CN1172027C - Process for removing Si and Al from solution of ferrous chloride - Google Patents
Process for removing Si and Al from solution of ferrous chloride Download PDFInfo
- Publication number
- CN1172027C CN1172027C CNB001332813A CN00133281A CN1172027C CN 1172027 C CN1172027 C CN 1172027C CN B001332813 A CNB001332813 A CN B001332813A CN 00133281 A CN00133281 A CN 00133281A CN 1172027 C CN1172027 C CN 1172027C
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- silicon
- solution
- aluminum
- ferrous chloride
- hydrochloric acid
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Abstract
The present invention relates to a method for separating silicon and aluminium from hydrochloric acid solution in which FeCl2 is used as the main component. Waste liquid of hydrochloric acid pickling, which is generated in the acid washing technology of a cold-rolled sheet is generally processed by a Lutz method invented by an Austrian person so as to obtain regenerating hydrochloric acid and ferric oxide, but the using value of the Lutz method is influenced because ferric oxide comprises more impurities, such as, silicon, aluminum, etc. In order to improve the economic benefit of products and meet the requirements of ferric oxide of ferrite manufacturers, ammonia water is used for neutralizing ferrous chloride solution untile the pH value of the solution is from 4 to 6 in the present invention. At the time, silicon, aluminum and Fe(OH)2 deposit and are precipitated together. By filtering, separation and removement, mother liquid is sprayed and roasted so high-purity rerric oxide is obtained; the silicon content and the aluminum content can be less than 0.01%.
Description
Technical Field
The invention discloses a method for removing silicon and aluminum in ferrous chloride solution, and relates to treatment of ferric chloride hydrochloric acid solution generated in a cold-rolled sheet pickling process in the metallurgical industry.
Background
The Rutzner method invented by Austria Rutzner company solves the principle of the method, and is to spray and roast ferrous chloride solution to decompose ferrous chloride, chlorine is absorbed by water to be regenerated hydrochloric acid, and iron is oxidized to be ferric oxide, which becomes a by-product.
Its disadvantages, recoveryThe iron oxide has more impurities and low use value. For this reason, the technique of removing silicon in ferrous chloride solution was invented by the company Reultaneus Rotzner in the eighties and patented in 1984 (Austria patent No. 380675), which is characterized in that ammonia was added to ferrous chloride solution to produce a small amount of Fe (OH)2Precipitating, and adding insoluble electrode to the solution of Fe (OH)2Oxidation to Fe (OH)3Reacting silicic acid with Fe (OH)3Precipitating together, filtering and separating, and spray roasting the filtrate to obtain the iron oxide powder without silicon.
However, the silicon removal efficiency of the technology is not high, when the ferrous chloride solution contains high silicon, the silicon content of the product ferric oxide exceeds the standard, and the technology is complex, long in time and high in cost, and is not suitable for industrial mass production.
At present, a reliable method for removing aluminum which is another harmful impurity in the iron oxide does not exist. Practice proves that the use value of the iron oxide can be improved only when the silicon and the aluminum are removed together.
Disclosure of Invention
The invention aims to provide a method for removing silicon and aluminum in a ferrous chloride solution.
The technological scheme of the present invention is that waste cold rolled sheet or iron filings are first used to eliminate residual acid in ferrous chloride solution, and then ammonia water is added to regulate the pH value in ferrous chloride solution to 4-6 to make silicon ion produce ferric silicatePrecipitation, the aluminium ions form aluminium hydroxide precipitates, and Fe (OH) is formed2Precipitating the precipitates together, filtering and separating the precipitates, and carrying out spray roasting on the filtrate to obtain a high-purity iron oxide red powder product.
The principle of the method is as follows:
(1)
(2)
(3)
(4)
or:
the invention has the beneficial effects that: for with FeCl2A method for separating silicon and aluminum from hydrochloric acid solution as main components. The waste hydrochloric acid pickling liquid generated in the cold-rolled sheet pickling process is generally treated by the Rutzner method invented by Oddi to obtain regenerated hydrochloric acid and ferric oxide. However, the iron oxide contains more impurities such as silicon, aluminum and the like, the use value of the iron oxide is influenced, in order to improve the economic benefit of the product and meet the requirement of ferrite manufacturers on the iron oxide, the invention adopts ammonia water to neutralize the ferrous chloride solution until the pH value of the solution is 4-6, and at the moment, the silicon, the aluminum and the Fe (OH)2Precipitating, filtering, separating and removing, and spray roasting the mother liquor to obtain the high-purity ferric oxide. The method is simple, low in cost and stable in quality.
Drawings
The attached drawing is a process flow chart
Detailed Description
Example 1
Adding the waste cold-rolled sheet into a hydrochloric acid pickling solution tank, heating to 40-60 ℃, until residual acid in the solution is consumed, pumping the solution to a neutralization precipitation tank, starting a stirrer, slowly adding ammonia water until the pH value of the solution reaches 4-6, stopping adding the solution, separating the liquid slurry by using a filter press to remove filter cakes, and discarding filtrate, namely mother liquor after silicon and aluminum are removed, inputting the mother liquor into a roasting furnace for spray roasting, thus obtaining the high-purity iron oxide powder.
Claims (1)
1. A process for removing Si and Al elements from ferrous chloride solution includes such steps as removing residual acid from ferrous chloride solution by cold-rolled waste sheet or iron filings, regulating pH value to 4-6 by adding ammonia water to make Si ions generate iron silicate deposit and Al ions generate aluminium hydroxide deposit, andand Fe (OH) which has been formed2Precipitating the precipitates together, filtering and separating the precipitates, and carrying out spray roasting on the filtrate to obtain a high-purity iron oxide red powder product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001332813A CN1172027C (en) | 2000-11-30 | 2000-11-30 | Process for removing Si and Al from solution of ferrous chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001332813A CN1172027C (en) | 2000-11-30 | 2000-11-30 | Process for removing Si and Al from solution of ferrous chloride |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1356406A CN1356406A (en) | 2002-07-03 |
| CN1172027C true CN1172027C (en) | 2004-10-20 |
Family
ID=4595619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001332813A Expired - Lifetime CN1172027C (en) | 2000-11-30 | 2000-11-30 | Process for removing Si and Al from solution of ferrous chloride |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1172027C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100434355C (en) * | 2005-05-20 | 2008-11-19 | 鞍钢股份有限公司 | Waste hydrochloric acid regeneration and silicon removing process and device |
| CN100430521C (en) * | 2006-04-28 | 2008-11-05 | 中冶南方工程技术有限公司 | Purification treatment process of waste liquor of hydrochloric acid |
| CN103643244A (en) * | 2013-11-27 | 2014-03-19 | 昆明理工大学 | Method for treatment of pickling waste liquor by microwave spray roasting |
| CN104118974A (en) * | 2014-06-20 | 2014-10-29 | 马鞍山市华清环保工程有限公司 | Method for treating silicon sludge obtained by neutralizing steel pickling waste liquid, removing silicon and filtering |
| CN110304661A (en) * | 2019-06-20 | 2019-10-08 | 李柏丛 | Soft magnetic ferrite high-performance iron oxide new preparation process |
| CN114275924A (en) * | 2021-07-14 | 2022-04-05 | 湖南省煤炭科学研究院有限公司 | Method for treating and recycling acid mine wastewater |
-
2000
- 2000-11-30 CN CNB001332813A patent/CN1172027C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1356406A (en) | 2002-07-03 |
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