Sodium bicarbonate filtrate thickening process

Abstract

The invention discloses a sodium bicarbonate filtrate thickening process and belongs to the field of chemical industry production. The sodium bicarbonate filtrate thickening process comprises steps asfollows: after a carbonized take-out liquid is separated by a hydrocyclone separator, crystal magma is delivered to a carbonizing take-out tank, a cyclone liquid is delivered to a sodium bicarbonatefiltrate thickener, and the carbonizing take-out tank takes out a finished product to a sodium bicarbonate filter machine; the sodium bicarbonate filter machine sprays washing water to reduce salinityof sodium bicarbonate, separated sodium bicarbonate is delivered to a calcination process, a filtrate of the sodium bicarbonate filter machine is pumped to a vacuum separator by a vacuum pump, separated filtrate flows into the sodium bicarbonate filtrate thickener through a U-shaped water seal, and the cyclone liquid flows into the sodium bicarbonate filtrate thickener after the carbonized take-out liquid passes the hydrocyclone separator; crystal magma is taken out from the lower part of the sodium bicarbonate filtrate thickener and conveyed to the carbonizing take-out tank through a crystalmagma pump, so that the crystal magma enters the sodium bicarbonate filter machine, a clear liquid overflows from the sodium bicarbonate filtrate thickener to a mother solution barrel I and then is pumped to an ammonia absorption procedure by a mother solution pump I. Energy consumption of production is reduced, the production problem caused by too high crystal-carrying amount is solved, and balance of system water of a combined-soda process is guaranteed.

Description

technical field [0001] The invention belongs to the field of chemical production, and more specifically relates to a heavy alkali filtrate thickening process. Background technique [0002] The process flow of the filtration system in the traditional soda ash production process is: after the carbonized liquid is separated by the hydrocyclone, the magma is removed from the carbonized removal tank, the carbonized removal tank is taken out to the soda filter, and the soda filter is sprayed with washing water to reduce the heavy alkali salt content , the separated heavy alkali is sent to the calcination process. The soda filter extracts the filtrate of the soda filter into the vacuum separator through the vacuum pump to realize gas-liquid separation. The separated filtrate flows into the mother liquor I barrel through the U-shaped water seal, and the carbonized liquid overflows after passing through the hydrocyclone. Flow together in the mother liquor I barrel, then pumped by th...

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Problems solved by technology

There are following defects in this technique: 1, the soda filter machine filtrate and the overflow of carbonation cyclone liquid are not thickened again, directly go to the mother I barrel, increase the mother liquor equivalent of entering the soda filter machine, increase the filtration and washing water equivalent, and bring about The expansion of the mother liquor in the alkali system; 2. The high moisture content of the heavy alkali increases the steam consumption in the calcination process; 3. The high crystal content of the filtrate of the alkali filter causes the CO 2 High content, clogging the heat exchanger and affecting production

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