CN105527286A - Determining method for effective bentonite in casting wet molding sand - Google Patents
Determining method for effective bentonite in casting wet molding sand Download PDFInfo
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- CN105527286A CN105527286A CN201410506538.XA CN201410506538A CN105527286A CN 105527286 A CN105527286 A CN 105527286A CN 201410506538 A CN201410506538 A CN 201410506538A CN 105527286 A CN105527286 A CN 105527286A
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Abstract
The present invention discloses a determining method for effective bentonite in casting wet molding sand. The determining method comprises: a sample drying treatment: drying a bentonite sample to achieve a constant weight; a sample weighing step: weighing 0.2 g of bentonite, placing in a conical flask, adding 50 ml of distilled water to the conical flask, and after the bentonite is completely wetted, adding 10 ml of a sodium pyrophosphate solution with a concentration of 2% to the conical flask; a sample heating treatment: uniformly shaking the mixing liquid in the conical flask, and carrying out heating boiling for 6-10 min on an electric furnace; and a determining step: cooling the mixing liquid in the conical flask in air to achieve a room temperature, and adding a methylene blue solution with a concentration of 2% in a dropwise manner by using a burette, wherein during the titration, the 3/4 predicted amount of the methylene blue solution is firstly added, and then 1-2 ml of the methylene blue solution is added every time until achieving the test end point. The determining method of the present invention has characteristics of time saving, accurate determining result, determining reagent use amount saving, and rapid determination.
Description
Technical field
The present invention relates to a kind of effective bentonitic assay method, particularly relate to effective swelling in a kind of casting green-sand
The assay method of soil.
Background technology
At present, in national standard Law, the effective bentonitic assay method of casting green-sand is adopt " inquartation " or sample spliter, sample from the old sand added before mulling, then demarcating steps is carried out, first (1) between picking up the car roughing sand used and bentonitic clay dry after constant weight at 105 ~ 110 DEG C, be placed in the triangular flask of one group 5 250 milliliters, add respectively bentonitic clay 0.1,
0.2,0.3,0.4,0.5 gram and roughing sand 4.9,4.8,4.7,4.6,4.5 grams, make every part of roughing sand and bentonitic clay total amount be 5.0 grams; (2) first add the distilled water of 50 milliliters respectively, after to be moistened, add the sodium pyrophosphate solution 20 milliliters that concentration is 1% respectively, to rock evenly heating on electric furnace and boil 5 minutes.Be cooled to room temperature in atmosphere.(3) instill with buret the methylene blue solution that concentration is 0.2% respectively, during titration, first time adds about 2/3rds of the blue solution titer of the sub-potassium base of expectation, drips 1 ~ 2 milliliter, until check terminal later at every turn.
The method of inspection terminal is after the blue solution of the sub-potassium base of each dropping, rocks 30 seconds, is stained with a solution on middling speed quantitative filter paper with glass bar, observe around central pale blue color dot with or without light blue halo, if end occurs, continue to drip the blue solution of methylene potassium base, repeatable operation.When there is light blue halo, test solution being left standstill 2 minutes, then is stained with a test solution with glass bar, if the light blue halo of surrounding disappears, illustrate that end is to terminal, the blue solution of sub-potassium base should be dripped again, till there is light blue halo, be test endpoint;
The titer of the blue solution of sub-potassium base is now the Absorbance ratio-derivative method of sample.The Absorbance ratio-derivative method of each sample gets identical sample replication three times as stated above, obtains mean value; But when the arbitrary numerical value in three numerical value and average value are more than 10%, test need re-start.With bentonitic clay addition in sample for horizontal ordinate, the mean value of three blue solution titers of sub-potassium base is ordinate, drawing standard curve.
As can be seen here, national standard Law assay method is complicated, and variable factor impact is comparatively large, the effective bentonitic clay amount not easily in Fast Measurement casting green-sand.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, effective bentonitic assay method in a kind of casting green-sand be provided, comprise the following steps:
1) samples dried process: by bentonitic clay sample drying to constant weight;
2) sample takes step: take the bentonitic clay of 0.2g and be positioned in conical flask, adding the distilled water of 50 milliliters in conical flask, after profit soil complete wetting to be painted, adds the sodium pyrophosphate solution 10 milliliters that concentration is 2% in conical flask;
3) sample heats: the mixing material in conical flask to be rocked evenly heating on electric furnace and boil 6-10 minute minute;
4) determination step: the mixing material in above-mentioned conical flask is cooled to room temperature in atmosphere, instilling concentration with buret is the methylene blue solution of 0.2%, add first during titration and estimate 3/4ths of the blue solution titer of sub-potassium base, later each dropping 1 ~ 2 milliliter, until inspection terminal.
Further, in described cubage step, effective bentonitic computing method are titer ml/ bentonitic clay sucking amount ml × 0.2g/5g × 100% of the blue solution of effective bentonitic clay %=sand sample Central Asia potassium base.
Further, drip 1 ~ 1.5 milliliter of sub-potassium base indigo plant solution after adding 2/3rds steps estimating the blue solution titer of sub-potassium base during described titration for the first time at every turn.
Further, described bentonitic clay oven dry is 110 DEG C to the temperature of constant weight.
Further, described in treat that test sample determination step is take to dry the sand sample 5.0 grams of constant weight through 110 DEG C, be placed in the triangular flask of 250 milliliters according to state
Target assay method measures.
Further, in step 1) be through 105 ~ 110 DEG C by bentonitic clay sample drying to constant weight.
Further, the method for described inspection terminal is after the blue solution of the sub-potassium base of each dropping, rocks 30 seconds, is stained with a mixed solution on middling speed quantitative filter paper with glass bar, observe, until be test endpoint when there is light blue halo.
Further, also comprise sampling, demarcate and cubage step, described assay method carries out after demarcating steps.
Beneficial effect of the present invention: convenient and time-saving, measurement result is accurate, saves the using amount of reagent of mensuration, is convenient to Fast Measurement.
Embodiment
For making the object of the embodiment of the present invention and technical scheme clearly, the technical scheme below in conjunction with embodiment is clearly and completely described.Obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on described embodiments of the invention, the every other embodiment that those of ordinary skill in the art obtain under without the need to the prerequisite of creative work, all belongs to the scope of protection of the invention.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
The implication of the "and/or" described in the present invention refers to respective individualism or both simultaneous situations include interior.
The implication of " inside and outside " described in the present invention refers to relative to equipment itself, in the direction of sensing equipment inside is, otherwise is outward, but not the specific restriction to equipment mechanism of the present invention.
The indirect connection that can be the direct connection between parts also can be by other parts between parts of the implication of " connection " described in the present invention.
Embodiment one:
The invention provides effective bentonitic assay method in a kind of casting green-sand, comprise the following steps:
1) samples dried process: under 100 ~ 105 DEG C of temperature environments by bentonitic clay sample drying to constant weight;
2) sample takes step: take the bentonitic clay of 0.2g and be positioned in conical flask, adding the distilled water of 50 milliliters in conical flask, after profit soil complete wetting to be painted, adds the sodium pyrophosphate solution 10 milliliters that concentration is 2% in conical flask;
3) sample heats: the mixing material in conical flask to be rocked evenly heating on electric furnace and boil 6-10 minute minute;
4) determination step: the mixing material in above-mentioned conical flask is cooled to room temperature in atmosphere, instilling concentration with buret is the methylene blue solution of 0.2%, add first during titration and estimate 3/4ths of the blue solution titer of sub-potassium base, later each dropping 1 ~ 2 milliliter, until inspection terminal.
Also comprise sampling, demarcate and cubage step, described assay method carries out after demarcating steps.The method of described inspection terminal is after the blue solution of the sub-potassium base of each dropping, rocks 30 seconds, is stained with a mixed solution on middling speed quantitative filter paper with glass bar, observe, until be test endpoint when there is light blue halo.
In described cubage step, effective bentonitic computing method are titer ml/ bentonitic clay sucking amount ml × 0.2g/5g × 100% of the blue solution of effective bentonitic clay %=sand sample Central Asia potassium base.
Drip 1 ~ 1.5 milliliter of sub-potassium base indigo plant solution after adding 2/3rds steps estimating the blue solution titer of sub-potassium base for the first time during described titration at every turn.Described bentonitic clay oven dry is 110 DEG C to the temperature of constant weight.Describedly treat that test sample determination step is take to dry the sand sample 5.0 grams of constant weight through 110 DEG C, the triangular flask being placed in 250 milliliters measures according to the assay method of GB.
Embodiment two:
The invention provides effective bentonitic assay method in a kind of casting green-sand, comprise the following steps:
1) samples dried process: under 105 ~ 110 DEG C of temperature environments by bentonitic clay sample drying to constant weight;
2) sample takes step: take the bentonitic clay of 0.2g and be positioned in conical flask, adding the distilled water of 50 milliliters in conical flask, after profit soil complete wetting to be painted, adds the sodium pyrophosphate solution 20 milliliters that concentration is 1% in conical flask;
3) sample heats: the mixing material in conical flask to be rocked evenly heating on electric furnace and boil 6-10 minute minute;
4) determination step: the mixing material in above-mentioned conical flask is cooled to room temperature in atmosphere, instilling concentration with buret is the methylene blue solution of 0.2%, add first during titration and estimate 3/4ths of the blue solution titer of sub-potassium base, later each dropping 1 ~ 2 milliliter, until inspection terminal.
Also comprise sampling, demarcate and cubage step, described assay method carries out after demarcating steps.The method of described inspection terminal is after the blue solution of the sub-potassium base of each dropping, rocks 30 seconds, is stained with a mixed solution on middling speed quantitative filter paper with glass bar, observe, until be test endpoint when there is light blue halo.
In described cubage step, effective bentonitic computing method are titer ml/ bentonitic clay sucking amount ml × 0.2g/5g × 100% of the blue solution of effective bentonitic clay %=sand sample Central Asia potassium base.
Drip 1 ~ 1.5 milliliter of sub-potassium base indigo plant solution after adding 3/4ths steps estimating the blue solution titer of sub-potassium base for the first time during described titration at every turn.Described bentonitic clay oven dry is 110 DEG C to the temperature of constant weight.Describedly treat that test sample determination step is take to dry the sand sample 5.0 grams of constant weight through 110 DEG C, the triangular flask being placed in 250 milliliters measures according to the assay method of GB.
Embodiment three:
The invention provides effective bentonitic assay method in a kind of casting green-sand, comprise the following steps:
1) samples dried process: under 105 ~ 110 DEG C of temperature environments by bentonitic clay sample drying to constant weight;
2) sample takes step: take the bentonitic clay of 0.2g and be positioned in conical flask, adding the distilled water of 50 milliliters in conical flask, after profit soil complete wetting to be painted, adds the sodium pyrophosphate solution 20 milliliters that concentration is 1% in conical flask;
3) sample heats: the mixing material in conical flask to be rocked evenly heating on electric furnace and boil 6-10 minute minute;
4) determination step: the mixing material in above-mentioned conical flask is cooled to room temperature in atmosphere, instilling concentration with buret is the methylene blue solution of 0.2%, add first during titration and estimate 2/3rds of the blue solution titer of sub-potassium base, later each dropping 1 ~ 2 milliliter, until inspection terminal.
Also comprise sampling, demarcate and cubage step, described assay method carries out after demarcating steps.The method of described inspection terminal is after the blue solution of the sub-potassium base of each dropping, rocks 30 seconds, is stained with a mixed solution on middling speed quantitative filter paper with glass bar, observe, until be test endpoint when there is light blue halo.
In described cubage step, effective bentonitic computing method are titer ml/ bentonitic clay sucking amount ml × 0.2g/5g × 100% of the blue solution of effective bentonitic clay %=sand sample Central Asia potassium base.
Drip 1 ~ 1.5 milliliter of sub-potassium base indigo plant solution after adding 2/3rds steps estimating the blue solution titer of sub-potassium base for the first time during described titration at every turn.Described bentonitic clay oven dry is 110 DEG C to the temperature of constant weight.Describedly treat that test sample determination step is take to dry the sand sample 5.0 grams of constant weight through 110 DEG C, the triangular flask being placed in 250 milliliters measures according to the assay method of GB.
These are only embodiments of the present invention, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (8)
1. an effective bentonitic assay method in casting green-sand, is characterized in that, comprise the following steps:
Samples dried process: by bentonitic clay sample drying to constant weight;
Sample takes step: take the bentonitic clay of 0.2g and be positioned in conical flask, adding the distilled water of 50 milliliters in conical flask, after profit soil complete wetting to be painted, adds the sodium pyrophosphate solution 10 milliliters that concentration is 2% in conical flask;
Sample heats: the mixing material in conical flask to be rocked evenly heating on electric furnace and boil 6-10 minute minute;
Determination step: the mixing material in above-mentioned conical flask is cooled to room temperature in atmosphere, instilling concentration with buret is the methylene blue solution of 0.2%, add first during titration and estimate 3/4ths of the blue solution titer of sub-potassium base, later each dropping 1 ~ 2 milliliter, until inspection terminal.
2. effective bentonitic assay method in casting green-sand according to claim 1, is characterized in that: in described cubage step, effective bentonitic computing method are titer ml/ bentonitic clay sucking amount ml × 0.2g/5g × 100% of the blue solution of effective bentonitic clay %=sand sample Central Asia potassium base.
3. effective bentonitic assay method in casting green-sand according to claim 1, is characterized in that: drip 1 ~ 1.5 milliliter of sub-potassium base indigo plant solution after adding 2/3rds steps estimating the blue solution titer of sub-potassium base for the first time during described titration at every turn.
4. effective bentonitic assay method in casting green-sand according to claim 1, is characterized in that: described bentonitic clay oven dry is 110 DEG C to the temperature of constant weight.
5. effective bentonitic assay method in casting green-sand according to claim 1, is characterized in that: described in treat that test sample determination step is take to dry the sand sample 5.0 grams of constant weight through 110 DEG C, be placed in the triangular flask of 250 milliliters according to state
Target assay method measures.
6. effective bentonitic assay method in casting green-sand according to claim 1, is characterized in that: in step 1) be through 105 ~ 110 DEG C by bentonitic clay sample drying to constant weight.
7. effective bentonitic assay method in casting green-sand according to claim 1, it is characterized in that: the method for described inspection terminal is for after the blue solution of the sub-potassium base of each dropping, rock 30 seconds, a mixed solution is stained with on middling speed quantitative filter paper with glass bar, observe, until be test endpoint when there is light blue halo.
8. effective bentonitic assay method in casting green-sand according to claim 1, is characterized in that: also comprise sampling, demarcate and cubage step, described assay method carries out after demarcating steps.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101500959A (en) * | 2006-10-20 | 2009-08-05 | 巴西南扩科有限公司 | Additivated sodic bentonite for use in composition of green sand for molding of cast parts |
| CN101806747A (en) * | 2010-03-05 | 2010-08-18 | 华中科技大学 | Methylene blue adsorption testing method of bentonite |
| CN103567359A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Clay green sand for high-pressure molding and preparation method thereof |
| CN104007106A (en) * | 2014-06-24 | 2014-08-27 | 江苏力源金河铸造有限公司 | Method for determining effective bentonite in green sand for casting |
-
2014
- 2014-09-28 CN CN201410506538.XA patent/CN105527286A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101500959A (en) * | 2006-10-20 | 2009-08-05 | 巴西南扩科有限公司 | Additivated sodic bentonite for use in composition of green sand for molding of cast parts |
| CN101806747A (en) * | 2010-03-05 | 2010-08-18 | 华中科技大学 | Methylene blue adsorption testing method of bentonite |
| CN103567359A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Clay green sand for high-pressure molding and preparation method thereof |
| CN104007106A (en) * | 2014-06-24 | 2014-08-27 | 江苏力源金河铸造有限公司 | Method for determining effective bentonite in green sand for casting |
Non-Patent Citations (3)
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| 于震宗: ""湿型砂原材料质量测定方法"", 《现代铸铁》 * |
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Application publication date: 20160427 |