CN1584130A - Method for producing land plaster whiskers from phosphoric acid - Google Patents
Method for producing land plaster whiskers from phosphoric acid Download PDFInfo
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- CN1584130A CN1584130A CN 200410024348 CN200410024348A CN1584130A CN 1584130 A CN1584130 A CN 1584130A CN 200410024348 CN200410024348 CN 200410024348 CN 200410024348 A CN200410024348 A CN 200410024348A CN 1584130 A CN1584130 A CN 1584130A
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- phosphoric acid
- gypsum
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- whisker
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Abstract
Production of gypsum in phosphorous liquid involves preparing a phosphorous extracting liquid and a gypsum crystal whisker suspending liquid. The phosphorous extracting liquid is prepared by extracting 30 - 40% phosphorous acid with ores at 50 - 95deg.C for 2 - 4h, separating liquid phase and filtering to obtain products with H3PO4 3 - 4mol/L and Ca2+ 0.8 - 1.2mol/L. The suspending liquid is prepared by adding the said liquid into 30 - 35% sulfuric acid solution gradually, stirring and reacting at (50 - 100)deg.C for 120 - 150min. Hemi-hydrated or anhydrous gypsum whiskers are obtained after filtering the suspending liquid, cleansing with boiled water, and drying at (120 - 200)deg.C. The process reduces generating temperature and cost in production, shortens production time, and qualifies their performance, so that it can be widely used in production of gypsum whiskers.
Description
Technical field
The invention belongs to crystal whisker of gypsum manufacturing technology field, more particularly relate to the improvement of in phosphoric acid, making the method for crystal whisker of gypsum.
Background technology
Crystal whisker of gypsum is meant that diameter is the 1-4 micron, and length is bar-shaped (anhydrous, half water or two water) calcium sulphate crystal of 10-200 micron.
At present, the production method of crystal whisker of gypsum mainly contains following two kinds:
(1) the hot method of hydraulic pressure with massfraction less than 2% dihydrate gypsum be added in the water autoclave, under the effect of saturated steam, transform through certain hour and to generate the needle-like gypsum crystal, filter then, dry and form.Solid-to-liquid ratio is few owing to feed intake, and uses pressure exerting device again, and the production cost of the hot decree crystal whisker of gypsum of hydraulic pressure is high.Thereby in fact very difficult industrialization.
(2) sulfuric acid and the useful water-soluble Ca salt of soluble calcium salt reaction method or calcium ion and sulfuric acid react the generation crystal whisker of gypsum.Vitriolic uses, and has not only increased production cost, strengthens the pollution to environment, simultaneously economization scale operation is restricted.
The manufacture method of crystal whisker of gypsum in the past, most of is raw material with the plaster of paris, under pressurization, operational stage more than 100 ℃, transforms through the long time and to generate crystal whisker of gypsum.Production rate is slow, production unit is complicated.In phosphoric acid by wet process manufacturing process in the past, add sulfuric acid and phosphorus ore and generate phosphoric acid and phosphogypsum.Phosphorus content is generally more than 1.5% in the by product phosphogypsum, and phosphorus content is higher than phosphogypsum more than 0.5% and no matter is as chemical feedstocks, or as material of construction, all is subjected to many restrictions.Pile up like a mountain for many enterprises phosphogypsum, becomes social effects of pollution.The phosphogypsum problem has become technical barrier, becomes the restraining factors that can the phosphorous chemical industry industry Sustainable development.
Summary of the invention
Purpose of the present invention just is to overcome above-mentioned shortcoming and defect, and the Wet-process Phosphoric Acid Production process is transformed, and the phosphorus content in the phosphogypsum is reduced to below 0.5%, can satisfy the requirement of building trade to environmental protection index comprehensively; Phosphogypsum is transformed into crystal whisker of gypsum, and the mechanical property of crystal whisker of gypsum and range of application are considerably beyond common gypsum; With phosphoric acid or mixture of sulfuric phosphoric acid is working medium, reduces generation temperature, the shortening growth time of whisker, makes whisker growth neat, and the production cost of crystal whisker of gypsum is descended significantly.
In order to achieve the above object, the present invention includes the step of producing of producing step and half water or dehydrated gyp-whisker of producing step, crystal whisker of gypsum suspension of phosphoric acid leaching liquid.To be to use excessive concentration be that 30～40% phosphoric acid and phosphorus ore leach chemical reaction to the step of producing of phosphoric acid leaching liquid, and controlled temperature is 50-95 ℃, through 2-4 hour reaction, tells liquid phase and filtered, and obtains containing H
3PO
43-4mol/L, Ca
2+0.8-1.2mol/L the phosphoric acid leaching liquid.The step of producing of crystal whisker of gypsum suspension is under stirring action, the phosphoric acid leaching liquid is added in the sulphuric acid soln that concentration is 30-35% gradually, stirring reaction is 120～150 minutes under 50～100 ℃ condition, generates crystal whisker of gypsum and is suspended in phosphoric acid or the mixture of sulfuric phosphoric acid.The step of producing of half water or dehydrated gyp-whisker is that drying forms under 120～200 ℃ temperature with above-mentioned crystal whisker of gypsum suspension filtered, with after the boiling water washing.
To be to use excessive concentration be that 35% phosphoric acid and phosphorus ore leach chemical reaction to the step of producing of above-mentioned phosphoric acid leaching liquid.Using excessive concentration is that 35% phosphatase reaction speed is fast, and production efficiency height, production cost are also lower.
The step of producing of crystal whisker of gypsum suspension is under stirring action, and the phosphoric acid leaching liquid is added in the sulphuric acid soln that concentration is 30-35% gradually, and stirring reaction is 120～150 minutes under 90～95 ℃ condition.90～95 ℃ reaction conditions can make equally that the speed of producing of crystal whisker of gypsum suspension is fast, efficient is high, cost is low, and is effective.
The present invention does medium with phosphoric acid or mixture of sulfuric phosphoric acid, makes calcium sulfate crystal whiskers with the compound (as calcium oxide, calcium hydroxide, lime carbonate, calcium chloride, nitrocalcite) of sulfuric acid, sulfate ion and calcium; Or in the Wet-process Phosphoric Acid Production process, make calcium sulfate crystal whiskers.
The present invention separates the formation reaction of the acid-leaching reaction of phosphorus ore and phosphogypsum and carries out.At first use excessive phosphoric acid and phosphorus ore to leach chemical reaction, controlled temperature is 50-95 ℃, through 2-4 hour reaction, tells liquid phase and is also filtered, and obtains containing H
3PO
43-4mol/L, Ca
2+0.8-1.2mol/L the phosphoric acid leaching liquid.Under stirring action, the phosphoric acid leaching liquid is added gradually in the sulphuric acid soln of 20-40%, generate crystal whisker of gypsum and be suspended in phosphoric acid or the mixture of sulfuric phosphoric acid.Crystal whisker of gypsum is leached, washs, dries, and the control bake out temperature obtains half water or dehydrated gyp-whisker, and wherein phosphorus content is below 0.5%.
Another kind of the present invention is made the method for crystal whisker of gypsum in phosphoric acid, it comprises the step of producing of producing step and half water or dehydrated gyp-whisker of producing step, crystal whisker of gypsum suspension of phosphoric acid leaching liquid.To be to use excessive concentration be that 35% phosphoric acid and lime carbonate leach chemical reaction to the step of producing of phosphoric acid leaching liquid, stirs, and tells liquid phase and filtered, and obtains the phosphoric acid leaching liquid.The step of producing of crystal whisker of gypsum suspension is under stirring action, and it is that stirring reaction is 120 minutes under 95 ℃ condition in 35% the sulphuric acid soln that the phosphoric acid leaching liquid is added concentration gradually, generates crystal whisker of gypsum and is suspended in phosphoric acid or the mixture of sulfuric phosphoric acid.The step of producing of half water or dehydrated gyp-whisker is that drying forms under 120 ℃ temperature with above-mentioned crystal whisker of gypsum suspension filtered, with after the boiling water washing.
The present invention can reduce generation temperature, the shortening growth time of whisker, makes whisker growth neat, and the production cost of crystal whisker of gypsum is descended significantly.Compare with existing Wet-process Phosphoric Acid Production process, production process of the present invention only increases by one and filters operation and gypsum baking operation, just can produce excellent property, snow-white, the broad-spectrum crystal whisker of gypsum of outward appearance, and its mechanical property is considerably beyond common gypsum.Its low production cost is that any up to now production method is all incomparable.
Embodiment
Embodiment 1.A kind of method of in phosphoric acid, making crystal whisker of gypsum.It comprises the phosphoric acid leaching liquid produce step, crystal whisker of gypsum suspension produce steps such as producing of step and half water or dehydrated gyp-whisker.To be to use excessive concentration be that 35% phosphoric acid and phosphorus ore leach chemical reaction to the step of producing of phosphoric acid leaching liquid, and controlled temperature is 95 ℃, through 2 hours reaction, tells liquid phase and filtered, and obtains containing H
3PO
43-4mol/L, Ca
2+0.8-1.2mol/L the phosphoric acid leaching liquid.The step of producing of crystal whisker of gypsum suspension is under stirring action, and it is that stirring reaction is 120 minutes under 100 ℃ condition in 32% the sulphuric acid soln that the phosphoric acid leaching liquid is added concentration gradually, generates crystal whisker of gypsum and is suspended in phosphoric acid or the mixture of sulfuric phosphoric acid.The step of producing of half water or dehydrated gyp-whisker is that drying forms under 200 ℃ temperature with above-mentioned crystal whisker of gypsum suspension filtered, with after the boiling water washing.
Embodiment 2.A kind of method of in phosphoric acid, making crystal whisker of gypsum.It comprises the phosphoric acid leaching liquid produce step, crystal whisker of gypsum suspension produce steps such as producing of step and half water or dehydrated gyp-whisker.To be to use excessive concentration be that 40% phosphoric acid and phosphorus ore leach chemical reaction to the step of producing of phosphoric acid leaching liquid, and controlled temperature is 50 ℃, through 3 hours reaction, tells liquid phase and filtered, and obtains containing H
3PO
43-4mol/L, Ca
2+0.8-1.2mol/L the phosphoric acid leaching liquid.The step of producing of crystal whisker of gypsum suspension is under stirring action, and it is that stirring reaction is 130 minutes under 50 ℃ condition in 35% the sulphuric acid soln that the phosphoric acid leaching liquid is added concentration gradually, generates crystal whisker of gypsum and is suspended in phosphoric acid or the mixture of sulfuric phosphoric acid.The step of producing of semi-hydrated gypsum whisker is that drying forms under 120 ℃ temperature with above-mentioned crystal whisker of gypsum suspension filtered, with after the boiling water washing.
Embodiment 3.A kind of method of in phosphoric acid, making crystal whisker of gypsum.It comprises the phosphoric acid leaching liquid produce step, crystal whisker of gypsum suspension produce steps such as producing of step and half water or dehydrated gyp-whisker.To be to use excessive concentration be that 30% phosphoric acid and phosphorus ore leach chemical reaction to the step of producing of phosphoric acid leaching liquid, and controlled temperature is 90 ℃, through 3 hours reaction, tells liquid phase and filtered, and obtains containing H
3PO
43-4mol/L, Ca
2+0.8-1.2mol/L the phosphoric acid leaching liquid.The step of producing of crystal whisker of gypsum suspension is under stirring action, and it is that stirring reaction is 150 minutes under 90 ℃ condition in 30% the sulphuric acid soln that the phosphoric acid leaching liquid is added concentration gradually, generates crystal whisker of gypsum and is suspended in phosphoric acid or the mixture of sulfuric phosphoric acid.The step of producing of semi-hydrated gypsum whisker is that drying forms under 130 ℃ temperature with above-mentioned crystal whisker of gypsum suspension filtered, with after the boiling water washing.
Embodiment 4.A kind of method of in phosphoric acid, making crystal whisker of gypsum.It comprises the phosphoric acid leaching liquid produce step, crystal whisker of gypsum suspension produce steps such as producing of step and half water or dehydrated gyp-whisker.To be to use excessive concentration be that 35% phosphoric acid and phosphorus ore leach chemical reaction to the step of producing of phosphoric acid leaching liquid, and controlled temperature is 90 ℃, through 2 hours reaction, tells liquid phase and filtered, and obtains containing H
3PO
43-4mol/L, Ca
2+0.8-1.2mol/L the phosphoric acid leaching liquid.The step of producing of crystal whisker of gypsum suspension is under stirring action, and it is that stirring reaction is 60 minutes under 95 ℃ condition in 30% the sulphuric acid soln that the phosphoric acid leaching liquid is added concentration gradually, generates crystal whisker of gypsum and is suspended in phosphoric acid or the mixture of sulfuric phosphoric acid.The step of producing of half water or dehydrated gyp-whisker is that drying forms under 120 ℃ temperature with above-mentioned crystal whisker of gypsum suspension filtered, with after the boiling water washing.Embodiment 4 has reduced the generation temperature of whisker, has shortened its growth time greatly, has improved its production efficiency, and production cost then descends significantly.
Embodiment 5.A kind of method of in phosphoric acid, making crystal whisker of gypsum.Get 500 milliliters of 35% phosphoric acid, add lime carbonate 50 grams, stir, dissolving finishes, and filters; Filtrate slowly added in 140 milliliter 35% the sulfuric acid, stirring reaction is 120 minutes under 95 ℃ condition, obtains white depositions, filter, with boiling water washing, drying in the time of 120 ℃, semi-hydrated gypsum whisker 70.0 grams.Crystal whisker of gypsum diameter 2-4 μ m, length 30-150 μ m.
Embodiment 6.A kind of method of in phosphoric acid, making crystal whisker of gypsum.Get homemade phosphorus ore 25 gram of P2O5 31%, CaO 55%, progressively drop in 300 milliliter 35% the phosphoric acid, 90 ℃ down after the reaction 2 hours, filter; Get 250 milliliters of clarified liqs, wherein Ca
2+48 grams per liters, H
3PO
432%, progressively add concentration and be in 100 milliliters of sulfuric acid of 30%, stirring reaction is 2 hours under 90 ℃ condition, obtains white depositions, filter, with boiling water washing, 200 ℃ of dryings, dehydrated gyp-whisker 38 grams.Crystal whisker of gypsum diameter 2-4 μ m, length 50-200 μ m.
Embodiment 7.A kind of method of in phosphoric acid, making crystal whisker of gypsum.Get calcium contents Ca
2+200 milliliters of the solution of 36g/L, phosphoric acid 30% add in 60 milliliter 30% the sulfuric acid, and stirring reaction is 150 minutes under 50-100 ℃ condition, obtains white depositions, filter, with boiling water washing, 120 ℃ of dryings, semi-hydrated gypsum whisker 25 grams.Crystal whisker of gypsum diameter 2-4 μ m, length 30-200 μ m.
Embodiment 1～7 can reduce generation temperature, the shortening growth time of whisker, makes whisker growth neat, and production cost is descended significantly.The crystal whisker of gypsum excellent property that present embodiment is produced, its mechanical property is considerably beyond common gypsum.It has purposes widely: can be used as the enhancing constituent element of materials such as plastics, nylon, urethane, rubber, significantly improve the tensile strength and the Young's modulus of material; In pitch, add crystal whisker of gypsum, can make the bituminous softening temperature improve 10-20 ℃, the performance and the work-ing life of improving pitch articles greatly; Be used for aspects such as light building material, lagging material, coating, paint, difficult combustion paper, can improve plasticity-, the transparency, flame retardant resistance and the printing of paper; The Properties of Friction Materials that contains crystal whisker of gypsum is stable, and frictional coefficient changes between 100-200 ℃ not quite, can replace asbestos production new-type friction material.
Claims (4)
1. method of in phosphoric acid, making crystal whisker of gypsum, it comprises the step of producing of producing step and half water or dehydrated gyp-whisker of producing step, crystal whisker of gypsum suspension of phosphoric acid leaching liquid, it is characterized in that to be to use excessive concentration be that 30～40% phosphoric acid and phosphorus ore leach chemical reaction for the step of producing of phosphoric acid leaching liquid, controlled temperature is 50-95 ℃, reaction through 2-4 hour, tell liquid phase and also filtered, obtain containing H
3PO
43-4mol/L, Ca
2+0.8-1.2mol/L the phosphoric acid leaching liquid; The step of producing of crystal whisker of gypsum suspension is under stirring action, the phosphoric acid leaching liquid is added in the sulphuric acid soln that concentration is 30-35% gradually, stirring reaction is 120～150 minutes under 50～100 ℃ condition, generates crystal whisker of gypsum and is suspended in phosphoric acid or the mixture of sulfuric phosphoric acid; The step of producing of half water or dehydrated gyp-whisker is that drying forms under 120～200 ℃ temperature with above-mentioned crystal whisker of gypsum suspension filtered, with after the boiling water washing.
2. according to the described method of in phosphoric acid, making crystal whisker of gypsum of claim 1, it is characterized in that to be to use excessive concentration be that 35% phosphoric acid and phosphorus ore leach chemical reaction for the step of producing of said phosphoric acid leaching liquid.
3. according to claim 1 or the 2 described methods of in phosphoric acid, making crystal whisker of gypsum, the step of producing that it is characterized in that said crystal whisker of gypsum suspension is under stirring action, the phosphoric acid leaching liquid is added in the sulphuric acid soln that concentration is 30-35% gradually, and stirring reaction is 120～150 minutes under 90～95 ℃ condition.
4. method of in phosphoric acid, making crystal whisker of gypsum, it comprises the step of producing of producing step and half water or dehydrated gyp-whisker of producing step, crystal whisker of gypsum suspension of phosphoric acid leaching liquid, it is characterized in that to be to use excessive concentration be that 35% phosphoric acid and lime carbonate leach chemical reaction for the step of producing of phosphoric acid leaching liquid, stir, tell liquid phase and also filtered, obtain the phosphoric acid leaching liquid; The step of producing of crystal whisker of gypsum suspension is under stirring action, and it is that stirring reaction is 120 minutes under 95 ℃ condition in 35% the sulphuric acid soln that the phosphoric acid leaching liquid is added concentration gradually, generates crystal whisker of gypsum and is suspended in phosphoric acid or the mixture of sulfuric phosphoric acid; The step of producing of half water or dehydrated gyp-whisker is that drying forms under 120 ℃ temperature with above-mentioned crystal whisker of gypsum suspension filtered, with after the boiling water washing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100243480A CN1314840C (en) | 2004-06-14 | 2004-06-14 | Method for producing land plaster whiskers from phosphoric acid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100243480A CN1314840C (en) | 2004-06-14 | 2004-06-14 | Method for producing land plaster whiskers from phosphoric acid |
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| CN1584130A true CN1584130A (en) | 2005-02-23 |
| CN1314840C CN1314840C (en) | 2007-05-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100545324C (en) * | 2007-04-16 | 2009-09-30 | 云南常青树化工有限公司 | The preparation method of a kind of calcium sulfate crystal whiskers and phosphoric acid |
| CN101311355B (en) * | 2008-04-24 | 2012-05-02 | 云南民族大学 | Process for preparing calcium sulphate whiskers from ardealite |
| CN102534801A (en) * | 2012-02-23 | 2012-07-04 | 云南民族大学 | Method for improving quality of calcium sulfate whiskers |
| CN103074667A (en) * | 2013-01-30 | 2013-05-01 | 湘潭大学 | Method for preparing calcium sulfate whisker through recrystallization |
| CN103526277A (en) * | 2012-10-26 | 2014-01-22 | 青岛科技大学 | Method for manufacturing gypsum whisker with hexagonal cross section and low phosphorus content |
| CN103626143A (en) * | 2013-11-29 | 2014-03-12 | 晏明朗 | Method for wet production of phosphoric acid and byproduct, namely white gypsum |
| CN103664011A (en) * | 2013-12-13 | 2014-03-26 | 江苏省一夫新材料科技有限公司 | Cement-based composite material and preparation method thereof |
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| CN104328481A (en) * | 2014-10-14 | 2015-02-04 | 瓮福（集团）有限责任公司 | Method for preparing gypsum whisker by using phosphate tailings and raffinate phosphoric acid |
| CN104528798A (en) * | 2014-12-16 | 2015-04-22 | 中国科学院青海盐湖研究所 | Method for purifying low-grade natural gypsum or gypsum tailings by recrystallization |
| CN105154979A (en) * | 2015-09-18 | 2015-12-16 | 金正大诺泰尔化学有限公司 | Method for producing wet-process phosphoric acid and coproducing alpha-semi-hydrated gypsum whisker and high-purity high-whiteness alpha-semi-hydrated gypsum whisker |
| CN105217590A (en) * | 2015-09-18 | 2016-01-06 | 金正大诺泰尔化学有限公司 | A kind of method of producing phosphoric acid by wet process by-product αsemiwatergypsum and high purity high whiteness αsemiwatergypsum |
| US10745278B2 (en) | 2015-09-18 | 2020-08-18 | Kingenta Ecological Engineering Group Co., Ltd. | Method for producing phosphoric acid and by-producing alpha-hemihydrate gypsum by wet-process |
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| JP2829048B2 (en) * | 1989-09-07 | 1998-11-25 | 富士不燃建材工業株式会社 | Method for producing sparingly soluble hemihydrate gypsum fiber |
| JP3097619B2 (en) * | 1997-10-02 | 2000-10-10 | 日本電気株式会社 | Method of manufacturing field emission cold cathode |
| CN1337369A (en) * | 2000-08-03 | 2002-02-27 | 韩晨光 | Gypsum fiber producing process |
| CN1261624C (en) * | 2003-07-08 | 2006-06-28 | 宁夏建筑材料研究院 | Gypsum whisker, its preparation method and application |
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2004
- 2004-06-14 CN CNB2004100243480A patent/CN1314840C/en not_active Expired - Fee Related
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| CN100545324C (en) * | 2007-04-16 | 2009-09-30 | 云南常青树化工有限公司 | The preparation method of a kind of calcium sulfate crystal whiskers and phosphoric acid |
| CN101311355B (en) * | 2008-04-24 | 2012-05-02 | 云南民族大学 | Process for preparing calcium sulphate whiskers from ardealite |
| CN102534801A (en) * | 2012-02-23 | 2012-07-04 | 云南民族大学 | Method for improving quality of calcium sulfate whiskers |
| CN103526277B (en) * | 2012-10-26 | 2016-05-11 | 青岛科技大学 | A kind of cross section of manufacturing is hexagon and the method with low phosphorus content crystal whisker of gypsum |
| CN103526277A (en) * | 2012-10-26 | 2014-01-22 | 青岛科技大学 | Method for manufacturing gypsum whisker with hexagonal cross section and low phosphorus content |
| CN103074667A (en) * | 2013-01-30 | 2013-05-01 | 湘潭大学 | Method for preparing calcium sulfate whisker through recrystallization |
| CN103074667B (en) * | 2013-01-30 | 2015-06-24 | 湘潭大学 | Method for preparing calcium sulfate whisker through recrystallization |
| CN103626143A (en) * | 2013-11-29 | 2014-03-12 | 晏明朗 | Method for wet production of phosphoric acid and byproduct, namely white gypsum |
| CN103664011A (en) * | 2013-12-13 | 2014-03-26 | 江苏省一夫新材料科技有限公司 | Cement-based composite material and preparation method thereof |
| CN104130646A (en) * | 2014-08-06 | 2014-11-05 | 武汉理工大学 | Infrared reflection thermal insulation coating and preparation method thereof |
| CN104130646B (en) * | 2014-08-06 | 2017-01-11 | 武汉理工大学 | Infrared reflection thermal insulation coating and preparation method thereof |
| CN104328481A (en) * | 2014-10-14 | 2015-02-04 | 瓮福（集团）有限责任公司 | Method for preparing gypsum whisker by using phosphate tailings and raffinate phosphoric acid |
| CN104528798A (en) * | 2014-12-16 | 2015-04-22 | 中国科学院青海盐湖研究所 | Method for purifying low-grade natural gypsum or gypsum tailings by recrystallization |
| CN105217590A (en) * | 2015-09-18 | 2016-01-06 | 金正大诺泰尔化学有限公司 | A kind of method of producing phosphoric acid by wet process by-product αsemiwatergypsum and high purity high whiteness αsemiwatergypsum |
| CN105154979A (en) * | 2015-09-18 | 2015-12-16 | 金正大诺泰尔化学有限公司 | Method for producing wet-process phosphoric acid and coproducing alpha-semi-hydrated gypsum whisker and high-purity high-whiteness alpha-semi-hydrated gypsum whisker |
| CN105217590B (en) * | 2015-09-18 | 2017-05-10 | 金正大诺泰尔化学有限公司 | Method for production of wet process phosphoric acid and byproducts alpha-hemihydrated gypsum and high purity and high whiteness alpha-hemihydrated gypsum |
| US10696552B2 (en) | 2015-09-18 | 2020-06-30 | Kingenta Norsterra Chemical Co., Ltd. | Method for producing wet-process phosphoric acid and by-producing alpha-hemihydrate gypsum and high-purity and high-whiteness alpha-hemihydrate gypsum |
| US10745278B2 (en) | 2015-09-18 | 2020-08-18 | Kingenta Ecological Engineering Group Co., Ltd. | Method for producing phosphoric acid and by-producing alpha-hemihydrate gypsum by wet-process |
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