阅读说明：本技术 一种含有机物的氯化钙废液的处理方法 (Treatment method of calcium chloride waste liquid containing organic matters ) 是由 李秉正 吴汕 李�一 罗建军 武爽 于 2020-05-22 设计创作，主要内容包括：本发明公开了一种含有机物的氯化钙废液的处理方法,包括如下步骤：S1,向含有机物的氯化钙废液中加入硫酸钠进行沉淀反应生成硫酸钙和氯化钠,废液中的氯化钙与硫酸钠的物质的量比为1.05～1.1：1；S2,沉淀反应后向废液中加入过量碳酸钠,静止澄清,固液分离,得到沉降固体和不含固体的水溶液；S3,沉降固体经洗涤,压滤,得到硫酸钙产品；向不含固体的水溶液中加入盐酸,调节pH至6.8～7.2,然后蒸发结晶得到含有机物的固体盐,采用自蔓延热解焚烧工艺去除固体盐中的有机物,得到氯化钠产品。其能够有效去除废液中的有机物,实现产物的资源化利用,降低处理难度,可靠性好。(The invention discloses a method for treating calcium chloride waste liquid containing organic matters, which comprises the following steps: s1, adding sodium sulfate into the organic matter-containing calcium chloride waste liquid to perform precipitation reaction to generate calcium sulfate and sodium chloride, wherein the mass ratio of the calcium chloride to the sodium sulfate in the waste liquid is 1.05-1.1: 1; s2, adding excessive sodium carbonate into the waste liquid after the precipitation reaction, standing for clarification, and performing solid-liquid separation to obtain a precipitated solid and a solid-free aqueous solution; s3, washing and filter-pressing the settled solids to obtain a calcium sulfate product; adding hydrochloric acid into the solid-free aqueous solution, adjusting the pH value to 6.8-7.2, then evaporating and crystallizing to obtain solid salt containing organic matters, and removing the organic matters in the solid salt by adopting a self-propagating pyrolysis incineration process to obtain a sodium chloride product. The method can effectively remove organic matters in the waste liquid, realize the resource utilization of products, reduce the treatment difficulty and have good reliability.)

1. A method for treating calcium chloride waste liquid containing organic matters is characterized by comprising the following steps:

s1, adding sodium sulfate into the organic matter-containing calcium chloride waste liquid to perform precipitation reaction to generate calcium sulfate and sodium chloride, wherein the mass ratio of the calcium chloride to the sodium sulfate in the waste liquid is (1.05-1): 1;

s2, adding excessive sodium carbonate into the waste liquid after the precipitation reaction, standing for clarification, and performing solid-liquid separation to obtain a precipitated solid and a solid-free aqueous solution;

s3, washing and filter-pressing the settled solids to obtain a calcium sulfate product;

adding hydrochloric acid into the solid-free aqueous solution, adjusting the pH value to 6.8-7.2, then evaporating and crystallizing to obtain solid salt containing organic matters, and removing the organic matters in the solid salt by adopting a self-propagating pyrolysis incineration process to obtain a sodium chloride product.

2. The method for treating a calcium chloride waste liquid containing organic substances according to claim 1, wherein: adding calcium sulfate powder while adding sodium sulfate in the S1, wherein the mass ratio of the calcium sulfate powder to the sodium sulfate is 1: 1000.

3. the method for treating a calcium chloride waste liquid containing organic matters according to claim 2, characterized in that: the calcium sulfate powder is prepared by crushing the calcium sulfate product obtained in S3.

4. The method for treating a calcium chloride waste liquid containing organic matters according to claim 2, characterized in that: the particle size of the calcium sulfate powder is not more than 200 meshes.

5. The method for treating a calcium chloride waste liquid containing organic matters according to claim 1 or 2, characterized in that: and the filter pressing in the S3 is plate-frame filter pressing, van-type filter pressing or diaphragm filter pressing.

6. The method for treating a calcium chloride waste liquid containing organic matters according to claim 1 or 2, characterized in that: and washing settled solids in the S3 by adopting a multi-stage countercurrent water washing mode.

Technical Field

The invention relates to the technical field of waste liquid treatment, in particular to a method for treating calcium chloride waste liquid containing organic matters.

Background

The calcium chloride waste liquid is mainly from the production processes of propylene oxide, epichlorohydrin and the like by adopting a calcium saponification process, and is mainly characterized in that calcium hydroxide is added in the process to neutralize hydrochloric acid generated in the process, and finally, waste water with high salt content and organic matters is generated.

Calcium content in the calcium chloride waste liquid is large, and if a conventional evaporation crystallization mode is adopted, calcium chloride is evaporated out in a solid salt form, so that scaling of evaporation equipment can be caused, pipelines are blocked, and evaporation cannot be effectively carried out. In the actual production process, the operation of the equipment is seriously influenced by the blockage of the pipeline, and the overhauling process is very complicated. Meanwhile, calcium chloride is used as a byproduct, so that the usage is less, the requirement on the quality of the byproduct is higher, and the problem of rear-end product outlet is also brought.

And the calcium chloride waste liquid contains a certain amount of organic matters, the existence of the organic matters increases the treatment difficulty and the treatment cost of the calcium chloride waste liquid, and is not beneficial to the resource utilization of subsequent byproducts.

Disclosure of Invention

The invention aims to provide a method for treating calcium chloride waste liquid containing organic matters, which can effectively remove the organic matters in the waste liquid, realize the resource utilization of products, reduce the treatment difficulty and have good reliability.

The method for treating the calcium chloride waste liquid containing the organic matters comprises the following steps:

s1, adding sodium sulfate into the organic matter-containing calcium chloride waste liquid to perform precipitation reaction to generate calcium sulfate and sodium chloride, wherein the mass ratio of the calcium chloride to the sodium sulfate in the waste liquid is 1.05-1.1: 1;

s2, adding excessive sodium carbonate into the waste liquid after the precipitation reaction, standing for clarification, and performing solid-liquid separation to obtain a precipitated solid and a solid-free aqueous solution;

s3, washing and filter-pressing the settled solids to obtain a calcium sulfate product;

adding hydrochloric acid into the solid-free aqueous solution, adjusting the pH value to 6.8-7.2, then evaporating and crystallizing to obtain solid salt containing organic matters, and removing the organic matters in the solid salt by adopting a self-propagating pyrolysis incineration process to obtain a sodium chloride product.

Further, calcium sulfate powder is added at the same time of adding sodium sulfate in the S1, and the mass ratio of the calcium sulfate powder to the sodium sulfate is 1: 1000.

further, the calcium sulfate powder is obtained by crushing the calcium sulfate product obtained in S3.

Further, the particle size of the calcium sulfate powder is not more than 200 meshes.

Further, the filter pressing in the S3 is plate-frame filter pressing, box-type filter pressing or diaphragm filter pressing.

Further, in the step S3, the settled solids are washed by a multi-stage counter-current water washing method.

Compared with the prior art, the invention has the following beneficial effects.

1. According to the invention, sodium sulfate is added into the waste calcium chloride liquid containing organic matters, so that calcium chloride in the waste liquid reacts with the sodium sulfate to generate calcium sulfate precipitate and sodium chloride solution. And washing and filter-pressing the calcium sulfate precipitate generated by the reaction to obtain a calcium sulfate product, evaporating and crystallizing the sodium chloride solution generated by the reaction to obtain solid salt containing organic matters, and removing the organic matters in the solid salt by adopting a self-propagating pyrolysis incineration process to obtain the sodium chloride product. Organic matters in the waste liquid are effectively removed through the self-propagating pyrolysis incineration process, the obtained calcium sulfate product and sodium chloride product can be directly used as other industrial raw materials, and the resource utilization of byproducts is realized. The treatment condition is mild, the treatment difficulty is reduced, and the reliability is good.

2. According to the invention, the calcium sulfate powder is added while the sodium sulfate is added, so that the precipitation reaction speed is promoted, and the treatment efficiency is improved. And the calcium sulfate powder is prepared by crushing the obtained calcium sulfate product, so that the recycling of byproducts is realized, and the production and manufacturing cost is saved.

3. The invention adopts the self-propagating pyrolysis incineration process to remove the organic matters in the solid salt, and other metal ions and organic matters which are difficult to degrade are not introduced in the treatment process, thereby ensuring the purity of the sodium chloride product.

Drawings

FIG. 1 is a schematic process flow diagram of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.