Calcium chloride solution producing method

Abstract

The invention discloses a calcium chloride solution producing method and belongs to the technical field of comprehensive carbide slag utilization and calcium chloride solution production. The calcium chloride solution producing method comprises the steps of pouring limestone into a reaction tank, adding excessive hydrochloric acid to perform steeping reaction, wherein the hydrochloric acid is industrial hydrochloric acid or waste hydrochloric acid, and the mass concentration of hydrogen chloride is 25%-31%; introducing produced acid mist during limestone and hydrochloric acid reaction into an absorption tower to be reacted with a carbide slag solution and re-feeding the calcium chloride solution obtained through reaction and absorption into the reaction tank; then adding the carbide slag solution into the reaction tank to adjust a pH value to be 7-9, performing filtration and clarification through a plate-and-frame filter press to obtain a calcium chloride solution product with mass concentration ranging from 25% to 32%. By means of the calcium chloride solution producing method, carbide slag waste resources are reasonably utilized, the concentration of the produced calcium chloride is high, cost is low, and the method is suitable for large-area popularization and application.

Description

technical field [0001] The invention relates to the comprehensive utilization of calcium carbide slag, in particular to a method for producing calcium chloride solution with calcium carbide slag. Background technique [0002] Calcium carbide CaC 2 In the process of producing acetylene gas by hydrolysis, a large amount of calcium carbide slurry is produced, and its main component is Ca(OH) 2 In addition, it also contains oxides and hydroxides of metals such as magnesium, silicon, aluminum, and iron, as well as a small amount of sulfide, phosphide, and dissolved acetylene gas. Because the water content of calcium carbide slag is as high as 90%, even if the CaCl produced after adding hydrochloric acid 2 The concentration is only 5% to 8%, which can only be used for spraying in ironworks, and the production and transportation costs of this process are high, so that the cost performance of carbide slag utilization is low. [0003] According to the actual production calculation...

AI Technical Summary

Problems solved by technology

The non-comprehensive utilization of calcium carbide slag is a waste of resources, and open-air stacking will occupy a large amount of land resources, and landfill treatment will cause water and soil pollution

[0004] In the production process of vanadium products factory, 15% calcium chloride solution needs to be used to remove phosphorus before vanadium precipitation. This process generally uses purchased solid calcium chloride, adds water and steam to dissolve, and artificially prepares it to a suitable concentration before using it. The efficiency is low and The labor intensity is high, and there is still uneven dissolution, and small particles of solid calcium chloride are mixed into the system, reducing the extraction rate of vanadium

According to estimates, the production cost of using solid calcium chloride is higher than that of directly using calcium chloride solution

[0005] If solid calcium chloride is used for spraying in ironworks, it is necessary to increase the solid calcium chloride dissolution process. If calcium carbide slurry is used to directly add acid-neutralized calcium chloride, there are also inconveniences such as high transportation costs.