Different production processes of soda ash have different purity. At present, there are mainly two methods: combined alkali method and ammonia-alkali method, and the cost of ammonia-alkali method is higher. Soda soda ash is a basic chemical product, which has a wide range of uses and a large amount. It is an important raw material for glass, soap, detergent, textile, tanning, spices, dyes, medicine and so on. The others are not clear. Now many soda enterprises are losing money, such as Qingdao soda industry, which loses more than 200 million yuan every year.