CN102502866B - Washing method for obtaining iron oxide yellow pigment with high pH value - Google Patents
Washing method for obtaining iron oxide yellow pigment with high pH value Download PDFInfo
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- CN102502866B CN102502866B CN201110305707XA CN201110305707A CN102502866B CN 102502866 B CN102502866 B CN 102502866B CN 201110305707X A CN201110305707X A CN 201110305707XA CN 201110305707 A CN201110305707 A CN 201110305707A CN 102502866 B CN102502866 B CN 102502866B
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Abstract
The invention relates to a washing method for obtaining iron oxide yellow pigment with high pH value. The washing method comprises the steps of: (1) water washing: washing filter cake obtained after dewatering by a pressure filter with water until Fe<2+> molar concentration in washing water is lower than 9*10<-6> mol/L; and (2) base liquid washing: washing the filter cake in the pressure filter with a strong base and weak acid salt with OH<-> molar concentration of 1*10<-5>-1*10<-6> mol/L until H<+> molar concentration in the washing liquid is lower than 1*10<-5>. According to the invention, the base liquid washing step is increased, thus the iron oxide yellow product with high pH value is obtained, the consumption of washing water is effectively reduced, the production cost is lowered, the washing time is shortened and the labor production efficiency is improved; and the pH value of the iron oxide yellow product can be conveniently adjusted by controlling the base liquid concentration or base liquid amount, and the washing method has the advantage of convenience for operation.
Description
Technical field
The present invention relates to the washing methods of ferric oxide yellow pigment prepared by a kind of ferrous sulfate method.
Background technology
In iron oxide pigment country inspecting standard, stipulate, the pH value of finished product iron oxide yellow must be greater than 3.5.In the iron oxide pigment industry, most purchasers are slightly higher to the requirement of iron oxide yellow product pH value, and the pH value of general requirement product is 4, and the requirement of this kind of pH value can reach by conventional clear water washing.But, along with iron oxide pigment market improves constantly (more than 5, even reach neutral) to the requirement of iron oxide yellow product pH value, use the conventional washing methods of clear water washing just can not meet production requirement.
In the actual production of iron oxide pigment, adopt clear water to be washed the iron oxide yellow filter cake, when the pH of filter cake value reaches 4.0 left and right, continue again to use clear water to be washed, the pH value of filter cake also is difficult to raise reach more than 5.0, and washing time is longer, the washing water large usage quantity, so not only cause the exorbitant expenditure of washing water, and reduce production efficiency.
Summary of the invention
The objective of the invention is for the deficiencies in the prior art part, a kind of washing methods that obtains high pH value ferric oxide yellow pigment is provided, not only can effectively improves the pH value of product, and can save washing water, reduce production costs, can also improve detersive efficiency.
For achieving the above object, the present invention includes following steps:
(1) water washing, water is to the filter cake washing after pressure filter dehydration, until Fe in washing water
2+volumetric molar concentration lower than 9 * 10
-6mol/L;
(2) alkali liquid washing, with containing OH
-volumetric molar concentration is 1 * 10
-5～1 * 10
-6the strong base weak acid salts solution of mol/L is washed the filter cake in pressure filter, until H in the washing washings
+volumetric molar concentration is lower than 1 * 10
-5till mol/L.
When water washing to Fe in washing water
2+volumetric molar concentration 9 * 10
-6during mol/L, iron oxide yellow product pH value is about at 4 o'clock, then it is limited to wash the rising of iron oxide yellow product pH value with water, not only consumes a large amount of washing water, and washing time reaches product P H value more than 5 long also being difficult to.Therefore, Fe in washing water
2+volumetric molar concentration lower than 9 * 10
-6during mol/L, use alkali liquid washing, utilize acid-base neutralisation, further improve iron oxide yellow product pH value.
Described strong base-weak acid salt can adopt the one or more combination thing in sodium carbonate, sodium bicarbonate or bicarbonate of ammonia.
Fe in washing water in step (1)
2+volumetric molar concentration lower than 8 * 10
-6mol/L is better, can prevent Fe
2+with OH
-form the hydroxide iron precipitate and affect the quality of iron oxide yellow product.
The OH of strong base weak acid salts solution in step (2)
-volumetric molar concentration is 1 * 10
-5mol/L is better, iron oxide yellow product pH value can be increased to more than 5, even reaches neutral, can save the neutralizing treatment time again, enhances productivity.
As shown from the above technical solution, the present invention by increasing by one alkali liquid washing step after water wash step, not only can obtain higher pH value iron oxide yellow product, improve the adaptability of product, and can effectively save the consumption of washing water, reduce production costs, can also the contracting washing time, improve labor productivity; And the pH value that can regulate easily the iron oxide yellow product by controlling concentration of lye or alkali lye amount, have advantages of easy to operate.
Embodiment
Washing step of the present invention is as follows:
(1) water washing.Filter cake washing after water dewaters to pressure filter, until Fe in the washing water of being discharged by pressure filter
2+volumetric molar concentration be 9 * 10
-6mol/L, preferably lower than 8 * 10
-6mol/L, can prevent Fe
2+with OH
-form the ferrous hydroxide precipitation and affect the quality of iron oxide yellow product.
(2) alkali liquid washing.With containing OH
-volumetric molar concentration is 1 * 10
-5～1 * 10
-6the strong base weak acid salts solution of mol/L mol/L is washed the filter cake in pressure filter, until H in the washing washings
+volumetric molar concentration is lower than 1 * 10
-5till mol/L.The OH of strong base weak acid salts solution
-volumetric molar concentration is 1 * 10
-5mol/L is better, not only iron oxide yellow product pH value can be increased to more than 5, even reaches neutral, and can save the neutralizing treatment time again, enhances productivity.
Strong base-weak acid salt in step (2) can adopt the one or more combination thing in sodium carbonate, sodium bicarbonate or bicarbonate of ammonia, and its washing effect sees the following form:
From above effect comparison table: strong base-weak acid salt of the same race, concentration is 1 * 10
-5mol/L or 1 * 10
-6during mol/L, after washing, product P H value can meet the requirement more than 5, but concentration is 1 * 10
-5during mol/L, not only pH value is also relatively high, and washing time used is shorter, can enhance productivity.
Claims (4)
1. a washing methods that obtains high pH value ferric oxide yellow pigment comprises the following steps:
(1) water washing, water is to the filter cake washing after pressure filter dehydration, until Fe in washing water
2+volumetric molar concentration lower than 9 * 10
-6mol/L;
(2) alkali liquid washing, with containing OH
-volumetric molar concentration is 1 * 10
-5～1 * 10
-6the strong base weak acid salts solution of mol/L is washed the filter cake in pressure filter, until H in the washing washings
+volumetric molar concentration is lower than 1 * 10
-5till mol/L.
2. a kind of washing methods that obtains high pH value ferric oxide yellow pigment according to claim 1, it is characterized in that: described strong base-weak acid salt is the one or more combination thing in sodium carbonate, sodium bicarbonate or bicarbonate of ammonia.
3. a kind of washing methods that obtains high pH value ferric oxide yellow pigment according to claim 1 and 2, is characterized in that: Fe in the washing water in step (1)
2+volumetric molar concentration lower than 8 * 10
-6mol/L.
4. a kind of washing methods that obtains high pH value ferric oxide yellow pigment according to claim 1 and 2, is characterized in that: the OH of strong base weak acid salts solution in step (2)
-volumetric molar concentration is 1 * 10
-5mol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110305707XA CN102502866B (en) | 2011-10-11 | 2011-10-11 | Washing method for obtaining iron oxide yellow pigment with high pH value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110305707XA CN102502866B (en) | 2011-10-11 | 2011-10-11 | Washing method for obtaining iron oxide yellow pigment with high pH value |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102502866A CN102502866A (en) | 2012-06-20 |
| CN102502866B true CN102502866B (en) | 2013-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110305707XA Active CN102502866B (en) | 2011-10-11 | 2011-10-11 | Washing method for obtaining iron oxide yellow pigment with high pH value |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108892178A (en) * | 2018-07-24 | 2018-11-27 | 江苏宇星工贸有限公司 | A method of producing the ultralow hydrotrope high pH iron oxide pigment simultaneously |
| CN109095505A (en) * | 2018-07-24 | 2018-12-28 | 江苏宇星工贸有限公司 | A method of producing high pH iron oxide pigment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1386710A (en) * | 2001-05-21 | 2002-12-25 | 邵建华 | Process for preparing superfine iron oxide |
| CN1506309A (en) * | 2002-12-13 | 2004-06-23 | 中国石油天然气股份有限公司 | Process of preparing zeolite molecular sieve with high activity and high stability |
-
2011
- 2011-10-11 CN CN201110305707XA patent/CN102502866B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1386710A (en) * | 2001-05-21 | 2002-12-25 | 邵建华 | Process for preparing superfine iron oxide |
| CN1506309A (en) * | 2002-12-13 | 2004-06-23 | 中国石油天然气股份有限公司 | Process of preparing zeolite molecular sieve with high activity and high stability |
Non-Patent Citations (2)
| Title |
|---|
| 碱法铁黄洗涤工艺的研究;阴子健等;《磁记录材料》;19971231(第1（1997）期);第21、30-32页 * |
| 阴子健等.碱法铁黄洗涤工艺的研究.《磁记录材料》.1997,(第1（1997）期),第21、30-32页. |
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|---|---|
| CN102502866A (en) | 2012-06-20 |
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