Purchasing guides of soda ash
1. Define your needs
According to their own production needs and application scenarios, determine the type, quality requirements and quantity of soda ash required.
2. Select a supplier
Considering the supplier's enterprise scale, production process, product quality, price and after-sales service and other factors, choose the right supplier. It can be selected through field visits, consultation with industry experts, and reference to customer evaluations.
3. Sign a contract
Before signing the purchase contract, it is necessary to clarify the quality standard, price, delivery time, after-sales service and other terms of the product to protect its own rights and interests.
How to solve the problem of high efficiency utilization
1. Optimize the production process
By improving the production process, the reaction efficiency and conversion rate of soda ash are increased, and the production cost is reduced. For example, the use of advanced carbonation technology, optimize crystallization process, etc.
2. Rational use of soda ash
When using soda ash, it is necessary to reasonably control the dosage according to different application scenarios and needs. Avoid waste and improve the efficiency of soda ash.
3. Recycle
For some specific industries, such as the glass industry, recycling soda ash can be considered to reduce production costs and reduce environmental pollution.
In short, soda ash, as an important inorganic chemical raw material, plays an important role in many industries. Understanding the meaning, classification, application scenario, market demand and trend of soda ash, as well as mastering product evaluation, supplier comparison and purchase guide, is of great significance for enterprises and individuals in the production, procurement and use of soda ash. At the same time, continuous exploration of the improvement of soda ash production methods and the solution of efficient utilization problems will help promote the sustainable development of soda ash industry.
The difference between soda ash and soda ash dense
Soda ash can be divided into light alkali and heavy alkali, the main difference is its physical properties, such as loose density, particle size, shape and so on;
The density is different: the density of light soda ash is usually 500~600 kg/cubic meter, and the density of heavy soda ash is 1000~1200 kg/cubic meter.
The preparation process is different: light soda ash is mainly produced by ammonia-alkali method, raw salt and limestone as raw materials, through chemical synthesis to produce light soda ash, and then through solid phase water to produce heavy soda ash;
Heavy soda ash can be produced by natural alkali process, with trona as raw material, through evaporation or carbonization to produce heavy soda ash, or from light alkali through water method or extrusion method. It can also be prepared by ammonia alkali process and combined alkali process;
The price is different: due to the additional process required for preparation, usually a ton of heavy soda ash is 100.300 yuan more expensive than light soda ash.
Uses: Light soda ash is mostly used in food, smelting, printing and dyeing, chemical industry, medicine, daily chemical washing supplies, glass manufacturing, etc. Heavy soda ash is mostly used in the manufacture of high-grade glass such as flat glass, optical glass, and high-grade utensils.
The main steps of producing soda ash by ammonia-alkali process
1. Ammonia absorption
The first step in the production of soda ash by the ammonia-alkali process is to dissolve ammonia gas in water to form ammonia water. Ammonia can be obtained by high-temperature combustion, ammonium oxide, or ammonium distillation. When ammonia gas is passed into water, the solubility decreases with the increase of temperature. Therefore, in the process of ammonia absorption, the method of pressurizing ammonia at low temperature is generally used to dissolve ammonia, so that the ammonia concentration reaches 25% to 30%.
2. ammonia evaporation
The ammonia water is evaporated to produce a concentrated ammonia water. The evaporation device generally adopts multi-effect evaporator, and the multi-stage evaporation improves the thermal efficiency. In the process of ammonia evaporation, the separated water vapor is cooled by the cooling condenser to form ammonia, which is supplied to the next level of evaporator.
3. limestone digestion
Limestone is reacted with concentrated ammonia water to obtain ammonium bicarbonate. The reaction equation is as follows:
CaCO3 + 2NH3 + H2O → Ca(HCO3)2·2NH3
Limestone digestion needs to be carried out under high temperature and pressure, and it is difficult to obtain products at normal temperature. The ammonium bicarbonate in the reaction product is generally unstable and needs to be heated to dissociate to obtain ammonium hydroxide and carbon dioxide. After dissociation, the product was filtered and separated to obtain ammonium bicarbonate mother liquor.
4. Filtrate treatment
Ammonium bicarbonate mother liquor contains impurities, which need to be removed by filtrate treatment. In the treatment process, asbestos filter cloth or rotary filter is generally used to separate impurities.
5. lye evaporation
The ammonium bicarbonate solution is evaporated through a multistage evaporator to obtain soda ash. Ammonium bicarbonate is first removed from the suspension in a high-speed centrifugal filter, and then evaporated through a multi-stage evaporator, so that the concentration is continuously increased until it reaches a saturated concentration. At saturated concentration, the product has almost no water, to meet the requirements of soda ash. At the same time, during the evaporation process, carbon dioxide is released by heating and pressurizing to produce sodium carbonate.
6. Finished product preparation
After obtaining soda ash, subsequent processing such as powder making, cube making or crystal making can be carried out to make it meet customer needs.
Through the above steps, the ammonia alkali process can produce high purity soda ash. Of course, there are many details to pay attention to in the actual production process, such as equipment selection, operating conditions control, environmental protection and other issues.
However, understanding the main steps in the production of soda ash by the ammonia-alkali process will be a very beneficial thing for those engaged in related industries.
