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Method for preventing scabbing of pre-liming tank in distillation process in soda ash production by ammonia-soda process

A technology of pre-ash bucket and ammonia-alkali method, which is applied in the direction of carbonate preparations, can solve problems such as production fluctuations, increase maintenance costs, and reduce system production capacity, so as to eliminate surface tension, improve utilization efficiency, and reduce consumption Effect

Active Publication Date: 2020-09-18
山东海天生物化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stopping the tower for inspection and maintenance of the pre-ash bucket will reduce the production capacity of the system, and at the same time lead to production fluctuations and increase inspection and maintenance costs

Method used

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  • Method for preventing scabbing of pre-liming tank in distillation process in soda ash production by ammonia-soda process
  • Method for preventing scabbing of pre-liming tank in distillation process in soda ash production by ammonia-soda process
  • Method for preventing scabbing of pre-liming tank in distillation process in soda ash production by ammonia-soda process

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A method for preventing scabbing of the pre-ash tank in the ammonia-soda method of soda ash production. A return pipe is installed on the side of the pre-ash tank near the bottom, and the blended liquid mixed with milk of lime and preheated mother liquor passes through the pre-ash tank in the return pump. Under the action of the return pipe, the turbid liquid from the upper part of the pre-ash bucket flows back into the pipe into the inside of the pre-ash bucket (the return flow of the blended liquid is 360m 3 / h). Wherein the outlet center line of the return pipe is 12-15cm away from the bottom of the pre-ash bucket, and the diameter of the return pipe is 18-22cm.

[0026] Wherein the pre-ash bucket includes a bucket body, the upper side of the bucket body is provided with a turbid liquid return inlet pipe, the distance between the center line of the turbid liquid return inlet pipe and the top of the barrel body is 300cm, The distance between the internal liquid surfa...

Embodiment 2

[0029] A method for preventing the scabbing of the pre-lime bucket in the distillation process in the production of soda ash by the ammonia-soda method. The blended liquid mixed with milk of lime and preheated mother liquor after being stirred in the pre-ash tank enters the separator, and the turbid liquid at the bottom after being separated by the separator passes through the reflux pump (return volume is 370m 3 / h) The turbid liquid from the upper part of the pre-ash tank is refluxed into the inside of the pre-ash tank, and the supernatant liquid separated by the separator enters the distillation tower.

[0030]The separator includes a body made of carbon steel. The body includes a straight barrel section and a cone section that are connected to each other. The height ratio of the straight barrel section and the cone section is 2:3; the top center of the straight barrel section is provided with an upper Clear liquid outlet, the upper side of the straight barrel section is pr...

Embodiment 3

[0034] A method for preventing the scabbing of the pre-lime bucket in the distillation process in the production of soda ash by the ammonia-soda method. The blended liquid mixed with milk of lime and preheated mother liquor after being stirred in the pre-ash tank enters the separator, and the turbid liquid at the bottom after being separated by the separator passes through the reflux pump (return volume is 370m 3 / h) The turbid liquid from the upper part of the pre-ash tank is refluxed into the inside of the pre-ash tank, and the supernatant liquid separated by the separator enters the distillation tower.

[0035] The separator includes a body made of carbon steel. The body includes a straight barrel section and a cone section that are connected to each other. The height ratio of the straight barrel section and the cone section is 2:3; the top center of the straight barrel section is provided with an upper Clear liquid outlet, the upper side of the straight barrel section is p...

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Abstract

The invention relates to the technical field of soda ash production, and especially relates to a method for preventing the scabbing of a pre-liming tank in the distillation process in soda ash production by an ammonia-soda process. A return pipe is arranged on one side close to the bottom of a pre-liming tank. Lime milk and preheated mother liquor are stirred and mixed in the pre-liming tank to form blending liquid, which enters the pre-liming tank from a turbid liquid return pipe arranged at the upper part of the pre-liming tank through the return pipe. The method can prevent the pre-liming tank from scabbing, continuous and stable operation of the pre-liming tank is realized, the stability and continuity of a whole sodium carbonate production system are improved, the environmental protection risk is reduced, the equipment utilization rate is improved, the productivity is improved, and thus the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of soda ash production, in particular to a method for preventing scabbing of pre-ash buckets in the distillation process in the production of soda ash by ammonia-soda method. Background technique [0002] Ammonia-soda soda ash production enterprises generally use sea salt and limestone as raw materials for soda production, and sea salt contains about Ca 2+ 0.29%, Mg 2+ 0.12%, SO 4 2- 0.95%. At the same time, in order to save fresh water resources, manufacturers often use seawater as salt water. Seawater contains about Ca 2+ 0.63tt, Mg 2+ 1.89tt, SO 4 2- 0.91tt. At present, in order to recover the ammonia in the preheated mother liquor in the ammonia-soda method soda ash production process, the milk of lime and the preheated mother liquor are heated in the distillation process (the preheated mother liquor refers to the carbonized mother liquor is heated twice through the mother liquor combined tower in...

Claims

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Application Information

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IPC IPC(8): C01D7/18
CPCC01D7/18
Inventor 丁思颂王军民郭常伟
Owner 山东海天生物化工有限公司
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