CN213357373U

CN213357373U - Production system for preparing dry powder mortar by using heavy metal contaminated soil or lead-zinc tailings

Info

Publication number: CN213357373U
Application number: CN202022160796.0U
Authority: CN
Inventors: 马榆凡; 马朝阳; 杨洋
Original assignee: Chongqing Yiyuan Environmental Protection Engineering Co Ltd
Current assignee: Chongqing Yiyuan Environmental Protection Engineering Co Ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2021-06-04
Anticipated expiration: 2030-09-27

Abstract

The utility model discloses an utilize production system of heavy metal contaminated soil or lead-zinc tailing preparation dry powder mortar, the gangue is worn into the gangue powder through the Raymond mill, the mixer is used for polluting soil or lead-zinc tailing misce bene with gangue powder and heavy metal, the feed opening of mixer links to each other with rotary kiln conveyer feed inlet, lime stone feed bin and silica sand feed bin are located rotary kiln feed inlet top, add lime stone and silica sand to the rotary kiln through the unloading valve control that is located on lime stone feed bin and the silica sand feed bin, the gas outlet pipeline of rotary kiln links to each other with the condenser, gas after the cooling gets into electrostatic precipitator and glass fabric in proper order through the draught fan and receives the dirt bag and collect heavy metal powder. The utility model discloses can finally realize collecting the heavy metal in heavy metal contaminated soil and the lead-zinc tailing, then be used for preparing dry powder mortar with the residue that the calcination obtained, reach changing waste into valuables's effect, alleviate ambient pressure, solve these solid useless difficult problems of handling.

Description

Production system for preparing dry powder mortar by using heavy metal contaminated soil or lead-zinc tailings

Technical Field

The utility model relates to an utilize production system of heavy metal contaminated soil or lead-zinc tailing preparation dry powder mortar belongs to the useless comprehensive utilization field admittedly.

Background

The pileus county is one of the important production areas of the lead-zinc tailings, in the process of mining the lead-zinc ores, the lead-zinc tailings are accumulated to seriously affect the soil and the environment around the mining area, the heavy metals in the mining area are released and migrated under the action of surface biogeochemistry to cause serious heavy metal pollution to the soil and rivers, and the polluted water enters crops in an irrigation mode and enters human bodies through food chains to seriously threaten the survival, health and living environment of people and livestock near the mining area.

Due to the accumulation of lead-zinc tailings and other reasons, the soil is polluted by corresponding heavy metals. The heavy metal soil is the soil polluted by lead, zinc, copper, nickel, tin, arsenic, cadmium, fluorine and the like which exceed the soil pollution standard. The substances are not processed and applied in time, and more serious environmental pollution can be caused. Therefore, how to treat a large amount of accumulated lead-zinc tailings and heavy metal contaminated soil becomes a problem which needs to be solved urgently in local places.

SUMMERY OF THE UTILITY MODEL

To the technical problem, an object of the utility model is to provide an utilize heavy metal contaminated soil or lead-zinc tailing preparation dry powder mortar's production system, solve lead-zinc tailing and heavy metal contaminated soil and handle difficult problem, retrieve the heavy metal.

In order to realize the purpose, the technical scheme of the utility model is that: a production system for preparing dry powder mortar by utilizing heavy metal contaminated soil or lead-zinc tailings is characterized in that: the dry-type dust collector comprises a drying furnace, a Raymond mill, a rotary kiln, a condenser, an induced draft fan, an electrostatic precipitator, a glass fiber dust collection bag, a limestone bin and a silica sand bin, gangue is ground into gangue powder through the Raymond mill, a discharge port of the Raymond mill is connected with a gangue powder temporary storage bin through a conveying belt, heavy metal polluted soil or lead-zinc tailings are conveyed to a stirrer through the conveying belt after being dried through the drying furnace, the gangue powder temporary storage bin is positioned above the stirrer, discharging is controlled through a discharging valve positioned on a discharging port of the gangue powder temporary storage bin, the stirrer is used for uniformly mixing the gangue powder and the heavy metal polluted soil or the lead-zinc tailings, a discharging port of the stirrer is connected with a feed port of the rotary kiln, the limestone bin and the silica sand bin are positioned above the feed port of the rotary kiln, limestone and silica sand are added into the rotary kiln through the discharging valve positioned on the limestone bin and the silica sand, the gas outlet pipeline of the rotary kiln is connected with a condenser, the condenser cools the gas of the rotary kiln by condensed water, and the cooled gas sequentially enters the electrostatic dust collector and the glass fiber cloth dust collection bag through the induced draft fan to collect heavy metal powder.

The dry powder mortar plays roles of bonding, lining, protection and decoration in a thin layer in the construction industry, and has extremely wide application in construction and decoration engineering.

The tailings or the soil polluted by heavy metal and the coal gangue are mixed and put into a rotary kiln to be baked to about 1400 ℃, and the soil epidermis is vitrified. By utilizing the principle that heavy metal can be gasified at high temperature, the heavy metal comes out of the rotary kiln in a gas form, and the gas formed by the heavy metal enters a condenser for condensation and is cooled to about 60 ℃. An induced draft fan is used for introducing an electrostatic dust collector and a glass fiber cloth dust collection bag to collect heavy metal powder, and then the flue gas is subjected to other treatments and then is discharged. The collection rate of heavy metals can reach 80-90%. And adding limestone and silica sand into the waste residue after the heavy metals are recovered according to the properties of the dry-mixed mortar, and continuously calcining at about 1500 ℃ to produce the dry-mixed mortar. The dry powder mortar required to be formed contains 30-50% of calcium oxide, 20% of silicon and 5% of iron.

In the scheme, the method comprises the following steps: still include the condensate tank, the condensate tank delivery port passes through the condensate pump and links to each other with the cold side import pipeline of condenser, the comdenstion water return line of condenser links to each other with the condensate tank, be provided with cooling blower on the condensate tank. So as to realize the recycling of the condensed water.

In the scheme, the method comprises the following steps: and a mass sensor is arranged on the blanking valve and used for monitoring the blanking amount.

Has the advantages that: the utility model discloses can mix coprocessing with heavy metal contaminated soil or lead-zinc tailing and gangue, the gangue provides the combustion value for it, finally realizes collecting the heavy metal in heavy metal contaminated soil and the lead-zinc tailing, then is used for preparing the dry powder mortar with the residue that the calcination obtained, reaches the effect of changing waste into valuables, alleviates ambient pressure, solves these solid useless difficult problems of handling.

Drawings

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

Detailed Description

The invention will be further described by way of examples with reference to the accompanying drawings:

example 1, as shown in fig. 1, a production system for preparing dry-mixed mortar from heavy metal contaminated soil or lead-zinc tailings is composed of a drying furnace 1, a raymond mill 2, a rotary kiln 3, a condenser 4, an induced draft fan 5, an electrostatic precipitator 6, a glass fiber dust collection bag 7, a limestone silo 8, a silica sand silo 9, a blanking valve and a conveying belt, a stirrer 11, a temporary coal gangue powder storage silo 12, a condensate water tank 13, a cooling fan 14, and a condensate water pump 10.

The coal gangue is ground into coal gangue powder by a Raymond mill 2, a discharge port of the Raymond mill 2 is connected with a coal gangue powder temporary storage bin 12 by a conveying belt (various conveying belts are not shown in the figure, the installation mode is the conventional technology in the field), heavy metal polluted soil or lead-zinc tailings are dried by a drying furnace 1 and then are conveyed to a stirrer 11 by the conveying belt, the coal gangue powder temporary storage bin 12 is positioned above the stirrer 11, the discharging is controlled by a discharging valve (a discharging valve is not shown in the figure) positioned on a discharging port of the coal gangue powder temporary storage bin 11, and a mass sensor is installed on the discharging valve and used for monitoring the discharging amount and controlling the addition of the coal gangue powder into the stirrer 11. The mixer 11 is used for mixing coal gangue powder and heavy metal contaminated soil or lead-zinc tailings uniformly, a feed opening of the mixer 11 is connected with a feed inlet of a rotary kiln conveyor, the limestone silo 8 and the silica sand silo 9 are positioned above a feed inlet of the rotary kiln 3, limestone and silica sand are added into the rotary kiln 3 through control of a discharge valve positioned on the limestone silo 8 and the silica sand silo 9, and a quality sensor is installed on the discharge valve 13 and used for monitoring the discharge amount. The gas outlet pipeline of rotary kiln 3 links to each other with condenser 4, and condenser 4 adopts the comdenstion water to cool off rotary kiln gas, and comdenstion water recycle is specific: the water outlet of the condensate water tank 16 is connected with a cold side inlet pipeline of the condenser 4 through a condensate water pump 10, a condensate water return pipeline of the condenser 4 is connected with a condensate water tank 13, and a cooling fan 14 is arranged on the condensate water tank 13. The gas cooled by the condenser 4 sequentially enters an electrostatic dust collector 6 and a glass fiber cloth dust collection bag 7 through a draught fan 5 to collect heavy metal powder.

The present invention is not limited to the above embodiments, and those skilled in the art can understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A production system for preparing dry powder mortar by utilizing heavy metal contaminated soil or lead-zinc tailings is characterized in that: the dry-type dust collector comprises a drying furnace, a Raymond mill, a rotary kiln, a condenser, an induced draft fan, an electrostatic precipitator, a glass fiber dust collection bag, a limestone bin and a silica sand bin, gangue is ground into gangue powder through the Raymond mill, a discharge port of the Raymond mill is connected with a gangue powder temporary storage bin through a conveying belt, heavy metal polluted soil or lead-zinc tailings are conveyed to a stirrer through the conveying belt after being dried through the drying furnace, the gangue powder temporary storage bin is positioned above the stirrer, discharging is controlled through a discharging valve positioned on a discharging port of the gangue powder temporary storage bin, the stirrer is used for uniformly mixing the gangue powder and the heavy metal polluted soil or the lead-zinc tailings, a discharging port of the stirrer is connected with a feed port of the rotary kiln, the limestone bin and the silica sand bin are positioned above the feed port of the rotary kiln, limestone and silica sand are added into the rotary kiln through the discharging valve positioned on the limestone bin and the silica sand, the gas outlet pipeline of the rotary kiln is connected with a condenser, the condenser cools the gas of the rotary kiln by condensed water, and the cooled gas sequentially enters the electrostatic dust collector and the glass fiber cloth dust collection bag through the induced draft fan to collect heavy metal powder.

2. The production system for preparing dry powder mortar by using heavy metal contaminated soil or lead-zinc tailings according to claim 1, wherein the production system comprises: still include the condensate tank, the condensate tank delivery port passes through the condensate pump and links to each other with the cold side import pipeline of condenser, the comdenstion water return line of condenser links to each other with the condensate tank, be provided with cooling blower on the condensate tank.

3. The production system for preparing dry powder mortar by using heavy metal contaminated soil or lead-zinc tailings according to claim 1, wherein the production system comprises: and a mass sensor is arranged on the blanking valve and used for monitoring the blanking amount.