Method for preparing iron oxide yellow

A technology of iron oxide yellow and solution, applied in iron oxide, iron oxide/iron hydroxide and other directions, can solve problems such as trouble and water pollution, achieve environmental friendliness, simplify production methods, and avoid the impact of iron oxide yellow product quality. Effect

Inactive Publication Date: 2013-04-17
张学政
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, surfactants will generate a lot of foam, which will cause trouble for later washing and cause water pollution

Method used

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  • Method for preparing iron oxide yellow
  • Method for preparing iron oxide yellow
  • Method for preparing iron oxide yellow

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preparation example Construction

[0030] The method for preparing iron oxide yellow of the present invention will be further described below in conjunction with the accompanying drawings.

[0031] figure 1 It is a schematic process flow diagram of the method for preparing iron oxide yellow according to the present invention. First add iron 11 and sulfuric acid 12 into reaction tank 1 to prepare FeSO 4 Solution 13. Then, adjust the prepared FeSO 4 The concentration of the solution 13 reaches the required concentration and is passed into the sedimentation tank 2. At the same time, the NaOH solution 21, the deflocculant 22 and the additive 23 are added to the sedimentation tank 2, and nitrogen gas is passed through to generate hydrogen under stirring conditions. Ferrous oxide slurry. After the reaction in the sedimentation tank 2 finishes, feed air 24 thereinto, as figure 1 shown by the dotted line in . Under stirring conditions, the ferrous hydroxide slurry was oxidized to obtain ferric hydroxide slurry 25...

Embodiment 1

[0033] Prepare FeSO with 0.1mol / L dilute sulfuric acid and iron in reaction tank 1 4 solution, and then the FeSO 4 The concentration of the solution was adjusted to 0.1mol / L. FeSO 4 500ml of the solution and 500ml of the 0.4mol / L NaOH solution are added to the sedimentation tank 2 at the same time, that is, the molar ratio of the actual amount of NaOH used to the amount according to the metering ratio is 2. where FeSO 4 The adding speed of the solution is 5ml / min, and the adding speed of the NaOH solution is 5ml / min. Also add 0.07g tartaric acid, 0.06g ethanol and pass into nitrogen reaction with the flow rate of 5L / min to obtain ferrous hydroxide slurry, after reaction finishes, stop flowing nitrogen. Under the conditions of a temperature of 50° C. and a stirring speed of 800 r / min, air was introduced into the sedimentation tank 2 at a flow rate of 3 L / min to oxidize the prepared ferrous hydroxide slurry. After 1 hour of oxidation, an iron hydroxide slurry was obtained. ...

Embodiment 2

[0036] Prepare FeSO with 1mol / L dilute sulfuric acid and iron in reaction pool 1 4 solution, and then the FeSO 4 The concentration of the solution was adjusted to 0.5mol / L. FeSO 4 Solution 500ml and 1.5L of 1mol / L NaOH solution are added into the sedimentation tank 2 at the same time, that is, the molar ratio of the actual usage amount of NaOH to the amount according to the metering ratio is 3. where FeSO 4 The adding speed of the solution is 3ml / min, and the adding speed of the NaOH solution is 9ml / min. Also add 0.4g sodium dihydrogen phosphate, 0.4g polyethylene glycol and pass into nitrogen reaction with the flow rate of 5L / min to obtain ferrous hydroxide slurry, after the reaction finishes, stop passing through nitrogen. Under the conditions of a temperature of 50° C. and a stirring speed of 900 r / min, air was introduced into the sedimentation tank 2 at a flow rate of 3.5 L / min to oxidize the prepared ferrous hydroxide slurry. After 2 hours of oxidation, an iron hydro...

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Abstract

The invention relates to a method for preparing iron oxide yellow, which comprises the following steps: step 1: using sulfuric acid to react with iron in a reaction tank to prepare an FeSO4 solution; step 2: under the condition of stirring, adding the FeSO4 solution prepared in the step 1 as well as an NaO solution and a deflocculant solution into a sedimentation tank simultaneously to prepare a ferrous hydroxide sizing agent; step 3: under the condition of stirring, leading air in the sedimentation tank to oxidize the ferrous hydroxide sizing agent prepared in the step 2 to obtain a ferric hydroxide sizing agent; and step 4: washing, filtering, drying and grinding the ferric hydroxide sizing agent prepared in the step 3 to obtain the iron oxide yellow product. According to the invention, the method is simpler, is more environment-friendly, and the spherical iron oxide yellow can be prepared.

Description

technical field [0001] The invention relates to a method for preparing iron oxide yellow, more specifically, relates to a method for preparing spherical transparent iron oxide yellow. Background technique [0002] Transparent iron oxide yellow is one of the iron oxide pigments with an average particle size of less than 0.1 μm, and its chemical formula is α-FeOOH. Transparent iron oxide yellow has some unique properties: when light is projected onto the coating containing transparent iron oxide yellow pigment, transmission and diffraction phenomena will occur, so that the coating appears transparent and lustrous, and the coating can also strongly absorb ultraviolet rays , to protect UV-sensitive substances. In particular, spherical iron oxide yellow is more popular in use because of its uniform properties and no color difference, the quality of the final pigment will be more stable and the color will be brighter. [0003] At present, some manufacturers at home and abroad ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
Inventor 张学政
Owner 张学政
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