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Process for the production of sodium sulfide with an iron content below 30 ppm

A production method, low-iron sodium sulfide technology, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc.

Active Publication Date: 2011-12-07
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the invention is to provide a method for producing sodium sulfide with an iron content lower than 30ppm, to solve the problem of using zinc salt or barium sulfide to remove iron in the existing domestic production of low iron The process of sodium sulfide is long and pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 1L of cationic polyacrylamide (molecular weight: 5 million) with a mass percentage concentration of 0.1% and mix it with 100L of sodium sulfide clear solution, heat and stir at 50°C for 30 minutes, stirring at a speed of 10r / min, and filter through a plate frame to remove ferrous sulfide cement to obtain sodium sulfide Low-iron sodium sulfide clear liquid with a content of 312g / L; put the low-iron sodium sulfide clear liquid into a stainless steel plate type falling film evaporator (existing equipment) to evaporate, when the low-iron sodium sulfide clear liquid evaporates to a content of 600g / L The concentrated brine is put into a drum slicer for cooling and slicing. The sodium sulfide finished product is tested to have a sodium sulfide content of 60% and an iron content of 25PPm. Process parameters of plate evaporator: steam pressure 0.38Mpa, evaporation temperature 128℃, vacuum degree 0.05Mpa. The main components of sodium sulfide in the sodium sulfide liquid and...

Embodiment 2

[0028] Take 1L of cationic polyacrylamide (molecular weight: 6 million) with a mass percentage concentration of 0.1% and mix it with 200L of clear liquid with a sodium sulfide content of 275.275g / L, heat and stir at 60°C for 60 minutes at a stirring speed of 15r / min, and remove it by plate and frame filtration. 175L of low-iron sodium sulfide clear liquid was obtained from ferrous sulfide cement. Put the low-iron sodium sulfide clear liquid into the stainless steel plate type falling film evaporator (existing equipment) to evaporate to the concentrated brine with a content of 610g / L, then put it into the drum type The slicing machine was passed through water to cool the slices, and the sodium sulfide finished product was tested to have a sodium sulfide content of 61% and an iron content of 30PPm. Plate evaporator technical parameters: steam pressure 0.4Mpa, evaporation temperature 130 ℃, vacuum degree 0.06Mpa. The main components of sodium sulfide in the sodium sulfide liquid ...

Embodiment 3

[0032] Take 1L of cationic polyacrylamide (molecular weight: 8 million) with a mass percentage concentration of 0.2% and mix it with 300L of sodium sulfide clear liquid, heat and stir at 55°C for 90 minutes at a stirring speed of 20r / min, remove ferrous sulfide cement through plate and frame filtration, and obtain low Iron sodium sulfide clear liquid 285L; when the low-iron sodium sulfide clear liquid is poured into a stainless steel plate type falling film evaporator (existing equipment) to evaporate to a concentrated brine with a content of 620g / L, put it into a drum slicer for cooling, Cut into slices; the sodium sulfide finished product is tested to have a sodium sulfide content of 62% and an iron content of 23PPm. Main process parameters of stainless steel plate falling film evaporator: steam pressure 0.38Mpa, evaporation temperature 128℃, vacuum degree 0.07Mpa. The main components of sodium sulfide in the sodium sulfide liquid and the sodium sulfide finished product are ...

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PUM

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Abstract

The invention discloses a production method of sodium sulfide with an iron content of less than 30 ppm so as to solve the present domestic problems of long process flow and environment pollution caused by producing low-iron sodium sulfide by removing iron from zinc salts or barium sulfide. The invention comprises the following steps: mixing a cationic polyacrylamide aqueous solution, which has a mass percent concentration of 0.1%-0.2% and is used as a flocculant, and a sodium sulfide clear liquid with a volume ratio of 1:100-300; stirring for 30-90 minutes under a condition with an insulated temperature of 50 DEG C-60 DEG C; filtering by a plate and frame filter to remove ferrous sulfide daub so as to obtain a low-iron sodium sulfide clear liquid, evaporating the liquid to obtain a sodiumsulfide content of 600 g / L-620 g / L, performing cooling and slicing in a drum-type slicer so as to obtain a sodium sulfide finished product with an iron content of less than 30 PPm and a content of 60%-62%. The method of the invention is applicable to any sodium sulfide production line. The invention has the characteristics of simple process, high production efficiency, less steam consumption, cleanness, environmental protection, etc.

Description

technical field [0001] The invention belongs to the field of sodium sulfide production, in particular to a method for producing sodium sulfide with an iron content lower than 30 ppm. Background technique [0002] In the production process of sodium sulfide, the entry of iron mainly occurs in the following processes: (1) heating process of crude sodium sulfide (280g / L~310g / L sodium sulfide suspension). (2) Sodium sulfide supernatant evaporation process. At present, the evaporation equipment has been a stainless steel plate evaporator, which solves the problem of iron entering in the evaporation process. Sodium sulfide clear liquid sedimentation iron removal is a very important key process in the sodium sulfide iron removal process. The current sodium sulfide suspension settles for 24 hours, and the iron content in the existing sodium sulfide finished product can be controlled at about 70PPm~150PPm. [0003] According to the research results of the "Mechanism of Sodium Sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/36
Inventor 张忠元毛雪琴武平朱丹
Owner GANSU JINSHI CHEM