CN212334612U - Carbide slag comprehensive utilization device - Google Patents
Carbide slag comprehensive utilization device Download PDFInfo
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- CN212334612U CN212334612U CN202021347505.2U CN202021347505U CN212334612U CN 212334612 U CN212334612 U CN 212334612U CN 202021347505 U CN202021347505 U CN 202021347505U CN 212334612 U CN212334612 U CN 212334612U
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Abstract
A device for comprehensively utilizing carbide slag comprises a flotation silicon removal unit, an active lime preparation unit and a micro-powder calcium carbonate preparation unit; the flotation desilicication unit comprises a flotation stirring tank, a flotation machine and a first filter press, the active lime preparation unit comprises a preheater, a roasting furnace, a cooler and a ball pressing and forming system, and the micropowder calcium carbonate preparation unit comprises a strong magnetic separator, a hydrocyclone, a carbonization tank, a thickener, a second filter press and a drying and grinding system. The method comprises the following steps: adjusting the pH value of the carbide slag slurry, desiliconizing and decarbonizing the slurry, and performing filter pressing to prepare a calcium hydroxide filter cake; preheating a calcium hydroxide filter cake, wherein one part of the calcium hydroxide filter cake is used as a desulfurizer, the other part of the calcium hydroxide filter cake is roasted at high temperature to form active lime, and the active lime is pressed into balls to be prepared into active lime particles which are used as raw materials of a calcium carbide preparation system; adding water to dilute the calcium hydroxide filter cake, magnetically separating to remove iron compounds, preparing calcium carbonate slurry in a carbonization tank after impurity removal, thickening, performing pressure filtration to prepare a calcium carbonate filter cake, and drying and grinding to form micropowder calcium carbonate.
Description
Technical Field
The utility model belongs to the technical field of the chemical industry, especially, relate to a carbide slag comprehensive utilization device.
Background
According to statistics, the existing calcium carbide production capacity in China is about 2600 ten thousand tons, the produced calcium carbide slag exceeds 3500 ten thousand tons every year, and the main mineral component in the calcium carbide slag is Ca (OH)2The proportion of the carbide slag in the carbide slag reaches 70 to 85 percent. At present, only a small part of the carbide slag is used for manufacturing cement with low added value, most of the rest carbide slag is not recycled, the part of the carbide slag not only occupies a large amount of land, but also can cause pollution to ecological environment, underground water, soil and the like due to hydrolysis of alkali liquor of the carbide slag and residual carbide. Therefore, it is necessary to solve the problem of difficult recycling of the carbide slag.
To this end, chinese patent application No. 200610031408.0 discloses a method for preparing high-purity fine light calcium carbonate powder from carbide slag, and chinese patent application No. 201310691661.9 discloses a method for preparing nano calcium carbonate from carbide slag as a raw material, although both of the above-mentioned patent applications relate to a method for recycling carbide slag, one of which is used for preparing fine calcium carbonate powder, and the other is used for preparing nano calcium carbonate from carbide slag. However, the methods of both of the above patent applications have problems. Firstly, ammonia water exists in the intermediate product, and the ammonia water belongs to chemical dangerous goods, and has higher storage condition and use requirements; secondly, how to remove the ferryides and carbon residues in the carbide slag is not mentioned, and the ferryides and the carbon residues are main factors influencing the quality and whiteness of the micro-powder calcium carbonate; thirdly, the method has the defects of long process flow, complex process, high impurity content of products, poor product quality and the like. Although chinese patent application No. 201811136653.7 discloses an apparatus and method for producing activated calcium oxide from carbide slag, the application relates to recycling of carbide slag, and particularly, to preparing activated lime from carbide slag, the application adopts flash drying and dynamic calcination methods, which are difficult to use in large-scale industrial production, and the heat collected by the product catcher is used in a multi-stage preheater, which causes significant imbalance and waste of heat.
SUMMERY OF THE UTILITY MODEL
To the problems existing in the prior art, the utility model provides a carbide slag comprehensive utilization device, which can respectively prepare micro powder calcium carbonate (CaCO) according to the actual needs3) The method comprises the steps of preparing calcium carbonate micropowder, a desulfurizing agent (calcium hydroxide) and active lime (calcium oxide), wherein ammonia water does not exist in an intermediate product during preparation of the calcium carbonate micropowder, the quality and whiteness of the calcium carbonate micropowder are effectively improved by removing iron compounds, silicon and carbon, and the method has the characteristics of simple process flow, easiness in operation and low energy consumption.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a device for comprehensively utilizing carbide slag comprises a flotation silicon removal unit, an active lime preparation unit and a micro-powder calcium carbonate preparation unit; the flotation silicon removal unit comprises a flotation stirring tank, a flotation machine and a first filter press; the active lime preparation unit comprises a preheater, a roasting furnace, a cooler and a ball pressing and forming system; the micro powder calcium carbonate preparation unit comprises a strong magnetic separator, a hydrocyclone, a carbonization tank, a thickener, a second filter press and a drying and grinding system; a top feed inlet of the flotation stirring tank is used for inputting a carbide slag raw material, and the carbide slag raw material is output by a carbide preparation system; the bottom discharge port of the flotation stirring tank is communicated with the top feed port of the flotation machine, the top slurry outlet of the flotation machine is used for outputting carbide slag tailing slurry, the bottom discharge port of the flotation machine is used for outputting carbide slag concentrate slurry, the bottom discharge port of the flotation machine is communicated with the feed port of a first filter press, the filtrate outlet of the first filter press is communicated with the top feed port of the flotation stirring tank, the discharge port of the first filter press is used for outputting a calcium hydroxide filter cake, the discharge port of the first filter press is output in two paths, the first path is communicated with the feed port of a preheater and used for preparing active lime, and the second path is communicated with the feed port of a strong magnetic separator and used for preparing micro calcium carbonate; the discharge hole of the preheater is communicated with the feed inlet of the roasting furnace, the discharge hole of the roasting furnace is communicated with the feed inlet of the cooler, the discharge hole of the cooler is communicated with the feed end of the ball pressing and forming system, and the discharge end of the ball pressing and forming system is used for outputting active lime particles; the first discharge port of the strong magnetic separator is used for discharging magnetically separated ferruginous matters, and the second discharge port of the strong magnetic separator is used for outputting calcium hydroxide slurry without ferruginous matters; the second discharge port of the strong magnetic separator is communicated with the top feed port of the hydrocyclone, the bottom slag discharge port of the hydrocyclone is used for discharging solid impurities, the top slurry outlet of the hydrocyclone is used for discharging calcium hydroxide refined slurry, the top slurry outlet of the hydrocyclone is communicated with the top feed port of the carbonization tank, the bottom discharge port of the carbonization tank is used for discharging calcium carbonate slurry, the bottom discharge port of the carbonization tank is communicated with the top feed port of the thickener, the top clarified liquid outlet of the thickener is communicated with the top feed port of the carbonization tank, the bottom discharge port of the thickener is communicated with the feed port of a second filter press, the discharge port of the second filter press is communicated with the feed port of a drying and grinding system, and the discharge port of the drying and grinding system is used for discharging micropowder calcium carbonate.
The comprehensive carbide slag utilizing method includes the following steps:
the method comprises the following steps: flotation silicon and carbon removal
The method comprises the following steps: weighing the carbide slag raw material, inputting the weighed carbide slag raw material into a flotation stirring tank, and simultaneously inputting a quantitative catching agent, a foaming agent and a pH value regulator into the flotation stirring tank to enable the pH value of the carbide slag slurry to be 7.0-7.5;
step two: inputting the carbide slag slurry with the adjusted pH value into a flotation machine, simultaneously inputting a desilication flotation agent into the flotation machine, and carrying out three times of reverse flotation desilication to reduce the silicon content in the carbide slag raw material A to below 1.7%;
step three: after the third reverse flotation desilication of the carbide slag slurry is completed, a decarburization flotation agent is input into the flotation machine, and only one flotation decarburization is performed, so that the carbon content in the carbide slag raw material is reduced to below 0.7%;
step IV: inputting the calcium carbide slag slurry subjected to desiliconization and decarburization into a first filter press, and dehydrating the calcium carbide slag slurry through the first filter press until a calcium hydroxide filter cake with the water content of 12% -17% is formed;
step two: preparation of active lime
The method comprises the following steps: inputting the calcium hydroxide filter cake into a preheater, preheating the calcium hydroxide filter cake in the preheater, wherein the preheated gas is high-temperature waste gas discharged from a roasting furnace, and the temperature of the high-temperature waste gas is 900-1050 ℃;
step two: outputting the preheated calcium hydroxide filter cake in two paths, wherein one path is directly output as a desulfurizer, the water content of the desulfurizer is less than or equal to 0.5 percent, and the other path is put into a roasting furnace for high-temperature roasting at the roasting temperature of 900-1050 ℃ for 2-20 s until active lime is formed;
step three: directly feeding active lime formed after roasting into a cooler, and carrying out step-by-step heat exchange on cold air and the active lime in the cooler until the cold air is heated to 650-800 ℃ and enters a roasting furnace for fuel combustion supporting, and cooling the active lime to below 80 ℃;
step IV: inputting the cooled active lime into a ball pressing forming system, preparing into active lime particles, directly conveying the active lime particles into a calcium carbide preparation system to be used as a raw material, wherein the particle size of the prepared active lime particles is phi 30-phi 90mm, the compressive strength is larger than or equal to 650N, and the falling strength is larger than or equal to 95%;
step three: preparation of micropowder calcium carbonate
The method comprises the following steps: adding water to dilute the calcium hydroxide filter cake until calcium hydroxide slurry with the mass concentration of 10-15% is formed;
step two: inputting the calcium hydroxide slurry into a strong magnetic separator, separating and discharging the ferruginous substance in the calcium hydroxide slurry through the strong magnetic separator, and reducing the content of the ferruginous substance in the calcium hydroxide slurry to be below 0.15%;
step three: inputting the calcium hydroxide slurry without the iron compounds into a hydrocyclone, and separating and discharging solid impurities in the calcium hydroxide slurry through the hydrocyclone;
step IV: inputting the calcium hydroxide slurry without solid impurities into a carbonization tank, inputting carbon dioxide gas into the carbonization tank, and stirring to enable the calcium hydroxide and the carbon dioxide gas to react for 2-10 hours until calcium carbonate slurry is formed in the carbonization tank;
step five: inputting the calcium carbonate slurry into a concentrator, and increasing the mass concentration of the calcium carbonate slurry to 70-75% by the concentrator;
step (c): inputting the thickened calcium carbonate slurry into a second filter press, and dehydrating the calcium carbonate slurry through the second filter press until a calcium carbonate filter cake with the water content of 12-17% is formed;
step (c): and (3) inputting the dehydrated calcium carbonate filter cake into a dry grinding system, and drying and grinding the calcium carbonate filter cake through the dry grinding system at the drying temperature of 70-120 ℃ until micropowder calcium carbonate with the water content of less than 1% is formed.
The utility model has the advantages that:
the utility model discloses a carbide slag comprehensive utilization device can prepare out miropowder calcium carbonate (CaCO) respectively according to actual need3) The method comprises the steps of preparing calcium carbonate micropowder, a desulfurizing agent (calcium hydroxide) and active lime (calcium oxide), wherein ammonia water does not exist in an intermediate product during preparation of the calcium carbonate micropowder, the quality and whiteness of the calcium carbonate micropowder are effectively improved by removing iron compounds, silicon and carbon, and the method has the characteristics of simple process flow, easiness in operation and low energy consumption.
Drawings
FIG. 1 is a schematic structural diagram of a comprehensive carbide slag utilization apparatus of the present invention;
in the figure, 1-a flotation stirring tank, 2-a flotation machine, 3-a first filter press, 4-a preheater, 5-a roasting furnace, 6-a cooler, 7-a ball pressing forming system, 8-a strong magnetic separator, 9-a hydrocyclone, 10-a carbonization tank, 11-a thickener, 12-a second filter press, 13-a dry grinding system, 14-a calcium carbide preparation system, A-a calcium carbide slag raw material, B-a calcium carbide slag tailing slurry, C-a calcium hydroxide filter cake, D-active lime particles, E-an iron compound, F-solid impurities and G-micro calcium carbonate powder.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the device for comprehensively utilizing carbide slag comprises a flotation silicon removal unit, an active lime preparation unit and a micropowder calcium carbonate preparation unit; the flotation silicon removal unit comprises a flotation stirring tank 1, a flotation machine 2 and a first filter press 3; the active lime preparation unit comprises a preheater 4, a roasting furnace 5, a cooler 6 and a ball pressing and forming system 7; the micro powder calcium carbonate preparation unit comprises a strong magnetic separator 8, a hydrocyclone 9, a carbonization tank 10, a concentrator 11, a second filter press 12 and a dry grinding system 13; a top feed inlet of the flotation stirring tank 1 is used for inputting a carbide slag raw material A, and the carbide slag raw material A is output by a carbide preparation system 14; the bottom discharge port of the flotation stirring tank 1 is communicated with the top feed port of the flotation machine 2, the top slurry outlet of the flotation machine 2 is used for outputting the carbide slag tailing slurry B, the bottom discharge port of the flotation machine 2 is used for outputting the carbide slag concentrate slurry, the bottom discharge port of the flotation machine 2 is communicated with the feed port of the first filter press 3, the filtrate outlet of the first filter press 3 is communicated with the top feed port of the flotation stirring tank 1, the discharge port of the first filter press 3 is used for outputting the calcium hydroxide filter cake C, the discharge port of the first filter press 3 is output in two paths, the first path is communicated with the feed port of the preheater 4 and is used for preparing active lime, and the second path is communicated with the feed port of the strong magnetic separator 8 and is used for preparing micro; the discharge hole of the preheater 4 is communicated with the feed inlet of the roasting furnace 5, the discharge hole of the roasting furnace 5 is communicated with the feed inlet of the cooler 6, the discharge hole of the cooler 6 is communicated with the feed end of the ball pressing and forming system 7, and the discharge end of the ball pressing and forming system 7 is used for outputting active lime particles D; a first discharge port of the strong magnetic separator 8 is used for discharging magnetically separated ferrite E, and a second discharge port of the strong magnetic separator 8 is used for outputting calcium hydroxide slurry from which the ferrite E is removed; the second discharge port of the strong magnetic separator 8 is communicated with the top feed port of the hydrocyclone 9, the bottom slag discharge port of the hydrocyclone 9 is used for discharging solid impurities F, the top slurry outlet of the hydrocyclone 9 is used for discharging refined calcium hydroxide slurry, the top slurry outlet of the hydrocyclone 9 is communicated with the top feed port of the carbonization tank 10, the bottom discharge port of the carbonization tank 10 is used for discharging calcium carbonate slurry, the bottom discharge port of the carbonization tank 10 is communicated with the top feed port of the thickener 11, the top clarified liquid outlet of the thickener 11 is communicated with the top feed port of the carbonization tank 10, the bottom discharge port of the thickener 11 is communicated with the feed port of the second filter press 12, the discharge port of the second filter press 12 is communicated with the feed port of the dry grinding system 13, and the discharge port of the dry grinding system 13 is used for discharging micro-powder calcium carbonate G.
In the embodiment, the granularity of the carbide slag raw material A is less than or equal to 0.1mm, the water content of the carbide slag raw material A is 13-16%, the content of an iron compound B in the carbide slag raw material A is 0.5%, the content of silicon in the carbide slag raw material A is 4-5%, and the content of carbon in the carbide slag raw material A is 2%; the flotation agent is divided into a desiliconization flotation agent and a decarburization flotation agent, the desiliconization flotation agent adopts sodium hexametaphosphate and dodecylamine, and the decarburization flotation agent adopts kerosene and 12# oil; the number of the carbonization tanks 10 is 3-12, one part is used for carrying out conventional carbonization reaction, the other part is used for thickening clear liquor, and the two parts of the carbonization tanks 10 are alternately used; the filtrate of the first filter press 3 directly returns to the flotation stirring tank 1 for recycling; the filtrate of the second filter press 12 directly returns to the carbonization tank 10 for recycling; the preheater 4 comprises a dryer and four suspension preheaters which are connected in sequence; the roasting furnace 5 adopts a suspension roasting furnace; the cooler 6 comprises three suspension coolers which are connected in sequence; the ball pressing and forming system 7 comprises a lifter, a bin, a feeder, a ball pressing machine and a vibrating screen which are sequentially connected; the dry grinding system 13 comprises a feeding machine, a drying and grinding machine, a powder selecting machine, a dust remover and a fan which are connected in sequence.
The comprehensive carbide slag utilizing method includes the following steps:
the method comprises the following steps: flotation silicon and carbon removal
The method comprises the following steps: metering a carbide slag raw material A, inputting the weighed carbide slag raw material A into a flotation stirring tank 1, and simultaneously inputting a certain amount of a capture agent, a foaming agent and a pH value regulator into the flotation stirring tank 1 to enable the pH value of carbide slag slurry to be 7.0-7.5;
step two: inputting the carbide slag slurry with the adjusted pH value into a flotation machine 2, simultaneously inputting a desilication flotation agent into the flotation machine 2, and carrying out three times of reverse flotation desilication to reduce the silicon content in the carbide slag raw material A to below 1.7%;
step three: after the carbide slag slurry is subjected to three times of reverse flotation and desilicication, a decarburization flotation agent is input into the flotation machine 2, and only one time of flotation and decarburization is carried out, so that the carbon content in the carbide slag raw material A is reduced to be below 0.7 percent;
step IV: inputting the calcium carbide slag slurry subjected to desiliconization and decarburization into a first filter press 3, and dehydrating the calcium carbide slag slurry through the first filter press 3 until a calcium hydroxide filter cake C with the water content of 12% -17% is formed;
step two: preparation of active lime
The method comprises the following steps: inputting the calcium hydroxide filter cake C into a preheater 4, preheating the calcium hydroxide filter cake C in the preheater 4, wherein the preheated gas is high-temperature waste gas discharged from a roasting furnace 5, and the temperature of the high-temperature waste gas is 900-1050 ℃;
step two: the preheated calcium hydroxide filter cake C is output in two paths, one path is directly output as a desulfurizer, the water content of the desulfurizer is less than or equal to 0.5 percent, and the other path enters a roasting furnace 5 for high-temperature roasting at the roasting temperature of 900-1050 ℃ for 2-20 s until active lime is formed;
step three: directly feeding active lime formed after roasting into a cooler 6, and carrying out gradual heat exchange on cold air and the active lime in the cooler 6 until the cold air is heated to 650-800 ℃ and enters a roasting furnace 5 for fuel combustion supporting, and cooling the active lime to below 80 ℃;
step IV: inputting the cooled active lime into a ball pressing forming system 7, and preparing into active lime particles D, wherein the active lime particles D are directly conveyed into a calcium carbide preparation system 14 to be used as raw materials, the particle size of the prepared active lime particles D is phi 30-phi 90mm, the compressive strength is larger than or equal to 650N, and the falling strength is larger than or equal to 95%;
step three: preparation of micropowder calcium carbonate
The method comprises the following steps: adding water to dilute the calcium hydroxide filter cake C until calcium hydroxide slurry with the mass concentration of 10-15% is formed;
step two: inputting the calcium hydroxide slurry into a strong magnetic separator 8, separating and discharging ferryides E in the calcium hydroxide slurry through the strong magnetic separator 8, and reducing the content of the ferryides E in the calcium hydroxide slurry to be below 0.15%;
step three: inputting the calcium hydroxide slurry without the iron compound E into a hydrocyclone 9, and separating and discharging solid impurities F in the calcium hydroxide slurry through the hydrocyclone 9;
step IV: feeding the calcium hydroxide slurry without the solid impurities F into a carbonization tank 10, feeding carbon dioxide gas into the carbonization tank 10, and stirring to enable the calcium hydroxide and the carbon dioxide gas to react for 2-10 hours until calcium carbonate slurry is formed in the carbonization tank 10;
step five: inputting the calcium carbonate slurry into a thickener 11, and increasing the mass concentration of the calcium carbonate slurry to 70-75% by the thickener 11;
step (c): inputting the thickened calcium carbonate slurry into a second filter press 12, and dehydrating the calcium carbonate slurry through the second filter press 12 until a calcium carbonate filter cake with the water content of 12-17% is formed;
step (c): and (3) inputting the dehydrated calcium carbonate filter cake into a dry grinding system 13, and drying and grinding the calcium carbonate filter cake through the dry grinding system 13 at the drying temperature of 70-120 ℃ until micropowder calcium carbonate G with the water content of less than 1% is formed.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. The utility model provides a carbide slag comprehensive utilization device which characterized in that: comprises a flotation silicon-removing unit, an active lime preparation unit and a micropowder calcium carbonate preparation unit; the flotation silicon removal unit comprises a flotation stirring tank, a flotation machine and a first filter press; the active lime preparation unit comprises a preheater, a roasting furnace, a cooler and a ball pressing and forming system; the micro powder calcium carbonate preparation unit comprises a strong magnetic separator, a hydrocyclone, a carbonization tank, a thickener, a second filter press and a drying and grinding system; a top feed inlet of the flotation stirring tank is used for inputting a carbide slag raw material, and the carbide slag raw material is output by a carbide preparation system; the bottom discharge port of the flotation stirring tank is communicated with the top feed port of the flotation machine, the top slurry outlet of the flotation machine is used for outputting carbide slag tailing slurry, the bottom discharge port of the flotation machine is used for outputting carbide slag concentrate slurry, the bottom discharge port of the flotation machine is communicated with the feed port of a first filter press, the filtrate outlet of the first filter press is communicated with the top feed port of the flotation stirring tank, the discharge port of the first filter press is used for outputting a calcium hydroxide filter cake, the discharge port of the first filter press is output in two paths, the first path is communicated with the feed port of a preheater and used for preparing active lime, and the second path is communicated with the feed port of a strong magnetic separator and used for preparing micro calcium carbonate; the discharge hole of the preheater is communicated with the feed inlet of the roasting furnace, the discharge hole of the roasting furnace is communicated with the feed inlet of the cooler, the discharge hole of the cooler is communicated with the feed end of the ball pressing and forming system, and the discharge end of the ball pressing and forming system is used for outputting active lime particles; the first discharge port of the strong magnetic separator is used for discharging magnetically separated ferruginous matters, and the second discharge port of the strong magnetic separator is used for outputting calcium hydroxide slurry without ferruginous matters; the second discharge port of the strong magnetic separator is communicated with the top feed port of the hydrocyclone, the bottom slag discharge port of the hydrocyclone is used for discharging solid impurities, the top slurry outlet of the hydrocyclone is used for discharging calcium hydroxide refined slurry, the top slurry outlet of the hydrocyclone is communicated with the top feed port of the carbonization tank, the bottom discharge port of the carbonization tank is used for discharging calcium carbonate slurry, the bottom discharge port of the carbonization tank is communicated with the top feed port of the thickener, the top clarified liquid outlet of the thickener is communicated with the top feed port of the carbonization tank, the bottom discharge port of the thickener is communicated with the feed port of a second filter press, the discharge port of the second filter press is communicated with the feed port of a drying and grinding system, and the discharge port of the drying and grinding system is used for discharging micropowder calcium carbonate.
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