阅读说明：本技术 一种工业氯化铵的生产工艺 (Production process of industrial ammonium chloride ) 是由 王士雪 燕宁春 于 2020-01-03 设计创作，主要内容包括：本发明公开了一种工业氯化铵的生产工艺,属于氯化铵分离提纯技术领域。本发明通过粗品预处理、多级过滤处理、固体氯化铵制备和成品这四个步骤来实现工业氯化铵的生产。本发明利用多级过滤处理能够实现粗品中杂质去除,能够有效提高氯化铵的质量。本发明氯化铵的质量分数≥99.7%,水分的质量好分数≤0.4,氯化钠、重金属和水不溶物质的质量分数均符合国家标准,pH值为5.1～5.2。本发明中母液的循环利用率为86.3%～87.1%,原料的重复利用率为85%～91.1%,氯化铵的产率高达99.5%～99.7%,对环境无污染,成本低,经济效益显著。(The invention discloses a production process of industrial ammonium chloride, belonging to the technical field of ammonium chloride separation and purification. The invention realizes the production of industrial ammonium chloride by four steps of crude product pretreatment, multistage filtration treatment, solid ammonium chloride preparation and finished product. The method can remove impurities in the crude product by utilizing multi-stage filtration treatment, and can effectively improve the quality of ammonium chloride. The mass fraction of the ammonium chloride is more than or equal to 99.7%, the mass fraction of the water is less than or equal to 0.4, the mass fractions of the sodium chloride, the heavy metals and the water-insoluble substances all meet the national standard, and the pH value is 5.1-5.2. The recycling rate of the mother liquor is 86.3-87.1%, the recycling rate of the raw materials is 85-91.1%, the yield of the ammonium chloride is as high as 99.5-99.7%, the method has no pollution to the environment, the cost is low, and the economic benefit is remarkable.)

1. The production process of industrial ammonium chloride comprises the following steps:

1) pre-treating a crude product: adding the crude ammonium chloride into a dissolving tank, adding deionized water at 50-60 ℃, stirring clockwise, adding an unsaturated ammonium chloride solution, stirring for 8-12 min, dissolving to obtain a saturated ammonium chloride solution, and pumping out;

2) and (3) multistage filtration treatment: the dissolved solution in the step 1) enters a dissolving liquid tank, the dissolved solution is conveyed to a filter for pretreatment for 4-6 times by a conveying pump, impurities are removed, and then multi-stage filtration treatment liquid is obtained;

3) preparation of solid ammonium chloride: step 2) sending the multistage filtration treatment liquid into a filtrate tank, sending the filtrate into a distillation device through a delivery pump, starting a steam valve, sending steam to a heater to heat and evaporate the circulating material, starting a material transfer pump after the boiling point of the solution, adding primary distillation for heating and concentrating, sending the concentrated solution to a secondary distillation device, sending secondary steam generated by the primary distillation device to the heater of the secondary distillation device, sending the separated salt slurry liquid into a thickener for thickening, and sending the salt slurry into a centrifuge I to separate solid ammonium chloride;

4) and (3) finished product: the materials are conveyed to a cooling device through a material transfer pump to be cooled and operated, when the materials are crystallized, the materials are extracted by the pump and separated through a centrifugal machine II, a liquid phase returns to the cooling device, all condensed water recovered condensed water tanks are used for dissolving ammonium chloride crude products, the centrifuged moisture-containing materials are conveyed to a drying procedure to be dried, and moisture-removed finished products are packaged.

2. The production process of industrial ammonium chloride according to claim 1, wherein the stirring speed in the step 1) is 200-300 r/min.

3. The process for producing industrial ammonium chloride according to claim 1, wherein the boiling point of the solution obtained by the secondary distillation in the step 3) is controlled to 90-100 ℃.

4. The process for producing industrial ammonium chloride according to claim 1, wherein the drying time in the step 4) is not less than the cooling time, and the difference between the drying time and the cooling time is 3-5 min.

Technical Field

The invention belongs to the technical field of ammonium chloride separation and purification, and particularly relates to a production process of industrial ammonium chloride.

Background

Ammonium chloride, colorless cubic crystals or white crystals, has low hygroscopicity, but can absorb moisture and agglomerate in humid and rainy days. The aqueous solution is weakly acidic, and the acidity is increased when the solution is heated. It is corrosive to ferrous metal and other metals, especially to copper, and has no corrosive effect on pig iron. The method is mainly used for mineral separation, tanning and agricultural fertilizer. Used as dyeing assistant, electroplating bath additive and metal welding flux. Also used for tin and zinc plating, medicine, candle making, adhesives, chromizing, precision casting and manufacturing dry batteries and accumulators and other ammonium salts. At present, the general method adopted is the Hou's soda process, namely, the waste liquid containing chlorine in the soda production and the carbon dioxide waste gas in the ammonia synthesis process are recycled and utilized to prepare soda ash and ammonium chloride fertilizer, so that the two industries of soda production and ammonium production are combined, and the method is also called as a combined soda process.

The search of the existing literature shows that Chinese patent publication No. CN1197772C, published as 4.20.2005, discloses a method for improving the quality of industrial ammonium chloride products, and the cyclic utilization rate of mother liquor in the patent document is not high enough, the repeated utilization rate of raw materials is not high enough, and the yield of ammonium chloride is not high enough.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the industrial ammonium chloride production process which has high mother liquor recycling rate, high raw material recycling rate and improved ammonium chloride yield.

In order to achieve the purpose, the invention adopts the following technical scheme:

a production process of industrial ammonium chloride comprises the following steps:

1) pre-treating a crude product: adding the crude ammonium chloride into a dissolving tank, adding deionized water at 50-60 ℃, stirring clockwise, adding unsaturated ammonium chloride, dissolving to obtain a saturated ammonium chloride solution, and pumping out;

2) and (3) multistage filtration treatment: the dissolved solution in the step 1) enters a dissolving liquid tank, the dissolved solution is conveyed to a filter for pretreatment for 4-6 times by a conveying pump to remove impurities, and then multiple filtration treatments are carried out to obtain multi-stage filtration treatment solution;

3) preparation of solid ammonium chloride: step 2) sending the multistage filtration treatment liquid into a filtrate tank, sending the filtrate into a distillation device through a delivery pump, starting a steam valve, sending steam to a heater to heat and evaporate the circulating material, starting a material transfer pump after the boiling point of the solution, adding primary distillation for heating and concentrating, sending the concentrated solution to a secondary distillation device, sending secondary steam generated by the primary distillation device to the heater of the secondary distillation device, sending the separated salt slurry liquid into a thickener for thickening, and sending the salt slurry into a centrifuge I to separate solid ammonium chloride;

4) and (3) finished product: the materials are conveyed to a cooling device through a material transfer pump to be cooled and operated, when the materials are crystallized, the materials are extracted by the pump and separated through a centrifugal machine II, a liquid phase returns to the cooling device, all condensed water recovered condensed water tanks are used for dissolving ammonium chloride crude products, the centrifuged moisture-containing materials are conveyed to a drying procedure to be dried, and moisture-removed finished products are packaged.

Further, the stirring speed in the step 1) is 200-300 r/min.

Further, the boiling point of the solution subjected to secondary distillation in the step 3) is controlled to be 90-100 ℃.

Further, the drying time in the step 4) is not less than the cooling time, and the difference between the drying time and the cooling time is 3-5 min.

The invention has the beneficial effects that:

1) the invention can improve the dissolution and transformation of the ammonium chloride crude product by filtering the crude product for multiple times during the treatment.

2) The method can remove impurities in the crude product by utilizing multi-stage filtration treatment, and can effectively improve the yield of ammonium chloride.

3) The mass fraction of the ammonium chloride is more than or equal to 99.7%, the mass fraction of the water is less than or equal to 0.4, the mass fractions of the sodium chloride, the heavy metals and the water-insoluble substances all meet the national standard, and the pH value is 5.1-5.2.

4) The recycling rate of the mother liquor is 86.3-87.1%, the recycling rate of the raw materials is 85-91.1%, the yield of the ammonium chloride is as high as 99.5-99.7%, the method has no pollution to the environment, the cost is low, and the economic benefit is remarkable.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

The components, structures, mechanisms and the like described in the following examples are all conventional commercially available products unless otherwise specified.