Energy-saving production method for layered crystal sodium disilicate

Abstract

The invention relates to an energy-saving process for producing layered crystal sodium disilicate in the field of the process for producing a washing assistant. The process is as follows: (1) the dust content of coal gas is controlled to less than or equal to 50 mg / m<3>, the temperature is controlled to between 30 and 40 DEG C, and the pressure is controlled to between 0.2 and 0.3 MPa; (2) the concentration of a solution is controlled to between 40 and 45 percent, and settled dreg is filtered after dissolution is over; (3) a module adjusting agent is added into the mixture to adjust the mixture to the required module, the mixture is subjected to spray drying and dehydration, and the moisture mass ratio of the produced instant sodium silicate is between 9 and 12 percent; and (4) the temperature of a high-temperature crystal oven is between 600 and 900 DEG C, the gas exhaust temperature is between 500 and 600 DEG C, the crystallization time is kept to between 8 and 15 minutes, and high-temperature crystalline substances which are discharged from the crystal oven are crushed and cooled and the granularity of the high-temperature crystalline substances is controlled to less than 100 meshes. The process adopts the method of replacing high-cost fuel by low-cost fuel to reduce the production cost, utilizes recovery of waste heat of the crystal oven to save the energy and reduce exhaust emission and the cost, and technically reaches the domestic advanced level.

Description

technical field [0001] The invention relates to an energy-saving production process of layered crystalline sodium disilicate in the field of washing aid production process. Background technique [0002] At present, there are two production methods of layered crystalline sodium disilicate, one is high-pressure solution crystallization, and the other is high-temperature sintering crystallization. The advantage of high-pressure solution crystallization is the high purity of the product, but the disadvantages are high investment in equipment, low production efficiency, and difficulty in controlling the degree of crystallization, which is not suitable for industrial production. The high-temperature sintering and crystallization method is to spray-dry the sodium silicate solution with a suitable modulus to make powdery instant powder, and then send it to the crystallization kiln for high-temperature sintering and crystallization to obtain granular layer silicon, which is then crus...

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Problems solved by technology

However, due to the immature production process and technical conditions of most enterprises, and quality problems in the production and manufacturing equipment, especially the crystallization furnace does not have a heat storage device, the waste heat cannot be fully utilized, and energy is seriously wasted. Secondly, the ratio of energy to finished products is very high. High, generally only 2-3 tons of fuel can produce 1 ton of finished products, which causes serious waste of energy, and some non-standard equipment has defects in weld quality during manufacturing, and the insulation and sealing layer is not tight, resulting in temperature distribution in the furnace Unevenness, material sticking to the wall, product powder leakage and other phenomena, so that the produced products cannot be used for pre-mixing of washing powder. At this stage, these production enterprises are in a state of suspension and semi-production.

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