CN103058249B - Equipment and process for producing food-grade calcium carbonate by gypsum - Google Patents
Equipment and process for producing food-grade calcium carbonate by gypsum Download PDFInfo
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- CN103058249B CN103058249B CN201310001695.0A CN201310001695A CN103058249B CN 103058249 B CN103058249 B CN 103058249B CN 201310001695 A CN201310001695 A CN 201310001695A CN 103058249 B CN103058249 B CN 103058249B
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- calcium carbonate
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- grade calcium
- food
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 134
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 67
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 40
- 239000010440 gypsum Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims description 30
- 239000000243 solution Substances 0.000 claims description 27
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 22
- 239000000706 filtrate Substances 0.000 claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 claims description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 3
- 235000019270 ammonium chloride Nutrition 0.000 claims description 3
- 229910001424 calcium ion Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 10
- 239000011575 calcium Substances 0.000 abstract description 10
- 229910052791 calcium Inorganic materials 0.000 abstract description 10
- 235000013305 food Nutrition 0.000 abstract description 9
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 9
- 235000013361 beverage Nutrition 0.000 abstract description 8
- 230000009965 odorless effect Effects 0.000 abstract description 7
- 230000009967 tasteless effect Effects 0.000 abstract description 7
- 235000013336 milk Nutrition 0.000 abstract description 2
- 239000008267 milk Substances 0.000 abstract description 2
- 210000004080 milk Anatomy 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract 2
- 239000000047 product Substances 0.000 description 14
- 229910052785 arsenic Inorganic materials 0.000 description 6
- 229910052793 cadmium Inorganic materials 0.000 description 6
- 229910052753 mercury Inorganic materials 0.000 description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 5
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 5
- 229910052788 barium Inorganic materials 0.000 description 5
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 5
- 229910052728 basic metal Inorganic materials 0.000 description 5
- 150000003818 basic metals Chemical class 0.000 description 5
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229910052731 fluorine Inorganic materials 0.000 description 5
- 239000011737 fluorine Substances 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- MBLBDJOUHNCFQT-LXGUWJNJSA-N aldehydo-N-acetyl-D-glucosamine Chemical compound CC(=O)N[C@@H](C=O)[C@@H](O)[C@H](O)[C@H](O)CO MBLBDJOUHNCFQT-LXGUWJNJSA-N 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000011260 aqueous acid Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 235000010855 food raising agent Nutrition 0.000 description 1
- 235000013622 meat product Nutrition 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 235000008935 nutritious Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Coloring Foods And Improving Nutritive Qualities (AREA)
Abstract
The invention discloses equipment and a process for producing food-grade calcium carbonate by gypsum. The equipment comprises a deslagging extruding machine, a spraying nozzle, a hopper, a tilted filter net I, a drying extruding machine and a reaction chamber, wherein the included angle between the spraying nozzle and a horizontal plane is 30-80 degrees; the hopper is positioned above the tilted filter net I; the bottom of the tilted filter net I is opened and connected with a feed cylinder I of the deslagging extruding machine; a filter net II is arranged at a part of the feed cylinder I of the deslagging extruding machine corresponding to the opening in the bottom of the tilted filter net I; a gas pipe communicated to the bottom is also arranged in the reaction chamber; a liquid discharge pipe with a filter function is arranged at the front end of the feed cylinder II of the drying extruding machine; and a heater is mounted on the outer wall of a feed cylinder II of the position of the drying extruding machine close to the liquid discharge pipe. The invention further discloses the process for food-grade calcium carbonate by the gypsum. The food-grade calcium carbonate prepared with the equipment and the process is pure white ultrafine powder, is odorless, tasteless, high in calcium content, very low in impurity content and heavy metal content and good in mouth feel, and can be applied to the fields of foods, beverages, milk products, healthcare products and the like.
Description
Technical field
The present invention relates to a kind of equipment and technology producing calcium carbonate, especially relate to a kind of equipment and technology of gypsum production food-grade calcium carbonate.
Background technology
Food-grade calcium carbonate is widely used in the protective foods industries such as the modern life is replenished the calcium, nutritious prod, is the high-quality nutritional enrichment additives of the industry such as milk preparation, meat product and flour products, milk-product, calcium tablet, beverage; Can also be used as raising agent, make food fluffy, mouthfeel is better.
According to the requirement of GB14880-94 and GB2760, using calcium carbonate as foodstuff additive, not only there is restriction to its addition, strict index is all defined to the quality of calcium carbonate and hygienic requirements simultaneously, require content Pb≤0.0003wt%, As≤0.0003wt%, Hg≤0.0003wt%, Cd≤0.0002% of heavy metal in calcium carbonate.
The production method of food-grade calcium carbonate is a lot, can be divided into wet method and dry method two kinds substantially.
Chinese invention patent application 200510029843.5 discloses the treatment process of a kind of crab and shrimp shell recycling, it soaks crab and shrimp shell with alkali or acid solution, decalcification or albumen, containing a large amount of calcium chloride in filtrate after decalcification, add sodium carbonate, can precipitation of calcium carbonate be obtained, after filtration, washing, dry, namely obtain the food-grade calcium carbonate powder that white is trickle.But, crab and shrimp shell resource-constrained.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the deficiencies in the prior art, provides a kind of equipment and technology of gypsum production food-grade calcium carbonate of abundant raw material source, and obtained food-grade calcium carbonate, foreign matter content is few, and calcium contents is high, heavy metal content is low, and mouthfeel is good.
The technical scheme that the present invention solves the employing of its technical problem is:
The equipment of the gypsum production food-grade calcium carbonate of the present invention, comprise deslagging forcing machine, nozzle, hopper, tilting filter screen I, dry forcing machine, reaction chamber, described nozzle is connected with sparge pipe, the angle of nozzle and horizontal plane is 30-80 degree (preferred 45-60 degree), described tilting filter screen I is except the one side parallel with nozzle is plane, other parts can be planes, also can be curved surfaces; Distance between nozzle and tilting filter screen I can be regulated by the movement of nozzle, and the distance of nozzle and tilting filter screen I can be 5-40cm (preferred 8-25cm); Described hopper is positioned at the top of tilting filter screen I, the bottom opening of described tilting filter screen I, be connected with the barrel I of deslagging forcing machine, the part that the barrel I of deslagging forcing machine is corresponding with tilting filter screen I bottom opening is provided with filter screen II, and barrel I end of deslagging forcing machine is provided with slag-drip opening; The tracheae towards bottom is also provided with in described reaction chamber; Barrel II front end of described oven dry forcing machine is provided with the liquid discharge pipe with filtering function, and dry forcing machine and be provided with well heater near barrel II outer wall of liquid discharge pipe, the end of barrel II is provided with discharge port.
Further, order number >=3000 order of described tilting filter screen I and filter screen II.
In the present invention, nozzle is parallel with the one side of tilting filter screen I, be the vertical direction toward impact in order to ensure water and material, increases contact surface, is beneficial to dissolving, and nozzle just can rotate with given speed tilting filter screen I, can avoid the dead angle in dissolution process.
The working process of the equipment of the gypsum production food-grade calcium carbonate of the present invention, the i.e. technique of the gypsum production food-grade calcium carbonate of the present invention, comprise the following steps: dropped into by gypsum powder in hopper, under gravity, gypsum powder falls in tilting filter screen I one side parallel with nozzle; By the nozzle that is connected with sparge pipe to the tilting filter screen I one side spray solution parallel with nozzle, the rotating speed of nozzle is 2-10rpm, the flow velocity of solution in sparge pipe is 1-5m/s, gypsum powder on tilting filter screen I is dissolved, undissolved impurity slips the barrel I below tilting filter screen I under gravity, a small amount of solution that impurity carries, by filter screen II filtration in barrel I, enters reaction chamber, and undissolved impurity is discharged by the slag-drip opening of deslagging forcing machine; In the filtrate of reaction chamber, pass into carbon dioxide by tracheae simultaneously, generate carbonic acid, the calcium ion in carbanion and filtrate reacts, and generation calcium carbonate, forms suspension calciferous; Suspension calciferous has the liquid discharge pipe of filtering function by barrel II, and filtrate is discharged from liquid discharge pipe, and filter residue and calcium carbonate are delivered to the heating zone heating, drying of well heater by drying forcing machine, then by discharge hole for discharge, obtain food-grade calcium carbonate;
Solution in described sparge pipe be following in any one:
1. containing 25-45wt% ammonium citrate or 8-12wt% hydrochloric acid or both mixed aqueous solutions;
2. containing the solution of 18-28wt% ammonium chloride;
3. containing the solution of 8-12wt% hydrochloric acid, 3-6wt% calcium chloride, 3-6wt% magnesium chloride.
The food-grade calcium carbonate that the present invention obtains is pure white ultrafine powder, odorless, tasteless, there is calcium contents high, foreign matter content is few, heavy metal content is extremely low, the features such as mouthfeel is good, indices reaches and is better than the requirement of standard GB/T 1898-2007, can be widely used in the fields such as food, beverage, milk-product, healthcare products.
Accompanying drawing explanation
Fig. 1 is the structural representation of the apparatus embodiments of the gypsum production food-grade calcium carbonate of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1
With reference to accompanying drawing, the equipment of the gypsum production food-grade calcium carbonate of the present embodiment, comprise deslagging forcing machine 1, nozzle 4, hopper 5, tilting filter screen I 6, dry forcing machine 11, reaction chamber 12, described nozzle 4 is connected with sparge pipe 3, nozzle 4 is 45 degree with the angle of horizontal plane, described tilting filter screen I 6 is except the one side parallel with nozzle 4 is plane, and other parts are curved surfaces; Distance between nozzle 4 and tilting filter screen I 6 can be regulated by the movement of nozzle 4, and nozzle 4 is 20cm with the distance of tilting filter screen I 6; Described hopper 5 is positioned at the top of tilting filter screen I 6, the bottom opening of described tilting filter screen I 6, be connected with barrel I 13-1 of deslagging forcing machine 1, the part that barrel I 13-1 of deslagging forcing machine 1 is corresponding with tilting filter screen I 6 bottom opening is provided with filter screen II 14, and the barrel I 13-1 end of deslagging forcing machine 1 is provided with slag-drip opening 2; The tracheae 7 towards bottom is also provided with in described reaction chamber 12; The barrel II 13-2 front end of described oven dry forcing machine 11 is provided with the liquid discharge pipe 8 with filtering function, and dry forcing machine 11 and be provided with well heater 9 near the barrel II 13-2 outer wall of liquid discharge pipe 8, the end of barrel II 13-2 is provided with discharge port 10.
The order number of described tilting filter screen I 6 and filter screen II 14 is 3000 orders.
In the present embodiment, nozzle 4 is parallel with the one side of tilting filter screen I 6, be the vertical direction toward impact in order to ensure water and material, increases contact surface, is beneficial to dissolving, and nozzle 4 just can rotate with given speed tilting filter screen I 6, can avoid the dead angle in dissolution process.
The working process of the equipment of the gypsum production food-grade calcium carbonate of the present embodiment, the i.e. technique of the gypsum production food-grade calcium carbonate of the present embodiment, comprise the following steps: dropped into by gypsum powder in hopper 5, under gravity, gypsum powder falls in tilting filter screen I 6 one side parallel with nozzle 4; By the nozzle 4 that is connected with sparge pipe 3 to the tilting filter screen I 6 one side spray solution parallel with nozzle 4, the rotating speed of nozzle 4 is 2rpm, the flow velocity of solution in sparge pipe 3 is 1m/s, gypsum powder on tilting filter screen I 6 is dissolved, undissolved impurity slips barrel I 13-1 below tilting filter screen I 6 under gravity, a small amount of solution that impurity carries is filtered by the filter screen II 14 of barrel I 13-1, and enter reaction chamber 12, undissolved impurity is discharged by the slag-drip opening 2 of deslagging forcing machine 1; In the filtrate of reaction chamber 12, pass into carbon dioxide by tracheae 7 simultaneously, generate carbonic acid, the calcium ion in carbanion and filtrate reacts, and generation calcium carbonate, forms suspension calciferous; Suspension calciferous has the liquid discharge pipe 8 of filtering function by barrel II 13-2, filtrate is discharged from liquid discharge pipe 8, filter residue and calcium carbonate are delivered to the heating zone heating, drying of well heater 9 by drying forcing machine 11, then by discharge port 10 discharging, obtain food-grade calcium carbonate.
Solution in described sparge pipe 3 is the aqueous solution containing 35wt% ammonium citrate.
The food-grade calcium carbonate that the present embodiment obtains is pure white ultrafine powder, odorless, tasteless, there is calcium contents high, foreign matter content is few, heavy metal content is extremely low, the features such as mouthfeel is good, indices reaches and is better than the requirement (concrete test result is as shown in table 1) of standard GB/T 1898-2007, can be widely used in the fields such as food, beverage, milk-product, healthcare products.
Table 1 embodiment 1 gained calcium carbonate test result
| Project | National standard | Embodiment 1 |
| Calcium carbonate massfraction (in butt)/% | 98.0-100.5 | 99.2 |
| Massfraction/the % of hydrochloric acid insoluble substance | ≤0.2 | 0.1 |
| Massfraction/the % of basic metal and magnesium | ≤0.1 | 0.02 |
| Massfraction/the % of barium | ≤0.030 | 0.011 |
| Massfraction/the % of arsenic | ≤0.0003 | 0.0001 |
| Massfraction/the % of loss on drying | ≤2.0 | 1.4 |
| Massfraction/the % of fluorine | ≤0.005 | 0.003 |
| Plumbous massfraction/% | ≤0.0003 | 0.0001 |
| Massfraction/the % of mercury | ≤0.0001 | 0.0000 |
| Massfraction/the % of cadmium | ≤0.0002 | 0.0001 |
Embodiment 2
In the equipment of the gypsum production food-grade calcium carbonate of the present embodiment, nozzle 4 is 30 degree with the angle of horizontal plane; Described tilting filter screen I 6 is except the one side parallel with nozzle 4 is plane, and other parts are also planes; Nozzle 4 is 5cm with the distance of tilting filter screen I 6; The order number of described tilting filter screen I and filter screen II is 3200 orders.Other is identical with embodiment 1.
The working process of the equipment of the gypsum production food-grade calcium carbonate of the present embodiment, the i.e. technique of the gypsum production food-grade calcium carbonate of the present embodiment, the rotating speed of nozzle is 5rpm, and the flow velocity of solution in sparge pipe is 2m/s.
Solution in described sparge pipe is for containing 10wt% salt aqueous acid.Other are identical with embodiment 1.
The food-grade calcium carbonate that the present embodiment obtains is pure white ultrafine powder, odorless, tasteless, there is calcium contents high, foreign matter content is few, heavy metal content is extremely low, the features such as mouthfeel is good, indices reaches and is better than the requirement (concrete test result is as shown in table 2) of standard GB/T 1898-2007, can be widely used in the fields such as food, beverage, milk-product, healthcare products.
Table 2 embodiment 2 gained calcium carbonate test result
| Project | National standard | Embodiment 2 |
| Calcium carbonate massfraction (in butt)/% | 98-100.5 | 99.4 |
| Massfraction/the % of hydrochloric acid insoluble substance | ≤0.2 | 0.1 |
| Massfraction/the % of basic metal and magnesium | ≤0.1 | 0.02 |
| Massfraction/the % of barium | ≤0.030 | 0.011 |
| Massfraction/the % of arsenic | ≤0.0003 | 0.0001 |
| Massfraction/the % of loss on drying | ≤2.0 | 1.4 |
| Massfraction/the % of fluorine | ≤0.005 | 0.003 |
| Plumbous massfraction/% | ≤0.0003 | 0.0001 |
| Massfraction/the % of mercury | ≤0.0001 | 0.0000 |
| Massfraction/the % of cadmium | ≤0.0002 | 0.0001 |
Embodiment 3
The equipment of the gypsum production food-grade calcium carbonate of the present embodiment, the angle of nozzle and horizontal plane is 60 degree; Described tilting filter screen I 6 is except the one side parallel with nozzle 4 is plane, and other parts are curved surface; Nozzle 4 is 10cm with the distance of tilting filter screen I 6; The order number of described tilting filter screen I 6 and filter screen II 14 is 3100 orders.Other are identical with embodiment 1.
The working process of the equipment of the gypsum production food-grade calcium carbonate of the present embodiment, the i.e. technique of the gypsum production food-grade calcium carbonate of the present embodiment, the rotating speed of nozzle is 8rpm, and the flow velocity of solution in sparge pipe is 3m/s.
Solution in described sparge pipe is the mixed aqueous solution containing 25wt% ammonium citrate and 10wt% hydrochloric acid.Other are identical with embodiment 1.
The food-grade calcium carbonate that the present embodiment obtains is pure white ultrafine powder, odorless, tasteless, there is calcium contents high, foreign matter content is few, heavy metal content is extremely low, the features such as mouthfeel is good, indices reaches and is better than the requirement (concrete test result is as shown in table 3) of standard GB/T 1898-2007, can be widely used in the fields such as food, beverage, milk-product, healthcare products.
Table 3 embodiment 3 gained calcium carbonate test result
| Project | National standard | Embodiment 3 |
| Calcium carbonate massfraction (in butt)/% | 98-100.5 | 99.8 |
| Massfraction/the % of hydrochloric acid insoluble substance | ≤0.2 | 0.1 |
| Massfraction/the % of basic metal and magnesium | ≤0.1 | 0.02 |
| Massfraction/the % of barium | ≤0.030 | 0.011 |
| Massfraction/the % of arsenic | ≤0.0003 | 0.0001 |
| Massfraction/the % of loss on drying | ≤2.0 | 1.4 |
| Massfraction/the % of fluorine | ≤0.005 | 0.003 |
| Plumbous massfraction/% | ≤0.0003 | 0.0001 |
| Massfraction/the % of mercury | ≤0.0001 | 0.0000 |
| Massfraction/the % of cadmium | ≤0.0002 | 0.0001 |
Embodiment 4
The equipment of the gypsum production food-grade calcium carbonate of the present embodiment, nozzle 4 is 80 degree with the angle of horizontal plane; Described tilting filter screen I 6 is except the one side parallel with nozzle 4 is plane, and other parts are curved surfaces; Nozzle 4 is 25cm with the distance of tilting filter screen I 6; The order number of described tilting filter screen I 6 and filter screen II 14 is 3500 orders.Other are identical with embodiment 1.
The working process of the equipment of the gypsum production food-grade calcium carbonate of the present embodiment, the i.e. technique of the gypsum production food-grade calcium carbonate of the present embodiment, the rotating speed of nozzle is 10rpm, and the flow velocity of solution in sparge pipe is 4m/s.
Solution in described sparge pipe is the solution containing 18-28wt% ammonium chloride.Other are identical with embodiment 1.
The food-grade calcium carbonate that the present embodiment obtains is pure white ultrafine powder, odorless, tasteless, there is calcium contents high, foreign matter content is few, heavy metal content is extremely low, the features such as mouthfeel is good, indices reaches and is better than the requirement (concrete test result is as shown in table 4) of standard GB/T 1898-2007, can be widely used in the fields such as food, beverage, milk-product, healthcare products.
Table 4 embodiment 4 gained calcium carbonate test result
| Project | National standard | Embodiment 4 |
| Calcium carbonate massfraction (in butt)/% | 98-100.5 | 99.7 |
| Massfraction/the % of hydrochloric acid insoluble substance | ≤0.2 | 0.1 |
| Massfraction/the % of basic metal and magnesium | ≤0.1 | 0.02 |
| Massfraction/the % of barium | ≤0.030 | 0.011 |
| Massfraction/the % of arsenic | ≤0.0003 | 0.0001 |
| Massfraction/the % of loss on drying | ≤2.0 | 1.4 |
| Massfraction/the % of fluorine | ≤0.005 | 0.003 |
| Plumbous massfraction/% | ≤0.0003 | 0.0001 |
| Massfraction/the % of mercury | ≤0.0001 | 0.0000 |
| Massfraction/the % of cadmium | ≤0.0002 | 0.0001 |
Embodiment 5
The equipment of the gypsum production food-grade calcium carbonate of the present embodiment, nozzle 4 is 75 degree with the angle of horizontal plane; Described tilting filter screen I 6 is except the one side parallel with nozzle 4 is plane, and other parts are also planes; Nozzle 4 is 40cm with the distance of tilting filter screen I 6; The order number of described tilting filter screen I 6 and filter screen II 14 is 4000 orders.Other are identical with embodiment 1.
The working process of the equipment of the gypsum production food-grade calcium carbonate of the present embodiment, the i.e. technique of the gypsum production food-grade calcium carbonate of the present embodiment, the rotating speed of nozzle is 9rpm, and the flow velocity of solution in sparge pipe is 5m/s.
Solution in described sparge pipe is the solution containing 10wt% hydrochloric acid, 4wt% calcium chloride, 4wt% magnesium chloride.Other are identical with embodiment 1.
The food-grade calcium carbonate that the present embodiment obtains is pure white ultrafine powder, odorless, tasteless, there is calcium contents high, foreign matter content is few, heavy metal content is extremely low, the features such as mouthfeel is good, indices reaches and is better than the requirement (concrete test result is as shown in table 5) of standard GB/T 1898-2007, can be widely used in the fields such as food, beverage, milk-product, healthcare products.
Table 5 embodiment 5 gained calcium carbonate test result
| Project | National standard | Embodiment 5 |
| Calcium carbonate massfraction (in butt)/% | 98-100.5 | 99.9 |
| Massfraction/the % of hydrochloric acid insoluble substance | ≤0.2 | 0.1 |
| Massfraction/the % of basic metal and magnesium | ≤0.1 | 0.02 |
| Massfraction/the % of barium | ≤0.030 | 0.011 |
| Massfraction/the % of arsenic | ≤0.0003 | 0.0001 |
| Massfraction/the % of loss on drying | ≤2.0 | 1.4 |
| Massfraction/the % of fluorine | ≤0.005 | 0.003 |
| Plumbous massfraction/% | ≤0.0003 | 0.0001 |
| Massfraction/the % of mercury | ≤0.0001 | 0.0000 |
| Massfraction/the % of cadmium | ≤0.0002 | 0.0001 |
Claims (6)
1. the equipment of a gypsum production food-grade calcium carbonate, it is characterized in that, comprise deslagging forcing machine, nozzle, hopper, tilting filter screen I, dry forcing machine, reaction chamber, described nozzle is connected with sparge pipe, the angle of nozzle and horizontal plane is 30-80 degree, and described tilting filter screen I one side parallel with nozzle is plane; Distance between nozzle and tilting filter screen I is regulated by the movement of nozzle; Described hopper is positioned at the top of tilting filter screen I, the bottom opening of described tilting filter screen I, be connected with the barrel I of deslagging forcing machine, the part that the barrel I of deslagging forcing machine is corresponding with tilting filter screen I bottom opening is provided with filter screen II, and barrel I end of deslagging forcing machine is provided with slag-drip opening; The tracheae towards bottom is also provided with in described reaction chamber; Barrel II front end of described oven dry forcing machine is provided with the liquid discharge pipe with filtering function, and dry forcing machine and be provided with well heater near barrel II outer wall of liquid discharge pipe, the end of barrel II is provided with discharge port.
2. the equipment of gypsum production food-grade calcium carbonate according to claim 1, is characterized in that, the angle of described nozzle and horizontal plane is 45-60 degree.
3. the equipment of gypsum production food-grade calcium carbonate according to claim 1 and 2, is characterized in that, the distance of nozzle and tilting filter screen I is 5-40cm.
4. the equipment of gypsum production food-grade calcium carbonate according to claim 3, is characterized in that, the distance of nozzle and tilting filter screen I is 8-25cm.
5. the equipment of gypsum production food-grade calcium carbonate according to claim 1 and 2, is characterized in that, order number >=3000 order of described tilting filter screen I and filter screen II.
6. one kind uses the technique of the device fabrication food-grade calcium carbonate of gypsum production food-grade calcium carbonate as described in one of claim 1-5, it is characterized in that, comprise the following steps: gypsum powder is dropped in hopper, under gravity, gypsum powder falls in tilting filter screen I one side parallel with nozzle; By the nozzle that is connected with sparge pipe to the tilting filter screen I one side spray solution parallel with nozzle, the rotating speed of nozzle is 2-10rpm, the flow velocity of solution in sparge pipe is 1-5m/s, gypsum powder on tilting filter screen I is dissolved, undissolved impurity slips the barrel I below tilting filter screen I under gravity, a small amount of solution that impurity carries, by filter screen II filtration in barrel I, enters reaction chamber, and undissolved impurity is discharged by the slag-drip opening of deslagging forcing machine; In the filtrate of reaction chamber, pass into carbon dioxide by tracheae simultaneously, generate carbonic acid, the calcium ion in carbanion and filtrate reacts, and generation calcium carbonate, forms suspension calciferous; Suspension calciferous has the liquid discharge pipe of filtering function by barrel II, and filtrate is discharged from liquid discharge pipe, and filter residue and calcium carbonate are delivered to the heating zone heating, drying of well heater by drying forcing machine, then by discharge hole for discharge, obtain food-grade calcium carbonate;
Solution in described sparge pipe be following in any one:
1. containing 25-45wt% ammonium citrate or 8-12wt% hydrochloric acid or both mixed aqueous solutions;
2. containing the solution of 18-28wt% ammonium chloride;
3. containing the solution of 8-12wt% hydrochloric acid, 3-6wt% calcium chloride, 3-6wt% magnesium chloride.
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| CN101774561A (en) * | 2010-01-29 | 2010-07-14 | 连云港树人科创食品添加剂有限公司 | Preparation process of large-particle food-grade calcium hydrophosphate |
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Effective date of registration: 20160823 Address after: An Industrial Park Economic Development Zone, Changde City, Hunan province Linli County 415200 Patentee after: Hunan Fu Xiang new type building material Co., Ltd. Address before: 410005, 12 floor, Haidong mansion, Furong Road, Changsha, Hunan Patentee before: Liu Liwen |