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Process for preparing nano calcium sulfate

A nano-calcium sulfate and preparation process technology, applied in the field of preparation of nano-calcium sulfate, can solve the problems of low added value, incapable of industrial production, and high cost, and achieve the effect of reducing the preparation cost and reducing the preparation cost

Inactive Publication Date: 2011-11-09
陈胜明
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Problems solved by technology

[0002] The main problem of using ferrous sulfate to prepare iron oxide series pigments is that a large amount of industrial alkali is used to neutralize the acid in the process, and the ammonium sulfate formed is difficult to recycle and has low added value, which makes the production cost high and cannot be industrialized.
[0003] Ammonium sulfate and lime are used to react the ammonia in the recovery system to realize the recycling of ammonia, and the gypsum calcium sulfate formed has little use value.

Method used

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Embodiment Construction

[0031] Raw materials for preparation: the concentration of ammonium sulfate solution from the iron oxide pigment preparation process is 25%; industrial lime calcium oxide, the calcium oxide content is greater than 95%.

[0032] 1. Take 210 kg of calcium oxide, add 80°C hot water, and prepare 1333 kg of calcium hydroxide emulsion with a calcium oxide content of 15%.

[0033] 2. Filter with a 200-mesh sieve to separate the coarse particles of impurities in the calcium hydroxide emulsion to obtain a refined calcium hydroxide emulsion.

[0034] 3. Take the anti-variable agent sodium stearate with an amount of 3% calcium oxide and mix it with the calcium oxide slurry to obtain a mixed slurry system containing the anti-variable agent.

[0035] 4. Take 1886 kilograms of ammonium sulfate solution with a concentration of 25%, add it into the calcium hydroxide slurry containing the resistance variable agent, stir at room temperature for 2 hours, and the reaction is completed to obtain n...

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Abstract

The invention discloses a process for preparing nano calcium sulfate by adopting lime and ammonium sulfate as raw materials. The preparation process comprises the following steps of: emulsification of lime calcium oxide; generation of nano calcium sulfate slurry by reacting a calcium hydroxide emulsion containing a change-inhibiting agent with an ammonium sulfate solution; filtering and washing; drying; and the like. The process is suitable for ammonium sulfate solution reclamation and ammonia recycling treatment in a process of producing ferric oxide series pigments by adopting ferrous sulfate as a raw material, and is a critical core technology of the process of preparing the ferric oxide series pigments by using the ferrous sulfate as the raw material. The change-inhibiting agent is introduced in the preparation process, superfine nano calcium sulfate particles formed by the ammonium sulfate and the calcium hydroxide are prevented from growing up in a liquid-phase environment, so that industrial production of a superfine nano calcium sulfate product by adopting a chemical method becomes a possibility.

Description

Technical field: [0001] The invention relates to the field of chemical industry, in particular to a technology for preparing nano calcium sulfate by using lime and ammonium sulfate as raw materials. The inventive technology is specially developed for the recycling of ammonium sulfate discharged from the process of preparing iron oxide pigments by using ferrous sulfate. technical background: [0002] The main problem of using ferrous sulfate to prepare iron oxide series pigments is that a large amount of industrial alkali is used to neutralize the acid in the process, and the ammonium sulfate formed is difficult to recycle and has low added value, which makes the production cost high and cannot be industrialized. [0003] Ammonium sulfate and lime are used to react the ammonia in the recovery system to realize the recycling of ammonia, and the gypsum calcium sulfate formed has little use value. [0004] Create a new ammonium sulfate recycling process technology, and realize ...

Claims

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Application Information

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IPC IPC(8): C01F11/46B82B3/00
Inventor 陈胜明
Owner 陈胜明
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