Soda ash futures price chart overall upward trend, less volatile. The current domestic soda ash market is light and finishing, and the market trading atmosphere is weak. At present, light soda ash is quoted at RMB 2,600-2,800/ton by each individual enterprise in central China. Heavy alkali quotes 2800-3000 yuan/ton. North China first-line alkali plant light alkali mainstream offer 3100-3200 yuan / ton, heavy alkali delivered to 3300-3400 yuan / ton. Southwest China around the light alkali mainstream offer 3200-3400 yuan / ton, heavy alkali delivered to 3500 yuan / ton; East China light alkali mainstream offer 2800-3200 yuan / ton, heavy alkali offer 3000-3400; Northwest market around the light alkali mainstream offer light alkali 2800-3000 yuan / ton, heavy alkali offer 3000-3200 yuan / ton.

The concept of soda ash

1, soda ash (Soda Ash), also known as soda, soda ash, lye noodles or washing soda, the composition of sodium carbonate, the molecular formula for Na2CO3, molecular weight of 105.99.

2, sodium carbonate at room temperature for the white odorless powder or particles, with a water-absorbent, exposed in the air to gradually absorb water, it will form lumps. Sodium carbonate is soluble in water and glycerol, slightly soluble in anhydrous ethanol, 35.4 ℃ when the maximum solubility, every 100 grams of water can dissolve 49.7 grams of sodium carbonate.

3, sodium carbonate belongs to the sodium salt, ionization in aqueous solution produces hydroxide ions, aqueous solution is alkaline (pH = 11.6). Sodium carbonate has a certain degree of corrosiveness, strong stability, but can also be decomposed at high temperatures to produce sodium oxide and carbon dioxide. Long-term exposure to air will absorb water and carbon dioxide, generating sodium bicarbonate (baking soda).

4, sodium carbonate can be respectively with acid, salt, alkali chemical reaction: and acid can occur with the decomposition reaction, such as hydrochloric acid in sufficient quantities, the generation of sodium chloride and carbonic acid, unstable carbonic acid is immediately decomposed into carbon dioxide and water, sodium carbonate and other types of acids can also occur similar reactions; and salt decomposition reaction can occur, for example, some calcium salts, barium salts and sodium carbonate to generate precipitates and new sodium salts; and sodium carbonate with calcium hydroxide, calcium hydroxide, barium hydroxide, etc. Calcium hydroxide, barium hydroxide and other bases can occur complex decomposition reaction to produce a precipitate and sodium hydroxide, the industry will use this reaction to prepare caustic soda (sodium hydroxide), commonly known as causticizing method.

Classification of soda ash

1, according to the different density, soda ash is mainly divided into light soda ash (referred to as light soda ash) and heavy soda ash (referred to as heavy soda ash), its chemical composition is sodium carbonate, but the physical form is different: the density of light soda ash is 500- 600kg / m_, white crystalline powder; heavy soda ash density of 1000-1200kg / m_, white tiny It is white and fine granular. Compared with light alkali, heavy alkali has solid, large particles, high density, low moisture absorption, not easy to caking, not easy to fly, good mobility and so on. In addition, there are also super-light soda ash and super-heavy soda ash with densities of about 370kg/m_ and 1550-2553kg/m_ respectively.

2, according to the different uses, soda ash can be divided into industrial soda ash and edible soda ash. Industrial soda ash executes GB/T 210- 2004 "Industrial Sodium Carbonate and Its Test Methods" ( hereinafter referred to as the national standard) standard, edible soda ash executes GB 1886 - 1992 "Food Additives Sodium Carbonate" standard, which increases the limit of the content of arsenic and heavy metals on the basis of reaching the low-salt alkali standard of industrial soda ash.

3, according to the different chloride content, soda ash can be divided into ordinary alkali, low-salt alkali, ultra-low-salt alkali, special low-salt alkali. The mass fraction of sodium chloride of ordinary alkali ≤ 1.20%; the mass fraction of sodium chloride of low saline ≤ 0.90%; the mass fraction of sodium chloride of ultra-low saline ≤ 0.70%; the mass fraction of sodium chloride of special low saline ≤ 0.30%.