CN104387024A - Method for preparing bricks from waste siliceous stone coal vanadium ore - Google Patents

Method for preparing bricks from waste siliceous stone coal vanadium ore Download PDF

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CN104387024A
CN104387024A CN201410560084.4A CN201410560084A CN104387024A CN 104387024 A CN104387024 A CN 104387024A CN 201410560084 A CN201410560084 A CN 201410560084A CN 104387024 A CN104387024 A CN 104387024A
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coal vanadium
bone coal
abandoned mine
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CN104387024B (en
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叶香竹
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Pizhou Dongbo Information Technology Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/60Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes

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Abstract

The invention discloses a method for preparing bricks from waste siliceous stone coal vanadium ores. The method is characterized by comprising the following preparation steps: (1) preparing raw materials; (2) smashing; (3) stirring for the first time, wherein the first-time stirring time is 5-6 min, and the rotating speed is 60-80 r/min; (4) wheel-grinding by adopting a wheel-grinding machine, wherein the forming moisture content is confirmed to be 13%; (5) stirring for the second time, wherein the second-time stirring time is 4-5 min, and the rotating speed is 90-120 r/min; (6) aging, wherein the aging time is 72 h, and the volume of an aging bin is larger than 2000 m<3>; (7) extruding under the vacuum condition, wherein the vacuum degree of minus 0.092-minus 0.094 MPa is ensured, and the extruding pressure of 2.6-3.0 MPa is ensured; (8) drying, wherein the air humidity at the machine inlet end of a drying room is controlled to be 85-95%, and the air supply temperature is controlled to be 80-120 DEG C; (9) calcinating, wherein the calcination cycle is 42 h, the temperature is increased by 50 DEG C per hour from the beginning to the 14th hour on average, and the temperature is increased by 30 DEG C per hour from the 14th hour to the 22th hour on average, the temperature is kept constant from the 20th hour to the 42th hour, and the constant temperature is 950-970 DEG C. The product prepared by the method is excellent in the forming quality and reliable in the mechanical property.

Description

Siliceous bone coal vanadium abandoned mine prepares the method for brick
Technical field
The present invention relates to building material field, particularly a kind of siliceous bone coal vanadium abandoned mine prepares the method for brick.
Background technology
Siliceous bone coal navajoite is very abundant at China's reserves, is distributed widely in the provinces such as China Hunan, Shaanxi, Guangxi, Zhejiang.From siliceous bone coal navajoite, extract Vanadium Pentoxide in FLAKES well applied, the Vanadium Pentoxide in FLAKES refined is mainly used in iron and steel, glass and ceramic industry, sulfuric acid and petrochemical complex production industry.Develop and utilize significant to the siliceous bone coal vanadium abandoned mine be disposed.
Table 1 is the chemical composition of siliceous bone coal vanadium abandoned mine, according to the chemical composition of siliceous bone coal vanadium abandoned mine, is feasible by its brickmaking.We are studied it, and find that subject matter is brick blank cracking, the major cause of blank cracking is: base substrate is intensity difference because plasticity index is low, and the digestion time of siliceous bone coal vanadium abandoned mine is short in addition, and in raw material, the naturally osmotic pressure of moisture can not play a role.Kiln parameter is unreasonable is also one of another reason of brick blank cracking.
The chemical composition of table 1 siliceous bone coal vanadium abandoned mine
Summary of the invention
The object of the present invention is to provide a kind of siliceous bone coal vanadium abandoned mine to prepare the method for brick, overcome the problem of brick blank cracking.
Preparation process of the present invention is:
(1) raw material preparation.
CaO is a kind of solubility promoter, can reduce the refractoriness of raw material, and its content should control about 2%, should more than 10%.CaO content 9.5% ~ 9.9% in siliceous bone coal vanadium abandoned mine, close to ultimate value.The CaO of high-content makes the firing range of raw material become narrow, brings great difficulty to baking operation, under the condition not having automatic control equipment, be even difficult to operation.When the particle of CaO is more than 2mm, Wingdale explosion will be produced, reduce the intensity of goods.MgO is meeting and the SO in flue gas in roasting process 2reaction generates MgSO 4, and magnesium sulfate is very harmful impurity, and magnesium sulfate is water-soluble is seeped into surface, when magnesium sulfate can form xln-bloom after moisture evaporation, goods is damaged, and content of MgO should more than 2%, and the content of the MgO of siliceous bone coal vanadium abandoned mine is 2.1% ~ 2.6%.In order to improve the SiO in siliceous bone coal vanadium abandoned mine 2content, reduces CaO, content of MgO, and make raw material more meet the requirement of producing perforated brick, siliceous bone coal vanadium abandoned mine is mixed and joined clay, and clay particle diameter is less than 2mm, and the weight of clay is 30% of total raw material weight.
The content of CaO can be reduced after the present invention mixes clay, maturing temperature scope is broadened, improve roasting quality, mix the content that clay also can reduce MgO, avoid the scum phenomenon of goods.The glassy phase formed when can increase roasting melting after mixing clay, in order to the gap between filler particles, reduces the water-intake rate of finished product, improves the anti-freezing property of finished product and the intensity of goods, and this point seems for the area of high weathering zone and is even more important.
The serious brickmaking quality of the low meeting of raw material plasticity index, siliceous bone coal vanadium abandoned mine mixes clay and can significantly improve raw material plasticity index, thus improves the processability of raw material.If the plasticity index of siliceous bone coal navajoite is less than 7, molding effect can not reach requirement, and there is more macrobead on the surface of base substrate, after body drying, defines obvious fine cracks around oarse-grained.Plasticity index is an important indicator of the original characteristic of reflection, and its height is except depending on the performance of siliceous bone coal vanadium abandoned mine self, also relevant with the fineness pulverized.For siliceous bone coal vanadium abandoned mine, grinding particle size is thinner, steel quantity consumption and current consumption more, it is uneconomic for increasing plasticity-with this.Test shows, for producing the siliceous bone coal vanadium abandoned mine of brick, particle diameter is less than 2mm, and the granule content of below 0.5mm is greater than 60%.Table 2 is the plasticity index of clay, siliceous bone coal vanadium abandoned mine, compound, and table 2 is the plasticity index of clay, siliceous bone coal vanadium abandoned mine, compound, and table 2 shows to substantially increase raw material plasticity index after clay mixes, and processability is promoted significantly.
The plasticity index of table 2 clay, siliceous bone coal vanadium abandoned mine, compound
Clay Siliceous bone coal vanadium abandoned mine Compound
Plasticity index 12.3 7.5 9.5
(2) pulverize.Disintegrating apparatus adopts beater grinder, strengthens the mechanical treatment to raw material.In siliceous bone coal vanadium abandoned mine, the content of Wingdale is high, should process in small, broken bits be carried out, ensure that grain graininess is less than 2mm, when the abrasion loss of tup is more than or equal to 5mm, will tup be changed, ensure that the particle that broken rear granularity is less than 0.5mm reaches more than 60%, improve plasticity index.
(3) first time stirs.First time, churning time was 5 ~ 6min, and rotating speed is 60 ~ 80r/min, then adds water and makes it to be mixed into plastic shape.Because of material light weight, should adopt forced stirrer that mixing of materials just can be made even, increase degree of compactness, create conditions to shaping.Churning time, rotary speed parameter are directly related with moulding moisture and Forming Quality, this parameter be through lot of experiments obtain.
Stirrer will repair welding blade in time, ensures that the blade of stirrer and the gap of machine chamber wall are less than 5mm.
(4) rolling.Adopt wheel roller to carry out rolling, by the further homogenizing blended stock of rolling, the stable of material forming water ratio will be controlled during rolling, the water ratio quality that will affect base substrate fluctuated.Time too high, reduce blank strength, extend the drying and dehydrating time; Time too low, increase power consumption and equipment attrition.Therefore, must according to material characteristic, determine a best shaping water ratio.Time shaping, required supplementary moisture adds in wheel roller, avoids adding in forcing machine, and like this, billet surface can not form moisture film.According to test-results, shaping water ratio is defined as 13%.
Wheel roller will repair welding blade in time, ensures that the scraper plate of wheel roller and the gap in face, hole are less than 2mm.
(5) second time stirs.Second time churning time is 4 ~ 5min, and rotating speed is 90 ~ 120r/min.Steam-heated cal(l)andria is passed into when secondary stirring.In drying process, blank cracking is the major cause of restriction rate of drying, because the outer water ratio of base substrate internal layer has big difference, dry shrinkage is different, outside velocity of diffusion is fast and shrink large, and internal divergence speed is slow and shrink little, defines pulling force to the skin of base substrate, pulling force makes internal layer skin shrink inconsistent, causes base substrate to produce cracking.So, in adobe the velocity of diffusion of moisture be determine brick bat drying quality and drying cycle length important factor.Steam heating has following advantages: 1) steam treatment can reduce the viscosity of water in raw material, wet raw material better, the stickiness of shaping rear base substrate free water is reduced, because the viscosity of steam is less than the viscosity in base substrate water, it is thinning that water vapour makes the moisture film being wrapped in feed particles tail off, and can mutually slide better between particle; 2) velocity of diffusion of moisture improves, because the temperature of water vapour is high, good fluidity, makes raw material fully discongest, and improve the plasticity of raw material, the wet conduction of base substrate can sharply increase, and makes inner diffusing rate and external diffusion speed reach balance; 3) can realize dry quickly and evenly, because steam heating shortens the heat-up time of base substrate in kiln, accelerate the inner diffusing rate of base substrate; The internal and external temperature uniformity of base substrate, when namely fluctuation occurs the condition such as temperature, humidity, wind speed of drying medium (flue gas extracted in kiln), also little on the impact of base substrate, reduce shrink of product and drying shrinkage phenomenon.Steam heating under equal conditions, can reduce raw aqueous rate 3% ~ 5%, can by drying shrinkage cycle time 10% ~ 15%.This technology of steam heating is of practical significance very much.After adding water vapour, also can reduce the wearing and tearing of the component such as machine mouth, mould, forcing machine screw reamer, extend its work-ing life, alleviate machine maintenance quantities, saved steel.Steam heating can also improve the output of forcing machine, and the present invention is before heating steam, and the output of forcing machine is per minute 10, and after adding water vapour, the output of forcing machine is per minute 10.2.
(6) ageing
Ageing is carried out in ageing storehouse, and digestion time is 72h, and the volume of aging bunker is greater than 2000m 3, maturing equipment adopts reversible moving formula distributor.After adopting steam heating raw material, distribute a part of water vapour heating cold water, reusable heat water replaces cold water to add stirrer, like this, after raw material enters aging bunker, just can improve moisture homogenizing osmotic pressure and seepage velocity, destroy the natural structure of raw material, reach the object of ageing, humidifying, make the rheological body that raw material becomes good.
(7) vacuum extruding
Improve the intensity of base substrate by high vacuum tightness and squeeze, base substrate pressure break and distortion can be avoided, because have a large amount of air in original particle, these air occupy a certain amount of volume in original, and can be compressed, after the squeezed machine outlet of mud bar, volumetric expansion, destroys blank strength.Air generally containing 2% ~ 6% in newly shaping base substrate, for the raw material without thin process, if do not adopt steam heating, without under vacuum or rough vacuum effect, air capacity in base substrate can reach 2 times of above-mentioned value, air is present in raw material in the form of bubbles by water seal, these air reduce the velocity of diffusion of moisture, delay water to the moistening of raw material and discongest effect.Hinder the combination between feed particles and particle, reduce plasticity index and the degree of compactness of raw material, and can not combine well between the feed particles that the screw reamer of forcing machine is cut, goods are made to form S shape crackle and spiricle, time serious, mud bar one machine outlet expands, and causes base substrate to produce tiny crack.After taking vacuum-treat, air in raw material is drawn out of, in addition have employed steam heating raw material, destroy the surface tension of moisture film, feed particles is drawn close further, particle links ability and improves, base substrate is easily shaping, and shaping rear snappiness is good, and non-deformability strengthens, even if base substrate rolls base platform through irregular, base substrate also can not be out of shape.In a word, the technique that vacuum-treat and steam heating raw material combine is complementary, can also improve density and the mechanical strength of goods, reduces the water-intake rate of goods, improves anti-freezing property.Vacuum tightness should ensure at-0.092 ~-0.094MPa, ensures extrusion pressure 2.6 ~ 3.0MPa.
(8) dry
The atmospheric moisture that kiln enters car end controls 85% ~ 95%, and wind pushing temperature controls at 80 DEG C ~ 120 DEG C.The draught fan matching of steam boiler is saved, replaces with the induced draft fan of annular kiln, eliminate the induced draft fan of a steam boiler and mutual motor, improve the hot blast temperature entering kiln, the cigarette heat of boiler is fully utilized, protects environment.
If preheating zone, heating zone, this three band of cooling zone design unreasonable, green part area can be in negative-pressure operation, base substrate can be subject to brushing of clammy air, base substrate is immersed in water vapour for a long time, in addition shortage of heat is sent, heat-up rate is low, and in whole preheating zone, billet surface has serious dew condensation phenomenon.Base substrate is not only heated, not draining, on the contrary by the immersion of water vapour.Three of kiln bands are determined as calculated: the length dimension of " three bands " respectively: preheating zone 26m, heating zone 17m, cooling zone 17m, the size of exhaust outlet is 0.4m 2.
The present invention increases air quantity and the blast of blower fan than conventional fan, and fan parameter adopts as follows: blast is 1200Pa, and air quantity is 120000m 3/ h, motor is 45kw, and revolution is 1700r/min, and after increasing the air quantity of blower fan and blast, the output of kiln brings up to daily output more than 60,000 pieces by producing 2 ~ 30,000 pieces daily.
(9) roasting
Firing cycle is the average intensification per hour 50 DEG C of 42h, 0th ~ 14h, and the average intensification per hour 30 DEG C of 14h ~ 22h, 20h ~ 42h constant temperature, thermostat temperature is 950 ~ 970 DEG C.
Products made thereby Forming Quality of the present invention is good, and mechanical property is reliable, and effectively utilizes ore deposit process waste products, has good application prospect.
Embodiment
Below the present embodiment is described in detail.
The present embodiment preparation process is:
(1) raw material preparation.
Siliceous bone coal vanadium abandoned mine is mixed and is joined clay, and clay particle diameter is less than 2mm, and the weight of clay is 30% of total raw material weight.
(2) pulverize.
Disintegrating apparatus adopts beater grinder, strengthens the mechanical treatment to raw material.In siliceous bone coal vanadium abandoned mine, the content of Wingdale is high, should carry out process in small, broken bits, ensure that grain graininess is less than 2mm, will change tup when the abrasion loss of tup is more than or equal to 5mm, ensures that the particle that broken rear granularity is less than 0.5mm reaches more than 60%.
(3) first time stirs.
First time, churning time was 5 ~ 6min, and rotating speed is 60 ~ 80r/min, then adds water and makes it to be mixed into plastic shape.Stirrer will repair welding blade in time, ensures that the blade of stirrer and the gap of machine chamber wall are less than 5mm.
(4) rolling.
Adopt wheel roller to carry out rolling, by the further homogenizing blended stock of rolling, shaping water ratio is defined as 13%.Wheel roller will repair welding blade in time, ensures that the scraper plate of wheel roller and the gap in face, hole are less than 2mm.
(5) second time stirs.
Second time churning time is 4 ~ 5min, and rotating speed is 90 ~ 120r/min.Steam-heated cal(l)andria is passed into when secondary stirring.
(6) ageing
Ageing is carried out in ageing storehouse, and digestion time is 72h, and the volume of aging bunker is greater than 2000m 3, maturing equipment adopts reversible moving formula distributor.
(7) vacuum extruding
Vacuum tightness should ensure at-0.092 ~-0.094MPa, ensures extrusion pressure 2.6 ~ 3.0MPa.
(8) dry
The atmospheric moisture that kiln enters car end controls 85% ~ 95%, and wind pushing temperature controls at 80 DEG C ~ 120 DEG C.
Preheating zone 26m, heating zone 17m, cooling zone 17m, the size of exhaust outlet is 0.4m 2.
Fan parameter adopts as follows: blast is 1200Pa, and air quantity is 120000m 3/ h, motor is 45kw, and revolution is 1700r/min.
(9) roasting
Firing cycle is the average intensification per hour 50 DEG C of 42h, 0th ~ 14h, and the average intensification per hour 30 DEG C of 14h ~ 22h, 20h ~ 42h constant temperature, thermostat temperature is 950 ~ 970 DEG C.

Claims (6)

1. siliceous bone coal vanadium abandoned mine prepares a method for brick, it is characterized in that preparation process is:
(1) raw material preparation.
Siliceous bone coal vanadium abandoned mine is mixed and is joined clay, and clay particle diameter is less than 2mm, and the weight of clay is 30% of total raw material weight.
(2) pulverize.
Disintegrating apparatus adopts beater grinder, ensures that grain graininess is less than 2mm, ensures that the particle that broken rear granularity is less than 0.5mm reaches more than 60%.
(3) first time stirs.
First time, churning time was 5 ~ 6min, and rotating speed is 60 ~ 80r/min, then adds water and makes it to be mixed into plastic shape.
(4) rolling.
Adopt wheel roller to carry out rolling, shaping water ratio is defined as 13%.
(5) second time stirs.
Second time churning time is 4 ~ 5min, and rotating speed is 90 ~ 120r/min.
(6) ageing
Digestion time is 72h, and the volume of aging bunker is greater than 2000m 3, maturing equipment adopts reversible moving formula distributor.
(7) vacuum extruding
Vacuum tightness should ensure at-0.092 ~-0.094MPa, ensures extrusion pressure 2.6 ~ 3.0MPa.
(8) dry
The atmospheric moisture that kiln enters car end controls 85% ~ 95%, and wind pushing temperature controls at 80 DEG C ~ 120 DEG C.
(9) roasting
Firing cycle is the average intensification per hour 50 DEG C of 42h, 0th ~ 14h, and the average intensification per hour 30 DEG C of 14h ~ 22h, 20h ~ 42h constant temperature, thermostat temperature is 950 ~ 970 DEG C.
2. siliceous bone coal vanadium abandoned mine according to claim 1 prepares the method for brick, it is characterized in that stirrer will repair welding blade in time, ensures that the blade of stirrer and the gap of machine chamber wall are less than 5mm.
3. siliceous bone coal vanadium abandoned mine according to claim 1 prepares the method for brick, it is characterized in that wheel roller will repair welding blade in time, ensures that the scraper plate of wheel roller and the gap in face, hole are less than 2mm.
4. siliceous bone coal vanadium abandoned mine according to claim 1 prepares the method for brick, it is characterized in that passing into steam-heated cal(l)andria when second time stirs.
5. siliceous bone coal vanadium abandoned mine according to claim 1 prepares the method for brick, and it is characterized in that kiln preheating zone 26m, heating zone 17m, cooling zone 17m, the size of exhaust outlet is 0.4m 2.
6. siliceous bone coal vanadium abandoned mine according to claim 1 prepares the method for brick, it is characterized in that kiln fan parameter adopts as follows: blast is 1200Pa, and air quantity is 120000m 3/ h, motor is 45kw, and revolution is 1700r/min.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111153680A (en) * 2020-01-06 2020-05-15 南平市建阳区三顺建材有限公司 Production process and equipment of antique blue brick
CN112079625A (en) * 2020-09-08 2020-12-15 夏志勇 Production process of light composite wallboard

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1167671A (en) * 1997-06-27 1997-12-17 黄常仁 Production process of high-doped fly ash clay sintered brick
CN101705730A (en) * 2009-11-26 2010-05-12 攀钢集团研究院有限公司 Sintered hollow brick and manufacturing method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1167671A (en) * 1997-06-27 1997-12-17 黄常仁 Production process of high-doped fly ash clay sintered brick
CN101705730A (en) * 2009-11-26 2010-05-12 攀钢集团研究院有限公司 Sintered hollow brick and manufacturing method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
朱军等: "石煤提钒尾矿制备烧结砖的研究", 《硅酸盐通报》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111153680A (en) * 2020-01-06 2020-05-15 南平市建阳区三顺建材有限公司 Production process and equipment of antique blue brick
CN112079625A (en) * 2020-09-08 2020-12-15 夏志勇 Production process of light composite wallboard

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