Production method of common light calcium carbonate

A light calcium carbonate, production method technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc. Improve the whiteness, the best effect, the effect of improving the whiteness

Inactive Publication Date: 2017-12-29

广西华洋矿源材料有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0004] The object of the invention of the present invention is, in view of the above-mentioned problem, provide a kind of production method of common light calcium carbonate...

Abstract

The invention discloses a production method of common light calcium carbonate, and belongs to the field of a production method of calcium carbonate. In a production process, limestone is taken as a main raw material, and requirements on auxiliary raw materials of water and fuel are higher; the limestone and the fuel are calcined to obtain lime and carbon dioxide, a digestion reaction is performed on the lime and the water to obtain calcium hydroxide emulsion, and a carbonization reaction is performed on the carbon dioxide and the calcium hydroxide emulsion to obtain the light calcium carbonate. According to the production method, the problem that the particle size and the viscosity of a product in the production process are difficult in control can be solved, continuous production can be realized by using conventional equipment, the product is good and stable in quality, and the whiteness of the calcium carbonate produced by the production method reaches 95-97 degrees.

Application Domain

Calcium/strontium/barium carbonates

Technology Topic

ChemistryEmulsion +8

Examples

Experimental program(3)

Example Embodiment

[0030] Example 1

[0031] A production method of ordinary light calcium carbonate, including the following steps

[0032] 1) Raw material preparation:

[0033] Limestone: chemical composition required by weight: CaO54%, MgO1.0%, SiO 2 1.5%, Mn≤0.006%, Fe 2 O 3 0.1% and impurity 0.2%; physical properties requirements: compact block, no recrystallization, porosity 1%, density: 2.80g/cm3, Mohs hardness of 3 and compressive strength of 117.6Mpa; limestone entering the kiln is broken to the size 150mm; For ore containing clay or mud, washing must be carried out after crushing to remove soil and impurities;

[0034] Water: Suspended matter 20mg/L, transparency 30cm, hydrochloric acid insoluble matter (SiO 2 ) 10 mg/l, magnesium oxide (MgO) 100 mg/l, iron oxide (Fe 2 O 3 ) 10 mg/L;

[0035] The coke components and their weight ratios are as follows: fixed carbon 80%, moisture 3%, volatile content 4.5%, ash 12%, and sulfur 0.5%, particle size 40mm, calorific value 29309KJ/kg;

[0036] 2) Calcination, kiln gas washing: limestone raw materials with a particle size of 150mm and fuel with a lumpiness of 30mm are sent to the lime kiln by the distributor, the ratio of the limestone raw materials to fuel is 9:1, and air is blown into the lime kiln for calcination , Limestone is decomposed into lime and CO2 tail gas at high temperature; lime is discharged by the vibrating ash discharging machine and separated ash, and sent to the digestion section workshop; the CO2 tail gas is cooled by the heat exchanger and enters the cyclone dust collector, spray dust collector, The water scrubbing tower washes away the smoke and sulfide gas and then enters the gas-water separator to separate the water mist, and the purified lime kiln gas is sent to the carbon chemical section;

[0037] 3) Digestion and pulping: After the quicklime sent from the lime calcination section is crushed by the crusher, it is added to the digester by the bucket elevator through the hopper and feeder, where the lime and the process water are hydrated into Ca(OH) ) 2 emulsion, the concentration of the Ca(OH) 2 emulsion is 10%-30%, the chemical reaction formula of the lime digestion process is as follows:

[0038] CaO+H 2 O=Ca(OH) 2

[0039] During the digestion reaction, sodium thiosulfate, ethylenediamine, and perdiboric acid, which accounted for the mass of calcium hydroxide, were added, of which sodium thiosulfate, ethylenediamine, and perdiboric acid accounted for 0.8%, 0.5%, and 0.5% of the mass of calcium hydroxide, respectively. 0.4%, the temperature of the digestion reaction is 100℃, and the time is 50min;

[0040] After the digestion reaction is over, it flows into the coarse slurry tank after removing the slag. The coarse slurry that continues to react in the coarse slurry tank is pumped into the cyclone cleaner by the slag removing pump to clean the insoluble ash in the ash and then purify it into a refined slurry. The seminal slurry is sent to the carbonization workshop with a sizing pump;

[0041] 4) Carbonization and enrichment:

[0042] The lime kiln gas is compressed to 0.049 MPa by a fan, and enters the carbonization tower through the oil-air separator; the Ca(OH) 2 emulsion and CO content in the carbonization tower 2 Gas undergoes carbonization reaction to generate CaCO 3 The carbonization reaction formula is as follows:

[0043] Ca(OH) 2 +CO 2 =CaCO 3 +H 2 O

[0044] When the pH value of the reaction solution drops to 7-8, it indicates that the reaction is about to be completed. After the carbonization is completed, 0.5% of the weight of the reducing agent is added to the suspended calcium carbonate slurry. The reducing agent is sodium disulfite, thiourea dioxide and One or more mixtures of hydrazine hydrochloride, slurry concentration 50%, temperature 90℃, stirring treatment for 120 minutes; the cooked slurry after carbonization is removed by vibrating screen and then enters the thickening tank for thickening, the thickened slurry The material is sent to the dehydration and drying section;

[0045] 5) Dehydration and drying: The slurry sent from the thickening tank is sent to the dehydrator for dehydration. The filter cake with 30% water content after dehydration is crushed and then sent to the dryer for drying. The final moisture content of the material is 0.3%. The dryer adopts heat conduction. Oil is used as the heating medium, and the heat transfer oil at 250°C is provided by an organic heating medium boiler. The dry product is sent to the screening and packaging section by the conveyor;

[0046] 6) Screening and packaging: The finished product is screened by a screening machine to a qualified particle size, and then sent to an automatic packaging machine to pack the finished product into storage, and the finished product is packaged in a polypropylene woven bag.

Example Embodiment

[0047] Example 2

[0048] A production method of ordinary light calcium carbonate, including the following steps

[0049] 1) Raw material preparation:

[0050] Limestone: chemical composition required by weight: CaO57%, MgO1.5%, SiO 2 1%, Mn0.004%, Fe 2 O 3 0.08% and impurity 0.15%; physical property requirements: compact block, non-recrystallized, porosity 0.8%, density: 2.7g/cm3, Mohs hardness 3. and compressive strength 117.6Mpa; the limestone entering the kiln is broken to particle size 120mm; For ore containing clay or mud, washing must be carried out after crushing to remove soil and impurities;

[0051] Water: Suspended matter 20mg/L, transparency 30cm, hydrochloric acid insoluble matter (SiO 2 ) 10 mg/l, magnesium oxide (MgO) 100 mg/l, iron oxide (Fe 2 O 3 ) 10 mg/L;

[0052] The fuel is a 1:1 mixture of anthracite and bituminous coal by weight. The components of anthracite and the weight ratio of each component are as follows: fixed carbon 75%, moisture 6%, volatile content 10%, ash content 16% and sulfur 1.5%, particle size 3240mm, calorific value 27216KJ/kg; the bituminous coal components and their weight ratios are as follows: fixed carbon 50%, moisture 6%, volatile matter 25% and ash 30%, particle size 30mm, calorific value 24000KJ/kg;

[0053] 2) Calcination and kiln gas washing: limestone raw materials with a particle size of 150mm and fuel with a lumpiness of 30mm are sent to the lime kiln by the distributor, and the ratio of the limestone raw materials to fuel is 8:2, and air is blown at the bottom of the lime kiln for calcination , Limestone is decomposed into lime and CO2 tail gas at high temperature; lime is discharged by the vibrating ash discharging machine and separated ash, and sent to the digestion section workshop; the CO2 tail gas is cooled by the heat exchanger and enters the cyclone dust collector, spray dust collector, The water scrubbing tower washes away the smoke and sulfide gas and then enters the gas-water separator to separate the water mist, and the purified lime kiln gas is sent to the carbon chemical section;

[0054] 3) Digestion and pulping: After the quicklime sent from the lime calcination section is crushed by the crusher, it is added to the digester by the bucket elevator through the hopper and feeder, where the lime and the process water are hydrated into Ca(OH) ) 2 emulsion, the concentration of the Ca(OH) 2 emulsion is 10%-30%, the chemical reaction formula of the lime digestion process is as follows:

[0055] CaO+H 2 O=Ca(OH) 2

[0056] During the digestion reaction, sodium thiosulfate, ethylenediamine, and perdiboric acid, which accounted for the mass of calcium hydroxide, were added, of which sodium thiosulfate, ethylenediamine, and perdiboric acid accounted for 0.7%, 0.4%, and 0.4% of the mass of calcium hydroxide, respectively. 0.32%, the temperature of the digestion reaction is 70℃, and the time is 35min;

[0057] After the digestion reaction is over, it flows into the coarse slurry tank after removing the slag. The coarse slurry that continues to react in the coarse slurry tank is pumped into the cyclone cleaner by the slag removing pump to clean the insoluble ash in the ash and then purify it into a refined slurry. The seminal slurry is sent to the carbonization workshop with a sizing pump;

[0058] 4) Carbonization and enrichment:

[0059] The lime kiln gas is compressed to 0.049 MPa by a fan, and enters the carbonization tower through the oil-air separator; the Ca(OH) 2 emulsion and CO content in the carbonization tower 2 Gas undergoes carbonization reaction to generate CaCO 3 The carbonization reaction formula is as follows:

[0060] Ca(OH) 2 +CO 2 =CaCO 3 +H 2 O

[0061] When the pH value of the reaction solution drops to 7.5, it indicates that the reaction is about to be completed. After the carbonization is completed, 0.3% of the weight of the reducing agent is added to the suspended calcium carbonate slurry. The reducing agent is sodium disulfite, thiourea dioxide and hydrazine hydrochloride. A mixture of one or more of them, the slurry concentration is 35%, the temperature is 60°C, and the stirring treatment is 75 minutes; the cooked slurry after carbonization is removed by the vibrating screen and then enters the thickening tank for thickening, and the thickened slurry is sent To dehydration and drying section;

[0062] 5) Dehydration and drying: The slurry sent from the thickening tank is sent to the dehydrator for dehydration. The filter cake with 30% water content after dehydration is crushed and then sent to the dryer for drying. The final moisture content of the material is 0.3%. The dryer adopts heat conduction. Oil is used as the heating medium, and the heat transfer oil at 250°C is provided by an organic heating medium boiler. The dry product is sent to the screening and packaging section by the conveyor;

[0063] 6) Screening and packaging: The finished product is screened by a screening machine to a qualified particle size, and then sent to an automatic packaging machine to pack the finished product into storage, and the finished product is packaged in a polypropylene woven bag.

Example Embodiment

[0064] Example 3

[0065] A production method of ordinary light calcium carbonate, including the following steps

[0066] 1) Raw material preparation:

[0067] Limestone: chemical composition required by weight: CaO54%, MgO1.0%, SiO 2 1.5%, Mn0.006%, Fe 2 O 3 0.1% and impurities; physical property requirements: compact block, no recrystallization, porosity ≤1%, density: 2.65~2.80g/cm3, Mohs hardness 3 and compressive strength 117.6Mpa; the limestone entering the kiln is crushed to particle size 80mm; For ore containing clay or mud, washing must be carried out after crushing to remove soil and impurities;

[0068] Water: Suspended matter 20mg/L, transparency 30cm, hydrochloric acid insoluble matter (SiO 2 ) 10 mg/l, magnesium oxide (MgO) 100 mg/l, iron oxide (Fe 2 O 3 ) 10 mg/L;

[0069] Fuel: coke components and the weight ratio of each component are as follows: fixed carbon 80%, moisture 3%, volatile content 4.5%, ash content 12%, sulfur content 0.5%, particle size 40mm, calorific value 29309KJ/kg;

[0070] 2) Calcination, kiln gas washing: limestone raw materials with a particle size of 150mm and fuel with a lumpiness of 30mm are sent to the lime kiln by the distributor, the ratio of the limestone raw materials to fuel is 9:1, and air is blown into the lime kiln for calcination , Limestone is decomposed into lime and CO2 tail gas at high temperature; lime is discharged by the vibrating ash discharging machine and separated ash, and sent to the digestion section workshop; the CO2 tail gas is cooled by the heat exchanger and enters the cyclone dust collector, spray dust collector, The water scrubbing tower washes away the smoke and sulfide gas and then enters the gas-water separator to separate the water mist, and the purified lime kiln gas is sent to the carbon chemical section;

[0071] 3) Digestion and pulping: After the quicklime sent from the lime calcination section is crushed by the crusher, it is added to the digester by the bucket elevator through the hopper and feeder, where the lime and the process water are hydrated into Ca(OH) ) 2 emulsion, the concentration of the Ca(OH) 2 emulsion is 10%-30%, the chemical reaction formula of the lime digestion process is as follows:

[0072] CaO+H 2 O=Ca(OH) 2

[0073] During the digestion reaction, sodium thiosulfate, ethylenediamine, and perdiboric acid, which account for the mass of calcium hydroxide, were added, of which sodium thiosulfate, ethylenediamine, and perdiboric acid accounted for 0.6%, 0.3%, and 0.3% of the mass of calcium hydroxide, respectively. 0.24%, the temperature of the digestion reaction is 50℃, and the time is 20min;

[0074] After the digestion reaction is over, it flows into the coarse slurry tank after removing the slag. The coarse slurry that continues to react in the coarse slurry tank is pumped into the cyclone cleaner by the slag removing pump to clean the insoluble ash in the ash and then purify it into a refined slurry. The seminal slurry is sent to the carbonization workshop with a sizing pump;

[0075] 4) Carbonization and enrichment:

[0076] The lime kiln gas is compressed to 0.049 MPa by a fan, and enters the carbonization tower through the oil-air separator; the Ca(OH) 2 emulsion and CO content in the carbonization tower 2 Gas undergoes carbonization reaction to generate CaCO 3 The carbonization reaction formula is as follows:

[0077] Ca(OH) 2 +CO 2 =CaCO 3 +H 2 O

[0078] When the pH of the reaction solution drops to 7, it indicates that the reaction is about to be completed. After the carbonization is completed, 0.01% of the weight of the reducing agent is added to the suspended calcium carbonate slurry. The reducing agents are sodium disulfite, thiourea dioxide and hydrazine hydrochloride A mixture of one or more of them, the slurry concentration is 8%, the temperature is 30°C, and the stirring treatment is 30 minutes; the cooked slurry after carbonization is removed by the vibrating screen and then enters the thickening tank for thickening, and the thickened slurry is sent To dehydration and drying section;

[0079] 5) Dehydration and drying: The slurry sent from the thickening tank is sent to the dehydrator for dehydration. The filter cake with 30% water content after dehydration is crushed and then sent to the dryer for drying. The final moisture content of the material is 0.3%. The dryer adopts heat conduction. Oil is used as the heating medium, and the heat transfer oil at 250°C is provided by an organic heating medium boiler. The dry product is sent to the screening and packaging section by the conveyor;

[0080] 6) Screening and packaging: The finished product is screened by a screening machine to a qualified particle size, and then sent to an automatic packaging machine to pack the finished product into storage, and the finished product is packaged in a polypropylene woven bag.

[0081] CaCO in the light calcium carbonate produced by the method in Example 1-3 and the light calcium carbonate produced by the common method 3 Content, volatile content at 105℃, whiteness and 1-1.5um particle size content are shown in Table 1

[0082] Table 1 The detection data table of the light calcium carbonate produced by the method of Examples 1-3 and the light calcium carbonate produced by the ordinary method:

[0083]

[0084] It can be seen from Table 1 that the CaCO3 content of the light calcium carbonate produced in Examples 1-3 is 1.2%, 1.1% and 1.5% higher than that of the light calcium carbonate produced by ordinary methods; The volatile content of the light calcium carbonate produced by the conventional method is 0.15%, 0.17%, and 0.16% lower than the light calcium carbonate produced by the ordinary method at 105°C. The light calcium carbonate produced in Examples 1-3 is lower than that produced by the ordinary method. The whiteness of the light calcium carbonate is 3.1, 3.5 and 3.8 higher, respectively; the light calcium carbonate produced in Examples 1-3 is 4.0% and 4.4% higher than the light calcium carbonate 1-1.5um produced by ordinary methods. And 4.3%; the light calcium carbonate produced by the method of the present invention has a better effect.

PUM

Property	Measurement	Unit
Density	2.8	g/cm³
Compressive strength	118.0	mPa
Granularity	40.0	mm

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Classification and recommendation of technical efficacy words

high whiteness
good effect

Production method of common light calcium carbonate

A light calcium carbonate, production method technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc. Improve the whiteness, the best effect, the effect of improving the whiteness

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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