Process for preparing nanometer 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 incapable of industrial production, low added value, and no use value of gypsum calcium sulfate, and achieve the effect of reducing preparation cost and preparation cost

Inactive Publication Date: 2010-09-22
HUNAN HENGGUANG TECH
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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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  • Process for preparing nanometer calcium sulfate
  • Process for preparing nanometer calcium sulfate

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Embodiment Construction

[0032] 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%.

[0033] 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%.

[0034] 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.

[0035] 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.

[0036] 4. Take 1886 kg of ammonium sulfate solution with a concentration of 25%, add it into the calcium hydroxide slurry containing the resistive agent, stir at room temperature for 2 hours, and the reaction is completed to obtain the nanometer calc...

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Abstract

The invention discloses a process for preparing nanometer calcium sulfate. In the method, lime and ammonium sulfate are used as raw materials, and the production process comprises the following steps of: emulsifying the lime, generating nanometer calcium sulfate pulp by a reaction between change-inhibiting agent-containing calcium hydroxide emulsion and solution of ammonium sulfate, filtering and water-washing, drying and the like. The technology is suitable to be used for the recovery of the solution of ammonium sulfate and cyclic utilization of ammonia in a process of producing iron oxide series dyes by using ferrous sulfate as a raw material, and is the key technology used in the process of producing the iron oxide series dyes by using the ferrous sulfate as the raw material. In the preparation process, because the change-inhibiting agent is added, superfine nanometer calcium sulfate particles formed by the ammonium sulfate and the calcium hydroxide are avoided growing in a liquid-phase environment, and the industrialized production of the superfine nanometer calcium sulfate products prepared by a chemical method is made possible.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46B82B3/00
Inventor 曾维兴
Owner HUNAN HENGGUANG TECH
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