburden on polluted bed mud, and polluted bed mud and water body are isolated, and prevents that pollutants in sediments from moving to water body.Can play following three functions: 1). marine sediments and benthon physical property ground are separated; 2). the fixed-contamination deposit prevents that it from suspending or move; 3). reduce the diffusion flux of pollutant in water.Experiment shows, covers PCBs, the PAH that can effectively prevent in the bed mud and heavy metal and enters and cause secondary pollution, and water quality is improved significantly.But actual result shows these curing compound technology and can temporarily control the release of nutritive salt in the bed mud in a short time, but can not keep permanent, and can show certain " compensating effect " subsequently.Main cause is that the curing compound composition is single, and activity is not high, and price is more expensive.

The comprehensive utilization of known iron ore waste residue mainly contains the following aspects: (1) reclaims valuable element from the iron ore waste residue; (2) utilize the filler of iron ore waste residue as the goaf; (3) as soil conditioner and trace-element fertilizer; (4) the iron ore waste residue is as constructional materials; (5) utilize the iron ore waste residue storehouse vegetation of reclaiming.The subject matter that the iron ore waste residue utilization exists is: 1). utilize in the building materials of iron ore waste residue making, the consumption of iron ore waste residue is little, utilization rate is not high, causes the utilization of iron ore waste residue can't reduce the cost of product, causes iron ore waste residue building material product to be difficult to come into the market.2). make a low multiple use, at present, the utilization rate of China's slag has only about 7%.3). the general class of building material product that slag is made is lower, and product category is less; High value added product is few, lacks the market competitiveness; At present, China's slag is in industrial application, and great majority rest on the more low-grade building material product of production, or even directly sells as the substitute of sandstone, and some high-grade building material products, the real industrialization of still being unrealized for various reasons.4). from the iron ore slag, extract, separate, reclaim valuable element respectively, but cost is very high.

Summary of the invention

The object of the present invention is to provide a kind of preparation method of high-active multiple composite lake bed mud curing agent, this preparation method is simple, the low energy consumption high-efficiency rate, and the solidification effect of the product that this preparation method obtains is good.

To achieve these goals, technical scheme of the present invention is: a kind of preparation method of high-active multiple composite lake bed mud curing agent, it is characterized in that it comprises the steps: 1). with the wet-milling of iron ore waste residue, when particle diameter reaches 150～200 orders, screening, through the magnetic separator magnetic separation, the separating ferrum fine ore, the breeze of magnetic separation remainder is standby; 2). by breeze: weight concentration is that the mass ratio of 6～9% hydrochloric acid is 1: (4～6) choose breeze, hydrochloric acid, breeze and hydrochloric acid are added in the reaction vessel, thin up again, the adding quality of water is 30～50 times of powdered ore quality, stirred 60～80 ℃ of temperature 2～3 hours; 3). filter with the vacuum filtration machine then; 4). adding weight concentration in filtrate is 2～5%H ₂O ₂Oxidation of Fe ²⁺Become Fe ³⁺, oxidation 0.5～1 hour, H ₂O ₂The adding quality be 0.5～1 times of filtrate quality; 5). the solution after oxidation adds Na then ₂CO ₃Or NaHCO ₃Or NH ₃HCO ₃Deng the saturated solution of alkali, be 9～11 up to regulator solution pH value, then be prepared into Mg (OH) ₂It is the high-active multiple composite lake bed mud curing agent of main hydration AL, Ca, Fe, Ti, multiple elements such as K, Mn.

The iron ore waste residue is meant the temporary transient unavailable solid or the powdered scrap of metal mining industry department discharging after the exploitation sorting ore, comprises mill tailings and ore dressing plant slag.Wherein mill tailings comprises association tail rock of having exploited out and the iron ore of low ore grade of rejecting midway; The ore dressing plant slag comprises the certain technology of employing, the mineral waste of discharging after the mechanical washing iron ore, and fineness is thinner.Iron ore waste residue complicated component, wherein except that metal component such as iron, magnesium, its essential mineral composition is a gangue mineral, mineral such as silicate, aluminosilicate, carbonatite, calcium magnesium carbonatite such as the clay that forms as quartz, feldspar, pyroxene, garnet, hornblende, calcite, dolomite and alteration thereof, mica, chemical composition is mainly oxides such as silicon, aluminium, calcium, magnesium oxide and small amount of potassium, sodium, calcium, iron, titanium.

The present invention at first uses method commonly used in the ore dressing industry to come the iron ore waste residue is handled, and these methods comprise: fragmentation, ore grinding, screening, magnetic sorting to sample, sub-elect fine iron breeze, and the breeze of magnetic separation remainder is standby.Utilize the insoluble silica that makes of silicon from the acid solution of breeze, to separate; That utilizes that the alkalization technology obtains contains Mg (OH) ₂Be that main emulsion is high-active multiple composite lake bed mud curing agent.This preparation method mainly uses equipment such as common ore mill, magnetic separator and mixer, and flow process is succinct, so the preparation method is simple, the low energy consumption high-efficiency rate; The product that this preparation method obtains is owing to the active component content height, and when therefore being used for bottom mud in lake curing, solidification effect is good.

The present invention had both eliminated the iron ore waste residue to environment damage, can widen the application of scrap iron slag aspect the utilization of resources again.The product that this preparation method obtains also can be used as fume desulfurizing agent, sludge dehydrating agent etc., uses in the environmental protection field.

Description of drawings

Fig. 1 is a process chart of the present invention.

The specific embodiment

Example 1:

As shown in Figure 1, a kind of preparation method of high-active multiple composite lake bed mud curing agent, it comprises the steps: 1). with the wet-milling of iron ore waste residue, when particle diameter reached the 150-200 order, screening was through the magnetic separator magnetic separation, isolate the fine iron breeze of iron content 58-60%, the breeze of magnetic separation remainder is standby; 2). by breeze: weight concentration is that the mass ratio of 6-9% hydrochloric acid is to choose breeze, hydrochloric acid at 1: 4, breeze and hydrochloric acid are added in the reaction vessel, thin up again, the adding quality of water is 30 times of powdered ore quality, rotating speed with 60 rev/mins on the electromagnetic agitation machine stirred 60～80 ℃ of temperature 2 hours; 3). filter with the vacuum filtration machine then; 4). adding weight concentration in filtrate is 2-5%H ₂O ₂Oxidation of Fe ²⁺Become Fe ³⁺, oxidation 0.5 hour, H ₂O ₂The adding quality be 0.5 times of filtrate quality; 5). the solution after oxidation adds Na then ₂CO ₃Saturated solution, be 9-11 up to regulator solution pH value, then be prepared into Mg (OH) ₂It is the high-active multiple composite lake bed mud curing agent (for emulsion) of main hydration AL, Ca, Fe, Ti, multiple elements such as K, Mn.

Example 2:

A kind of preparation method of high-active multiple composite lake bed mud curing agent, it comprises the steps: 1). with the wet-milling of iron ore waste residue, when particle diameter reaches the 150-200 order, screening, through the magnetic separator magnetic separation, isolate the fine iron breeze of iron content 58-60%, the breeze of magnetic separation remainder is standby; 2). by breeze: weight concentration is that the mass ratio of 6-9% hydrochloric acid is to choose breeze, hydrochloric acid at 1: 5, breeze and hydrochloric acid are added in the reaction vessel, thin up again, the adding quality of water is 40 times of powdered ore quality, rotating speed with 60 rev/mins on the electromagnetic agitation machine stirred 60～80 ℃ of temperature 2 hours; 3). filter with the vacuum filtration machine then; 4). adding weight concentration in filtrate is 2-5%H ₂O ₂Oxidation of Fe ²⁺Become Fe ³⁺, oxidation 0.5 hour, H ₂O ₂The adding quality be 0.5 times of filtrate quality; 5). the solution after oxidation adds NaHCO then ₃Saturated solution, be 9-11 up to regulator solution pH value, then be prepared into Mg (OH) ₂It is the high-active multiple composite lake bed mud curing agent (for emulsion) of main hydration AL, Ca, Fe, Ti, multiple elements such as K, Mn.

Example 3:

A kind of preparation method of high-active multiple composite lake bed mud curing agent, it comprises the steps: 1). with the wet-milling of iron ore waste residue, when particle diameter reaches the 150-200 order, screening, through the magnetic separator magnetic separation, isolate the fine iron breeze of iron content 58-60%, the breeze of magnetic separation remainder is standby; 2). by breeze: weight concentration is that the mass ratio of 6-9% hydrochloric acid is to choose breeze, hydrochloric acid at 1: 6, breeze and hydrochloric acid are added in the reaction vessel, thin up again, the adding quality of water is 50 times of powdered ore quality, rotating speed with 60 rev/mins on the electromagnetic agitation machine stirred 60～80 ℃ of temperature 3 hours; 3). filter with the vacuum filtration machine then; 4). adding weight concentration in filtrate is 2-5%H ₂O ₂Oxidation of Fe ²⁺Become Fe ³⁺, oxidation 1 hour, H ₂O ₂The adding quality be 1 times of filtrate quality; 5). the solution after oxidation adds NH then ₃HCO ₃Saturated solution, be 9-11 up to regulator solution pH value, then be prepared into Mg (OH) ₂It is the high-active multiple composite lake bed mud curing agent (for emulsion) of main hydration AL, Ca, Fe, Ti, multiple elements such as K, Mn.

Applicating example:

To the bed mud of an eutrophic lake adopt known CaO curing technology respectively and utilize the present invention prepared with Mg (OH) ₂The high-active multiple composite lake bed mud curing agent that is main hydration AL, Ca, Fe, Ti, multiple elements such as K, Mn has carried out preliminary effect analysis and comparison.

Known CaO curing technology: use amount is a bed mud: when the CaO curing compound is 100: 3 (volume ratio), find that bed mud P burst size is 4mg/ (m ²D), the medicine consumption of processing unit mud amount is 0.25 yuan/m ³

The high-active multiple composite lake bed mud curing agent that the present invention is prepared: use amount is a bed mud: when high-active multiple composite lake bed mud curing agent is 100: 3 (volume ratio), find that bed mud P burst size is 1mg/ (m ²D), the medicine consumption of processing unit mud amount is 0.24 yuan/m ³Use amount bed mud: when high-active multiple composite lake bed mud curing agent is 100: 5 (volume ratio), find that bed mud P burst size is 0.9mg/ (m ²D), the medicine consumption of processing unit mud amount is 0.28 yuan/m ³Use amount bed mud: when high-active multiple composite lake bed mud curing agent is 100: 8 (volume ratio), find that bed mud P burst size is 0.8mg/ (m ²D), the medicine consumption of processing unit mud amount is 0.34 yuan/m ³

Relatively draw: utilize the present invention prepared with Mg (OH) ₂It is suitable with conventional curing compound to be that the high-active multiple composite lake bed mud curing agent of main hydration AL, Ca, Fe, Ti, multiple elements such as K, Mn is handled the medicine consumption of unit mud amount, but bed mud P burst size is than conventional curing compound low 75%.

Utilize the prepared high-active multiple composite lake bed mud curing agent of the present invention to carry out bottom mud in lake curing and all have similar comparativity to known other curing compound.

Claims

1. the preparation method of a high-active multiple composite lake bed mud curing agent is characterized in that it comprises the steps: 1). with the wet-milling of iron ore waste residue, when particle diameter reaches 150～200 orders, screening, through the magnetic separator magnetic separation, the separating ferrum fine ore, the breeze of magnetic separation remainder is standby; 2). by breeze: weight concentration is that the mass ratio of 6-9% hydrochloric acid is 1: 4～6 to choose breeze after the magnetic separation, hydrochloric acid, breeze and hydrochloric acid are added in the reaction vessel, thin up again, the adding quality of water is 30～50 times of powdered ore quality, stirred 60～80 ℃ of temperature 2～3 hours; 3). filter with filter then; 4). adding weight concentration in filtrate is 2～5%H ₂O ₂Oxidation of Fe ²⁺Become Fe ³⁺, oxidation 0.5～1 hour, H ₂O ₂The adding quality be 0.5～1 times of filtrate quality; 5). the solution after oxidation adds Na then ₂CO ₃Or NaHCO ₃Or NH ₃HCO ₃Saturated solution, be 9～11 up to regulator solution pH value, then be prepared into high-active multiple composite lake bed mud curing agent.