Sodium sulfide solution purification process

A technology of sulfide lye and purification process, which is applied in the direction of alkali metal sulfide/polysulfide, etc. It can solve the problems of polluting environmental products, high labor intensity, and slow settlement speed, so as to shorten the process flow and improve the polluted environment , The effect of improving work efficiency

Inactive Publication Date: 2009-01-28
金贤琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two methods of purifying lye in the production process of soda sulfide: one is to use a settler to settle naturally. The disadvantage is that to prevent the viscosity of the lye from changing, heat preservation and heating are required, the settling speed is slow, the processing capacity is small, and the investment in equipment and civil construction is l

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The alkali sulfide solid clinker to be processed is added 2.2 parts by weight of water according to 1 weight part of raw material, and heat-dissolved at a temperature of 75° C., stirred for 30 minutes during heat-dissolution, and the stirring speed is 20 revolutions per minute to obtain solid alkali sulfide clinker. material suspension;

[0013] The above-mentioned hot-melted alkali sulfide suspension containing sludge is sent into a screw discharge sedimentation centrifuge with a slurry pump to carry out centrifugal rapid sedimentation at a speed of 2000 rpm to obtain a clarified liquid alkali sulfide, and its alkali sulfide (Na2S ) The solid content of the clarified liquid is less than 5%;

[0014] The clarified liquid obtained by centrifugal sedimentation separation is sent to a plate and frame filter press with a filter cloth aperture of 8 microns and filtered at a pressure of 0.6MP and a temperature of 80°C, and the permeate is taken and sent to the evaporation pro...

Embodiment 2

[0016] The alkali sulfide solid clinker to be processed is added 2.3 parts by weight of water to 1 weight part of the raw material, and is melted at a temperature of 85° C., stirred for 35 minutes during the heat melt, and the stirring speed is 40 revolutions per minute to obtain the alkali sulfide solid clinker. material suspension;

[0017] The alkali sulfide suspension containing slag obtained by the above-mentioned thermal melting is sent into a screw discharge sedimentation centrifuge with a slurry pump to carry out centrifugal rapid sedimentation at a speed of 2500 rpm to obtain a clarified liquid alkali sulfide, and its alkali sulfide (Na2S ) The solid content of the clarified liquid is less than 5%; return the settled sludge to the slag washing storage tank and add 2.3 times the weight of clear water for washing, and then send the resulting suspension to the screw discharge sedimentation centrifuge for secondary centrifugal sedimentation , the resulting clarified light...

Embodiment 3

[0020] The alkali sulfide solid clinker to be processed is added 2.15 parts by weight of water according to 1 weight part of raw material, and is melted at a temperature of 80° C., and stirred for 25 minutes during the heat dissolution, and the stirring speed is 30 revolutions per minute to obtain solid alkali sulfide clinker. material suspension;

[0021] The alkali sulfide suspension containing mud slag obtained by the above-mentioned thermal melting is sent to a screw discharge sedimentation centrifuge with a slurry pump to carry out centrifugal rapid sedimentation at a speed of 2800 rpm to obtain a clarified liquid alkali sulfide, and the settled mud The slag is returned to the slag washing storage tank and washed with 2.5 times the weight of clean water, and the resulting suspension is sent to the screw discharge sedimentation centrifuge for secondary centrifugal sedimentation. water;

[0022] Send the first clarified liquid obtained from centrifugal sedimentation separa...

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Abstract

The invention relates to an alkali liquor purification process method in a sodium sulphide production course. The alkali liquor purification process method comprises a thermal dissolution process, a centrifugal settlement and separation process, a filtration process. By adopting the alkali liquor purification process of the invention, equipment can be simplified, in particular, continuous and uninterrupted operation can be realized; the working efficiency is greatly improved, in particular, the product quality is greatly improved; meanwhile, residual alkali in sludge can be fully washed and recovered; the process is shortened, and quantitative automatic switch control can be realized easily on schedule; and the situations of leaking and polluting environment can be reduced.

Description

Technical field: [0001] The invention relates to a process for purifying alkali liquor during the production process of alkali sulfide. Background technique: [0002] In the production process of soda sulfide (Na2S), the calcined clinker directly enters the heating tank for thermal melting, and the solution obtained after thermal melting is a suspension with a large amount of impurities, which needs to be purified before evaporation. At present, there are two methods of purifying lye in the production process of soda sulfide: one is to use a settler to settle naturally. The disadvantage is that to prevent the viscosity of the lye from changing, heat preservation and heating are required, the settling speed is slow, the processing capacity is small, and the investment in equipment and civil construction is large. , Serious corrosion of equipment, affecting product quality. The second is to use a plate and frame filter press for filtration. The disadvantage is that the filter...

Claims

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Application Information

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IPC IPC(8): C01B17/22
Inventor 吴玲华金贤琴
Owner 金贤琴
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