Method for preparing magnesium carbonate co-produced mixed powder calcium with soda salt mud

A technology of mixing powder and magnesium carbonate, which is applied in the direction of magnesium carbonate, calcium carbonate/strontium/barium, chemical instruments and methods, etc., can solve the problems of unfavorable environmental protection, waste of transportation costs, etc., and achieve simple production process and equipment, Low cost and the effect of eliminating chemical pollution

Inactive Publication Date: 2010-09-08
汪晋强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Then press filter into a cake and transport it away for accumulation, which is not conducive to environmental protection and wastes transportation costs

Method used

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  • Method for preparing magnesium carbonate co-produced mixed powder calcium with soda salt mud
  • Method for preparing magnesium carbonate co-produced mixed powder calcium with soda salt mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for preparing magnesium carbonate co-production mixed powder calcium with soda ash salt mud comprises the following preparation steps:

[0022] Step A, send 800kg of soda ash waste salt mud containing 50% water and 30% magnesium hydroxide to the washing tank 1, first wash off the soluble chloride ion and sulfate ion impurities with water, and then adjust it with water to make the magnesium mud milky After the liquid is sent to the sedimentation tank 2;

[0023] Step B. After the magnesium mud emulsion in the sedimentation tank is separated from the precipitated liquid and solid, the magnesium mud emulsion is sent to the batching tank to add water to make an emulsion, and then sent to the carbonization tower 3 for carbonization. In the carbonization tower, the mass ratio of pure substances is 1 : 1.32 feed carbon dioxide to react, so that most of the magnesium hydroxide in the magnesium mud emulsion is converted into magnesium bicarbonate solution, while calci...

Embodiment 2

[0029] The method for preparing magnesium carbonate co-production mixed powder calcium with soda ash salt mud comprises the following preparation steps:

[0030] Step A, send 800kg of soda ash waste salt mud containing 50% water and 30% magnesium hydroxide to the washing tank 1, first wash off the soluble chloride ion and sulfate ion impurities with water, and then adjust it with water to make the magnesium mud milky After the liquid is sent to the sedimentation tank 2;

[0031] Step B. After the magnesium mud emulsion in the sedimentation tank is separated from the precipitated liquid and solid, the magnesium mud emulsion is sent to the batching tank to add water to make an emulsion, and then sent to the carbonization tower 3 for carbonization. In the carbonization tower, the mass ratio of pure substances is 1 : 1.72 feed carbon dioxide to react, so that most of the magnesium hydroxide in the magnesium mud emulsion is converted into magnesium bicarbonate solution, while calci...

Embodiment 3

[0037] The method for preparing magnesium carbonate co-production mixed powder calcium with soda ash salt mud comprises the following preparation steps:

[0038] Step A, send 800kg of soda ash waste salt mud containing 50% water and 30% magnesium hydroxide to the washing tank 1, first wash off the soluble chloride ion and sulfate ion impurities with water, and then adjust it with water to make the magnesium mud milky After the liquid is sent to the sedimentation tank 2;

[0039] Step B. After the magnesium mud emulsion in the sedimentation tank is separated from the precipitated liquid and solid, the magnesium mud emulsion is sent to the batching tank to add water to make an emulsion, and then sent to the carbonization tower 3 for carbonization. In the carbonization tower, the mass ratio of pure substances is 1 : 1.32 feed carbon dioxide to react, so that most of the magnesium hydroxide in the magnesium mud emulsion is converted into magnesium bicarbonate solution, while calci...

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Abstract

The invention belongs to the technical field of chemical three waste treatment and utilization, particularly relates to a method for preparing magnesium carbonate co-produced mixed powder calcium with soda salt mud; the main technical scheme is as follows: clear filtrate which is obtained after the washing, sedimentation and filtration of the waste soda salt mud is sent into a carbonizer to be carbonized, the obtained clear magnesium bicarbonate solution enters a distiller to be heated, and then sedimentated and filtered to obtain a magnesium carbonate product; and previously, a filter cake is sedimentated, dried, crushed and packaged into the mixed powder calcium product; and the method for preparing magnesium carbonate co-produced mixed powder calcium with soda salt mud not only effectively treats the salt mud in the soda industry and eliminates chemical pollution, but also can transform the waste salt mud into magnesium carbonate and mixed powder calcium with economic value, and has the advantages of simple production process and equipment thereof, and low cost.

Description

technical field [0001] The invention belongs to the technical field of treatment and comprehensive utilization of inorganic chemical wastes, in particular to a method for preparing magnesium carbonate and co-producing mixed powder calcium with soda ash salt mud. technical background [0002] In the process of preparing soda ash by the ammonia-soda method, a certain amount of milk of lime is added to the coarse brine when the brine is refined, so that the magnesium ions in the brine are converted into magnesium hydroxide (commonly known as primary salt mud) and removed, and the clarified brine Carbon dioxide is added to convert calcium ions into calcium carbonate (commonly known as secondary salt mud) and be removed. Because the particles of magnesium hydroxide (primary mud) are extremely small, the sedimentation speed is very slow. In order to accelerate the sedimentation, the secondary salt mud calcium carbonate is mixed as a settling aid, and discharged together with magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C01F5/24C01F11/46C01F11/18B09B3/00
Inventor 王嘉兴
Owner 汪晋强
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