Dephosphorization agent and preparation method thereof

Abstract

The present invention relates to a dephophorization agent and a preparation method thereof. According to the invention, inorganic bentonite is used as a carrier, and one of metallic oxides such as iron, nickel, manganese, zinc, copper, and cerium is used as an active component with alkali metal oxide and alkaline earth metal oxide as auxiliary components, wherein the mass percentage of each component is as following: 5 to 20 percent of active component, 10 to 40 percent of alkaline earth metal oxide, 10 to 25 percent of alkali metal oxide, and the balance of inorganic bentonite. The preparation method provided by the invention includes the following steps: first, adding ammonia water to the active component of soluble metal salt for deposition, and a suspension liquid of the metal is obtained through pulping by adding water; then, adding proportional amounts of calcium oxide, sodium carbonate or sodium bicarbonate as well as bentonite and grinding the mix into a paste, leaving the paste for four hours; drying the paste after molding the paste into a bar, and roasting the same for two hours at the temperature of 300 DEG C to 400 DEG C, then a dephosphorization agent is obtained. The dephosphorization agent is of high strength, and is applicable for desorption of PH3 with low temperature and high phosphorus capacity.

Description

technical field [0001] The invention relates to a dephosphorization agent and a preparation method thereof, more specifically a pH 3 Removed dephosphorization agent and preparation method thereof. Background technique [0002] Phosphorus is a catalyst poison, and the main form of phosphorus in the feed gas is volatile pH 3 , the volatile phosphide can widely exist in various raw material gases, especially in raw material gases such as calcium carbide tail gas and yellow phosphorus tail gas. As we all know, my country is a big producer of calcium carbide. In 2011, the total output of calcium carbide in China reached 17.5 million tons. Calcium carbide furnace produces about 400 m of calcium carbide furnace tail gas for every 1 ton of calcium carbide produced 3 , taking 2011 as an example, a total of 17.5 million tons of calcium carbide furnace tail gas was produced × 400 m 3 / t÷2 = 3.5 billion m 3 , with the increase in output and the further increase in the number of ca...

AI Technical Summary

Problems solved by technology

The preparation method of Chinese patent CN101422737.B special catalyst TP201 for yellow phosphorus tail gas, the catalyst uses activated carbon as a carrier, uses aluminum nitrate, ferrous sulfate, manganese nitrate, calcium nitrate, copper nitrate, potassium nitrate as active impregnating liquid, after impregnating and drying , roasted. The mechanism of the catalyst to remove phosphine is catalytic oxidation, which needs to be operated at a relatively high temperature (70-140 ° C). Since the carrier is activated carbon, there is a risk of fire and combustion in the process of preparation and use.

U.S. Patent US5182088 discloses a chemical adsorbent, which is prepared by adding AgO, HgO, etc. to copper, zinc and other oxides. After calculation, the adsorbent is used to purify pH 3 When the phosphorus content is less than 2%, and the addition of Ag, Hg, etc. causes the cost of the catalyst to be high

[0007] It can be seen that the dephosphorization agents developed at home and abroad basically use activated carbon as the carrier, and the main research objects are all for yellow phosphorus tail gas. risk, and the phosphorus capacity is low, the purification degree is not high, and the cost is high; therefore, it is necessary to develop a new type of PH suitable for raw material gas 3 dephosphorization agent