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A method for preparing columnar gypsum with sulfur iron slag and filtrate treatment

A treatment method, technology of sulfur iron slag, applied in the field of gypsum in rubber, plastic, construction and paint, can solve the problems of filtrate pollution, etc., and achieve the effect of high added value, simple process and high strength

Inactive Publication Date: 2017-08-08
SOUTHWEAT UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can also solve the filtrate pollution in the production process

Method used

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  • A method for preparing columnar gypsum with sulfur iron slag and filtrate treatment
  • A method for preparing columnar gypsum with sulfur iron slag and filtrate treatment

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Embodiment Construction

[0014] A kind of method that the present invention prepares columnar gypsum with sulfur iron slag, comprises:

[0015] A. Separation of sulfur and iron Add water, surface modifier and decomposer to the sulfur iron slag, heat and stir at 60°C for 2 hours, then add sulfuric acid to obtain calcium sulfate precipitate and iron sulfate solution, which are separated by filtration.

[0016] Table 1: Separation of sulfur and iron (unit: g)

[0017]

[0018] Note: The concentration of sulfuric acid is 40%, and the amount added is according to H 2 SO 4 Calculated, the addition amount can completely convert iron into ferric sulfate.

[0019] Table 2: Preparation of columnar gypsum (unit: g)

[0020]

[0021] Note: The raw material for the preparation of columnar gypsum is calcium sulfate produced by the decomposition of 100g of sulfur iron slag.

[0022] Regeneration treatment of C filtrate

[0023] Add a precipitating agent to the filtrate to obtain a precipitated product, an...

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Abstract

The invention discloses columnar gypsum prepared from pyrite cinder and a filtrate treatment method; the columnar gypsum is prepared by the steps: adding water, a surface modifier and a decomposition agent in the pyrite cinder, decomposing the pyrite cinder, adding sulfuric acid into the decomposed product, and separating sulfur and iron; adding a sulfur-containing precipitate into a flask with a condensation reflux device, then adding an impurity shielding agent and a morphology growth control agent, carrying out a heating reaction, filtering, washing and drying to obtain the columnar gypsum; and adding a precipitant in the filtrate, and wherein the filtrate after filtration can be recycled. The columnar gypsum has the characteristics of resource recycling, simple process and low cost, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to gypsum, in particular to a method for making gypsum used in construction, plastics, rubber and coatings by using sulfur iron slag as raw material. Background technique [0002] In the past ten years, my country's lead-zinc metallurgy has maintained a momentum of rapid growth. In 2010, the total output of lead-zinc reached 9.581 million tons. For the wet process raw electricity zinc plant with an annual output of 100,000 tons, if the zinc concentrate contains 8% iron, the pyrite slag (the molecular formula of the main component is: (NH 4 ) 2 Fe 6 (SO 4 ) 4 (OH) 12 ) is about 53,000 tons, which are usually stored in nearby slag yards, which not only takes up valuable land resources, but also heavy metals in pyrite slag, such as Zn, Cu, Cd, Pb, As and Sb, etc. It will continue to dissolve and pollute groundwater and soil [Chen Yongming, Tang Motang, Yang Shenghai, etc. NaOH decomposition of indium-containing ferroinite slag ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C01G49/14
CPCC01F11/46C01G49/14
Inventor 谭宏斌贺小春董发勤何平徐忠慧
Owner SOUTHWEAT UNIV OF SCI & TECH